基于 51 系列单片机控制的直流电机 PWM 调速实验

#include <reg51.h> #define uchar unsigned char #define uint unsigned int uchar shuzi[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x27,0x7f,0x6f,0x3f}; uchar show[]={0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f,0x3f}; uchar wei[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80}; sbit IN1 = P1^0; sbit IN2 = P1^1; sbit IN3 = P1^2; sbit IN4 = P1^3; sbit ENA = P1^4; sbit ENB = P1^5; sbit speed_add = P1^6; sbit speed_mus = P1^7; sbit forward = P3^5; sbit reversal = P3^6; sbit A_OR_B = P3^7; sbit TZ=P3^4; sbit A8=P3^0; sbit A9=P3^1; bit flag; uchar count=0; uchar speedA = 10; uchar speedB = 10; uint A_count=0,B_count=0,time1=0; int flag1=0,flag2=0,AR=0,BR=0; float r1 = 0,r2=0; void delay(unsigned int j) { unsigned int x; for(x=0;x<j;x++); } void A_forward() { IN1=1; IN2=0; } void A_reversal() { IN1=0; IN2=1; } void B_forward() { IN3=1; IN4=0; } void B_reversal() { IN3=0; IN4=1; } void display() { int i; if(AR==0||BR==0)show[0]=0x3f; if(AR==1||BR==1)show[0]=0x40; if(!flag){ if(flag1==1) { show[1] = shuzi[(100-speedA)/100]; show[2] = shuzi[(100-speedA)/10]; show[3] = shuzi[(100-speedA)%10]; show[4] = shuzi[(int)r1/100]; show[5] = shuzi[(int)r1/10%10]; show[6] = shuzi[(int)r1%10]|0x80; show[7] = shuzi[(int)(r1*10)%10]; flag1=0; } for(i=0; i<8; i++) { P0 = show[i]; A8 = 1; A8 = 0; P0 = ~wei[i]; A9 = 1; A9 = 0; delay(1); P0 = 0xff; A9 = 1; A9 = 0; } } if(flag){ if(flag2==1) { show[1] = shuzi[(100-speedB)/100]; show[2] = shuzi[(100-speedB)/10]; show[3] = shuzi[(100-speedB)%10]; show[4] = shuzi[(int)r2/100]; show[5] = shuzi[(int)r2/10%10]; show[6] = shuzi[(int)r2%10]|0x80; show[7] = shuzi[(int)(r2*10)%10]; flag2=0; } for(i=0; i<8; i++) { P2 = show[i]; A8 = 1; A8 = 0; P2 = ~wei[i]; A9 = 1; A9 = 0; delay(1); P2 = 0xff; A9 = 1; A9 = 0; } } } void key_scan() { if(speed_add==0) { delay(1); if(speed_add==0) { if(flag == 0) { if(speedA>0)speedA-=5; } else if(flag == 1) { if(speedB>0)speedB-=5; } while(!speed_add); return ; } } if(speed_mus==0) { delay(1); if(speed_mus==0) { if(flag==0) { if(speedA<=20)speedA+=5; } if(flag==1) { if(speedB<=20)speedB+=5; } } while(!speed_mus); return; } if(forward==0) { delay(1); if(forward==0) { if(flag == 0) { A_forward(); AR=0; } if(flag == 1) { B_forward(); BR=0; } } while(!forward); return ; } if(reversal==0) { delay(1); if(reversal==0) { if(flag == 0) { A_reversal(); AR=1; } if(flag == 1) { B_reversal(); BR=1; } } while(!reversal); return ; } if(A_OR_B==0) { delay(1); if(A_OR_B==0) { flag=~flag; } while(!A_OR_B); return ; } if(TZ==0) { delay(1); if(TZ==0) { if(flag==0) { IN1=0; IN2=0; } if(flag==1) { IN3=0; IN4=0; } } } } void main() { TMOD=0x11; TH0=(65536-10)/256; TL0=(65536-10)%256; TH1=(65536-50000)/256; TL1=(65536-50000)%256; EA=1; ET0=1; TR0=1; ET1=1; TR1=1; IT0=1; EX0=1; IT1=1; EX1=1; flag=0; while(1) { display(); key_scan(); } } void zhongduan1() interrupt 0 { A_count++; } void zhongduan2() interrupt 2 { B_count++; } void DTime1() interrupt 1 { TR0=0; TH0=(65536-10)/256; TL0=(65536-10)%256; count++; if(count==100) count=0; if(count<speedA) { ENA=0; } else{ ENA=1; } if(count<speedB) { ENB=0; } else{ ENB=1; } TR0=1; } void DTime2() interrupt 3 { TR1=0; TH1=(65536-50000)/256; TL1=(65536-50000)%256; time1++; if(time1==20) { r1=60*A_count/24.0; r2=60*B_count/24.0; time1=0; A_count=0; B_count=0; flag1=1; flag2=1; } TR1=1; }