Get descriptors from a USB device.

int32_t UsbGetDescriptor( 
    int32_t udev, 
    uint8_t desctype, 
    uint8_t descindex, 
    uint16_t langid, 
    void *buf, 
    uint16_t size 
); 

Parameters

udev

Device handle from UsbOpenDevice.

desctype 

Type of descriptor, one of:
#define USB_DT_DEVICE 0x01
#define USB_DT_CONFIG 0x02
#define USB_DT_STRING 0x03
#define USB_DT_INTERFACE 0x04
#define USB_DT_ENDPOINT 0x05
#define USB_DT_DEVICE_QUALIFIER 0x06
#define USB_DT_OTHER_SPEED_CONFIG 0x07
#define USB_DT_INTERFACE_POWER 0x08  

descindex

Descriptor number 0 .. N .

langid 

Language ids available at www.usb.org. Use zero for the default language .

buf 

Pointer to destination buffer for the descriptor.

size 

Size of the destination buffer. Should be at least as large as a descriptor of desctype.  

Return Values

USB_ERR_NORMAL_COMPLETION	Success.
USB_ERR_NO_STACK	The USB stack is not ready.
USB_ERR_MEMORY	Memory could not be allocated for the operation.
USB_ERR_TIMEOUT	The device did not respond.

Requirements