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Update app.md

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KENTARO OKUDA 2020-05-13 07:35:51 -04:00
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8
book/en/src/by-example/app.md
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@ -106,7 +106,7 @@ mut` variables are safe to use within a hardware task.
$ cargo run --example hardware
{{#include ../../../../ci/expected/hardware.run}}```
So far all the RTFM applications we have seen look no different that the
So far all the RTFM applications we have seen look no different than the
applications one can write using only the `cortex-m-rt` crate. From this point
we start introducing features unique to RTFM.
@ -115,7 +115,7 @@ we start introducing features unique to RTFM.
The static priority of each handler can be declared in the `task` attribute
using the `priority` argument. Tasks can have priorities in the range `1..=(1 <<
NVIC_PRIO_BITS)` where `NVIC_PRIO_BITS` is a constant defined in the `device`
crate. When the `priority` argument is omitted the priority is assumed to be
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.
@ -140,12 +140,12 @@ $ cargo run --example preempt
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`
task, `gpiob` is prioritized over `gpioa` 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
limitations in the language the error message is currently far from helpful: it
limitations in the language, the error message is currently far from helpful: it
will say something along the lines of "evaluation of constant value failed" and
the span of the error will *not* point out to the problematic interrupt value --
we are sorry about this!