topic Re: KW36 user task in Wireless MCU

KW36 user task

JiCheng_ZhangXiang — Thu, 24 Dec 2020 03:25:34 GMT

Hello, NXP

I try to creat my task on the wirelessuart example from SDK_2.2.5_FRDM-KW36. But I found there's as strange problem as below:

(1) If the priority of my task is higher than the startup_task, my task work but BLE broadcast don't work. I found the function OSA_TaskCreate(OSA_TASK(Host_Task) in the the startup_task will return fail, it cause BLE broadcast don't work

(2 If the priority of my task is lower than the startup_task, the startup_task work, and I can see BLE broadcast work use my cellphone. but my task don't work.

as we know, SDK used the FreeRTOS. If the priority value of the task is bigger, the priority is higher. Now I puzlled, so my question is how to define user task correctly?

Re: KW36 user task

Xiang_Li — Mon, 28 Dec 2020 09:48:50 GMT

The function OSA_TaskCreate() returns either a task ID, if the task is created successfully, or returns Null if "The task cannot be created."

If the task cannot be created, the first thing I'd check is whether or not you allocate enough resources for the task.

Could it be possible that you create your task, but forgot to allocate resources, and then the Host_Task is failed at creation?

To allocation resource there is something like:
OSA_TASK_DEFINE( Job1, OSA_PRIORITY_HIGH, 1, 800, 0);

Below is the function header I copied:

/*!
* @brief Creates a task.
*
* This function is used to create task based on the resources defined
* by the macro OSA_TASK_DEFINE.
*
* @param thread_def pointer to the osaThreadDef_t structure which defines the task.
* @param task_param Pointer to be passed to the task when it is created.
*
* @retval taskId The task is successfully created.
* @retval NULL The task can not be created..
*
* Example:
@code
osaTaskId_t taskId;
OSA_TASK_DEFINE( Job1, OSA_PRIORITY_HIGH, 1, 800, 0);;
taskId = OSA__TaskCreate(OSA__TASK(Job1), (osaTaskParam_t)NULL);
@endcode
*/

Re: KW36 user task

nxf56274 — Tue, 29 Dec 2020 07:31:39 GMT

Hi,

I made a test. If your task priority is lower than main task and your stack for your own task is larger, your task won't work. Increasing the value of gTotalHeapSize_c in app_preinclude.h will solve this problem.

Have a great day,
TIC

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Re: KW36 user task

JiCheng_ZhangXiang — Wed, 06 Jan 2021 03:59:51 GMT

yes, before you reply, I tried change the heapsize and creat my task successfully!

Thank you all the same.