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C167 calculate rotation with Timer 3 and 4

Ciek S.

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

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