Deep sleep mode with nrf52840

RE: Deep sleep mode with nrf52840

Judge — Wed, 26 Aug 2020 09:27:39 GMT

Hi,

I appreciate this help. Nearly all of my problems have been resolved.

Best regards.

RE: Deep sleep mode with nrf52840

Simonr — Tue, 25 Aug 2020 13:12:59 GMT

From SYSTEM OFF mode, you can use the Low Power Comparator to sample an analog voltage value with the comparator and wake up after passing a certain threshold. You can see the LPCOMP peripheral example for information on how to use the LPCOMP, but you'll have to implement this in your sleep routine.

Best regards,

Simon

RE: Deep sleep mode with nrf52840

Judge — Tue, 25 Aug 2020 10:32:07 GMT

Hi,

Thanks for your help.
I have one more question: as you said you can use LPCOMP to wake up the node, do you have any examples for this idea?

RE: Deep sleep mode with nrf52840

Simonr — Mon, 24 Aug 2020 07:37:52 GMT

Have you checked out the friendship configuration defines on the Infocenter and the attached documentation? The low power node will have to initiate and accept the friend connection when initially configuring the LPN and friend node.

Best regards,

Simon

RE: Deep sleep mode with nrf52840

Judge — Mon, 24 Aug 2020 01:48:37 GMT

hi,

thanks for answer Simonr,

But

I tried using lpn but I had problems setting up friendship. I have read in inforcenter, do I know when setting up the friendship app I will have to call mesh_lpn_friend_accept () before timeout but I don't understand how it will send?

RE: Deep sleep mode with nrf52840

Simonr — Fri, 21 Aug 2020 11:06:22 GMT

1. When the nRF is in system_OFF mode, the only ways to wake it up will be to either trigger a reset or to use the Low power comparator (LPCOMP) to trigger a wake-up. You won't be able to use any internal timer or sensor to trigger this reset, as the CPU is turned off, but an external sensor should be able to trigger a reset on the nRF, which will wake it up from system OFF mode.

2. I assume you're referring to the friend node functionality in the Bluetooth Mesh specification here? You can check out the Mesh SDK documentation over on the Infocenter, and specifically the "Integrating Low Power node feature" to see how you can handle and set up friend nodes.

Best regards,

Simon