169 lines
6.4 KiB
C
169 lines
6.4 KiB
C
#include "zh_bh1750.h"
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#define LOW_RESOLUTION_MEASUREMENT_TIME 24 // L-Resolution mode measurement time max value.
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#define HIGH_RESOLUTION_MEASUREMENT_TIME 180 // H-Resolution mode measurement time max value.
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#define SENSITIVITY_DEFAULT 69
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#define MEASUREMENT_TIME_HIGH_BIT 0x40 // Change measurement time (high bit).
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#define MEASUREMENT_TIME_LOW_BIT 0x60 // Change measurement time (low bit).
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#define CONTINUOUSLY_LOW_RESOLUTION 0x13 // Start measurement at 4 lx resolution.
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#define CONTINUOUSLY_HIGH_RESOLUTION 0x10 // Start measurement at 1 lx resolution.
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#define CONTINUOUSLY_HIGH_RESOLUTION_2 0x11 // Start measurement at 0.5 lx resolution.
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#define ONE_TIME_LOW_RESOLUTION 0x23 // Start measurement at 4 lx resolution. It is automatically set to power down mode after measurement.
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#define ONE_TIME_HIGH_RESOLUTION 0x20 // Start measurement at 1 lx resolution. It is automatically set to power down mode after measurement.
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#define ONE_TIME_HIGH_RESOLUTION_2 0x21 // Start measurement at 0.5 lx resolution. It is automatically set to power down mode after measurement.
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static zh_bh1750_init_config_t _init_config = {0};
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static uint8_t _command = 0;
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static bool _is_first_start = false;
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static uint8_t _time = 0;
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static uint8_t _sensivity = SENSITIVITY_DEFAULT;
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static bool _is_initialized = false;
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static const char *TAG = "zh_bh1750";
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esp_err_t zh_bh1750_init(zh_bh1750_init_config_t *config)
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{
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ESP_LOGI(TAG, "BH1750 initialization begin.");
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if (config == NULL)
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{
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ESP_LOGE(TAG, "BH1750 initialization fail. Invalid argument.");
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return ESP_ERR_INVALID_ARG;
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}
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_init_config = *config;
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switch (_init_config.operation_mode)
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{
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case LOW_RESOLUTION:;
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_command = (_init_config.work_mode == CONTINUOUSLY) ? CONTINUOUSLY_LOW_RESOLUTION : ONE_TIME_LOW_RESOLUTION;
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_time = LOW_RESOLUTION_MEASUREMENT_TIME;
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break;
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case HIGH_RESOLUTION:;
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_command = (_init_config.work_mode == CONTINUOUSLY) ? CONTINUOUSLY_HIGH_RESOLUTION : ONE_TIME_HIGH_RESOLUTION;
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_time = HIGH_RESOLUTION_MEASUREMENT_TIME;
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break;
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case HIGH_RESOLUTION_2:;
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_command = (_init_config.work_mode == CONTINUOUSLY) ? CONTINUOUSLY_HIGH_RESOLUTION_2 : ONE_TIME_HIGH_RESOLUTION_2;
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_time = HIGH_RESOLUTION_MEASUREMENT_TIME;
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break;
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default:
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break;
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}
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ESP_LOGI(TAG, "BH1750 initialization success.");
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_is_initialized = true;
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return ESP_OK;
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}
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esp_err_t zh_bh1750_read(float *data)
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{
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ESP_LOGI(TAG, "BH1750 read begin.");
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if (data == NULL)
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{
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ESP_LOGE(TAG, "BH1750 read fail. Invalid argument.");
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return ESP_ERR_INVALID_ARG;
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}
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if (_is_initialized == false)
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{
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ESP_LOGE(TAG, "BH1750 read fail. BH1750 not initialized.");
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return ESP_ERR_NOT_FOUND;
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}
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esp_err_t esp_err = ESP_OK;
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uint8_t sensor_data_high = 0;
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uint8_t sensor_data_low = 0;
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if (_init_config.work_mode == CONTINUOUSLY)
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{
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if (_is_first_start == true)
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{
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goto READ;
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}
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else
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{
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_is_first_start = true;
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}
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}
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i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
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i2c_master_start(i2c_cmd_handle);
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i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(i2c_cmd_handle, _command, true);
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i2c_master_stop(i2c_cmd_handle);
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esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
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i2c_cmd_link_delete(i2c_cmd_handle);
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if (esp_err != ESP_OK)
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{
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ESP_LOGE(TAG, "BH1750 read fail. I2C driver error.");
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return esp_err;
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}
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vTaskDelay(((_sensivity / SENSITIVITY_DEFAULT) * _time) / portTICK_PERIOD_MS);
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READ:
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i2c_cmd_handle = i2c_cmd_link_create();
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i2c_master_start(i2c_cmd_handle);
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i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_READ, true);
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i2c_master_read_byte(i2c_cmd_handle, &sensor_data_high, I2C_MASTER_ACK);
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i2c_master_read_byte(i2c_cmd_handle, &sensor_data_low, I2C_MASTER_NACK);
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i2c_master_stop(i2c_cmd_handle);
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esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
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i2c_cmd_link_delete(i2c_cmd_handle);
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if (esp_err != ESP_OK)
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{
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ESP_LOGE(TAG, "BH1750 read fail. I2C driver error.");
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return esp_err;
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}
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if (_init_config.operation_mode == HIGH_RESOLUTION_2)
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{
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*data = (sensor_data_high << 8 | sensor_data_low) * (1 / 1.2 * (69.0 / _sensivity) / 2);
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}
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else
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{
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*data = (sensor_data_high << 8 | sensor_data_low) * (1 / 1.2 * (69.0 / _sensivity));
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}
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ESP_LOGI(TAG, "BH1750 read success.");
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return ESP_OK;
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}
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esp_err_t zh_bh1750_adjust(uint8_t value)
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{
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ESP_LOGI(TAG, "BH1750 adjust begin.");
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if ((value < 31 || value > 254))
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{
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ESP_LOGE(TAG, "BH1750 adjust fail. Invalid argument.");
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return ESP_ERR_INVALID_ARG;
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}
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if (_is_initialized == false)
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{
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ESP_LOGE(TAG, "BH1750 read fail. BH1750 not initialized.");
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return ESP_ERR_NOT_FOUND;
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}
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esp_err_t esp_err = ESP_OK;
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_sensivity = value;
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i2c_cmd_handle_t i2c_cmd_handle = i2c_cmd_link_create();
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i2c_master_start(i2c_cmd_handle);
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i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(i2c_cmd_handle, value >> 5 | MEASUREMENT_TIME_HIGH_BIT, true);
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i2c_master_stop(i2c_cmd_handle);
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esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
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i2c_cmd_link_delete(i2c_cmd_handle);
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if (esp_err != ESP_OK)
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{
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ESP_LOGE(TAG, "BH1750 adjust fail. I2C driver error.");
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return esp_err;
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}
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i2c_cmd_handle = i2c_cmd_link_create();
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i2c_master_start(i2c_cmd_handle);
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i2c_master_write_byte(i2c_cmd_handle, _init_config.i2c_address << 1 | I2C_MASTER_WRITE, true);
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i2c_master_write_byte(i2c_cmd_handle, (value & 0b00011111) | MEASUREMENT_TIME_LOW_BIT, true);
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i2c_master_stop(i2c_cmd_handle);
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esp_err = i2c_master_cmd_begin(_init_config.i2c_port, i2c_cmd_handle, 1000 / portTICK_PERIOD_MS);
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i2c_cmd_link_delete(i2c_cmd_handle);
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if (esp_err != ESP_OK)
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{
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ESP_LOGE(TAG, "BH1750 adjust fail. I2C driver error.");
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return esp_err;
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}
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if (_init_config.work_mode == CONTINUOUSLY)
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{
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_is_first_start = false;
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}
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ESP_LOGI(TAG, "BH1750 adjust success.");
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return ESP_OK;
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} |