/*
    使用此頭文件需先包含頭文件：
    #include <8051.h>
    #include <base8051.h>

*/
uchar __code smgduan[] = {
    0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07,
    0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71, 0x00};

void shumaguan(uchar duan, uchar wei)
{
    switch (duan)
    {
    case 1:
        P2 
 
&= 0xE3;  //1110 0011 相當於LSC=0；LSB=0；LSA=0;
        break;
    case 2:
        P2 &= 0xE7;  //1110 0111 相當於LSC=0；LSB=0；LSA=1;
        break;
    case 3:
        P2 &= 0xEB;  //1110 1011 相當於LSC=0；LSB=1；LSA=0;
        break;
    case 4:
        P2 &= 0xEF;  //1110 1111 相當於LSC=0；LSB=1；LSA=1;
        break
 
;
    case 5:
        P2 &= 0xF3;  //1111 0011 相當於LSC=1；LSB=0；LSA=0;
        break;
    case 6:
        P2 &= 0xF7;  //1111 0111 相當於LSC=1；LSB=0；LSA=1;
        break;
    case 7:
        P2 &= 0xFB;  //1111 1011 相當於LSC=1；LSB=1；LSA=0;
        break;
    case 8:
        P2 &= 0xFF;  //1111 1111 相當於LSC=1；LSB=1；LSA=1;
 

        break;
    
    default:
        break;
    }
    switch (wei)
    {
    case 0:
        smg_wei = smgduan[0];
        break;
    case 1:
        smg_wei = smgduan[1];
        break;
    case 2:
        smg_wei = smgduan[2];
        break;
    case 3:
        smg_wei = smgduan[3];
        break;
    case 4:
        smg_wei = smgduan[4];
        break;
    case 5:
        smg_wei = smgduan[5];
        break;
    case 6:
        smg_wei = smgduan[6];
        break;
    case 7:
        smg_wei = smgduan[7];
        break;

    default:
        break;
    }
}

Ubuntu下sdcc寫的一個基於普中V2單片機數碼管頭文件