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Create interrupt_test.ino

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Jarno Lehtinen 2018-12-06 14:28:09 +02:00 committed by GitHub
parent cac157a770
commit 1db7efcd59
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1 changed files with 49 additions and 0 deletions
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C64_4joy_adapter/interrupt_test.ino Normal file
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#define LED_PIN 5 // digital pin #13 (portb) (pin #9 with Arduino Pro Micro)
#define LED_ON() PORTB |= _BV(LED_PIN)
#define LED_OFF() PORTB &= ~_BV(LED_PIN)
volatile uint8_t output1;
volatile uint8_t output2;
ISR(INT0_vect, ISR_NAKED)
{
asm volatile(
" push r0 \n" // save register r0
" lds r0, output1 \n"
" out %[pin], r0 \n"
" pop r0 \n" // restore previous r0
" rjmp INT0_vect_part_2 \n" // go to part 2 for required prologue and epilogue
:: [pin] "I" (_SFR_IO_ADDR(PORTB)));
}
ISR(INT0_vect_part_2) {
}
ISR(INT1_vect, ISR_NAKED)
{
asm volatile(
" push r0 \n" // save register r0
" lds r0, output2 \n"
" out %[pin], r0 \n"
" pop r0 \n" // restore previous r0
" rjmp INT1_vect_part_2 \n" // go to part 2 for required prologue and epilogue
:: [pin] "I" (_SFR_IO_ADDR(PORTB)));
}
ISR(INT1_vect_part_2) {
}
void setup() {
//pinMode(13, OUTPUT); // Arduino Uno
pinMode(9, OUTPUT); // Arduino Pro Micro
TIMSK0 = 0; // disable timer0 interrupts (Arduino Uno/Pro Micro millis() update ISR)
EICRA = B1011; // INT0 – rising edge on 2 (B11), INT1 - falling edge on 3 (B10xx)
EIMSK = B11; // enable int0 (Bx1) and int1 (B1x)
}
void loop() {
LED_ON();
//LED_OFF();
output1 = 0;
delayMicroseconds(50);
}