atmel7s256 的IIC程序
/********************************Copyright (c)**********************************
**文件名 iic.C
**创建: Sha zq
**E-mail：[email protected]
**日期: 2008-01-24
**描述: ZLG7290库函数程序，IIC程序接口
** 修改人:
** 版本:
** 日期:
** 描述:
*******************************************************************************/
#include "board.h"
#define AT91C_TWI_CLOCK 8000
#define zlg7290 (0x38<<16) //ZLG7290的IIC地址
#define zlg7291 (0x38<<16) //ZLG7290的IIC地址
/*============================================================
* 函 数 名: AT91F_SetTwiClock
* 参 数：Null
* 功能描述:
* 设置IIC的时钟
* 返 回 值：Null
* 作 者：Sha zq 日期：2008-01-24
============================================================*/
void AT91F_SetTwiClock(void)
{
int sclock;
/* Here, CKDIV = 1 and CHDIV=CLDIV ==> CLDIV = CHDIV = 1/4*((Fmclk/FTWI) -6)*/
sclock = (10*MCK /AT91C_TWI_CLOCK);
if (sclock % 10 >= 5)
sclock = (sclock /10) - 5;
else
sclock = (sclock /10)- 6;
sclock = (sclock + (4 - sclock %4)) >> 2; // div 4
AT91C_BASE_TWI->TWI_CWGR = ( 1<<16 ) | (sclock << 8) | sclock ;
}
/*===========================================================
* 函 数 名: AT91F_TWI_WriteByte
* 参 数：pTwi，int_address，*data2send，size
* 功能描述:
* 通过硬件IIC接口，向IIC接口的器件写数据
* 返 回 值：Null
* 作 者：Sha zq 日期：2008-01-24
============================================================*/
int AT91F_TWI_WriteByte(const AT91PS_TWI pTwi , int int_address, char *data2send, int size)
{
unsigned int status,sta,rece;
// Set the TWI Master Mode Register
pTwi->TWI_MMR = (zlg7290|AT91C_TWI_IADRSZ_1_BYTE) & ~AT91C_TWI_MREAD;
// Set TWI Internal Address Register
pTwi->TWI_IADR = int_address;
status = pTwi->TWI_SR;
pTwi->TWI_THR = *(data2send++);
pTwi->TWI_CR = AT91C_TWI_START;
while(size-->1)
{
while (!(pTwi->TWI_SR & AT91C_TWI_TXRDY));
pTwi->TWI_THR = *(data2send++);
}
pTwi->TWI_CR = AT91C_TWI_STOP;
status = pTwi->TWI_SR;
while (!(pTwi->TWI_SR & AT91C_TWI_TXCOMP));
return 1;
}
/*===========================================================
* 函 数 名: AT91F_TWI_ReadByte
* 参 数：pTwi，int_address，*data2send，size
* 功能描述:
* 通过硬件IIC接口，向IIC接口的器件读数据
* 返 回 值：Null
* 作 者：Sha zq 日期：2008-01-25
============================================================*/
int AT91F_TWI_ReadByte(const AT91PS_TWI pTwi , int int_address, char *data, int size)
{
unsigned int status;
// Set the TWI Master Mode Register
pTwi->TWI_MMR = (zlg7291|AT91C_TWI_IADRSZ_1_BYTE) |AT91C_TWI_MREAD;
// Set TWI Internal Address Register
pTwi->TWI_IADR = int_address;
pTwi->TWI_CR = AT91C_TWI_START;
status = pTwi->TWI_SR;
while(size-->1)
{
while (!(pTwi->TWI_SR & AT91C_TWI_RXRDY));
*(data++)=pTwi->TWI_RHR ;
}
pTwi->TWI_CR = AT91C_TWI_STOP;
status = pTwi->TWI_SR;
while (!(pTwi->TWI_SR & AT91C_TWI_TXCOMP));
*data=pTwi->TWI_RHR ;
return 1;
}
/*============================================================
* 函 数 名: AT91F_TWI_Open
* 参 数：null
* 功能描述:
* 初始化IIC
* 返 回 值：Null
* 作 者：Sha zq 日期：2008-01-24
============================================================*/
void AT91F_TWI_Open(void)
{
// Configure TWI PIOs
AT91F_TWI_CfgPIO ();
AT91F_PIO_CfgOpendrain(AT91C_BASE_PIOA,(unsigned int) AT91C_PA3_TWD);
// Configure PMC by enabling TWI clock
AT91F_TWI_CfgPMC ();
// Configure TWI in master mode
AT91F_TWI_Configure (AT91C_BASE_TWI);
// Set TWI Clock Waveform Generator Register
AT91F_SetTwiClock();
}
此程序，主要为ZLG7290。ZLG7290部分的代码，可以参考前面的文章呵呵
有问题欢迎交流，大家好才是真的好 嘿嘿