Sleep until WDT timesout

[rshankle]

Hi All,

I have up to 8 nRF52832 devices sending data back to a base unit (another nRF52832 device.)   What I'm trying to do is have the remote units wakeup at a given time,

read sensors and send message back to the base unit.  (Each remote has a unique ID that the base unit tracks the data by.)

Currently I'm using a watchdog timer to bring the device out of sleep mode (reboot and read nvram to reload system state.)

I've been trying to use:

while(1)

{

__WFE();

}

To put the device asleep, but I'm thinking the devices are waking each other up.  (I'm getting more updates than expected and battery life is lower than expected.)

Is there a better way to get the unit to stay asleep?

thanks,

Bob

[rshankle]

We don't have the luxury of having something external running to wake up the nRF52832 device.  We need the device to wake itself up.  

[Susheel Nuguru]

Then systemoff will not suit you. That is, you won't be able to go to deepest sleep mode if any external sensor/input is not involved.

RTC is your good bet, it will run on LFCLK and the example you can see in SDK15.3\examples\peripheral\rtc\main.c

[rshankle]

thanks for all the help.

I appreciate it.

Bob