MQX Software SolutionsのトピックMQXLite Semaphore issue in an interrupt

MQXLite Semaphore issue in an interrupt

anthonyduhamel — Tue, 30 Aug 2016 12:38:22 GMT

Hello guys,

I'm facing an issue using MQXLite. My project runs on CW10.6 + PEx + MQXLite.

I'm calling "_lwsem_post" in an interrupt handler to synchronize a task with this ISR but my program goes in HardFault. I well initialized the semaphore and it is valid before calling the "post" method. The fault comes in the "lwsem.c" file just at the "_INT_ENABLE" line.

So.... well, enabling/disabling the interrupts in an interrupt does not sound good, but that normally the usual purpose of the semaphores.

Does anybody got the answer?

Thank you,

Anthony

Re: MQXLite Semaphore issue in an interrupt

DavidS — Wed, 31 Aug 2016 14:41:49 GMT

Hi Anthony,

You should be able to call the _lwsem_post() from ISR OK.

Have you checked your task stack size to ensure it is not overflowing.

Are there any ISR's in the system that are enabled but not initialized yet?

Is your LWSEM_STRUCT_PTR a global variable?

Regards,

David

Re: MQXLite Semaphore issue in an interrupt

anthonyduhamel — Fri, 02 Sep 2016 07:44:15 GMT

Hi David,

My semaphore is a global variable and initialized is my init_task.

There is no task in overflow.

Is is valid when the ISR occurs.

My task I called "Door" is waiting for the semaphore.

And all the enabled ISRs would be initialized. I have removed the semaphore and replaced it by a simple variable (_b_IsMoved) and it works. But it is not memory safe when you deal with several threads....

I also tried the semaphore out of the ISR, and it works. So my issue is probably ISR dependent.

I can share the source code if you want to take a look at.

Thank you,

Anthony