/*
 *  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 <stdio.h>

#include "serialio.h"
#include "led.h"

/*
             LUFA Library
     Copyright (C) Dean Camera, 2014.

  dean [at] fourwalledcubicle [dot] com
           www.lufa-lib.org
*/
#include <LUFA/Version.h>
#include <LUFA/Drivers/USB/USB.h>
#include "lufa-descriptor-midi.h"

/** LUFA MIDI Class driver interface configuration and state information. This structure is
 *  passed to all MIDI Class driver functions, so that multiple instances of the same class
 *  within a device can be differentiated from one another.
 */
USB_ClassInfo_MIDI_Device_t Keyboard_MIDI_Interface =
  {
    .Config =
      {
        .StreamingInterfaceNumber = INTERFACE_ID_AudioStream,
        .DataINEndpoint           =
          {
            .Address          = MIDI_STREAM_IN_EPADDR,
            .Size             = MIDI_STREAM_EPSIZE,
            .Banks            = 1,
          },
        .DataOUTEndpoint          =
          {
            .Address          = MIDI_STREAM_OUT_EPADDR,
            .Size             = MIDI_STREAM_EPSIZE,
            .Banks            = 1,
          },
      },
  };


/** Event handler for the library USB Configuration Changed event. */
void EVENT_USB_Device_ConfigurationChanged(void)
{
  bool ConfigSuccess = true;

  ConfigSuccess &= MIDI_Device_ConfigureEndpoints(&Keyboard_MIDI_Interface);
}

/** Event handler for the library USB Control Request reception event. */
void EVENT_USB_Device_ControlRequest(void)
{
  MIDI_Device_ProcessControlRequest(&Keyboard_MIDI_Interface);
}

/* end LUFA MIDI Class driver specific definitions*/

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

#define KEY_PIN PINB
#define KEY_PORT PORTB
#define KEY_DDR DDRB
#define KEY_BIT 0

#define KEY_LP_MAX 255

void key_init(void)
{
  KEY_DDR = (1<<KEY_BIT);
  KEY_PORT = (1<<KEY_BIT);
}

int main(void)
{
  MCUSR &= ~(1 << WDRF);
  wdt_disable();

  cpu_init();
  led_init();
  key_init();
  serialio_init(38400, 0);
  USB_Init();
  sei();

  MIDI_EventPacket_t MIDIEventOn = (MIDI_EventPacket_t)
    {
      .Event       = MIDI_EVENT(0, MIDI_COMMAND_NOTE_ON),
      .Data1       = MIDI_COMMAND_NOTE_ON | 0,
      .Data2       = 0,
      .Data3       = 0x7F,
    };
  MIDI_EventPacket_t MIDIEventOff = (MIDI_EventPacket_t)
    {
      .Event       = MIDI_EVENT(0, MIDI_COMMAND_NOTE_OFF),
      .Data1       = MIDI_COMMAND_NOTE_OFF | 0,
      .Data2       = 0,
      .Data3       = 0,
    };

  static uint8_t last_state = (1<<KEY_BIT);
  static uint8_t lp_cnt = 0;
  for(;;) {

    MIDI_EventPacket_t ReceivedMIDIEvent;
    while(MIDI_Device_ReceiveEventPacket(&Keyboard_MIDI_Interface, &ReceivedMIDIEvent)) {
      led_on();
      printf("%02X %02X %02X\r\n", ReceivedMIDIEvent.Data1, ReceivedMIDIEvent.Data2, ReceivedMIDIEvent.Data3);
      led_off();
    }

    uint8_t state = KEY_PIN & (1<<KEY_BIT);
    if(state != last_state)
      lp_cnt++;
    else
      lp_cnt += lp_cnt ? -1 : 0;

    if(lp_cnt >= KEY_LP_MAX) {
      MIDI_EventPacket_t* MIDIEvent = state ? &MIDIEventOff : &MIDIEventOn;
      MIDI_Device_SendEventPacket(&Keyboard_MIDI_Interface, MIDIEvent);
      MIDI_Device_Flush(&Keyboard_MIDI_Interface);

      last_state = state;
      lp_cnt = 0;
    }

    MIDI_Device_USBTask(&Keyboard_MIDI_Interface);
    USB_USBTask();
  }
}