Dear Nordic,
I just started with nrf52840 DK and my custom board. I derived my custom_board.h from nRF5_SDK_15.0.0_a53641a/components/boards/pca10056.h. I need to reroute the DFU bootloader serial pins and since my custom board does not have CTS/RTS pins I have to disable hw flow control.
This seemed to be quite easy, I just redefined
#define RX_PIN_NUMBER myRx
#define TX_PIN_NUMBER myTx
and
#define HWFC false // was true on pca10056.h
For bootloading I used the option -fc 0:
nrfutil dfu serial -pkg mypacket.zip -p /dev/mydevice -b 115200 -fc 0
Unfortunately DFU serial bootloading did not work on my custom board, I always got
No ping response after opening COM port
Finally I found the problem. The define HWFC is actually not used at all by the bootloader source. Instead I had to alter the sdk-config option NRF_DFU_SERIAL_UART_USES_HWFC from 1 to 0.
Now everything works as expected.
Would you please remove the unused define HWFC from the original board headers (e.g. pca10056.h). This is really confusing. Best would be a comment in pca10056.h what to do when to disable hw flow control.
I just started with the SDK and found them really well written, documented, powerful tools and easy to use. Good work though!
regards
spachner
