Programming with pynrfjprog

[Michael Allan]

Hi,

I have a python scipt that uses pynrfjprog to program some custom information into a board's flash to be used by my application (calibration parameters, serial number etc).

I'd like to customise this to also program the softdevice, application and bootloader. nrfjprog can do this using the command:

nrfjprog.exe --eraseall --programs softdevice.hex --program application.hex bootloader.hex --verify --reset

Is there a way to access this functionality from the Python API?

[Michael Dietz]

Yes there is. There is an examples folder when you install pynrfjprog here C:\Python27\Lib\site-packages\pynrfjprog\examples

program_multiple_hex_file.py does this for you and should work out of the box. I attached it as well.program_multiple_hex_files.py

[Michael Allan]

Not quite:

C:\>nrfjprog -v
nrfjprog Version: 5.2.0.45203

C:\nrfjprog --help
<<snip>>
     --programs <hex_file> [--dfu]                Programs the specified hex
                         into the device. In addition, checks that the
                         hex file is a well constructed SoftDevice:
                         It contains a the FWID either in the UICR or
                         the SoftDevice itself, it contains a valid
                         value for the length of the SoftDevice, does
                         not contain any data above the afore mentioned
                         length, and only writes into SoftDevice
                         reserved space in UICR. Can be combined with
                         the erase operations, the reset operations and
                         the other programming operations. If dfu option
                         is given and the SoftDevice allows it, the
                         device will not be run time protected. otherwise,
                         the UICR.CLENR0 will be written. It will
                         automatically disable the MPU NVM protection
                         regions if enabled and enable it again after the
                         program operation.

I've read that the --dfu flag is needed to enable DFU update of the SoftDevice?