Task Management and Lab 5

More documents

Recommendations

Info

OSTaskCreateExt() • Offers more flexibility but has more overhead • Requires 9 arguments • First four, same as OSTaskCreate() • 5 TH argument: Id – unique identifier • 6 TH argument: Pbos – pointer to tasks bottom of stack TH argument: Stk_size – specifies stack size in number of elements. • 7 TH TH argument: Pext – pointer to a user-supplied supplied data area that can be used to extend the OS_TCB of the task • 8 TH TH argument: Opt – specifies whether stack checking is allowed, whether the stack will be cleared, and whether floating point operations are performed by the task, among others • 9 TH TCB -Task Control Block
Note about the TCB (Task Control Block) When a task is created, it is assigned a Task Control Block (OS_TCB) . This TCB is used to maintain the state of a task when it is preempted. The TCB resides in RAM Note about the opt argument In order to perform stack checking on a task, the OS_TASK_OPT_STK_CHK flag in the opt argument must be set Also the stack must contain zeros, then use the function OS_TASK_OPT_STK_CLR
Page 1 and 2: ELET 7404 Embedded & Real Time Oper
Page 3 and 4: Task Structure Void YourTask (void
Page 5 and 6: Idle Task Always created Created
Page 7: OSTaskCreate(): Example OSTaskCreat
Page 11 and 12: Notes about Lab 5: check stack spac
Page 13 and 14: Functions in OS_TASK.C Tasks • Ch
Page 15 and 16: Task Stacks • Each task must have
Page 17 and 18: Configuration File • You will hav
Page 19 and 20: Kernel Core •OS_CORE.c • Priori
Page 21: void STKWritTask() { char x[2]; INT

Task Management and Lab 5

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?