[SOLVED] Ozone Memory View Refresh

icwiener · Jun 7th 2020, 9:53pm

Hi,

in Ozone v3.10j, when I watch a memory location in the memory view and write to it, the value is only changed on switching to another view once and switch back to the memory view. This is also the case when using Periodic Refresh.

I have a small video showing the behaviour but connot upload it here because videos are not allowed.

Can you reproduce this? Do I misunderstand the feature of the memory view with its periodic refresh?

Cheefs

SEGGER - Nino · Jun 9th 2020, 3:18pm

Hi,

Thank you for your inquiry.
Do you see the same behaviour in the latest Ozoen version?
If yes could you provide the footage showing the issue?

Best regards,
Nino

icwiener · Jun 9th 2020, 3:35pm

Hi,

yes, I am using v3.20a now and see the same behaviour.

Cheers

SEGGER - Nino · Jun 9th 2020, 4:06pm

Hi,

Thank you for confirmation.

SEGGER - Nino wrote:

If yes could you provide the footage showing the issue?

icwiener · Jun 9th 2020, 4:32pm

I cannot get the GIF video small enough to upload it here. Can I send a video file via email?

SEGGER - Nino · Jun 9th 2020, 5:44pm

Hi,

sure simply use the ticket form below and reference that ticket to this thread.
Alternatively any video/image hosting website link works for us too.

Best regards,
Nino

icwiener · Jun 10th 2020, 9:50am

The procedure is that I change the value of a variable over CAN and then send, still over CAN, a command to store that value to Flash memory.

SEGGER - Nino · Jun 16th 2020, 4:58pm

Hi,

Thank you for providing the video.
That you are watching Flash memory here is a crucial hint,
J-Link caches the Flash content after a download. See here for more information:
wiki.segger.com/Debugging_self-modifying_code_in_flash
This leads to the effect you see here, as for the J-Link the Flash memory area was untouched by J-Link so the cache stayed untouched, so no need to update. When you "reopen" the memory window J-Link will do a readback.

To avoid the caching you can disabled it either completely or for certain memory areas with Command Strings. How to is explained in the J-Link user manual.
You can either use ExcludeFlashCacheRange or SetAllowFlashCache.

After the Flash cache is disabled the memory window for the uncached Flash area will also auto update.

If you do not want to disable the cache to keep the speed benefits while debugging we recommend to use a pointer that you place in RAM that points to the variable in Flash.

Best regards,

Nino

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