RE: Requesting help using nRF52840 RTC Compare to generate SAADC TASKS_SAMPLE using PPI to workaround Errata 179

craig.goldman — Tue, 17 Jul 2018 14:30:55 GMT

Thank you for your response, but I don't understand your comment "that it is safe to access the RTC registers as long as you're done before the COMPARE match event triggers." In my application, the compare event is periodic because I modify the RTC_COMPARE register so a new event will trigger in several hundred microseconds.

Unless you mean to tell me that it is safe to modify the register before the FIRST compare match event, but after that the event will trigger twice.

I take it there are no further suggested workarounds.

RE: Requesting help using nRF52840 RTC Compare to generate SAADC TASKS_SAMPLE using PPI to workaround Errata 179

haakonsh — Tue, 17 Jul 2018 12:28:25 GMT

As I interpret the errata, any access R/W to any of the RTC registers while the RTC triggers the COMPARE match event will trigger it twice. I also interpret it to mean that it is safe to access the RTC registers as long as you're done before the COMPARE match event triggers.