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unlock the DWT, if locked, when using the timer queue

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Jorge Aparicio 2019-05-01 23:32:22 +02:00
parent 4df6292e1e
commit f5de8307b2
1 changed files with 9 additions and 0 deletions
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9
macros/src/codegen.rs
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@ -2024,6 +2024,15 @@ fn pre_init(ctxt: &Context, app: &App, analysis: &Analysis) -> proc_macro2::Toke
// Set the cycle count to 0 and disable it while `init` executes
if cfg!(feature = "timer-queue") {
exprs.push(quote!(
// unlock the DWT, if software locked
// See ARM CoreSight Architecture Specification v3.0, section B2.3.10
// 1 << 0 = Software lock mechanism is implemented.
// 1 << 1 = Writing to the other registers in the component is blocked
if p.DWT.lsr.read() & 0b11 == 0b11 {
p.DWT.lar.write(0xC5ACCE55);
}
));
exprs.push(quote!(p.DWT.ctrl.modify(|r| r & !1);));
exprs.push(quote!(p.DWT.cyccnt.write(0);));
}