基于单片ＣＰＵ的8LED显示函数信号发生器设计

#include<reg52.h> //包含头文件 #include<intrins.h> #define uchar unsigned char //宏定义 #define uint unsigned int sbit s1=P3^5; //定义按键的接口 sbit s2=P3^6; sbit s3=P3^7; sbit s4=P3^4; sbit led0=P3^0; //定义四个LED，分别表示不同的波形 sbit led1=P3^1; sbit led2=P3^2; sbit led3=P3^3; sbit Wei=P2^0; sbit Wei1=P2^1; sbit Wei2=P2^2; sbit Wei3=P2^3; sbit Wei4=P2^4; sbit Wei5=P2^5; sbit Wei6=P2^6; sbit Wei7=P2^7; char num,boxing,u; //定义全局变量 int pinlv=100,bujin=1,bujin1=1; //频率初始值是100Hz，步进值默认是1，显示步进值变量 unsigned long int m; //定义长整形变量 m int a,b,h,num1; //定义全局变量 uchar code SEG_Tab1[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};//共阳数码管 段码表0-9 uchar ScanTime=1;//数码管位数扫描 uchar code sin[64]={ //此数组内的数据为，da输出对应电压值对应的数字量，0是0V，255是5V 135,145,158,167,176,188,199,209,218,226,234,240,245,249,252,254,254,253,251,247,243,237,230,222,213,204,193,182,170,158, 146,133,121,108,96,84,72,61,50,41,32,24,17,11,7,3,1,0,0,2,5,9,14,20,28,36,45,55,66,78,90,102,114,128 }; //正弦波取码 uchar code juxing[64]={ //一个周期是采样64个点， 所以数组内是64个数据 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, 255,255,255,255,255,255,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 }; //矩形波取码 uchar code sanjiao[64]={ 0,8,16,24,32,40,48,56,64,72,80,88,96,104,112,120,128,136,144,152,160,168,176,184,192,200,208,216,224,232,240,248, 248,240,232,224,216,208,200,192,184,176,168,160,152,144,136,128,120,112,104,96,88,80,72,64,56,48,40,32,24,16,8,0 }; //三角波取码 uchar code juchi[64]={ 0,4,8,12,16,20,24,28,32,36,40,45,49,53,57,61,65,69,73,77,81,85,89,93,97,101,105,109,113,117,121,125,130,134,138,142, 146,150,154,158,162,166,170,174,178,182,186,190,194,198,202,206,210,215,219,223,227,231,235,239,243,247,251,255 }; //锯齿波取码 void delay(uint xms) //延时函数 { int a,b; for(a=xms;a>0;a--) for(b=110;b>0;b--); } void initclock() //定时器初始化函数 { TMOD=0x01; //定时器的工作方式 TH0=a; TL0=b; //定时器赋初值 EA=1; //打开中断总开关 ET0=1; //打开定时器允许中断开关 TR0=1; //打开定时器定时开关 } void display() //显示函数 { uchar qian,bai,shi,ge; //定义变量用于显示 qian=pinlv/1000; //将频率值拆成一位的数据，将数据除以1000，得到的商是一位数，赋值给qian bai=pinlv%1000/100; //将频率除以1000的余数再除以100就得到了频率的百位，赋值给bai shi=pinlv%1000%100/10; //同上，得到频率的十位 ge=pinlv%1000%100%10; P0=0xFF; P2=0x00; switch(ScanTime) { //----------数码管第一位-------------- case 1: P0=SEG_Tab1[qian]; Wei=1; break; case 2: P0=SEG_Tab1[bai]; Wei1=1; break; case 3: P0=SEG_Tab1[shi]; Wei2=1; break; case 4: P0=SEG_Tab1[ge]; Wei3=1; break; case 5: P0=SEG_Tab1[4]; Wei4=0; break; case 6: P0=SEG_Tab1[5]; Wei5=0; break; case 7: P0=SEG_Tab1[6]; Wei6=0; break; case 8: P0=SEG_Tab1[7]; Wei7=0; break; //------------------default--------------- default: break; } //-----数码管循环------ ScanTime++; if(ScanTime>=9) { ScanTime=1;//循环扫描 } ; if(boxing==0) //判断波形为正弦波 { led3=1; led0=0; //点亮正弦波指示灯 } if(boxing==1) //注释同上 { led0=1; led1=0; } if(boxing==2) { led1=1; led2=0; } if(boxing==3) { led2=1; led3=0; } } void keyscan() //频率调节键盘检测函数 { if(s1==0) //加按键是否按下 { EA=0; //关闭中断 delay(2); //延时去抖 if(s1==0) //再次判断 { while(!s1); //按键松开 pinlv+=bujin; //频率以步进值加 if(pinlv>1000) //最大加到1000Hz { pinlv=100; //1000Hz } display(); //显示函数 m=65536-(150000/pinlv);//计算频率 a=m/256; //将定时器的初值赋值给变量 b=m%256; EA=1; //打开中断总开关 } } if(s2==0) //减按键按下 { delay(5); if(s2==0) { EA=0; while(!s2); pinlv-=bujin; //频率以步进值减 if(pinlv<100) { pinlv=1000; } display(); m=65536-(150000/pinlv); a=m/256; b=m%256; EA=1; } } if(s3==0) //波形切换按键 { delay(5); if(s3==0) { EA=0; while(!s3); boxing++; //波形切换 if(boxing>=4) //4种波形 { boxing=0; } display(); EA=1; } } } void bujinjiance() //步进值设置键盘程序 { if(s4==0) //步进设置按键按下 { delay(5); //延时去抖 if(s4==0) //再次判断按键 { while(!s4); //按键释放，按键松开才继续向下执行 h++; //变量加 if(h==1) //进入设置状态时 { bujin1=bujin; //步进值赋值给临时变量 } if(h==2) //退出设置 { h=0; //清零 bujin=bujin1; //设置好的临时步进值赋值给步进变量 initclock(); //定时器初始化 display(); //调用显示程序 } } } if(h==1) //设置步进值时 { if(s1==0) //加按键按下 { delay(5); //延时去抖 if(s1==0) //再次判断 { while(!s1); //按键释放 bujin1++; //步进值加1 if(bujin1>=101) //步进值最大100，也就是1000Hz { bujin1=1; //超过最大值就恢复到1Hz } } } if(s2==0) //减按键，注释同上 { delay(5); if(s2==0) { while(!s2); bujin1--; //步进减 if(bujin1<=0) { bujin1=100; } } } } } void main() //主函数 { m=65536-(150000/pinlv); //定时器初值 a=m/256; b=m%256; initclock(); //定时器初始化 led0=0; //点亮第一个波形指示灯 while(1) //进入while循环，括号内为1，一直成立，所以也叫死循环，程序不会跳出，一直在内执行 { if(h==0) //正常模式不是步进调节 { keyscan(); //扫描按键 display(); } bujinjiance(); //扫描步进调节程序 switch(boxing) //选择波形 { case 0 : P1=sin[u]; break; //正弦波 case 1 : P1=juxing[u]; break; //矩形波 case 2 : P1=sanjiao[u]; break; //三角波 case 3 : P1=juchi[u]; break; //锯齿波 } } } void T0_time()interrupt 1 //定时器 { TH0=a; TL0=b; //根据不同的初值，定时器定时时间不同，达到不同频率的目的 u++; //变量加 if(u>=64) //一个周期采样64个点， 所以加到64就清零 u=0; //u清零 }