Regarding errata 179, notes on nRF5_SDK

[hiroiwas]

Hello.

Is the following understanding on the nRF5_SDK correct for this errata issue?

• Application Timer does not address this errata. (No problem unless you use app_timer_cnt_get.)
  
  
• app_timer is driven by the RTC COMPARE event, so app_timer_cnt_get() should not be done outside the event handler while app_timer is running.
  Because it follows the following explanation described in workaround.
  - Do not access the RTC registers, including the COMPARE event register, from CPU while waiting for the RTC COMPARE event.
  
  
• In SoC resources, RTC0 is used as SD and RTC1 is used as default app_timer.
  Therefore, RTC2 is free.
  To call app_timer_cnt_get() asynchronously, separate channels for SD, app_timer and RTC.

best regards.

[Vidar Berg]

Hello,

This errata applies only when you use the RTC with PPI, so the app timer library is not affected. 

Best regards,

Vidar

[hiroiwas]

Hello again, Vidor.

I overlooked that it occurs via PPI written in Symptoms.

Thank you for pointing that out.