Proteus单片机 PWM电机正反转1（仿真实例）.rar

#include<reg52.h> #define num_sec 3 //多少秒 #define num_run 5000 //转的圈数 #define num_cry 100 //叫的次数 sbit bee=P1^7; sbit m1=P1^6; sbit m2=P1^5; sbit key=P1^4; unsigned char cir=0,num50ms=0; unsigned int n=0; void delay1ms(unsigned int count) { unsigned int i,j; for(i=0;i<count;i++) for(j=0;j<120;j++); } void cry(unsigned char c) { unsigned k; for(k=0;k<c;k++) { bee=0; delay1ms(80); bee=1; delay1ms(80); } } void time0(void) interrupt 1 using 1 { num50ms++; //STC12C2052 if(num50ms==(num_sec*20)) //20为1秒 { m1=~m1; m2=~m2; num50ms=0; cir++; } if(cir==2) { cir=0; n++; } TH0=0X4C; TL0=0; } main() { m1=1;m2=1; bee=1; while(1) { if(!key&&n==0) { delay1ms(20); if(!key) { TMOD=0x01; EA=1; ET0=1; TH0=0X4C; TL0=0; TR0=1; m1=1; m2=0; bee=0; delay1ms(100); bee=1; } while(!key); } if(n==num_run) { TR0=0; m1=1; m2=1; cry(num_cry); n=0; } } }