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Configuration
Offset
0
Field
aSignature
Size (bytes)
16
Description
Constant used to verify preamble validity. Always
set to “PhdcQoSSignature” string.
16
bNumTransfers
1
Count of following transfers to which QoS setting
applies.
17
bQoSEncodingVersion
1
QoS information encoding version. Should be 0x01.
18
19
20
bmLatencyReliability
bOpaqueDataSize
bOpaqueData
1
1
[0 ..
Bitmap that refers to latency / reliability bin for data.
Length, in bytes, of opaque data.
Optional data usually application specific that is
11
MaxPacketSize - 21]
opaque to the class.
Table 11-3 Metadata Preamble
11-2 CONFIGURATION
11-2-1 GENERAL CONFIGURATION
Some constants are available to customize the class. These constants are located in the
usbd_cfg.h file. Table 11-4 shows a description of each of them.
Constant
USBD_PHDC_CFG_MAX_NBR_DEV
USBD_PHDC_CFG_MAX_NBR_CFG
USBD_PHDC_CFG_DATA_OPAQUE_MAX_LEN
Description
Configures the maximum number of class instances. Unless you plan
having multiple configuration or interfaces using different class
instances, this can be set to 1.
Configures the maximum number of configuration in which PHDC is
used. Keep in mind that if you use a high-speed device, two
configurations will be built, one for full-speed and another for
high-speed.
Maximum length in octets that opaque data can be. Must always be
equal or less to MaxPacketSize - 21.
187
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