i2c c语言汇编代码

#include     

    #include     

    #include     

    #include     

   

    #define DELAY_TIME 10    

    #define FALSE 0    

    #define TRUE 1    

    const unsigned char SCL_PIN=0x01;    

    const unsigned char SDA_OIN=0x02;    

   

    static void SET_SCL(void)    

    {    

        asm{    

            mov dx,0x378    

            in  ax,dx    

            or  ax,SCL_PIN            //将SCL置1    

            out dx,ax    

        }    

    }    

   

    static void CLR_SCL(void)    

    {    

        asm{    

            mov dx,0x378    

            in  ax,dx    

            or  ax,0xff-SCL_PIN       //将SCL置0    

            out dx,ax    

        }    

    }    

   

    static void SET_SDA(void)    

    {    

        asm{    

            mov dx,0x378    

            in  ax,dx    

            or  ax,SDA_PIN            //将SDA置1    

            out dx,ax    

        }    

    }    

   

    static void CLR_SDA(void)    

    {    

        asm{    

            mov dx,0x378    

            in  ax,dx    

            or  ax,0xff-SDA_PIN        //将SDA置0    

            out dx,ax    

        }    

    }    

   

    void DELAY(int t=DELAY_TIME)      //延时子程序    

    {    

        for(int i=0;i

    }    

   

    void IIC_Start(void)                   //启动I2C总线    

    {    

                                       //在SCL为高电平时，使SDA出现一个负跳变    

        SET_SDA();    

        SET_SCL();    

        DELAY();    

        CLR_SDA();    

        DELAY();    

        CLR_SCL();    

        DELAY();    

    }    

   

    void IIC_Stop(void)                  //终止I2C总线    

    {    

                                      //在SCL为高电平时，使SDA出现一个正跳变    

        CLR_SDA();    

        SET_SCL();    

        DELAY();    

        SET_SDA();    

        DELAY();    

        CLR_SCL();    

        DELAY();    

    }    

   

    void SEND_0(void)                  //发送BIT0    

    {    

                                      //在SCL为高电平时，使SDA保持低电平    

        CLR_SDA();    

        SET_SCL();    

        DELAY();    

        CLR_SCL();    

        DELAY();    

    }    

   

    void SEND_1(void)                 //发送BIT1    

    {    

                                     //在SCL为高电平时，使SDA保持高电平    

        SET_SDA();    

        SET_SCL();    

        DELAY();    

        CLR_SCL();    

        DELAY();    

    }    

   

    int Check_Acknowledge(void)    

    {    

                                     //发送完每个字节检查SLAVE的应答信号    

        SET_SDA();                   //主器件释放SDA线    

        SET_SCL();    

        DELAY(DELAY_TIME/2);    

        unsigned char b=inportb(0x378);    //采样信号线    

        DELAY(DELAY_TIME/2);    

        CLR_SCL();    

        DELAY();    

        if(b&0xSDA_PIN)               //SALVE返回1    

            return FLASE;    

        return TRUE;    

    }