/*
 *  spreadspace avr utils
 *
 *
 *  Copyright (C) 2013-2018 Christian Pointner <equinox@spreadspace.org>
 *
 *  This file is part of spreadspace avr utils.
 *
 *  spreadspace avr utils 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
 *  any later version.
 *
 *  spreadspace avr utils 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 spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
 */


#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include <avr/power.h>
#include <util/delay.h>

#include "util.h"
#include "led.h"

#include "usbio.h"
#include <stdio.h>


// Dustsensor defines:
#include <LUFA/Drivers/Peripheral/ADC.h>

#define PIN_HIGH(PORT, PIN) PORT |= (1 << PIN)
#define PIN_LOW(PORT, PIN) PORT &= ~(1 << PIN)

#define OP_SETBIT |=
#define OP_CLEARBIT &= ~
#define OP_CHECK &
#define PIN_SW(PORTDDRREG, PIN, OP) PORTDDRREG OP (1 << PIN)

#define HIGHv OP_SETBIT
#define LOWv OP_CLEARBIT
#define DUSTS_LED(OP) PIN_SW(PORTF, PF0, OP)

#define DUSTS_ADC_NUM 0
#define DUSTS_ADC_MUX_MASK ADC_CHANNEL0


void dusts_init(void)
{
    DDRF = (1 << PF0);
    DUSTS_LED(HIGHv);
    //ADC_Init(ADC_SINGLE_CONVERSION);
    ADC_Init(ADC_FREE_RUNNING | ADC_PRESCALE_32);
    ADC_SetupChannel (DUSTS_ADC_NUM);
}

int16_t dusts_measure(void) {
    DUSTS_LED(LOWv);
    _delay_us(280);
    //measure ADC
    ADC_GetChannelReading(ADC_REFERENCE_INT2560MV | ADC_RIGHT_ADJUSTED | DUSTS_ADC_MUX_MASK);
    _delay_us(40);
    DUSTS_LED(HIGHv);
    return ADC_GetResult();
}





void handle_cmd(uint8_t cmd)
{
  int16_t mv=0;
  switch(cmd) {
      case 'm': mv = dusts_measure();  printf("Dust Value: %d\r\n", mv); break;
      case 'r': reset2bootloader(); break;
      default: printf("error\r\n"); return;
  }
}

int main(void)
{
  MCUSR &= ~(1 << WDRF);
  wdt_disable();
  led_init();
  led_on();
  cpu_init();
  usbio_init();
  dusts_init();
  sei();

  for(;;) {
    led_off();
    int16_t BytesReceived = usbio_bytes_received();
    while(BytesReceived > 0) {
      int ReceivedByte = fgetc(stdin);
      if(ReceivedByte != EOF) {
        handle_cmd(ReceivedByte);
      }
      BytesReceived--;
    }
    usbio_task();
    led_on();
    _delay_ms(100);
  }
}