ESP32 Industrial Noise Monitor with Touch Screen

// Main task to update values on the display at 10 fps
static void dbm_task(void *arg)
{
    dbm_flex dbm;

    // Chart buffers and series
    lv_chart_series_t *ser_sec, *ser_min, *ser_hrs;
    uint8_t chart_sec_data[60], chart_min_data[60], chart_hrs_data[12];
    lv_coord_t lvchart_sec_data[60], lvchart_min_data[60], lvchart_hrs_data[12];

    // Get dbm module details
    esp_err_t err = dbmeter_get_version_id (I2C_MASTER_NUM, &dbm);
    if (err != ESP_OK)
    {
        ESP_LOGW (TAG, "dbm_flex not connected, connect module and restart");
        while (1)
            vTaskDelay (10);
    }
    else
    {
        ESP_LOGW (TAG, "dbm_flex version is 0x%02X", dbm.version);
    }

    example_lvgl_lock(-1);
    ser_sec = lv_chart_get_series_next (ui_ChartSec, NULL);
    ser_min = lv_chart_get_series_next (ui_ChartMin, NULL);
    ser_hrs = lv_chart_get_series_next (ui_ChartHour, NULL);
    
    // Set ID and version text
    char id_str[64];
    sprintf (id_str, "Rev: %02X, UID: %08X", dbm.version, (unsigned int)dbm.id);
    lv_label_set_text(ui_LabelUID, id_str);

    // Add button callbacks
    lv_obj_add_event_cb (ui_ButtonClrPeak, ui_ButtonClrPeak_click_cb, LV_EVENT_CLICKED, NULL);
    lv_obj_add_event_cb (ui_ButtonClrHistory, ui_ButtonClrHistory_click_cb, LV_EVENT_CLICKED, NULL);
    example_lvgl_unlock();

    // Clear the sensor min/max/peak to remove "pop" effects of power-up
    dbmeter_clear_data (I2C_MASTER_NUM, DBM_CLR_MAXMIN|DBM_CLR_HISTORY|DBM_CLR_OVERUNDER|DBM_CLR_LPK);

    // Run this loop every 100 ms (display readings are refreshed 10 times/sec)
    while (1)
    {
        // Update decibel data structure with parameters needed for this demo
        dbmeter_update_params (I2C_MASTER_NUM, &dbm,
            DBM_PARAM_DB | DBM_PARAM_LPK | DBM_PARAM_LMAXMIN | DBM_PARAM_TSTATS);

        // Fetch seconds history
        dbmeter_read_history_sec (I2C_MASTER_NUM, chart_sec_data);
        for (uint8_t i=0; i<60; i++)
            lvchart_sec_data[i] = chart_sec_data[i];

        // Fetch minutes history
        dbmeter_read_history_min (I2C_MASTER_NUM, chart_min_data);
        for (uint8_t i=0; i<60; i++)
            lvchart_min_data[i] = chart_min_data[i];

        // Fetch hours history
        dbmeter_read_history_hrs (I2C_MASTER_NUM, chart_hrs_data);
        for (uint8_t i=0; i<12; i++)
            lvchart_hrs_data[i] = chart_hrs_data[i];

        // Update T over value
        char tover_str[64];
        sprintf(tover_str, "%d", (unsigned int)dbm.seconds_over);

        // Refresh parameters with new values for the screen
        example_lvgl_lock(-1);

        // Update dBA,slow value
        lv_bar_set_value(ui_BardBA, dbm.dBA, LV_ANIM_ON);
        char dbval_str[16];
        sprintf(dbval_str, "%2.1f dB SPL", dbm.dBA);
        lv_label_set_text(ui_LabeldBA, dbval_str);

        // Update min, max and peak markers under the dBA bar
        // X axis for markers is -147 + 5* val
        // LAmax is ^ in red
        lv_obj_set_x(ui_LabelLAmax, -147 + 5*(dbm.LAmax-30));
        // LAmin is ^ in green
        lv_obj_set_x(ui_LabelLAmin, -147 + 5*(dbm.LAmin-30));
        // LCpeak is | in white
        lv_obj_set_x(ui_LabelLCpeak, -147 + 5*(dbm.LCpk-30));

        // Update time-over seconds count
        lv_label_set_text(ui_LabelTover, tover_str);

        // Update seconds chart
        lv_chart_set_ext_y_array(ui_ChartSec, ser_sec, lvchart_sec_data);
        lv_chart_refresh (ui_ChartSec);

        // Update minutes chart
        lv_chart_set_ext_y_array(ui_ChartMin, ser_min, lvchart_min_data);
        lv_chart_refresh (ui_ChartMin);

        // Update hour chart
        lv_chart_set_ext_y_array(ui_ChartHour, ser_hrs, lvchart_hrs_data);
        lv_chart_refresh (ui_ChartHour);
        example_lvgl_unlock();

        // Wait for 100 ms before looping again
        vTaskDelay (100/portTICK_PERIOD_MS);
    }
}