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NXP KL82 RTX low power mode

Hi there,

Is there anybody know where I can find some example code for NXP KL82 processor running in low power mode on RTX?

I already have a working project setup by colleague. but there is no os_idle_thread implemented. I searched on internet and get some clue on how to do it. I know I have to setup a lptmr, llwu, and then put the mcu into lls mode. I saw an example code write for TI's msp430 chip. I did some modification it seems not working properly.

here is my code


void os_idle_demon (void) {

  for (;;) {

          tc_weakup = os_suspend();
          if (tc_weakup > 0)
          {
                  tc = 0;
                  lp_sleep = 1;

          /* Do not wake up on exit from ISR */
                  SCB->SCR |= SCB_SCR_SLEEPONEXIT_Msk;
                  /* Setting the sleep deep bit */
                  SCB->SCR |= (SCB_SCR_SLEEPDEEP_Msk);
                  __WFI();

          }

          os_resume(tc);

  }
}

void systime_tick()
{


        if (tc++ > tc_weakup && lp_sleep)
        {
                lp_sleep = 0;
                scb->scr &= ~scb_scr_sleeponexit_msk;

                return;
        }
    ++systime_ms;
}

any insight would be grateful.
thank you

Parents

0 Diandi Zhu over 7 years ago

tried following code still no luck

volatile uint32_t tc;
volatile uint32_t tc_weakup;
volatile uint8_t lp_sleep = 0;
void LPTMR1_IRQHandler()
{
        if (kLPTMR_TimerInterruptEnable & LPTMR_GetEnabledInterrupts(LPTMR1))
        {
                LPTMR_DisableInterrupts(LPTMR1, kLPTMR_TimerInterruptEnable);
                LPTMR_ClearStatusFlags(LPTMR1, kLPTMR_TimerCompareFlag);
                LPTMR_StopTimer(LPTMR1);
        }
}

void LLWU_IRQHandler(void)
{
    /* If wakeup by LPTMR. */

        tc = 0;
        //LPTMR_DisableInterrupts(LPTMR0, kLPTMR_TimerInterruptEnable);
        if (LPTMR1->CSR >> 7 )
        {
                INTMUX_DisableInterrupt(INTMUX0, 0, LPTMR1_IRQn);
                LPTMR_ClearStatusFlags(LPTMR1, kLPTMR_TimerCompareFlag);
                LPTMR_StopTimer(LPTMR1);
                NVIC_EnableIRQ(LPTMR0_IRQn);
        }



}



/// \brief The idle demon is running when no other thread is ready to run
void os_idle_demon (void) {

  for (;;) {
//        __WFI();
          tc_weakup = os_suspend();
          if (tc_weakup > 0)
          {
                  lptmr_config_t lptmrConfig;
                  /* Setup LPTMR. */
                  LPTMR_GetDefaultConfig(&lptmrConfig);
                  /* Use LPO as clock source. */
                  lptmrConfig.prescalerClockSource = kLPTMR_PrescalerClock_1;
                  lptmrConfig.bypassPrescaler = true;
                  LPTMR_Init(LPTMR1, &lptmrConfig);

                  NVIC_EnableIRQ(LLWU_IRQn);
          NVIC_EnableIRQ(LPTMR1_IRQn);

                  LPTMR_SetTimerPeriod(LPTMR1, tc_weakup - 1U);
                  LPTMR_StartTimer(LPTMR1);


                  LLWU_EnableInternalModuleInterruptWakup(LLWU, 0, true);//Module 0 for lptmr0 and lptmr1
                  NVIC_EnableIRQ(LLWU_IRQn);

                  smc_power_mode_lls_config_t lls_config;
                  lls_config.subMode = kSMC_StopSub3;
                  lls_config.enableLpoClock =1;

                  SMC_SetPowerModeLls(SMC, &lls_config);
                  tc = 0;


          }

          os_resume(tc_weakup);

  }
}

Reply

0 Diandi Zhu over 7 years ago

tried following code still no luck

volatile uint32_t tc;
volatile uint32_t tc_weakup;
volatile uint8_t lp_sleep = 0;
void LPTMR1_IRQHandler()
{
        if (kLPTMR_TimerInterruptEnable & LPTMR_GetEnabledInterrupts(LPTMR1))
        {
                LPTMR_DisableInterrupts(LPTMR1, kLPTMR_TimerInterruptEnable);
                LPTMR_ClearStatusFlags(LPTMR1, kLPTMR_TimerCompareFlag);
                LPTMR_StopTimer(LPTMR1);
        }
}

void LLWU_IRQHandler(void)
{
    /* If wakeup by LPTMR. */

        tc = 0;
        //LPTMR_DisableInterrupts(LPTMR0, kLPTMR_TimerInterruptEnable);
        if (LPTMR1->CSR >> 7 )
        {
                INTMUX_DisableInterrupt(INTMUX0, 0, LPTMR1_IRQn);
                LPTMR_ClearStatusFlags(LPTMR1, kLPTMR_TimerCompareFlag);
                LPTMR_StopTimer(LPTMR1);
                NVIC_EnableIRQ(LPTMR0_IRQn);
        }



}



/// \brief The idle demon is running when no other thread is ready to run
void os_idle_demon (void) {

  for (;;) {
//        __WFI();
          tc_weakup = os_suspend();
          if (tc_weakup > 0)
          {
                  lptmr_config_t lptmrConfig;
                  /* Setup LPTMR. */
                  LPTMR_GetDefaultConfig(&lptmrConfig);
                  /* Use LPO as clock source. */
                  lptmrConfig.prescalerClockSource = kLPTMR_PrescalerClock_1;
                  lptmrConfig.bypassPrescaler = true;
                  LPTMR_Init(LPTMR1, &lptmrConfig);

                  NVIC_EnableIRQ(LLWU_IRQn);
          NVIC_EnableIRQ(LPTMR1_IRQn);

                  LPTMR_SetTimerPeriod(LPTMR1, tc_weakup - 1U);
                  LPTMR_StartTimer(LPTMR1);


                  LLWU_EnableInternalModuleInterruptWakup(LLWU, 0, true);//Module 0 for lptmr0 and lptmr1
                  NVIC_EnableIRQ(LLWU_IRQn);

                  smc_power_mode_lls_config_t lls_config;
                  lls_config.subMode = kSMC_StopSub3;
                  lls_config.enableLpoClock =1;

                  SMC_SetPowerModeLls(SMC, &lls_config);
                  tc = 0;


          }

          os_resume(tc_weakup);

  }
}

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