embedded-trainings-2020/embedded-workshop-book/src/bsc-exercise.md

BSC Exercise

In this exercise you will learn how to write a board support crate. The bsc template will already contain the led and timer implementation. The radio and USB/Power implementations will be deleted, because that just takes up unnecessary space and adds to confusion.

Learning goals

• implement buttons functionality
• uarte implementation
• impl blocks, associated functions, methods
• generate docs!

Steps

Write a button implementation

• add field in the board struct

• add struct for all buttons

• add struct for the single button

• Read docs, section 8.7 for info about pins and pin configuration

• add button bring up to board init

• add doc lines every where!

• add methods in impl block:

  • detect button push
  • debounce button function? like in knurling session, requires implementation of a second timer, just for this?

Write Uarte implementation

• add field to the board struct
• add struct for the instance, how to figure out what the type of the inner field is
• create instance in init, add baudrate, parity etc.
• add to instantiation of board struct
• impl fmt::Write for the Uarte struct, simple write does not work because of dma
• example code with button is not a good idea for the simple button implementation.

I think this is plenty for an hour.