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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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Disable the scheduler giving a task full CPUPosted by Thomas Johansen on February 24, 2011 Hallo Is it possible, from with in a task, to stop the scheduler to get full CPU time? After the task has been done, then enable the scheduler again? I have a buzzer task, that is pulsing an output to make the buzzer sound. But the sound is a bit "uneven" because of the scheduler, taking time from my task. The output must be toggle every 1 ms Thomas RE: Disable the scheduler giving a task full CPUPosted by Richard Damon on February 24, 2011 You can use vTaskSuspendAll() / xTaskResumeAll() to do this, but is sounds like a better solution would be to either make the buzzer task the top priority task (so it will always run when it wants) or move the operation to an ISR on a 1ms timer interrupt. My first guess is that you probably have FreeRTOS set up with a 1 ms basic timer tick, which is probably faster than you need it if you can set up a second timer interrupt at the 1 ms rate just for toggling this bit. RE: Disable the scheduler giving a task full CPUPosted by Richard on February 24, 2011 Just to add to richard_damons reply. If the tick interrupt is fast enough, you have the option of writing a tick hook function and having it done there. However, normally when I have used things like buzzers I have set up a peripheral (PWM, counter, whatever) to output a signal with the required frequency with no CPU processing required other than to turn it on, off, or change pitch. Regards.
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