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Mirabellensaft 2023-03-14 14:33:18 +01:00
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6
embedded-workshop-book/src/enabling-uarte.md
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@ -1,10 +1,10 @@
# Enabling the UARTE0 peripheral # Enabling the UARTE0 peripheral
Write a simple program which uses the PAC to enable the UART. See how writing arbitrary values to the ENABLE field in the ENABLE register is unsafe, because only values 0 or 8 should be used. Write a simple program which uses the PAC to enable the UARTE0. See how writing arbitrary values to the ENABLE field in the ENABLE register is unsafe, because only values 0 or 8 should be used.
## In this exercise you will learn how to: ## In this exercise you will learn how to:
* to safely write into a register * to safely write into a register
* how to unsafely write into a register * how to write raw bits into a register
* how to read a register * how to read a register
## Prerequisites ## Prerequisites
@ -27,7 +27,7 @@ Uarte0 is disabled.
``` ```
Find the starter code in `down-the-stack/apps/uarte_enable.rs` Find the starter code in `down-the-stack/apps/uarte_enable.rs`
Find the full solution in `down-the-stack/apps/uarte_enable_solution.rs` Find the full solution in `down-the-stack/solutions/uarte_enable.rs`
## Step-by-Step Solution ## Step-by-Step Solution

2
embedded-workshop-book/src/pac-docs.md
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@ -33,7 +33,7 @@ Note the difference between the struct field `UARTE0` in `Peripherals` and the m
## Finding corresponding sections in the PAC ## Finding corresponding sections in the PAC
* `dk_pac/src/lib.rs` defines the single peripherals with their register block addresses and contains a struct defintion for the `struct Peripherals`. There are two methods for this struct: `take()` and `steal()`. `take()` assures, that only one instance of this can exist. Hence, it's safe. Note that `take()` is only available with the `critical-section` feature enabled. * `dk_pac/src/lib.rs` defines the single peripherals with their register block addresses and contains a struct definition for the `struct Peripherals`. There are two methods for this struct: `take()` and `steal()`. `take()` assures, that only one instance of this can exist. Hence, it's safe. Note that `take()` is only available with the `critical-section` feature enabled.
* `dk_pac/src/uarte0.rs` defines a struct that contains all the registers of the `UARTE0` register block. The `enable` field represents the register of the same name. * `dk_pac/src/uarte0.rs` defines a struct that contains all the registers of the `UARTE0` register block. The `enable` field represents the register of the same name.