utkumaden / esp-idf-bmx280

BMP280 and BME280 I2C driver for ESP32 boards using the IDF toolchain.

BMX280 for ESP-IDF

BMX280 is a basic I2C based driver for ESP32 devices licensed mostly under MIT. (See caption "License" for details.)

Usage

Clone this repository or add it as a submodule into your components directory. Add the module as a requirement to your main module, or other modules.

Example Code

#include "esp_log.h"
#include "bmx280.h"

void app_main(void)
{
    // Entry Point
    //ESP_ERROR_CHECK(nvs_flash_init());
    i2c_config_t i2c_cfg = {
        .mode = I2C_MODE_MASTER,
        .sda_io_num = GPIO_NUM_17,
        .scl_io_num = GPIO_NUM_16,
        .sda_pullup_en = false,
        .scl_pullup_en = false,

        .master = {
            .clk_speed = 100000
        }
    };

    ESP_ERROR_CHECK(i2c_param_config(I2C_NUM_0, &i2c_cfg));
    ESP_ERROR_CHECK(i2c_driver_install(I2C_NUM_0, I2C_MODE_MASTER, 0, 0, 0));

    bmx280_t* bmx280 = bmx280_create(I2C_NUM_0);

    if (!bmx280) { 
        ESP_LOGE("test", "Could not create bmx280 driver.");
        return;
    }

    ESP_ERROR_CHECK(bmx280_init(bmx280));

    bmx280_config_t bmx_cfg = BMX280_DEFAULT_CONFIG;
    ESP_ERROR_CHECK(bmx280_configure(bmx280, &bmx_cfg));

    while (1)
    {
        ESP_ERROR_CHECK(bmx280_setMode(bmx280, BMX280_MODE_FORCE));
        do {
            vTaskDelay(pdMS_TO_TICKS(1));
        } while(bmx280_isSampling(bmx280));

        float temp = 0, pres = 0, hum = 0;
        ESP_ERROR_CHECK(bmx280_readoutFloat(bmx280, &temp, &pres, &hum));

        ESP_LOGI("test", "Read Values: temp = %f, pres = %f, hum = %f", temp, pres, hum);
    }
}

License

This repository contains a lot of code I have written which is licensed under MIT, however there are sections modified from the BME280 datasheet which is unclearly licensed.

The unclearly licensed section is clearly marked with two comments. Any code between // HERE BE DRAGONS and // END OF DRAGONS contains modified versions of the Bosch Sensortec code.

Please take note of this in production.