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C167 calculate rotation with Timer 3 and 4

Hello,

I'd like to calculate the speed of rotation from a conveyor band with a photoelectric sensor (switching frequency=500Hz, response time=1ms).

This sensor is connected to C167 pin 3.6 (T3IN).
The wheel from the band has 8 black colour and 8 white colours and we will get HIGH/LOW through a change from the colours.

First, I'd like to count HIGH-Signal in a certain time and then calculate the rotation speed.

Here is my code, the number always increases, although the band is off.
What did I do wrong?

How should I write the code for the calculating?

WORD T3IMAGE;

void main(){

T3CON = 0x0401;
T3 = 0;
T3IE = 1;
T3IC = 0x61;
T2CON = 0x000D;
T2 = 0;
T2IC = 0x44;
T2R = T3R =1;
IEN = 1;

while(1){

TIMAGE = T2;
set_cursor(20,5);
printf("Counter = %5u", T2);
}

T3IE = 0;
IEN = 0;
T3R = 0;
T2R = 0;
}

Thank you very much and sorry for the miserable language

Best regards,
Ciek

0 Ciek S. over 16 years ago

Hello,

I have changed the code.

void main(){

   T3CON = 0x0401;  // 0 010|0 0 0|001 T3OTL=1 Teiler 8*2=16
   T2CON = 0x000D;  // 0 0 0 1|101 Counter, rising edge in T30TL
   T2IC = 0x44;    // T2IE=1 ILVL=1 GLVL=0
   T3 = 0;
   T2 = 0;
   T3R=1;
   IEN=1;

   while(1) {

        set_cursor(13,5);
        printf("Counter = %5u", T3);
        set_cursor(14,5);
        printf("Counter = %5u", T2);
   }
}

I see now in Terminal, that T3 decrement from 65536 to 0.
If I start T2 (T2R=1), T2 is always going up.

How should I program, so that I get the value from counter in 65536 tact?

Thank you so much.