MQX_OUT_OF_MEMORY Error at _event_open_fast

[hard_ware]

I'm useing CW 10.1 and MQX 3.7.

I Use an fast auto clear event to syncronize between an ISR and a Task that is called every 250ms.

Everything is working fine for the first 50 seconds, after that time, every time i call

err = _event_open_fast(1, &i2c_event_ptr);

I get MQX_OUT_OF_MEMORY.

I am not useing any dynamic memory in my task and my task stack is at 6%.

Any ideas where to look for the reason of the error?

[timias]

You might not be using memory, but an MQX driver might be trying to allocate some memory.

If your task stack usage is at 6% likely it should be shrunk, since it would seem (based on the limited info I have)that it is way to big. ( My stacks are around 50% utilization)

You can also check the MQX->Lightweight Memory Blocks and see what your total RAM usage is, it is listed at the bottom.

[DavidS]

Hi Guys,

Open the intflash.lcf and increase the interrupt stack size:

   __DEFAULT_INTERRUPT_STACK_SIZE = 1024;

It is located in the FSLMQX\lib\twrk60n512.cw10\bsp folder.

Hope this helps.

Regards,

David

[hard_ware · Accepted solution]

Thank for the help,

I found out in the MQX Memory Pool - Box that my RAM gets filled with a lot of Event connections Objects.

My ISR looked like this:

void I2C_Sensor_OnMasterBlockReceived(LDD_TUserData *UserDataPtr)
{
    pointer i2c_isr_event_ptr;
    _event_open_fast(1, &i2c_isr_event_ptr);
    _event_set(i2c_isr_event_ptr, 0x02);
}

So every time i get an Interrupt I opened a new event connection.

So i know what the problem is, but the _event_close funktion is not allowed to be called from an ISR.

I tried to make the event handler a public variable and open it only at the init of my task, that worked, but i think there must be a better way than a global variable....