參數(shù)資料
型號: AK5370VF
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: JT 6C 6#12 SKT GRND PLUG
中文描述: 我的USB /英格蘭/ D轉(zhuǎn)換器
文件頁數(shù): 21/27頁
文件大?。?/td> 203K
代理商: AK5370VF
ASAHI KASEI
[AK5370]
MS0027-E-00
21
2000/05
6.1.2 Get Feature Unit Control Request
AKM USB Microphone supports only one form of parameter block.
a) Mute Control
Offset
Field
Size
0
bmRequestType
1
1
bRequest
1
2
wValue
2
4
wIndex
2
Value
0xA1
0x81
0x0100
0x0300
Description
GET_CUR
MUTE_CONTROL | CHANNEL_0
Upper Byte : bUnit ID field in Feature Unit
Descriptor.(0x03)
Lower Byte : Audio Control Interface(0x00)
The Length of Mute Control Parameter Block
6
The device outputs the current setting of mute status.
Offset
Field
0
bMute
wLength
2
0x0001
Size
1
Value
0x01
0x00
Description
TRUE
FALSE
b) Volume Control
Offset
0
1
Field
bmRequestType
bRequest
Size
1
1
Value
0xA1
0x81
0x82
0x83
0x84
0x0200
0x0300
Description
GET_CUR
GET_MIN
GET_MAX
GET_RES
VOLUME_CONTROL | CHANNEL_0
Upper Byte : bUnit ID field in Feature Unit
Descriptor.(0x03)
Lower Byte : Audio Control Interface(0x00)
Volume Control
2
4
wValue
wIndex
2
2
6
The parameter block of Volume Control is the following.
Offset
Field
0
wVolume
wLength
2
0x0002
Size
2
Value
0xZZYY
0xC600
0x1400
0x0100
Description
bRequest = GET_CUR : returns current volume.
YY must be 00h
bRequest = GET_MIN : -58dB
bRequest = GET_MAX : +20dB
bRequest = GET_RES : 1.0dB
Table 1 is the conversion map of USB class and internal volume register.
When host requests the volume value which is larger than the MAX value in the device, the device
sets the MAX value to the volume. When host requests the volume value which is smaller than
the MIN value in the device, the device sets the MIN value to the volume. RES value is 1.0dB.
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