模拟电子琴C语言

1、#include MusInstru.h/*键消抖延时函数*/void delay(void)uchar i;for (i=300;i0;i-);/*键扫描函数*/uchar getkey(void)uchar scancode,tmpcode;if (P1&0 xf0)=0 xf0)return(0);scancode = 0 xfe;while(scancode&0 x10)!=0) /逐行扫描P1 = scancode;/输出行扫描码if (P1&0 xf0)!=0 xf0) /本行有键按下tmpcode = (P1&0 xf0)|0 x0f;/*返回特征

2、字节码，为1的位即对应于行和列*/return(scancode)+(tmpcode);else scancode = (scancode1)|0 x01;/行扫描码左移一/*定时器0中断服务子程序*/void time0_int(void) interrupt 1 using 0/*设置计数初值*/TH0 = STH0;TL0 = STL0;P36=P36;脉冲/*主程序*/void main()uchar key,k;TMOD = 0 x01;作方式1ET0 = 1;EA = 1;while(1)/反相，产生输出/ T0，工k = 3;P1 = 0 xf0;/发全0行扫描码if (P1&a

3、mp;0 xf0)!=0 xf0)/若有键按下delay();延时去抖动if (P1&0 xf0)!=0 xf0)次，去除抖动影响key = getkey();调用键盘扫描函数/延时后再判断/根据获取的按键位置得到k值switch(key)case 0 x11:行1列k = 0;break;/ 1行2列case 0 x21:k = 1;break;/ 1行3列case 0 x41:k = 2;break;行4列case 0 x81:/ 1/ 1break;k = 11;case 0 x12:/ 2行1列k = 4; break;case 0 x22:/ 2行2列k = 5; break

4、;case 0 x42:/ 2行3列k = 6; break;case 0 x82:/ 2行4列k = 7; break;case 0 x14:/ 3行1列k = 8; break;case 0 x24:/ 3行2列k = 9; break;case 0 x44:/ 3行3列k = 10; break;case 0 x84:/ 3行4列TR0 = 1;/break; case 0 x18:/ 3行4列k = 12; break;case 0 x28:/ 3行4列k = 13; break;case 0 x48:/ 3行4列k = 14; break;case 0 x88:/ 3行4列k = 15; break;default: break;P36 = P36;反相/*根据所得的k值设定计数器STH0 = tabk/256;STL0 = tabk%256;开始计数/1的计数初值*/P1 = 0 xf0;/发全0行扫描码while (