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/*
             LUFA Library
     Copyright (C) Dean Camera, 2017.

  dean [at] fourwalledcubicle [dot] com
           www.lufa-lib.org
*/

/*
  Copyright 2017  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, distribute, and sell this
  software and its documentation for any purpose is hereby granted
  without fee, provided that the above copyright notice appear in
  all copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting
  documentation, and that the name of the author not be used in
  advertising or publicity pertaining to distribution of the
  software without specific, written prior permission.

  The author disclaims all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \file
 *
 *  Header file for AudioInput.c.
 */

#ifndef _AUDIO_INPUT_H_
#define _AUDIO_INPUT_H_

	/* Includes: */
		#include <avr/io.h>
		#include <avr/wdt.h>
		#include <avr/power.h>
		#include <avr/interrupt.h>

		#include <LUFA/Drivers/Board/LEDs.h>
		#include <LUFA/Drivers/Board/Buttons.h>
		#include <LUFA/Drivers/Peripheral/ADC.h>
		#include <LUFA/Drivers/USB/USB.h>
		#include <LUFA/Platform/Platform.h>

		#include "Descriptors.h"
		#include "Config/AppConfig.h"

	/* Macros: */
		/** Maximum audio sample value for the microphone input. */
		#define SAMPLE_MAX_RANGE          0xFFFF

		/** Maximum ADC range for the microphone input. */
		#define ADC_MAX_RANGE             0x3FF

		/** LED mask for the library LED driver, to indicate that the USB interface is not ready. */
		#define LEDMASK_USB_NOTREADY      LEDS_LED1

		/** LED mask for the library LED driver, to indicate that the USB interface is enumerating. */
		#define LEDMASK_USB_ENUMERATING  (LEDS_LED2 | LEDS_LED3)

		/** LED mask for the library LED driver, to indicate that the USB interface is ready. */
		#define LEDMASK_USB_READY        (LEDS_LED2 | LEDS_LED4)

		/** LED mask for the library LED driver, to indicate that an error has occurred in the USB interface. */
		#define LEDMASK_USB_ERROR        (LEDS_LED1 | LEDS_LED3)

	/* Function Prototypes: */
		void SetupHardware(void);

		void EVENT_USB_Device_Connect(void);
		void EVENT_USB_Device_Disconnect(void);
		void EVENT_USB_Device_ConfigurationChanged(void);
		void EVENT_USB_Device_ControlRequest(void);

		bool CALLBACK_Audio_Device_GetSetEndpointProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
		                                                  const uint8_t EndpointProperty,
		                                                  const uint8_t EndpointAddress,
		                                                  const uint8_t EndpointControl,
		                                                  uint16_t* const DataLength,
		                                                  uint8_t* Data) ATTR_NON_NULL_PTR_ARG(1);
		bool CALLBACK_Audio_Device_GetSetInterfaceProperty(USB_ClassInfo_Audio_Device_t* const AudioInterfaceInfo,
		                                                   const uint8_t Property,
		                                                   const uint8_t EntityAddress,
		                                                   const uint16_t Parameter,
		                                                   uint16_t* const DataLength,
		                                                   uint8_t* Data);
#endif
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/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011,2012,2013 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT 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.

    ChibiOS/RT 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/>.
*/

/**
 * @file    chqueues.c
 * @brief   I/O Queues code.
 *
 * @addtogroup io_queues
 * @details ChibiOS/RT queues are mostly used in serial-like device drivers.
 *          The device drivers are usually designed to have a lower side
 *          (lower driver, it is usually an interrupt service routine) and an
 *          upper side (upper driver, accessed by the application threads).<br>
 *          There are several kind of queues:<br>
 *          - <b>Input queue</b>, unidirectional queue where the writer is the
 *            lower side and the reader is the upper side.
 *          - <b>Output queue</b>, unidirectional queue where the writer is the
 *            upper side and the reader is the lower side.
 *          - <b>Full duplex queue</b>, bidirectional queue. Full duplex queues
 *            are implemented by pairing an input queue and an output queue
 *            together.
 *          .
 * @pre     In order to use the I/O queues the @p CH_USE_QUEUES option must
 *          be enabled in @p chconf.h.
 * @{
 */

#include "ch.h"

#if CH_USE_QUEUES || defined(__DOXYGEN__)

/**
 * @brief   Puts the invoking thread into the queue's threads queue.
 *
 * @param[out] qp       pointer to an @p GenericQueue structure
 * @param[in] time      the number of ticks before the operation timeouts,
 *                      the following special values are allowed:
 *                      - @a TIME_IMMEDIATE immediate timeout.
 *                      - @a TIME_INFINITE no timeout.
 *                      .
 * @return              A message specifying how the invoking thread has been
 *                      released from threads queue.
 * @retval Q_OK         is the normal exit, thread signaled.
 * @retval Q_RESET      if the queue has been reset.
 * @retval Q_TIMEOUT    if the queue operation timed out.
 */
static msg_t qwait(GenericQueue *qp, systime_t time) {

  if (TIME_IMMEDIATE == time)
    return Q_TIMEOUT;
  currp->p_u.wtobjp = qp;
  queue_insert(currp, &qp->q_waiting);
  return chSchGoSleepTimeoutS(THD_STATE_WTQUEUE, time);
}

/**
 * @brief   Initializes an input queue.
 * @details A Semaphore is internally initialized and works as a counter of
 *          the bytes contained in the queue.
 * @note    The callback is invoked from within the S-Locked system state,
 *          see @ref system_states.
 *
 * @param[out] iqp      pointer to an @p InputQueue structure
 * @param[in] bp        pointer to a memory area allocated as queue buffer
 * @param[in] size      size of the queue buffer
 * @param[in] infy      pointer to a callback function that is invoked when
 *                      data is read from the queue. The value can be @p NULL.
 * @param[in] link      application defined pointer
 *
 * @init
 */
void chIQInit(InputQueue *iqp, uint8_t *bp, size_t size, qnotify_t infy,
              void *link) {

  queue_init(&iqp->q_waiting);
  iqp->q_counter = 0;
  iqp->q_buffer = iqp->q_rdptr = iqp->q_wrptr = bp;
  iqp->q_top = bp + size;
  iqp->q_notify = infy;
  iqp->q_link = link;
}

/**
 * @brief   Resets an input queue.
 * @details All the data in the input queue is erased and lost, any waiting
 *          thread is resumed with status @p Q_RESET.
 * @note    A reset operation can be used by a low level driver in order to
 *          obtain immediate attention from the high level layers.
 *
 * @param[in] iqp       pointer to an @p InputQueue structure
 *
 * @iclass
 */
void chIQResetI(InputQueue *iqp) {

  chDbgCheckClassI();

  iqp->q_rdptr = iqp->q_wrptr = iqp->q_buffer;
  iqp->q_counter = 0;
  while (notempty(&iqp->q_waiting))
    chSchReadyI(fifo_remove(&iqp->q_waiting))->p_u.rdymsg = Q_RESET;
}

/**
 * @brief   Input queue write.
 * @details A byte value is written into the low end of an input queue.
 *
 * @param[in] iqp       pointer to an @p InputQueue structure
 * @param[in] b         the byte value to be written in the queue
 * @return              The operation status.
 * @retval Q_OK         if the operation has been completed with success.
 * @retval Q_FULL       if the queue is full and the operation cannot be
 *                      completed.
 *
 * @iclass
 */
msg_t chIQPutI(InputQueue *iqp, uint8_t b) {

  chDbgCheckClassI();

  if (chIQIsFullI(iqp))
    return Q_FULL;

  iqp->q_counter++;
  *iqp->q_wrptr++ = b;
  if (iqp->q_wrptr >= iqp->q_top)
    iqp->q_wrptr = iqp->q_buffer;

  if (notempty(&iqp->q_waiting))
    chSchReadyI(fifo_remove(&iqp->q_waiting))->p_u.rdymsg = Q_OK;

  return Q_OK;
}

/**
 * @brief   Input queue read with timeout.
 * @details This function reads a byte value from an input queue. If the queue
 *          is empty then the calling thread is suspended until a byte arrives
 *          in the queue or a timeout occurs.
 * @note    The callback is invoked before reading the character from the
 *          buffer or before entering the state @p THD_STATE_WTQUEUE.
 *
 * @param[in] iqp       pointer to an @p InputQueue structure
 * @param[in] time      the number of ticks before the operation timeouts,
 *                      the following special values are allowed:
 *                      - @a TIME_IMMEDIATE immediate timeout.
 *                      - @a TIME_INFINITE no timeout.
 *                      .
 * @return              A byte value from the queue.
 * @retval Q_TIMEOUT    if the specified time expired.
 * @retval Q_RESET      if the queue has been reset.
 *
 * @api
 */
msg_t chIQGetTimeout(InputQueue *iqp, systime_t time) {
  uint8_t b;

  chSysLock();
  if (iqp->q_notify)
    iqp->q_notify(iqp);

  while (chIQIsEmptyI(iqp)) {
    msg_t msg;
    if ((msg = qwait((GenericQueue *)iqp, time)) < Q_OK) {
      chSysUnlock();
      return msg;
    }
  }

  iqp->q_counter--;
  b = *iqp->q_rdptr++;
  if (iqp->q_rdptr >= iqp->q_top)
    iqp->q_rdptr = iqp->q_buffer;

  chSysUnlock();
  return b;
}

/**
 * @brief   Input queue read with timeout.
 * @details The function reads data from an input queue into a buffer. The
 *          operation completes when the specified amount of data has been
 *          transferred or after the specified timeout or if the queue has
 *          been reset.
 * @note    The function is not atomic, if you need atomicity it is suggested
 *          to use a semaphore or a mutex for mutual exclusion.
 * @note    The callback is invoked before reading each character from the
 *          buffer or before entering the state @p THD_STATE_WTQUEUE.
 *
 * @param[in] iqp       pointer to an @p InputQueue structure
 * @param[out] bp       pointer to the data buffer
 * @param[in] n         the maximum amount of data to be transferred, the
 *                      value 0 is reserved
 * @param[in] time      the number of ticks before the operation timeouts,
 *                      the following special values are allowed:
 *                      - @a TIME_IMMEDIATE immediate timeout.
 *                      - @a TIME_INFINITE no timeout.
 *                      .
 * @return              The number of bytes effectively transferred.
 *
 * @api
 */
size_t chIQReadTimeout(InputQueue *iqp, uint8_t *bp,
                       size_t n, systime_t time) {
  qnotify_t nfy = iqp->q_notify;
  size_t r = 0;

  chDbgCheck(n > 0, "chIQReadTimeout");

  chSysLock();
  while (TRUE) {
    if (nfy)
      nfy(iqp);

    while (chIQIsEmptyI(iqp)) {
      if (qwait((GenericQueue *)iqp, time) != Q_OK) {
        chSysUnlock();
        return r;
      }
    }

    iqp->q_counter--;
    *bp++ = *iqp->q_rdptr++;
    if (iqp->q_rdptr >= iqp->q_top)
      iqp->q_rdptr = iqp->q_buffer;

    chSysUnlock(); /* Gives a preemption chance in a controlled point.*/
    r++;
    if (--n == 0)
      return r;

    chSysLock();
  }
}

/**
 * @brief   Initializes an output queue.
 * @details A Semaphore is internally initialized and works as a counter of
 *          the free bytes in the queue.
 * @note    The callback is invoked from within the S-Locked system state,
 *          see @ref system_states.
 *
 * @param[out] oqp      pointer to an @p OutputQueue structure
 * @param[in] bp        pointer to a memory area allocated as queue buffer
 * @param[in] size      size of the queue buffer
 * @param[in] onfy      pointer to a callback function that is invoked when
 *                      data is written to the queue. The value can be @p NULL.
 * @param[in] link      application defined pointer
 *
 * @init
 */
void chOQInit(OutputQueue *oqp, uint8_t *bp, size_t size, qnotify_t onfy,
              void *link) {

  queue_init(&oqp->q_waiting);
  oqp->q_counter = size;
  oqp->q_buffer = oqp->q_rdptr = oqp->q_wrptr = bp;
  oqp->q_top = bp + size;
  oqp->q_notify = onfy;
  oqp->q_link = link;
}

/**
 * @brief   Resets an output queue.
 * @details All the data in the output queue is erased and lost, any waiting
 *          thread is resumed with status @p Q_RESET.
 * @note    A reset operation can be used by a low level driver in order to
 *          obtain immediate attention from the high level layers.
 *
 * @param[in] oqp       pointer to an @p OutputQueue structure
 *
 * @iclass
 */
void chOQResetI(OutputQueue *oqp) {

  chDbgCheckClassI();

  oqp->q_rdptr = oqp->q_wrptr = oqp->q_buffer;
  oqp->q_counter = chQSizeI(oqp);
  while (notempty(&oqp->q_waiting))
    chSchReadyI(fifo_remove(&oqp->q_waiting))->p_u.rdymsg = Q_RESET;
}

/**
 * @brief   Output queue write with timeout.
 * @details This function writes a byte value to an output queue. If the queue
 *          is full then the calling thread is suspended until there is space
 *          in the queue or a timeout occurs.
 * @note    The callback is invoked after writing the character into the
 *          buffer.
 *
 * @param[in] oqp       pointer to an @p OutputQueue structure
 * @param[in] b         the byte value to be written in the queue
 * @param[in] time      the number of ticks before the operation timeouts,
 *                      the following special values are allowed:
 *                      - @a TIME_IMMEDIATE immediate timeout.
 *                      - @a TIME_INFINITE no timeout.
 *                      .
 * @return              The operation status.
 * @retval Q_OK         if the operation succeeded.
 * @retval Q_TIMEOUT    if the specified time expired.
 * @retval Q_RESET      if the queue has been reset.
 *
 * @api
 */
msg_t chOQPutTimeout(OutputQueue *oqp, uint8_t b, systime_t time) {

  chSysLock();
  while (chOQIsFullI(oqp)) {
    msg_t msg;

    if ((msg = qwait((GenericQueue *)oqp, time)) < Q_OK) {
      chSysUnlock();
      return msg;
    }
  }

  oqp->q_counter--;
  *oqp->q_wrptr++ = b;
  if (oqp->q_wrptr >= oqp->q_top)
    oqp->q_wrptr = oqp->q_buffer;

  if (oqp->q_notify)
    oqp->q_notify(oqp);

  chSysUnlock();
  return Q_OK;
}

/**
 * @brief   Output queue read.
 * @details A byte value is read from the low end of an output queue.
 *
 * @param[in] oqp       pointer to an @p OutputQueue structure
 * @return              The byte value from the queue.
 * @retval Q_EMPTY      if the queue is empty.
 *
 * @iclass
 */
msg_t chOQGetI(OutputQueue *oqp) {
  uint8_t b;

  chDbgCheckClassI();

  if (chOQIsEmptyI(oqp))
    return Q_EMPTY;

  oqp->q_counter++;
  b = *oqp->q_rdptr++;
  if (oqp->q_rdptr >= oqp->q_top)
    oqp->q_rdptr = oqp->q_buffer;

  if (notempty(&oqp->q_waiting))
    chSchReadyI(fifo_remove(&oqp->q_waiting))->p_u.rdymsg = Q_OK;

  return b;
}

/**
 * @brief   Output queue write with timeout.
 * @details The function writes data from a buffer to an output queue. The
 *          operation completes when the specified amount of data has been
 *          transferred or after the specified timeout or if the queue has
 *          been reset.
 * @note    The function is not atomic, if you need atomicity it is suggested
 *          to use a semaphore or a mutex for mutual exclusion.
 * @note    The callback is invoked after writing each character into the
 *          buffer.
 *
 * @param[in] oqp       pointer to an @p OutputQueue structure
 * @param[out] bp       pointer to the data buffer
 * @param[in] n         the maximum amount of data to be transferred, the
 *                      value 0 is reserved
 * @param[in] time      the number of ticks before the operation timeouts,
 *                      the following special values are allowed:
 *                      - @a TIME_IMMEDIATE immediate timeout.
 *                      - @a TIME_INFINITE no timeout.
 *                      .
 * @return              The number of bytes effectively transferred.
 *
 * @api
 */
size_t chOQWriteTimeout(OutputQueue *oqp, const uint8_t *bp,
                        size_t n, systime_t time) {
  qnotify_t nfy = oqp->q_notify;
  size_t w = 0;

  chDbgCheck(n > 0, "chOQWriteTimeout");

  chSysLock();
  while (TRUE) {
    while (chOQIsFullI(oqp)) {
      if (qwait((GenericQueue *)oqp, time) != Q_OK) {
        chSysUnlock();
        return w;
      }
    }
    oqp->q_counter--;
    *oqp->q_wrptr++ = *bp++;
    if (oqp->q_wrptr >= oqp->q_top)
      oqp->q_wrptr = oqp->q_buffer;

    if (nfy)
      nfy(oqp);

    chSysUnlock(); /* Gives a preemption chance in a controlled point.*/
    w++;
    if (--n == 0)
      return w;
    chSysLock();
  }
}
#endif  /* CH_USE_QUEUES */

/** @} */