Posted on May 31, 2018 at 11:19My 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 */
__HAL_RCC_PWR_CLK_ENABLE();
/* Enable Ultra low power mode */
HAL_PWREx_EnableUltraLowPower();
HAL_PWREx_DisableFastWakeUp();
/* Select HSI as system clock source after Wake Up from Stop mode */
__HAL_RCC_WAKEUPSTOP_CLK_CONFIG (RCC_STOP_WAKEUPCLOCK_HSI);
}
Don't know the root-cause.
