This project is a brief example of UART communication between an MSPM0 board and a CC1352 board. A source controller sends characters via UART to the MSPM0 board, which then filters for specific commands of variable length (a command is a string ended with a newline) in a tasklet before sending the corresponding variable-length command frame to a CC1352 board, which then changes its LED based on the frame's command.

Once each board has been flashed with the corresponding built binaries, the MSPM0 board receives signals via a UART connection through the micro-USB port, looking for the command strings toggle (toggle LED), off (turn off LED), and on (turn on LED) (while also echoing characters back). If any of the command strings are detected, the corresponding (variable-length) command is forwarded as a frame demarcated with HDLC flags (0x7e) at the beginning and end via a second UART connection in pins PB6 (TX pin) and PB7 (RX pin) to the CC1352 board. The CC1352 board has its own UART connection set up on pins DIO25 (TX pin) and DIO26 (RX pin), where it waits for the start of a frame, reads it in, then checks if it is any of the defined commands, at which point it performs the corresponding operation.

With this in mind, the following connections are required:

• Female-to-female from PB7 (MSPM0) to DIO25 (CC1352), PB6 (MSPM0) to DIO26 (CC1352)
• Both boards connected with USB-to-micro (only MSPM0 uses the UART connection, both utilize power and ground through cable)

Once these are made, one green and one red light should be lit up on both boards. By sending the above commands (via Putty, for example), the red light on the CC1352 board should turn on and off.