nRF52 RTC to wake up time

RE: nRF52 RTC to wake up time

Jared — Tue, 05 Mar 2019 12:00:25 GMT

Hi,

You could use PPI and connect it to an RTC Compare event, and then set the TASK as a start SPI TASKS_START. The operation should use 1 µs to start the transmission once the TASK is triggered, and 0.0625 µs to a PPI event from low power mode. So a total of 1.0625 µs.

Best regards

Jared

RE: nRF52 RTC to wake up time

Niall — Mon, 04 Mar 2019 12:34:34 GMT

Hi, thanks for the response. Unfortunately this isn't an option for me because the ADC I am using must be triggered (and configured) each time the system wakes.

RE: nRF52 RTC to wake up time

Niall — Mon, 04 Mar 2019 12:34:01 GMT

Hi, thanks for the response. Unfortunately this isn't an option for me because the ADC I am using must be triggered (and configured) each time the system wakes.

RE: nRF52 RTC to wake up time

hobby16 — Thu, 28 Feb 2019 20:52:45 GMT

Use SPI interrupt to wake up instead of RTC interrupt.

Better, use the SPI's DMA to store incoming data in RAM (no CPU usage needed so even more power saving) and wake up only when the RAM buffer zone is full.