Question
STM32L1 cant enter lowpower sleep
Posted on July 26, 2017 at 17:59
Hello everybody.
I simply can not figure out the settings needed for lowpower sleep. I am aware of fact, that i need to enter lowpower run first. My setup: - MSI 1048KHz- PWR Reg Voltage Scale Scale 2
- TIM3 counter period 1048 (1ms) /TIM3 global interrupt enabled
- GPIO output PA4 (for debug pin toggle)
Unfortunately, my code goes into
void HardFault_Handler(void)
when i get toHAL_PWR_EnterSLEEPMode(PWR_LOWPOWERREGULATOR_ON, PWR_SLEEPENTRY_WFI);
What am I missing? with MAINREGULATOR_ON it works fine ... but thats not a lowpower sleep right?
CODE:
/* USER CODE BEGIN 2 */
HAL_TIM_Base_Start_IT(&htim3);
HAL_Delay(500);
HAL_PWREx_EnableLowPowerRunMode();
while(__HAL_PWR_GET_FLAG(PWR_FLAG_REGLP) == RESET){
HAL_Delay(1);
}
HAL_SuspendTick();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
HAL_GPIO_TogglePin(S1_GPIO_Port,S1_Pin);
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
//enter sleep mode and wait for interrupt
HAL_PWR_EnterSLEEPMode(PWR_LOWPOWERREGULATOR_ON, PWR_SLEEPENTRY_WFI);
// HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
}
/* USER CODE END 3 */�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?�?