c8051spi.c

关于新华龙C8051f020的spi和ad5620的驱动

void AD_READ(void)                  //读AD数据 
{    unsigned char temp,clear;  
     unsigned int i,ad1,ad2,ad0; 
            SELECT_AD;     //选通AD芯片 
            SPDR  = 0x00;  //指令通道0 
            while (!(SPSR&(1<<SPIF))); 
            clear = SPSR; 
            clear = SPDR; 
            SPDR  = 0x00; 
            while (!(SPSR&(1<<SPIF))); 
            clear = SPSR; 
            temp  = SPDR; 
            NOSELECT_AD; 
             
            SELECT_AD;     //选通AD芯片 
            SPDR  = 0x08; 
            while (!(SPSR&(1<<SPIF))); 
            clear = SPSR; 
            clear = SPDR; 
            ad0=(unsigned int)(temp*256)+clear; 
            SPDR  = 0x08;  //指令通道1 
            while (!(SPSR&(1<<SPIF))); 
            clear = SPSR; 
            temp=SPDR; 
            NOSELECT_AD; 
             
            SELECT_AD;     //选通AD芯片             
            SPDR  = 0x10;  //指令通道2 
            while (!(SPSR&(1<<SPIF))); 
            clear = SPSR; 
            clear = SPDR; 
            ad1=(unsigned int)(temp*256)+clear;  
            SPDR  = 0x10; 
            while (!(SPSR&(1<<SPIF))); 
            clear = SPSR; 
            temp=SPDR; 
            NOSELECT_AD; 
             
            SELECT_AD;     //选通AD芯片      
            SPDR  = 0x00;  //指令通道0 
            while (!(SPSR&(1<<SPIF))); 
            clear = SPSR; 
            clear = SPDR; 
            ad2=(unsigned int)(temp*256)+clear;   
            SPDR  = 0x00; 
            while (!(SPSR&(1<<SPIF))); 
            NOSELECT_AD; 
                     
         } 
         
void portini(void) //SPI端口初始化
{
 XBR0=0X02;
 XBR1=0X40;
 P0MDOUT=0X00;
}
void spiini(void) //设置3线SPI使能和SPI串口时钟频率为了和cs5463兼容
{
 SPI0CKR=sysclk/(2*Fsck)-1;
 SPI0CFG=0x47;          //CKPHA     CKPOL     BC2 BC1 BC0  SPIFRS2 SPIFRS1 SPIFRS0
                        //时钟相位 时钟极性   指示发送到几位      数据帧有几位
                        //
                        //
 SPI0CN=0x03;           //SPIF   WCOL        MODF   RXOVRN   TXBSY   SLVSEL  MSTEN  SPIEN
                        //SPI中断标志   写冲突标志 方式错误 接收溢出 发送忙  从选择  主方式使能 SPI使能
                        //                        
}