Dialog Semiconductor customer support - cdc usb subclass https://support.dialog-semiconductor.com/resource-keywords/cdc-usb-subclass en USB CDC Device Descriptor SubClass is set wrong https://support.dialog-semiconductor.com/forums/post/dialog-smartbond-bluetooth-low-energy-%E2%80%93-software/usb-cdc-device-descriptor-subclass-set
Forums: 
Dialog Smartbond Bluetooth Low Energy – Software

When using the USB cdc there USB_CDC.h have the following config defaults:

#define CDC_USB_CLASS 2 // 2: Communication Device Class

#define CDC_USB_SUBCLASS 0x00 //

#define CDC_USB_PROTOCOL 0x00 //

But they are not used, when sniffing the usb connection the Device Descriptor package looks like this: 12 01 00 02 02 02 00 08 CF 2D 02 60 00 01 01 02 03 01 translated to:

12 Length

01 Device Descriptors

00 bcdUSB

02 bcdUSB

02 bDeviceClass

02 bDeviceSubClass

00 bDeviceProtocol

…

Giving a SubClass of 0x02 this is not a valid value, according to https://www.usb.org/defined-class-codes both subclass and protocol can only be set to 0x00.

Are there any way of setting the subclass field?

Keywords: 
cdc usb subclass
Device: 
DA1468x
 Wed, 12 Feb 2020 15:21:15 +0000 JPetersen 343651 at https://support.dialog-semiconductor.com https://support.dialog-semiconductor.com/forums/post/dialog-smartbond-bluetooth-low-energy-%E2%80%93-software/usb-cdc-device-descriptor-subclass-set#comments