from system on to system off

RE: from system on to system off

UBAN — Wed, 19 Oct 2016 23:12:24 GMT

Thank you for giving me good advice !

RE: from system on to system off

Ole Bauck — Tue, 18 Oct 2016 08:04:19 GMT

With the RTC you also need to enable the event:

NRF_RTC1->EVTENSET = RTC_EVTENSET_COMPARE1_Enabled << RTC_EVTENSET_COMPARE1_Pos;

See this section in the Product Specification.

RE: from system on to system off

UBAN — Tue, 18 Oct 2016 02:46:12 GMT

I tried to use the RTC. The following is the code.

void rtc_config1(void)

{

  NRF_RTC1->TASKS_STOP = 1;	// Stop timer

  NRF_RTC1->PRESCALER = 4;	// 1us resolution

  NRF_RTC1->TASKS_CLEAR = 1; // Clear timer

  NRF_RTC1->CC[1] = TRIGGER_INTERVAL1 * 5000; 

  NRF_RTC1->INTENSET = RTC_INTENSET_COMPARE1_Enabled << RTC_INTENSET_COMPARE1_Pos; 

  //attachInterrupt(RTC1_IRQn, RTC1_Interrupt);    // also used in variant.cpp to configure the RTC1 

  NVIC_EnableIRQ(RTC1_IRQn);

NRF_RTC1->TASKS_START = 1;	// Start TIMER

}

void RTC1_IRQHandler(void)

{

  if (NRF_RTC1->EVENTS_COMPARE[1] != 0)

  {

NRF_POWER->SYSTEMOFF = 1;

NRF_RTC1->EVENTS_COMPARE[1] = 0;
		
  }

}

However, interruption is not performed. Could you give me some advice?

RE: from system on to system off

Ole Bauck — Mon, 17 Oct 2016 09:07:29 GMT

The 300uA you are seeing is because the HFCLK is running while the chip is sleeping. You should use the LFCLK instead (uses about 1uA). This is done by using the RTC peripheral instead of the TIMER peripheral.

RE: from system on to system off

UBAN — Mon, 17 Oct 2016 00:51:35 GMT

Thank you for your advice. I wrote the code to become a state of system off sleep after entering system on sleep.Attach the main.c. However, the current value of system on sleep is large (0.3mA). Is main.c wrong ? Please tell me some reason.

RE: from system on to system off

Ole Bauck — Wed, 27 Jul 2016 09:46:17 GMT

__WFE() will put the system to sleep (system on sleep) until an interrupt happens. Also see this.

You should start a timer which will interrupt your code after 5 seconds and the go to sleep with __SEV();__WFE(); __WFE();. When the interrupt happens you can go to system off sleep.