From a22d9c106276bb1819e583012d7ea41b6529b318 Mon Sep 17 00:00:00 2001
From: guowenxue <guowenxue@gmail.com>
Date: Wed, 16 May 2018 08:14:05 +0800
Subject: [PATCH] add new LED key systick sample code
---
src/bare_test/4.Systick/stdlib/src/stm32f10x_i2c.c | 2662 +++++++++++++++++++++++++++++-----------------------------
1 files changed, 1,331 insertions(+), 1,331 deletions(-)
diff --git a/src/bare_test/stm32_key/fwlib/src/stm32f10x_i2c.c b/src/bare_test/4.Systick/stdlib/src/stm32f10x_i2c.c
similarity index 99%
copy from src/bare_test/stm32_key/fwlib/src/stm32f10x_i2c.c
copy to src/bare_test/4.Systick/stdlib/src/stm32f10x_i2c.c
index 8896726..4ea321c 100644
--- a/src/bare_test/stm32_key/fwlib/src/stm32f10x_i2c.c
+++ b/src/bare_test/4.Systick/stdlib/src/stm32f10x_i2c.c
@@ -1,1331 +1,1331 @@
-/**
- ******************************************************************************
- * @file stm32f10x_i2c.c
- * @author MCD Application Team
- * @version V3.5.0
- * @date 11-March-2011
- * @brief This file provides all the I2C firmware functions.
- ******************************************************************************
- * @attention
- *
- * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
- * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
- * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
- * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
- * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
- * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
- *
- * <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2>
- ******************************************************************************
- */
-
-/* Includes ------------------------------------------------------------------*/
-#include "stm32f10x_i2c.h"
-#include "stm32f10x_rcc.h"
-
-
-/** @addtogroup STM32F10x_StdPeriph_Driver
- * @{
- */
-
-/** @defgroup I2C
- * @brief I2C driver modules
- * @{
- */
-
-/** @defgroup I2C_Private_TypesDefinitions
- * @{
- */
-
-/**
- * @}
- */
-
-/** @defgroup I2C_Private_Defines
- * @{
- */
-
-/* I2C SPE mask */
-#define CR1_PE_Set ((uint16_t)0x0001)
-#define CR1_PE_Reset ((uint16_t)0xFFFE)
-
-/* I2C START mask */
-#define CR1_START_Set ((uint16_t)0x0100)
-#define CR1_START_Reset ((uint16_t)0xFEFF)
-
-/* I2C STOP mask */
-#define CR1_STOP_Set ((uint16_t)0x0200)
-#define CR1_STOP_Reset ((uint16_t)0xFDFF)
-
-/* I2C ACK mask */
-#define CR1_ACK_Set ((uint16_t)0x0400)
-#define CR1_ACK_Reset ((uint16_t)0xFBFF)
-
-/* I2C ENGC mask */
-#define CR1_ENGC_Set ((uint16_t)0x0040)
-#define CR1_ENGC_Reset ((uint16_t)0xFFBF)
-
-/* I2C SWRST mask */
-#define CR1_SWRST_Set ((uint16_t)0x8000)
-#define CR1_SWRST_Reset ((uint16_t)0x7FFF)
-
-/* I2C PEC mask */
-#define CR1_PEC_Set ((uint16_t)0x1000)
-#define CR1_PEC_Reset ((uint16_t)0xEFFF)
-
-/* I2C ENPEC mask */
-#define CR1_ENPEC_Set ((uint16_t)0x0020)
-#define CR1_ENPEC_Reset ((uint16_t)0xFFDF)
-
-/* I2C ENARP mask */
-#define CR1_ENARP_Set ((uint16_t)0x0010)
-#define CR1_ENARP_Reset ((uint16_t)0xFFEF)
-
-/* I2C NOSTRETCH mask */
-#define CR1_NOSTRETCH_Set ((uint16_t)0x0080)
-#define CR1_NOSTRETCH_Reset ((uint16_t)0xFF7F)
-
-/* I2C registers Masks */
-#define CR1_CLEAR_Mask ((uint16_t)0xFBF5)
-
-/* I2C DMAEN mask */
-#define CR2_DMAEN_Set ((uint16_t)0x0800)
-#define CR2_DMAEN_Reset ((uint16_t)0xF7FF)
-
-/* I2C LAST mask */
-#define CR2_LAST_Set ((uint16_t)0x1000)
-#define CR2_LAST_Reset ((uint16_t)0xEFFF)
-
-/* I2C FREQ mask */
-#define CR2_FREQ_Reset ((uint16_t)0xFFC0)
-
-/* I2C ADD0 mask */
-#define OAR1_ADD0_Set ((uint16_t)0x0001)
-#define OAR1_ADD0_Reset ((uint16_t)0xFFFE)
-
-/* I2C ENDUAL mask */
-#define OAR2_ENDUAL_Set ((uint16_t)0x0001)
-#define OAR2_ENDUAL_Reset ((uint16_t)0xFFFE)
-
-/* I2C ADD2 mask */
-#define OAR2_ADD2_Reset ((uint16_t)0xFF01)
-
-/* I2C F/S mask */
-#define CCR_FS_Set ((uint16_t)0x8000)
-
-/* I2C CCR mask */
-#define CCR_CCR_Set ((uint16_t)0x0FFF)
-
-/* I2C FLAG mask */
-#define FLAG_Mask ((uint32_t)0x00FFFFFF)
-
-/* I2C Interrupt Enable mask */
-#define ITEN_Mask ((uint32_t)0x07000000)
-
-/**
- * @}
- */
-
-/** @defgroup I2C_Private_Macros
- * @{
- */
-
-/**
- * @}
- */
-
-/** @defgroup I2C_Private_Variables
- * @{
- */
-
-/**
- * @}
- */
-
-/** @defgroup I2C_Private_FunctionPrototypes
- * @{
- */
-
-/**
- * @}
- */
-
-/** @defgroup I2C_Private_Functions
- * @{
- */
-
-/**
- * @brief Deinitializes the I2Cx peripheral registers to their default reset values.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @retval None
- */
-void I2C_DeInit(I2C_TypeDef* I2Cx)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
-
- if (I2Cx == I2C1)
- {
- /* Enable I2C1 reset state */
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
- /* Release I2C1 from reset state */
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
- }
- else
- {
- /* Enable I2C2 reset state */
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
- /* Release I2C2 from reset state */
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
- }
-}
-
-/**
- * @brief Initializes the I2Cx peripheral according to the specified
- * parameters in the I2C_InitStruct.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param I2C_InitStruct: pointer to a I2C_InitTypeDef structure that
- * contains the configuration information for the specified I2C peripheral.
- * @retval None
- */
-void I2C_Init(I2C_TypeDef* I2Cx, I2C_InitTypeDef* I2C_InitStruct)
-{
- uint16_t tmpreg = 0, freqrange = 0;
- uint16_t result = 0x04;
- uint32_t pclk1 = 8000000;
- RCC_ClocksTypeDef rcc_clocks;
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_I2C_CLOCK_SPEED(I2C_InitStruct->I2C_ClockSpeed));
- assert_param(IS_I2C_MODE(I2C_InitStruct->I2C_Mode));
- assert_param(IS_I2C_DUTY_CYCLE(I2C_InitStruct->I2C_DutyCycle));
- assert_param(IS_I2C_OWN_ADDRESS1(I2C_InitStruct->I2C_OwnAddress1));
- assert_param(IS_I2C_ACK_STATE(I2C_InitStruct->I2C_Ack));
- assert_param(IS_I2C_ACKNOWLEDGE_ADDRESS(I2C_InitStruct->I2C_AcknowledgedAddress));
-
-/*---------------------------- I2Cx CR2 Configuration ------------------------*/
- /* Get the I2Cx CR2 value */
- tmpreg = I2Cx->CR2;
- /* Clear frequency FREQ[5:0] bits */
- tmpreg &= CR2_FREQ_Reset;
- /* Get pclk1 frequency value */
- RCC_GetClocksFreq(&rcc_clocks);
- pclk1 = rcc_clocks.PCLK1_Frequency;
- /* Set frequency bits depending on pclk1 value */
- freqrange = (uint16_t)(pclk1 / 1000000);
- tmpreg |= freqrange;
- /* Write to I2Cx CR2 */
- I2Cx->CR2 = tmpreg;
-
-/*---------------------------- I2Cx CCR Configuration ------------------------*/
- /* Disable the selected I2C peripheral to configure TRISE */
- I2Cx->CR1 &= CR1_PE_Reset;
- /* Reset tmpreg value */
- /* Clear F/S, DUTY and CCR[11:0] bits */
- tmpreg = 0;
-
- /* Configure speed in standard mode */
- if (I2C_InitStruct->I2C_ClockSpeed <= 100000)
- {
- /* Standard mode speed calculate */
- result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed << 1));
- /* Test if CCR value is under 0x4*/
- if (result < 0x04)
- {
- /* Set minimum allowed value */
- result = 0x04;
- }
- /* Set speed value for standard mode */
- tmpreg |= result;
- /* Set Maximum Rise Time for standard mode */
- I2Cx->TRISE = freqrange + 1;
- }
- /* Configure speed in fast mode */
- else /*(I2C_InitStruct->I2C_ClockSpeed <= 400000)*/
- {
- if (I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_2)
- {
- /* Fast mode speed calculate: Tlow/Thigh = 2 */
- result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 3));
- }
- else /*I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_16_9*/
- {
- /* Fast mode speed calculate: Tlow/Thigh = 16/9 */
- result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 25));
- /* Set DUTY bit */
- result |= I2C_DutyCycle_16_9;
- }
-
- /* Test if CCR value is under 0x1*/
- if ((result & CCR_CCR_Set) == 0)
- {
- /* Set minimum allowed value */
- result |= (uint16_t)0x0001;
- }
- /* Set speed value and set F/S bit for fast mode */
- tmpreg |= (uint16_t)(result | CCR_FS_Set);
- /* Set Maximum Rise Time for fast mode */
- I2Cx->TRISE = (uint16_t)(((freqrange * (uint16_t)300) / (uint16_t)1000) + (uint16_t)1);
- }
-
- /* Write to I2Cx CCR */
- I2Cx->CCR = tmpreg;
- /* Enable the selected I2C peripheral */
- I2Cx->CR1 |= CR1_PE_Set;
-
-/*---------------------------- I2Cx CR1 Configuration ------------------------*/
- /* Get the I2Cx CR1 value */
- tmpreg = I2Cx->CR1;
- /* Clear ACK, SMBTYPE and SMBUS bits */
- tmpreg &= CR1_CLEAR_Mask;
- /* Configure I2Cx: mode and acknowledgement */
- /* Set SMBTYPE and SMBUS bits according to I2C_Mode value */
- /* Set ACK bit according to I2C_Ack value */
- tmpreg |= (uint16_t)((uint32_t)I2C_InitStruct->I2C_Mode | I2C_InitStruct->I2C_Ack);
- /* Write to I2Cx CR1 */
- I2Cx->CR1 = tmpreg;
-
-/*---------------------------- I2Cx OAR1 Configuration -----------------------*/
- /* Set I2Cx Own Address1 and acknowledged address */
- I2Cx->OAR1 = (I2C_InitStruct->I2C_AcknowledgedAddress | I2C_InitStruct->I2C_OwnAddress1);
-}
-
-/**
- * @brief Fills each I2C_InitStruct member with its default value.
- * @param I2C_InitStruct: pointer to an I2C_InitTypeDef structure which will be initialized.
- * @retval None
- */
-void I2C_StructInit(I2C_InitTypeDef* I2C_InitStruct)
-{
-/*---------------- Reset I2C init structure parameters values ----------------*/
- /* initialize the I2C_ClockSpeed member */
- I2C_InitStruct->I2C_ClockSpeed = 5000;
- /* Initialize the I2C_Mode member */
- I2C_InitStruct->I2C_Mode = I2C_Mode_I2C;
- /* Initialize the I2C_DutyCycle member */
- I2C_InitStruct->I2C_DutyCycle = I2C_DutyCycle_2;
- /* Initialize the I2C_OwnAddress1 member */
- I2C_InitStruct->I2C_OwnAddress1 = 0;
- /* Initialize the I2C_Ack member */
- I2C_InitStruct->I2C_Ack = I2C_Ack_Disable;
- /* Initialize the I2C_AcknowledgedAddress member */
- I2C_InitStruct->I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
-}
-
-/**
- * @brief Enables or disables the specified I2C peripheral.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param NewState: new state of the I2Cx peripheral.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None
- */
-void I2C_Cmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState != DISABLE)
- {
- /* Enable the selected I2C peripheral */
- I2Cx->CR1 |= CR1_PE_Set;
- }
- else
- {
- /* Disable the selected I2C peripheral */
- I2Cx->CR1 &= CR1_PE_Reset;
- }
-}
-
-/**
- * @brief Enables or disables the specified I2C DMA requests.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param NewState: new state of the I2C DMA transfer.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None
- */
-void I2C_DMACmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState != DISABLE)
- {
- /* Enable the selected I2C DMA requests */
- I2Cx->CR2 |= CR2_DMAEN_Set;
- }
- else
- {
- /* Disable the selected I2C DMA requests */
- I2Cx->CR2 &= CR2_DMAEN_Reset;
- }
-}
-
-/**
- * @brief Specifies if the next DMA transfer will be the last one.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param NewState: new state of the I2C DMA last transfer.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None
- */
-void I2C_DMALastTransferCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState != DISABLE)
- {
- /* Next DMA transfer is the last transfer */
- I2Cx->CR2 |= CR2_LAST_Set;
- }
- else
- {
- /* Next DMA transfer is not the last transfer */
- I2Cx->CR2 &= CR2_LAST_Reset;
- }
-}
-
-/**
- * @brief Generates I2Cx communication START condition.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param NewState: new state of the I2C START condition generation.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None.
- */
-void I2C_GenerateSTART(I2C_TypeDef* I2Cx, FunctionalState NewState)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState != DISABLE)
- {
- /* Generate a START condition */
- I2Cx->CR1 |= CR1_START_Set;
- }
- else
- {
- /* Disable the START condition generation */
- I2Cx->CR1 &= CR1_START_Reset;
- }
-}
-
-/**
- * @brief Generates I2Cx communication STOP condition.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param NewState: new state of the I2C STOP condition generation.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None.
- */
-void I2C_GenerateSTOP(I2C_TypeDef* I2Cx, FunctionalState NewState)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState != DISABLE)
- {
- /* Generate a STOP condition */
- I2Cx->CR1 |= CR1_STOP_Set;
- }
- else
- {
- /* Disable the STOP condition generation */
- I2Cx->CR1 &= CR1_STOP_Reset;
- }
-}
-
-/**
- * @brief Enables or disables the specified I2C acknowledge feature.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param NewState: new state of the I2C Acknowledgement.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None.
- */
-void I2C_AcknowledgeConfig(I2C_TypeDef* I2Cx, FunctionalState NewState)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState != DISABLE)
- {
- /* Enable the acknowledgement */
- I2Cx->CR1 |= CR1_ACK_Set;
- }
- else
- {
- /* Disable the acknowledgement */
- I2Cx->CR1 &= CR1_ACK_Reset;
- }
-}
-
-/**
- * @brief Configures the specified I2C own address2.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param Address: specifies the 7bit I2C own address2.
- * @retval None.
- */
-void I2C_OwnAddress2Config(I2C_TypeDef* I2Cx, uint8_t Address)
-{
- uint16_t tmpreg = 0;
-
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
-
- /* Get the old register value */
- tmpreg = I2Cx->OAR2;
-
- /* Reset I2Cx Own address2 bit [7:1] */
- tmpreg &= OAR2_ADD2_Reset;
-
- /* Set I2Cx Own address2 */
- tmpreg |= (uint16_t)((uint16_t)Address & (uint16_t)0x00FE);
-
- /* Store the new register value */
- I2Cx->OAR2 = tmpreg;
-}
-
-/**
- * @brief Enables or disables the specified I2C dual addressing mode.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param NewState: new state of the I2C dual addressing mode.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None
- */
-void I2C_DualAddressCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState != DISABLE)
- {
- /* Enable dual addressing mode */
- I2Cx->OAR2 |= OAR2_ENDUAL_Set;
- }
- else
- {
- /* Disable dual addressing mode */
- I2Cx->OAR2 &= OAR2_ENDUAL_Reset;
- }
-}
-
-/**
- * @brief Enables or disables the specified I2C general call feature.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param NewState: new state of the I2C General call.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None
- */
-void I2C_GeneralCallCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState != DISABLE)
- {
- /* Enable generall call */
- I2Cx->CR1 |= CR1_ENGC_Set;
- }
- else
- {
- /* Disable generall call */
- I2Cx->CR1 &= CR1_ENGC_Reset;
- }
-}
-
-/**
- * @brief Enables or disables the specified I2C interrupts.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param I2C_IT: specifies the I2C interrupts sources to be enabled or disabled.
- * This parameter can be any combination of the following values:
- * @arg I2C_IT_BUF: Buffer interrupt mask
- * @arg I2C_IT_EVT: Event interrupt mask
- * @arg I2C_IT_ERR: Error interrupt mask
- * @param NewState: new state of the specified I2C interrupts.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None
- */
-void I2C_ITConfig(I2C_TypeDef* I2Cx, uint16_t I2C_IT, FunctionalState NewState)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- assert_param(IS_I2C_CONFIG_IT(I2C_IT));
-
- if (NewState != DISABLE)
- {
- /* Enable the selected I2C interrupts */
- I2Cx->CR2 |= I2C_IT;
- }
- else
- {
- /* Disable the selected I2C interrupts */
- I2Cx->CR2 &= (uint16_t)~I2C_IT;
- }
-}
-
-/**
- * @brief Sends a data byte through the I2Cx peripheral.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param Data: Byte to be transmitted..
- * @retval None
- */
-void I2C_SendData(I2C_TypeDef* I2Cx, uint8_t Data)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- /* Write in the DR register the data to be sent */
- I2Cx->DR = Data;
-}
-
-/**
- * @brief Returns the most recent received data by the I2Cx peripheral.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @retval The value of the received data.
- */
-uint8_t I2C_ReceiveData(I2C_TypeDef* I2Cx)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- /* Return the data in the DR register */
- return (uint8_t)I2Cx->DR;
-}
-
-/**
- * @brief Transmits the address byte to select the slave device.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param Address: specifies the slave address which will be transmitted
- * @param I2C_Direction: specifies whether the I2C device will be a
- * Transmitter or a Receiver. This parameter can be one of the following values
- * @arg I2C_Direction_Transmitter: Transmitter mode
- * @arg I2C_Direction_Receiver: Receiver mode
- * @retval None.
- */
-void I2C_Send7bitAddress(I2C_TypeDef* I2Cx, uint8_t Address, uint8_t I2C_Direction)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_I2C_DIRECTION(I2C_Direction));
- /* Test on the direction to set/reset the read/write bit */
- if (I2C_Direction != I2C_Direction_Transmitter)
- {
- /* Set the address bit0 for read */
- Address |= OAR1_ADD0_Set;
- }
- else
- {
- /* Reset the address bit0 for write */
- Address &= OAR1_ADD0_Reset;
- }
- /* Send the address */
- I2Cx->DR = Address;
-}
-
-/**
- * @brief Reads the specified I2C register and returns its value.
- * @param I2C_Register: specifies the register to read.
- * This parameter can be one of the following values:
- * @arg I2C_Register_CR1: CR1 register.
- * @arg I2C_Register_CR2: CR2 register.
- * @arg I2C_Register_OAR1: OAR1 register.
- * @arg I2C_Register_OAR2: OAR2 register.
- * @arg I2C_Register_DR: DR register.
- * @arg I2C_Register_SR1: SR1 register.
- * @arg I2C_Register_SR2: SR2 register.
- * @arg I2C_Register_CCR: CCR register.
- * @arg I2C_Register_TRISE: TRISE register.
- * @retval The value of the read register.
- */
-uint16_t I2C_ReadRegister(I2C_TypeDef* I2Cx, uint8_t I2C_Register)
-{
- __IO uint32_t tmp = 0;
-
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_I2C_REGISTER(I2C_Register));
-
- tmp = (uint32_t) I2Cx;
- tmp += I2C_Register;
-
- /* Return the selected register value */
- return (*(__IO uint16_t *) tmp);
-}
-
-/**
- * @brief Enables or disables the specified I2C software reset.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param NewState: new state of the I2C software reset.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None
- */
-void I2C_SoftwareResetCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState != DISABLE)
- {
- /* Peripheral under reset */
- I2Cx->CR1 |= CR1_SWRST_Set;
- }
- else
- {
- /* Peripheral not under reset */
- I2Cx->CR1 &= CR1_SWRST_Reset;
- }
-}
-
-/**
- * @brief Selects the specified I2C NACK position in master receiver mode.
- * This function is useful in I2C Master Receiver mode when the number
- * of data to be received is equal to 2. In this case, this function
- * should be called (with parameter I2C_NACKPosition_Next) before data
- * reception starts,as described in the 2-byte reception procedure
- * recommended in Reference Manual in Section: Master receiver.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param I2C_NACKPosition: specifies the NACK position.
- * This parameter can be one of the following values:
- * @arg I2C_NACKPosition_Next: indicates that the next byte will be the last
- * received byte.
- * @arg I2C_NACKPosition_Current: indicates that current byte is the last
- * received byte.
- *
- * @note This function configures the same bit (POS) as I2C_PECPositionConfig()
- * but is intended to be used in I2C mode while I2C_PECPositionConfig()
- * is intended to used in SMBUS mode.
- *
- * @retval None
- */
-void I2C_NACKPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_NACKPosition)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_I2C_NACK_POSITION(I2C_NACKPosition));
-
- /* Check the input parameter */
- if (I2C_NACKPosition == I2C_NACKPosition_Next)
- {
- /* Next byte in shift register is the last received byte */
- I2Cx->CR1 |= I2C_NACKPosition_Next;
- }
- else
- {
- /* Current byte in shift register is the last received byte */
- I2Cx->CR1 &= I2C_NACKPosition_Current;
- }
-}
-
-/**
- * @brief Drives the SMBusAlert pin high or low for the specified I2C.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param I2C_SMBusAlert: specifies SMBAlert pin level.
- * This parameter can be one of the following values:
- * @arg I2C_SMBusAlert_Low: SMBAlert pin driven low
- * @arg I2C_SMBusAlert_High: SMBAlert pin driven high
- * @retval None
- */
-void I2C_SMBusAlertConfig(I2C_TypeDef* I2Cx, uint16_t I2C_SMBusAlert)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_I2C_SMBUS_ALERT(I2C_SMBusAlert));
- if (I2C_SMBusAlert == I2C_SMBusAlert_Low)
- {
- /* Drive the SMBusAlert pin Low */
- I2Cx->CR1 |= I2C_SMBusAlert_Low;
- }
- else
- {
- /* Drive the SMBusAlert pin High */
- I2Cx->CR1 &= I2C_SMBusAlert_High;
- }
-}
-
-/**
- * @brief Enables or disables the specified I2C PEC transfer.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param NewState: new state of the I2C PEC transmission.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None
- */
-void I2C_TransmitPEC(I2C_TypeDef* I2Cx, FunctionalState NewState)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState != DISABLE)
- {
- /* Enable the selected I2C PEC transmission */
- I2Cx->CR1 |= CR1_PEC_Set;
- }
- else
- {
- /* Disable the selected I2C PEC transmission */
- I2Cx->CR1 &= CR1_PEC_Reset;
- }
-}
-
-/**
- * @brief Selects the specified I2C PEC position.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param I2C_PECPosition: specifies the PEC position.
- * This parameter can be one of the following values:
- * @arg I2C_PECPosition_Next: indicates that the next byte is PEC
- * @arg I2C_PECPosition_Current: indicates that current byte is PEC
- *
- * @note This function configures the same bit (POS) as I2C_NACKPositionConfig()
- * but is intended to be used in SMBUS mode while I2C_NACKPositionConfig()
- * is intended to used in I2C mode.
- *
- * @retval None
- */
-void I2C_PECPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_PECPosition)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_I2C_PEC_POSITION(I2C_PECPosition));
- if (I2C_PECPosition == I2C_PECPosition_Next)
- {
- /* Next byte in shift register is PEC */
- I2Cx->CR1 |= I2C_PECPosition_Next;
- }
- else
- {
- /* Current byte in shift register is PEC */
- I2Cx->CR1 &= I2C_PECPosition_Current;
- }
-}
-
-/**
- * @brief Enables or disables the PEC value calculation of the transferred bytes.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param NewState: new state of the I2Cx PEC value calculation.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None
- */
-void I2C_CalculatePEC(I2C_TypeDef* I2Cx, FunctionalState NewState)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState != DISABLE)
- {
- /* Enable the selected I2C PEC calculation */
- I2Cx->CR1 |= CR1_ENPEC_Set;
- }
- else
- {
- /* Disable the selected I2C PEC calculation */
- I2Cx->CR1 &= CR1_ENPEC_Reset;
- }
-}
-
-/**
- * @brief Returns the PEC value for the specified I2C.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @retval The PEC value.
- */
-uint8_t I2C_GetPEC(I2C_TypeDef* I2Cx)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- /* Return the selected I2C PEC value */
- return ((I2Cx->SR2) >> 8);
-}
-
-/**
- * @brief Enables or disables the specified I2C ARP.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param NewState: new state of the I2Cx ARP.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None
- */
-void I2C_ARPCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState != DISABLE)
- {
- /* Enable the selected I2C ARP */
- I2Cx->CR1 |= CR1_ENARP_Set;
- }
- else
- {
- /* Disable the selected I2C ARP */
- I2Cx->CR1 &= CR1_ENARP_Reset;
- }
-}
-
-/**
- * @brief Enables or disables the specified I2C Clock stretching.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param NewState: new state of the I2Cx Clock stretching.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None
- */
-void I2C_StretchClockCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState == DISABLE)
- {
- /* Enable the selected I2C Clock stretching */
- I2Cx->CR1 |= CR1_NOSTRETCH_Set;
- }
- else
- {
- /* Disable the selected I2C Clock stretching */
- I2Cx->CR1 &= CR1_NOSTRETCH_Reset;
- }
-}
-
-/**
- * @brief Selects the specified I2C fast mode duty cycle.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param I2C_DutyCycle: specifies the fast mode duty cycle.
- * This parameter can be one of the following values:
- * @arg I2C_DutyCycle_2: I2C fast mode Tlow/Thigh = 2
- * @arg I2C_DutyCycle_16_9: I2C fast mode Tlow/Thigh = 16/9
- * @retval None
- */
-void I2C_FastModeDutyCycleConfig(I2C_TypeDef* I2Cx, uint16_t I2C_DutyCycle)
-{
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_I2C_DUTY_CYCLE(I2C_DutyCycle));
- if (I2C_DutyCycle != I2C_DutyCycle_16_9)
- {
- /* I2C fast mode Tlow/Thigh=2 */
- I2Cx->CCR &= I2C_DutyCycle_2;
- }
- else
- {
- /* I2C fast mode Tlow/Thigh=16/9 */
- I2Cx->CCR |= I2C_DutyCycle_16_9;
- }
-}
-
-
-
-/**
- * @brief
- ****************************************************************************************
- *
- * I2C State Monitoring Functions
- *
- ****************************************************************************************
- * This I2C driver provides three different ways for I2C state monitoring
- * depending on the application requirements and constraints:
- *
- *
- * 1) Basic state monitoring:
- * Using I2C_CheckEvent() function:
- * It compares the status registers (SR1 and SR2) content to a given event
- * (can be the combination of one or more flags).
- * It returns SUCCESS if the current status includes the given flags
- * and returns ERROR if one or more flags are missing in the current status.
- * - When to use:
- * - This function is suitable for most applications as well as for startup
- * activity since the events are fully described in the product reference manual
- * (RM0008).
- * - It is also suitable for users who need to define their own events.
- * - Limitations:
- * - If an error occurs (ie. error flags are set besides to the monitored flags),
- * the I2C_CheckEvent() function may return SUCCESS despite the communication
- * hold or corrupted real state.
- * In this case, it is advised to use error interrupts to monitor the error
- * events and handle them in the interrupt IRQ handler.
- *
- * @note
- * For error management, it is advised to use the following functions:
- * - I2C_ITConfig() to configure and enable the error interrupts (I2C_IT_ERR).
- * - I2Cx_ER_IRQHandler() which is called when the error interrupt occurs.
- * Where x is the peripheral instance (I2C1, I2C2 ...)
- * - I2C_GetFlagStatus() or I2C_GetITStatus() to be called into I2Cx_ER_IRQHandler()
- * in order to determine which error occured.
- * - I2C_ClearFlag() or I2C_ClearITPendingBit() and/or I2C_SoftwareResetCmd()
- * and/or I2C_GenerateStop() in order to clear the error flag and source,
- * and return to correct communication status.
- *
- *
- * 2) Advanced state monitoring:
- * Using the function I2C_GetLastEvent() which returns the image of both status
- * registers in a single word (uint32_t) (Status Register 2 value is shifted left
- * by 16 bits and concatenated to Status Register 1).
- * - When to use:
- * - This function is suitable for the same applications above but it allows to
- * overcome the mentioned limitation of I2C_GetFlagStatus() function.
- * The returned value could be compared to events already defined in the
- * library (stm32f10x_i2c.h) or to custom values defined by user.
- * - This function is suitable when multiple flags are monitored at the same time.
- * - At the opposite of I2C_CheckEvent() function, this function allows user to
- * choose when an event is accepted (when all events flags are set and no
- * other flags are set or just when the needed flags are set like
- * I2C_CheckEvent() function).
- * - Limitations:
- * - User may need to define his own events.
- * - Same remark concerning the error management is applicable for this
- * function if user decides to check only regular communication flags (and
- * ignores error flags).
- *
- *
- * 3) Flag-based state monitoring:
- * Using the function I2C_GetFlagStatus() which simply returns the status of
- * one single flag (ie. I2C_FLAG_RXNE ...).
- * - When to use:
- * - This function could be used for specific applications or in debug phase.
- * - It is suitable when only one flag checking is needed (most I2C events
- * are monitored through multiple flags).
- * - Limitations:
- * - When calling this function, the Status register is accessed. Some flags are
- * cleared when the status register is accessed. So checking the status
- * of one Flag, may clear other ones.
- * - Function may need to be called twice or more in order to monitor one
- * single event.
- *
- * For detailed description of Events, please refer to section I2C_Events in
- * stm32f10x_i2c.h file.
- *
- */
-
-/**
- *
- * 1) Basic state monitoring
- *******************************************************************************
- */
-
-/**
- * @brief Checks whether the last I2Cx Event is equal to the one passed
- * as parameter.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param I2C_EVENT: specifies the event to be checked.
- * This parameter can be one of the following values:
- * @arg I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED : EV1
- * @arg I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED : EV1
- * @arg I2C_EVENT_SLAVE_TRANSMITTER_SECONDADDRESS_MATCHED : EV1
- * @arg I2C_EVENT_SLAVE_RECEIVER_SECONDADDRESS_MATCHED : EV1
- * @arg I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED : EV1
- * @arg I2C_EVENT_SLAVE_BYTE_RECEIVED : EV2
- * @arg (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_DUALF) : EV2
- * @arg (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_GENCALL) : EV2
- * @arg I2C_EVENT_SLAVE_BYTE_TRANSMITTED : EV3
- * @arg (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_DUALF) : EV3
- * @arg (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_GENCALL) : EV3
- * @arg I2C_EVENT_SLAVE_ACK_FAILURE : EV3_2
- * @arg I2C_EVENT_SLAVE_STOP_DETECTED : EV4
- * @arg I2C_EVENT_MASTER_MODE_SELECT : EV5
- * @arg I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED : EV6
- * @arg I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED : EV6
- * @arg I2C_EVENT_MASTER_BYTE_RECEIVED : EV7
- * @arg I2C_EVENT_MASTER_BYTE_TRANSMITTING : EV8
- * @arg I2C_EVENT_MASTER_BYTE_TRANSMITTED : EV8_2
- * @arg I2C_EVENT_MASTER_MODE_ADDRESS10 : EV9
- *
- * @note: For detailed description of Events, please refer to section
- * I2C_Events in stm32f10x_i2c.h file.
- *
- * @retval An ErrorStatus enumeration value:
- * - SUCCESS: Last event is equal to the I2C_EVENT
- * - ERROR: Last event is different from the I2C_EVENT
- */
-ErrorStatus I2C_CheckEvent(I2C_TypeDef* I2Cx, uint32_t I2C_EVENT)
-{
- uint32_t lastevent = 0;
- uint32_t flag1 = 0, flag2 = 0;
- ErrorStatus status = ERROR;
-
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_I2C_EVENT(I2C_EVENT));
-
- /* Read the I2Cx status register */
- flag1 = I2Cx->SR1;
- flag2 = I2Cx->SR2;
- flag2 = flag2 << 16;
-
- /* Get the last event value from I2C status register */
- lastevent = (flag1 | flag2) & FLAG_Mask;
-
- /* Check whether the last event contains the I2C_EVENT */
- if ((lastevent & I2C_EVENT) == I2C_EVENT)
- {
- /* SUCCESS: last event is equal to I2C_EVENT */
- status = SUCCESS;
- }
- else
- {
- /* ERROR: last event is different from I2C_EVENT */
- status = ERROR;
- }
- /* Return status */
- return status;
-}
-
-/**
- *
- * 2) Advanced state monitoring
- *******************************************************************************
- */
-
-/**
- * @brief Returns the last I2Cx Event.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- *
- * @note: For detailed description of Events, please refer to section
- * I2C_Events in stm32f10x_i2c.h file.
- *
- * @retval The last event
- */
-uint32_t I2C_GetLastEvent(I2C_TypeDef* I2Cx)
-{
- uint32_t lastevent = 0;
- uint32_t flag1 = 0, flag2 = 0;
-
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
-
- /* Read the I2Cx status register */
- flag1 = I2Cx->SR1;
- flag2 = I2Cx->SR2;
- flag2 = flag2 << 16;
-
- /* Get the last event value from I2C status register */
- lastevent = (flag1 | flag2) & FLAG_Mask;
-
- /* Return status */
- return lastevent;
-}
-
-/**
- *
- * 3) Flag-based state monitoring
- *******************************************************************************
- */
-
-/**
- * @brief Checks whether the specified I2C flag is set or not.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param I2C_FLAG: specifies the flag to check.
- * This parameter can be one of the following values:
- * @arg I2C_FLAG_DUALF: Dual flag (Slave mode)
- * @arg I2C_FLAG_SMBHOST: SMBus host header (Slave mode)
- * @arg I2C_FLAG_SMBDEFAULT: SMBus default header (Slave mode)
- * @arg I2C_FLAG_GENCALL: General call header flag (Slave mode)
- * @arg I2C_FLAG_TRA: Transmitter/Receiver flag
- * @arg I2C_FLAG_BUSY: Bus busy flag
- * @arg I2C_FLAG_MSL: Master/Slave flag
- * @arg I2C_FLAG_SMBALERT: SMBus Alert flag
- * @arg I2C_FLAG_TIMEOUT: Timeout or Tlow error flag
- * @arg I2C_FLAG_PECERR: PEC error in reception flag
- * @arg I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode)
- * @arg I2C_FLAG_AF: Acknowledge failure flag
- * @arg I2C_FLAG_ARLO: Arbitration lost flag (Master mode)
- * @arg I2C_FLAG_BERR: Bus error flag
- * @arg I2C_FLAG_TXE: Data register empty flag (Transmitter)
- * @arg I2C_FLAG_RXNE: Data register not empty (Receiver) flag
- * @arg I2C_FLAG_STOPF: Stop detection flag (Slave mode)
- * @arg I2C_FLAG_ADD10: 10-bit header sent flag (Master mode)
- * @arg I2C_FLAG_BTF: Byte transfer finished flag
- * @arg I2C_FLAG_ADDR: Address sent flag (Master mode) "ADSL"
- * Address matched flag (Slave mode)"ENDA"
- * @arg I2C_FLAG_SB: Start bit flag (Master mode)
- * @retval The new state of I2C_FLAG (SET or RESET).
- */
-FlagStatus I2C_GetFlagStatus(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG)
-{
- FlagStatus bitstatus = RESET;
- __IO uint32_t i2creg = 0, i2cxbase = 0;
-
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_I2C_GET_FLAG(I2C_FLAG));
-
- /* Get the I2Cx peripheral base address */
- i2cxbase = (uint32_t)I2Cx;
-
- /* Read flag register index */
- i2creg = I2C_FLAG >> 28;
-
- /* Get bit[23:0] of the flag */
- I2C_FLAG &= FLAG_Mask;
-
- if(i2creg != 0)
- {
- /* Get the I2Cx SR1 register address */
- i2cxbase += 0x14;
- }
- else
- {
- /* Flag in I2Cx SR2 Register */
- I2C_FLAG = (uint32_t)(I2C_FLAG >> 16);
- /* Get the I2Cx SR2 register address */
- i2cxbase += 0x18;
- }
-
- if(((*(__IO uint32_t *)i2cxbase) & I2C_FLAG) != (uint32_t)RESET)
- {
- /* I2C_FLAG is set */
- bitstatus = SET;
- }
- else
- {
- /* I2C_FLAG is reset */
- bitstatus = RESET;
- }
-
- /* Return the I2C_FLAG status */
- return bitstatus;
-}
-
-
-
-/**
- * @brief Clears the I2Cx's pending flags.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param I2C_FLAG: specifies the flag to clear.
- * This parameter can be any combination of the following values:
- * @arg I2C_FLAG_SMBALERT: SMBus Alert flag
- * @arg I2C_FLAG_TIMEOUT: Timeout or Tlow error flag
- * @arg I2C_FLAG_PECERR: PEC error in reception flag
- * @arg I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode)
- * @arg I2C_FLAG_AF: Acknowledge failure flag
- * @arg I2C_FLAG_ARLO: Arbitration lost flag (Master mode)
- * @arg I2C_FLAG_BERR: Bus error flag
- *
- * @note
- * - STOPF (STOP detection) is cleared by software sequence: a read operation
- * to I2C_SR1 register (I2C_GetFlagStatus()) followed by a write operation
- * to I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral).
- * - ADD10 (10-bit header sent) is cleared by software sequence: a read
- * operation to I2C_SR1 (I2C_GetFlagStatus()) followed by writing the
- * second byte of the address in DR register.
- * - BTF (Byte Transfer Finished) is cleared by software sequence: a read
- * operation to I2C_SR1 register (I2C_GetFlagStatus()) followed by a
- * read/write to I2C_DR register (I2C_SendData()).
- * - ADDR (Address sent) is cleared by software sequence: a read operation to
- * I2C_SR1 register (I2C_GetFlagStatus()) followed by a read operation to
- * I2C_SR2 register ((void)(I2Cx->SR2)).
- * - SB (Start Bit) is cleared software sequence: a read operation to I2C_SR1
- * register (I2C_GetFlagStatus()) followed by a write operation to I2C_DR
- * register (I2C_SendData()).
- * @retval None
- */
-void I2C_ClearFlag(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG)
-{
- uint32_t flagpos = 0;
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_I2C_CLEAR_FLAG(I2C_FLAG));
- /* Get the I2C flag position */
- flagpos = I2C_FLAG & FLAG_Mask;
- /* Clear the selected I2C flag */
- I2Cx->SR1 = (uint16_t)~flagpos;
-}
-
-/**
- * @brief Checks whether the specified I2C interrupt has occurred or not.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param I2C_IT: specifies the interrupt source to check.
- * This parameter can be one of the following values:
- * @arg I2C_IT_SMBALERT: SMBus Alert flag
- * @arg I2C_IT_TIMEOUT: Timeout or Tlow error flag
- * @arg I2C_IT_PECERR: PEC error in reception flag
- * @arg I2C_IT_OVR: Overrun/Underrun flag (Slave mode)
- * @arg I2C_IT_AF: Acknowledge failure flag
- * @arg I2C_IT_ARLO: Arbitration lost flag (Master mode)
- * @arg I2C_IT_BERR: Bus error flag
- * @arg I2C_IT_TXE: Data register empty flag (Transmitter)
- * @arg I2C_IT_RXNE: Data register not empty (Receiver) flag
- * @arg I2C_IT_STOPF: Stop detection flag (Slave mode)
- * @arg I2C_IT_ADD10: 10-bit header sent flag (Master mode)
- * @arg I2C_IT_BTF: Byte transfer finished flag
- * @arg I2C_IT_ADDR: Address sent flag (Master mode) "ADSL"
- * Address matched flag (Slave mode)"ENDAD"
- * @arg I2C_IT_SB: Start bit flag (Master mode)
- * @retval The new state of I2C_IT (SET or RESET).
- */
-ITStatus I2C_GetITStatus(I2C_TypeDef* I2Cx, uint32_t I2C_IT)
-{
- ITStatus bitstatus = RESET;
- uint32_t enablestatus = 0;
-
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_I2C_GET_IT(I2C_IT));
-
- /* Check if the interrupt source is enabled or not */
- enablestatus = (uint32_t)(((I2C_IT & ITEN_Mask) >> 16) & (I2Cx->CR2)) ;
-
- /* Get bit[23:0] of the flag */
- I2C_IT &= FLAG_Mask;
-
- /* Check the status of the specified I2C flag */
- if (((I2Cx->SR1 & I2C_IT) != (uint32_t)RESET) && enablestatus)
- {
- /* I2C_IT is set */
- bitstatus = SET;
- }
- else
- {
- /* I2C_IT is reset */
- bitstatus = RESET;
- }
- /* Return the I2C_IT status */
- return bitstatus;
-}
-
-/**
- * @brief Clears the I2Cx�s interrupt pending bits.
- * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
- * @param I2C_IT: specifies the interrupt pending bit to clear.
- * This parameter can be any combination of the following values:
- * @arg I2C_IT_SMBALERT: SMBus Alert interrupt
- * @arg I2C_IT_TIMEOUT: Timeout or Tlow error interrupt
- * @arg I2C_IT_PECERR: PEC error in reception interrupt
- * @arg I2C_IT_OVR: Overrun/Underrun interrupt (Slave mode)
- * @arg I2C_IT_AF: Acknowledge failure interrupt
- * @arg I2C_IT_ARLO: Arbitration lost interrupt (Master mode)
- * @arg I2C_IT_BERR: Bus error interrupt
- *
- * @note
- * - STOPF (STOP detection) is cleared by software sequence: a read operation
- * to I2C_SR1 register (I2C_GetITStatus()) followed by a write operation to
- * I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral).
- * - ADD10 (10-bit header sent) is cleared by software sequence: a read
- * operation to I2C_SR1 (I2C_GetITStatus()) followed by writing the second
- * byte of the address in I2C_DR register.
- * - BTF (Byte Transfer Finished) is cleared by software sequence: a read
- * operation to I2C_SR1 register (I2C_GetITStatus()) followed by a
- * read/write to I2C_DR register (I2C_SendData()).
- * - ADDR (Address sent) is cleared by software sequence: a read operation to
- * I2C_SR1 register (I2C_GetITStatus()) followed by a read operation to
- * I2C_SR2 register ((void)(I2Cx->SR2)).
- * - SB (Start Bit) is cleared by software sequence: a read operation to
- * I2C_SR1 register (I2C_GetITStatus()) followed by a write operation to
- * I2C_DR register (I2C_SendData()).
- * @retval None
- */
-void I2C_ClearITPendingBit(I2C_TypeDef* I2Cx, uint32_t I2C_IT)
-{
- uint32_t flagpos = 0;
- /* Check the parameters */
- assert_param(IS_I2C_ALL_PERIPH(I2Cx));
- assert_param(IS_I2C_CLEAR_IT(I2C_IT));
- /* Get the I2C flag position */
- flagpos = I2C_IT & FLAG_Mask;
- /* Clear the selected I2C flag */
- I2Cx->SR1 = (uint16_t)~flagpos;
-}
-
-/**
- * @}
- */
-
-/**
- * @}
- */
-
-/**
- * @}
- */
-
-/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
+/**
+ ******************************************************************************
+ * @file stm32f10x_i2c.c
+ * @author MCD Application Team
+ * @version V3.5.0
+ * @date 11-March-2011
+ * @brief This file provides all the I2C firmware functions.
+ ******************************************************************************
+ * @attention
+ *
+ * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
+ * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
+ * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
+ * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
+ * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
+ * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
+ *
+ * <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2>
+ ******************************************************************************
+ */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f10x_i2c.h"
+#include "stm32f10x_rcc.h"
+
+
+/** @addtogroup STM32F10x_StdPeriph_Driver
+ * @{
+ */
+
+/** @defgroup I2C
+ * @brief I2C driver modules
+ * @{
+ */
+
+/** @defgroup I2C_Private_TypesDefinitions
+ * @{
+ */
+
+/**
+ * @}
+ */
+
+/** @defgroup I2C_Private_Defines
+ * @{
+ */
+
+/* I2C SPE mask */
+#define CR1_PE_Set ((uint16_t)0x0001)
+#define CR1_PE_Reset ((uint16_t)0xFFFE)
+
+/* I2C START mask */
+#define CR1_START_Set ((uint16_t)0x0100)
+#define CR1_START_Reset ((uint16_t)0xFEFF)
+
+/* I2C STOP mask */
+#define CR1_STOP_Set ((uint16_t)0x0200)
+#define CR1_STOP_Reset ((uint16_t)0xFDFF)
+
+/* I2C ACK mask */
+#define CR1_ACK_Set ((uint16_t)0x0400)
+#define CR1_ACK_Reset ((uint16_t)0xFBFF)
+
+/* I2C ENGC mask */
+#define CR1_ENGC_Set ((uint16_t)0x0040)
+#define CR1_ENGC_Reset ((uint16_t)0xFFBF)
+
+/* I2C SWRST mask */
+#define CR1_SWRST_Set ((uint16_t)0x8000)
+#define CR1_SWRST_Reset ((uint16_t)0x7FFF)
+
+/* I2C PEC mask */
+#define CR1_PEC_Set ((uint16_t)0x1000)
+#define CR1_PEC_Reset ((uint16_t)0xEFFF)
+
+/* I2C ENPEC mask */
+#define CR1_ENPEC_Set ((uint16_t)0x0020)
+#define CR1_ENPEC_Reset ((uint16_t)0xFFDF)
+
+/* I2C ENARP mask */
+#define CR1_ENARP_Set ((uint16_t)0x0010)
+#define CR1_ENARP_Reset ((uint16_t)0xFFEF)
+
+/* I2C NOSTRETCH mask */
+#define CR1_NOSTRETCH_Set ((uint16_t)0x0080)
+#define CR1_NOSTRETCH_Reset ((uint16_t)0xFF7F)
+
+/* I2C registers Masks */
+#define CR1_CLEAR_Mask ((uint16_t)0xFBF5)
+
+/* I2C DMAEN mask */
+#define CR2_DMAEN_Set ((uint16_t)0x0800)
+#define CR2_DMAEN_Reset ((uint16_t)0xF7FF)
+
+/* I2C LAST mask */
+#define CR2_LAST_Set ((uint16_t)0x1000)
+#define CR2_LAST_Reset ((uint16_t)0xEFFF)
+
+/* I2C FREQ mask */
+#define CR2_FREQ_Reset ((uint16_t)0xFFC0)
+
+/* I2C ADD0 mask */
+#define OAR1_ADD0_Set ((uint16_t)0x0001)
+#define OAR1_ADD0_Reset ((uint16_t)0xFFFE)
+
+/* I2C ENDUAL mask */
+#define OAR2_ENDUAL_Set ((uint16_t)0x0001)
+#define OAR2_ENDUAL_Reset ((uint16_t)0xFFFE)
+
+/* I2C ADD2 mask */
+#define OAR2_ADD2_Reset ((uint16_t)0xFF01)
+
+/* I2C F/S mask */
+#define CCR_FS_Set ((uint16_t)0x8000)
+
+/* I2C CCR mask */
+#define CCR_CCR_Set ((uint16_t)0x0FFF)
+
+/* I2C FLAG mask */
+#define FLAG_Mask ((uint32_t)0x00FFFFFF)
+
+/* I2C Interrupt Enable mask */
+#define ITEN_Mask ((uint32_t)0x07000000)
+
+/**
+ * @}
+ */
+
+/** @defgroup I2C_Private_Macros
+ * @{
+ */
+
+/**
+ * @}
+ */
+
+/** @defgroup I2C_Private_Variables
+ * @{
+ */
+
+/**
+ * @}
+ */
+
+/** @defgroup I2C_Private_FunctionPrototypes
+ * @{
+ */
+
+/**
+ * @}
+ */
+
+/** @defgroup I2C_Private_Functions
+ * @{
+ */
+
+/**
+ * @brief Deinitializes the I2Cx peripheral registers to their default reset values.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @retval None
+ */
+void I2C_DeInit(I2C_TypeDef* I2Cx)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+
+ if (I2Cx == I2C1)
+ {
+ /* Enable I2C1 reset state */
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, ENABLE);
+ /* Release I2C1 from reset state */
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C1, DISABLE);
+ }
+ else
+ {
+ /* Enable I2C2 reset state */
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, ENABLE);
+ /* Release I2C2 from reset state */
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2C2, DISABLE);
+ }
+}
+
+/**
+ * @brief Initializes the I2Cx peripheral according to the specified
+ * parameters in the I2C_InitStruct.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param I2C_InitStruct: pointer to a I2C_InitTypeDef structure that
+ * contains the configuration information for the specified I2C peripheral.
+ * @retval None
+ */
+void I2C_Init(I2C_TypeDef* I2Cx, I2C_InitTypeDef* I2C_InitStruct)
+{
+ uint16_t tmpreg = 0, freqrange = 0;
+ uint16_t result = 0x04;
+ uint32_t pclk1 = 8000000;
+ RCC_ClocksTypeDef rcc_clocks;
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_I2C_CLOCK_SPEED(I2C_InitStruct->I2C_ClockSpeed));
+ assert_param(IS_I2C_MODE(I2C_InitStruct->I2C_Mode));
+ assert_param(IS_I2C_DUTY_CYCLE(I2C_InitStruct->I2C_DutyCycle));
+ assert_param(IS_I2C_OWN_ADDRESS1(I2C_InitStruct->I2C_OwnAddress1));
+ assert_param(IS_I2C_ACK_STATE(I2C_InitStruct->I2C_Ack));
+ assert_param(IS_I2C_ACKNOWLEDGE_ADDRESS(I2C_InitStruct->I2C_AcknowledgedAddress));
+
+/*---------------------------- I2Cx CR2 Configuration ------------------------*/
+ /* Get the I2Cx CR2 value */
+ tmpreg = I2Cx->CR2;
+ /* Clear frequency FREQ[5:0] bits */
+ tmpreg &= CR2_FREQ_Reset;
+ /* Get pclk1 frequency value */
+ RCC_GetClocksFreq(&rcc_clocks);
+ pclk1 = rcc_clocks.PCLK1_Frequency;
+ /* Set frequency bits depending on pclk1 value */
+ freqrange = (uint16_t)(pclk1 / 1000000);
+ tmpreg |= freqrange;
+ /* Write to I2Cx CR2 */
+ I2Cx->CR2 = tmpreg;
+
+/*---------------------------- I2Cx CCR Configuration ------------------------*/
+ /* Disable the selected I2C peripheral to configure TRISE */
+ I2Cx->CR1 &= CR1_PE_Reset;
+ /* Reset tmpreg value */
+ /* Clear F/S, DUTY and CCR[11:0] bits */
+ tmpreg = 0;
+
+ /* Configure speed in standard mode */
+ if (I2C_InitStruct->I2C_ClockSpeed <= 100000)
+ {
+ /* Standard mode speed calculate */
+ result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed << 1));
+ /* Test if CCR value is under 0x4*/
+ if (result < 0x04)
+ {
+ /* Set minimum allowed value */
+ result = 0x04;
+ }
+ /* Set speed value for standard mode */
+ tmpreg |= result;
+ /* Set Maximum Rise Time for standard mode */
+ I2Cx->TRISE = freqrange + 1;
+ }
+ /* Configure speed in fast mode */
+ else /*(I2C_InitStruct->I2C_ClockSpeed <= 400000)*/
+ {
+ if (I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_2)
+ {
+ /* Fast mode speed calculate: Tlow/Thigh = 2 */
+ result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 3));
+ }
+ else /*I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_16_9*/
+ {
+ /* Fast mode speed calculate: Tlow/Thigh = 16/9 */
+ result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 25));
+ /* Set DUTY bit */
+ result |= I2C_DutyCycle_16_9;
+ }
+
+ /* Test if CCR value is under 0x1*/
+ if ((result & CCR_CCR_Set) == 0)
+ {
+ /* Set minimum allowed value */
+ result |= (uint16_t)0x0001;
+ }
+ /* Set speed value and set F/S bit for fast mode */
+ tmpreg |= (uint16_t)(result | CCR_FS_Set);
+ /* Set Maximum Rise Time for fast mode */
+ I2Cx->TRISE = (uint16_t)(((freqrange * (uint16_t)300) / (uint16_t)1000) + (uint16_t)1);
+ }
+
+ /* Write to I2Cx CCR */
+ I2Cx->CCR = tmpreg;
+ /* Enable the selected I2C peripheral */
+ I2Cx->CR1 |= CR1_PE_Set;
+
+/*---------------------------- I2Cx CR1 Configuration ------------------------*/
+ /* Get the I2Cx CR1 value */
+ tmpreg = I2Cx->CR1;
+ /* Clear ACK, SMBTYPE and SMBUS bits */
+ tmpreg &= CR1_CLEAR_Mask;
+ /* Configure I2Cx: mode and acknowledgement */
+ /* Set SMBTYPE and SMBUS bits according to I2C_Mode value */
+ /* Set ACK bit according to I2C_Ack value */
+ tmpreg |= (uint16_t)((uint32_t)I2C_InitStruct->I2C_Mode | I2C_InitStruct->I2C_Ack);
+ /* Write to I2Cx CR1 */
+ I2Cx->CR1 = tmpreg;
+
+/*---------------------------- I2Cx OAR1 Configuration -----------------------*/
+ /* Set I2Cx Own Address1 and acknowledged address */
+ I2Cx->OAR1 = (I2C_InitStruct->I2C_AcknowledgedAddress | I2C_InitStruct->I2C_OwnAddress1);
+}
+
+/**
+ * @brief Fills each I2C_InitStruct member with its default value.
+ * @param I2C_InitStruct: pointer to an I2C_InitTypeDef structure which will be initialized.
+ * @retval None
+ */
+void I2C_StructInit(I2C_InitTypeDef* I2C_InitStruct)
+{
+/*---------------- Reset I2C init structure parameters values ----------------*/
+ /* initialize the I2C_ClockSpeed member */
+ I2C_InitStruct->I2C_ClockSpeed = 5000;
+ /* Initialize the I2C_Mode member */
+ I2C_InitStruct->I2C_Mode = I2C_Mode_I2C;
+ /* Initialize the I2C_DutyCycle member */
+ I2C_InitStruct->I2C_DutyCycle = I2C_DutyCycle_2;
+ /* Initialize the I2C_OwnAddress1 member */
+ I2C_InitStruct->I2C_OwnAddress1 = 0;
+ /* Initialize the I2C_Ack member */
+ I2C_InitStruct->I2C_Ack = I2C_Ack_Disable;
+ /* Initialize the I2C_AcknowledgedAddress member */
+ I2C_InitStruct->I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
+}
+
+/**
+ * @brief Enables or disables the specified I2C peripheral.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param NewState: new state of the I2Cx peripheral.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void I2C_Cmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Enable the selected I2C peripheral */
+ I2Cx->CR1 |= CR1_PE_Set;
+ }
+ else
+ {
+ /* Disable the selected I2C peripheral */
+ I2Cx->CR1 &= CR1_PE_Reset;
+ }
+}
+
+/**
+ * @brief Enables or disables the specified I2C DMA requests.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param NewState: new state of the I2C DMA transfer.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void I2C_DMACmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Enable the selected I2C DMA requests */
+ I2Cx->CR2 |= CR2_DMAEN_Set;
+ }
+ else
+ {
+ /* Disable the selected I2C DMA requests */
+ I2Cx->CR2 &= CR2_DMAEN_Reset;
+ }
+}
+
+/**
+ * @brief Specifies if the next DMA transfer will be the last one.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param NewState: new state of the I2C DMA last transfer.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void I2C_DMALastTransferCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Next DMA transfer is the last transfer */
+ I2Cx->CR2 |= CR2_LAST_Set;
+ }
+ else
+ {
+ /* Next DMA transfer is not the last transfer */
+ I2Cx->CR2 &= CR2_LAST_Reset;
+ }
+}
+
+/**
+ * @brief Generates I2Cx communication START condition.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param NewState: new state of the I2C START condition generation.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None.
+ */
+void I2C_GenerateSTART(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Generate a START condition */
+ I2Cx->CR1 |= CR1_START_Set;
+ }
+ else
+ {
+ /* Disable the START condition generation */
+ I2Cx->CR1 &= CR1_START_Reset;
+ }
+}
+
+/**
+ * @brief Generates I2Cx communication STOP condition.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param NewState: new state of the I2C STOP condition generation.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None.
+ */
+void I2C_GenerateSTOP(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Generate a STOP condition */
+ I2Cx->CR1 |= CR1_STOP_Set;
+ }
+ else
+ {
+ /* Disable the STOP condition generation */
+ I2Cx->CR1 &= CR1_STOP_Reset;
+ }
+}
+
+/**
+ * @brief Enables or disables the specified I2C acknowledge feature.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param NewState: new state of the I2C Acknowledgement.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None.
+ */
+void I2C_AcknowledgeConfig(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Enable the acknowledgement */
+ I2Cx->CR1 |= CR1_ACK_Set;
+ }
+ else
+ {
+ /* Disable the acknowledgement */
+ I2Cx->CR1 &= CR1_ACK_Reset;
+ }
+}
+
+/**
+ * @brief Configures the specified I2C own address2.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param Address: specifies the 7bit I2C own address2.
+ * @retval None.
+ */
+void I2C_OwnAddress2Config(I2C_TypeDef* I2Cx, uint8_t Address)
+{
+ uint16_t tmpreg = 0;
+
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+
+ /* Get the old register value */
+ tmpreg = I2Cx->OAR2;
+
+ /* Reset I2Cx Own address2 bit [7:1] */
+ tmpreg &= OAR2_ADD2_Reset;
+
+ /* Set I2Cx Own address2 */
+ tmpreg |= (uint16_t)((uint16_t)Address & (uint16_t)0x00FE);
+
+ /* Store the new register value */
+ I2Cx->OAR2 = tmpreg;
+}
+
+/**
+ * @brief Enables or disables the specified I2C dual addressing mode.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param NewState: new state of the I2C dual addressing mode.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void I2C_DualAddressCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Enable dual addressing mode */
+ I2Cx->OAR2 |= OAR2_ENDUAL_Set;
+ }
+ else
+ {
+ /* Disable dual addressing mode */
+ I2Cx->OAR2 &= OAR2_ENDUAL_Reset;
+ }
+}
+
+/**
+ * @brief Enables or disables the specified I2C general call feature.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param NewState: new state of the I2C General call.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void I2C_GeneralCallCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Enable generall call */
+ I2Cx->CR1 |= CR1_ENGC_Set;
+ }
+ else
+ {
+ /* Disable generall call */
+ I2Cx->CR1 &= CR1_ENGC_Reset;
+ }
+}
+
+/**
+ * @brief Enables or disables the specified I2C interrupts.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param I2C_IT: specifies the I2C interrupts sources to be enabled or disabled.
+ * This parameter can be any combination of the following values:
+ * @arg I2C_IT_BUF: Buffer interrupt mask
+ * @arg I2C_IT_EVT: Event interrupt mask
+ * @arg I2C_IT_ERR: Error interrupt mask
+ * @param NewState: new state of the specified I2C interrupts.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void I2C_ITConfig(I2C_TypeDef* I2Cx, uint16_t I2C_IT, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ assert_param(IS_I2C_CONFIG_IT(I2C_IT));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the selected I2C interrupts */
+ I2Cx->CR2 |= I2C_IT;
+ }
+ else
+ {
+ /* Disable the selected I2C interrupts */
+ I2Cx->CR2 &= (uint16_t)~I2C_IT;
+ }
+}
+
+/**
+ * @brief Sends a data byte through the I2Cx peripheral.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param Data: Byte to be transmitted..
+ * @retval None
+ */
+void I2C_SendData(I2C_TypeDef* I2Cx, uint8_t Data)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ /* Write in the DR register the data to be sent */
+ I2Cx->DR = Data;
+}
+
+/**
+ * @brief Returns the most recent received data by the I2Cx peripheral.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @retval The value of the received data.
+ */
+uint8_t I2C_ReceiveData(I2C_TypeDef* I2Cx)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ /* Return the data in the DR register */
+ return (uint8_t)I2Cx->DR;
+}
+
+/**
+ * @brief Transmits the address byte to select the slave device.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param Address: specifies the slave address which will be transmitted
+ * @param I2C_Direction: specifies whether the I2C device will be a
+ * Transmitter or a Receiver. This parameter can be one of the following values
+ * @arg I2C_Direction_Transmitter: Transmitter mode
+ * @arg I2C_Direction_Receiver: Receiver mode
+ * @retval None.
+ */
+void I2C_Send7bitAddress(I2C_TypeDef* I2Cx, uint8_t Address, uint8_t I2C_Direction)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_I2C_DIRECTION(I2C_Direction));
+ /* Test on the direction to set/reset the read/write bit */
+ if (I2C_Direction != I2C_Direction_Transmitter)
+ {
+ /* Set the address bit0 for read */
+ Address |= OAR1_ADD0_Set;
+ }
+ else
+ {
+ /* Reset the address bit0 for write */
+ Address &= OAR1_ADD0_Reset;
+ }
+ /* Send the address */
+ I2Cx->DR = Address;
+}
+
+/**
+ * @brief Reads the specified I2C register and returns its value.
+ * @param I2C_Register: specifies the register to read.
+ * This parameter can be one of the following values:
+ * @arg I2C_Register_CR1: CR1 register.
+ * @arg I2C_Register_CR2: CR2 register.
+ * @arg I2C_Register_OAR1: OAR1 register.
+ * @arg I2C_Register_OAR2: OAR2 register.
+ * @arg I2C_Register_DR: DR register.
+ * @arg I2C_Register_SR1: SR1 register.
+ * @arg I2C_Register_SR2: SR2 register.
+ * @arg I2C_Register_CCR: CCR register.
+ * @arg I2C_Register_TRISE: TRISE register.
+ * @retval The value of the read register.
+ */
+uint16_t I2C_ReadRegister(I2C_TypeDef* I2Cx, uint8_t I2C_Register)
+{
+ __IO uint32_t tmp = 0;
+
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_I2C_REGISTER(I2C_Register));
+
+ tmp = (uint32_t) I2Cx;
+ tmp += I2C_Register;
+
+ /* Return the selected register value */
+ return (*(__IO uint16_t *) tmp);
+}
+
+/**
+ * @brief Enables or disables the specified I2C software reset.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param NewState: new state of the I2C software reset.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void I2C_SoftwareResetCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Peripheral under reset */
+ I2Cx->CR1 |= CR1_SWRST_Set;
+ }
+ else
+ {
+ /* Peripheral not under reset */
+ I2Cx->CR1 &= CR1_SWRST_Reset;
+ }
+}
+
+/**
+ * @brief Selects the specified I2C NACK position in master receiver mode.
+ * This function is useful in I2C Master Receiver mode when the number
+ * of data to be received is equal to 2. In this case, this function
+ * should be called (with parameter I2C_NACKPosition_Next) before data
+ * reception starts,as described in the 2-byte reception procedure
+ * recommended in Reference Manual in Section: Master receiver.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param I2C_NACKPosition: specifies the NACK position.
+ * This parameter can be one of the following values:
+ * @arg I2C_NACKPosition_Next: indicates that the next byte will be the last
+ * received byte.
+ * @arg I2C_NACKPosition_Current: indicates that current byte is the last
+ * received byte.
+ *
+ * @note This function configures the same bit (POS) as I2C_PECPositionConfig()
+ * but is intended to be used in I2C mode while I2C_PECPositionConfig()
+ * is intended to used in SMBUS mode.
+ *
+ * @retval None
+ */
+void I2C_NACKPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_NACKPosition)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_I2C_NACK_POSITION(I2C_NACKPosition));
+
+ /* Check the input parameter */
+ if (I2C_NACKPosition == I2C_NACKPosition_Next)
+ {
+ /* Next byte in shift register is the last received byte */
+ I2Cx->CR1 |= I2C_NACKPosition_Next;
+ }
+ else
+ {
+ /* Current byte in shift register is the last received byte */
+ I2Cx->CR1 &= I2C_NACKPosition_Current;
+ }
+}
+
+/**
+ * @brief Drives the SMBusAlert pin high or low for the specified I2C.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param I2C_SMBusAlert: specifies SMBAlert pin level.
+ * This parameter can be one of the following values:
+ * @arg I2C_SMBusAlert_Low: SMBAlert pin driven low
+ * @arg I2C_SMBusAlert_High: SMBAlert pin driven high
+ * @retval None
+ */
+void I2C_SMBusAlertConfig(I2C_TypeDef* I2Cx, uint16_t I2C_SMBusAlert)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_I2C_SMBUS_ALERT(I2C_SMBusAlert));
+ if (I2C_SMBusAlert == I2C_SMBusAlert_Low)
+ {
+ /* Drive the SMBusAlert pin Low */
+ I2Cx->CR1 |= I2C_SMBusAlert_Low;
+ }
+ else
+ {
+ /* Drive the SMBusAlert pin High */
+ I2Cx->CR1 &= I2C_SMBusAlert_High;
+ }
+}
+
+/**
+ * @brief Enables or disables the specified I2C PEC transfer.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param NewState: new state of the I2C PEC transmission.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void I2C_TransmitPEC(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Enable the selected I2C PEC transmission */
+ I2Cx->CR1 |= CR1_PEC_Set;
+ }
+ else
+ {
+ /* Disable the selected I2C PEC transmission */
+ I2Cx->CR1 &= CR1_PEC_Reset;
+ }
+}
+
+/**
+ * @brief Selects the specified I2C PEC position.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param I2C_PECPosition: specifies the PEC position.
+ * This parameter can be one of the following values:
+ * @arg I2C_PECPosition_Next: indicates that the next byte is PEC
+ * @arg I2C_PECPosition_Current: indicates that current byte is PEC
+ *
+ * @note This function configures the same bit (POS) as I2C_NACKPositionConfig()
+ * but is intended to be used in SMBUS mode while I2C_NACKPositionConfig()
+ * is intended to used in I2C mode.
+ *
+ * @retval None
+ */
+void I2C_PECPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_PECPosition)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_I2C_PEC_POSITION(I2C_PECPosition));
+ if (I2C_PECPosition == I2C_PECPosition_Next)
+ {
+ /* Next byte in shift register is PEC */
+ I2Cx->CR1 |= I2C_PECPosition_Next;
+ }
+ else
+ {
+ /* Current byte in shift register is PEC */
+ I2Cx->CR1 &= I2C_PECPosition_Current;
+ }
+}
+
+/**
+ * @brief Enables or disables the PEC value calculation of the transferred bytes.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param NewState: new state of the I2Cx PEC value calculation.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void I2C_CalculatePEC(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Enable the selected I2C PEC calculation */
+ I2Cx->CR1 |= CR1_ENPEC_Set;
+ }
+ else
+ {
+ /* Disable the selected I2C PEC calculation */
+ I2Cx->CR1 &= CR1_ENPEC_Reset;
+ }
+}
+
+/**
+ * @brief Returns the PEC value for the specified I2C.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @retval The PEC value.
+ */
+uint8_t I2C_GetPEC(I2C_TypeDef* I2Cx)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ /* Return the selected I2C PEC value */
+ return ((I2Cx->SR2) >> 8);
+}
+
+/**
+ * @brief Enables or disables the specified I2C ARP.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param NewState: new state of the I2Cx ARP.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void I2C_ARPCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Enable the selected I2C ARP */
+ I2Cx->CR1 |= CR1_ENARP_Set;
+ }
+ else
+ {
+ /* Disable the selected I2C ARP */
+ I2Cx->CR1 &= CR1_ENARP_Reset;
+ }
+}
+
+/**
+ * @brief Enables or disables the specified I2C Clock stretching.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param NewState: new state of the I2Cx Clock stretching.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void I2C_StretchClockCmd(I2C_TypeDef* I2Cx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState == DISABLE)
+ {
+ /* Enable the selected I2C Clock stretching */
+ I2Cx->CR1 |= CR1_NOSTRETCH_Set;
+ }
+ else
+ {
+ /* Disable the selected I2C Clock stretching */
+ I2Cx->CR1 &= CR1_NOSTRETCH_Reset;
+ }
+}
+
+/**
+ * @brief Selects the specified I2C fast mode duty cycle.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param I2C_DutyCycle: specifies the fast mode duty cycle.
+ * This parameter can be one of the following values:
+ * @arg I2C_DutyCycle_2: I2C fast mode Tlow/Thigh = 2
+ * @arg I2C_DutyCycle_16_9: I2C fast mode Tlow/Thigh = 16/9
+ * @retval None
+ */
+void I2C_FastModeDutyCycleConfig(I2C_TypeDef* I2Cx, uint16_t I2C_DutyCycle)
+{
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_I2C_DUTY_CYCLE(I2C_DutyCycle));
+ if (I2C_DutyCycle != I2C_DutyCycle_16_9)
+ {
+ /* I2C fast mode Tlow/Thigh=2 */
+ I2Cx->CCR &= I2C_DutyCycle_2;
+ }
+ else
+ {
+ /* I2C fast mode Tlow/Thigh=16/9 */
+ I2Cx->CCR |= I2C_DutyCycle_16_9;
+ }
+}
+
+
+
+/**
+ * @brief
+ ****************************************************************************************
+ *
+ * I2C State Monitoring Functions
+ *
+ ****************************************************************************************
+ * This I2C driver provides three different ways for I2C state monitoring
+ * depending on the application requirements and constraints:
+ *
+ *
+ * 1) Basic state monitoring:
+ * Using I2C_CheckEvent() function:
+ * It compares the status registers (SR1 and SR2) content to a given event
+ * (can be the combination of one or more flags).
+ * It returns SUCCESS if the current status includes the given flags
+ * and returns ERROR if one or more flags are missing in the current status.
+ * - When to use:
+ * - This function is suitable for most applications as well as for startup
+ * activity since the events are fully described in the product reference manual
+ * (RM0008).
+ * - It is also suitable for users who need to define their own events.
+ * - Limitations:
+ * - If an error occurs (ie. error flags are set besides to the monitored flags),
+ * the I2C_CheckEvent() function may return SUCCESS despite the communication
+ * hold or corrupted real state.
+ * In this case, it is advised to use error interrupts to monitor the error
+ * events and handle them in the interrupt IRQ handler.
+ *
+ * @note
+ * For error management, it is advised to use the following functions:
+ * - I2C_ITConfig() to configure and enable the error interrupts (I2C_IT_ERR).
+ * - I2Cx_ER_IRQHandler() which is called when the error interrupt occurs.
+ * Where x is the peripheral instance (I2C1, I2C2 ...)
+ * - I2C_GetFlagStatus() or I2C_GetITStatus() to be called into I2Cx_ER_IRQHandler()
+ * in order to determine which error occured.
+ * - I2C_ClearFlag() or I2C_ClearITPendingBit() and/or I2C_SoftwareResetCmd()
+ * and/or I2C_GenerateStop() in order to clear the error flag and source,
+ * and return to correct communication status.
+ *
+ *
+ * 2) Advanced state monitoring:
+ * Using the function I2C_GetLastEvent() which returns the image of both status
+ * registers in a single word (uint32_t) (Status Register 2 value is shifted left
+ * by 16 bits and concatenated to Status Register 1).
+ * - When to use:
+ * - This function is suitable for the same applications above but it allows to
+ * overcome the mentioned limitation of I2C_GetFlagStatus() function.
+ * The returned value could be compared to events already defined in the
+ * library (stm32f10x_i2c.h) or to custom values defined by user.
+ * - This function is suitable when multiple flags are monitored at the same time.
+ * - At the opposite of I2C_CheckEvent() function, this function allows user to
+ * choose when an event is accepted (when all events flags are set and no
+ * other flags are set or just when the needed flags are set like
+ * I2C_CheckEvent() function).
+ * - Limitations:
+ * - User may need to define his own events.
+ * - Same remark concerning the error management is applicable for this
+ * function if user decides to check only regular communication flags (and
+ * ignores error flags).
+ *
+ *
+ * 3) Flag-based state monitoring:
+ * Using the function I2C_GetFlagStatus() which simply returns the status of
+ * one single flag (ie. I2C_FLAG_RXNE ...).
+ * - When to use:
+ * - This function could be used for specific applications or in debug phase.
+ * - It is suitable when only one flag checking is needed (most I2C events
+ * are monitored through multiple flags).
+ * - Limitations:
+ * - When calling this function, the Status register is accessed. Some flags are
+ * cleared when the status register is accessed. So checking the status
+ * of one Flag, may clear other ones.
+ * - Function may need to be called twice or more in order to monitor one
+ * single event.
+ *
+ * For detailed description of Events, please refer to section I2C_Events in
+ * stm32f10x_i2c.h file.
+ *
+ */
+
+/**
+ *
+ * 1) Basic state monitoring
+ *******************************************************************************
+ */
+
+/**
+ * @brief Checks whether the last I2Cx Event is equal to the one passed
+ * as parameter.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param I2C_EVENT: specifies the event to be checked.
+ * This parameter can be one of the following values:
+ * @arg I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED : EV1
+ * @arg I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED : EV1
+ * @arg I2C_EVENT_SLAVE_TRANSMITTER_SECONDADDRESS_MATCHED : EV1
+ * @arg I2C_EVENT_SLAVE_RECEIVER_SECONDADDRESS_MATCHED : EV1
+ * @arg I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED : EV1
+ * @arg I2C_EVENT_SLAVE_BYTE_RECEIVED : EV2
+ * @arg (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_DUALF) : EV2
+ * @arg (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_GENCALL) : EV2
+ * @arg I2C_EVENT_SLAVE_BYTE_TRANSMITTED : EV3
+ * @arg (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_DUALF) : EV3
+ * @arg (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_GENCALL) : EV3
+ * @arg I2C_EVENT_SLAVE_ACK_FAILURE : EV3_2
+ * @arg I2C_EVENT_SLAVE_STOP_DETECTED : EV4
+ * @arg I2C_EVENT_MASTER_MODE_SELECT : EV5
+ * @arg I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED : EV6
+ * @arg I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED : EV6
+ * @arg I2C_EVENT_MASTER_BYTE_RECEIVED : EV7
+ * @arg I2C_EVENT_MASTER_BYTE_TRANSMITTING : EV8
+ * @arg I2C_EVENT_MASTER_BYTE_TRANSMITTED : EV8_2
+ * @arg I2C_EVENT_MASTER_MODE_ADDRESS10 : EV9
+ *
+ * @note: For detailed description of Events, please refer to section
+ * I2C_Events in stm32f10x_i2c.h file.
+ *
+ * @retval An ErrorStatus enumeration value:
+ * - SUCCESS: Last event is equal to the I2C_EVENT
+ * - ERROR: Last event is different from the I2C_EVENT
+ */
+ErrorStatus I2C_CheckEvent(I2C_TypeDef* I2Cx, uint32_t I2C_EVENT)
+{
+ uint32_t lastevent = 0;
+ uint32_t flag1 = 0, flag2 = 0;
+ ErrorStatus status = ERROR;
+
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_I2C_EVENT(I2C_EVENT));
+
+ /* Read the I2Cx status register */
+ flag1 = I2Cx->SR1;
+ flag2 = I2Cx->SR2;
+ flag2 = flag2 << 16;
+
+ /* Get the last event value from I2C status register */
+ lastevent = (flag1 | flag2) & FLAG_Mask;
+
+ /* Check whether the last event contains the I2C_EVENT */
+ if ((lastevent & I2C_EVENT) == I2C_EVENT)
+ {
+ /* SUCCESS: last event is equal to I2C_EVENT */
+ status = SUCCESS;
+ }
+ else
+ {
+ /* ERROR: last event is different from I2C_EVENT */
+ status = ERROR;
+ }
+ /* Return status */
+ return status;
+}
+
+/**
+ *
+ * 2) Advanced state monitoring
+ *******************************************************************************
+ */
+
+/**
+ * @brief Returns the last I2Cx Event.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ *
+ * @note: For detailed description of Events, please refer to section
+ * I2C_Events in stm32f10x_i2c.h file.
+ *
+ * @retval The last event
+ */
+uint32_t I2C_GetLastEvent(I2C_TypeDef* I2Cx)
+{
+ uint32_t lastevent = 0;
+ uint32_t flag1 = 0, flag2 = 0;
+
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+
+ /* Read the I2Cx status register */
+ flag1 = I2Cx->SR1;
+ flag2 = I2Cx->SR2;
+ flag2 = flag2 << 16;
+
+ /* Get the last event value from I2C status register */
+ lastevent = (flag1 | flag2) & FLAG_Mask;
+
+ /* Return status */
+ return lastevent;
+}
+
+/**
+ *
+ * 3) Flag-based state monitoring
+ *******************************************************************************
+ */
+
+/**
+ * @brief Checks whether the specified I2C flag is set or not.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param I2C_FLAG: specifies the flag to check.
+ * This parameter can be one of the following values:
+ * @arg I2C_FLAG_DUALF: Dual flag (Slave mode)
+ * @arg I2C_FLAG_SMBHOST: SMBus host header (Slave mode)
+ * @arg I2C_FLAG_SMBDEFAULT: SMBus default header (Slave mode)
+ * @arg I2C_FLAG_GENCALL: General call header flag (Slave mode)
+ * @arg I2C_FLAG_TRA: Transmitter/Receiver flag
+ * @arg I2C_FLAG_BUSY: Bus busy flag
+ * @arg I2C_FLAG_MSL: Master/Slave flag
+ * @arg I2C_FLAG_SMBALERT: SMBus Alert flag
+ * @arg I2C_FLAG_TIMEOUT: Timeout or Tlow error flag
+ * @arg I2C_FLAG_PECERR: PEC error in reception flag
+ * @arg I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode)
+ * @arg I2C_FLAG_AF: Acknowledge failure flag
+ * @arg I2C_FLAG_ARLO: Arbitration lost flag (Master mode)
+ * @arg I2C_FLAG_BERR: Bus error flag
+ * @arg I2C_FLAG_TXE: Data register empty flag (Transmitter)
+ * @arg I2C_FLAG_RXNE: Data register not empty (Receiver) flag
+ * @arg I2C_FLAG_STOPF: Stop detection flag (Slave mode)
+ * @arg I2C_FLAG_ADD10: 10-bit header sent flag (Master mode)
+ * @arg I2C_FLAG_BTF: Byte transfer finished flag
+ * @arg I2C_FLAG_ADDR: Address sent flag (Master mode) "ADSL"
+ * Address matched flag (Slave mode)"ENDA"
+ * @arg I2C_FLAG_SB: Start bit flag (Master mode)
+ * @retval The new state of I2C_FLAG (SET or RESET).
+ */
+FlagStatus I2C_GetFlagStatus(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG)
+{
+ FlagStatus bitstatus = RESET;
+ __IO uint32_t i2creg = 0, i2cxbase = 0;
+
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_I2C_GET_FLAG(I2C_FLAG));
+
+ /* Get the I2Cx peripheral base address */
+ i2cxbase = (uint32_t)I2Cx;
+
+ /* Read flag register index */
+ i2creg = I2C_FLAG >> 28;
+
+ /* Get bit[23:0] of the flag */
+ I2C_FLAG &= FLAG_Mask;
+
+ if(i2creg != 0)
+ {
+ /* Get the I2Cx SR1 register address */
+ i2cxbase += 0x14;
+ }
+ else
+ {
+ /* Flag in I2Cx SR2 Register */
+ I2C_FLAG = (uint32_t)(I2C_FLAG >> 16);
+ /* Get the I2Cx SR2 register address */
+ i2cxbase += 0x18;
+ }
+
+ if(((*(__IO uint32_t *)i2cxbase) & I2C_FLAG) != (uint32_t)RESET)
+ {
+ /* I2C_FLAG is set */
+ bitstatus = SET;
+ }
+ else
+ {
+ /* I2C_FLAG is reset */
+ bitstatus = RESET;
+ }
+
+ /* Return the I2C_FLAG status */
+ return bitstatus;
+}
+
+
+
+/**
+ * @brief Clears the I2Cx's pending flags.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param I2C_FLAG: specifies the flag to clear.
+ * This parameter can be any combination of the following values:
+ * @arg I2C_FLAG_SMBALERT: SMBus Alert flag
+ * @arg I2C_FLAG_TIMEOUT: Timeout or Tlow error flag
+ * @arg I2C_FLAG_PECERR: PEC error in reception flag
+ * @arg I2C_FLAG_OVR: Overrun/Underrun flag (Slave mode)
+ * @arg I2C_FLAG_AF: Acknowledge failure flag
+ * @arg I2C_FLAG_ARLO: Arbitration lost flag (Master mode)
+ * @arg I2C_FLAG_BERR: Bus error flag
+ *
+ * @note
+ * - STOPF (STOP detection) is cleared by software sequence: a read operation
+ * to I2C_SR1 register (I2C_GetFlagStatus()) followed by a write operation
+ * to I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral).
+ * - ADD10 (10-bit header sent) is cleared by software sequence: a read
+ * operation to I2C_SR1 (I2C_GetFlagStatus()) followed by writing the
+ * second byte of the address in DR register.
+ * - BTF (Byte Transfer Finished) is cleared by software sequence: a read
+ * operation to I2C_SR1 register (I2C_GetFlagStatus()) followed by a
+ * read/write to I2C_DR register (I2C_SendData()).
+ * - ADDR (Address sent) is cleared by software sequence: a read operation to
+ * I2C_SR1 register (I2C_GetFlagStatus()) followed by a read operation to
+ * I2C_SR2 register ((void)(I2Cx->SR2)).
+ * - SB (Start Bit) is cleared software sequence: a read operation to I2C_SR1
+ * register (I2C_GetFlagStatus()) followed by a write operation to I2C_DR
+ * register (I2C_SendData()).
+ * @retval None
+ */
+void I2C_ClearFlag(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG)
+{
+ uint32_t flagpos = 0;
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_I2C_CLEAR_FLAG(I2C_FLAG));
+ /* Get the I2C flag position */
+ flagpos = I2C_FLAG & FLAG_Mask;
+ /* Clear the selected I2C flag */
+ I2Cx->SR1 = (uint16_t)~flagpos;
+}
+
+/**
+ * @brief Checks whether the specified I2C interrupt has occurred or not.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param I2C_IT: specifies the interrupt source to check.
+ * This parameter can be one of the following values:
+ * @arg I2C_IT_SMBALERT: SMBus Alert flag
+ * @arg I2C_IT_TIMEOUT: Timeout or Tlow error flag
+ * @arg I2C_IT_PECERR: PEC error in reception flag
+ * @arg I2C_IT_OVR: Overrun/Underrun flag (Slave mode)
+ * @arg I2C_IT_AF: Acknowledge failure flag
+ * @arg I2C_IT_ARLO: Arbitration lost flag (Master mode)
+ * @arg I2C_IT_BERR: Bus error flag
+ * @arg I2C_IT_TXE: Data register empty flag (Transmitter)
+ * @arg I2C_IT_RXNE: Data register not empty (Receiver) flag
+ * @arg I2C_IT_STOPF: Stop detection flag (Slave mode)
+ * @arg I2C_IT_ADD10: 10-bit header sent flag (Master mode)
+ * @arg I2C_IT_BTF: Byte transfer finished flag
+ * @arg I2C_IT_ADDR: Address sent flag (Master mode) "ADSL"
+ * Address matched flag (Slave mode)"ENDAD"
+ * @arg I2C_IT_SB: Start bit flag (Master mode)
+ * @retval The new state of I2C_IT (SET or RESET).
+ */
+ITStatus I2C_GetITStatus(I2C_TypeDef* I2Cx, uint32_t I2C_IT)
+{
+ ITStatus bitstatus = RESET;
+ uint32_t enablestatus = 0;
+
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_I2C_GET_IT(I2C_IT));
+
+ /* Check if the interrupt source is enabled or not */
+ enablestatus = (uint32_t)(((I2C_IT & ITEN_Mask) >> 16) & (I2Cx->CR2)) ;
+
+ /* Get bit[23:0] of the flag */
+ I2C_IT &= FLAG_Mask;
+
+ /* Check the status of the specified I2C flag */
+ if (((I2Cx->SR1 & I2C_IT) != (uint32_t)RESET) && enablestatus)
+ {
+ /* I2C_IT is set */
+ bitstatus = SET;
+ }
+ else
+ {
+ /* I2C_IT is reset */
+ bitstatus = RESET;
+ }
+ /* Return the I2C_IT status */
+ return bitstatus;
+}
+
+/**
+ * @brief Clears the I2Cx�s interrupt pending bits.
+ * @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
+ * @param I2C_IT: specifies the interrupt pending bit to clear.
+ * This parameter can be any combination of the following values:
+ * @arg I2C_IT_SMBALERT: SMBus Alert interrupt
+ * @arg I2C_IT_TIMEOUT: Timeout or Tlow error interrupt
+ * @arg I2C_IT_PECERR: PEC error in reception interrupt
+ * @arg I2C_IT_OVR: Overrun/Underrun interrupt (Slave mode)
+ * @arg I2C_IT_AF: Acknowledge failure interrupt
+ * @arg I2C_IT_ARLO: Arbitration lost interrupt (Master mode)
+ * @arg I2C_IT_BERR: Bus error interrupt
+ *
+ * @note
+ * - STOPF (STOP detection) is cleared by software sequence: a read operation
+ * to I2C_SR1 register (I2C_GetITStatus()) followed by a write operation to
+ * I2C_CR1 register (I2C_Cmd() to re-enable the I2C peripheral).
+ * - ADD10 (10-bit header sent) is cleared by software sequence: a read
+ * operation to I2C_SR1 (I2C_GetITStatus()) followed by writing the second
+ * byte of the address in I2C_DR register.
+ * - BTF (Byte Transfer Finished) is cleared by software sequence: a read
+ * operation to I2C_SR1 register (I2C_GetITStatus()) followed by a
+ * read/write to I2C_DR register (I2C_SendData()).
+ * - ADDR (Address sent) is cleared by software sequence: a read operation to
+ * I2C_SR1 register (I2C_GetITStatus()) followed by a read operation to
+ * I2C_SR2 register ((void)(I2Cx->SR2)).
+ * - SB (Start Bit) is cleared by software sequence: a read operation to
+ * I2C_SR1 register (I2C_GetITStatus()) followed by a write operation to
+ * I2C_DR register (I2C_SendData()).
+ * @retval None
+ */
+void I2C_ClearITPendingBit(I2C_TypeDef* I2Cx, uint32_t I2C_IT)
+{
+ uint32_t flagpos = 0;
+ /* Check the parameters */
+ assert_param(IS_I2C_ALL_PERIPH(I2Cx));
+ assert_param(IS_I2C_CLEAR_IT(I2C_IT));
+ /* Get the I2C flag position */
+ flagpos = I2C_IT & FLAG_Mask;
+ /* Clear the selected I2C flag */
+ I2Cx->SR1 = (uint16_t)~flagpos;
+}
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
--
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