waking up from systemOFF resetting GPIO

RE: waking up from systemOFF resetting GPIO

buja — Wed, 28 Apr 2021 11:16:32 GMT

Okay, Thank you

RE: waking up from systemOFF resetting GPIO

Amanda Hsieh — Wed, 28 Apr 2021 11:15:46 GMT

Disconnect with the debugger.

-Amanda H.

RE: waking up from systemOFF resetting GPIO

buja — Wed, 28 Apr 2021 10:08:34 GMT

Hi Amanda,

Thank yoou for your reply.

How can we make sure the device is not in debug interface mode ? Is it by just disconnecting the debugger ?

RE: waking up from systemOFF resetting GPIO

Amanda Hsieh — Wed, 28 Apr 2021 06:51:34 GMT

Hi,

The NRF_GPIO peripheral should maintain configuration, however if you have peripheral (e.g. TWI, UART etc) controlling the pins, then during wakeup from system off it will fall back to the actual NRF_GPIO configuration. So make sure that before you go to sleep (system OFF) that you set NRF_GPIO pins to the state you want them to have when wakeup.

Also make sure you are not in debug mode during sleep, because of this errata:

[81] GPIO: PIN_CNF is not retained when in debug interface mode

-Amanda H.