FridgeSensor/main/sound.c

#include "sound.h"
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
//#include "driver/gpio.h"
#include "esp_log.h"
#include "sdkconfig.h"
#include "driver/dac.h"
#include "math.h"

#define DAC_CHANNEL       1
#define DAC_PIN           GPIO_NUM_25   // GPIO pin for DAC output GPIO25=Channel 1
#define TONE_FREQ         440           // Frequency of the tone in Hz
#define TONE_DURATION     1000          // Duration of the tone in ms
#define QUIET_DURATION    1000          // Duration of the quiet period in ms

bool soundEnabled = false;

static void play_tone(int frequency, float duration, int quietDuration) {

    int semitones = 0;

    int t_freq = frequency * pow(2.0, semitones / 12.0);

    int8_t cw_offset = 0;
    dac_cw_config_t cosineConf = {DAC_CHANNEL_1, DAC_CW_SCALE_8, DAC_CW_PHASE_0, t_freq, cw_offset};

    if (frequency == 0) {
        dac_output_disable(DAC_CHANNEL_1);
    } else {
        dac_cw_generator_config(&cosineConf);
        dac_output_enable(DAC_CHANNEL_1);
    }

    // Loop with 50mS loops until the duration is complete
    for(int i = 0; i < duration; i+=50) {
        vTaskDelay(pdMS_TO_TICKS(50));
        if( soundEnabled == false ) {
            break;
        }
    }
    dac_output_disable(DAC_CHANNEL_1);
}

static void setupSound() {

    int8_t cw_offset = 0;
    dac_cw_config_t cosineConf = {DAC_CHANNEL_1, DAC_CW_SCALE_8, DAC_CW_PHASE_0, 440, cw_offset};

    dac_output_disable(DAC_CHANNEL_1);
    dac_cw_generator_config(&cosineConf);
    dac_cw_generator_enable();
    dac_output_disable(DAC_CHANNEL_1);

    ESP_LOGI("SOUND", "Sound setup");
}

static void sound_task(void *pvParameters) {

    ESP_LOGI("SOUND", "Sound task starts....");

    setupSound();

    while (1) {
        vTaskDelay(pdMS_TO_TICKS(1000));
        if( soundEnabled ) {
            play_tone(TONE_FREQ, TONE_DURATION, QUIET_DURATION);
        }
    }
}

void initSound() {

    xTaskCreate(sound_task, "sound_task", 2048, NULL, 10, NULL);
    ESP_LOGI("SOUND", "Sound initialized");
}

void enableNotificationSound(bool enable)
{
    if (soundEnabled != enable) {
        ESP_LOGI("SOUND", "Notification sound %s", enable ? "enabled" : "disabled");
    }
    soundEnabled = enable;
}