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// fsm-pcint.c: PCINT (Pin Change Interrupt) functions for SpaghettiMonster.
// Copyright (C) 2017-2023 Selene ToyKeeper
// SPDX-License-Identifier: GPL-3.0-or-later
#pragma once
#include <avr/interrupt.h>
#include <util/delay_basic.h>
uint8_t button_is_pressed() {
uint8_t value = ((SWITCH_PORT & (1<<SWITCH_PIN)) == 0);
button_last_state = value;
return value;
}
inline void PCINT_on() {
#if (ATTINY == 25) || (ATTINY == 45) || (ATTINY == 85)
// enable pin change interrupt
GIMSK |= (1 << PCIE);
// only pay attention to the e-switch pin
#if 0 // this is redundant; was already done in main()
PCMSK = (1 << SWITCH_PCINT);
#endif
// set bits 1:0 to 0b01 (interrupt on rising *and* falling edge) (default)
// MCUCR &= 0b11111101; MCUCR |= 0b00000001;
#elif (ATTINY == 1634)
// enable pin change interrupt
#ifdef SWITCH2_PCIE
GIMSK |= ((1 << SWITCH_PCIE) | (1 << SWITCH2_PCIE));
#else
GIMSK |= (1 << SWITCH_PCIE);
#endif
#elif defined(AVRXMEGA3) // ATTINY816, 817, etc)
SWITCH_ISC_REG |= PORT_ISC_BOTHEDGES_gc;
#else
#error Unrecognized MCU type
#endif
}
inline void PCINT_off() {
#if (ATTINY == 25) || (ATTINY == 45) || (ATTINY == 85)
// disable all pin-change interrupts
GIMSK &= ~(1 << PCIE);
#elif (ATTINY == 1634)
// disable all pin-change interrupts
GIMSK &= ~(1 << SWITCH_PCIE);
#elif defined(AVRXMEGA3) // ATTINY816, 817, etc)
SWITCH_ISC_REG &= ~(PORT_ISC_gm);
#else
#error Unrecognized MCU type
#endif
}
//void button_change_interrupt() {
#if (ATTINY == 25) || (ATTINY == 45) || (ATTINY == 85) || (ATTINY == 1634)
#ifdef PCINT_vect
ISR(PCINT_vect) {
#else
ISR(PCINT0_vect) {
#endif
#elif defined(AVRXMEGA3) // ATTINY816, 817, etc)
ISR(SWITCH_VECT) {
// Write a '1' to clear the interrupt flag
SWITCH_INTFLG |= (1 << SWITCH_PIN);
#else
#error Unrecognized MCU type
#endif
irq_pcint = 1; // let deferred code know an interrupt happened
//DEBUG_FLASH;
// as it turns out, it's more reliable to detect pin changes from WDT
// because PCINT itself tends to double-tap when connected to a
// noisy / bouncy switch (so the content of this function has been
// moved to a separate function, called from WDT only)
// PCINT_inner(button_is_pressed());
}
// should only be called from PCINT and/or WDT
// (is a separate function to reduce code duplication)
void PCINT_inner(uint8_t pressed) {
button_last_state = pressed;
// register the change, and send event to the current state callback
if (pressed) { // user pressed button
push_event(B_PRESS);
emit_current_event(0);
} else { // user released button
// how long was the button held?
push_event(B_RELEASE);
emit_current_event(ticks_since_last_event);
}
ticks_since_last_event = 0;
}
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