snapclient/components/esp_peripherals/periph_touch.c

/*
 * ESPRESSIF MIT License
 *
 * Copyright (c) 2018 <ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD>
 *
 * Permission is hereby granted for use on all ESPRESSIF SYSTEMS products, in
 * which case, it is free of charge, to any person obtaining a copy of this
 * software and associated documentation files (the "Software"), to deal in the
 * Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 */

#include "periph_touch.h"
#include "audio_mem.h"
#include "esp_log.h"
#include "esp_peripherals.h"
#include "touch.h"

static const char *TAG = "PERIPH_TOUCH";

#define VALIDATE_TOUCH(periph, ret)                                           \
  if (!(periph && esp_periph_get_id (periph) == PERIPH_ID_TOUCH))             \
    {                                                                         \
      ESP_LOGE (TAG, "Invalid TOUCH periph, at line %d", __LINE__);           \
      return ret;                                                             \
    }

typedef struct periph_touch
{
  esp_touch_handle_t touch;
  int touch_mask;
  int long_tap_time_ms;
  int tap_threshold_percent;
  touch_result_t result;
} periph_touch_t;

static void
touch_send_event (esp_periph_handle_t self, int event_id, int mask)
{
  int touch_num = 0;
  while (mask)
    {
      if (mask & 0x01)
        {
          esp_periph_send_event (self, event_id, (void *)touch_num, 0);
        }
      mask >>= 1;
      touch_num++;
    }
}

static esp_err_t
_touch_run (esp_periph_handle_t self, audio_event_iface_msg_t *msg)
{
  periph_touch_t *periph_touch = esp_periph_get_data (self);
  touch_send_event (self, PERIPH_TOUCH_TAP, periph_touch->result.tap_mask);
  touch_send_event (self, PERIPH_TOUCH_RELEASE,
                    periph_touch->result.release_mask);
  touch_send_event (self, PERIPH_TOUCH_LONG_TAP,
                    periph_touch->result.long_tap_mask);
  touch_send_event (self, PERIPH_TOUCH_LONG_RELEASE,
                    periph_touch->result.long_release_mask);
  return ESP_OK;
}

static void
touch_timer_handler (xTimerHandle tmr)
{
  esp_periph_handle_t periph = (esp_periph_handle_t)pvTimerGetTimerID (tmr);

  periph_touch_t *periph_touch = esp_periph_get_data (periph);
  if (esp_touch_read (periph_touch->touch, &periph_touch->result))
    {
      ESP_LOGD (TAG,
                "Touch event, tap %x, release_mask: %x, long_tap_mask: %x, "
                "long_tap_mask: %x",
                periph_touch->result.tap_mask,
                periph_touch->result.release_mask,
                periph_touch->result.long_tap_mask,
                periph_touch->result.long_release_mask);
      esp_periph_send_cmd (periph, 0, NULL, 0);
    }
}

static esp_err_t
_touch_init (esp_periph_handle_t self)
{
  VALIDATE_TOUCH (self, ESP_FAIL);
  periph_touch_t *periph_touch = esp_periph_get_data (self);

  touch_config_t touch_config = {
    .touch_mask = periph_touch->touch_mask,
    .long_tap_time_ms = periph_touch->long_tap_time_ms,
    .tap_threshold_percent = periph_touch->tap_threshold_percent,
  };
  periph_touch->touch = esp_touch_init (&touch_config);

  esp_periph_start_timer (self, 150 / portTICK_PERIOD_MS, touch_timer_handler);
  ESP_LOGW (TAG, "_touch_init");
  return ESP_OK;
}

static esp_err_t
_touch_destroy (esp_periph_handle_t self)
{
  periph_touch_t *periph_touch = esp_periph_get_data (self);
  esp_touch_destroy (periph_touch->touch);
  audio_free (periph_touch);
  return ESP_OK;
}

esp_periph_handle_t
periph_touch_init (periph_touch_cfg_t *config)
{
  esp_periph_handle_t periph
      = esp_periph_create (PERIPH_ID_TOUCH, "periph_touch");
  AUDIO_MEM_CHECK (TAG, periph, return NULL);
  periph_touch_t *periph_touch = audio_calloc (1, sizeof (periph_touch_t));
  AUDIO_MEM_CHECK (TAG, periph_touch, {
    audio_free (periph);
    return NULL;
  });
  periph_touch->touch_mask = config->touch_mask;
  periph_touch->long_tap_time_ms = config->long_tap_time_ms;
  periph_touch->tap_threshold_percent = config->tap_threshold_percent;

  esp_periph_set_data (periph, periph_touch);
  esp_periph_set_function (periph, _touch_init, _touch_run, _touch_destroy);

  return periph;
}