Handle UART Received Data

Now you have a working framework, with UART interrupts firing and being handled. Let’s try adding a #[local] resource of our own.

✅ Modify the program so that it checks which character has been received on the UART, and have it report the total number of ASCII letter 'x' characters that have been received.

You’ll probably want an additional resource for this.

See stm32-code/standalone-app/src/bin/standalone-rtic-uart-complete.rs for a solution.

✅ Bonus exercise: merge the standalone-rtic-blink and standalone-rtic-uart programs, so that ASCII characters sent over the UART cause the colour of the blinking LED to change. You may need a #[shared] resource for this.