...用C语言编写的双矩阵键盘扫描程序(5个IO口控制25个按键)答:include<reg51.h> define rowkey() (~P2)&0x0f//键盘输入端 define OUT P0 //数码管显示输出端 unsigned char code TAB[]= { 0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xC6,0xA1,0x86,0x8E,0x89,0xC7,0xC8,0xC1,0x8C,0xA3,0xBF,0xFF,0xFF ...