DevHeads IoT Integration Server•3w ago

How do I set and manage interrupt priorities in FreeRTOS?

@Middleware & OS How do I set and manage interrupt priorities in FreeRTOS? My higher priority interrupts are not preempting lower priority ones. Here's my NVIC configuration:

HAL_NVIC_SetPriority(EXTI0_IRQn, 5, 0);
HAL_NVIC_EnableIRQ(EXTI0_IRQn);

HAL_NVIC_SetPriority(EXTI0_IRQn, 5, 0);
HAL_NVIC_EnableIRQ(EXTI0_IRQn);

What could be causing this issue?

Solution:

Hi @Boss lady , you can try this ```cpp #include "FreeRTOSConfig.h" #include "stm32f4xx_hal.h" ...

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3 Replies

barafael•3w ago

Can you rule out priority inversion? Do you have locks in your system?

Solution

Enthernet Code•2w ago

Hi @Boss lady , you can try this

#include "FreeRTOSConfig.h"
#include "stm32f4xx_hal.h"

void HAL_NVIC_Setup(void) {
    HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);

    HAL_NVIC_SetPriority(EXTI0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY + 1, 0);
    HAL_NVIC_EnableIRQ(EXTI0_IRQn);
}

void EXTI0_IRQHandler(void) {
    BaseType_t xHigherPriorityTaskWoken = pdFALSE;
    
    // Clear the interrupt
    __HAL_GPIO_EXTI_CLEAR_IT(GPIO_PIN_0);

    // Perform your interrupt processing here
    
    // Notify FreeRTOS about the ISR
    portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
}

#include "FreeRTOSConfig.h"
#include "stm32f4xx_hal.h"

void HAL_NVIC_Setup(void) {
    HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);

    HAL_NVIC_SetPriority(EXTI0_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY + 1, 0);
    HAL_NVIC_EnableIRQ(EXTI0_IRQn);
}

void EXTI0_IRQHandler(void) {
    BaseType_t xHigherPriorityTaskWoken = pdFALSE;
    
    // Clear the interrupt
    __HAL_GPIO_EXTI_CLEAR_IT(GPIO_PIN_0);

    // Perform your interrupt processing here
    
    // Notify FreeRTOS about the ISR
    portYIELD_FROM_ISR(xHigherPriorityTaskWoken);
}

Boss lady•2w ago

Yes @barafael

Gaming

Programming

How do I set and manage interrupt priorities in FreeRTOS?