/**
|
******************************************************************************
|
* @file stm8s_awu.c
|
* @author MCD Application Team
|
* @version V2.3.0
|
* @date 16-June-2017
|
* @brief This file contains all the functions for the AWU peripheral.
|
******************************************************************************
|
* @attention
|
*
|
* <h2><center>© COPYRIGHT 2014 STMicroelectronics</center></h2>
|
*
|
* Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
|
* You may not use this file except in compliance with the License.
|
* You may obtain a copy of the License at:
|
*
|
* http://www.st.com/software_license_agreement_liberty_v2
|
*
|
* Unless required by applicable law or agreed to in writing, software
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
* See the License for the specific language governing permissions and
|
* limitations under the License.
|
*
|
******************************************************************************
|
*/
|
|
/* Includes ------------------------------------------------------------------*/
|
#include "stm8s_awu.h"
|
|
/** @addtogroup STM8S_StdPeriph_Driver
|
* @{
|
*/
|
/* Private typedef -----------------------------------------------------------*/
|
/* Private define ------------------------------------------------------------*/
|
/* Private macro -------------------------------------------------------------*/
|
/* Private variables ---------------------------------------------------------*/
|
/* Private function prototypes -----------------------------------------------*/
|
/* Private functions ---------------------------------------------------------*/
|
|
/* See also AWU_Timebase_TypeDef structure in stm8s_awu.h file :
|
N 2 5 1 2 4 8 1 3 6 1 2 5 1 2 1 3
|
O 5 0 m m m m 6 2 4 2 5 1 s s 2 0
|
I 0 0 s s s s m m m 8 6 2 s s
|
T u u s s s m m m
|
s s s s s
|
*/
|
/** Contains the different values to write in the APR register (used by AWU_Init function) */
|
CONST uint8_t APR_Array[17] =
|
{
|
0, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 61, 23, 23, 62
|
};
|
|
/** Contains the different values to write in the TBR register (used by AWU_Init function) */
|
CONST uint8_t TBR_Array[17] =
|
{
|
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 12, 14, 15, 15
|
};
|
|
/* Public functions ----------------------------------------------------------*/
|
|
/**
|
* @addtogroup AWU_Public_Functions
|
* @{
|
*/
|
|
/**
|
* @brief Deinitializes the AWU peripheral registers to their default reset
|
* values.
|
* @param None
|
* @retval None
|
*/
|
void AWU_DeInit(void)
|
{
|
AWU->CSR = AWU_CSR_RESET_VALUE;
|
AWU->APR = AWU_APR_RESET_VALUE;
|
AWU->TBR = AWU_TBR_RESET_VALUE;
|
}
|
|
/**
|
* @brief Initializes the AWU peripheral according to the specified parameters.
|
* @param AWU_TimeBase : Time base selection (interval between AWU interrupts).
|
* can be one of the values of @ref AWU_Timebase_TypeDef.
|
* @retval None
|
* @par Required preconditions:
|
* The LS RC calibration must be performed before calling this function.
|
*/
|
void AWU_Init(AWU_Timebase_TypeDef AWU_TimeBase)
|
{
|
/* Check parameter */
|
assert_param(IS_AWU_TIMEBASE_OK(AWU_TimeBase));
|
|
/* Enable the AWU peripheral */
|
AWU->CSR |= AWU_CSR_AWUEN;
|
|
/* Set the TimeBase */
|
AWU->TBR &= (uint8_t)(~AWU_TBR_AWUTB);
|
AWU->TBR |= TBR_Array[(uint8_t)AWU_TimeBase];
|
|
/* Set the APR divider */
|
AWU->APR &= (uint8_t)(~AWU_APR_APR);
|
AWU->APR |= APR_Array[(uint8_t)AWU_TimeBase];
|
}
|
|
/**
|
* @brief Enable or disable the AWU peripheral.
|
* @param NewState Indicates the new state of the AWU peripheral.
|
* @retval None
|
* @par Required preconditions:
|
* Initialisation of AWU and LS RC calibration must be done before.
|
*/
|
void AWU_Cmd(FunctionalState NewState)
|
{
|
if (NewState != DISABLE)
|
{
|
/* Enable the AWU peripheral */
|
AWU->CSR |= AWU_CSR_AWUEN;
|
}
|
else
|
{
|
/* Disable the AWU peripheral */
|
AWU->CSR &= (uint8_t)(~AWU_CSR_AWUEN);
|
}
|
}
|
|
/**
|
* @brief Update APR register with the measured LSI frequency.
|
* @par Note on the APR calculation:
|
* A is the integer part of lsifreqkhz/4 and x the decimal part.
|
* x <= A/(1+2A) is equivalent to A >= x(1+2A) and also to 4A >= 4x(1+2A) [F1]
|
* but we know that A + x = lsifreqkhz/4 ==> 4x = lsifreqkhz-4A
|
* so [F1] can be written :
|
* 4A >= (lsifreqkhz-4A)(1+2A)
|
* @param LSIFreqHz Low Speed RC frequency measured by timer (in Hz).
|
* @retval None
|
* @par Required preconditions:
|
* - AWU must be disabled to avoid unwanted interrupts.
|
*/
|
void AWU_LSICalibrationConfig(uint32_t LSIFreqHz)
|
{
|
uint16_t lsifreqkhz = 0x0;
|
uint16_t A = 0x0;
|
|
/* Check parameter */
|
assert_param(IS_LSI_FREQUENCY_OK(LSIFreqHz));
|
|
lsifreqkhz = (uint16_t)(LSIFreqHz / 1000); /* Converts value in kHz */
|
|
/* Calculation of AWU calibration value */
|
|
A = (uint16_t)(lsifreqkhz >> 2U); /* Division by 4, keep integer part only */
|
|
if ((4U * A) >= ((lsifreqkhz - (4U * A)) * (1U + (2U * A))))
|
{
|
AWU->APR = (uint8_t)(A - 2U);
|
}
|
else
|
{
|
AWU->APR = (uint8_t)(A - 1U);
|
}
|
}
|
|
/**
|
* @brief Configures AWU in Idle mode to reduce power consumption.
|
* @param None
|
* @retval None
|
*/
|
void AWU_IdleModeEnable(void)
|
{
|
/* Disable AWU peripheral */
|
AWU->CSR &= (uint8_t)(~AWU_CSR_AWUEN);
|
|
/* No AWU timebase */
|
AWU->TBR = (uint8_t)(~AWU_TBR_AWUTB);
|
}
|
|
/**
|
* @brief Returns status of the AWU peripheral flag.
|
* @param None
|
* @retval FlagStatus : Status of the AWU flag.
|
* This parameter can be any of the @ref FlagStatus enumeration.
|
*/
|
FlagStatus AWU_GetFlagStatus(void)
|
{
|
return((FlagStatus)(((uint8_t)(AWU->CSR & AWU_CSR_AWUF) == (uint8_t)0x00) ? RESET : SET));
|
}
|
|
|
/**
|
* @}
|
*/
|
|
/**
|
* @}
|
*/
|
|
|
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
|
