LPTIM1 not running

Hello,

I'm using the STM32H750VB and want to use the LPTIM1 to wakeup for CSTOP.

But i'm not able to let the LPTIM1 run.

Code:

  SysInt_RegisterIsr(WAKEUP_PIN_IRQn, WakeUpPinInterrupt);

  SysInt_SetPriority(WAKEUP_PIN_IRQn, 1, 0);

  SysInt_EnableIsr(WAKEUP_PIN_IRQn);

  SysInt_RegisterIsr(LPTIM1_IRQn, LowPowerTimerInterupt);

  SysInt_SetPriority(LPTIM1_IRQn, 0, 0);

  SysInt_EnableIsr(LPTIM1_IRQn);

  LSI_ClockEnable();

  /* ### - 1 - Re-target the LSI to Clock the LPTIM Counter ################# */

  /* Select the LSI clock as LPTIM peripheral clock */

  RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LPTIM1;

  RCC_PeriphCLKInitStruct.Lptim1ClockSelection = RCC_LPTIM1CLKSOURCE_LSI;

  HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphCLKInitStruct);

  LptimHandle.Instance = LPTIM1;

  LptimHandle.Init.Clock.Source    = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;

  LptimHandle.Init.Clock.Prescaler  = LPTIM_PRESCALER_DIV16;

  LptimHandle.Init.Trigger.Source   = LPTIM_TRIGSOURCE_0;

  LptimHandle.Init.Trigger.ActiveEdge = LPTIM_ACTIVEEDGE_RISING;

  LptimHandle.Init.CounterSource   = LPTIM_COUNTERSOURCE_INTERNAL;

  LptimHandle.Init.Input1Source    = LPTIM_INPUT1SOURCE_GPIO;

  LptimHandle.Init.Input2Source    = LPTIM_INPUT2SOURCE_GPIO;

  /* Initialize LPTIM peripheral according to the passed parameters */

  HAL_LPTIM_Init(&LptimHandle);

  /* Period = 65535

  * Pulse = 32767

  * According to this configuration (LPTIMER clocked by LSI & compare = 32767,

  * the Timeout period = (compare + 1)/LSI_Frequency = 1s

  */

  HAL_LPTIM_TimeOut_Start_IT(&LptimHandle, 0xFFFF, 0x8000);