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Chapter 5
.TickSpokePtr
This pointer is used to know which spoke in the “tick wheel” the task is linked to. The tick
wheel will be described in “Chapter 9, “Interrupt Management” on page 157.”
.NamePtr
This pointer allows a name (an ASCII string) to be assigned to each task. Having a name is
useful when debugging, since it is user friendly compared to displaying the address of the
OS_TCB . Storage for the ASCII string is assumed to be in user space in code memory (ASCII
string declared as a const) or in RAM.
.StkBasePtr
This field points to the base address of the task’s stack. The stack base is typically the lowest
address in memory where the stack for the task resides. A task stack is declared as follows:
CPU_STK MyTaskStk[???];
CPU_STK is the data type you must use to declare task stacks and ??? is the size of the stack
associated with the task. The base address is always &MyTaskStk[0] .
.TaskEntryAddr
This field contains the entry address of the task. As previously mentioned, a task is declared
as shown below and this field contains the address of MyTask .
void MyTask (void *p_arg);
.TaskEntryArg
This field contains the value of the argument that is passed to the task when the task starts.
As previously mentioned, a task is declared as shown below and this field contains the
value of p_arg .
void MyTask (void *p_arg);
.PendDataTblPtr
μC/OS-III allows the task to pend on any number of semaphores or message queues
simultaneously. This pointer points to a table containing information about the pended
objects.
100
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