RTX临界段,中断锁与任务锁

#include <rtl.h>
void os_resume (
    U32 sleep_time );    /* Number of ticks the system was in sleep mode. */

/* After Wake-up */
      sleep = (tc - LPC_WWDT->TV) / 250;
    }
    os_resume(sleep);

#include <rtl.h>
U32 os_suspend (void);

说明:

返回值:

注意要点:

例程:

#include <rtl.h>
__task void os_idle_demon (void) {
  uint32_t sleep;
  SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;    /* Configure Cortex-M3 for deep sleep */
  PWR->CR &= ~PWR_CR_PDDS;              /* Enter Stop mode when in deepsleep  */
  PWR->CR  |= PWR_CR_LPDS;              /* Voltage regulator in low-power     */
  /* Enable LSI clock and wait until ready */
  RCC->CSR |= RCC_CSR_LSION;
  while ((RCC->CSR & RCC_CSR_LSIRDY) == 0);
  /* Enable power interface clock */
  RCC->APB1ENR |= RCC_APB1ENR_PWREN;
  /* Disable backup domain write protection */
  PWR->CR |= PWR_CR_DBP;
  /* Select LSI as clock source for RTC and enable RTC */
  RCC->BDCR &= ~RCC_BDCR_RTCSEL;
  RCC->BDCR |=  RCC_BDCR_RTCSEL_1;
  RCC->BDCR |=  RCC_BDCR_RTCEN;
  /* Disable the write protection for RTC registers */
  RTC->WPR   = 0xCA;
  RTC->WPR   = 0x53;
  /* Configure RTC auto-wakeup mode */
  RTC->ISR  &= ~RTC_ISR_WUTF;           /* Clear wakeup timer flag            */
  RTC->CR   &= ~RTC_CR_WUCKSEL;         /* Set RTC clock to 2kHz              */
  RTC->CR   |=  RTC_CR_WUTIE;           /* Enable RTC wakeup timer interrupt  */
  /* Configure EXTI line 22 for wakeup on rising edge */
  EXTI->EMR  |= (1 << 22);              /* Event request is not masked        */
  EXTI->RTSR |= (1 << 22);              /* Rising trigger enabled             */
  NVIC_EnableIRQ (RTC_WKUP_IRQn);       /* Enable RTC WakeUp IRQ              */
  for (;;) {
    /* HERE: include optional user code to be executed when no task runs.     */
    sleep = os_suspend ();              /* OS Suspend                         */
    if (sleep) {
      RTC->ISR &= ~RTC_ISR_WUTF;        /* Clear timer wakeup flag            */
      RTC->CR &= ~RTC_CR_WUTE;          /* Disable wakeup timer               */
      while ((RTC->ISR & RTC_ISR_WUTWF) == 0);
      /* RTC clock is @2kHz, set wakeup time for OS_TICK >= 1ms */
      RTC->WUTR = (sleep * (OS_TICK / 1000) * 2);
      RTC->CR |=  RTC_CR_WUTE;          /* Enable wakeup timer                */
      __WFE ();                         /* Enter STOP mode                    */
      /* After Wake-up */
      if ((RTC->ISR & RTC_ISR_WUTF) == 0) {
        sleep = 0;                      /* We didn‘t enter Stop mode          */
      }
    }
    os_resume (sleep);                  /* OS Resume                          */
  }
}

#include <rtl.h>
void tsk_lock (void);

说明:

返回值:

注意要点:

例程:

#include <rtl.h>
void protect_critical_op () {
  tsk_lock ();
  do_critical_op ();
  tsk_unlock ();
}

#include <rtl.h>
void tsk_unlock (void);

说明:

返回值:

注意要点:

例程:

#include <rtl.h>
void protect_critical_op () {
  tsk_lock ();
  do_critical_op ();
  tsk_unlock ();
}