i2c.c

单片机c语言程序设计100例--基于PIC+PROTEUS

//-----------------------------------------------------------------
// I2C驱动程序
//-----------------------------------------------------------------
#include "I2C.h"
//子器件地址定义
#define DEV_SUB_ADDR 0xA0
bit ack = 0;
//I2C通用操作宏定义
//注意:本例PIC16LF1937中SSPSATA第2位定义为R_nW,而在PIC16F877A中定义为RW
#define Idle()         {while ((SSPCON2 & 0x1F)|(R_nW));}
#define Wait()         {while (SSPIF == 0);SSPIF = 0;}
#define Start()        {Idle(); SSPIF = 0;  SEN = 1; Wait();}
#define Stop()         {Idle(); SSPIF = 0;  PEN = 1; Wait();}
#define RepStart()     {Idle(); SSPIF = 0;  RSEN = 1;Wait();}
#define WriteByte(x)   {Idle(); SSPBUF = x; Wait(); ack = !ACKSTAT; }
#define EnableRecv()   {Idle(); RCEN = 1;   while (SSPIF == 0);}
#define AckI2C()       {ACKDT = 0;ACKEN = 1;Wait();}
#define NoAckI2C()     {ACKDT = 1;ACKEN = 1;Wait();}
//-----------------------------------------------------------------
// I2C初始化
//-----------------------------------------------------------------
void I2C_Init()
{


}
      
//-----------------------------------------------------------------
// 向IIC-AT24C04指定地址写入一字节
//-----------------------------------------------------------------
INT8U I2C_Write(INT16U addr,INT8U dat) 
{


}
    
//-----------------------------------------------------------------
// 从IIC-AT24C04指定地址读取一字节
//-----------------------------------------------------------------
INT8U I2C_Read(INT16U addr)
{


}