STM32F4 - HAL_Delay() not working correctly after waking from Stop mode

[sugah]

Hi everyone,

I'm working on a project using the STM32F4 series with STM32CubeIDE. After the MCU wakes up from Stop mode, HAL_Delay() seems to get stuck and the program doesn't proceed as expected.

I've already re-initialized SysTick after wake-up, but the issue still persists. Has anyone run into this before? Would appreciate any pointers on what might be missing in the clock/SysTick reconfiguration after Stop mode exit.

Thanks in advance!

[Gyessine]

Hello ​@sugah 
Did you call SystemClock_Config to configure the clock again after waking up from Stop mode?
Entering Stop mode halts the core, so after waking up, reconfiguring the system clock by calling the SystemClock_Config function is needed.
BR
Gyessine

[Saket_Om]

Hello ​@sugah 

Did you clear the PWR_FLAG_WU flag after wakeup?

Please refer to the example below:

STM32CubeF4/Projects/STM32469I-Discovery/Examples/PWR/PWR_STOP at master · STMicroelectronics/STM32CubeF4

[Dor_RH]

Hello ​@sugah,

You might find this ST Wiki page very helpful for your issue: Getting started with PWR 

It covers the full Stop mode entry/exit flow with code examples, including the HAL_SuspendTick / HAL_ResumeTick pattern and what needs to be done after wake-up to get the system clock and SysTick running correctly again.