STM32模拟IIC

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IIC.h

#ifndef _MD_IIC_h_#define _MD_IIC_h_#include "stm32f10x.h"/* Pin Definiton ---------- */#define IIC_GPIO (GPIOC)#define IIC_GOIO_SDA (GPIOC)#define IIC_GPIO_SCL (GPIOC)#define IIC_SDA (GPIO_Pin_2)#define IIC_SCL (GPIO_Pin_1)//初始化调用IIC_GPIO_Configuration( IIC_GOIO_SDA , IIC_SDA , IIC_GPIO_SCL , IIC_SCL );extern void IIC_GPIO_Configuration( GPIO_TypeDef * GPIOx_SDA , uint16_t SDA_Pin , GPIO_TypeDef * GPIOx_SCL , uint16_t SCL_Pin );//使用软件模拟I2C#define SET_SDA          { GPIO_SetBits  ( IIC_GPIO , IIC_SDA ); }#define RESET_SDA        { GPIO_ResetBits( IIC_GPIO , IIC_SDA ); }#define SET_SCL          { GPIO_SetBits  ( IIC_GPIO , IIC_SCL ); }#define RESET_SCL        { GPIO_ResetBits( IIC_GPIO , IIC_SCL) ; }#define IIC_SDA_STATE    (IIC_GPIO->IDR&IIC_SDA)#define IIC_SCL_STATE    (IIC_GPIO->IDR&IIC_SDA)#define IIC_DELAY        { IIC_Delay(); }enum IIC_REPLAY_ENUM{    IIC_NACK = 0,    IIC_ACK = 1};enum IIC_BUS_STATE_ENUM{    IIC_BUS_READY = 0,    IIC_BUS_BUSY=1,    IIC_BUS_ERROR=2};//IIC 延时extern void IIC_Delay(void);//IIC 启动函数extern u8 IIC_Start(void);//IIC 停止函数extern void IIC_Stop(void);//IIC 发送动作extern void IIC_SendACK(void);//IIC 停止动作extern void IIC_SendNACK(void);//IIC 发送单字节extern u8 IIC_SendByte(u8 Data);//IIC 接收单字节extern u8 IIC_RecvByte(void);//IIC 写入单字节extern void Single_Write_IIC(u8 SlaveAddress,u8 REG_Address,u8 REG_data);//IIC 读取单字节extern u8 Single_Read_IIC(u8 SlaveAddress, u8 REG_Address);//GPIO 过滤器extern uint16_t GPIO_Filter( GPIO_TypeDef * GPIOx );#endif /* _MD_IIC_H_ *//* End of file ------------------------------------------------------------- */

IIC.c

#include "stm32f10x.h"#include "MD_IIC.h"void IIC_GPIO_Configuration( GPIO_TypeDef * GPIOx_SDA , uint16_t SDA_Pin , GPIO_TypeDef * GPIOx_SCL , uint16_t SCL_Pin ){    GPIO_InitTypeDef GPIO_InitStructure;    uint32_t RCC_GPIOx_SDA = 0;    uint32_t RCC_GPIOx_SCL = 0;    //得到滤波后的引脚端口    RCC_GPIOx_SDA = GPIO_Filter( GPIOx_SDA );    RCC_GPIOx_SCL = GPIO_Filter( GPIOx_SCL );    //使能时钟    RCC_APB2PeriphClockCmd(RCC_GPIOx_SDA,ENABLE);    RCC_APB2PeriphClockCmd(RCC_GPIOx_SCL,ENABLE);    //配置引脚    GPIO_InitStructure.GPIO_Pin = SDA_Pin;    GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;    GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_OD;    GPIO_Init(GPIOx_SDA, &GPIO_InitStructure);    GPIO_InitStructure.GPIO_Pin = SCL_Pin;    GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz;    GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_OD;    GPIO_Init(GPIOx_SCL, &GPIO_InitStructure);    //初始化ICC的模式    SET_SDA;    SET_SCL;  }void IIC_Delay(void){    u32 i = 5;    while( i-- );}u8 IIC_Start(void){    SET_SDA;    IIC_DELAY;    SET_SCL;    IIC_DELAY;    if( IIC_SDA_STATE == RESET )    {        return IIC_BUS_BUSY;    }    RESET_SDA;    IIC_DELAY;    RESET_SCL;    IIC_DELAY;    if( IIC_SDA_STATE == SET )    {        return IIC_BUS_ERROR;    }    return IIC_BUS_READY;}void IIC_Stop(void){    RESET_SDA;    IIC_DELAY;    SET_SCL;    IIC_DELAY;    SET_SDA;    IIC_DELAY;}/* 收到数据,发送NACK - */void IIC_SendNACK(void){    RESET_SDA;    IIC_DELAY;    SET_SCL;    IIC_DELAY;    RESET_SCL;     IIC_DELAY; }/* 收到数据,发送ACK -- */void IIC_SendACK(void){    SET_SDA;    IIC_DELAY;    SET_SCL;    IIC_DELAY;    RESET_SCL;     IIC_DELAY;}/* 发送一个字节 ----------------------------------------------------------- */u8 IIC_SendByte(u8 Data){     u8 i;     RESET_SCL;     for(i=0;i<8;i++)     {          //数据建立        if(Data&0x80)        {            SET_SDA;        }        else        {            RESET_SDA;        }         Data<<=1;        IIC_DELAY;    //数据建立保持一定延时        SET_SCL;      //产生一个上升沿[正脉冲]         IIC_DELAY;        RESET_SCL;        IIC_DELAY;    //延时,防止SCL还没变成低时改变SDA,从而产生START/STOP信号      }     //接收从机的应答      SET_SDA;      IIC_DELAY;     SET_SCL;     IIC_DELAY;        if(IIC_SDA_STATE)     {        RESET_SCL;        return IIC_NACK;     }     else     {        RESET_SCL;        return IIC_ACK;       }    }/* 接收一个字节 ----------------------------------------- */u8 IIC_RecvByte(void){     u8 i,Dat = 0;     SET_SDA;     RESET_SCL;      Dat=0;     for(i=0;i<8;i++)     {        SET_SCL;           //产生时钟上升沿[正脉冲],让从机准备好数据         IIC_DELAY;         Dat<<=1;        if(IIC_SDA_STATE)  //读引脚状态        {            Dat|=0x01;         }           RESET_SCL;         //准备好再次接收数据          IIC_DELAY;         //等待数据准备好              }     return Dat;}/* 单字节写入 -------------------------------------------------------- */void Single_Write_IIC(u8 SlaveAddress,u8 REG_Address,u8 REG_data){    IIC_Start();                  //起始信号    IIC_SendByte(SlaveAddress);   //发送设备地址+写信号    IIC_SendByte(REG_Address);    //内部寄存器地址， //请参考中文pdf22页     IIC_SendByte(REG_data);       //内部寄存器数据， //请参考中文pdf22页     IIC_Stop();                   //发送停止信号}/* 单字节读取 --------------------------------------------------------- */u8 Single_Read_IIC(u8 SlaveAddress, u8 REG_Address){      u8 REG_data;    IIC_Start();                          //起始信号    IIC_SendByte(SlaveAddress);           //发送设备地址+写信号    IIC_SendByte(REG_Address);            //发送存储单元地址，//从0开始     IIC_Start();                          //起始信号    IIC_SendByte(SlaveAddress+1);         //发送设备地址+读信号    REG_data = IIC_RecvByte();            //读出寄存器数据    IIC_SendACK();       IIC_Stop();                           //停止信号    return REG_data; }//引脚端口过滤器 返回值为 引脚端口的时钟编号uint16_t GPIO_Filter( GPIO_TypeDef * GPIOx ){        uint32_t RCC_GPIOx = 0;     if( GPIOx == GPIOA )    {        RCC_GPIOx = RCC_APB2Periph_GPIOA;    }    else if( GPIOx == GPIOA )    {        RCC_GPIOx = RCC_APB2Periph_GPIOA;    }    else if( GPIOx == GPIOB )    {        RCC_GPIOx = RCC_APB2Periph_GPIOB;    }    else if( GPIOx == GPIOC )    {        RCC_GPIOx = RCC_APB2Periph_GPIOC;    }    else if( GPIOx == GPIOD )    {        RCC_GPIOx = RCC_APB2Periph_GPIOD;    }    else if( GPIOx == GPIOE )    {        RCC_GPIOx = RCC_APB2Periph_GPIOE;    }    else if( GPIOx == GPIOF )    {        RCC_GPIOx = RCC_APB2Periph_GPIOF;    }    else if( GPIOx == GPIOG )    {        RCC_GPIOx = RCC_APB2Periph_GPIOG;    }    return RCC_GPIOx;}

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