/*
 * fsm-main.c: main() function 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_MAIN_C
#define FSM_MAIN_C

#include "fsm-main.h"

#if PWM_CHANNELS == 4
// 4th PWM channel requires manually turning the pin on/off via interrupt :(
ISR(TIMER1_OVF_vect) {
    //bitClear(PORTB, 3);
    PORTB &= 0b11110111;
    //PORTB |= 0b00001000;
}
ISR(TIMER1_COMPA_vect) {
    //if (!bitRead(TIFR,TOV1)) bitSet(PORTB, 3);
    if (! (TIFR & (1<<TOV1))) PORTB |= 0b00001000;
    //if (! (TIFR & (1<<TOV1))) PORTB &= 0b11110111;
}
#endif

int main() {
    // Don't allow interrupts while booting
    cli();

    #ifdef HALFSPEED
    // run at half speed
    CLKPR = 1<<CLKPCE;
    CLKPR = 1;
    #endif

    // configure PWM channels
    #if PWM_CHANNELS >= 1
    DDRB |= (1 << PWM1_PIN);
    TCCR0B = 0x01; // pre-scaler for timer (1 => 1, 2 => 8, 3 => 64...)
    TCCR0A = PHASE;
    #endif
    #if PWM_CHANNELS >= 2
    DDRB |= (1 << PWM2_PIN);
    #endif
    #if PWM_CHANNELS >= 3
    // Second PWM counter is ... weird
    DDRB |= (1 << PWM3_PIN);
    TCCR1 = _BV (CS10);
    GTCCR = _BV (COM1B1) | _BV (PWM1B);
    OCR1C = 255;  // Set ceiling value to maximum
    #endif
    #if PWM_CHANNELS >= 4
    // 4th PWM channel is ... not actually supported in hardware  :(
    DDRB |= (1 << PWM4_PIN);
    //OCR1C = 255;  // Set ceiling value to maximum
    TCCR1 = 1<<CTC1 | 1<<PWM1A | 3<<COM1A0 | 2<<CS10;
    GTCCR = (2<<COM1B0) | (1<<PWM1B);
    // set up an interrupt to control PWM4 pin
    TIMSK |= (1<<OCIE1A) | (1<<TOIE1);
    #endif

    // configure e-switch
    PORTB = (1 << SWITCH_PIN);  // e-switch is the only input
    PCMSK = (1 << SWITCH_PIN);  // pin change interrupt uses this pin

    #ifdef USE_DEBUG_BLINK
    //debug_blink(1);
    #endif

    // all booted -- turn interrupts back on
    PCINT_on();
    WDT_on();
    ADC_on();
    sei();

    // in case any spurious button presses were detected at boot
    #ifdef USE_DELAY_MS
    delay_ms(1);
    #else
    delay_4ms(1);
    #endif
    empty_event_sequence();

    // fallback for handling a few things
    #ifndef DONT_USE_DEFAULT_STATE
    push_state(default_state, 0);
    #endif

    // call recipe's setup
    setup();

    // main loop
    while (1) {
        // if event queue not empty, empty it
        process_emissions();

        // enter standby mode if requested
        // (works better if deferred like this)
        if (go_to_standby) {
            #ifdef USE_RAMPING
            set_level(0);
            #else
            #if PWM_CHANNELS >= 1
            PWM1_LVL = 0;
            #endif
            #if PWM_CHANNELS >= 2
            PWM2_LVL = 0;
            #endif
            #if PWM_CHANNELS >= 3
            PWM3_LVL = 0;
            #endif
            #if PWM_CHANNELS >= 4
            PWM4_LVL = 255;  // inverted  :(
            #endif
            #endif
            go_to_standby = 0;
            standby_mode();
        }

        // give the recipe some time slices
        loop();

    }
}

#endif