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Getting Started with μC/OS-III
L3-3(5)
BSP_LED_Off() is a function that will turn off all LEDs because the function is
written so that a zero argument means all the LEDs.
L3-3(6)
Most μC/OS-III tasks will need to be written as an infinite loop.
L3-3(7)
This BSP function toggles the state of the specified LED. Again, a zero indicates
that all the LEDs should be toggled on the evaluation board. Simply change the
zero to 1 and this will cause LED #1 to toggle. Exactly which LED is LED #1?
That depends on the BSP developer. Specifically, encapsulate access to
LEDs through such functions as
BSP_LED_On() ,
BSP_LED_Off()
and
BSP_LED_Toggle() . Also, we prefer to assign LEDs logical values (1, 2, 3, etc.)
instead of specifying which port and which bit on each port.
L3-3(8)
Finally, each task in the application must call one of the μC/OS-III functions
that will cause the task to “wait for an event.” The task can wait for time to
expire (by calling OSTimeDly() , or OSTimeDlyHMSM() ), or wait for a signal or a
message from an ISR or another task. Chapter 11, “Time Management” on
page 183 provides additional information about time delays.
59
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