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USB Audio Design Guide 59/61
c_clk_int Optional chanend connected to the clockGen() thread if present
void mixer(chanend c_to_host, chanend c_to_audio, chanend c_mix_ctl)
Digital sample mixer.
This thread mixes audio streams between the decouple() thread and the audio()
thread.
This function has the following parameters:
c_to_host
a chanend connected to the decouple() thread for receiving/trans-
mitting samples
c_to_audio
a chanend connected to the audio() thread for receiving/transmitting
samples
c_mix_ctl
a chanend connected to the Endpoint0() thread for receiving control
commands
void audio(chanend c_in, chanend ?c_dig, chanend ?c_config, chanend ?c_adc)
The audio driver thread.
This function drives I2S ports and handles samples to/from other digital I/O
threads.
This function has the following parameters:
c_in
Audio sample channel connected to the mixer() thread or the de-
couple() thread
c_dig
channel connected to the clockGen() thread for receiving/transmit-
ting samples
c_config
An optional channel that will be passed on to the CODEC configura-
tion functions.
void clockGen(streaming chanend c_spdif_rx,
chanend c_adat_rx,
out port p,
chanend c_audio,
chanend c_clk_ctl,
chanend c_clk_int)
Clock generation and digital audio I/O handling.
This function has the following parameters:
c_spdif_rx channel connected to S/PDIF receive thread
c_adat_rx channel connect to ADAT receive thread
p port to output clock signal to drive external frequency synthesizer
REV 6.1
- 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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