stm32 UART + I2C comms

[akielaries]

Get communication from stm32->RPi using UART to start. I eventually want to burn one of the small stm32s on the fan control circuit as the main controller. Next digging into I2C communication with the BME280 to collect the climate data from this sensor to eventually send off. Next dig into how the ESP8266 can work with the stm32 and send the BME data that way. To start, sending over UART to the RPi or even a beaglebone to publish to the DB would be nice

UART Focus

• [x] base baremetal UART transmission STM32 -> RPi4
  • A2(TX) -> P10(RX)
  • A3(RX) -> P08(TX)
• [ ] Cleanup implementation

  I2C

• [ ] base baremetal I2C transmission BME280 -> STM32

[akielaries]

With baremetal transmission working, cleanup implementation and either add onto stm.h "HAL" or create one specifically for UART