My current project using STM32L071RB chip, and now encounter a strange issue, when I enable PWR_CR ULP bit thr "HAL_PWREx_EnableUltraLowPower()", the systick (Using TIM2 as timebase) become slow. and if I disable ULP bit, systick will be back to normal.
following is my power method, before enter STOP mode, I will call this method, and after wake-up from STOP, the HAL_getTick() will become very slow.
static void SystemPower_Config(void)
/* Enable Power Control clock */
/* Enable Ultra low power mode */
/* Select HSI as system clock source after Wake Up from Stop mode */
Don't know the root-cause.