ContextQMD
Back to Comprehensive Rust

Multiple registers

src/bare-metal/aps/better-uart/registers.md

latest751 B
Original Source
<!-- Copyright 2023 Google LLC SPDX-License-Identifier: CC-BY-4.0 -->

Multiple registers

We can use a struct to represent the memory layout of the UART's registers.

<!-- mdbook-xgettext: skip -->
rust,editable,compile_fail
# // Copyright 2023 Google LLC
# // SPDX-License-Identifier: Apache-2.0
#
{{#include ../examples/src/pl011_struct.rs:Registers}}
<details>
  • #[repr(C)] tells the compiler to lay the struct fields out in order, following the same rules as C. This is necessary for our struct to have a predictable layout, as default Rust representation allows the compiler to (among other things) reorder fields however it sees fit.
</details>