I have encountered following scenario in which tasks notification from ISR stops working : I Have 2 interrupts a) EXTI: First one is external interrupts which enables a immediate timer(TIM) interrupt. b) TIM: second one is an immediate timer interrupt enabled by EXTI interrupts. I am calling…

[image] vishvender: Because my application requires this interrupt to be in secure side. If that is the case, you cannot call any FreeRTOS API from this ISR and then you do not need to disable this interrupt. May I please ask you to elaborate on why your application needs this interrupt to be…

From your description it seems that when two notifications are received in quick succession from the interrupts, the second notification is missed before the task acting upon it unblocks itself. If so did you try using xTaskNotifyFromISR() with action eIncrement and on the receiving task use ulTaskN…

This page provides details and examples for the technique that Ravi described - FreeRTOS task notifications, fast Real Time Operating System (RTOS) event mechanism

Hi , Thanks!! Issue is because RTOS taskENTER_CRITICAL(); is not able to disable the interrupt in role. Thing is i am using a trustzone enabled code. My RTOS scheduler is running in non-secure section and interrupts are configured in secure section. Now taskENTER_CRITICAL(); writes BASEPRI_NS …

[image] vishvender: I am guessing since my interrupt is secure one it is using BASEPRI_S during IRQ triggering. If so , how can i mask BASEPRI_S with configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY ?? That assumption does not seem correct. Which Cortex-M33 part are you using? How many priority …

FreeRTOSConfig.h (8.7 KB) I am working on STM32U575 device ARM Cortex-M33. __NVIC_PRIO_BITS is 4 for this . And i am using priority grouping NVIC_PRIORITYGROUP_4

Also i found this forum https://community.arm.com/support-forums/f/architectures-and-processors-forum/8764/correct-way-to-mask-interrupts-in-secure-world-armv8m-m33 which says : “If BASEPRI_NS is set to 0x80, and if PRIS is set to 1, it blocks Secure interrupts with priority levels 0xC0 to 0xFF” …

[image] vishvender: what i require is how can i disable secure interrupts from 0x01 to 0xFF !!! Why do you need to disable secure interrupts? Since you are calling FreeRTOS functions from ISR, you need to configure this EXTI interrupt as non-secure.

Because my application requires this interrupt to be in secure side. But as i am able to disable this interrupt when its priority is >= 12 ,why is not working for lesser priority.

Basically, the hardware doesn’t allow non-secure code to disable certain interrupts priorities so that the secure side can make sure it isn’t interfeared with by using those interrupt priorites

xTaskGenericNotifyFromISR() is not working if called twice in ISR before unblocking happens

Kernel

RAc August 8, 2022, 1:56pm 2

xTaskResumeAll lockup - Kernel - FreeRTOS Community Forums

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xTaskGenericNotifyFromISR() is not working if called twice in ISR before unblocking happens

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