Read and write specific flash pages from a computer

RE: Read and write specific flash pages from a computer

rct42 — Wed, 22 Nov 2017 00:04:21 GMT

@shibshab: thanks for sharing these scripts. However, I had issues running these on my PC (it gave me "no such command "read"") and decided it would be quicker for me to roll a script of my own. It looks like your scripts do quite a lot more than I need and I'll bookmark them for future reference!

RE: Read and write specific flash pages from a computer

rct42 — Tue, 21 Nov 2017 23:56:08 GMT

I've solved my problem with a custom python script and thought others might find it useful. The script can be downloaded here: jflashrw.py

Reading FDS: jflashrw.py read --start 0x6F000 --length 0x4000 --file fds.bin

Writing FDS: jflashrw.py write --start 0x6F000 --length 0x4000 --file fds.bin

Change the start address and the length as appropriate for your project (mine has a bootloader that starts at 0x73000 and has four pages for FDS). This script can also be used to read/write other parts of flash.

RE: Read and write specific flash pages from a computer

shibshab — Tue, 21 Nov 2017 07:21:56 GMT

Not a proper answer to what you are asking for, but it might help you out.

Attached is three python files which I think does what you want. It supports dumping the fds data to .yaml .bin or .hex format. Note that this is just something I made for my own use, and it is not supported by anyone and it may break and stop working. You need to have pynrfjprog installed for it to work. github.com/.../pynrfjprog

Use the command

python fds_reader.py read --source 682354148 --dest lol.yaml

To read the fds data from the kit to lol.yaml.

The idea was to support reading the fds data from the device to a human modifiable format, change the data, and the write the new data back to the device with updated CRC, however this does not work at the moment.

Copy these three files somewhere to be able to run the command. Note: It will only work on windows for now, to change this, just change remove the entire "auto detect devices" functionality.

fds_device_discovery.py

nrfmap.py

fds_reader.py