RTOS/SYSBIOS: How to determine the stack size and priority of a task?

NanShan

Intellectual 475 points

Part Number: SYSBIOS

Tool/software: TI-RTOS

Hi all，

Q：when we creat a new task，How to determine the stack size and priority of a task？

Thanks in advance.

over 8 years ago

0 Cvetolin Shulev-XID over 8 years ago

TI__Guru 65405 points

Hi NanSHan,

You can set task size during task creation by stackSize parameter. See the example below:

var tskParams = new Task.Params;
tskParams.stackSize = 512;
var task0 = Task.create('&task0Fxn', tskParams);

Task priority can be set using Task_setPri command.
For more details refer to:
www.ti.com/.../spruex3q.pdf

BR
Tsvetolin Shulev

0 NanShan over 8 years ago in reply to Cvetolin Shulev-XID

Intellectual 475 points

Hi Cvetolin Shulev-XID,

Thanks for your replies!
But I want to know why the value of stackSize is 512,why not 1024 or some other numbers?

0 Cvetolin Shulev-XID over 8 years ago in reply to NanShan

TI__Guru 65405 points

This is only an example. The stack size is configurable.

BR
Tsvetolin Shulev

0 NanShan over 8 years ago in reply to Cvetolin Shulev-XID

Intellectual 475 points

Hi Cvetolin Shulev-XID,

Thanks for your replies!
I know the stack size is configurable.But I want to know which number should we choose when we creat a task?What determines the size of the stack?

0 Cvetolin Shulev-XID over 8 years ago in reply to NanShan

TI__Guru 65405 points

There is no single solution for stack size. It strongly depends on the use case. See description about how to determine the task stack size at:
e2e.ti.com/.../275601

BR
Tsvetolin Shulev

0 ToddMullanix over 8 years ago in reply to Cvetolin Shulev-XID

TI__Guru* 96960 points

There's this write-up/video also that might be helpful: training.ti.com/debugging-common-application-issues-ti-rtos.

Basically start high and lower if you need the memory. I like to leave ~15% extra above the peak after I run all the uses cases/stress tests.

Todd

0 NanShan over 8 years ago in reply to ToddMullanix

Intellectual 475 points

Hi ToddMullanix,

Thanks for your replies!
But the page:training.ti.com/debugging-common-application-issues-ti-rtos.can not be open.

best regards!

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RTOS/SYSBIOS: How to determine the stack size and priority of a task?