TEA5767的C51控制程序

//发送无应答信号
void iic_noack(device)
{
    sda(device,1);
    scl(device,1);
    scl(device,0);
}

//检测应答信号
bit iic_testack(device)
{
    bit errorbit;      //真确应答,返回0
    sda(device,1);
    iic_delay(iic_delay_time);
    scl(device,1);
    iic_delay(iic_delay_time);
    errorbit=sdasense(device);
    scl(device,0);
    iic_delay(iic_delay_time);
    return(errorbit);
}

//发送一个字节
void iic_write8bit(device,unsigned char input)
{
    unsigned char temp;
    for(temp=0;temp<8;temp++)
    {
        if((input<<temp)&0x80)
            sda(device,1);
        else
            sda(device,0);
        scl(device,1);

        iic_delay(iic_delay_time);
        scl(device,0);
    }
}

//读一个字节
unsigned char iic_read8bit(device)
{
    unsigned char temp,rbyte=0;
    for(temp=0;temp<8;temp++)
    {
        scl(device,1);
        iic_delay(iic_delay_time);
        if(sdasense(device))
            rbyte=(rbyte<<1)+1;
        else
            rbyte=rbyte<<1;
        scl(device,0);
    }
    return(rbyte);
}