Do debounce in software instead.
On Tue, 14 Jan 2014 17:54:19 +0100
dfx <d...@dfx.it> wrote:
> Please consider this code:
>
> #define KEY_PORT PORTD
> #define KEY_DDR DDRD
> #define KEY_FUNC_SEL PIND4 // --> first key (Port D pin 4)
> ....
> #define LED_PORT PORTB // Test led, to see action on keypress
> ....
>
> #define FUNC_SEL_KEY 0x10 // First function --> first key (Port D pin
> 4) ....
>
> int main() {
> init();
>
> while (1) {
> // waits indefinitely for keypress
> }
> return (EXIT_SUCCESS); // Never reached
> }
>
> void init() {
> cli();
> LED_DDR |= (1 << DDB0); // Led out Port B pin 0
>
> KEY_PORT |= (1 << PORTD4) ; // pull-up resistor
> PCICR |= (1 << PCIE3); // Enable interrupts on PORTD (PCINT31:24)
>
> PCMSK0 = 0X00; // Disable unnecessary
> PCMSK1 = 0X00;
> PCMSK2 = 0X00;
> PCMSK3 |= (1 << PCINT28); // Enable key
> sei();
> }
>
> ISR(PCINT3_vect) { // FUNCTION KEY
> uint8_t i;
>
> i = PORTD;
> if ((i & FUNC_SEL_KEY) > 0) { // Test a key
> LED_PORT |= (1 << PORTB0);
> _delay_ms(100);
> LED_PORT &= ~(1 << PORTB0);
> _delay_ms(300);
> }
> reti();
> }
>
>
> ISR(BADISR_vect) {
> LED_PORT |= (1 << PORTB0);
> _delay_ms(200);
> LED_PORT &= ~(1 << PORTB0);
> _delay_ms(200);
> LED_PORT |= (1 << PORTB0);
> _delay_ms(200);
> LED_PORT &= ~(1 << PORTB0);
> _delay_ms(200);
> LED_PORT |= (1 << PORTB0);
> _delay_ms(200);
> LED_PORT &= ~(1 << PORTB0);
> _delay_ms(200);
> reti();
> }
>
> the button has a capacitor 1uF for debouncing (together with the
> pull-up from 10 kohm)
>
> The result is the following:
>
> when I press the button, are generated two flashes (instead of one),
> and when I release the button are generated two more flashes.
>
> Similarly, If I comment out the routine (ISR PCINT3_vect),
> the error routine (ISR BADISR_vect) generates double of the
> expected flashes.
>
> Can anyone help me to understand the problem?
>
> Thank you very much.
>
>
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