why external crystal oscillator not working in STM32H7?

[VPras]

Hi,

I am using STM32H7 Nucleo board. I soldered an external 25MHz crystal oscillator with 22 pf capacitors(Load capacitance of crystal =20pf) but the controller doesn't seem to work on 25Mhz crystal oscillator. I tested this by blinking an LED at 1 seconds but it is taking much longer time than usual. Also i tried replacing the crystal. although the internal oscillator HSI works fine. what could be the issue ?

Thanks

Vimal

[waclawek.jan]

Isn't there a solder bridge from the STLink's MCO, which has to be disconnected?

Refer to the Nucleo schematics/manual.

JW

[VPras]

Thank you. Issue is solved

[waclawek.jan]

Can you please tell us what was the problem?

JW