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Merge #283

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283: Include DWT enable in migration guide r=korken89 a=MabezDev

Makes note of the fact the DWT has to be enabled manually in rtfm 0.5.0; an easy one to miss considering debuggers generally enable the DWT automatically.

Co-authored-by: Scott Mabin <scott@mabez.dev>
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bors[bot] 2019-12-03 16:15:26 +00:00 committed by GitHub
commit ffe4c07869
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10
book/en/src/migration.md
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@ -192,7 +192,9 @@ the `monotonic = rtfm::cyccnt::CYCCNT` argument to the `#[rtfm::app]` attribute.
Also, the `Duration` and `Instant` types and the `U32Ext` trait have been moved
into the `rtfm::cyccnt` module. This module is only available on ARMv7-M+
devices.
devices. The removal of the `timer-queue` also brings back the `DWT` peripheral
inside the core peripherals struct, this will need to be enabled by the application
inside `init`.
Change this:
@ -217,6 +219,12 @@ use rtfm::cyccnt::{Duration, Instant, U32Ext};
#[rtfm::app(/* .. */, monotonic = rtfm::cyccnt::CYCCNT)]
// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
const APP: () = {
#[init]
fn init(cx: init::Context) {
cx.core.DWT.enable_cycle_counter();
// optional, configure the DWT run without a debugger connected
cx.core.DCB.enable_trace();
}
#[task(schedule = [b])]
fn a(cx: a::Context) {
// ..