按下任意按鍵后，數(shù)碼管上顯示該鍵的鍵號(hào)（0-F一位數(shù)碼管顯示）

#include <reg51.h> char led_mod[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07, //led字模0x7f,0x6f,0x77,0x7c,0x58,0x5e,0x79,0x71}; char key_buf[] = {0xee, 0xde, 0xbe, 0x7e,0xed, 0xdd, 0xbd, 0x7d,//鍵值0xeb, 0xdb, 0xbb, 0x7b,0xe7, 0xd7, 0xb7, 0x77};void getKey () interrupt 0{ //中斷函數(shù)char key_scan[] = {0xef, 0xdf, 0xbf, 0x7f}; //鍵掃描碼char i = 0, j = 0;for (i = 0; i < 4 ; i++) {P2= key_scan[i]; //輸出掃描碼 for (j = 0 ; j < 16 ;j++) {if (key_buf[j]== P2){ //讀鍵值,并判斷鍵號(hào)P0= led_mod[j]; //顯示閉合鍵鍵號(hào)break;}}}P2=0x0f; //為下次中斷做準(zhǔn)備 }void main(void) {P0 = 0x00; //開(kāi)機(jī)黑屏IT0=1; //脈沖觸發(fā)EX0=1; //INT0允許EA=1; //總中斷允許P2 = 0x0f; //為首次中斷做準(zhǔn)備,列線全為0,行線全為1while(1); //模擬其他程序功能 }

按下任意按鍵后，數(shù)碼管上顯示該鍵的鍵號(hào)（00-15兩位數(shù)碼管顯示）

#include <reg51.h> char led_mod[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07, 0x7f,0x6f,0x77,0x7c,0x58,0x5e,0x79,0x71}; char key_buf[] = {0xee, 0xde, 0xbe, 0x7e,0xed, 0xdd, 0xbd, 0x7d,0xeb, 0xdb, 0xbb, 0x7b,0xe7, 0xd7, 0xb7, 0x77}; char led_mod2[] = {0x00, 0x00};char led_point = 0; void delay(unsigned int time) { unsigned int j = 0;for(;time>0;time--)for(j=0;j<125;j++); } void getKey() interrupt 0 {char key_scan[] = {0xfe, 0xfd, 0xfb, 0xf7}; char i = 0, j = 0,k,l;P0 = 0x00;for (i = 0; i < 4 ; i++) {P2 = key_scan[i]; if ((P2 & 0xf0) != 0xf0) { for (j = 0 ; j < 16 ;j++) {if (key_buf[j]==P2) {k=j/10;l=j%10;led_mod2[0]=led_mod[k];led_mod2[1]=led_mod[l];break;}}} }P2=0xf0;led_point = 0; } void main(void) {IT0=1; EX0=1; EA=1; P2 = 0xf0; while(1){ P1 = 2 - led_point; P0 = led_mod2[led_point];led_point = 1 - led_point;delay(20);} }

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