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device path must be absolute; clarify

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This commit is contained in:
Daniel Carosone 2020-10-13 10:45:03 +11:00
parent b8665a2f31
commit efe6b516fb
2 changed files with 25 additions and 6 deletions
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13
book/en/src/by-example/app.md
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@ -7,11 +7,14 @@ This is the smallest possible RTIC application:
```
All RTIC applications use the [`app`] attribute (`#[app(..)]`). This attribute
must be applied to a `mod`-item. The `app` attribute has
a mandatory `device` argument that takes a *path* as a value. This path must
point to a *peripheral access crate* (PAC) generated using [`svd2rust`]
**v0.14.x** or newer. The `app` attribute will expand into a suitable entry
point so it's not required to use the [`cortex_m_rt::entry`] attribute.
must be applied to a `mod`-item. The `app` attribute has a mandatory `device`
argument that takes a *path* as a value. This must be a full path pointing to a
*peripheral access crate* (PAC) generated using [`svd2rust`] **v0.14.x** or
newer. More details can be found in the [Starting a new project](./new.md)
section.
The `app` attribute will expand into a suitable entry point so it's not required
to use the [`cortex_m_rt::entry`] attribute.
[`app`]: ../../../api/cortex_m_rtic_macros/attr.app.html
[`svd2rust`]: https://crates.io/crates/svd2rust

18
book/en/src/by-example/new.md
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@ -52,7 +52,23 @@ $ curl \
> src/main.rs
```
That example depends on the `panic-semihosting` crate:
The `init` example uses the `lm3s6965` device. Remember to adjust the `device`
argument in the app macro attribute to match the path of your PAC crate, if
different, and add peripherals or other arguments if needed. Although aliases
can be used, this needs to be a full path (from the crate root). For many
devices, it is common for the HAL implementation crate (aliased as `hal`) or
Board Support crate to re-export the PAC as `pac`, leading to a pattern similar
to the below:
```rust
use abcd123_hal as hal;
//...
#[rtic::app(device = crate::hal::pac, peripherals = true, monotonic = rtic::cyccnt::CYCCNT)]
mod app { /*...*/ }
```
The `init` example also depends on the `panic-semihosting` crate:
``` console
$ cargo add panic-semihosting