DFU example

[DeveloperZ]

Hi,

I am trying to implement the DFU example from Mesh 3.1.0SDK and 15.2.0 SDK. I am following the process mentioned here.

I am using a MacOS for development.

I am able to execute steps 1 through 9 successfully but when I execute step 10, it says:

command - nrfutil dfu serial -pkg dfu_test.zip -p usbmodem0006829949971 -b 115200 -fc --mesh

Upgrading target on usbmodem0006829949971 with DFU package /Users/xxx/xxx/xxx/xxx/dfu_test.zip. Flow control is enabled.

Failed to upgrade target. Error is: Serial port could not be opened on usbmodem0006829949971. Reason: 

Possible causes:

- bootloader, SoftDevice or application on target does not match the requirements in the DFU package.

- baud rate or flow control is not the same as in the target bootloader.

- target is not in DFU mode. If using the SDK examples, press Button 4 and RESET and release both to enter DFU mode.

I am guessing that the possible reason would be the third one i.e target isn't in the DFU mode. I am not completely sure.

What might be the reason for this dfu failure?

Thank you.

[AndreasF]

Hi.

The serial number is the "id number" on the Segger chip.

The serial number on this chip is 682266227.

 

DeveloperZ said:

Reading UICR.. Traceback (most recent call last):

  File "bootloader_verify.py", line 174, in <module>

    bootloader_addr = read_uicr(sys.argv[1])

  File "bootloader_verify.py", line 65, in read_uicr

    read = nrfjprog("-s " + serial_number + " --memrd 0x10001014 --n 4 --w 32").strip()

  File "bootloader_verify.py", line 52, in nrfjprog

    process = subprocess.Popen(shlex.split("nrfjprog " + args), stdout=subprocess.PIPE)

  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 390, in __init__

    errread, errwrite)

  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1024, in _execute_child

    raise child_exception

OSError: [Errno 2] No such file or directory

Which version of python are you using?

Best regards,

Andreas

[DeveloperZ]

AndreasF said:

Which version of python are you using?

I am using python 2.7.13

[AndreasF]

Hi.

And you have installed pySerial?

Best regards,

Andreas

[DeveloperZ]

Yes, I have installed Pyserial package for Python2.7

[AndreasF]

Hi.

Could you copy and paste the command you used when you called the bootloader_verify.py file?

Are you sure that it is the correct Python if you have both Python 2.7 and 3.5(++)?

Best regards,

Andreas