NUCLEO-H7S3L8 HSE times out

[qua]

I am trying to set up a basic USB project on a NUCLEO-H7S3L8. It works okay with the HSI, but I need the HSE. I can see that the board has a 24MHz crystal fitted and resistors on SB14 and SB15. It's unmodified from the factory.

HAL_RCC_OscConfig() always returns with a timeout when trying to activate the HSE. I've tried various settings but can't get it to work.

I have attached my .ico file. The code is just what CubeMX generates. Thanks.

[AScha.3]

Did you set it like this ?

+ in clock tree set the 24M

It should work then. (My H7S3 does.)

[qua]

Looks like it is set correctly.

[AScha.3]

Did you set it like this ?

... and USB:

[qua]

[AScha.3]

So to check, the HSE crystal is ok , running, do a simple test:

make new -> stm32 project -> select just the H7S3L8H cpu -> give it a name, finish.

Then

- set only for "boot" , so its all in flash

- set RCC HSE , LDO, scale0

- set HSE 24M , clock tree to 600M core, etc.

- set debug trace async

- cortexM7 all caches on

(if you like, set port pin toggle an onboard led)

- generate code

- compile + debug

-- it should run (mine does).