mirror of
https://github.com/mcgurk/Arduino-USB-HID-RetroJoystickAdapter
synced 2024-11-30 21:02:19 -05:00
50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
#define LED_PIN 5 // digital pin #13 (portb) (pin #9 with Arduino Pro Micro)
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#define LED_ON() PORTB |= _BV(LED_PIN)
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#define LED_OFF() PORTB &= ~_BV(LED_PIN)
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volatile uint8_t output1;
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volatile uint8_t output2;
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ISR(INT0_vect, ISR_NAKED)
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{
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asm volatile(
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" push r0 \n" // save register r0
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" lds r0, output1 \n"
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" out %[pin], r0 \n"
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" pop r0 \n" // restore previous r0
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" rjmp INT0_vect_part_2 \n" // go to part 2 for required prologue and epilogue
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:: [pin] "I" (_SFR_IO_ADDR(PORTB)));
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}
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ISR(INT0_vect_part_2) {
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}
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ISR(INT1_vect, ISR_NAKED)
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{
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asm volatile(
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" push r0 \n" // save register r0
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" lds r0, output2 \n"
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" out %[pin], r0 \n"
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" pop r0 \n" // restore previous r0
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" rjmp INT1_vect_part_2 \n" // go to part 2 for required prologue and epilogue
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:: [pin] "I" (_SFR_IO_ADDR(PORTB)));
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}
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ISR(INT1_vect_part_2) {
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}
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void setup() {
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//pinMode(13, OUTPUT); // Arduino Uno
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pinMode(9, OUTPUT); // Arduino Pro Micro
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TIMSK0 = 0; // disable timer0 interrupts (Arduino Uno/Pro Micro millis() update ISR)
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EICRA = B1011; // INT0 – rising edge on 2 (B11), INT1 - falling edge on 3 (B10xx)
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EIMSK = B11; // enable int0 (Bx1) and int1 (B1x)
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}
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void loop() {
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LED_ON();
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//LED_OFF();
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output1 = 0;
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delayMicroseconds(50);
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}
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