STM32U3 Doesnt enter STOP Mode

[vtsiam]

Hi, I am using a STM32U375KEU on a custom PCB and I am trying to enter STOP2 mode. When flashing the code i the error: Target is not responding, retrying… and the current draw is the same as running the MCU normally at around 2mA. Here is the main

int main(void)

{

HAL_Init();

SystemClock_Config();

 

HAL_DBGMCU_DisableDBGStopMode();

 

// 3. KILL SYSTICK SO IT CAN'T WAKE THE CPU

HAL_SuspendTick();

SCB->ICSR |= SCB_ICSR_PENDSTCLR_Msk;

 

// 4. ENTER DEEP SLEEP

__HAL_PWR_CLEAR_FLAG(PWR_FLAG_SBF);

HAL_PWR_EnterSTOPMode(PWR_LOWPOWERMODE_STOP1, PWR_STOPENTRY_WFI);

 

// 5. IF IT WAKES UP, TRAP IT HERE

while (1)

{

}

}

}

Does it have something to do with the Clock?

[Gyessine]

Hello ​@vtsiam 
First, to ensure if it is a software or hardware issue
can you try run this firmware example, it should work on your MCU
or you can base yourself on it to create a working project
So, we can see if it is an issue related to your code or an issue related to your hardware
BR
Gyessine

[vtsiam]

Hi, I tested the board based on the code you send. In the first 5 seconds of the HAL_Delay I measure 3.6mA and after when i enter STOP 2 Mode i measure 2mA current. The board also has a sensor with I2C, a IC with SPI and some LEDs but i have unssoldered them all and set all the GPIO pins including the debugging ones to analog.