U2是什么元件

終于找到關于多個數碼管動態顯示的帖子了

請問使用矩陣鍵盤的話應該怎么改


// 矩陣鍵盤讀取按鍵鍵碼
unsigned char MatrixKey()
{
    unsigned char KeyNumber = 0;

    P1 = 0xFF;
    P1_3 = 0;
    if (P1_7 == 0) {Delay_ms(20); while (P1_7 == 0); Delay_ms(20); KeyNumber = 16;}
    if (P1_6 == 0) {Delay_ms(20); while (P1_6 == 0); Delay_ms(20); KeyNumber = 15;}
    if (P1_5 == 0) {Delay_ms(20); while (P1_5 == 0); Delay_ms(20); KeyNumber = 14;}
    if (P1_4 == 0) {Delay_ms(20); while (P1_4 == 0); Delay_ms(20); KeyNumber = 13;}

    P1 = 0xFF;
    P1_2 = 0;
    if (P1_7 == 0) {Delay_ms(20); while (P1_7 == 0); Delay_ms(20); KeyNumber = 12;}
    if (P1_6 == 0) {Delay_ms(20); while (P1_6 == 0); Delay_ms(20); KeyNumber = 11;}
    if (P1_5 == 0) {Delay_ms(20); while (P1_5 == 0); Delay_ms(20); KeyNumber = 10;}
    if (P1_4 == 0) {Delay_ms(20); while (P1_4 == 0); Delay_ms(20); KeyNumber = 9;}

    P1 = 0xFF;
    P1_1 = 0;
    if (P1_7 == 0) {Delay_ms(20); while (P1_7 == 0); Delay_ms(20); KeyNumber = 8;}
    if (P1_6 == 0) {Delay_ms(20); while (P1_6 == 0); Delay_ms(20); KeyNumber = 7;}
    if (P1_5 == 0) {Delay_ms(20); while (P1_5 == 0); Delay_ms(20); KeyNumber = 6;}
    if (P1_4 == 0) {Delay_ms(20); while (P1_4 == 0); Delay_ms(20); KeyNumber = 5;}

    P1 = 0xFF;
    P1_0 = 0;
    if (P1_7 == 0) {Delay_ms(20); while (P1_7 == 0); Delay_ms(20); KeyNumber = 4;}
    if (P1_6 == 0) {Delay_ms(20); while (P1_6 == 0); Delay_ms(20); KeyNumber = 3;}
    if (P1_5 == 0) {Delay_ms(20); while (P1_5 == 0); Delay_ms(20); KeyNumber = 2;}
    if (P1_4 == 0) {Delay_ms(20); while (P1_4 == 0); Delay_ms(20); KeyNumber = 1;}

    return KeyNumber;
}