Why is my ATmega32 timer interrupt not executing?

hello I am beginning interfacing on the atmega32 and I am getting started with the peripherals and now I am stuck with the timers, this code isnt executing the interrupt code for some reason #include<avr/io.h> #include<util/delay.h> #include<avr/interrupt.h> int main(void){ SREG=1<<7;//enable the I-bit DDRC=0x01;//output PORTC=0x00;//initializing not depending on default values in the datasheet TCCR0=0x05;//setting the value of the prescaler TIMSK=0x03;//enabling the interrupt of overflow and compare for(;;){ } } ISR(TIMER0_OVF_vect){ PORTC^=0x01; }
33 Replies
Shousha
Shousha•4mo ago
help would be appreciated
Mr_UJ 🔋
Mr_UJ 🔋•4mo ago
on overflow ISR you have to set timer value, that to be overflowed next time
Shousha
Shousha•4mo ago
that is the only thing missing?
Shousha
Shousha•4mo ago
I think I did that but it didnt do nth w8 I will try
Mr_UJ 🔋
Mr_UJ 🔋•4mo ago
Yes, is the register settings are correct
Mr_UJ 🔋
Mr_UJ 🔋•4mo ago
in this you haven't set TCNT0 register
Mr_UJ 🔋
Mr_UJ 🔋•4mo ago
In which mode you want to use timer?? * Overflow ? * Compare ? etc?
Shousha
Shousha•4mo ago
still doesnt work
Shousha
Shousha•4mo ago
I only added the TCNT0 initial value to zero
Shousha
Shousha•4mo ago
and it still doesnt work
Shousha
Shousha•4mo ago
I am trying the overflow mode rn
Shousha
Shousha•4mo ago
I set the internal clock to 1 MHz
Shousha
Shousha•4mo ago
and reduced the prescaler value
Shousha
Shousha•4mo ago
and it still doesnt work
Mr_UJ 🔋
Mr_UJ 🔋•4mo ago
check timer register settings, is the settings correct for overflow enable?
Mr_UJ 🔋
Mr_UJ 🔋•4mo ago
looks like you set settings for capture mode
Mr_UJ 🔋
Mr_UJ 🔋•4mo ago
TIMSK0 register setting
Shousha
Shousha•4mo ago
the 0th bit is 1
Shousha
Shousha•4mo ago
and the first bit too but I got to the point that I wanted to try to see what would happen if I enabled both bits
Shousha
Shousha•4mo ago
the 0th bit enables the overflow interrupt
Mr_UJ 🔋
Mr_UJ 🔋•4mo ago
yes
Mr_UJ 🔋
Mr_UJ 🔋•4mo ago
there's different ISR routine for compare match
Shousha
Shousha•4mo ago
#include<avr/io.h> #include<util/delay.h> #include<avr/interrupt.h> #define F_CPU 1000000UL int main(void){ SREG=1<<7;//enable the I-bit DDRC=0x01;//output PORTC=0x00;//initializing not depending on default values in the datasheet TCCR0=0x01; TIMSK=0x01;//enabling the interrupt of overflow and compare TCNT0=0x00; for(;;){ } } ISR(TIMER0_OVF_vect){ PORTC^=0x01; }
Shousha
Shousha•4mo ago
attachment 0
Shousha
Shousha•4mo ago
this should work right? 😭
Mr_UJ 🔋
Mr_UJ 🔋•4mo ago
connect reset pin to high
Shousha
Shousha•4mo ago
nope.... nth
Shousha
Shousha•4mo ago
I even changed the initial value of the counter to FA
Shousha
Shousha•4mo ago
to get the overflow faster if it was a clock problem
Shousha
Shousha•4mo ago
anyways thank you for your time I will try to figure it out myself
Nayel
Nayel•4mo ago
try this :
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>

#define F_CPU 1000000UL

int main(void) {
DDRC = 0x01; // Set PORTC.0 as output
PORTC = 0x00; // Initialize PORTC.0 to low

// Timer0 configuration
TCCR0 = (1<<CS00); // Set prescaler to no prescaling (CS00=1)
TIMSK = (1<<TOIE0); // Enable Timer0 Overflow Interrupt

sei(); // Enable global interrupts

while(1) {
// Main loop does nothing, waiting for interrupt
}
}

ISR(TIMER0_OVF_vect) {
PORTC ^= 0x01; // Toggle PORTC.0
}
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>

#define F_CPU 1000000UL

int main(void) {
DDRC = 0x01; // Set PORTC.0 as output
PORTC = 0x00; // Initialize PORTC.0 to low

// Timer0 configuration
TCCR0 = (1<<CS00); // Set prescaler to no prescaling (CS00=1)
TIMSK = (1<<TOIE0); // Enable Timer0 Overflow Interrupt

sei(); // Enable global interrupts

while(1) {
// Main loop does nothing, waiting for interrupt
}
}

ISR(TIMER0_OVF_vect) {
PORTC ^= 0x01; // Toggle PORTC.0
}
also when you put code on discord please use this :
Nayel
Nayel•4mo ago
No description
Nayel
Nayel•4mo ago
Use whats inside the parenthesis
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