PIC16F877A count function - Electronic Circuits Projects Diagrams Free

aladdin83 · 22nd January 2009, 01:58 AM

Hi all,

I am using PIC16F877A ucontroller to control a cart. The PWM pins are both used to drive the dc motors I have on the cart. I read in the manual that I can use a count function on other pins.

I tried to use the function with Port B pin 7 and display the result on LCD
The LCD works fine, I can display the A/D result and other text

when using the count function the code is COUNT PIN, PERIOD IN us, var
its suppose to count how many times the the pin goes TRUE/FALSE in a period of time and store the value in a variable

the LCD always show 1 as the result.

I tried to move the count function outside the main program loop and nothing happend..

did anyone use this function beofre? any suggestions?

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22nd January 2009, 01:58 AM	#1
aladdin83	PIC16F877A count function Hi all, I am using PIC16F877A ucontroller to control a cart. The PWM pins are both used to drive the dc motors I have on the cart. I read in the manual that I can use a count function on other pins. I tried to use the function with Port B pin 7 and display the result on LCD The LCD works fine, I can display the A/D result and other text when using the count function the code is COUNT PIN, PERIOD IN us, var its suppose to count how many times the the pin goes TRUE/FALSE in a period of time and store the value in a variable the LCD always show 1 as the result. I tried to move the count function outside the main program loop and nothing happend.. did anyone use this function beofre? any suggestions?