单纯数码管的显示C程序
#include   
       #define    HC595_SER     RB7
       #define    HC595_SCK      RB6
       #define    HC595_RCK      RB5
       #define    key_164_data    RB3
       #define    key_164_clk     RB2
       #define    key_com1        RB1
       #define    key_com0        RB0
#define    TURE    1

bit    key_finish;       //定义位变量，这是PICmate仿真软件环境的特有的地方    unsigned int    sample_key;
       unsigned int    sample_keyBuf[2];
       unsigned int    key_value;
       unsigned char key_row_sel;
       unsigned char key_number;//键号
       unsigned int    T100ms;
       unsigned char disbuf[8];
       const unsigned char seven_seg[16]=
{0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
       //----------------------------------------------
       void disbuf_update(void)
      {
          //if(key_number>=16)
          //{
               //disbuf[0]=0xff;
               //disbuf[1]=0xff;
               //disbuf[2]=0xff;
               //disbuf[3]=0xff;
               //disbuf[4]=0xff;
               //disbuf[5]=0xff;
               //disbuf[6]=0xff;
               //disbuf[7]=0xff;
               //return;
          //}
           disbuf[0]=seven_seg[1];
           disbuf[1]=seven_seg[2];
           disbuf[2]=seven_seg[3];
           disbuf[3]=seven_seg[4];
           disbuf[4]=seven_seg[5];
           disbuf[5]=seven_seg[6];
           disbuf[6]=seven_seg[7];
           disbuf[7]=seven_seg[8];
       }
       //----------------------------------------------
      //发送一个字节
       void s_pData(unsigned char key)          //形参key对应着实参disbuf[i]
      {
           unsigned char i;
              for(i=0;i<8;i++)
          {
            if(0x80&(key<                 HC595_SER=1;
            else HC595_SER=0;
              HC595_SCK=0;
              HC595_SCK=1;
         }
       }
       //----------------------------------------------
      void display (void)
     {
         unsigned char i;
         for(i=0;i<8;i++)
             s_pData(disbuf[i]);
         HC595_RCK=0;
         HC595_RCK=1;
     }
     //----------------------------------------------

      //主程序
      int main(void)
     {
          PORTB=0;
          TRISB=0x03;
          disbuf_update();
          display();
      }
      //----------------------------------------------

它的电路图可以参考用PIC16F877A单片机驱动按键控制8个数码管的显示电路图.