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Request AudioReQuest N.Series Manual (62 pages)

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English

Table of contents

USB Audio Design Guide

1

SYNOPSIS

2

Table of Contents

3

1 Overview

5

2 Hardware Platforms

6

3 Software Architecture

9

3.2 Binary Naming

10

3.4 USB Audio Class Support

12

3.5 USB Interface

13

3.5.2 Startup/Enumeration

14

3.5.3 Reset

14

3.6.1 Endpoint Buﬀer

15

3.6.2 Decoupler

15

3.6.3 Audio Buﬀering Scheme

16

NUM_USB_CHAN_OUT

17

NUM_USB_CHAN_IN

17

3.8 Audio Driver

19

Figure 12:

20

Ports and

20

(CODEC slave)

20

3.9 Digital Mixer

21

3.9.1 Control

22

3.9.2 Host Control

22

3.10 S/PDIF Transmit

24

3.10.1 Clocking

25

3.10.2 Usage

25

3.11 S/PDIF Receive

26

3.11.1 Integration

27

3.12 ADAT Receive

28

3.13 Clock Recovery

29

3.14 MIDI

29

3.17 Resource Usage

31

· S/PDIF Transmitter or MIDI

32

3.18.1 Port 32A

33

3.18.2 Clocking

33

Codec

34

3.18.3 HID

35

- D SPDIF =0

36

- D MIDI =1

36

- DAUDIO_CLASS =1

36

3.19.2 CODEC Conﬁguration

37

3.19.3 U-Series ADC

37

3.19.4 HID Example

38

SPDIF as zero:

39

MIDI as 1:

39

-DNUM_USB_CHAN_IN=0

39

Software

40

//# d efine CODEC_SLAVE 1

41

4 Programming Guide

43

4.2 Code Structure

44

4.3.1 Custom Deﬁnes

45

4.3.2 Conﬁguration Functions

47

4.3.3 The main program

49

4.4 Adding Custom Code

51

5.1 Custom Deﬁnes

53

5.3 Component API

55

USB Audio Design Guide 62/61

62

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