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v0.2.2

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Jorge Aparicio 2017-11-22 09:27:14 +01:00
parent c184f91e3c
commit 948e1fd0fb
10 changed files with 161 additions and 61 deletions
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32
examples/late-resources.rs
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@ -16,19 +16,21 @@ app! {
// Usually, resources are initialized with a constant initializer:
static ON: bool = false;
// However, there are cases where this is not possible or not desired. For example, there
// may not be a sensible value to use, or the type may not be constructible in a constant
// (like `Vec`).
// While it is possible to use an `Option` in some cases, that requires you to properly
// initialize it and `.unwrap()` it at every use. It also consumes more memory.
// However, there are cases where this is not possible or not desired.
// For example, there may not be a sensible value to use, or the type may
// not be constructible in a constant (like `Vec`).
//
// To solve this, it is possible to defer initialization of resources to `init` by omitting
// the initializer. Doing that will require `init` to return the values of all "late"
// resources.
// While it is possible to use an `Option` in some cases, that requires
// you to properly initialize it and `.unwrap()` it at every use. It
// also consumes more memory.
//
// To solve this, it is possible to defer initialization of resources to
// `init` by omitting the initializer. Doing that will require `init` to
// return the values of all "late" resources.
static IP_ADDRESS: u32;
// PORT is used by 2 tasks, making it a shared resource. This just tests another internal
// code path and is not important for the example.
// PORT is used by 2 tasks, making it a shared resource. This just tests
// another internal code path and is not important for the example.
static PORT: u16;
},
@ -54,22 +56,24 @@ app! {
// The signature of `init` is now required to have a specific return type.
fn init(_p: init::Peripherals, _r: init::Resources) -> init::LateResourceValues {
// `init::Resources` does not contain `IP_ADDRESS`, since it is not yet initialized.
// `init::Resources` does not contain `IP_ADDRESS`, since it is not yet
// initialized.
//_r.IP_ADDRESS; // doesn't compile
// ...obtain value for IP_ADDRESS from EEPROM/DHCP...
let ip_address = 0x7f000001;
init::LateResourceValues {
// This struct will contain fields for all resources with omitted initializers.
// This struct will contain fields for all resources with omitted
// initializers.
IP_ADDRESS: ip_address,
PORT: 0,
}
}
fn sys_tick(_t: &mut Threshold, r: SYS_TICK::Resources) {
// Other tasks can access late resources like any other, since they are guaranteed to be
// initialized when tasks are run.
// Other tasks can access late resources like any other, since they are
// guaranteed to be initialized when tasks are run.
r.IP_ADDRESS;
}