mirror/rtic
1
0
Fork 0
mirror of https://github.com/rtic-rs/rtic.git synced 2024-11-29 15:04:32 +01:00
Code Issues Projects Releases Packages Wiki Activity

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

Browse source
This commit is contained in:
Jorge Aparicio 2019-05-01 23:32:22 +02:00
parent 4df6292e1e
commit f5de8307b2
1 changed files with 9 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
macros/src/codegen.rs
View file

@ -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 // Set the cycle count to 0 and disable it while `init` executes
if cfg!(feature = "timer-queue") { 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.ctrl.modify(|r| r & !1);));
exprs.push(quote!(p.DWT.cyccnt.write(0);)); exprs.push(quote!(p.DWT.cyccnt.write(0);));
} }