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FreeRTOS Support ArchiveThe FreeRTOS support forum is used to obtain active support directly from Real Time Engineers Ltd. In return for using our top quality software and services for free, we request you play fair and do your bit to help others too! Sign up to receive notifications of new support topics then help where you can.
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understanding vApplicationIdleHookPosted by Robert H. Oujesky on October 24, 2011 I implemented vApplicationIdleHook just like in the ebook. Every second, I have a task which prints out the value of ulIdleCycleCount. the value hovers around 2,724,536. Sounds like a nice beg number which, I think, means we have lots of idle time, but I am not really sure. What does that number really mean when I am running a PIC32 at 80MHZ? thanks! RE: understanding vApplicationIdleHookPosted by MEdwards on October 24, 2011 Is ulIdleCycleCount a variable that just gets incremented each time vApplicationIdleHook() is executed? If so, then all it is is a count of how many times the function has been called. RE: understanding vApplicationIdleHookPosted by Robert H. Oujesky on October 24, 2011 Is there a way to correlate that to % of CPU used? thanks! RE: understanding vApplicationIdleHookPosted by MEdwards on October 24, 2011 No. If you want to know the % of CPU used then you can do one of three things. 1) Use run time stats http://www.freertos.org/rtos-run-time-stats.html 2) Use the traceTASK_SWITCHED_IN trace macro to see when the idle task is switched in, and when it is switched out, and use a timer to keep track of when it is the task in the running state. 3) Use the idle hook to toggle a digital output pin and view it on a scope. Crude but effective. Probably other things too.
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NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS.
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