PE, Round Robin

rajbatra — Fri, 12 Jun 2015 00:35:16 GMT

What's the recommended way of creating an MQx task in KDS? I was expecting it to be through OS_Task in the component library via processor expert. However, I want to create a time sliced task but processor expert seems to only support the attribute for 'Floating point task'.

Is there a field to wedge the MQX_TIME_SLICE_TASK attribute or do I forget about using PE for tasks and create them manually?

Thanks,

-Raj

Re: PE, Round Robin

Carlos_Musich — Tue, 23 Jun 2015 17:01:20 GMT

Hi Raj,

MQX creates a task template structure as follows:

const TASK_TEMPLATE_STRUCT MQX_template_list[] =

{

/* Task Index, Function, Stack, Priority, Name, Attributes, Param, Time Slice */

{ WORLD_TASK, world_task, 700, 9, "world", MQX_AUTO_START_TASK, 0, 0 },

{ HELLO_TASK, hello_task, 700, 8, "hello", 0, 0, 0 },

{ 0 }

};

The last element of each structure is the time slice. If you set this value the scheduling policy will be Round Robin, if not it is FIFO.

If you are using classic MQX please see chapter 3.4.2 Round Robin Scheduling of MQX_User_Guide.pdf located in C:\Freescale\Freescale_MQX_4_2\doc\mqx

If you are using MQX for KSDK you must see at the same chapter of MQX RTOS for Kinetis SDK User's Guide.pdf located in C:\Freescale\KSDK_1.2.0\doc\rtos\mqx

Best regards,

Carlos

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PE, Round Robin

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