Programmers Guide
TH230/TH230+
236
Configuration Descriptor
The configuration descriptor describes information about a specific device configuration.
The descriptor contains a
bConfigurationValue
field with a value that, when used as a
parameter to the SetConfiguration() request, causes the device to assume the described
configuration.
A USB device has one or more configuration descriptors. Each configuration has one or
more interfaces and each interface has zero or more endpoints.
The whole configuration is transmitted in the following order:
-
Configuration Descriptor
-
Interface 0 Descriptor (Printer)
-
Endpoint 1-2 Descriptors
-
Interface 1 Descriptor (DFUX)
-
DFUX Functional Descriptor
Offset Field
Size Value
Description
0
bLength
1
09h
Size of this descriptor, in bytes
1
bDescriptorType
1
02h
CONFIGURATION descriptor type
2
wTotalLength
2
XXh
Size of complete configuration descriptors
(configuration, interface, endpoint, class- or
vendor-specific) in bytes
4
bNumInterfaces
1
02h
Number of interfaces supported by this config.
5
bConfigurationValue
1
01h
Configuration value (for SET_CONFIGURATION)
6
iConfiguration
1
00h
Index of string descriptor (not used)
7
bmAttributes
1
E0h
Configuration characteristics
Bit 7:
Reserved (set to one)
Bit 6:
Self-powered
Bit 5:
Remote Wakup
Bit 4..0:
Reserved (reset to zero)
8
bMaxPower
1
00h
Maximum power consumption from the bus
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