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chips: apollo3: Allow a few tries to set the stimer #1988

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Jul 7, 2020
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chips: apollo3: Allow a few tries to set the stimer #1988

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11 changes: 9 additions & 2 deletions chips/apollo3/src/stimer.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -133,8 +133,15 @@ impl<'a> hil::time::Alarm<'a> for STimer<'a> {
// Enable interrupts
regs.stminten.modify(STMINT::COMPAREA::SET);

// Set the delta
regs.scmpr[0].set(tics - regs.sttmr.get());
// Set the delta, this can take a few goes
// See Errata 4.14 at at https://ambiqmicro.com/static/mcu/files/Apollo3_Blue_MCU_Errata_List_v2_0.pdf
let timer_delta = tics - regs.sttmr.get();
let mut tries = 0;

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while regs.scmpr[0].get() != tics && tries < 5 {
regs.scmpr[0].set(timer_delta);
tries = tries + 1;
}

// Enable the compare
regs.stcfg.modify(STCFG::COMPARE_A_EN::SET);
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