Transferring 52832 PJT to 52840

RE: Transferring 52832 PJT to 52840

Jørgen Holmefjord — Fri, 28 May 2021 07:54:53 GMT

Yes, if you cut/solder the solder bridges as described in the linked page, the pins can be repurposed for other uses.

RE: Transferring 52832 PJT to 52840

Avadacadabara — Fri, 28 May 2021 01:32:22 GMT

Thanks Jorgen!

Didn't expect the pins are disconnected.

But I could customize these pins on DIY boards right?

RE: Transferring 52832 PJT to 52840

Jørgen Holmefjord — Thu, 27 May 2021 12:25:06 GMT

Hi,

All the pins you mention are (potentially) used by other modules on the nRF52840 DK:

P0.05 is used as RTS pin for the UART interface to the interface MCU's Virtual COM port
P0.10 is one of the NFC tag antenna pins
P0.21-P0.22 are part of the interface to the External memory QSPI flash chip. These pins are by default disconnected from the pin headers on the DK.

Best regards,
Jørgen

RE: Transferring 52832 PJT to 52840

Avadacadabara — Thu, 27 May 2021 02:38:13 GMT

I switched peripheral pin ports and it works well.

But I'm still confused why previous pins won't work...P0.05 to P0.10, P0.21 and P0.22 can be used as GPIO according to datasheet(did these pins involved in extra circuit on DK? Cause I already avoided GPIOs who have been commited as buttons DK such as P0.11, P0.25).

Thanks

RE: Transferring 52832 PJT to 52840

Avadacadabara — Mon, 24 May 2021 10:45:16 GMT

Additionally, I integrate WDT with BLE and USB. The USB COM cannot be detected until USB data start transferring, then the BLE can be connected without being reset by watchdog. On the other hand, if I just do USB_init and don"t output any data from USB, then the system will reset after 2S(WDT timeout)...