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Add bh1750, aht20, sgp40 drivers unified on native i2c_master API

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Forked from managed_components (espressif/bh1750, espressif/aht20,
esp-idf-lib/sgp40) and rewrote aht20/sgp40 internals to use
driver/i2c_master.h directly instead of the i2c_bus and i2cdev
wrapper components, so all three sensors share one create/delete
handle pattern over a single i2c_master_bus_handle_t.
This commit is contained in:
Julien Lazarewicz
2026-07-05 23:27:50 +02:00
commit e940c767a6
19 changed files with 2441 additions and 0 deletions
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idf_component_register(
SRCS "bh1750.c"
INCLUDE_DIRS "include"
REQUIRES "esp_driver_i2c"
)

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/*
* SPDX-FileCopyrightText: 2015-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "bh1750.h"
#include "driver/i2c_master.h"
#include "freertos/FreeRTOS.h"
#include "freertos/projdefs.h" // for pdMS_TO_TICKS
#define BH_1750_MEASUREMENT_ACCURACY \
1.2 /*!< the typical measurement accuracy of BH1750 sensor \
*/
#define BH1750_POWER_DOWN 0x00 /*!< Command to set Power Down*/
#define BH1750_POWER_ON 0x01 /*!< Command to set Power On*/
#define I2C_CLK_SPEED 400000
typedef struct
{
i2c_master_dev_handle_t i2c_handle;
} bh1750_dev_t;
static esp_err_t bh1750_write_byte(const bh1750_dev_t* const sens, const uint8_t byte)
{ return i2c_master_transmit(sens->i2c_handle, &byte, 1, pdMS_TO_TICKS(1000)); }
esp_err_t bh1750_create(i2c_master_bus_handle_t i2c_bus,
const uint8_t dev_addr,
bh1750_handle_t* handle_ret)
{
esp_err_t ret = ESP_OK;
bh1750_dev_t* sensor = (bh1750_dev_t*) calloc(1, sizeof(bh1750_dev_t));
if (!sensor)
{
return ESP_ERR_NO_MEM;
}
// Add new I2C device
const i2c_device_config_t i2c_dev_cfg = {
.device_address = dev_addr,
.scl_speed_hz = I2C_CLK_SPEED,
};
ret = i2c_master_bus_add_device(i2c_bus, &i2c_dev_cfg, &sensor->i2c_handle);
if (ret != ESP_OK)
{
free(sensor);
return ret;
}
assert(sensor->i2c_handle);
*handle_ret = sensor;
return ret;
}
esp_err_t bh1750_delete(bh1750_handle_t sensor)
{
bh1750_dev_t* sens = (bh1750_dev_t*) sensor;
if (sens->i2c_handle)
{
i2c_master_bus_rm_device(sens->i2c_handle);
}
free(sens);
return ESP_OK;
}
esp_err_t bh1750_power_down(bh1750_handle_t sensor)
{
bh1750_dev_t* sens = (bh1750_dev_t*) sensor;
return bh1750_write_byte(sens, BH1750_POWER_DOWN);
}
esp_err_t bh1750_power_on(bh1750_handle_t sensor)
{
bh1750_dev_t* sens = (bh1750_dev_t*) sensor;
return bh1750_write_byte(sens, BH1750_POWER_ON);
}
esp_err_t bh1750_set_measure_time(bh1750_handle_t sensor, const uint8_t measure_time)
{
bh1750_dev_t* sens = (bh1750_dev_t*) sensor;
uint32_t i = 0;
uint8_t buf[2] = { 0x40, 0x60 }; // constant part of the the MTreg
buf[0] |= measure_time >> 5;
buf[1] |= measure_time & 0x1F;
for (i = 0; i < 2; i++)
{
esp_err_t ret = bh1750_write_byte(sens, buf[i]);
if (ESP_OK != ret)
{
return ret;
}
}
return ESP_OK;
}
esp_err_t bh1750_set_measure_mode(bh1750_handle_t sensor, const bh1750_measure_mode_t cmd_measure)
{
bh1750_dev_t* sens = (bh1750_dev_t*) sensor;
return bh1750_write_byte(sens, (uint8_t) cmd_measure);
}
esp_err_t bh1750_get_data(bh1750_handle_t sensor, float* const data)
{
bh1750_dev_t* sens = (bh1750_dev_t*) sensor;
uint8_t read_buffer[2];
esp_err_t ret = i2c_master_receive(
sens->i2c_handle, read_buffer, sizeof(read_buffer), pdMS_TO_TICKS(1000));
if (ESP_OK != ret)
{
return ret;
}
*data = ((read_buffer[0] << 8 | read_buffer[1]) / BH_1750_MEASUREMENT_ACCURACY);
return ESP_OK;
}

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bh1750/idf_component.yml Normal file
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dependencies:
idf: '>=5.3'
description: I2C driver for BH1750 light sensor (native driver/i2c_master.h API)
version: 2.0.0

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/*
* SPDX-FileCopyrightText: 2015-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief BH1750 driver
*/
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
#include "driver/i2c_types.h"
#include "esp_err.h"
typedef enum {
BH1750_CONTINUE_1LX_RES = 0x10, /*!< Command to set measure mode as Continuously H-Resolution mode*/
BH1750_CONTINUE_HALFLX_RES = 0x11, /*!< Command to set measure mode as Continuously H-Resolution mode2*/
BH1750_CONTINUE_4LX_RES = 0x13, /*!< Command to set measure mode as Continuously L-Resolution mode*/
BH1750_ONETIME_1LX_RES = 0x20, /*!< Command to set measure mode as One Time H-Resolution mode*/
BH1750_ONETIME_HALFLX_RES = 0x21, /*!< Command to set measure mode as One Time H-Resolution mode2*/
BH1750_ONETIME_4LX_RES = 0x23, /*!< Command to set measure mode as One Time L-Resolution mode*/
} bh1750_measure_mode_t;
#define BH1750_I2C_ADDRESS_DEFAULT (0x23)
typedef void *bh1750_handle_t;
/**
* @brief Set bh1750 as power down mode (low current)
*
* @param sensor object handle of bh1750
*
* @return
* - ESP_OK Success
* - ESP_FAIL Fail
*/
esp_err_t bh1750_power_down(bh1750_handle_t sensor);
/**
* @brief Set bh1750 as power on mode
*
* @param sensor object handle of bh1750
*
* @return
* - ESP_OK Success
* - ESP_FAIL Fail
*/
esp_err_t bh1750_power_on(bh1750_handle_t sensor);
/**
* @brief Get light intensity from bh1750
*
* @param sensor object handle of bh1750
* @param[in] cmd_measure the instruction to set measurement mode
*
* @note
* You should call this funtion to set measurement mode before call bh1750_get_data() to acquire data.
* If you set onetime mode, you just can get one measurement result.
* If you set continuous mode, you can call bh1750_get_data() to acquire data repeatedly.
*
* @return
* - ESP_OK Success
* - ESP_FAIL Fail
*/
esp_err_t bh1750_set_measure_mode(bh1750_handle_t sensor, const bh1750_measure_mode_t cmd_measure);
/**
* @brief Get light intensity from BH1750
*
* Returns light intensity in [lx] corrected by typical BH1750 Measurement Accuracy (= 1.2).
*
* @see BH1750 datasheet Rev. D page 2
*
* @note
* You should acquire data from the sensor after the measurement time is over,
* so take care of measurement time in different modes.
*
* @param sensor object handle of bh1750
* @param[out] data light intensity value got from bh1750 in [lx]
*
* @return
* - ESP_OK Success
* - ESP_FAIL Fail
*/
esp_err_t bh1750_get_data(bh1750_handle_t sensor, float *const data);
/**
* @brief Set measurement time
*
* This function is used to adjust BH1750 sensitivity, i.e. compensating influence from optical window.
*
* @see BH1750 datasheet Rev. D page 11
*
* @param sensor object handle of bh1750
* @param[in] measure_time measurement time
*
* @return
* - ESP_OK Success
* - ESP_FAIL Fail
*/
esp_err_t bh1750_set_measure_time(bh1750_handle_t sensor, const uint8_t measure_time);
/**
* @brief Create and init sensor object and return a sensor handle
*
* @param[in] i2c_bus I2C bus handle. Obtained from i2c_new_master_bus().s
* @param[in] dev_addr I2C device address of sensor. Use BH1750_I2C_ADDRESS_DEFAULT for default address.
* @param[out] handle_ret Handle to created BH1750 driver object.
*
* @return
* - ESP_OK Success
* - ESP_ERR_NO_MEM Not enough memory for the driver
* - ESP_ERR_NOT_FOUND Sensor not found on the I2C bus
* - Others Error from underlying I2C driver
*/
esp_err_t bh1750_create(i2c_master_bus_handle_t i2c_bus, const uint8_t dev_addr, bh1750_handle_t *handle_ret);
/**
* @brief Delete and release a sensor object
*
* @param sensor object handle of bh1750
*
* @return
* - ESP_OK Success
* - ESP_FAIL Fail
*/
esp_err_t bh1750_delete(bh1750_handle_t sensor);
#ifdef __cplusplus
}
#endif