STM32 Core not recognized (WinXP)

[Trantuete]

Hi,

my first post here in the forum...let's start with a problem. If found similar topics in the forum, but my issue is a bit different.

I finished my STM32 Core Module with my own PCB design. PCB is OK, everything I tested seems to work so far. BUT, when connecting it via USB to my WinXP computer, it's not recognized. I get the message that the device connected to the usb port was not installed properly and may not work. Then it's listed as "unknown device". I tried it in Bootloader Hold Mode, but same problem.

I'm usig a STM32RCT6 runnig with a 8 MHz crystal. I flashed it via SWD with a STLink device.

Is there anything I have to change in the software or configuration?

Any ideas?

I appreciate every reply

regards

[Shuriken]

Doesn't the STM32 Core use a 12Mhz crystal? Maybe you could have a search for that on the forum.

[Trantuete]

Hi,

thanks for the quick reply.

The datasheet of the STM32 says: "The high-speed external (HSE) clock can be supplied with a 4 to 16 MHz crystal/ceramic resonator oscillator." So this should be no problem.

Unfortunately I've got no 12MHz Crystal at hand to test it.

Regards

[Trantuete]

O.K. I will get myself a 12 MHz crystal and try.

The µC might accept 8 MHz crystals but I guess the software configures it for 12. I'm not that much of a software shark, you know....

[Shuriken]

Yeah, that should do the trick. on a similar problem

[Trantuete]

Thanks for your help so far. I'll be back for sure if something else doesn't work....

PS: did you know, that Arnold Schwarzenegger at first did not want to say that: "I'll be back"? He thought it sounded too feminine....little side information....unnecessary but funny...

[TK.]

Shiruken is right: It will only work with a 12 MHz crystal, because the PLL is configured accordingly.

Best Regards, Thorsten.

[Trantuete]

Works! Thank You...

Regards

Simon