关于TLC2543的时序问题!急盼讨论

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Tomzong|

楼主 | 2008-10-6 13:25 | 只看该作者回帖奖励

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tlc2543, 时序, IO, pi, se

本人写了一个关于12位A/D转换芯片,TLC2543与ARM7芯片的接口程序,写入芯片的子函数已经调试通过,还有读取的函数一时无法调试完成,还望高手指点!谢谢!
void SPI_Write(unsigned char _data){
    uint8 i;

    IO0SET =IO0PIN|SPI_CS;
    DelayNS(2);
    IO0CLR=IO0PIN|SPI_CS;

    for (i=0;i<=7;i++){
        if(_data&0x80){
            IO0CLR=IO0PIN|SCK;

            IO0SET=IO0PIN|SDO;
            DelayNS(2);
            IO0SET=IO0PIN|SCK;
               DelayNS(2);
        }
        else{

            IO0CLR=IO0PIN|SCK;

            IO0CLR=IO0PIN|SDO;
            DelayNS(2);
            IO0SET=IO0PIN|SCK;
            DelayNS(2);
        }
        _data<<=1;

    }
    IO0SET=IO0PIN|SPI_CS;
}

uint8 SPI_Read(void){
    uint8 uwd_voltage = 0;
    uint8 i;

    IO0SET =IO0PIN|SPI_CS;
    DelayNS(1);
    IO0CLR=IO0PIN|SPI_CS;
         DelayNS(1);

    for (i=0;i<=7;i++){

        IO0SET=IO0PIN|SCK;
        DelayNS(1);

        if (IO0PIN&SDI){
            uwd_voltage|=0x80;
            //uwd_voltage &=0x80;
         }
        else{
            uwd_voltage>>=1;
         }
        IO0CLR=IO0PIN|SCK;
        DelayNS(1);
    }

    IO0SET=IO0PIN|SPI_CS;
    DelayNS(2);

    return     uwd_voltage;
}

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