EFM32 funktioniert nur mit "breakpoint" richtig.

int main(void)

{

  CHIP_Init();

  CMU_OscillatorEnable(cmuOsc_HFRCO,1,0);

  CMU_ClockEnable(cmuClock_HFPER, true);

  CMU_ClockEnable(cmuClock_GPIO,1);

  CMU_ClockEnable(cmuClock_I2C0,1);

  CMU_ClockEnable(cmuClock_RTC, true);

  CMU_OscillatorEnable(cmuOsc_LFRCO, true, 0);

  CMU_ClockSelectSet(cmuClock_LFA, cmuSelect_LFRCO);

  CMU_ClockEnable(cmuClock_LFA,true);

  CMU_ClockEnable(cmuClock_CORELE ,true);

  ///////I2C////////////////////////////

  GPIO_PinModeSet(gpioPortD, 7, gpioModeWiredAndPullUpFilter, 1);

  GPIO_PinModeSet(gpioPortD, 6, gpioModeWiredAndPullUpFilter, 1);

  I2C0->ROUTE = I2C_ROUTE_SDAPEN | I2C_ROUTE_SCLPEN | (1 << _I2C_ROUTE_LOCATION_SHIFT);

  GPIO_PinModeSet(gpioPortC, 8, gpioModePushPull , 1);

  GPIO_PinOutClear(gpioPortC,8);

  I2C_Init(I2C0,&I2INIT);

  ////////////////RTC config//////////////

  RTC_Init(&RTCINI);

  RTC_CompareSet(0, 30000);

  RTC_IntEnable(RTC_IFC_COMP0);

  RTC_Enable(true);

  GPIO_PinModeSet(5,5,gpioModePushPull,0);//test led

  GPIO_PinModeSet(0,2,gpioModeInput ,0);//RDY

  while (1)

  {

   NVIC_EnableIRQ(RTC_IRQn);

   powerup();// der Sensor wird aktiviert

   while(GPIO_PinInGet(0,2)==1){}// wait till data ready to read

   measureTemp();//Misst die Temperatur 

   if(Temp>28)

     {

      GPIO_PinOutSet(5,5);

        }else{

      GPIO_PinOutClear(5,5);

     }

     powerdown();// der Sensor geht in Stand By

  EMU_EnterEM2(1);

}

}

///RTC Interrupt

void RTC_IRQHandler(void) {

    RTC_IntClear(RTC_IFC_COMP0);

    RTC_CompareSet(0, 30000);

    RTC_IntEnable(RTC_IFC_COMP0);

}