speaker_control.c

/***
 * Noptel LRF rangefinder sampler for the Flipper Zero
 * Version: 2.0
 *
 * Speaker control
***/

/*** Includes ***/
#include <furi_hal.h>

#include "common.h"



/*** Routines ***/

/** Speaker control timer callback **/
static void speaker_control_timer_callback(void *ctx) {

  SpeakerControl *spc = (SpeakerControl *)ctx;

  /* Should we start beeping? */
  if(spc->play_beep) {

    /* Start the speaker beeping if it wasn't beeping already */
    if(!spc->beep_playing && furi_hal_speaker_acquire(500)) {
      furi_hal_speaker_start(beep_frequency, 1);
      spc->beep_playing = true;
    }

    spc->play_beep = false;

    /* Reschedule ourselves in one beep duration */
    furi_timer_start(spc->speaker_control_timer, spc->beep_duration);
  }

  /* If the speaker is beeping, stop it and don't reschedule ourselves */
  else
    if(spc->beep_playing && furi_hal_speaker_is_mine()) {
      furi_hal_speaker_stop();
      furi_hal_speaker_release();
      spc->beep_playing = false;
  }
}



/** Setup the speaker control **/
void set_speaker_control(SpeakerControl *spc) {

  /* No beep is currently playing */
  spc->play_beep = false;
  spc->beep_playing = false;
  spc->beep_duration = 0;

  /* Setup the timer to control the speaker */
  spc->speaker_control_timer = furi_timer_alloc(speaker_control_timer_callback,
						FuriTimerTypeOnce, spc);
}



/** Release the speaker control **/
void release_speaker_control(SpeakerControl *spc) {

  /* Make sure the speaker has stopped beeping */
  spc->play_beep = false;
  if(spc->beep_duration)
    furi_delay_ms(spc->beep_duration * 2);

  /* Stop and free the speaker control timer callback */
  furi_timer_stop(spc->speaker_control_timer);
  furi_timer_free(spc->speaker_control_timer);
}



/** Start a beep **/
void start_beep(SpeakerControl *spc, uint16_t duration) {

  /* Store how long this beep should last */
  spc->beep_duration = duration;

  /* Raise the flag for the speaker control timer callback to start a beep */
  spc->play_beep = true;

  /* Schedule the speaker control timer control to run asap */
  furi_timer_start(spc->speaker_control_timer, 1);
}