Re: [lwip-users] LWIP and System Interrupts

[Jens Nielsen]

Hi

Yes this sounds like a peculiarity in your system :)  It sounds to me 
like you should be more concerned about your FreeRTOS setup than lwip, 
but just to be sure:

lwip offers different methods for thread protection, you can start by 
reading here: http://www.nongnu.org/lwip/2_0_x/group__sys__prot.html

And then check your lwipopts.h for your settings and also check the 
sys_arch.c file which you should get from CubeMX

I'm not using CubeMX but in my code the worst thing lwip can do is 
taskENTER_CRITICAL(); which disables interrupts but this should only be 
used for short snippets (unless you've found a bug) and you should have 
set up your FreeRTOS port and 
configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY so this doesn't stop your 
high prio interrupt anyway

Best regards
Jens

On 2018-06-09 14:33, dwstech wrote:
> I apologize if this question has been asked before, however I have not been
> able to find an answer.
> I am using an STM32F407 processor, FreeRTOS and LWIP 2.0.0. I have
> configured my software system with CubeMX and then made modifications along
> the way to get things working.
>
> My system has a very real time component, and interrupt that must be served
> every 1msec. The interrupt processing is very fast but it must occur for the
> system to work. This interrupt uses no RTOS functions and no LWIP functions.
> I have set the Priority of the interrupt to 0 group 0.
>
> A background task will kick off a publication to a server periodically
> (small MQTT publication to a broker). When this is occurring my interrupt
> appears to be disabled for about 100msec and this coincides with the call to
> lwip_send. I was under the impression LWIP just used a Mutex to lock the
> core but somewhere along the way it appears to disable interrupts.
>
> I would think that if this is standard behavior there would be a lot of
> discussion so I am think this is a peculiarity in my system but I have no
> idea where to look to resolve it.
> Help would be appreciated.
>
>
>
>
>
> --
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>
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