Bare Metal I2C

An implementation of using bare metal code to read temperature, pressure data from a BMP280 sensor using I2C

Required programs/libraries:

• arm-none-eabi-gcc
• arm-none-eabi-newlib
• arm-none-eabi-binutils
• openocd
• makefile
• any serial monitor

PIN configurations

Use these PIN configurations:

• Connect GPIOB7 pin -> SDA of BMP sensor
• Connect GPIOB8 pin -> SCL of BMP sensor
• GND -> SDO of BMP
• GND -> GND of BMP
• VCC -> VCC of BMP

Compile

Go to terminal and run

make allclean

Flash and Debugging:

I used openocd to connect to STM32 board. Then used telnet client to connect to openocd server. Terminal Commands: Running OpenOcd:

make load

Connecting to OpenOcd:

telnet localhost 4444

After that just send commands to talk to the board.

Halting

telnet> halt

Flashing

telnet> flash write_image erase final.elf

Resetting

telnet> reset

Ignore any warning.

After making changes to code just do make allclean and halt, flash, reset in order.

UART between PC and MCU

I have also connected pc with mcu using usart2. I used CuteCom as my serial port monitor. Baud rate used = 115200