Firmware Architecture Overview

The project has a simple layered structure:

Application Layer main.c

• initializes HAL, clocks, GPIO, I2C1, and USART1
• initializes the MPL3115A2 driver
• polls data-ready status bits
• prints converted temperature and pressure values

MPL3115A2 Driver Layer MPL3115A2/mpl3115a2.c MPL3115A2/mpl3115a2.h

• owns MPL3115A2 register definitions
• stores the active I2C handle and device address
• verifies WHO_AM_I
• configures pressure/temperature data-ready events
• reads and converts pressure and temperature samples

STM32 HAL / CubeMX Layer Core/Src/main.c Core/Inc/main.h

• provides generated peripheral initialization
• provides HAL I2C, UART, GPIO, timer, and clock services