AK4571 Datasheet, PDF (49/54 Pages) Asahi Kasei Microsystems – USB I/F Audio CODEC

ASAHI KASEI
[AK4571]
5.7.
HID
5.7.1. Get Descriptor(HID/Report)
Offset Field
Size Value
0
BmRequestType
1 0x81
1
BRequest
1 0x06
2
wValue
2 0x2100
0x2200
4
wIndex
2 0x0003
6
wLength
2 0xZZZZ
Description
GET_DESCRIPTOR
HID Descriptor
Report Descriptor
Interface Number (#3)
Descriptor Length (ZZZZ is assigned by host)
wValue HID Descriptor
wValue Report Descriptor
HID Descriptor
Report Descriptor 31
Report Descriptor
Usage Page (Consumer)
Usage (Consumer Control)
Collection (Application)
Logical Minimum (0)
Logical Maximum (1)
Usage (Volume Increment)
Usage (Volume Decrement)
Report Size (1)
Report Count (2)
Input (Data, Variable, Absolute, No_Wrap, No_Preferred)
Usage (Mute)
Report Count (1)
Input (Data, Variable, Relative, No_Wrap, No_Preferred)
Report Count (5)
Input (Constant)
End Collection
0x05, 0x0c
0x09, 0x01
0xA1, 0x01
0x15, 0x00
0x25, 0x01
0x09, 0xE9
0x09, 0xEA
0x75, 0x01
0x95, 0x02
0x81, 0x2A
0x09, 0xE2
0x95, 0x01
0x81, 0x2E
0x95, 0x05
0x81, 0x01
0xC0
Data Length 1 bit
Number of Data INC, DEC: two
MS0153-J-02
- 49 -
2003/3