单片机开发 | STM32实现AT24CXX应用（代码类）

博主github：https://github.com/MichaelBeechan
博主CSDN：https://blog.csdn.net/u011344545

/***************
 Time:2017.1.4
 Name:MichaelBeechan
 Dress:Chongqing university of science and technology
****************/

#ifndef _AT24cxx_H
#define _AT24cxx_
#include "stm32f10x.h"
//#include "Systick.h"
#include "IIC.h"


#define AT24C01 127
#define AT24C02 255
#define AT24C04 511
#define AT24C08 1023
#define AT24C16 2047
#define AT24C32 4095
#define AT24C64 8191
#define AT24C128 16383
#define AT24C256 32767


#define EE_TYPE AT24C02
u8 AT24Cxx_ReadOneByte(u8 addr); //read one byte
void AT24Cxx_WriteOneByte(u8 addr,u8 dat);  //write one byte
u16 AT24Cxx_ReadTwoByte(u16 addr); //read two byte
void AT24Cxx_WriteTwoByte(u16 addr,u16 dat);  //write two byte

#endif



#include "AT24cxx.h"


u8 AT24Cxx_ReadOneByte(u8 addr) //read one byte
{
    u8 temp;
    I2C_Start(); //Start signal
    if(EE_TYPE > AT24C16)
    {
        I2C_Send_Byte(0xa0); //A0,A1,A2 = 0;
        I2C_Wait_Ack();
        I2C_Send_Byte(addr >> 8); //I2C_Send_Byte(addr/256); send high byte
    }
    else 
    {
        I2C_Send_Byte(0xa0+(addr/256) << 1); //send device addr and data addr
    }
    I2C_Wait_Ack();
    I2C_Send_Byte(addr%256); //low byte
    I2C_Wait_Ack();

    I2C_Start(); //Start signal
    I2C_Send_Byte(0xa1);
    I2C_Wait_Ack();
    temp = I2C_Read_Byte(0);  //No ack
    I2C_Stop();
    return temp;
}


void AT24Cxx_WriteOneByte(u8 addr,u8 dat)  //write one byte
{
    I2C_Start(); //Start signal
    if(EE_TYPE > AT24C16)
    {
        I2C_Send_Byte(0xa0); //A0,A1,A2 = 0;
        I2C_Wait_Ack();
        I2C_Send_Byte(addr >> 8); //I2C_Send_Byte(addr/256); send high byte
    }
    else 
    {
        I2C_Send_Byte(0xa0+(addr/256) << 1); //send device addr and data addr
    }
    I2C_Wait_Ack();
    I2C_Send_Byte(addr%256); //low byte
    I2C_Wait_Ack();

    I2C_Send_Byte(dat); 
    I2C_Wait_Ack();
    I2C_Stop();

    delay_ms(10);
}


u16 AT24Cxx_ReadTwoByte(u16 addr) //read two byte
{
    u16 temp;
    I2C_Start(); //Start signal
    if(EE_TYPE > AT24C16)
    {
        I2C_Send_Byte(0xa0); //A0,A1,A2 = 0;
        I2C_Wait_Ack();
        I2C_Send_Byte(addr >> 8); //I2C_Send_Byte(addr/256); send high byte
    }
    else 
    {
        I2C_Send_Byte(0xa0+(addr/256) << 1); //send device addr and data addr
    }
    I2C_Wait_Ack();
    I2C_Send_Byte(addr%256); //low byte
    I2C_Wait_Ack();

    I2C_Start(); //Start signal
    I2C_Send_Byte(0xa1);
    I2C_Wait_Ack();
    temp = I2C_Read_Byte(1);  //ack
    temp <<= 8;
    temp |= I2C_Read_Byte(0);  //No ack
    I2C_Stop();
    return temp;
}


void AT24Cxx_WriteTwoByte(u16 addr,u16 dat)  //write two byte
{
    I2C_Start(); //Start signal
    if(EE_TYPE > AT24C16)
    {
        I2C_Send_Byte(0xa0); //A0,A1,A2 = 0;
        I2C_Wait_Ack();
        I2C_Send_Byte(addr >> 8); //I2C_Send_Byte(addr/256); send high byte
    }
    else 
    {
        I2C_Send_Byte(0xa0+(addr/256) << 1); //send device addr and data addr
    }
    I2C_Wait_Ack();
    I2C_Send_Byte(addr%256); //low byte
    I2C_Wait_Ack();

    I2C_Send_Byte(dat >> 8); 
    I2C_Wait_Ack();
    I2C_Send_Byte(dat & 0xff); 
    I2C_Wait_Ack();
    I2C_Stop();

    delay_ms(10);
}