pwm波.zip_labview编程_混合编程_电机PWM自动转速控制

#pragma db code #include<reg51.h> #define uchar unsigned char void rece(void); void init(void); uchar re[17]; unsigned int c; unsigned char timer1; sbit PWM=P1^2; //void system_Ini(void); void speed(void); void main(void) { uchar temp; init(); while(1){ speed(); // while(RI==0); // temp=SBUF; // if(temp==0x00) // { speed(); rece(); // } //else break; } } void init(void) { TMOD=0x21; PCON=0x80; SCON=0x50; TL1=0x33; //本来是0xF3 改为0x33仍然可以 TH1=0xF3; TR1=1; TH0 = 0xFe; //11.0592 //0xfe和0xf3均可 TL0 = 0x0c; //改过之后就不行了 必须是0x33 TR0 = 1; IE=0x82; } void rece(void) { char i; i=0; do{ while(RI==0){speed();}; re[i]=SBUF; //注释掉只能返回00 RI=0; //SBUF=re[i]; //注释掉无返回 c=re[i]; SBUF=c; while(TI==0){speed();}; TI=0; i++; speed(); }while(re[i-1]!=255); } //void system_Ini() //{ // TMOD= 0x21; // //PWM // TH0 = 0xFe; //11.0592 //0xfe和0xf3均可 // TL0 = 0x0c; //改过之后就不行了 必须是0x33 // TR0 = 1; // IE =0x82; //} void speed(void) { if(timer1>100) timer1=0; if(timer1<(100-c)) PWM=0; // if(timer1==0) PWM=1; else PWM=1; } void T1zd(void) interrupt 1 //3 为定时器1的中断号 1 定时器0的中断号 0 外部中断1 2 外部中断2 4 串口中断 { TH0 = 0xFe; //11.0592 TL0 = 0x0c; timer1++; }