A USB Composite Device is a USB Device which uses more than one USB class.
In this use case, the "USB HID Generic (Composite Device)" module is used to create a USB composite device. Thus, this USB module can be associated with another "Composite Device" module, like "USB MSC (Composite Device)".
Also, you can refer to application note AVR4902 ASF - USB Composite Device.
Setup steps
For the setup code of this use case to work, the basic use case must be followed.
Usage steps
Example code
Content of conf_usb.h:
#define USB_DEVICE_EP_CTRL_SIZE 64
#define USB_DEVICE_NB_INTERFACE (X+1)
#define USB_DEVICE_MAX_EP (X+2)
#define UDI_HID_GENERIC_EP_IN (1 | USB_EP_DIR_IN)
#define UDI_HID_GENERIC_EP_OUT (2 | USB_EP_DIR_OUT)
#define UDI_HID_GENERIC_IFACE_NUMBER X
#define UDI_COMPOSITE_DESC_T \
udi_hid_generic_desc_t udi_hid_generic; \
...
#define UDI_COMPOSITE_DESC_FS \
.udi_hid_generic = UDI_HID_GENERIC_DESC, \
...
#define UDI_COMPOSITE_DESC_HS \
.udi_hid_generic = UDI_HID_GENERIC_DESC, \
...
#define UDI_COMPOSITE_API \
&udi_api_hid_generic, \
...
Workflow
- Ensure that conf_usb.h is available and contains the following parameters required for a USB composite device configuration:
#define USB_DEVICE_EP_CTRL_SIZE 64
#define USB_DEVICE_NB_INTERFACE (X+1)
#define USB_DEVICE_MAX_EP (X+2)
- Ensure that conf_usb.h contains the description of composite device:
#define UDI_HID_GENERIC_EP_IN (1 | USB_EP_DIR_IN)
#define UDI_HID_GENERIC_EP_OUT (2 | USB_EP_DIR_OUT)
#define UDI_HID_GENERIC_IFACE_NUMBER X
- Ensure that conf_usb.h contains the following parameters required for a USB composite device configuration:
#define UDI_COMPOSITE_DESC_T \
...
...
#define UDI_COMPOSITE_DESC_FS \
...
...
#define UDI_COMPOSITE_DESC_HS \
...
...
#define UDI_COMPOSITE_API \
...
...
- Note
- The descriptors order given in the four lists above must be the same as the order defined by all interface indexes. The interface index orders are defined through UDI_X_IFACE_NUMBER defines.