STM32 模拟I2C （STM32F051）-白红宇

STM32 模拟I2C （STM32F051）

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发布时间：2019-06-15

本文共 5501 字，大约阅读时间需要 18 分钟。

/**  ******************************************************************************  * @file      i2c simu.c  * @brief     simulation function  * @CPU       STM32F051  * @compiler  Keil uVision V4.74  * @author    MetalSeed  * @copyright WSHHB  * @version   V1.0.0  * @date      18-Sept-2014  * @modifydate20-Sept-2014  ******************************************************************************  * @attention  */#include "boardAPI.h"#include "i2cSimu.h"#include "delay.h"#include "uart.h"GPIO_InitTypeDef        GPIO_InitStructure;       /**  * @brief  IIC Init  * @param  A:  * @retval None  */void IIC_Init(void){					     	RCC_AHBPeriphClockCmd(	RCC_AHBPeriph_GPIOF, ENABLE );		GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT ;   //ÍÆÍìÊä³ö  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;	GPIO_Init(GPIOF, &GPIO_InitStructure);	GPIO_SetBits(GPIOF,GPIO_Pin_6|GPIO_Pin_7); 	//PB10,PB11 Êä³ö¸ß}/**  * @brief  Set SDA Pin as Output Mode  * @retval None  */void SDA_OUT()  {    GPIO_StructInit(&GPIO_InitStructure);    GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_7;    GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_OUT;    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;     GPIO_Init(GPIOF, &GPIO_InitStructure);  }  /**  * @brief  Set SDA Pin as Input Mode  * @retval None  */void SDA_IN()  {    GPIO_StructInit(&GPIO_InitStructure);    GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_7;    GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_IN;  GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_NOPULL;// !!!  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;     GPIO_Init(GPIOF, &GPIO_InitStructure);  } /**  * @brief  read input voltage from SDA pin  * @retval None  */BYTE SDA_READ(){  return GPIO_ReadInputDataBit(GPIOF, GPIO_Pin_7);}/**  * @brief  output high form SDA pin  * @retval None  */void IIC_SDA_1(){  GPIO_SetBits(GPIOF, GPIO_Pin_7);}/**  * @brief  output low form SDA pin  * @retval None  */void IIC_SDA_0(){  GPIO_ResetBits(GPIOF, GPIO_Pin_7);}/**  * @brief  output high form SCL pin  * @retval None  */void IIC_SCL_1(){GPIO_SetBits(GPIOF, GPIO_Pin_6);}/**  * @brief  output LOW form SCL pin  * @retval None  */void IIC_SCL_0(){GPIO_ResetBits(GPIOF, GPIO_Pin_6);  }/*** @brief  Simulate IIC conmunication :Create Start signal  * @retval None  */void IIC_Start(void){	SDA_OUT();     //sda output	IIC_SDA_1();	  	  	IIC_SCL_1();	delayus(4); 	IIC_SDA_0();   //START:when CLK is high,DATA change form high to low 	delayus(4);	IIC_SCL_0();   //hold scl line, prepare to transmit data}	  /**  * @brief  Simulate IIC conmunication : Create Stop signal  * @retval None  */void IIC_Stop(void){	SDA_OUT();    //sda output mode 	IIC_SCL_0();	IIC_SDA_0();  //STOP:when CLK is high DATA change form low to high 	delayus(4);	IIC_SCL_1(); 	IIC_SDA_1();  //indicate transmit over	delayus(4);							   	}/*** @brief  Simulate IIC conmunication : wait for target device's ACK* @retval ACK (0) : receive success* @retval NACK(1) : receive unsuccess  */BYTE IIC_Wait_Ack(void){	BYTE ucErrTime = 0;	SDA_IN();      //set as input mode	IIC_SDA_1();  delayus(1);	   	IIC_SCL_1();  delayus(1);	 	while(SDA_READ())	{		ucErrTime++;		if(ucErrTime > 250)		{			IIC_Stop();			return 1;		}	}	IIC_SCL_0(); //release scl line	return 0;  } /**  * @brief  Simulate IIC conmunication : make an ACK  * @retval None  */void IIC_Ack(void){	IIC_SCL_0();	SDA_OUT();	IIC_SDA_0();	delayus(2);	IIC_SCL_1();	delayus(2);	IIC_SCL_0();}/**  * @brief  Simulate IIC conmunication : don't make an ACK  * @retval None  */void IIC_NAck(void){	IIC_SCL_0();	SDA_OUT();	IIC_SDA_1();	delayus(2);	IIC_SCL_1();	delayus(2);	IIC_SCL_0();}					 				     /**  * @brief  Simulate IIC conmunication : Transmit one byte Data  * @param  txd: data to be transmit  * @retval None  */void IIC_Send_Byte(BYTE txd){                          BYTE i;     SDA_OUT(); 	      IIC_SCL_0();//push down scl  to start transmit data  for(i = 0; i < 8; ++i)  {                  if(txd & 0x80)    {      IIC_SDA_1();    }    else    {      IIC_SDA_0();    }    txd <<= 1; 	      delayus(2);       IIC_SCL_1();    delayus(2);     IIC_SCL_0();	    delayus(2);  }	 } 	  //¶Á1¸ö×Ö½Ú£¬ack=1Ê±£¬·¢ËÍACK£¬ack=0£¬·¢ËÍnACK   /**  * @brief  Simulate IIC conmunication : Receive one byte Data  * @param  ack: Whether transmit ACK  * @retval the data have been receive  */BYTE IIC_Read_Byte(unsigned char ack){	unsigned char i, res = 0;	SDA_IN();               //SDA input mode  for(i = 0; i < 8; ++i )	{    IIC_SCL_0();     delayus(2);    IIC_SCL_1();    res <<= 1;    if(SDA_READ())    {      res++;     }      		delayus(1);   }					   if (!ack)  {    IIC_NAck();//make NACK  }  else  {    IIC_Ack(); //make ACK  }  return res;}/*JUST SOME TEST FUNTION DEMO*/BYTE ReadData(){				  	BYTE temp=0;		  	    																   IIC_Start();  	  IIC_Send_Byte(0x80); 	IIC_Wait_Ack();     IIC_Send_Byte(0xf5); 	IIC_Wait_Ack();	    	  IIC_Start();  	 	   	IIC_Send_Byte(0XA1); 	IIC_Wait_Ack();	     temp=IIC_Read_Byte(0);		     IIC_Stop();	return temp;}void WriteData(BYTE DataToWrite){				   	  	    																   IIC_Start();    IIC_Send_Byte(0x80);  if( IIC_Wait_Ack() == 0)  {     printf("Recieve ACK \n");  }        IIC_Send_Byte(0xf5);	IIC_Wait_Ack(); 	 										  		   	  IIC_Send_Byte( DataToWrite ); 	IIC_Wait_Ack();  		    	       IIC_Stop();	delayms(10);	 }

转载于:https://www.cnblogs.com/gcczhongduan/p/4634037.html

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