VCOM with USB-CDC

[sabdulqadir]

Hi,
Had a rookie question about having multiple vcom ports using CDC. Can I combine the interrupt endpoints for 2 vcom ports to save an end-point?

thanks,
aQ

[Giovanni]

Hi,

Not sure, you should try and see how the host takes it.

The demo STM32F4xx-USB_CDC_IAD should allow to test it quickly in usbcfg.h.

Giovanni

[sabdulqadir]

Ok,
I was able to get 3 vitural com ports. Just for anyone who may need it
AQ

[FXCoder]

Hi,
Looks useful.
What host OS did you try this with?
--
Bob

[sabdulqadir]

Hi,
Looks useful.
What host OS did you try this with?
--
Bob

Win10. I think also works with Win7. I remember testing with one of the PC that had Win7.

[FXCoder]

Thanks.
My experience with a config for 2 x VCP was that Win10, Mac and Linux were good. However, Win7 VCP driver only saw one com port.
I may try your single interrupt endpoint approach and see if Win7 behaves differently.
Care to post you usbcfg.c & .h ?

[sabdulqadir]

Thanks.
My experience with a config for 2 x VCP was that Win10, Mac and Linux were good. However, Win7 VCP driver only saw one com port.
I may try your single interrupt endpoint approach and see if Win7 behaves differently.
Care to post you usbcfg.c & .h ?

Sure.
BTW, I have used two com ports with Win7 without any issues. My comment was for 3 com ports on Win7.
AQ

I could not attach files here. Webpage complained about invalid file formats. Ill try to send them through private msg.

[FXCoder]

Hi AQ,
Files retrieved OK.
FYI to post attachments on the forum use a zip.

I'll try out your configs later today on an F413 and see how I go getting additional VCPs, Win versus Win10 etc.

Thanks.
--
Bob