Using Flash during Softdevice

RE: Using Flash during Softdevice

Turbo J — Fri, 15 May 2020 19:31:56 GMT

My bad. Read the code wrong - you copy FROM flash and not into with memcpy. That is totally safe, of course.

RE: Using Flash during Softdevice

Einar Thorsrud — Fri, 15 May 2020 13:26:08 GMT

Hi,

You are trying to both erase and write to page 0, and this is the MBR. You cannot write to anything that is in the MBR and SoftDevice region, and of course, you should not write to anything that holds any other code. Just pick a page that is empty and try that instead. If you don't have a full understanding of your memory layout, you cust use the nRF Connect Programmer to get an overview of the memory layout of your configuration.

RE: Using Flash during Softdevice

oguzhanK — Fri, 15 May 2020 10:53:20 GMT

I did not use memcpy to write flash. ????

RE: Using Flash during Softdevice

Turbo J — Fri, 15 May 2020 10:32:40 GMT

You cannot erase page zero when using softdevice - this is where the MBR is located. The first page you could erase is the first page above the softdevice itself.

If you actually bothered to check return codes, this would be very obvious (invalid param or similar error code).

Using LibC memcpy() for flash writes is asking for trouble: Newlib-nano memcpy() copies a single byte at a time, while flash must be written to 4 bytes at once. Those nvm driver functions exist for a reason.