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book: Update default priority to 0

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Nils Fitinghoff 2023-08-29 09:28:43 +02:00 committed by Emil Fresk
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2
book/en/src/by-example/app.md
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@ -32,7 +32,7 @@ Overall, the generated code infers no additional overhead in comparison to a han
## Priority ## Priority
Priorities in RTIC are specified using the `priority = N` (where N is a positive number) argument passed to the `#[task]` attribute. All `#[task]`s can have a priority. If the priority of a task is not specified, it is set to the default value of 1. Priorities in RTIC are specified using the `priority = N` (where N is a positive number) argument passed to the `#[task]` attribute. All `#[task]`s can have a priority. If the priority of a task is not specified, it is set to the default value of 0.
Priorities in RTIC follow a higher value = more important scheme. For examples, a task with priority 2 will preempt a task with priority 1. Priorities in RTIC follow a higher value = more important scheme. For examples, a task with priority 2 will preempt a task with priority 1.

4
book/en/src/by-example/app_priorities.md
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@ -4,9 +4,9 @@
The `priority` argument declares the static priority of each `task`. The `priority` argument declares the static priority of each `task`.
For Cortex-M, tasks can have priorities in the range `1..=(1 << NVIC_PRIO_BITS)` where `NVIC_PRIO_BITS` is a constant defined in the `device` crate. For Cortex-M, tasks can have priorities in the range `0..=(1 << NVIC_PRIO_BITS)` where `NVIC_PRIO_BITS` is a constant defined in the `device` crate.
Omitting the `priority` argument the task priority defaults to `1`. The `idle` task has a non-configurable static priority of `0`, the lowest priority. Omitting the `priority` argument the task priority defaults to `0`. 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.

2
book/en/src/by-example/software_tasks.md
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@ -35,7 +35,7 @@ $ cargo run --target thumbv7m-none-eabi --example spawn
``` ```
You may `spawn` a *software* task again, given that it has run-to-completion (returned). You may `spawn` a *software* task again, given that it has run-to-completion (returned).
In the below example, we `spawn` the *software* task `foo` from the `idle` task. Since the default priority of the *software* task is 1 (higher than `idle`), the dispatcher will execute `foo` (preempting `idle`). Since `foo` runs-to-completion. It is ok to `spawn` the `foo` task again. In the below example, we `spawn` the *software* task `foo` from the `idle` task. Since the priority of the *software* task is 1 (higher than `idle`), the dispatcher will execute `foo` (preempting `idle`). Since `foo` runs-to-completion. It is ok to `spawn` the `foo` task again.
Technically the async executor will `poll` the `foo` *future* which in this case leaves the *future* in a *completed* state. Technically the async executor will `poll` the `foo` *future* which in this case leaves the *future* in a *completed* state.