工程下载地址：http://blog.chinaunix.net/u3/106835/showart_2389150.html

#include "config.h" //相关头文件

 

#define C02MasterAddr 

0xa0//C02的器件地址

#define C02SlaveAddr  0   //读写数据的起始地址

#defineLED           (1 << 19)//LED IO口号

#defineLED2          (1 << 20)

 

#defineAA            (1 << 2)//I2CONSET的各位定义

#defineSI            (1 << 3)

#defineSTO           (1 << 4)

#defineSTA           (1 << 5)

#defineI2EN          (1 << 6)

#defineWRMode        0    //写模式

#defineRDMode        1    //读模式

#definelastbyte      1    //是否为最后一个字节

 

uint8 I2C_buf1 = 5;

uint8 I2C_buf2 = 0;

//延时函数

void Delay(uint32 dly)

{

    uint32i;

    

    for(; dly> 0; dly--)

    {

      for(i = 0; i < 50000; i++);

    }

}

//I2C初始化函数

void I2C_Init(uint32 Fi2c)

{

    if(Fi2c> 400000)

    {

      Fi2c =400000;

    }

    

    PINSEL0 =(PINSEL0 & (~0xf0)) |0x50;//这里是让P02,P03选第二功能，即I2C总线

    

    I2SCLH =(Fpclk/Fi2c + 1) / 2;//设置I2C速度为400K

    I2SCLL =(Fpclk/Fi2c) / 2;

    

    I2CONCLR =0x2c; //主发送模式对STA,AA,SI清零

    I2CONSET =0x40;//使用I2C总线

    

//    I2CONCLR =STA|AA|SI;

//    I2CONSET =I2EN;

    

}

//I2C bus start function

void I2C_Start(void)

{

    I2CONSET =STA;//set start condition

   do{}while(0x08 != I2STAT);//A start condition hasbeen transmitted

    I2CONCLR =STA;//clear start condition

}

//I2C bus stop function

void I2C_Stop(void)

{

    I2CONSET =STO; //set STO condition

    I2CONCLR =SI; //clear SI condition

}

//write byte function

void WriteByte(uint8 data)

{

    I2DAT =data;// data transmitted

    I2CONCLR =SI;//clear SI condition

}

//wirte I2C bus address mode is RDMode or WRMode

void WriteAddr(uint8 Mode)

{

   WriteByte(C02MasterAddr + Mode);//transmite theI2C address and R/W mode

    

   if(Mode)

    {

      do{}while(0x40 != I2STAT);//SLA+R has beentransmitted;ACK has been recevied

    }

    else

    {

      do{}while(0x18 != I2STAT);//SLA+W has beentransmitted;ACK has been received

    }

}

//write data to I2C

void WriteData(uint8 data)

{

   WriteByte(data);// data is will transmiteddata

   do{}while(0x28 != I2STAT);//Data byte in I2DAThas been transmitted;ACK has been received

}

//read i2c byte

uint8 ReadByte(uint8 last)

{

   if(last)

    {

      I2CONCLR = AA;

      I2CONCLR = SI;

      

      do{} while(0x58 != I2STAT);//data byte has beenreceived;NOT ACK has been returned

    }

    else

    {

      I2CONSET = AA;//transmited ACK

      I2CONCLR = SI;

      do{}while(0x50 != I2STAT);//data byte has beenreceived;ACK has been returned.

   }   

    

    returnI2DAT;//return read data

}

//write data into 24c02

void WriteC02(void)

{

//    uint8i;//define unsigned char i

   I2C_Start();

   WriteAddr(WRMode);

   WriteData(C02SlaveAddr);//the data storaddress

    

   WriteData(I2C_buf1);

   I2C_Stop();

}

//read I2C data

void ReadC02(void)

{

//    uint8i;

   I2C_Start();

   WriteAddr(WRMode);

   WriteData(C02SlaveAddr);

   I2C_Stop();

    

   I2C_Start();

   WriteAddr(RDMode);

    

    I2C_buf2 =ReadByte(lastbyte);

    

   I2C_Stop();

}

int main(void)

{

    

    PINSEL0 =0x00000000;

    PINSEL1 =0x00000000;

    

    IODIR =LED|LED2;

    IOSET =LED|LED2;

    

   I2C_Init(400000);

    

   WriteC02();

   Delay(1000);

   ReadC02();

    

    if(I2C_buf2== I2C_buf1)

    {

   while(1){

      IOCLR = LED;//correct LED1 light

      Delay(50);

      IOSET = LED;

      Delay(50);

      }

    }

    else

    {

      while(1)

      {

         IOCLR = LED2;//error LED2 light

         Delay(50);

         IOSET = LED2;

         Delay(50);

      }

    }

    

    

return 0;   

}