PWM and Delay Issues

Projects Programming
1

I'm having a strange issue with analogWrite() and delay() within my program. I'm not exactly sure what the issue is since my code worked fine on my ardunio Uno but fails on a custom PCB using the ATMEGA328P-AU (same as arduino pro mini) at 5V and 16Mhz. I'm using two PWM outputs on pin 3 and pin 5. Here is what I have for debugging purposes.

void setup(){
pinMode(3,OUTPUT);
}
void loop(){
analogWrite(3,0);
delay(1000);
analogWrite(3,255);
delay(1000);
}

if I have that simple code, pin 3 never goes high, same results if I do digitalWrite(). Now if I start with analogWrite(3,255) and then set it low 1000ms later, it works. I figure its some timer/interrupt issue, but how I do i get around it without changing pins since I already have the PCB made. I don't even need to use PWM, digitalWrite would be fine.

2

Why not just use digitalWrite then?

void loop(){
   digitalWrite(3,LOW);
   delay(1000);
   digitalWrite(3,HIGH);
   delay(1000);
}
3

well I could go without PWM, but I rather have it. I think I found the issue, I was importing <avr/interrupt.h> since my earlier code was using it, but forgot to remove the include when removing the code. For some reason, when I removed the include, it seems to work fine now.