24C64 E2ROM的读写C程序

#include

#define uchar unsigned char
#define uint unsigned int
#define ulong unsigned long

sbit WDOG=P3^4;        //看门狗
sbit I2C_SCK=P1^5;     //24cxx的时钟线
sbit I2C_SDA=P1^6;     //24CXX的数据线

bit   I2C_Start(void);
void  I2C_Stop(void);
void  I2C_Ack(void);
void  I2C_Nack(void);
bit   I2C_Send_Byte( uchar);
uchar I2C_Receive_Byte(void);
void  AT24C64_R(void *mcu_address,uint AT24C64_address,uint count);
void  AT24C64_W(void *mcu_address,uint AT24C64_address,uint count);

void FeedDog(void)
{
     WDOG=!WDOG;
}
void  Delay_10_uS(void)
{
        char i=10;
        while(i--);
}
void Delay_N_mS( uint n_milisecond)  /* n mS delay */
{
        uchar i;
        while(n_milisecond--)
        {
                i=37;
                while(i--);
        }
}
void I2C_Init(void)
{
        I2C_SCK=0;
        I2C_SDA=0;
}
bit I2C_Start(void)
{
        Delay_10_uS();
        I2C_SDA =1;
        Delay_10_uS();
        I2C_SCK =1;
        Delay_10_uS();
        if ( I2C_SDA == 0) return 0;
        if ( I2C_SCK == 0) return 0;
        I2C_SDA = 0;
        Delay_10_uS();
        I2C_SCK = 0;
        Delay_10_uS();
        return 1;
}
void  I2C_Stop(void)
{
        Delay_10_uS();
        I2C_SDA = 0;
        Delay_10_uS();
        I2C_SCK = 1;
        Delay_10_uS();
        I2C_SDA = 1;
        Delay_10_uS();
}
void I2C_Ack(void)
{
        Delay_10_uS();
        I2C_SDA=0;
        Delay_10_uS();
        I2C_SCK=1;
        Delay_10_uS();
        I2C_SCK=0;
        Delay_10_uS();
}
void I2C_Nack(void)
{
        Delay_10_uS();
        I2C_SDA=1;
        Delay_10_uS();
        I2C_SCK=1;
        Delay_10_uS();
        I2C_SCK=0;
        Delay_10_uS();
}
bit I2C_Send_Byte( uchar d)
{
        uchar i = 8;
        bit bit_ack;
        while( i-- )
        {
                Delay_10_uS();
                if ( d &0x80 )   I2C_SDA =1;
                else             I2C_SDA =0;
                Delay_10_uS();
                I2C_SCK = 1;
                Delay_10_uS();
                I2C_SCK = 0;
                d = d << 1;
        }
        Delay_10_uS();
        I2C_SDA = 1;
        Delay_10_uS();
        I2C_SCK = 1;
        Delay_10_uS();
        bit_ack = I2C_SDA;
        I2C_SCK =0;
        Delay_10_uS();
        return bit_ack;
}
uchar I2C_Receive_Byte(void)
{
        uchar i = 8, d;
        Delay_10_uS();
        I2C_SDA = 1;
        while ( i--)
        {
                d = d << 1;
                Delay_10_uS();
                I2C_SCK =1;
                if ( I2C_SDA ) d++;
                Delay_10_uS();
                I2C_SCK =0;
        }
        return d;
}
void AT24C64_W(void *mcu_address,uint AT24C64_address,uint count)
{
        FeedDog();
        while(count--)
        {
                I2C_Start();
                /*I2C_Send_Byte( 0xa0 + AT24C64_address /256 *2);*/  /* 24C16  USE */
                I2C_Send_Byte( 0xa0 );
                I2C_Send_Byte(  AT24C64_address/256 );
                I2C_Send_Byte( AT24C64_address %256 );
                I2C_Send_Byte( *(uchar*)mcu_address );
                I2C_Stop();
                Delay_N_mS(10);       /* waiting for write cycle to be completed */
                ((uchar*)mcu_address)++;
                AT24C64_address++;
        }
}
void AT24C64_R(void *mcu_address,uint AT24C64_address,uint count)
{
       FeedDog();
       while(count--)
       {
                I2C_Start();
                /*I2C_Send_Byte( 0xa0 + AT24C64_address / 256 *2 );*/   /* 24C16 USE */
                I2C_Send_Byte( 0xa0 );
                I2C_Send_Byte( AT24C64_address/256 );
                I2C_Send_Byte( AT24C64_address % 256 );
                I2C_Start();
                /*I2C_Send_Byte( 0xa1 + AT24C64_address /256 *2 );*/
                I2C_Send_Byte( 0xa1 );
                *(uchar*)mcu_address = I2C_Receive_Byte();
                I2C_Nack();
                I2C_Stop();
                ((uchar*)mcu_address)++;
                AT24C64_address++;
       }
}