仿真原理图如下（proteus仿真工程文件可到本帖附件中下载）
单片机源程序如下:
- #include "reg51.h"
- #include <data.h>
- #include <LCD1602.h>
- #define uchar unsigned char
- #define uint unsigned int
- #define key P1
- #define dataout P3
- uchar fre[5] ="001Hz";
- uint data THHL=65536-3906;
- uchar data keyword,n=0;
- uchar data Signal_chose = 0;
- uchar data div = 1;
- void keyscan()
- {
- keyword=key&0x3f;
- if(keyword!=0x3f)
- {
- while((key&0x3f)!=0x3f); //等待按键松开
- switch(keyword)
- {
- case 62: {
- if(div>=100) THHL=65536-39; else {div++;THHL=65536-3906/div;}//频率up
- fre[0]=div/100 + '0';fre[1]=div/10%10 + '0';fre[2]=div%10 + '0';
- TR1=0;LCD_send(2,11,fre,5);TR1=1; break;
- }
- case 61: {
- if(div<=1) THHL=65536-3906; else {div--;THHL=65536-3906/div;}//频率down
- fre[0]=div/100 + '0';fre[1]=div/10%10 + '0';fre[2]=div%10 + '0';
- TR1=0;LCD_send(2,11,fre,5);TR1=1; break;
- }
-
- case 59: {Signal_chose=0;TR1=0;LCD_send(1,5,"Sin ",10);TR1=1; break;} //正弦波
- case 55: {Signal_chose=1;TR1=0;LCD_send(1,5,"Triangular",10);TR1=1; break;} //三角波
- case 47: {Signal_chose=2;TR1=0;LCD_send(1,5,"Square ",10);TR1=1; break;} //方波
- case 31: {Signal_chose=3;TR1=0;LCD_send(1,5,"Sawtooth ",10);TR1=1; break;} //锯齿波
- default:{break;}
- }
- }
- }
-
- void init() //初始化
- {
- key=0x3f;P2=0x00;dataout=0x00;THHL=65536-3906; ///初始频率为1Hz
- TH1=THHL/256;TL1=THHL%256;
- TMOD=0x11;ET1=1;TR1=1;EA=1;
- }
-
- void main()
- {
- LCD_init();
- LCD_send(1,0,"Type:Sin",8);
- LCD_send(2,0,"frequency:",10);
- LCD_send(2,11,fre,5);
- init();
- while(1)
- {
- keyscan();
- switch(Signal_chose)
- {
- case 0: {dataout=sin_tab[n]; break;} //正弦波
- case 1: {dataout=thr_tab[n]; break;} //三角波
- case 2: {dataout=squ_tab[n]; break;} //方波
- case 3: {dataout=255-n;break;} //锯齿波
- default:{break;}
- }
- }
- }
-
- void time_intt1(void) interrupt 3
- {
- TL1=THHL%256;TH1=THHL/256;
- // if(n>=255) {n=0;} else {n++;}
- n++;
- }
Keil5代码与Proteus8.8仿真下载:
信号发生器Proteus仿真程序.7z
(87.94 KB, 下载次数: 57)
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