I have a problem about the MQX task scheduling

wyflsxy — Fri, 16 Oct 2015 02:25:32 GMT

hello all,

I used KDS3.0 and based on MQX4.2 and KSDK1.2 project, my board is twrk64f120m,

the task scheduling to me have a little bit of problem

I have add the TCPIP tasks and it was worked ok before,

But when I add the CAN bus program to initialization,

it looks like that the task is blocked in lwsem.c as below

could you know what's the problem?

{

sem_chk_ptr = (LWSEM_STRUCT_PTR) ((void *) kernel_data->LWSEM.NEXT);

while (sem_chk_ptr != (LWSEM_STRUCT_PTR) ((void *) &kernel_data->LWSEM))

{

if (sem_chk_ptr == sem_ptr)

{

/* remove semaphore from kernel LWSEM queue */

_QUEUE_REMOVE(&kernel_data->LWSEM, sem_ptr);

break;

} /* Endif */

sem_chk_ptr = (LWSEM_STRUCT_PTR) ((void *) sem_chk_ptr->NEXT);

} /* Endwhile */

}

Re: I have a problem about the MQX task scheduling

danielchen — Tue, 20 Oct 2015 22:56:29 GMT

I guess there is a lwsem conflict, this lwsem is shared between your can task and tcpip task

Regards

Daniel

wyflsxy — Wed, 21 Oct 2015 08:35:25 GMT

but I don't have a lwsem shared between and can

I only used lwsem between tcpip init and tcpip send