RE: nRF52 reset issue

deknoob — Sat, 14 Nov 2020 02:26:12 GMT

Hi Jared,

I've fixed the issue, it was in fact caused by combination of two bugs:

PCB silkscreen wrongly indicates reset button, but in fact it is another button connected to P0.11 - same pin on DK is connected to BLE button 1. Function of BLE Button 1 is to force application to sleep and also to wakeup application from sleep (with reset on wakeup) - exactly what I was experiencing. First button push forces app to system off, second push causes reset and LED blink. What a coincidence.
There seem to be a bug in SDK, because BSP_BTN_BLE_ENABLED 0 has no effect. This bug was also reported in this post devzone.nordicsemi.com/.../134605

Regards

Kerim

RE: nRF52 reset issue

Jared — Fri, 13 Nov 2020 13:58:22 GMT

Hi,

[quote user=""]My board has only reset button connected to reset input and 10K pull-up resistor.[/quote]

Could you share the schematic instead, it's easier to understand how exactly that you've connected it.

What happens if you pull the reset pin by connecting it directly to GND with a wire? How long are you pressing the button when you try to reset it the first time, is behavior dependent on how long you push the button?

regards

Jared