实现存储器EEPROM AT24C02的数据读写操作 采用IIC总线读写 C程序

1、/* 功能:11:32 2008-6-27作者:SG时间:2004-03-15*/#include "INTRINS.H"#include "reg52.h"#define WriteDeviceAddress 0xa0 /写驱动地址指令#define ReadDeviceAddress 0xa1 /读驱动地址指令sbit AT24C02_SCL = 0xa4;sbit AT24C02_SDA = 0xa5;/*-功能：发起始信号-*/void Start_Cond()AT24C02_SCL = 0;_nop_();AT24C02_SDA = 1;_no

2、p_();AT24C02_SCL = 1;_nop_();AT24C02_SDA = 0;_nop_();/*-功能：发停止信号-*/void Stop_Cond()AT24C02_SCL = 0;_nop_();AT24C02_SDA = 0;_nop_();AT24C02_SCL = 1;_nop_();AT24C02_SDA = 1;_nop_();/*- 功能：发确认信号-*/ void Ack()AT24C02_SCL = 0;_nop_();AT24C02_SDA = 0;AT24C02_SCL = 1;_nop_();AT24C02_SCL = 0;_nop_();AT24C02

3、_SDA = 1;/*- 功能：发无确认信号-*/ void NoAck()AT24C02_SCL = 0;_nop_();AT24C02_SDA = 1;_nop_();AT24C02_SCL = 1;_nop_();AT24C02_SCL = 0;_nop_();/*- 功能：写一个字节数据-*/ bit Write8Bit(unsigned char input)unsigned char i;for (i=0;i<8;i+)AT24C02_SCL = 0;input <<= 1;AT24C02_SDA = CY;AT24C02_SCL = 1;AT24C02_SCL

4、= 0;_nop_();AT24C02_SDA = 1;AT24C02_SCL = 1;_nop_();CY = AT24C02_SDA;return(CY) ;/*-功能：读一个字节数据-*/unsigned char Read8Bit()unsigned char temp,rbyte=0;for (temp = 8;temp != 0;temp-)AT24C02_SCL = 0;_nop_();rbyte = (rbyte << 1) | AT24C02_SDA;AT24C02_SCL = 1;_nop_();return rbyte;/*-功能：从EEPROM中给定一个地址

5、连续读NLEN个字节数据存放在以指针 nContent开头的往下内容。-*/bit Read_Flash ( unsigned char *nContent, unsigned char nAddr, unsigned char nLen ) unsigned char Addr;Addr = nAddr;Start_Cond(); /写开始信号Write8Bit(WriteDeviceAddress); /写驱动地址Write8Bit(Addr); /写从EEPROM中读的开始地址Start_Cond(); /写开始信号Write8Bit(ReadDeviceAddress); /写读数据指

6、令while(-nLen)*nContent=Read8Bit(); /读出内容nContent+; /指针加1Ack(); /发确认信号*nContent=Read8Bit(); /读一字节NoAck(); /没有确认信号Stop_Cond(); /发停止信号return(0); /返回/*-功能：初始化EEPROM子程序内容为FF-*/bit Init_Flash ( unsigned int nPage ) / 8 Byte/1Page init 0xFFunsigned char nLen;unsigned char Addr;nLen=8;Addr=8 *nPage;Start_Co

7、nd();Write8Bit(WriteDeviceAddress);Write8Bit(Addr);for(;nLen!=0;nLen-)if(Write8Bit(0xff) break; /if Write8Bit() Return 1 Write Flase Stop_Cond();return(CY);/*-功能：从EEPROM中给定一个地址连续写NLEN个字节数据存放在以指针 nContent开头的往下内容。-*/bit Write_Flash ( unsigned char *nContent, unsigned char nAddr,unsigned char nLen) uns

8、igned char i,temp;unsigned char Addr;Addr = nAddr;Start_Cond(); /写开始信号Write8Bit(WriteDeviceAddress); /写驱动地址Write8Bit(Addr); /写从EEPROM中写的开始地址for(i = 0;i < nLen;i+)if(Addr%8=0) /每页8字节 /换页Stop_Cond();_nop_();Start_Cond();Write8Bit(WriteDeviceAddress);Write8Bit(Addr);temp = *nContent;if(Write8Bit(tem

9、p) break; /CYnContent+;Addr+;Stop_Cond(); /发停止信号return(CY);/*-主程序功能：实现存储器EEPROM AT24C02的数据读写操作-*/void main()unsigned char dat16,i;Read_Flash(dat,0,16); /读出AT24C02中从地址0开始依次往后16个字节放入dat数组中Init_Flash(0); /将AT24C02的第0页初始化为FFRead_Flash(dat,0,16); /读出AT24C02中从地址0开始依次往后16个字节放入dat数组中for(i = 0;i < 16;i+ )da