qm-bme280

Bosch Sensortec BME280 Environmental Driver for Intel(r) QMSI

Introduction

This driver provides support for Bosch Sensortec BME280 environmental sensor for projects developed using Intel(r) Quark(tm) Microcontroller Software Interface (aka QMSI). The driver currently only supports sensors connected using I2C interface.

Hardware Configuration

Supported BME280 breakout boards

This driver has been tested with the following breakout boards:

• Adafruit BME280 I2C or SPI Temperature Humidity Pressure Sensor; Product ID: 2652
• MikroElektronika Weather click; Product ID: MIKROE-1978

Wiring - I2C Interface

Signal Name	Breakout Board Pin Name	Intel(r) Quark(tm) D2000 Board Pin Name	Notes
Ground	GND	GND
Power Supply	VIN (Adafruit)	5V or 3.3V	Adafruit BME280 board contains a 3.3V regulator and it will work from either 3.3V or 5V
Power Supply, 3.3V	3.3V (MikroElektronika)	3.3V	MikroElektronika Weather Click must use 3.3V power supply
I2C Data	SDA, SDI (Adafruit)	A4 or SDA
I2C Clock	SCL, SCK (Adafruit)	A5 or SCL
I2C Address	SDO (Adafruit)	GND	Connecting SDO pin to the GND sets I2C address to 0x76 instead of 0x77

Using the Driver

Building the Sample Application

1. Create a new QMSI based project, for example using Intel(r) System Studio for Microcontrollers
2. Copy main.c, bme280.h, and bme280.c files to your project directory
3. Build and run the project

Integrating the Driver in Your Application

1. Create a new QMSI based project, for example using Intel(r) System Studio for Microcontrollers
2. Copy bme280.h and bme280.c files to your project directory
3. Add include "bme280.h" line in your main.c
4. Edit bme280.h.

• Set BME280_I2C_ADDR to 'BME280_I2C_ADDR_77' or 'BME280_I2C_ADDR_76' according to your BME280 sensor I2C address
• If needed, update other constants in the default configuration section of the file

5. Add I2C initialization code. Refer to setup() function in main.c included with this driver.
6. From your code call bme280_init(), and then use other bme280_*() functions in your application as needed. Refer to main.c for usage example.