AK5373 Datasheet, PDF (46/53 Pages) Asahi Kasei Microsystems – 24-bit Stereo ADC with USB Interface

[AK5373]
2. Get Feature Unit Control Request
2-1. Mute Control
Offset
0
1
2
4
Field
bmRequestType
bRequest
wValue
wIndex
6 wLength
Size Value
1 0xA1
1 0x81
2 0x0100
2 0x0300
2 0x0001
Description
GET_CUR
MUTE_CONTROL | CHANNEL_0
Upper byte: bUnitID field in Feature Unit Control Descriptor
(0x03)
Lower byte: Audio Control Interface (0x00)
Length of parameter block
The parameter block of mute control is the following.
Offset
Field
Size Value
0 bMute
1 0x01
0x00
Mute
Not mute
Description
2-2. Volume Control
Offset
Field
0 bmRequestType
1 bRequest
2 wValue
4 wIndex
6 wLength
Size Value
1 0xA1
1 0x81
0x82
0x83
0x84
2 0x0200
0x0201
0x0202
2 0x0300
2 0x0002
Description
GET_CUR
GET_MIN
GET_MAX
GET_RES
VOLUME_CONTROL | CHANNEL_0 (Master)
VOLUME_CONTROL | CHANNEL_1
VOLUME_CONTROL | CHANNEL_2
Upper byte: bUnit ID field in Feature Unit Control Descriptor
(0x03)
Lower byte: Audio Control Interface (0x00)
Length of Parameter Block
The parameter block of volume control is the following.
Offset
Field
Size Value
0 wVolume
2 0xZZYY
0x0100
Description
bRequest=GET_CUR, GET_MIN, GET_MAX: ZZ is
mapped to the volume register value (Table 10). YY must be
00H.
bRequest=GET_RES: 1.0dB
MS1202-E-00
- 46 -
2010/06