AT90USB128X データシートの表示（PDF） - Atmel Corporation
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AT90USB128X Datasheet PDF : 28 Pages
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device that supports DFU is not capable of changing its mode of operation on its own. External
(human or host operating system) intervention is required.
4.2 DFU Specific Requests
In addition to the USB standard requests, 7 DFU class-specific requests are used to accomplish
the upgrade operations:
Table 4-1. DFU Class-specific Requests
bmRequestType
0010 0001b
0010 0001b
1010 0001b
1010 0001b
0010 0001b
1010 0001b
0010 0001b
bRequest
DFU_DETACH (0)
DFU_DNLOAD (1)
DFU_UPLOAD (2)
DFU_GETSTATUS (3)
DFU_CLRSTATUS (4)
DFU_GETSTATE (5)
DFU_ABORT (6)
wValue
wTimeout
wBlock
wBlock
Zero
Zero
Zero
Zero
wIndex
Interface (4)
Interface (4)
Interface (4)
Interface (4)
Interface (4)
Interface (4)
Interface (4)
wLength
Zero
Length
Length
6
Zero
1
Zero
Data
none
Firmware
Firmware
Status
none
State
none
4.3 DFU Descriptors Set
The device exports the DFU descriptor set, which contains:
• A DFU device descriptor
• A single configuration descriptor
• A single interface descriptor (including descriptors for alternate settings, if present)
4.3.1
DFU Device Descriptor
This descriptor is only present in the DFU mode descriptor set. The DFU class code is reported
in the bDeviceClass field of this descriptor.
Offset
0
1
2
4
5
6
7
8
10
12
14
Table 4-2.
Field
bLength
bDescriptorType
bcdUSB
bDeviceClass
bDeviceSubClass
bDeviceProtocol
bMaxPacketSize0
idVendor
idProduct
bcdDevice
iManufacturer
DFU Mode Device Descriptor
Size
1
1
2
Value
12h
01h
0100h
Description
Size of this descriptor, in bytes
DFU functional descriptor type
USB specification release number in binary coded decimal
1
FEh
Application Specific Class Code
1
01h
Device Firmware Upgrade Code
1
00h
The device does not use a class specific protocol on this interface
1
32
Maximum packet size for endpoint zero (limited to 32 due to Host side
driver)
2
03EBh Vendor ID
2
2FFBh Product ID
2
0x0000 Device release number in binary coded decimal
1
0
Index of string descriptor
4
7618C–AVR–07/08
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