Mercurial > iotbalkon / file revision

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2020 Julian Doerner <https://github.com/juliandoerner>
 *
 * Permission is hereby granted, 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.
 */

/**
 * @file tsl2591.c
 *
 * ESP-IDF driver for TSL2591 light-to-digital.
 *
 * Copyright (c) 2020 Julian Doerner <https://github.com/juliandoerner>
 *
 * MIT Licensed as described in the file LICENSE
 */

#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <esp_log.h>
#include <esp_idf_lib_helpers.h>
#include "tsl2591.h"

#define I2C_FREQ_HZ 400000 // 400kHz

static const char *TAG = "tsl2591";

// Registers
#define TSL2591_REG_COMMAND 0x80
#define TSL2591_REG_ENABLE  0x00
#define TSL2591_REG_CONTROL 0x01
#define TSL2591_REG_AILTL   0x04    // ALS interrupt low threshold low byte
#define TSL2591_REG_AILTH   0x05    // ALS interrupt low threshold high byte
#define TSL2591_REG_AIHTL   0x06    // ALS interrupt high threshold low byte
#define TSL2591_REG_AIHTH   0x07    // ALS interrupt high threshold high byte
#define TSL2591_REG_NPAILTL 0x08    // No ALS persist interrupt low threshold low byte
#define TSL2591_REG_NPAILTH 0x09    // No ALS persist interrupt low threshold high byte
#define TSL2591_REG_NPAIHTL 0x0A    // No ALS persist interrupt high threshold low byte
#define TSL2591_REG_NPAIHTH 0x0B    // No ALS persist interrupt high threshold high byte
#define TSL2591_REG_PERSIST 0x0C    // Interrupt persistence filter
#define TSL2591_REG_C0DATAL 0x14
#define TSL2591_REG_C0DATAH 0x15
#define TSL2591_REG_C1DATAL 0x16
#define TSL2591_REG_C1DATAH 0x17
#define TSL2591_REG_STATUS  0x13

// TSL2591 command register transaction mode.
#define TSL2591_TRANSACTION_NORMAL  0x20    // Normal transaction for addressing registers
#define TSL2591_TRANSACTION_SPECIAL 0x60    // Special transactions for interrupt clearing

// TSL2591 command register special functions.
#define TSL2591_SPECIAL_SET_INTR        0x04    // Forces interrupt
#define TSL2591_SPECIAL_CLEAR_INTR      0x06    // Clear ALS interrupt
#define TSL2591_SPECIAL_CLEAR_BOTH      0x07    // Clear ALS and no persist ALS interrupt
#define TSL2591_SPECIAL_CLEAR_NP_INTR   0x0A    // Clear no persist ALS interrupt

// TSL2591 integration times in useconds.
#define TSL2591_INTEGRATION_TIME_100MS  110
#define TSL2591_INTEGRATION_TIME_200MS  210
#define TSL2591_INTEGRATION_TIME_300MS  310
#define TSL2591_INTEGRATION_TIME_400MS  410
#define TSL2591_INTEGRATION_TIME_500MS  510
#define TSL2591_INTEGRATION_TIME_600MS  610

// TSL2591 status flags.
#define TSL2591_STATUS_ALS_INTR     0x10
#define TSL2591_STATUS_ALS_NP_INTR  0x20
#define TSL2591_STATUS_ALS_VALID    0x01  

// Calculation constants.
#define TSL2591_LUX_DF 408.0F

#define CHECK(x) do { esp_err_t __; if ((__ = x) != ESP_OK) return __; } while (0)
#define CHECK_ARG(VAL) do { if (!(VAL)) return ESP_ERR_INVALID_ARG; } while (0)
#define SLEEP_MS(x) do { vTaskDelay(pdMS_TO_TICKS(x)); } while (0)

// Read/write to registers.
static inline esp_err_t write_register(tsl2591_t *dev, uint8_t reg, uint8_t value)
{
    ESP_LOGD(TAG, "Writing register: 0x%x; Data: 0x%x.", reg, value);
    return i2c_dev_write_reg(&dev->i2c_dev, 
        TSL2591_REG_COMMAND | TSL2591_TRANSACTION_NORMAL | reg, &value, 1);
}

static inline esp_err_t read_register(tsl2591_t *dev, uint8_t reg, uint8_t *value)
{
    esp_err_t err;
    err = i2c_dev_read_reg(&dev->i2c_dev, 
        TSL2591_REG_COMMAND | TSL2591_TRANSACTION_NORMAL | reg, value, 1);
    ESP_LOGD(TAG, "Red register: 0x%x; Data: 0x%x.", reg, *value);
    return err;
}

// Write special function to command register.
static inline esp_err_t write_special_function(tsl2591_t *dev, uint8_t special_function)
{
    uint8_t function = TSL2591_REG_COMMAND | TSL2591_TRANSACTION_SPECIAL | special_function;
    ESP_LOGD(TAG, "Calling special function: 0x%x with 0x%x.", special_function, function);
    return i2c_dev_write(&dev->i2c_dev, NULL, 0, &function, 8);
}

// Read/write enable register.
static inline esp_err_t write_enable_register(tsl2591_t *dev, uint8_t value)
{
    return write_register(dev, TSL2591_REG_ENABLE, value);
}

static inline esp_err_t read_enable_register(tsl2591_t *dev, uint8_t *value)
{
    return read_register(dev, TSL2591_REG_ENABLE, value);
}

// Read/write control register.
static inline esp_err_t write_control_register(tsl2591_t *dev, uint8_t value)
{
    return write_register(dev, TSL2591_REG_CONTROL, value);
}

static inline esp_err_t read_control_register(tsl2591_t *dev, uint8_t *value)
{
    return read_register(dev, TSL2591_REG_CONTROL, value);
}

// Read 16 bit from two consecutive registers.
// Note that the sensor will shadow for example C0DATAH if C0DATAL is read. 
static inline esp_err_t read_register16(tsl2591_t *dev, uint8_t low_register, uint16_t *value)
{
    uint8_t buf[2];
    CHECK(i2c_dev_read_reg(&dev->i2c_dev, 
        TSL2591_REG_COMMAND | TSL2591_TRANSACTION_NORMAL | low_register, buf, 2));
    *value = (uint16_t)buf[1] << 8 | buf[0];

    return ESP_OK;

}


// Initialization.
esp_err_t tsl2591_init_desc(tsl2591_t *dev, i2c_port_t port, gpio_num_t sda_gpio, gpio_num_t scl_gpio)
{
    CHECK_ARG(dev);
    ESP_LOGD(TAG, "Initialize descriptor");

    dev->i2c_dev.port = port;
    dev->i2c_dev.addr = TSL2591_I2C_ADDR; // tsl2591 has only one i2c address.
    dev->i2c_dev.cfg.sda_io_num = sda_gpio;
    dev->i2c_dev.cfg.scl_io_num = scl_gpio;
#if HELPER_TARGET_IS_ESP32
    dev->i2c_dev.cfg.master.clk_speed = I2C_FREQ_HZ;
#endif

    return i2c_dev_create_mutex(&dev->i2c_dev);
}

esp_err_t tsl2591_free_desc(tsl2591_t *dev)
{
    CHECK_ARG(dev);
    ESP_LOGD(TAG, "Free descriptor.");

    return i2c_dev_delete_mutex(&dev->i2c_dev);
}

esp_err_t tsl2591_init(tsl2591_t *dev)
{
    CHECK_ARG(dev);
    ESP_LOGD(TAG, "Initialize sensor.");

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    uint8_t tmp_reg = 0;
    I2C_DEV_CHECK(&dev->i2c_dev, read_enable_register(dev, &tmp_reg));
    dev->settings.enable_reg = tmp_reg;
    ESP_LOGD(TAG, "Initial enable register: %x.", tmp_reg);

    I2C_DEV_CHECK(&dev->i2c_dev, read_control_register(dev, &tmp_reg));
    dev->settings.control_reg = tmp_reg;
    ESP_LOGD(TAG, "Initial control register: %x.", tmp_reg);

    I2C_DEV_CHECK(&dev->i2c_dev, read_register(dev, TSL2591_REG_PERSIST, &tmp_reg));
    dev->settings.persistence_reg = tmp_reg;
    ESP_LOGD(TAG, "Initial persistence filter: %x.", tmp_reg);

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    // Wait until the first integration cycle is completed.
    tsl2591_integration_time_t integration_time;
    ESP_ERROR_CHECK(tsl2591_get_integration_time(dev, &integration_time));
    switch (integration_time)
    {
    case TSL2591_INTEGRATION_100MS:
        SLEEP_MS(110);
        break;
    case TSL2591_INTEGRATION_200MS:
        SLEEP_MS(210);
        break;
    case TSL2591_INTEGRATION_300MS:
        SLEEP_MS(310);
        break;
    case TSL2591_INTEGRATION_400MS:
        SLEEP_MS(410);
        break;
    case TSL2591_INTEGRATION_500MS:
        SLEEP_MS(510);
        break;
    case TSL2591_INTEGRATION_600MS:
        SLEEP_MS(610);
        break;
    }

    return ESP_OK;
}


// Measure.
esp_err_t tsl2591_get_channel_data(tsl2591_t *dev, uint16_t *channel0, uint16_t *channel1)
{
    CHECK_ARG(dev && channel0 &&  channel1);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev, read_register16(dev, TSL2591_REG_C0DATAL, channel0));
    I2C_DEV_CHECK(&dev->i2c_dev, read_register16(dev, TSL2591_REG_C1DATAL, channel1));
    
    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);
    ESP_LOGD(TAG, "channel0: 0x%x channel1: 0x%x.", *channel0, *channel1);

    return ESP_OK;
}

esp_err_t tsl2591_calculate_lux(tsl2591_t *dev, uint16_t channel0, uint16_t channel1, float *lux)
{
    CHECK_ARG(dev && lux);

    float atime, again;
    switch (dev->settings.control_reg & 0x07)
    {
    case TSL2591_INTEGRATION_100MS:
        atime = 100;
        break;
    case TSL2591_INTEGRATION_200MS:
        atime = 200;
        break;
    case TSL2591_INTEGRATION_300MS:
        atime = 300;
        break;
    case TSL2591_INTEGRATION_400MS:
        atime = 400;
        break;
    case TSL2591_INTEGRATION_500MS:
        atime = 500;
        break;
    case TSL2591_INTEGRATION_600MS:
        atime = 600;
        break;
    default:
        atime = 100;
    }

    switch (dev->settings.control_reg & TSL2591_GAIN_MAX)
    {
    case TSL2591_GAIN_LOW:
        again = 1;
        break;
    case TSL2591_GAIN_MEDIUM:
        again = 25;
        break;
    case TSL2591_GAIN_HIGH:
        again = 428;
        break;
    case TSL2591_GAIN_MAX:
        again = 9876;
        break;
    default:
        again = 1;
    }

    // See Adafruit Arduino driver.
    float cpl = (atime * again) / TSL2591_LUX_DF;
    *lux = (((float)channel0 - (float)channel1)) * 
        (1.0F - ((float)channel1 / (float)channel0)) / cpl;

    return ESP_OK;
}

esp_err_t tsl2591_get_lux(tsl2591_t *dev, float *lux)
{
    CHECK_ARG(dev && lux);

    uint16_t channel0, channel1;
    CHECK(tsl2591_get_channel_data(dev, &channel0, &channel1));
    
    return tsl2591_calculate_lux(dev, channel0, channel1, lux);
}

// Setters and getters enable register.
esp_err_t tsl2591_set_power_status(tsl2591_t *dev, tsl2591_power_status_t power_status)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev, 
        write_enable_register(dev, (dev->settings.enable_reg & ~TSL2591_POWER_ON) | power_status));
    dev->settings.enable_reg = (dev->settings.enable_reg & ~TSL2591_POWER_ON) | power_status;

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_get_power_status(tsl2591_t *dev, tsl2591_power_status_t *power_status)
{
    CHECK_ARG(dev && power_status);

    *power_status = dev->settings.enable_reg & TSL2591_POWER_ON;

    return ESP_OK;
}

esp_err_t tsl2591_set_als_status(tsl2591_t *dev, tsl2591_als_status_t als_status)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev, 
        write_enable_register(dev, (dev->settings.enable_reg & ~TSL2591_ALS_ON) | als_status));
    dev->settings.enable_reg = (dev->settings.enable_reg & ~TSL2591_ALS_ON) | als_status;

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_get_als_status(tsl2591_t *dev, tsl2591_als_status_t *als_status)
{
    CHECK_ARG(dev && als_status);

    *als_status = dev->settings.enable_reg & TSL2591_ALS_ON;

    return ESP_OK;
}

esp_err_t tsl2591_set_interrupt(tsl2591_t *dev, tsl2591_interrupt_t interrupt)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev,
        write_enable_register(dev, (dev->settings.enable_reg & ~TSL2591_ALS_INTR_BOTH_ON) | interrupt));
    dev->settings.enable_reg = (dev->settings.enable_reg & ~TSL2591_ALS_INTR_BOTH_ON) | interrupt; 

    uint8_t tmp = 0;
    I2C_DEV_CHECK(&dev->i2c_dev,
        read_enable_register(dev, &tmp));

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_get_interrupt(tsl2591_t *dev, tsl2591_interrupt_t *interrupt)
{
    CHECK_ARG(dev && interrupt);

    *interrupt = dev->settings.enable_reg & TSL2591_ALS_INTR_BOTH_ON;

    return ESP_OK;
}

esp_err_t tsl2591_set_sleep_after_intr(tsl2591_t *dev, tsl2591_sleep_after_intr_t sleep_after_intr)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev,
        write_enable_register(dev, (dev->settings.enable_reg & ~TSL2591_SLEEP_AFTER_ON) | sleep_after_intr));
    dev->settings.enable_reg = (dev->settings.enable_reg & ~TSL2591_SLEEP_AFTER_ON) | sleep_after_intr; 

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_get_sleep_after_intr(tsl2591_t *dev, tsl2591_sleep_after_intr_t *sleep_after_intr)
{
    CHECK_ARG(dev && sleep_after_intr);

    *sleep_after_intr = dev->settings.enable_reg & TSL2591_SLEEP_AFTER_ON;

    return ESP_OK;
}


// Setters and getters control register.
esp_err_t tsl2591_set_integration_time(tsl2591_t *dev, tsl2591_integration_time_t integration_time)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    // Last 3 bits represent the integration time.
    I2C_DEV_CHECK(&dev->i2c_dev, 
        write_control_register(dev, (dev->settings.control_reg & ~0x07) | integration_time));
    dev->settings.control_reg = (dev->settings.control_reg & ~0x07) | integration_time;

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_get_integration_time(tsl2591_t *dev, tsl2591_integration_time_t *integration_time)
{
    CHECK_ARG(dev && integration_time);

    // Last 3 bits represent the integration time.
    *integration_time = dev->settings.control_reg & 0x07;

    return ESP_OK;
}

esp_err_t tsl2591_set_gain(tsl2591_t *dev, tsl2591_gain_t gain)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev, 
        write_control_register(dev, (dev->settings.control_reg & ~TSL2591_GAIN_MAX) | gain));
    dev->settings.control_reg = (dev->settings.control_reg & ~TSL2591_GAIN_MAX) | gain;

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_get_gain(tsl2591_t *dev, tsl2591_gain_t *gain)
{
    CHECK_ARG(dev && gain);

    *gain = dev->settings.control_reg & TSL2591_GAIN_MAX;

    return ESP_OK;
}


// Setter and getter persistence filter.
esp_err_t tsl2591_set_persistence_filter(tsl2591_t *dev, tsl2591_persistence_filter_t filter)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev, 
        write_register(dev, TSL2591_REG_PERSIST, (dev->settings.persistence_reg & ~TSL2591_60_CYCLES) | filter));
    dev->settings.persistence_reg = (dev->settings.persistence_reg & ~TSL2591_60_CYCLES) | filter;

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_get_persistence_filter(tsl2591_t *dev, tsl2591_persistence_filter_t *filter)
{
    CHECK_ARG(dev && filter);

    *filter = dev->settings.persistence_reg & TSL2591_60_CYCLES;

    return ESP_OK;
}


// Setters thresholds.
esp_err_t tsl2591_als_set_low_threshold(tsl2591_t *dev, uint16_t low_threshold)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev, write_register(dev, TSL2591_REG_AILTL, low_threshold));
    I2C_DEV_CHECK(&dev->i2c_dev, write_register(dev, TSL2591_REG_AILTH, low_threshold >> 8));

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_als_set_high_threshold(tsl2591_t *dev, uint16_t high_threshold)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev, write_register(dev, TSL2591_REG_AIHTL, high_threshold));
    I2C_DEV_CHECK(&dev->i2c_dev, write_register(dev, TSL2591_REG_AIHTH, high_threshold >> 8));

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_no_persist_set_low_threshold(tsl2591_t *dev, uint16_t low_threshold)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev, write_register(dev, TSL2591_REG_NPAILTL, low_threshold));
    I2C_DEV_CHECK(&dev->i2c_dev, write_register(dev, TSL2591_REG_NPAILTH, low_threshold >> 8));

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_no_persist_set_high_threshold(tsl2591_t *dev, uint16_t high_threshold)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev, write_register(dev, TSL2591_REG_NPAIHTL, high_threshold));
    I2C_DEV_CHECK(&dev->i2c_dev, write_register(dev, TSL2591_REG_NPAIHTH, high_threshold >> 8));

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}


// Special functions.
esp_err_t tsl2591_set_test_intr(tsl2591_t *dev)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev,
        write_special_function(dev, TSL2591_SPECIAL_SET_INTR));

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_clear_als_intr(tsl2591_t *dev)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev,
        write_special_function(dev, TSL2591_SPECIAL_CLEAR_INTR));

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_clear_als_np_intr(tsl2591_t *dev)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev,
        write_special_function(dev, TSL2591_SPECIAL_CLEAR_NP_INTR));

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_clear_both_intr(tsl2591_t *dev)
{
    CHECK_ARG(dev);

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev,
        write_special_function(dev, TSL2591_SPECIAL_CLEAR_BOTH));

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}


// Getters status flags.
esp_err_t tsl2591_get_np_intr_flag(tsl2591_t *dev, bool *flag)
{
    CHECK_ARG(dev && flag);
    
    uint8_t tmp;

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev,
        read_register(dev, TSL2591_REG_STATUS, &tmp));
    
    *flag = tmp & TSL2591_STATUS_ALS_NP_INTR ? true : false;

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_get_als_intr_flag(tsl2591_t *dev, bool *flag)
{
    CHECK_ARG(dev && flag);
    
    uint8_t tmp;

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev,
        read_register(dev, TSL2591_REG_STATUS, &tmp));
    
    *flag = tmp & TSL2591_STATUS_ALS_INTR ? true : false;

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}

esp_err_t tsl2591_get_als_valid_flag(tsl2591_t *dev, bool *flag)
{
    CHECK_ARG(dev && flag);
    
    uint8_t tmp;

    I2C_DEV_TAKE_MUTEX(&dev->i2c_dev);

    I2C_DEV_CHECK(&dev->i2c_dev,
        read_register(dev, TSL2591_REG_STATUS, &tmp));
    
    *flag = tmp & TSL2591_STATUS_ALS_VALID? true : false;

    I2C_DEV_GIVE_MUTEX(&dev->i2c_dev);

    return ESP_OK;
}