nrf52840 bootloader(UART)+Buttonless+s140_nrf52_7.2.0_softdevice.hex cannot work

[john.liu]

Hi:

Use sdk nRF5_SDK_17.1.0_ddde560, Borad PCA10056

1,

Bootloader(pca10056_uart_debug)+App(ble_app_buttonless_dfu)+s140_nrf52_7.2.0_softdevice.hex cann't work.

2,

Bootloader(pca10056_s140_ble_debug)+App(ble_app_buttonless_dfu)+s140_nrf52_7.2.0_softdevice.hex It can work.

Attachments include dfu_public_key.c and private.pem, etc...

uart_dfu.zip

[john.liu]

My serial port com5 cannot be used."Serial port could not be opened on COM5. Reason: None".

PCA10056 serial port com8 can be use,"No ping response after opening COM port".

[Edvin]

Can you please explain what is connected to COM5? Is it the other USB cable on the DK, or is it an external UART to USB device? Or did you plug the TX and RX pin of the DK directly into your computer (Of course I understand that you didn't, but I want to emphasize what I do not understand).

Perhaps you can show me a photo of what you have connected between the DK and the computer? If you are using the other USB port on the DK, that will not work, because that is not connected to the UART. 

Best regards,

Edvin

[john.liu]

I try to use the COM5 connection PIN30/31 for DFU.

Like this:

[Edvin]

Have you successfully been able to use this UART device (the USB dongle plugged into COM5 with UART previously in another application?

Since it only says that it is not able to open the COM port, it sounds like it is not really an nRF issue. Are you sure that this 3rd party module is working correctly? Are you sure that COM5 is not opened in any other application?

BR,
Edvin