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Chapter 5
5
The priority of the debug task should generally be low since it is not critical and the task
performed can be executed in the background.
For the μC/OS-II and μC/OS-III RTOS ports, the following macros must be configured
within app_cfg.h :
■
USBD_OS_CFG_CORE_TASK_PRIO
■
USBD_OS_CFG_TRACE_TASK_PRIO
Note: if USBD_CFG_DBG_TRACE_EN is set to DEF_DISABLED , USBD_OS_CFG_TRACE_TASK_PRIO
should not be defined.
5-2-2 TASK STACK SIZES
For the μC/OS-II and μC/OS-III RTOS ports, the following macros must be configured
within app_cfg.h to set the internal task stack sizes:
■
USBD_OS_CFG_CORE_TASK_STK_SIZE
1000
■
USBD_OS_CFG_TRACE_TASK_STK_SIZE
1000
Note: if USBD_CFG_DBG_TRACE_EN is set to DEF_DISABLED , USBD_OS_CFG_TRACE_TASK_STK_SIZE
should not be defined.
The arbitrary stack size of 1000 is a good starting point for most applications.
The only guaranteed method of determining the required task stack sizes is to calculate the
maximum stack usage for each task. Obviously, the maximum stack usage for a task is the
total stack usage along the task’s most-stack-greedy function path plus the (maximum) stack
usage for interrupts. Note that the most-stack-greedy function path is not necessarily the
longest or deepest function path.
The easiest and best method for calculating the maximum stack usage for any task/function
should be performed statically by the compiler or by a static analysis tool since these can
calculate function/task maximum stack usage based on the compiler’s actual code
generation and optimization settings. So for optimal task stack configuration, we
recommend to invest in a task stack calculator tool compatible with your build toolchain.
70
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