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book: Add link to new.md

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book/en/src/by-example/app.md
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@ -6,32 +6,6 @@ This is the smallest possible RTIC application:
{{#include ../../../../examples/smallest.rs}}
```
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 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
[`cortex_m_rt::entry`]: ../../../api/cortex_m_rt_macros/attr.entry.html
## `init`
Within the `app` module the attribute expects to find an initialization
function marked with the `init` attribute. This function must have
signature `fn(init::Context) -> (init::LateResources, init::Monotonics)`.
This initialization function will be the first part of the application to run.
The `init` function will run *with interrupts disabled* and has exclusive access
to Cortex-M where the `bare_metal::CriticalSection` token is available as `cs`.
And optionally, device specific peripherals through the `core` and `device` fields
of `init::Context`.
`static mut` variables declared at the beginning of `init` will be transformed
into `&'static mut` references that are safe to access. Notice, this feature may be deprecated in next release, see `task_local` resources.
@ -57,6 +31,7 @@ $ cargo run --example init
> triple to cargo (e.g `cargo run --example init --target thumbv7m-none-eabi`) or
> configure a device to be used by default when building the examples in `.cargo/config.toml`.
> In this case, we use a Cortex M3 emulated in QEMU so the target is `thumbv7m-none-eabi`.
> See [`Starting a new project`](./new.md) for more info.
## `idle`