FreeRTOS时钟节拍定时器使用

逍遥1

FreeRTOS在时钟节拍定时器中断处理任务是在  vApplicationTickHook()钩子函数里写么

yulanhao

在嘀嗒定时器的中断里啊，会操作任务控制块TCB进行任务切换

void xPortSysTickHandler( void )
{
        /* The SysTick runs at the lowest interrupt priority, so when this interrupt
        executes all interrupts must be unmasked.  There is therefore no need to
        save and then restore the interrupt mask value as its value is already
        known - therefore the slightly faster vPortRaiseBASEPRI() function is used
        in place of portSET_INTERRUPT_MASK_FROM_ISR(). */
        vPortRaiseBASEPRI();
        {
                /* Increment the RTOS tick. */
                if( xTaskIncrementTick() != pdFALSE )
                {
                        /* A context switch is required.  Context switching is performed in
                        the PendSV interrupt.  Pend the PendSV interrupt. */
                        portNVIC_INT_CTRL_REG = portNVIC_PENDSVSET_BIT;
                }
        }
        vPortClearBASEPRIFromISR();
}

正点原子

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逍遥1

yulanhao 发表于 2019-9-20 19:14
在嘀嗒定时器的中断里啊，会操作任务控制块TCB进行任务切换

void xPortSysTickHandler( void )

那vApplicationTickHook()钩子函数有什么用