51单片机矩阵键盘按键C语言程序(共2页).doc

精选优质文档-倾情为你奉上#include#define uchar unsigned char#define uint unsigned intuchar smg_du=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71 ;uchar smg_we=0x08,0x18,0x28,0x38,0x48,0x58,0x68,0x78 ;/有一篇74HC573必须为高电平 /*8/12M频率下大约50US延时/*void delay_50us(uint t) uchar j; for(;t0;t-) for(j=19;j0;j-) ;void delay_50ms(uint t) uchar j; for(;t0;t-)