DFU over serial UART

RE: DFU over serial UART

Hung Bui — Fri, 12 Mar 2021 15:23:00 GMT

Hi,
You would need to solve the UART connectivity issue before testing with DFU.
On the DK you may want to flash an application that set the pins to INPUT, disconnect buffer. It's equivalent to high impedance mode. You set this so that it would not interfere with the communication between the PC and the custom board.
Next you would need to use a logic analyzer to check if the signal on the UART pins are as expected.
Please take a photo of your set-up.

RE: DFU over serial UART

amarin — Wed, 10 Mar 2021 17:00:49 GMT

Sorry for not answering the question, but I did connect the board via the DK and have the DK connect to the PC, however, the custom board does not communicate with the PC. I did flash a slightly modified version of the serial_pca10056 example to the custom board and it is transmitting data, however it does not read anything from the PC when it should be reading any key I push on the PC.

RE: DFU over serial UART

Hung Bui — Wed, 10 Mar 2021 10:49:51 GMT

Hi Amarin,

Please answer this question:

[quote user="hungbui"]Have you tried to connect the DK to PC and the custom board to the DK and then can use UART on the custom board to communicate with PC ? [/quote]

Please test flashing a simple code that use UART on the custom board to test if it can communicate with PC (with the DK in the middle)

RE: DFU over serial UART

amarin — Tue, 09 Mar 2021 22:23:47 GMT

The custom board does not have a connection that can directly connect to the PC. The only way it can be programmed is through the debugger or through it's UART pins. I have tried connecting it directly to the DK and having the DK connect to the PC which results in the error above.

I have configured the bootloader to the custom board and was able to flash the bootloader on to the custom board via the debugger.

RE: DFU over serial UART

Hung Bui — Tue, 09 Mar 2021 11:03:12 GMT

Hi,
Have you tried to connect the DK to PC and the custom board to the DK and then can use UART on the custom board to communicate with PC ?

Please make sure you erase any application on the DK. Don't flash the bootloader on the DK.

The error telling that the custom board doesn't response to the ping command from the PC. Have you flashed the bootloader on the custom board and configured the GPIO pins for UART correctly on the bootloader firmware ?

RE: DFU over serial UART

amarin — Mon, 08 Mar 2021 17:17:00 GMT

I did not connect ground to both devices and thus why I got the error. However I am now getting the following error:

I had done the previous serial examples on my SDK, and they work just fine. However, when I am trying to do a dfu over the uart with the custom board, and it still does not work.

RE: DFU over serial UART

Hung Bui — Mon, 08 Mar 2021 13:49:27 GMT

Hi Amarin,

I would suggest to test the setup with some simple UART example code before you test with DFU. I would suggest to try testing with the UART loop back example in the SDK.

Have you made sure you connect ground on 2 boards nRF52 DK and the custom board ?

The info from the log telling that it couldn't open COM port 3, you may want to double check if it's the actual COM port of the DK.