how to extend RTC2 wakeup interval time on nrf24le1

[Kevin]

Hi All, Is there any way to extend RTC2 wakeup interval time more than 2s ? we know that the maximum interval time of RTC2 on LE1 is 2s, i want to keep LE1 power donw to 30s or more without MCU wakingup, thus would save more energy. really appreciate if anyone could help, thanks!

[Hung Bui]

Hi Kevin,

No, the limit is 2 seconds. I don't think there is any other way than letting the MCU wake up, count and then sleep again until it meet the 30 second timing. Note that it will be a very short period of time that the CPU wake up , increase a counter variable and sleep again, so the power consumption is not very significant.

[Kevin]

Hi Bui,

Thank you so much for the help!

i have added one global varible into TICK interrupt, each time MCU enterred interrupt it will be increased and and after 15 times (30s) put off RTC to process application, once done put RTC on again, it works for me

Thanks a lot!

Kevin