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runtime/samd21: set minimum sleep to 214us due to minimum delay in register synchronization

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Signed-off-by: Ron Evans <ron@hybridgroup.com>
This commit is contained in:
Ron Evans
2019-09-17 19:26:52 +02:00
committed by Ayke
parent f5fd49bb74
commit 0a5601c3fc
1 changed files with 6 additions and 3 deletions
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src/runtime/runtime_atsamd21.go
+6 -3
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@@ -261,9 +261,12 @@ func ticks() timeUnit {
// ticks are in microseconds // ticks are in microseconds
func timerSleep(ticks uint32) { func timerSleep(ticks uint32) {
timerWakeup.Set(0) timerWakeup.Set(0)
if ticks < 30 { if ticks < 214 {
// have to have at least one clock count // due to around 183us delay waiting for the register value to sync, the minimum sleep value
ticks = 30 // for the SAMD21 is 214us.
// For related info, see:
// https://community.atmel.com/comment/2507091#comment-2507091
ticks = 214
} }
// request read of count // request read of count