Is there any driver needed for Composite USB class??

[NK]

Composite USB class device is not detected. It always shows device descriptor failed error.

Composite USB class (MSC+ CustomHID)

[TDK]

I don't think you need a custom driver for the composite class, just the individual ones, unless they also use built-in drivers. Not 100% sure on that.

I'd use Wireshark/USBPcap to figure out what's happening on the bus. Device descriptor failed sounds like the device isn't even sending a response to the request, not that a driver doesn't exist.

[Tesla DeLorean]

>>Device descriptor failed sounds like the device isn't even sending a response to the request..

I'd probably focus on validating the integrity of the descriptor, if it's not constructed properly it is going to get ignored/rejected. Check that it is being requested/sent from the device side.

[NK]

Thank you TDK.

Yes, as you say like device is unable to send response to the host request..the enumeration itself failed.

Actually I am new to this and i am not able to understand for composite class specific to MSC+CustomHID, what are the device descriptors??

Right now I am working on STM32L4R5ZI board and I passed MSC class device descriptor.

VID: 1155

PID: 22314

Could you please suggest me what device descriptor should I used?? Or for composite class how we can get VID and PID which combine both the classes??

Thank you.

[NK]

Thank you clive1.

Could please tell me that how I can check whether the response is sent by device or not??

It would be a great help,as I am totally new to this and not understanding it how should I proceed to debug this problem??

#define USB_MSC_CUSTOMHID_INTERFACE_NBR      2

#define USB_CUSTMHID_INTERFACE            0

#define USB_MSC_INTERFACE              1

#define MSC_EPIN_NUM             0x02

#define MSC_EPIN_ADDR            0x82

#define MSC_EPOUT_NUM            0x02

#define MSC_EPOUT_ADDR            0x02

#define CUSTOM_HID_EPIN_NUM         0x01

#define CUSTOM_HID_EPIN_ADDR         0x81

#define CUSTOM_HID_EPIN_SIZE         0x02

#define CUSTOM_HID_EPOUT_NUM         0x01

#define CUSTOM_HID_EPOUT_ADDR        0x01

#define CUSTOM_HID_EPOUT_SIZE        0x02

Descriptors are as follows:

Device descriptor:

 0x12,            /*bLength */

 USB_DESC_TYPE_DEVICE,    /*bDescriptorType*/

 0x02,

 0x00,            /*bDeviceClass*/

 0x00,            /*bDeviceSubClass*/

 0x00,            /*bDeviceProtocol*/

 USB_MAX_EP0_SIZE,      /*bMaxPacketSize*/

 LOBYTE(USBD_VID),      /*idVendor*/

 HIBYTE(USBD_VID),      /*idVendor*/

 LOBYTE(USBD_PID_FS),    /*idProduct*/

 HIBYTE(USBD_PID_FS),    /*idProduct*/

 0x00,            /*bcdDevice rel. 2.00*/

 0x02,

 USBD_IDX_MFC_STR,      /*Index of manufacturer string*/

 USBD_IDX_PRODUCT_STR,    /*Index of product string*/

 USBD_IDX_SERIAL_STR,    /*Index of serial number string*/

 USBD_MAX_NUM_CONFIGURATION /*bNumConfigurations*/

Configuration descriptor:

 0x09,  /* bLength: Configuation Descriptor size */

 USB_DESC_TYPE_CONFIGURATION,  /* bDescriptorType: Configuration */

 LOBYTE(USB_MSC_CUSTOMHID_CONFIG_DESC_SIZ), /* wTotalLength in byte */

 HIBYTE(USB_MSC_CUSTOMHID_CONFIG_DESC_SIZ),

 USB_MSC_CUSTOMHID_INTERFACE_NBR,  /* bNumInterfaces: 2 interface */

 0x01,  /* bConfigurationValue: */

 0x04,  /* iConfiguration: */

 0xC0,  /* bmAttributes: */

 0x32,  /* MaxPower 100 mA */

Is there anything missing or wrong in descriptors?

Thank you.