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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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ARM9 nested interrupts do not work - FreeRTOSPosted by Subhash on May 29, 2012 Hi, I have FreeRTOS running on the STR912xx processor with ARM9 core. I am facing a problem with the external interrupt. An external device asserts an interrupt, and it doesn't get serviced. The interrupt works for most of the time but there are cases when it doesn't. I suspect that when it coincides with the TIM2 interrupt, it doesn't work. The timer 2 interrupt has a higher priority than the EXT0 interrupt. In a thread "Arm- nested irqs" Richard had mentioned that he has code for nested IRQ handling for the FreeRTOS. I had gone through all the details of this thread and convinced that I need nested IRQ handling. I would appreciate if Richard or anyone else shares this code. Thank you very much for your help. -Subhash RE: ARM9 nested interrupts do not work - FreeRTOSPosted by Dave on May 30, 2012 FreeRTOS has built in interrupt nesting support for lots of cores, but not ARM7/9 because it is so complex. Have you tried using the FIQ instead of the IRQ? Chip companies often supply application notes on interrupt nesting on these cores. I know NXP do, maybe ST do too.
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NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS.
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