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fix preempt example

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Jorge Aparicio 2019-08-21 10:53:13 +02:00
parent 69729d78eb
commit 7ca5bbf404
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8
book/en/src/by-example/app.md
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@ -138,10 +138,10 @@ The following example showcases the priority based scheduling of tasks.
$ cargo run --example interrupt
{{#include ../../../../ci/expected/preempt.run}}```
Note that the task `uart1` does *not* preempt task `uart2` because its priority
is the *same* as `uart2`'s. However, once `uart2` terminates the execution of
task `uart1` is prioritized over `uart0`'s due to its higher priority. `uart0`
is resumed only after `uart1` terminates.
Note that the task `gpiob` does *not* preempt task `gpioc` because its priority
is the *same* as `gpioc`'s. However, once `gpioc` terminates the execution of
task `gpiob` is prioritized over `gpioa`'s due to its higher priority. `gpioa`
is resumed only after `gpiob` terminates.
One more note about priorities: choosing a priority higher than what the device
supports (that is `1 << NVIC_PRIO_BITS`) will result in a compile error. Due to