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Registered Member #3885
Joined: Sun May 15 2011, 12:47AM
Location: Newton, Massachusetts, United States
Posts: 94
Hi all!
I'm just getting started with AVR C and I'm having trouble setting up an interrupt on my ATTiny85V.
I have LEDs connected to Port B bits 1 - 4 and a pushbutton to ground connected to Port B bit 0. With this code, I am able to detect the state of the button (if it is currently being pushed or not), but the ISR is not called (I set an interrupt on PCINT0, and I only enabled source 0, so my pushbutton should trigger the ISR).
Any help at all would be appreciated! Normally, the code just fades the LEDs back and forth.
UPDATE: a friend pointed out that _SEI() isn't being called where it is in this code, so global interrupts are not being enabled, but when I move it into main or setupInterrupts, I get an undefined reference error - any suggestions?
FIXED!
It needs to be sei(), not _SEI()
hope this helps someone else who's having trouble!
#include <avr/io.h>
#define F_CPU 800000UL #include <util/delay.h>
#include <avr/interrupt.h> _SEI(); //Enable Global Interrupts
#define TRUE 1 #define FALSE 0 typedef int boolean;
int main(void) { //Set all pins as outputs DDRB = 0xff; //Enable response to interrupts setupInterrupts();
//Set all outputs low, enables internal pull-up on input pin 0 PORTB = 0x01;
//Main program cycle while(1) { //This tells us if an interrupt has been detected - use for debugging if(interruptFlag) { PORTB = 0xff; _delay_ms(100); PORTB = 0x01; _delay_ms(100);
if(PINB & (1 << 0) == 1) { //Makes the LEDs glow dimly if the button has not been pressed - use for debugging PORTB = 0xff; }
blink();
updateDelay(); }
return(0); };
void blink() { //Start the first LED with low pulsewidth PORTB = pullUp | leadingByte; _delay_xus(delayTime);
///Start the second LED with high pulsewidth if(cylonUp) {PORTB = pullUp | leadingByte >> 1;} else {PORTB = pullUp | leadingByte << 1;} _delay_xus(1000 - delayTime); };
void updateDelay() { //Goes to the next set of LEDs once the leading LED has reached maximum pulsewidth if(delayTime == 1000) { setNextByte(); delayTime = 0; } //If the leading LED has not reached maximum pulsewidth, increase the pulsewidth else { delayTime += 10; } };
//This methods lets us use a variable with the _delay_us method instead of a constant void _delay_xus(int us) { while (us--) { _delay_us(1); } };
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Help With Interrupts in AVR C
