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/*
* fsm-pcint.c: PCINT (Pin Change Interrupt) functions for SpaghettiMonster.
*
* Copyright (C) 2017 Selene ToyKeeper
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef FSM_PCINT_C
#define FSM_PCINT_C
#include <avr/interrupt.h>
#include <util/delay_basic.h>
uint8_t button_is_pressed() {
// debounce a little
uint8_t highcount = 0;
// measure for 16/64ths of a ms
for(uint8_t i=0; i<BP_SAMPLES; i++) {
// check current value
uint8_t bit = ((PINB & (1<<SWITCH_PIN)) == 0);
highcount += bit;
// wait a moment
_delay_loop_2(BOGOMIPS/64);
}
// use most common value
uint8_t result = (highcount > (BP_SAMPLES/2));
//button_was_pressed = result;
return result;
}
inline void PCINT_on() {
// enable pin change interrupt for pin N
GIMSK |= (1 << PCIE);
// only pay attention to the e-switch pin
//PCMSK = (1 << SWITCH_PCINT);
// set bits 1:0 to 0b01 (interrupt on rising *and* falling edge) (default)
// MCUCR &= 0b11111101; MCUCR |= 0b00000001;
}
inline void PCINT_off() {
// disable all pin-change interrupts
GIMSK &= ~(1 << PCIE);
}
//void button_change_interrupt() {
ISR(PCINT0_vect) {
//DEBUG_FLASH;
uint8_t pushed;
// add event to current sequence
if (button_is_pressed()) {
pushed = push_event(A_PRESS);
} else {
pushed = push_event(A_RELEASE);
}
// check if sequence matches any defined sequences
// if so, send event to current state callback
if (pushed) emit_current_event(0);
}
#endif
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