51单片机I2C总线 EEPROM的程序问题

//AT24C系列读写程序

//本程序调试通过

#include "csh.h"

#include<reg51.h>

#include <intrins.h>

sbit SDA=P3^3//AT24C02数据线

sbit SCL=P3^2//AT24C02时钟线

//sbit SDA=P3^4//AT24C02数据线

//sbit SCL=P3^3//AT24C02时钟线

void start()

// 开始位

{

SDA = 1

SCL = 1

_nop_()

_nop_()

SDA = 0

_nop_()

_nop_()

_nop_()

_nop_()

SCL = 0

}

void stop()

// 停止位

{

SDA = 0

_nop_()

_nop_()

SCL = 1

_nop_()

_nop_()

_nop_()

_nop_()

SDA = 1

}

unsigned char shin()

// 从AT24Cxx移入数据到MCU

{

unsigned char i,read_data

for(i = 0i <8i++)

{

SCL = 1

read_data <<= 1

read_data |= (unsigned char)SDA

SCL = 0

}

return(read_data)

}

bit shout(unsigned char write_data)

// 从MCU移出数据到AT24Cxx

{

unsigned char i

bit ack_bit

for(i = 0i <8i++) // 循环移入8个位

{

SDA = (bit)(write_data &0x80)

_nop_()

SCL = 1

_nop_()

_nop_()

SCL = 0

write_data <<= 1

}

SDA = 1 // 读取应答

_nop_()

_nop_()

SCL = 1

_nop_()

_nop_()

_nop_()

_nop_()

ack_bit = SDA

SCL = 0

return ack_bit // 返回AT24Cxx应答位

}

void write_byte(unsigned char addr, unsigned char write_data)

// 在指定地址addr处写入数据write_data

{

start()

shout(OP_WRITE)

shout(addr)

shout(write_data)

stop()

delay(10) // 写入周期

}

unsigned char read_current()

// 在当前地址读取

{

unsigned char read_data

start()

shout(OP_READ)

read_data = shin()

stop()

return read_data

}

unsigned char read_random(unsigned char random_addr)

// 在指定地址读取

{

start()

shout(OP_WRITE)

shout(random_addr)

return(read_current())

}

STM32F10x_模拟I2C读写EEPROM：

http://blog.csdn.net/ybhuangfugui/article/details/52151835

STM32F10x_硬件I2C读写EEPROM(标准外设库版本)：

http://blog.csdn.net/ybhuangfugui/article/details/52175621

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