老师的IIC 程序 拿来看看

#include <string.h>

#include "..\inc\44b.h"

#include "..\inc\44blib.h"

#include "..\inc\iic.h"

volatile int f_nGetACK;//获取中断响应标志

//初始化IIC接口

void Iic_init(void)

{

rIICCON=(1<<7)|(1<<6)|(1<<5)|(0x0A);// Enable ACK, interrupt, IICCLK=MCLK/512, Enable ACK//64Mhz/512/(15+1) = 8Khz

rIICADD=0x10;   // S3C44B0X slave address

    rIICSTAT=0x10;

}

/**************************************************************************

功能:IIC总线写函数

参数: unSlaveAddr-IIC设备地址

SubAddr-IIC设备子地址(0,8或16位)

SubMod-IIC设备子地址模式(0-无,1-8位,2-16位)

dat-待发送数据

Size-待发送数据字节个数

作者:王剑平(2008-5-23)

**************************************************************************/

void IIC_Write(unsigned char ucSlaveAddr,unsigned int SubAddr, 

  unsigned char SubMod, char *dat,unsigned int Size)

{

U8 address[2];

U32 ucCur;

f_nGetACK = 0;

    

    // Send SlaveAddr byte

    rIICDS = ucSlaveAddr; //Slave Address

    rIICSTAT = 0xf0; // Master Tx,Start

    while(f_nGetACK == 0); // Wait ACK

    f_nGetACK = 0;

    

    // Send address

switch ( SubMod )//计算子地址 

  { 

  case 0://无子地址 

    break; 

  case 1://1位子地址 

  address[0] = (U8)(SubAddr); 

    break; 

  case 2://2位子地址 

  address[0] = (U8)(SubAddr >> 8); 

  address[1] = (U8)(SubAddr); 

    break; 

  default: 

    break; 

  } 

for(ucCur=0;ucCur<SubMod;ucCur++)

{

rIICDS = address[ucCur];

rIICCON = 0xe5;   // Resumes IIC operation.

while(f_nGetACK == 0); // Wait ACK

f_nGetACK = 0;

}

    

    // Send data

for(ucCur=0;ucCur<Size;ucCur++)

{

rIICDS = dat[ucCur];

rIICCON = 0xe5;   // Resumes IIC operation.

while(f_nGetACK == 0); // Wait ACK

f_nGetACK = 0;

}

    

    // End send

    rIICSTAT = 0xd0; // Stop Master Tx condition

    rIICCON = 0xe5; // Resumes IIC operation.

while(rIICSTAT & 0x20 == 1); // Wait until stop condtion is in effect.

Delay(20); 

}

/**************************************************************************

功能:IIC总线读函数

参数: unSlaveAddr-IIC设备地址

SubAddr-IIC设备子地址(0,8或16位)

SubMod-IIC设备子地址模式(0-无,1-8位,2-16位)

dat-读回数据指针

Size-待读数据字节个数

作者:王剑平(2008-5-23)

**************************************************************************/

void IIC_Read(unsigned char ucSlaveAddr,unsigned int SubAddr, 

  unsigned char SubMod,char *pData,unsigned int Size)

{

U8 address[2];

U32 ucCur;

f_nGetACK = 0;

// Send SlaveAddr byte 设备地址

    rIICDS = ucSlaveAddr; //Slave Address

    rIICSTAT = 0xf0; // Master Tx,Start

    while(f_nGetACK == 0); // Wait ACK

    f_nGetACK = 0;

// Send address

switch ( SubMod )//计算子地址 

  { 

  case 0://无子地址 

    break; 

  case 1://1位子地址 

  address[0] = (U8)(SubAddr); 

    break; 

  case 2://2位子地址 

  address[0] = (U8)(SubAddr >> 8); 

  address[1] = (U8)(SubAddr); 

    break; 

  default: 

    break; 

  } 

for(ucCur=0;ucCur<SubMod;ucCur++)

{

rIICDS = address[ucCur];

rIICCON = 0xe5;   // Resumes IIC operation.

while(f_nGetACK == 0); // Wait ACK

f_nGetACK = 0;

}

// Send SlaveAddr byte 设备地址

    rIICDS = ucSlaveAddr; // 设备地址

    rIICSTAT = 0xb0; // Master Rx,Start

rIICCON = 0xe5;   // Resumes IIC operation.   

    while(f_nGetACK == 0); // Wait ACK

    f_nGetACK = 0;

    

    // Get data 数据

for(ucCur=0;ucCur<Size;ucCur++)

{

rIICCON = 0xe5; //zlb change

if(ucCur == Size-1) //zlb change

rIICCON = 0x65;//在这里为什么是6不是e?zlg change

while(f_nGetACK == 0); // Wait ACK but no ack just wait intrupt

f_nGetACK = 0;

pData[ucCur] = rIICDS;

}

    

    /* End receive */

    rIICSTAT = 0x90;   // Stop Master Rx condition 

rIICCON = 0xe5;   // Resumes IIC operation.

while(rIICSTAT & 0x20 == 1); // Wait until stop condtion is in effect.

Delay(20); 

}

/**************************************************************************

功能:IIC总线中断响应函数

参数: 无

作者:王剑平(2008-5-23)

**************************************************************************/

void __irq IicInt(void)

{

rI_ISPC=BIT_IIC;

f_nGetACK = 1;

return;

}