C51 pulse width detection program-EEWORLD

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/**********************************************
315 wireless module PT2262 1.5M 270KHz can measure the pulse width
start time 5000us
high level time 490us low level
time 160us HH=1 LL=0 LH=F ***************************************************/ #include typedef unsigned int uint; long plu; void delay(uint); main() { TMOD=0x09; //0x0000 1001b ET0=1; //Timer 0 interrupt enable // EX0 = 0; // Turn off INT0 EA=1; //CPU open interrupt while(1) { TH0=0x00; //Counter high 8 TL0=0x00; //Counter low 8 TF0=0; //Counter 0 overflow flag set to 0 while(INT0==1); //Wait for P3.2 to become low TR0=1; //Start the counter by INT0 while(INT0==0); //Wait for P3.2 to become highwhile (INT0==1); //Wait for P3.2 to become low againTR0=0; //T0 stops countingplu =TH0*256+TL0; //Count valueif (plu>4000) //Judge P0=0x0c; //0x0000 1100b else P0=~0x0c; P2=~P2; delay(6635); } } void delay(uint t) { while(t--); }

Keywords：C51 Reference address：C51 pulse width detection program

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