/*
  DigitalInputFirmata.cpp - Firmata library
  Copyright (C) 2006-2008 Hans-Christoph Steiner.  All rights reserved.
  Copyright (C) 2010-2011 Paul Stoffregen.  All rights reserved.
  Copyright (C) 2009 Shigeru Kobayashi.  All rights reserved.
  Copyright (C) 2013 Norbert Truchsess. All rights reserved.
  Copyright (C) 2009-2015 Jeff Hoefs.  All rights reserved.

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  See file LICENSE.txt for further informations on licensing terms.

  Last updated by Jeff Hoefs: November 15th, 2015
*/

#include <ConfigurableFirmata.h>
#include "DigitalInputFirmata.h"

DigitalInputFirmata *DigitalInputFirmataInstance;

void reportDigitalInputCallback(byte port, int value)
{
  DigitalInputFirmataInstance->reportDigital(port, value);
}

DigitalInputFirmata::DigitalInputFirmata()
{
  DigitalInputFirmataInstance = this;
  Firmata.attach(REPORT_DIGITAL, reportDigitalInputCallback);
}

boolean DigitalInputFirmata::handleSysex(byte command, byte argc, byte* argv)
{
  return false;
}

void DigitalInputFirmata::outputPort(byte portNumber, byte portValue, byte forceSend)
{
  // pins not configured as INPUT are cleared to zeros
  portValue = portValue & portConfigInputs[portNumber];
  // only send if the value is different than previously sent
  if (forceSend || previousPINs[portNumber] != portValue) {
    Firmata.sendDigitalPort(portNumber, portValue);
    previousPINs[portNumber] = portValue;
  }
}

/* -----------------------------------------------------------------------------
 * check all the active digital inputs for change of state, then add any events
 * to the Serial output queue using Serial.print() */
void DigitalInputFirmata::report(void)
{
  /* Using non-looping code allows constants to be given to readPort().
   * The compiler will apply substantial optimizations if the inputs
   * to readPort() are compile-time constants. */
  if (TOTAL_PORTS > 0 && reportPINs[0]) outputPort(0, readPort(0, portConfigInputs[0]), false);
  if (TOTAL_PORTS > 1 && reportPINs[1]) outputPort(1, readPort(1, portConfigInputs[1]), false);
  if (TOTAL_PORTS > 2 && reportPINs[2]) outputPort(2, readPort(2, portConfigInputs[2]), false);
  if (TOTAL_PORTS > 3 && reportPINs[3]) outputPort(3, readPort(3, portConfigInputs[3]), false);
  if (TOTAL_PORTS > 4 && reportPINs[4]) outputPort(4, readPort(4, portConfigInputs[4]), false);
  if (TOTAL_PORTS > 5 && reportPINs[5]) outputPort(5, readPort(5, portConfigInputs[5]), false);
  if (TOTAL_PORTS > 6 && reportPINs[6]) outputPort(6, readPort(6, portConfigInputs[6]), false);
  if (TOTAL_PORTS > 7 && reportPINs[7]) outputPort(7, readPort(7, portConfigInputs[7]), false);
  if (TOTAL_PORTS > 8 && reportPINs[8]) outputPort(8, readPort(8, portConfigInputs[8]), false);
  if (TOTAL_PORTS > 9 && reportPINs[9]) outputPort(9, readPort(9, portConfigInputs[9]), false);
  if (TOTAL_PORTS > 10 && reportPINs[10]) outputPort(10, readPort(10, portConfigInputs[10]), false);
  if (TOTAL_PORTS > 11 && reportPINs[11]) outputPort(11, readPort(11, portConfigInputs[11]), false);
  if (TOTAL_PORTS > 12 && reportPINs[12]) outputPort(12, readPort(12, portConfigInputs[12]), false);
  if (TOTAL_PORTS > 13 && reportPINs[13]) outputPort(13, readPort(13, portConfigInputs[13]), false);
  if (TOTAL_PORTS > 14 && reportPINs[14]) outputPort(14, readPort(14, portConfigInputs[14]), false);
  if (TOTAL_PORTS > 15 && reportPINs[15]) outputPort(15, readPort(15, portConfigInputs[15]), false);
}

void DigitalInputFirmata::reportDigital(byte port, int value)
{
  if (port < TOTAL_PORTS) {
    reportPINs[port] = (byte)value;
    if (value) outputPort(port, readPort(port, portConfigInputs[port]), true);
  }
  // do not disable analog reporting on these 8 pins, to allow some
  // pins used for digital, others analog.  Instead, allow both types
  // of reporting to be enabled, but check if the pin is configured
  // as analog when sampling the analog inputs.  Likewise, while
  // scanning digital pins, portConfigInputs will mask off values from any
  // pins configured as analog
}

boolean DigitalInputFirmata::handlePinMode(byte pin, int mode)
{
  if (IS_PIN_DIGITAL(pin)) {
    if (mode == INPUT || mode == PIN_MODE_PULLUP) {
      portConfigInputs[pin / 8] |= (1 << (pin & 7));
      if (mode == INPUT) {
        pinMode(PIN_TO_DIGITAL(pin), INPUT);
      } else {
        pinMode(PIN_TO_DIGITAL(pin), INPUT_PULLUP);
        Firmata.setPinState(pin, 1);
      }
      return true;
    } else {
      portConfigInputs[pin / 8] &= ~(1 << (pin & 7));
    }
  }
  return false;
}

void DigitalInputFirmata::handleCapability(byte pin)
{
  if (IS_PIN_DIGITAL(pin)) {
    Firmata.write((byte)INPUT);
    Firmata.write(1);
    Firmata.write((byte)PIN_MODE_PULLUP);
    Firmata.write(1);
  }
}

void DigitalInputFirmata::reset()
{
  for (byte i = 0; i < TOTAL_PORTS; i++) {
    reportPINs[i] = false;      // by default, reporting off
    portConfigInputs[i] = 0;    // until activated
    previousPINs[i] = 0;
  }
}