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runtime/esp32s3: wait for TIMG0 update register to clear before reading timer registers

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This commit is contained in:
Joel Wetzell
2026-04-21 12:55:57 -05:00
committed by Ron Evans
parent 1f114b2acf
commit cf5912412d
1 changed files with 4 additions and 1 deletions
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src/runtime/runtime_esp32sx.go
+4 -1
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@@ -58,7 +58,10 @@ func initTimer() {
func ticks() timeUnit { func ticks() timeUnit {
// First, update the LO and HI register pair by writing any value to the // First, update the LO and HI register pair by writing any value to the
// register. This allows reading the pair atomically. // register. This allows reading the pair atomically.
esp.TIMG0.T0UPDATE.Set(0) esp.TIMG0.T0UPDATE.Set(1)
for esp.TIMG0.T0UPDATE.Get() != 0 {
// Register is cleared when the update is complete.
}
// Then read the two 32-bit parts of the timer. // Then read the two 32-bit parts of the timer.
return timeUnit(uint64(esp.TIMG0.T0LO.Get()) | uint64(esp.TIMG0.T0HI.Get())<<32) return timeUnit(uint64(esp.TIMG0.T0LO.Get()) | uint64(esp.TIMG0.T0HI.Get())<<32)
} }