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sbit AD7799_CS=P1^4;
sbit AD7799_RDY=P1^6;

//SPCR    SPI控制寄存器

//SPSR    SPI狀態(tài)寄存器

//SPDAT    SPI數(shù)據(jù)寄存器
void SPI_init(void)
{
    SPCR=0x5e;//SPI控制寄存器，中斷禁止，SPI使能，高位在前，主機(jī)模式，時(shí)鐘空閑時(shí)為高，后沿觸發(fā)移位，時(shí)鐘分頻64
SPSR=0x00;//清中斷標(biāo)志位
}
/*--------------------------------------------
寫AD7799寄存器函數(shù)
WriteData：要寫的數(shù)據(jù)
----------------------------------------------*/
void WriteByteToAd7799(unsigned char WriteData)
{
    SPDAT= WriteData;
    while(~SPSR&0x80);        //等待數(shù)據(jù)發(fā)送完
    SPSR=0x00;                     //清中斷標(biāo)志位

}
/*--------------------------------------------
防止時(shí)序混亂，實(shí)現(xiàn)再同步
----------------------------------------------*/
void WaiteRDY(void)
{
    unsigned int count=0 ;
    while(AD7799_RDY)
    {    
        count++;
        if(count>20000)
        {
             //reset ad7799
            WriteByteToAd7799(0xff);

            WriteByteToAd7799(0xff);
                                      /*----------防止時(shí)序混亂，重新同步----------*/
            WriteByteToAd7799(0xff);

            WriteByteToAd7799(0xff);

            AD7799_init();
            break ;
        }
    }
}

/*--------------------------------------------
AD7799初始化函數(shù)
----------------------------------------------*/
void AD7799_init(void)
{
   AD7799_CS=0;
/*------------------------增益為128,通道0----------------------------------------*/
    WriteByteToAd7799(0x10); //寫通信寄存器設(shè)置下一個(gè)操作為寫配置寄存器

    WriteByteToAd7799(0x37); //增益為128

    WriteByteToAd7799(0x30); //通道0

/*------------------- 寫模式寄存器初始化零值校準(zhǔn)------------------------------------*/
    WriteByteToAd7799(0x08); //寫通信寄存器設(shè)置下一個(gè)操作為寫模式寄存器

    WriteByteToAd7799(0x80);

    WriteByteToAd7799(0x0A);

    WaiteRDY();              //Wait for RDY pin to go low to indicate end of calibration cycle*/
/*------------------寫模式寄存器初始化全值校準(zhǔn)-------------------------------------*/
    WriteByteToAd7799(0x08); //寫通信寄存器設(shè)置下一個(gè)操作為寫模式寄存器

    WriteByteToAd7799(0xA0);

    WriteByteToAd7799(0x0A);

    WaiteRDY();              // Wait for RDY pin to go low to indicate end of calibration cycle
/*------------------模式0,Continuous-Conversion Mode,Fadc=16.7HZ------------------*/
    WriteByteToAd7799(0x08);      //寫通信寄存器設(shè)置下一個(gè)操作為寫模式寄存器

    WriteByteToAd7799(0x00);

    WriteByteToAd7799(0x0A);

}
unsigned long ReadAd7799ConversionData(void)
{
    unsigned long ConverData;
    unsigned char ADSAT ;
    unsigned char ErrNUM=0;
    WaiteRDY();

    WriteByteToAd7799(0x40);     //寫通信寄存器設(shè)置下一個(gè)操作為讀狀態(tài)STATUS寄存器

    WriteByteToAd7799(0xff);     //偽寫通信寄存器，為讀狀態(tài)寄存器提供時(shí)鐘

    ADSAT=SPDAT;                 //讀取接收到的數(shù)據(jù)
    while((ADSAT&0x40)||(!(ADSAT&0x08)))      //出錯(cuò)或者讀寫異常
    {
         //reset ad7799
         WriteByteToAd7799(0xff);

         WriteByteToAd7799(0xff);
                                      /*----------防止時(shí)序混亂，重新同步----------*/
         WriteByteToAd7799(0xff);

         WriteByteToAd7799(0xff);

//-------------------------------------------------------------------------------------     
        AD7799_init();
       
        WaiteRDY();
        WriteByteToAd7799(0x40);     //寫通信寄存器設(shè)置下一個(gè)操作為讀狀態(tài)STATUS寄存器

        WriteByteToAd7799(0xff);     //偽寫通信寄存器，為讀狀態(tài)寄存器提供時(shí)鐘

        ADSAT=SPDAT;                 //讀取接收到的數(shù)據(jù)
       
        ErrNUM++;
        if(ErrNUM>5)break;
    }

    WriteByteToAd7799(0x58);        //寫通信寄存器設(shè)置下一個(gè)操作為連續(xù)讀數(shù)據(jù)寄存器

    WaiteRDY();
    /* Wait for RDY pin to go low to indicate end of calibration cycle*/
    if(!AD7799_RDY)
    {
        ConverData=0 ;
/*-----------------Read Conversion Result from AD7799's Data Register----------------*/

        WriteByteToAd7799(0xff);             //偽寫通信寄存器，為讀數(shù)據(jù)寄存器寄存器提供時(shí)鐘
        ConverData=SPDAT;
        ConverData=ConverData<<8 ;

        WriteByteToAd7799(0xff);             //偽寫通信寄存器，為讀數(shù)據(jù)寄存器寄存器提供時(shí)鐘
        ConverData=ConverData+SPDAT;
        ConverData=ConverData<<8 ;

        WriteByteToAd7799(0xff);             //偽寫通信寄存器，為讀數(shù)據(jù)寄存器寄存器提供時(shí)鐘
        ConverData=ConverData+SPDAT;
       
    }
    if(ErrNUM>5)return(0);
    else return(ConverData);
}