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I have an application on STM32F4 that has many interrupts. Some have high priority and others have low priority. My freeRTOS file config has these values (the default). #define configLIBRARY_LOWEST_INTERRUPT_PRIORITY 0xf #define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 5 #define configKERNEL_INTERRUPT_PRIORITY ( configLIBRARY_LOWEST_INTERRUPT_PRIORITY. My freeRTOS file config has these values (the default). #define configLIBRARY_LOWEST_INTERRUPT_PRIORITY 0xf #define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 5 #define configKERNEL_INTERRUPT_PRIORITY ( configLIBRARY_LOWEST_INTERRUPT_PRIORITY.

(1) Your conclusion is correct but remember these are low-level HW values. You should also have as look for further details.

(2) What's the purpose for interrupt priorities lower than SysTick interrupt prio? SysTick interrupt usually has the lowest prio to avoid interferences with any other interrupt used.

I've added a tiny helper macro in FreeRTOSConfig.h to help myself dealing with logical rather than HW interrupt priorities. So the logical prio order is the same as the FreeRTOS task prio order. // helper macro for logical -> real Cortex-M interrupt priorities. // logical [0. IntPrio] => real [configLIBRARY_LOWEST_INTERRUPT_PRIORITY. ConfigMAX_SYSCALL_INTERRUPT_PRIORITY] #define uxPortIntPrio(p) ( UBaseType_t(configLIBRARY_LOWEST_INTERRUPT_PRIORITY) - p ) and I'm using when calling the NVIC CMSIS interface: NVIC_SetPriority( IrqNumber, uxPortIntPrio( IntPrio ) ); with a used prio range low.high = 1.N i.e.

Intentionally above SysTick interrupt prio 0 (3) Your priority scheme should ensure that the priority driven scheduler runs the desired task(s). So if you want to run a certain post-processing task signalled by its 'coupled' ISR you should consider them as an corresponding pair. If you have a very latency sensitive HW interface you should give the interrupt and its associated handler task the highest prio.

Obviously the prios selected should match your overall application requirements i.e. Taking into account your other HW interfaces/ISRs and tasks. Also keep in mind that FreeRTOS task (software) priorities are are not directly related to HW interrupt priorities. Good luck, HS2. Normally SysTick and PendSV should be the lowest priority interrupts in the system.

Therefore it is not possible have an interrupt hat has a priority lower than them. STM32 is an exception to this IF you are using the drivers generated by the STM32 Cube. PendSV MUST still be given the lowest interrupt priority, but unfortunately due to the way the STM32 drivers are implemented SysTick will need to be the highest interrutp priority. That is because the implementation of the drivers busy wait inside interrupts for the tick count to change (yes!), and that will cause a deadlock if the SysTick has a priority lower than the busy waiting interrupt.

Please do not take that as an example of best practice! Note priority 0 is a valid interrupt priority, and in fact is the highest priority possible, and the default priority for any interrupt. That is why interrupts that use the FreeRTOS API must not use the default priority assigned to the interrupt. The confusion comes because priority 0 cannot be masked, and writing 0 into the mask register (BasePRI) unmasks all interrupts.

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Natata ebook compiler gold 3.0.3 crack. Interrupt priorities on ARM Cortex-M are complex, which is why we have this page to try and explain it: and the newer the version of FreeRTOS you have the more configASSERT() statements have been included to automatically catch misconfigurations.