AVR ATMEGA88 PCINT PROBLEM

Feb 26, 2007 2 Replies
R

Hi,



I am trying to use the PCINT0 interrupt on the Atmega88 chip but an unable to get it working. i want it to work for pin number 12, 13 and 14 ie PCINT0, PCINT1 and PCINT2 respectively.



i am initializing it as



main(){ PCIFR = 0X01; PCMSK0 = 0X07; Sei(); }



AND



ISR(PCINT0_vect){ send_byte(1); }



The ISR is not getting fired using only this code. Am i missing out on some initialization. Kindly help me out.



Thanks, Rohan.



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A

You need to set the interrupt enable bit in the PCICR register, not the PCIFR register.

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R

Thanks a lot. Thats the obvious problem. How small things are overlooked unless someone else looks at it.

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