Semaphore Execution time
Hello FreeRTOS Team
I use TMS570LC4357 HDK with FreeRTOS, HALCoGen v4.5.1 for Code generation and CCSv6 as IDE.
I use Counting Semaphore to handle an Interrupt task. I’ve configured the Semaphore queue size as 100 and the waiting time for Semaphore as 1 tick.
When I run the code, the time taken between xSemaphoreGiveFromISR( xSemaphore, &xHigherPriorityTaskWoken ); inside the ISR and the if(xSemaphoreTake( xSemaphore, 0x01 ) == pdTRUE) inside the ISR Handler is 880ms. Also I face a Jitter in the task that runs cyclically every 1ms. Does Counting Semaphore execution time take 880ms?
Which of these consume the least exection time in event handling
i) Counting Semaphore
ii) Binary Semaphore
iii) Event Group ?
Semaphore Execution time
When I run the code, the time taken between xSemaphoreGiveFromISR( xSemaphore, &xHigherPriorityTaskWoken ); inside the ISR and the if(xSemaphoreTake( xSemaphore, 0x01 ) == pdTRUE) inside the ISR Handler is 880msThat sounds exceptionally long. Q1 Are you using the xHigherPriorityTaskWoken parameter to request a context switch inside the ISR? Q2 Does the task you are unblocking have a priority above the priority of the currently running task (the task the ISR interrupted)?
Which of these consume the least exection time in event handlingActually the least amount of time will be a direct to task notification, which you can use in exactly the same way as either a binary or counting semaphore. Look at the example code on the following page: http://www.freertos.org/vTaskNotifyGiveFromISR.html Regards.
Semaphore Execution time
For Q1, yes I did use xHigherPriorityTaskWoken parameter. Is NULL sufficient for use there?
For Q2, the Unblocking task has the highest priority of all tasks.
Semaphore Execution time
yes I did use xHigherPriorityTaskWoken parameter. Is NULL sufficient for use thereNo – if you pass in NULL then it means you are not using it. Please read the documentation for the port you are using, and the API documentation for the functions you are using in the interrupts. Regards.
Semaphore Execution time
I use Cortex R5F (TMS570LC4357) and I donot find the documentation for this particular port
Semaphore Execution time
The quick start guide shows you how to locate the documentation:
http://www.freertos.org/FreeRTOS-quick-start-guide.html
although I believe the code TI are shipping is slightly different to
that in the FreeRTOS zip file download.
The web server seems very slow at the moment…hopefully that is a
temporary glitch.
Regards.
Semaphore Execution time
I find only Cortex R4F port available in Supported devices in the above link. Will FreeRTOS provide port for Cortex R5F in the near future?
Semaphore Execution time
May I know what are the possible conditions that causes Scheduler to Suspend itself when running FreeRTOS code ?
Semaphore Execution time
I’m not sure that, from the perspective of the RTOS, there is a
difference between the two
(http://www.arm.com/products/processors/cortex-r/cortex-r5.php). Would
you disagree? I know WITTENSTEIN have supplied OpenRTOS for both.
Regards.