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machine/stm32f103xx: correct convertion for fractional timing of RTC as used in ticks() function

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Signed-off-by: Ron Evans <ron@hybridgroup.com>
This commit is contained in:
Ron Evans
2019-03-08 17:27:49 +01:00
committed by Ayke
parent 622d0ebde6
commit 09e85b7859
1 changed files with 2 additions and 2 deletions
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src/runtime/runtime_stm32f103xx.go
+2 -2
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@@ -124,8 +124,8 @@ func ticks() timeUnit {
// convert RTC counter from seconds to microseconds
timerCounter := uint64(stm32.RTC.CNTH<<16|stm32.RTC.CNTL) * 1000 * 1000
// add the fractional part of current time using DIV registers
timerCounter += (uint64(stm32.RTC.DIVH<<16|stm32.RTC.DIVL) / 1024 * 32 * 32) * 1000 * 1000
// add the fractional part of current time using DIV register
timerCounter += uint64(0x8000-stm32.RTC.DIVL) * 31
// change since last measurement
offset := (timerCounter - timerLastCounter)