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Zephyr project on STM32

   Zephyr Workbench, a VSCode extension to manage Zephyr on STM32.
It enables users to easily create, develop, and debug Zephyr applications.
Main features:
  • Install host dependencies.
  • Import toolchain and SDK.
  • Create, configure, build and manage apps.
  • Debug STM32.
You can directly download it from the VSCode marketplace
For more details, visit the Zephyr Workbench

System Workbench for STM32

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You are viewing a reply to STM32F4 DMA Interrupt big latency :(  

STM32F4 DMA Interrupt big latency :(

Posted by aditya_rm on 2016-04-04 12:37

Thanks for the response, Bernard.

The issue is that it is causing a slowdown of the DMA when there is *no* optimisation set. I’ve switched off GCC optimisation and experimented with different Debug levels (None to Max). If no code is being optimised then that should not be an issue, correct?

Also, I’m using code that came along with the Cube examples. I’ve only minimally modified it to use my own images; as I said I’ve tried using a different IDE and it works.

Thanks,
Aditya

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Posted by dautrevaux on 2016-04-04 13:23 France

Hi Aditya,

What kind of slowdown do you notice? Of course unoptimized code runs slower than optimized one, but, except if you are very close to the maximum MCU load, it should not be noticeable (except, of course, if you measure it in your code)...

As for the other IDEs, I can’t say but they may not optimize like GCC. Of course it is possible you ran in a GCC bug, but that is very improbable; I would rather bet that some code is not clean enough (either ST’s or your’s) and fools the optimizer...

Bernard (Ac6)

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