Teensy StateMachine - UART and CANbus tests

[Iyury1]

Summary

Set up and test the external communication interfaces that will be used by the State Machine program.

The hardware target is a Teensy 4.1. This State Machine board will communicate with a Raspberry Pi with a UART connection, and will also communicate with the other Teensy development boards through a CANbus network.

Teensy 4.1 CAN library: https://github.com/tonton81/FlexCAN_T4 Teensy 3.6 CAN library: https://github.com/pawelsky/FlexCAN_Library

Checklist

• [ ] Send and receive UART messages to and from a Serial Monitor in PlatformIO using Serial.print() and Serial.read()
• [ ] Send and receive UART messages to and from the Raspberry Pi
• [ ] Send and receive CAN messages to and from a Teensy 3.6
• [ ] Send and receive CAN messages to and from another Teensy 4.1

[Iyury1]

The UART driver for the Teensy is not compatible with ChibiOS. We will be switching to STM32.