serail dfu without flow control for nrfutil 6.1.3

[William.wei]

hi support team,

customer have one question about nrf dfu with serial:" how to disable flow control for 2 wire uart".

previously we have one ticket :"https://devzone.nordicsemi.com/f/nordic-q-a/28077/sdk-13-0-0-secure-serial-dfu-without-flow-control" that works fine for previous nrfutil version, and now i found that  there is no such file named "nordicsemi\dfu\dfu_transport_serial.py" in python3.9;

and how can i close the flow control?

Thanks in advance!

Regards,

William.

[Hung Bui]

Hi Leiping, 

If you want to modify nrfutil, it's required to re-compile the library from source to use.
Pleas follow the instruction here.

[William.wei]

Hi Hung,

Thanks.

i have see into the code and find out that it is using default flow control as below:

so does it mean that i need to add parameter to nrfutil command? i can see -fc 

so the command for the nrfutil should be as "nrfutil dfu serial -fc 0 -pkg uart_nrf_dfu_ext.zip -p COM187 -b 115200", is it correct?

or maybe i was wrong, the default flow control is 0?

nrfutil dfu serial -fc 0 -pkg uart_nrf_dfu_ext.zip -p COM187 -b 115200     equals to 

nrfutil dfu serial  -pkg uart_nrf_dfu_ext.zip -p COM187 -b 115200

Regards,
William.

[Hung Bui]

Hi William, 

Sorry I forgot that there is an option to configure flow control. By default flow control is on. 
You can find that     DEFAULT_FLOW_CONTROL = True in dfu_transport_serial.py

So 

nrfutil dfu serial -fc 1 -pkg uart_nrf_dfu_ext.zip -p COM187 -b 115200     equals to 

nrfutil dfu serial  -pkg uart_nrf_dfu_ext.zip -p COM187 -b 115200

[William.wei]

hi Hung,

Thanks for your instructions,

i have tested it and confirmed, with -fc 0 it is working now.

Regards,

William.