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USB Audio Design Guide 54/61

Deﬁne Description Default

MIXER Deﬁne to enable the MIXER. not deﬁned

MIN_VOLUME

The minimum volume setting above -inf.

This is a signed 8.8 ﬁxed point number that

must be strictly greater than -128 (0x8000).

0x8100

MAX_VOLUME

The maximum volume setting for the mixer

in db. This is a signed 8.8 ﬁxed point num-

ber.

VOLUME_RES

The resolution of the volume control in db

as a 8.8 ﬁxed point number.

0x100

MIN_MIXER_VOLUME

The minimum volume setting for the mixer

unit above -inf. This is a signed 8.8 ﬁxed

point number that must be strictly greater

than -128 (0x8000).

0x8080

MAX_MIXER_VOLUME

The maximum volume setting for the mixer.

This is a signed 8.8 ﬁxed point number.

0x0600

VOLUME_RES_MIXER

The resolution of the volume control in db

as a 8.8 ﬁxed point number.

0x080

5.1.2 USB Device Conﬁguration Options

Deﬁne Description Default

VENDOR_ID Vendor ID (0x20B1)

PID_AUDIO_2 Product ID (Audio Class 2) N/A

PID_AUDIO_1 Product ID (Audio Class 1) N/A

BCD_DEVICE Device release number in BCD form N/A

VENDOR_STR String identifying vendor XMOS

SERIAL_STR String identifying serial number “0000”

5.2 Required User Function Deﬁnitions

The following functions need to be deﬁned by an application using the USB audio framework.

5.2.1 Codec Conﬁguration Functions

void CodecInit(chanend ?c_codec)

This function is called when the audio core starts after the device boots up and

should initialize the CODEC.

This function has the following parameters:

c_codec

An optional chanend that was original passed into audio() that can

be used to communicate with other cores.

REV 6.1

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