/************************************************************************************
 * configs/stm32f103minimum/src/stm32_tone.c
 *
 *   Copyright (C) 2016 Gregory Nutt. All rights reserved.
 *   Author: Alan Carvalho de Assis <acassis@gmail.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ************************************************************************************/

/************************************************************************************
 * Included Files
 ************************************************************************************/

#include <nuttx/config.h>

#include <errno.h>
#include <debug.h>

#include <nuttx/drivers/pwm.h>
#include <nuttx/timers/oneshot.h>
#include <nuttx/audio/tone.h>
#include <arch/board/board.h>

#include "chip.h"
#include "up_arch.h"
#include "stm32_pwm.h"
#include "stm32f103_minimum.h"

/************************************************************************************
 * Pre-processor Definitions
 ************************************************************************************/
/* Configuration ********************************************************************/

#define HAVE_TONE 1

/* TIMx used to generate PWM signal to Buzzer/Speaker */

#define TONE_PWM_TIMER 2

/* TIMx used to generate oneshot */

#define ONESHOT_TIMER 3

/* Oneshot timer resolution in microseconds */

#define OST_RES        10

#ifndef CONFIG_PWM
#  undef HAVE_TONE
#endif

#ifndef CONFIG_STM32_TIM2
#  undef HAVE_TONE
#endif

#ifndef CONFIG_STM32_TIM2_PWM
#  undef HAVE_TONE
#endif

#ifdef HAVE_TONE

/************************************************************************************
 * Public Functions
 ************************************************************************************/

/************************************************************************************
 * Name: stm32_tone_setup
 *
 * Description:
 *   Configure and initialize the tone generator.
 *
 ************************************************************************************/

int stm32_tone_setup(void)
{
  static bool                initialized = false;
  struct pwm_lowerhalf_s     *tone;
  struct pwm_info_s          info;
  struct oneshot_lowerhalf_s *oneshot = NULL;
  int                        ret;

  /* Have we already initialized? */

  if (!initialized)
    {
      /* Call stm32_pwminitialize() to get an instance of the PWM interface */

      tone = stm32_pwminitialize(TONE_PWM_TIMER);
      if (!tone)
        {
          auderr("Failed to get the STM32 PWM lower half to AUDIO TONE\n");
          return -ENODEV;
        }

      /* Initialize TONE PWM */

      tone->ops->setup(tone);
      tone->ops->start(tone, &info);

      /* Initialize ONESHOT Timer */

      oneshot = oneshot_initialize(ONESHOT_TIMER, OST_RES);
      if (!oneshot)
        {
          auderr("Failed to initialize ONESHOT Timer!\n");
          return -ENODEV;
        }

      /* Register the Audio Tone driver at "/dev/tone0" */

      ret = tone_register("/dev/tone0", tone, oneshot);
      if (ret < 0)
        {
          auderr("ERROR: tone_register failed: %d\n", ret);
          return ret;
        }

      /* Now we are initialized */

      initialized = true;
    }

  return OK;
}

#endif /* HAVE_TONE */