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zh_bh1750/zh_bh1750.c
Alexey Zholtikov 6961da0aa1 Version 1.0.2 
Added automatically sensitivity adjustment.
Fixed bug with sensitivity adjustment error on ESP32.
2024-07-03 12:33:38 +03:00

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#include "zh_bh1750.h"
#define LOW_RESOLUTION_MEASUREMENT_TIME 24 // L-Resolution mode measurement time.
#define HIGH_RESOLUTION_MEASUREMENT_TIME 180 // H-Resolution mode measurement time.
#define SENSITIVITY_DEFAULT 69
#define MEASUREMENT_TIME_HIGH_BIT 0x40 // Change measurement time (high bit).
#define MEASUREMENT_TIME_LOW_BIT 0x60 // Change measurement time (low bit).
#define CONTINUOUSLY_LOW_RESOLUTION 0x13 // Start measurement at 4 lx resolution.
#define CONTINUOUSLY_HIGH_RESOLUTION 0x10 // Start measurement at 1 lx resolution.
#define CONTINUOUSLY_HIGH_RESOLUTION_2 0x11 // Start measurement at 0.5 lx resolution.
#define ONE_TIME_LOW_RESOLUTION 0x23 // Start measurement at 4 lx resolution. It is automatically set to power down mode after measurement.
#define ONE_TIME_HIGH_RESOLUTION 0x20 // Start measurement at 1 lx resolution. It is automatically set to power down mode after measurement.
#define ONE_TIME_HIGH_RESOLUTION_2 0x21 // Start measurement at 0.5 lx resolution. It is automatically set to power down mode after measurement.
static zh_bh1750_init_config_t _init_config = {0};
static uint8_t _command = 0;
static bool _is_first_start = false;
static uint8_t _time = 0;
static uint8_t _sensivity = SENSITIVITY_DEFAULT;
static bool _is_initialized = false;
#ifndef CONFIG_IDF_TARGET_ESP8266
static i2c_master_dev_handle_t _bh1750_handle = {0};
#endif
esp_err_t _adjust(const uint8_t value);
static const char *TAG = "zh_bh1750";
esp_err_t zh_bh1750_init(const zh_bh1750_init_config_t *config)
{
ESP_LOGI(TAG, "BH1750 initialization begin.");
if (config == NULL)
{
ESP_LOGE(TAG, "BH1750 initialization fail. Invalid argument.");
return ESP_ERR_INVALID_ARG;
}
_init_config = *config;
#ifndef CONFIG_IDF_TARGET_ESP8266
i2c_device_config_t bh1750_config = {
.dev_addr_length = I2C_ADDR_BIT_LEN_7,
.device_address = _init_config.i2c_address,
.scl_speed_hz = 100000,
};
i2c_master_bus_add_device(_init_config.i2c_handle, &bh1750_config, &_bh1750_handle);
if (i2c_master_probe(_init_config.i2c_handle, _init_config.i2c_address, 1000 / portTICK_PERIOD_MS) != ESP_OK)
{
ESP_LOGE(TAG, "BH1750 initialization fail. Sensor not connected or not responded.");
return ESP_ERR_NOT_FOUND;
}
#endif
switch (_init_config.operation_mode)
{
case LOW_RESOLUTION:;
_command = (_init_config.work_mode == CONTINUOUSLY) ? CONTINUOUSLY_LOW_RESOLUTION : ONE_TIME_LOW_RESOLUTION;
_time = LOW_RESOLUTION_MEASUREMENT_TIME;
break;
case HIGH_RESOLUTION:;
_command = (_init_config.work_mode == CONTINUOUSLY) ? CONTINUOUSLY_HIGH_RESOLUTION : ONE_TIME_HIGH_RESOLUTION;
_time = HIGH_RESOLUTION_MEASUREMENT_TIME;
break;
case HIGH_RESOLUTION_2:;
_command = (_init_config.work_mode == CONTINUOUSLY) ? CONTINUOUSLY_HIGH_RESOLUTION_2 : ONE_TIME_HIGH_RESOLUTION_2;
_time = HIGH_RESOLUTION_MEASUREMENT_TIME;
break;
default:
break;
}
ESP_LOGI(TAG, "BH1750 initialization success.");
_is_initialized = true;
return ESP_OK;
}
esp_err_t zh_bh1750_read(float *data)
{
ESP_LOGI(TAG, "BH1750 read begin.");
if (data == NULL)
{
ESP_LOGE(TAG, "BH1750 read fail. Invalid argument.");
return ESP_ERR_INVALID_ARG;
}
if (_is_initialized == false)
{
ESP_LOGE(TAG, "BH1750 read fail. BH1750 not initialized.");
return ESP_ERR_NOT_FOUND;
}
REPEATE:;
esp_err_t esp_err = ESP_OK;
uint8_t sensor_data[2] = {0};
if (_init_config.work_mode == CONTINUOUSLY)
{
if (_is_first_start == true)
{
goto READ;
}
else
{
_is_first_start = true;
}
}
#ifdef CONFIG_IDF_TARGET_ESP8266
i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
i2c_master_start(i2c_cmd_handle);
i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_WRITE, true);
i2c_master_write_byte(i2c_cmd_handle, _command, true);
i2c_master_stop(i2c_cmd_handle);
esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
i2c_cmd_link_delete(i2c_cmd_handle);
#else
esp_err = i2c_master_transmit(_bh1750_handle, &_command, sizeof(_command), 1000 / portTICK_PERIOD_MS);
#endif
if (esp_err != ESP_OK)
{
ESP_LOGE(TAG, "BH1750 read fail. I2C driver error.");
return esp_err;
}
vTaskDelay(_time / portTICK_PERIOD_MS);
READ:
#ifdef CONFIG_IDF_TARGET_ESP8266
i2c_cmd_handle = i2c_cmd_link_create();
i2c_master_start(i2c_cmd_handle);
i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_READ, true);
i2c_master_read_byte(i2c_cmd_handle, &sensor_data[0], I2C_MASTER_ACK);
i2c_master_read_byte(i2c_cmd_handle, &sensor_data[1], I2C_MASTER_NACK);
i2c_master_stop(i2c_cmd_handle);
esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
i2c_cmd_link_delete(i2c_cmd_handle);
#else
esp_err = i2c_master_receive(_bh1750_handle, sensor_data, sizeof(sensor_data), 1000 / portTICK_PERIOD_MS);
#endif
if (esp_err != ESP_OK)
{
ESP_LOGE(TAG, "BH1750 read fail. I2C driver error.");
return esp_err;
}
uint32_t raw_data = sensor_data[0] << 8 | sensor_data[1];
if (raw_data == 65535 || raw_data == 0)
{
ESP_LOGW(TAG, "BH1750 read error. Sensitivity adjustment required. Current sensivity level %d.", _sensivity);
}
if (_init_config.auto_adjust == true)
{
if (raw_data == 65535 && _sensivity > 31)
{
if (_adjust(_sensivity - 1) == ESP_OK)
{
goto REPEATE;
}
}
if (raw_data == 0 && _sensivity < 254)
{
if (_adjust(_sensivity + 1) == ESP_OK)
{
goto REPEATE;
}
}
}
if (_init_config.operation_mode == HIGH_RESOLUTION_2)
{
*data = raw_data * (1 / 1.2 * ((float)SENSITIVITY_DEFAULT / _sensivity) / 2);
}
else
{
*data = raw_data * (1 / 1.2 * ((float)SENSITIVITY_DEFAULT / _sensivity));
}
ESP_LOGI(TAG, "BH1750 read success.");
return ESP_OK;
}
esp_err_t zh_bh1750_adjust(const uint8_t value)
{
if (_init_config.auto_adjust == true)
{
ESP_LOGE(TAG, "BH1750 adjust fail. Auto adjust is enabled.");
return ESP_ERR_NOT_FOUND;
}
return _adjust(value);
}
esp_err_t _adjust(const uint8_t value)
{
ESP_LOGI(TAG, "BH1750 adjust begin.");
if ((value < 31 || value > 254))
{
ESP_LOGE(TAG, "BH1750 adjust fail. Invalid argument.");
return ESP_ERR_INVALID_ARG;
}
if (_is_initialized == false)
{
ESP_LOGE(TAG, "BH1750 read fail. BH1750 not initialized.");
return ESP_ERR_NOT_FOUND;
}
esp_err_t esp_err = ESP_OK;
uint8_t sensitivity_data[2] = {value >> 5 | MEASUREMENT_TIME_HIGH_BIT, (value & 0b00011111) | MEASUREMENT_TIME_LOW_BIT};
#ifdef CONFIG_IDF_TARGET_ESP8266
i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
i2c_master_start(i2c_cmd_handle);
i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_WRITE, true);
i2c_master_write_byte(i2c_cmd_handle, sensitivity_data[0], true);
i2c_master_stop(i2c_cmd_handle);
esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
i2c_cmd_link_delete(i2c_cmd_handle);
if (esp_err != ESP_OK)
{
ESP_LOGE(TAG, "BH1750 adjust fail. I2C driver error.");
return esp_err;
}
i2c_cmd_handle = i2c_cmd_link_create();
i2c_master_start(i2c_cmd_handle);
i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_WRITE, true);
i2c_master_write_byte(i2c_cmd_handle, sensitivity_data[1], true);
i2c_master_stop(i2c_cmd_handle);
esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
i2c_cmd_link_delete(i2c_cmd_handle);
#else
esp_err = i2c_master_transmit(_bh1750_handle, &sensitivity_data[0], 1, 1000 / portTICK_PERIOD_MS);
esp_err = i2c_master_transmit(_bh1750_handle, &sensitivity_data[1], 1, 1000 / portTICK_PERIOD_MS);
#endif
if (esp_err != ESP_OK)
{
ESP_LOGE(TAG, "BH1750 adjust fail. I2C driver error.");
return esp_err;
}
if (_init_config.work_mode == CONTINUOUSLY)
{
_is_first_start = false;
}
_sensivity = value;
ESP_LOGI(TAG, "BH1750 adjust success.");
return ESP_OK;
}
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