System supply configuration: set LDO Supply in STM32CubeIDE

[TBend.3]

Hello,

I have designed my own board with a STM32H7 MCU and set the "System supply configuration" to "1. LDO Supply selected" (see picture).

In the STM32CubeIDE in the IOC file under the item System Core - RCC the SupplySource is set to PWR_LDO_SUPPLY. 

After that the STM32CubeIDE generates a code and at system start the device hangs at point:

/** Supply configuration update enable
*/
HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);

in an infinite loop, because the PWR_FLAG_ACTVOSRDY flag is apparently not set. 

/* Wait till voltage level flag is set */
while (__HAL_PWR_GET_FLAG (PWR_FLAG_ACTVOSRDY) == 0U)
{
if ((HAL_GetTick () - tickstart) > PWR_FLAG_SETTING_DELAY)
{
return HAL_ERROR;
}
}

if I disable the function

HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);

the system works for now but as soon as I call the function "HAL_Delay" the system does not respond anymore.

How do I configure the system correctly?

Thanks and best regards Thomas

[AScha.3]

for useful answer it could help, to give the exact cpu type.... :)

[FBL]

Hello @TBend.3 

Adding to @AScha.3 suggestion, would you please precise the voltage scaling? 

Could you explain the usage of PWR_FLAG_ACTVOSRDY? 

Would you try as follows:

 while (__HAL_PWR_GET_FLAG (PWR_FLAG_VOSRDY) == 0U)

Hope this helps!

[TBend.3]

Hi ASch.3,

thanks for your quick reply, the MCU is a STM32H730ABI6Q.

Thanks and best regards
Thomas

[TBend.3]

Thank you for your reply,

I use only 3V3 on the board for the VDD pins of the MCU and for the VDDLDO pins.
VDDA is via ferrite bead on 3V3 net and the VREF+ there is still a resistor to the VDDA, so also everything on 3V3.
In the STM32CubeIDE I use an empty project with an "empty" IOC file and then I generate a code from the IOC file where the above mentioned error occurs.

Thanks and best regards Thomas

[AScha.3]

i made some boards with STM cpu, F030 ...also H7A3 , H733, H743 , never such problems.

BUT i also never use a HxxxQ, the smps version, to avoid problems . :)

special joke: buy a cpu with onchip smps, but not use smps . on some H7 is not working...but i am not sure.

AND never try cpu with "empty" ioc file. minimum is : error free clock tree, debug swd enable, useful settings for power, rcc, core, systick . if power on ALL vdd/gnd pins and 2u caps on vcap - cpu will run.

(but dont use/activate rtc, 32khz lse - this may bring new surprise.)