EFM32 Timer pulse generate with & without IRQ

// with IRQ (GPIO output)

/**************************************************************************//**
 * @brief TIMER0_IRQHandler
 * Interrupt Service Routine TIMER0 Interrupt Line
 *****************************************************************************/
void TIMER0_IRQHandler(void)
{
  /* Clear flag for TIMER0 overflow interrupt */
  TIMER_IntClear(TIMER0, TIMER_IF_OF);

  /* Toggle LED ON/OFF */
  GPIO_PinOutToggle(gpioPortC, 0);
}
/**************************************************************************//**
 * @brief  Main function
 * Main is called from __iar_program_start, see assembly startup file
 *****************************************************************************/
int main(void)
{
  /* Initialize chip */
  CHIP_Init();
 
  /* Enable clock for GPIO module */
  CMU_ClockEnable(cmuClock_GPIO, true);

  /* Enable clock for TIMER0 module */
  CMU_ClockEnable(cmuClock_TIMER0, true);

  /* Configure pin as push pull output for LED/pin drive */
  GPIO_PinModeSet(LED_PORT, LED_PIN, gpioModePushPullDrive, 0);

  /* Select TIMER0 parameters */
  TIMER_Init_TypeDef timerInit =
  {
    .enable     = true,
    .debugRun   = true,
    .prescale   = timerPrescale1024,
    .clkSel     = timerClkSelHFPerClk,
    .fallAction = timerInputActionNone,
    .riseAction = timerInputActionNone,
    .mode       = timerModeUp,
    .dmaClrAct  = false,
    .quadModeX4 = false,
    .oneShot    = false,
    .sync       = false,
  };

  /* Enable overflow interrupt */
  TIMER_IntEnable(TIMER0, TIMER_IF_OF);

  /* Enable TIMER0 interrupt vector in NVIC */
  NVIC_EnableIRQ(TIMER0_IRQn);

  /* Set TIMER Top value */
  TIMER_TopSet(TIMER0, TOP);

  /* Configure TIMER */
  TIMER_Init(TIMER0, &timerInit);

  while(1)
  {
    /* Go to EM1 */
    EMU_EnterEM1();
  }

}


//without IRQ (TIMER output)

/**************************************************************************//**
 * @brief  Main function
 * Main is called from __iar_program_start, see assembly startup file
 *****************************************************************************/
int main(void)
{
  /* Initialize chip */
  CHIP_Init();
   
  /* Enable clock for GPIO module */
  CMU_ClockEnable(cmuClock_GPIO, true);
 
  /* Enable clock for TIMER0 module */
  CMU_ClockEnable(cmuClock_TIMER0, true);
 
  /* Set CC0 location 3 pin (PD1) as output */
  GPIO_PinModeSet(gpioPortD, 1, gpioModePushPull, 0);

  /* Select CC channel parameters */
  TIMER_InitCC_TypeDef timerCCInit =
  {
    .cufoa      = timerOutputActionNone,
    .cofoa      = timerOutputActionToggle,
    .cmoa       = timerOutputActionNone,
    .mode       = timerCCModeCompare,
    .filter     = true,
    .prsInput   = false,
    .coist      = false,
    .outInvert  = false,
  };
 
  /* Configure CC channel 0 */
  TIMER_InitCC(TIMER0, 0, &timerCCInit);

  /* Route CC0 to location 3 (PD1) and enable pin */
  TIMER0->ROUTE |= (TIMER_ROUTE_CC0PEN | TIMER_ROUTE_LOCATION_LOC3);
 
  /* Set Top Value */
  TIMER_TopSet(TIMER0, TOP);
 
  /* Select timer parameters */
  TIMER_Init_TypeDef timerInit =
  {
    .enable     = true,
    .debugRun   = true,
    .prescale   = timerPrescale64,
    .clkSel     = timerClkSelHFPerClk,
    .fallAction = timerInputActionNone,
    .riseAction = timerInputActionNone,
    .mode       = timerModeUp,
    .dmaClrAct  = false,
    .quadModeX4 = false,
    .oneShot    = false,
    .sync       = false,
  };
 
  /* Configure timer */
  TIMER_Init(TIMER0, &timerInit);
 
  while(1)
  {
    /* Go to EM1, while TIMER tuns compare output */
    EMU_EnterEM1();
  }
 
}