BMP280 Dual Mode Driver (I2C/SPI) for STM32 Nucleo F0 Boards

This is a dual-mode driver for the BMP280 sensor, supporting both I2C and SPI communication interfaces. Written using the ARM-CMSIS standard, the driver provides complete Low-Level (LL) support and control for the BMP280 on STM32 Nucleo F0 boards.

Features

• Supports both I2C and SPI communication modes
• ARM-CMSIS standard-based driver implementation
• Complete LL support for controlling the BMP280 sensor
• Configurable I2C and SPI parameters for optimal performance
• Compatible with STM32 Nucleo F0 series boards

Usage

1. Download or clone this repository.
2. Add the driver files to the src folder of your STM32CubeIDE project.
3. Initialize the driver in your main application code and configure the sensor according to your desired mode (I2C or SPI).
4. Important (For spi mode only): To ensure proper initialization settings take effect, follow these steps:
   • First, initialize the BMP280 in I2C mode by uploading the i2c driver. This configures the initialization settings of the sensor.
   • Once I2C mode is initialized and the configuration is complete, switch to SPI mode and upload the spi driver for normal operation (will be fixed later).
5. For the initialization sequence and example code, refer to initialization.
6. Change oversampling and other config settings for the bmp280 in the i2c.h file to your liking. See datasheet for reference.

Connection Table

I2C Connection (Nucleo F0 board)

BMP280 Pin	STM32 Pin	Function
VDD	3.3V	Power
GND	GND	Ground
SCL	PB8 (I2C1 SCL)	Clock
SDA	PB9 (I2C1 SDA)	Data

SPI Connection (Nucleo F0 board)

BMP280 Pin	STM32 Pin	Function
VDD	3.3V	Power
GND	GND	Ground
SCK	PA5 (SPI1 SCK)	Clock
SDI	PA6 (SPI1 MISO)	MISO
SDO	PA7 (SPI1 MOSI)	MOSI
CS	PA4 (SPI1 NSS)	Chip Select

Known Bugs

• I2C Communication Issue: For certain defective HW-611 BMP280 boards, the sensor may not update temperature and pressure under certain I2C configurations due to hardware limitations. To overcome this, you need to use Adafruit's I2C driver first in the Arduino IDE and then apply this driver in STM32CubeIDE. This workaround resolves issues with the defective boards and ensures proper operation.

Dependencies

• STM32CubeIDE
• ARM-CMSIS Headers

License

This project is licensed under the MIT License.

Initialization

//Example sequence for i2c init
/*

#include <stdint.h>
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include "stm32f030x8.h"
#include "bmp280_i2c.h"
#include "usart.h"

int main() {

	bmp_i2c_setup() ;

	while (1) {

//init config settings
	bmp_i2c_write(0xF5, CONFIG_SETTING); //Recommended to apply init every loop if power loss is to be expected.
	bmp_i2c_write(0xF4, CTRL_MEAS_SETTING);


		double temp = 0;
		double press = 0;

		temp = temperature(0);
		press = pressure();

		printf("temp %f\n", temp);
		printf("press %f\n", press);

		

	}

}
*/



//Example sequence for spi init
/*
#include <stdint.h>
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include "stm32f030x8.h"
#include "bmp280_spi.h"
#include "usart.h"

int main() {

	usart_gpio_init();
	usart_init();
	bmp_spi_rcc_config();
	bmp_spi_gpio_config();
	bmp_spi_config();

	while (1) {

	


		double temp = 0;
		double press = 0;

		temp = spi_temperature(0);
		press = spi_pressure();

		printf("temp %f\n", temp);
		printf("press %f\n", press);

		delay_1s_spi();

	}

}
*/

Datasheet for reference

bst-bmp280-ds001.pdf