nRF52805 can't enter into sleep mode

RE: nRF52805 can't enter into sleep mode

ticture — Fri, 08 Jan 2021 12:59:36 GMT

ok, I will try it these days, thank you very much

RE: nRF52805 can't enter into sleep mode

Susheel Nuguru — Thu, 07 Jan 2021 08:46:38 GMT

It looks like you are using pca10040.h board files to your chip. You need to map your wakeup source/button gopi number correctly.

RE: nRF52805 can't enter into sleep mode

Susheel Nuguru — Thu, 07 Jan 2021 08:35:59 GMT

The reset happens when your chip wakes up from the system off sleep. Seems like you are configuring the wrong GPIO pin number as the wakeup button source. Which board file are you using in your project from the nRF52805_sleep_main\components\boards directory. I think the button connected on your board is connected to a different GPIO than the board you included causing a wrong wakeup source for your chip. which in turn is waking your chip immediately after going to sleep which causes a system reset.

RE: nRF52805 can't enter into sleep mode

ticture — Wed, 06 Jan 2021 14:45:49 GMT

Thanks for your help, I replace the last APP_ERROR_CHECK(err_code); with while(1);

and add the sleep_mode_enter(); to the main().

However it still doesn't work, the device automatically reset after enter into sleep mode.

RE: nRF52805 can't enter into sleep mode

Susheel Nuguru — Wed, 06 Jan 2021 14:11:17 GMT

I have the nRF52805 device now and I see what you see in the debugger.

This code will fail in the debugger, since sd_power_system_off will return with error in debug mode. In debugger mode, the systemoff is emulated and I think instead of APP_ERROR_CHECK, you should have a while(1); here. The error is expected and a correct behavior, but i can see that it causes some confusion.

I recommend you to replace the last APP_ERROR_CHECK(err_code); with while(1);

RE: nRF52805 can't enter into sleep mode

Susheel Nuguru — Wed, 06 Jan 2021 12:41:36 GMT

This seems to be an APP_ERROR_CHECK failure, please look into the call stack to see which check failed. I do not have a nRF52805 board and tried to run your code on nRF52832 DK, but i cannot replicate the problem.