/****************************************************************************
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* Copyright: (C)2014 Î人ÁèÔÆǶÈëʽʵÑéÊÒ www.emblinux.com
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* Author: GuoWenxue<guowenxue@gmail.com> QQ: 281143292
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* Description: ·Ü¶·STM32v5¿ª·¢°åGPIOÄ£ÄâÉãÏñÍ·SCCB(Serial Camera Control Bus)µÄʵÏÖ,
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* SCCBµÄ¹¤×÷·½Ê½ÓëI2CÊ®·ÖÀàËÆ£¬ËûʹÓÃOV¹«Ë¾¶¨ÒåµÄ3Ïß´®ÐÐÉãÏñÍ·¿ØÖÆ×ÜÏߣ¬
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* ¿ÉÒÔ¿ØÖƴ󲿷ÖOVϵÁÐͼÐδ«¸ÐÆ÷¡£SCCBÒ²¿ÉÒÔ¹¤×÷ÔÚ2Ïß´®ÐÐģʽ(SIOCÓëSIOD).
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* STM32ÉÏʹÓÃPE2ºÍPE3·Ö±ðÁ¬½ÓOV7670µÄSCCBʱÖÓ¿ÚºÍÊý¾Ý¿Ú,¸Ã´úÂëÖ÷ҪʹÓÃ
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* PE2ºÍPE3µÄGPIO¿ÚÄ£ÄâSCCB(Ò²¼´I2C)×ÜÏßÐÒé
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*
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* ChangeLog:
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* °æ±¾ºÅ ÈÕÆÚ ×÷Õß ËµÃ÷
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* V1.0.0 2014.08.25 GuoWenxue ·¢²¼¸Ã°æ±¾
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****************************************************************************/
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/* CF7670C-V3ÉãÏñÍ·Ä£¿éPin¹Ü½ÅºÍSTM32v5 Á¬½Ó±í:
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*| ²Î¿¼<CF7670C-V3 ¼òҪ˵Ã÷.pdf>ºÍ<·Ü¶·STM32¿ª·¢°åV5ÔÀíͼ.pdf>
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*+---------------------------------------+------------------------------+
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*| CF7670C-V3ÉãÏñÍ·Ä£¿éÒý½Å¼°ËµÃ÷ | STM32¶ËÒý½ÅÁ¬½Ó¼°ËµÃ÷ |
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*+---------------------------------------+------------------------------+
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*| Pin1-VCC(3.3V,·½º¸Å̱ê¼ÇµÄΪµÚÒ»½Å) | 3.3V |
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*| Pin2-GND | GND |
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*| Pin3-SCL(SCCB_SCL²»´øÉÏÀµç×è) | PE2 |
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*| Pin4-SDA(SCCB_SDA ´ø4.7KÉÏÀµç×è) | PE3 |
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*| Pin5-VSYNC(OV7670 ֡ͬ²½ÐźÅ) | PE4 |
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*| Pin6-HREF(OV7670 ÐÐͬ²½ÐźÅ) | NC |
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*| Pin7-WEN(FIFO(AL422)дÔÊÐí,¸ßµçƽÓÐЧ | PE5 |
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*| Pin8-XCLK(NC/RE# ¿Õ½Å) | NC |
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*| Pin9-RRST(FIFO¶ÁµØÖ·¸´Î» | PE6 |
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*| Pin10-OE#(FIFOÊý¾ÝÊä³öʹÄÜ,µÍµçƽÓÐЧ | GND |
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*| Pin11-RCK#(FIFO¶ÁÊý¾ÝʱÖÓ | PD12 |
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*| Pin12-GND | GND |
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*| | |
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*| Pin13-D0 FIFOÊý¾Ý¿ÚÊä³öBIT0 | PC0 |
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*| Pin14-D1 FIFOÊý¾Ý¿ÚÊä³öBIT1 | PC1 |
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*| Pin15-D2 FIFOÊý¾Ý¿ÚÊä³öBIT2 | PC2 |
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*| Pin16-D3 FIFOÊý¾Ý¿ÚÊä³öBIT3 | PC3 |
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*| Pin17-D4 FIFOÊý¾Ý¿ÚÊä³öBIT4 | PC4 |
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*| Pin18-D5 FIFOÊý¾Ý¿ÚÊä³öBIT5 | PC5 |
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*| Pin19-D6 FIFOÊý¾Ý¿ÚÊä³öBIT6 | PC6 |
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*| Pin20-D7 FIFOÊý¾Ý¿ÚÊä³öBIT7 | PC7 |
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*+------------------+-----------------+---------------------------------+
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*/
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#include "stm32v5_sccb.h"
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/* ÅäÖÃÁ¬½ÓOV7670µÄSCCB_SCL(PE2)ºÍSCCB_SDA(PE3)ΪGPIOģʽģÄâ*/
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void init_sccb_gpio(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE, ENABLE);
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/* Configure I2C pins: PE2->SCL and PE3->SDA */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 ;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode =GPIO_Mode_Out_PP ;//
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GPIO_Init(GPIOE, &GPIO_InitStructure);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP ;
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GPIO_Init(GPIOE, &GPIO_InitStructure);
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}
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/* I2C ×ÜÏßʱÖÓÑÓʱº¯Êý */
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static void I2C_delay(void)
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{
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unsigned short i = 200; /* ÕâÀï¿ÉÒÔÓÅ»¯ËÙ¶È */
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while(i)
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{
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i--;
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}
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}
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/* I2C×ÜÏß¿ªÊ¼ÐźŠ*/
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static int I2C_Start(void)
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{
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SDA_H;
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I2C_delay();
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SCL_H;
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I2C_delay();
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SDA_L;
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I2C_delay();
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SCL_L;
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I2C_delay();
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return ENABLE;
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}
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/* I2C×ÜÏßÍ£Ö¹ÐźŠ*/
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static void I2C_Stop(void)
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{
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SDA_L;
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I2C_delay();
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SCL_H;
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I2C_delay();
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SDA_H;
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I2C_delay();
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}
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/* I2C×ÜÏßSDAÊäÈë */
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void I2C_IN(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOE, ENABLE);
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD; //GPIO_Mode_Out_OD;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_Init(GPIOE, &GPIO_InitStructure);
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}
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/* I2C×ÜÏßSDAÊä³ö */
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void I2C_OUT(void)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode =GPIO_Mode_Out_PP ;//
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GPIO_Init(GPIOE, &GPIO_InitStructure);
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}
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/* I2C×ÜÏßACKÐźŠ*/
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static void I2C_Ack(void)
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{
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SCL_L;
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I2C_delay();
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SDA_L;
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I2C_delay();
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SCL_H;
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I2C_delay();
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SCL_L;
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I2C_delay();
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}
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/* I2C×ÜÏßNAKÐźŠ*/
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static void I2C_NoAck(void)
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{
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SDA_H;
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I2C_delay();
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SCL_H;
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I2C_delay();
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SCL_L;
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I2C_delay();
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SDA_L;
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I2C_delay();
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}
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/* I2C×ÜÏߵȴýACKÐźŠ*/
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static int I2C_WaitAck(void)
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{
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I2C_IN();
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I2C_delay();
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SCL_H;
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I2C_delay();
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if(SDA_read)
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{
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SCL_L;
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return DISABLE;
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}
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SCL_L;
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I2C_delay();
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I2C_OUT();
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I2C_delay();
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return ENABLE;
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}
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/* I2C×ÜÏß·¢ËÍÒ»¸ö×Ö½ÚÊý¾Ý, Êý¾Ý´Ó¸ßλµ½µÍλ */
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static void I2C_SendByte(uint8_t SendByte)
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{
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uint8_t i=8;
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while(i--)
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{
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//SCL_L;
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//I2C_delay();
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if(SendByte&0x80)
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SDA_H;
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else
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SDA_L;
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SendByte<<=1;
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I2C_delay();
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SCL_H;
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I2C_delay();
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SCL_L;
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I2C_delay();
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}
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}
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/* I2C×ÜÏß½ÓÊÕÒ»¸ö×Ö½ÚÊý¾Ý, Êý¾Ý´Ó¸ßλµ½µÍλ */
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static int I2C_ReceiveByte(void)
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{
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uint8_t i=8;
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uint8_t ReceiveByte=0;
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SDA_H;
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while(i--)
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{
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ReceiveByte<<=1;
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SCL_L;
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I2C_delay();
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SCL_H;
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I2C_IN();
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I2C_delay();
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if(SDA_read)
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{
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ReceiveByte|=0x01;
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}
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}
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SCL_L;
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I2C_OUT();
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return ReceiveByte;
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}
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/*******************************************************************************
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* Function Name : I2C_WriteByte
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* Description : дһ×Ö½ÚÊý¾Ý
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* Input : - WriteAddress: ´ýдÈëµØÖ·
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* - SendByte: ´ýдÈëÊý¾Ý
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* - DeviceAddress: Æ÷¼þÀàÐÍ
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* Output : None
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* Return : ·µ»ØΪ:=1³É¹¦Ð´Èë,=0ʧ°Ü
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* Attention : None
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*******************************************************************************/
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int I2C_WriteByte( uint16_t WriteAddress , uint8_t SendByte , uint8_t DeviceAddress)
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{
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if(!I2C_Start())
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{
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return DISABLE;
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}
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I2C_delay();
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I2C_SendByte( DeviceAddress ); /* Æ÷¼þµØÖ· */
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if( !I2C_WaitAck() )
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{
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I2C_Stop();
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return DISABLE;
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}
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I2C_delay();
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I2C_SendByte((uint8_t)(WriteAddress & 0x00FF)); /* ÉèÖõÍÆðʼµØÖ· */
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I2C_WaitAck();
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I2C_delay();
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I2C_SendByte(SendByte);
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I2C_WaitAck();
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I2C_delay();
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I2C_Stop();
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I2C_delay();
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return ENABLE;
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}
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/*******************************************************************************
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* Function Name : I2C_ReadByte
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* Description : ¶ÁÈ¡Ò»´®Êý¾Ý
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* Input : - pBuffer: ´æ·Å¶Á³öÊý¾Ý
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* - length: ´ý¶Á³ö³¤¶È
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* - ReadAddress: ´ý¶Á³öµØÖ·
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* - DeviceAddress: Æ÷¼þÀàÐÍ
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* Output : None
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* Return : ·µ»ØΪ:=1³É¹¦¶ÁÈë,=0ʧ°Ü
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* Attention : None
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*******************************************************************************/
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int I2C_ReadByte(uint8_t* pBuffer, uint16_t length, uint8_t ReadAddress, uint8_t DeviceAddress)
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{
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if(!I2C_Start())
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{
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return DISABLE;
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}
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I2C_SendByte( DeviceAddress ); /* Æ÷¼þµØÖ· */
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if( !I2C_WaitAck() )
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{
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I2C_Stop();
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return DISABLE;
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}
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I2C_SendByte( ReadAddress ); /* ÉèÖõÍÆðʼµØÖ· */
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I2C_WaitAck();
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I2C_Stop();
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if(!I2C_Start())
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{
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return DISABLE;
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}
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I2C_SendByte( DeviceAddress + 1 ); /* Æ÷¼þµØÖ· */
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if(!I2C_WaitAck())
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{
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I2C_Stop();
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return DISABLE;
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}
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while(length)
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{
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*pBuffer = I2C_ReceiveByte();
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if(length == 1)
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{
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I2C_NoAck();
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}
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else
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{
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I2C_Ack();
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}
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pBuffer++;
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length--;
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}
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I2C_Stop();
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return ENABLE;
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}
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