USB composite device CDC+HID

[SS.Sagar]

Posted on April 19, 2018 at 18:11

Hi,

i have working HID example with me. But i was trying to integrate CDC class in the existing HID class. I am using cubemx code. After initializing and flashing i got the error as 'Device Descriptor Request Failed' .

I am confused to initialize the USB driver for HID and CDC as well at the same time.  

Is it fine if i initialize the code for HID and CDC separately? 

Or i will have to initialize both code at the same time. 

Do i have to use different USB structure that is USBD_ClassTypeDef . ?

Here is my usb descriptor file.

/* USB HID device Configuration Descriptor */

__ALIGN_BEGIN static uint8_t USBD_HID_CfgDesc[USB_HID_CONFIG_DESC_SIZ] __ALIGN_END ={ 0x09, /* bLength: Configuration Descriptor size */ USB_DESC_TYPE_CONFIGURATION, /* bDescriptorType: Configuration */ USB_HID_CONFIG_DESC_SIZ, /* wTotalLength: Bytes returned */ 0x00, 0x03, /*bNumInterfaces: 1 interface*/ 0x01, /*bConfigurationValue: Configuration value*/ 0x00, /*iConfiguration: Index of string descriptor describing the configuration*/ 0xE0, /*bmAttributes: bus powered and Support Remote Wake-up */ 0x32, /*MaxPower 100 mA: this current is used for detecting Vbus*/ /************** Descriptor of Keyboard interface ****************/ /* 09 */ 0x09, /*bLength: Interface Descriptor size*/ USB_DESC_TYPE_INTERFACE,/*bDescriptorType: Interface descriptor type*/ 0x00, /*bInterfaceNumber: Number of Interface*/ 0x00, /*bAlternateSetting: Alternate setting*/ 0x01, /*bNumEndpoints*/ 0x03, /*bInterfaceClass: HID*/ 0x01, /*bInterfaceSubClass : 1=BOOT, 0=no boot*/ 0x01, /*nInterfaceProtocol : 0=none, 1=keyboard, 2=mouse*/ // KEYBOARD 0, /*iInterface: Index of string descriptor*/ /******************** Descriptor of Keyboard HID ********************/ /* 18 */ 0x09, /*bLength: HID Descriptor size*/ HID_DESCRIPTOR_TYPE, /*bDescriptorType: HID*/ 0x11, /*bcdHID: HID Class Spec release number*/ 0x01, 0x00, /*bCountryCode: Hardware target country*/ 0x01, /*bNumDescriptors: Number of HID class descriptors to follow*/ 0x22, /*bDescriptorType*/ HID_KEYBOARD_REPORT_DESC_SIZE,/*wItemLength: Total length of Report descriptor*/ 0x00, /******************** Descriptor of endpoint ********************/ /* 27 */ 0x07, /*bLength: Endpoint Descriptor size*/ USB_DESC_TYPE_ENDPOINT, /*bDescriptorType:*/ HID_EPIN_ADDR, /*bEndpointAddress: Endpoint Address (IN)*/ 0x03, /*bmAttributes: Interrupt endpoint*/ HID_EPIN_SIZE, /*wMaxPacketSize: 4 Byte max */ 0x00, HID_FS_BINTERVAL, /*bInterval: Polling Interval (10 ms)*/ /* 34 */ /******** /IAD should be positioned just before the CDC interfaces ****** IAD to associate the two CDC interfaces */

0x08, /* bLength */

0x0B, /* bDescriptorType */ 0x01, /* bFirstInterface */ 0x02, /* bInterfaceCount */ 0x02, /* bFunctionClass */ 0x00, /* bFunctionSubClass */ 0x01, /* bFunctionProtocol */ 0x00, /* iFunction (Index of string descriptor describing this function) */

/*Interface Descriptor */

0x09, /* bLength: Interface Descriptor size */ USB_DESC_TYPE_INTERFACE, /* bDescriptorType: Interface */ /* Interface descriptor type */ 0x01, /* bInterfaceNumber: Number of Interface */ 0x00, /* bAlternateSetting: Alternate setting */ 0x01, /* bNumEndpoints: One endpoints used */ 0x02, /* bInterfaceClass: Communication Interface Class */ 0x02, /* bInterfaceSubClass: Abstract Control Model */ 0x01, /* bInterfaceProtocol: Common AT commands */ 0x00, /* iInterface: */ /*Header Functional Descriptor*/ 0x05, /* bLength: Endpoint Descriptor size */ 0x24, /* bDescriptorType: CS_INTERFACE */ 0x00, /* bDescriptorSubtype: Header Func Desc */ 0x10, /* bcdCDC: spec release number */ 0x01, /*Call Management Functional Descriptor*/ 0x05, /* bFunctionLength */ 0x24, /* bDescriptorType: CS_INTERFACE */ 0x01, /* bDescriptorSubtype: Call Management Func Desc */ 0x00, /* bmCapabilities: D0+D1 */ 0x01, /* bDataInterface: 1 */ /*ACM Functional Descriptor*/ 0x04, /* bFunctionLength */ 0x24, /* bDescriptorType: CS_INTERFACE */ 0x02, /* bDescriptorSubtype: Abstract Control Management desc */ 0x02, /* bmCapabilities */ /*Union Functional Descriptor*/ 0x05, /* bFunctionLength */ 0x24, /* bDescriptorType: CS_INTERFACE */ 0x06, /* bDescriptorSubtype: Union func desc */ 0x00, /* bMasterInterface: Communication class interface */ 0x01, /* bSlaveInterface0: Data Class Interface */ /*Endpoint 2 Descriptor*/ 0x07, /* bLength: Endpoint Descriptor size */ USB_DESC_TYPE_ENDPOINT, /* bDescriptorType: Endpoint */ CDC_CMD_EP, /* bEndpointAddress */ 0x03, /* bmAttributes: Interrupt */ LOBYTE(CDC_CMD_PACKET_SIZE), /* wMaxPacketSize: */ HIBYTE(CDC_CMD_PACKET_SIZE), 0x10, /* bInterval: */ /*---------------------------------------------------------------------------*/ /*Data class interface descriptor*/ 0x09, /* bLength: Endpoint Descriptor size */ USB_DESC_TYPE_INTERFACE, /* bDescriptorType: */ 0x02, /* bInterfaceNumber: Number of Interface */ 0x00, /* bAlternateSetting: Alternate setting */ 0x02, /* bNumEndpoints: Two endpoints used */ 0x0A, /* bInterfaceClass: CDC */ 0x00, /* bInterfaceSubClass: */ 0x00, /* bInterfaceProtocol: */ 0x00, /* iInterface: */ /*Endpoint OUT Descriptor*/ 0x07, /* bLength: Endpoint Descriptor size */ USB_DESC_TYPE_ENDPOINT, /* bDescriptorType: Endpoint */ CDC_OUT_EP, /* bEndpointAddress */ 0x02, /* bmAttributes: Bulk */ LOBYTE(CDC_DATA_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */ HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE), 0x00, /* bInterval: ignore for Bulk transfer */ /*Endpoint IN Descriptor*/ 0x07, /* bLength: Endpoint Descriptor size */ USB_DESC_TYPE_ENDPOINT, /* bDescriptorType: Endpoint */ CDC_IN_EP, /* bEndpointAddress */ 0x02, /* bmAttributes: Bulk */ LOBYTE(CDC_DATA_HS_MAX_PACKET_SIZE), /* wMaxPacketSize: */ HIBYTE(CDC_DATA_HS_MAX_PACKET_SIZE), 0x00 /* bInterval: ignore for Bulk transfer */} ;

/* USB HID device Configuration Descriptor */

__ALIGN_BEGIN static uint8_t USBD_HID_Desc[USB_HID_DESC_SIZ] __ALIGN_END ={ /* 18 */ 0x09, /*bLength: HID Descriptor size*/ HID_DESCRIPTOR_TYPE, /*bDescriptorType: HID*/ 0x11, /*bcdHID: HID Class Spec release number*/ 0x01, 0x00, /*bCountryCode: Hardware target country*/ 0x01, /*bNumDescriptors: Number of HID class descriptors to follow*/ 0x22, /*bDescriptorType*/ HID_KEYBOARD_REPORT_DESC_SIZE,/*wItemLength: Total length of Report descriptor*/ 0x00,};

/* USB Standard Device Descriptor */

__ALIGN_BEGIN static uint8_t USBD_HID_DeviceQualifierDesc[USB_LEN_DEV_QUALIFIER_DESC] __ALIGN_END ={ USB_LEN_DEV_QUALIFIER_DESC, USB_DESC_TYPE_DEVICE_QUALIFIER, 0x00, 0x02, 0x00, 0x00, 0x00, 0x40, 0x01, 0x00,};#cubemx-stm32f103c8t6 #2-usb-descriptors #usb-composite

[SS.Sagar]

Posted on April 22, 2018 at 19:45

I am using STM32F103C8T6. 

[SS.Sagar]

Posted on May 06, 2018 at 21:34

Is USB IAD interface is required for composite device? 

Is it possible to use HID and CDC interface without use of IAD?

[Pavel A.]

Posted on May 06, 2018 at 23:22

Generally, not. A composite device can be defined without any IAD. AFAIK, only some specific classes make use of IAD.

-- pa

[Ben K]

Posted on May 07, 2018 at 16:03

CDC uses two interfaces (comm + data) for a single functionality, therefore these two need to be associated with an IAD in every case. The exception is when the device descriptor's {Class, Subclass, Protocol} are set the same as the comm interface: {2,2,1}.

[Tomas Long]

Posted on July 13, 2018 at 05:25

I'm also writing USB composite device CDC+HID(keyboard),but have some error, I used USB FS Lib 4.0.0,and STM32 StdPeriph Lib V3.5.0 .Have you solved that problem now,Can you give me your rountine for reference.Think you!

[Ben K]

Posted on July 13, 2018 at 10:59

First of all, reviving 5 year old posts where all of the participants are inactive in the new forum isn't likely to help, so please avoid this in the future.

As I said above, the libraries you are using aren't really suitable for customization, so I suggest you try different ones, such as one of the above suggestions.