单片机SPI模块+74LS164驱动数码管

#include 
#ifndef _XTAL_FREQ
 #define _XTAL_FREQ 4000000
#endif
const unsigned char seg_comAnode[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
                        0x07,0x7f,0x6f};//共阳
const unsigned char seg_comCathode[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,
                        0x87,0xff,0xef};  //共阴 
/*同时发送和接收一个字节,74LS164吸电流大于拉电流，数码管接成上拉形式*/
unsigned char BUFF;
void init(){
 TRISC=0B11010111;/*RC4/SDI引脚为输出，RC5/SDO引脚为输出，从模式RC3/SCK引脚为输入*/
 SSPSTAT=0b00000000; /* 在结束时采样，在上升沿数据移位*/ 
 SSPCON=0b00110010;   /* SSPEN=1；CKP=1 ， FOSC/64，*/
 TRISD=0X00;
 PORTD=0;
}
void In_74LS164(unsigned char datas){
 SSPBUF=datas;
 do
 {
 ;
 }while(SSPIF==0);  /*等待发送完毕*/
 SSPIF=0;    /*清除SSPIF标志*/
// BUFF=SSPBUF;   /*腾空缓冲器*/
}
void main()
{unsigned char b,a,i,s=0;unsigned char m=0x01;
 init();
while(1){

     for(i=0;i<4;i++)
        {
          PORTD=~(m<        
          
 for(s=0;s<9;s++){

 In_74LS164( seg_comCathode[s]);
 __delay_ms(100);__delay_ms(100);
  } 
     }
       
      for(i=1,a=m<<4;i<4;i++)
        {
          PORTD=~(a>>i);
          
 for(s=0;s<9;s++){

 In_74LS164( seg_comCathode[s]);
 __delay_ms(100);__delay_ms(100);
  } 
     }     
}
}