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GErma.1
GErma.1
Associate III
April 30, 2023
Question

STM32G030K6T6 - Rtc with sub second

  • April 30, 2023
  • 3 replies
  • 1403 views

Hi

I would like to use the sub second information available in the rtc registers. Can some one give an exemple on how to use it correctly with HAL?

BR

Gilberto

This topic has been closed for replies.

3 replies

Peter BENSCH
Peter BENSCH
ST Technical Moderator
April 30, 2023

What do you want to do with the subseconds, or what do you expect from them?

Regards

/Peter

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GErma.1
GErma.1Author
Associate III
April 30, 2023

The processor is in STOP mode most of the time and is woken up by interrupts generated by the GPIOs. I want to measure the time between interrupts with an accuracy of less than 1 second. There is no LPTIM available in this PN. The only available time base is RTC.

BR

Gilberto

waclawek.jan
waclawek.jan
Super User
May 1, 2023

While the 'G0 does not appear to have the infamous "BYPSHAD=0 may not lock time/date properly" erratum, it's probably still more practical (read: faster = resulting in lower active-time power consumption) to use BYPSHAD=1 and the read-twice-and-repeat-if-not-match mechanism, see eg. EngyCZ's implementation here (in second part of that article).

JW

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