Bus-matrix-keyboard-design-128-key.rar_Matrix key

/*通用数码显示模板*/ /*作者：田开坤*/ /*时间：2010年11月*/ #include <reg52.h> #include <absacc.h> #define TIME_PER_SEC 600 //定义数码管扫描频率，8*40Hz #define CLOCK 22118400 //定义时钟晶振，单位Hz #define KEY 0xB700 sbit SH_CP = P2^4; sbit ST_CP = P1^5; sbit DS = P2^5; unsigned char led_buff[8]={0,0,0,0,0,0,0,0}; unsigned char xdata *pKey; unsigned char key; void write_595(unsigned char d) { unsigned char i; for(i=0;i<8;i++) { DS = d&0x01; //发送最低位 SH_CP = 1; SH_CP = 0; //移位寄存器移位 d = d>>1; //数据移位 } } void seg595_init() { SH_CP = 0; ST_CP = 0; DS = 0; write_595(0); write_595(0); ST_CP = 1; ST_CP = 0; } //定时器0初始化 void timer0_init(void) { TMOD = 0x01; //定时器0工作在模式1，16Bit定时器模式 TH0 = (65536-CLOCK/TIME_PER_SEC/12) / 256; TL0 = (65536-CLOCK/TIME_PER_SEC/12) % 256; TR0 =1; ET0 =1;//开启定时器和中断 } void main() { unsigned char temp; seg595_init(); timer0_init(); EA=1; pKey = KEY; while(1) { if(key!=temp) { temp=key; led_buff[7]=temp%10; led_buff[6]=temp/10%10; led_buff[5]=temp/100%10; } } } void timer0_int(void) interrupt 1 { unsigned char code led_seg[]={0x03,0x9f,0x25,0x0d,0x99,0x49,0x41,0x1f,0x01,0x09}; unsigned char code led_bit[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80}; unsigned char code key_tab[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f}; static unsigned char cycle=0; unsigned char temp,i,j; TH0 = (65536-CLOCK/TIME_PER_SEC/12) / 256; TL0 = (65536-CLOCK/TIME_PER_SEC/12) % 256; i = cycle & 0x07; write_595(led_seg[led_buff[i]]); write_595(led_bit[i]); ST_CP=1;ST_CP=0; i = cycle & 0x0f; temp = *(pKey+i);//扫描键盘 if(temp!=0xff) { for(j=100;j>0;j--); //适当延时去抖动 temp = *(pKey+i); if(temp!=0xff) { for(j=0;j<8;j++) if(temp==key_tab[j]) break; key = i + (j<<4); //相当于i+j*16 } } cycle++; }