UM10375 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
User manual Rev. 3 — 14 June 2011 175 of 368
NXP Semiconductors
UM10375
Chapter 11: LPC13xx USB on-chip drivers
11.6 USB descriptors
The USB driver reports several predefined descriptors during enumeration of the HID or
MSC device types. Certain fields of the descriptor are user-defined.
11.6.1 Standard descriptor
The USB driver reports the following predefined descriptor during enumeration of the HID
or MSC device. Fields in bold are user-defined.
Standard descriptors are combined in one string and the offset is fixed. iManufacture,
iProduct, and iSerialNumber strings must be of fixed size. See Section 11.6.4
for HID and
MSC descriptor examples.
SampleInterval Interrupt endpoint (IN and OUT) sample interval in ms.
InReport InReport call back function. This function is provided by the application
software. This function gets called when host sends a InReport command.
Input Parameters:
Source Pointer – Pointer to the destination of data
Length – Number of bytes to be read
OutReport OutReport call back function. This function is provided by the application
software. This function gets called when host sends a OutReport command.
Input Parameters:
Source Pointer – Pointer to the source of data
Length – Number of bytes to be written
Table 188. Human interface device information class structure
Member Description
Table 189. Standard descriptor
Field Value Description
bLength 0x12 Descriptor size in bytes
bDescriptorType 0x01 The constant Device (01h)
bcdUSB 0x0200 USB Specification release number (BCD)
bDeviceClass 0x00 Class Code
bDeviceSubClass 0x00 Subclass code
bDeviceProtocol 0x00 Protocol Code
bMaxPacketSize0 0x40 Maximum Packet size for endpoint 0
idVendor User Defined Vendor ID (Provided by the Application Software)
idProduct User Defined Product ID (Provided by the Application Software)
bcdDevice User Defined Device Release number
iManufacturer 0x04 Index of string descriptor for the manufacturer (fixed size)
iProduct 0x20 Index of string descriptor for the product (fixed size)
iSerialNumber 0x48 Index of string descriptor containing the serial number
(fixed size)
bNumConfigurations 0x01 Number of possible configurations
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