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book: Add note to remember to choose target

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CuriouslyCurious 2021-07-28 13:55:12 +02:00
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book/en/src/by-example/app.md
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@ -53,6 +53,10 @@ $ cargo run --example init
{{#include ../../../../ci/expected/init.run}} {{#include ../../../../ci/expected/init.run}}
``` ```
> **NOTE**: Remember to always specify your chosen target device or configure
> one to be used by default in `.cargo/config.toml`. In this case, we use
> a Cortex M3 running in QEMU so the target is `thumbv7m-none-eabi`.
## `idle` ## `idle`
A function marked with the `idle` attribute can optionally appear in the A function marked with the `idle` attribute can optionally appear in the
@ -120,7 +124,7 @@ crate. When the `priority` argument is omitted, the priority is assumed to be
`1`. The `idle` task has a non-configurable static priority of `0`, the lowest priority. `1`. The `idle` task has a non-configurable static priority of `0`, the lowest priority.
> A higher number means a higher priority in RTIC, which is the opposite from what > A higher number means a higher priority in RTIC, which is the opposite from what
> Cortex-M does in the NVIC peripheral. > Cortex-M does in the NVIC peripheral.
> Explicitly, this means that number `10` has a **higher** priority than number `9`. > Explicitly, this means that number `10` has a **higher** priority than number `9`.
When several tasks are ready to be executed the one with highest static When several tasks are ready to be executed the one with highest static