How to implement string expectation by uart?

Question

STM

For example, I send "led on" to uart, which starts subroutine 1 and "led off", which starts subroutine 2. Also, other commands or noise can come to uart that do not need to be processed, how to implement this?

Answer 1

1. There should be no noise in the UART. This is a digital protocol.
2. You configure uart
3. You read data from the stream via read! and readln!
4. Decode the data
5. Through if or match you choose what to do