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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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need xSemaphoreTakeFromISR(...)Posted by Jeff Andle on October 28, 2011 I have a state flow where a serial transmit task blocks first on having anything to transmit and then on a semaphore given by a timer interrupt. The timer fires after a required bus activity period. However, if there is a RX character after the semaphore is geven by the timer interrupt, there is no way to take it back from the RX ISR. The TX could immediately check for serial activity after unblocking, but the RX event could complete before the TX unblocks, still being within the timer interval. I really need the RX ISR to take back the semaphore each time. Since "give" is aliased to xQueueGenericSendFromISR, I should be able to take it back using xQueueReceiveFromISR, right? RE: need xSemaphoreTakeFromISR(...)Posted by MEdwards on October 28, 2011 Yes. Ensure to only use the FromISR versions and absolutely never do anything that could cause the ISR to attempt to block.
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NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS.
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