Transferring 52832 PJT to 52840

[Avadacadabara]

Hi,

I've developed a PJT that works properly on nrf52832. Now I'm trying to migrate it to PCA10056 for USB developement.

Several attempts have been made but problem occurs more or less.

This project contains 2 spi, 1 twim, GPIOTEs and 1 ADC and 1 WDT.

I've tried to modify the project from origin 52832 PJT:

• change the option target device to 52840
• adjust the memory area start/size(referred from usbd_ble_uart)
• change preprocessor symbols to BOARD_PCA10056 , NRF52840_XXAA , S140 
• include path S132 folders to ..\..\..\..\..\..\components\softdevice\s140\headers and ..\..\..\..\..\..\components\softdevice\s140\headers\nrf

Based on the changes above, problems as follows:

• the watch dog timer seems cannot be fed
• one of the gpiotes cannot be triggered by an external interrupt signal
• something wrong with SPI instance 2

I also tried to add peripherals from usbd_ble_uart sample project but same problem occurred.

Did I miss any settings?

Thanks

[Avadacadabara]

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

[Jørgen Holmefjord]

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

[Avadacadabara]

Thanks Jorgen!

Didn't expect the pins are disconnected.

But I could customize these pins on DIY boards right?

[Jørgen Holmefjord]

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