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---
title: XMOS XU316 HiFi USB Decoder ZeroCode Firmware Configuration Protocol
---
# XMOS XU316 HiFi USB Decoder ZeroCode Firmware Configuration Protocol
## I. 💡 ZeroCode Firmware Functional Scope
* The firmware focuses exclusively on audio-related functions and does not handle buttons, indicators, or other functions unrelated to core functionality.
* Other user interaction features are managed by the MCU.
* MCU and XU316 communicate bidirectionally via UART for command and data exchange.
* The firmware communicates with the computer via HID.
## II. XU316 and MCU Configuration Protocol
### 1. Low-Level Protocol
Based on UART (Universal Asynchronous Receiver/Transmitter) protocol
#### Terminology
| Term | Description |
|---------------|--------------------|
| Baud Rate | 115200 bps |
| Data Bits | 8 |
| Parity | None |
| Stop Bits | 1 |
| Flow Control | None |
### 2. Frame Format
| Field | Bytes | Description |
|----------|--------|-----------------------------------------|
| Header | 2 | Fixed as 0x55aa |
| Version | 1 | Protocol version number |
| Command | 1 | Indicates the frame's function |
| Data Length | 2 | Length of subsequent data N |
| Data | N | Specific data content |
| Checksum | 1 | Sum of all bytes from header, modulo 256 |
> **Notes**
> All multi-byte data is transmitted in big-endian format. Examples in the protocol are in hexadecimal.
### 3. XU316 Startup Sequence and MCU Interaction Process
#### 3.1 Power-on Startup and Startup Options Phase (Only runs during manual power-on startup)
**Steps**:
1. XU316 startup sends a start command (command 0x00) to the MCU, including UAC1.0 VID/PID, UAC2.0 VID/PID, basic information CRC, and power-on configuration CRC.
2. MCU receives the startup command, checks whether basic information and power-on configuration need to be updated, and sends the corresponding response to XU316. XU316 waits for MCU to respond to startup for up to 3 seconds.
3. If no response is received within 300ms, XU316 resends the startup command up to 4 times. If no response is received after 4 attempts, it loads the default USB configuration and enumerates USB.
4. MCU responds to the startup command to XU316, including startup options.
5. XU316 parses the startup options.
#### 3.2 Basic Information Update Phase (Only runs during manual power-on startup)
Condition: Startup options include 0x01 (Update basic product information)
1. XU316 requests to read basic product information, sends command 0x01
2. MCU returns new basic product information to XU316.
3. XU316 updates and saves the configuration.
#### 3.3 Power-on Configuration Acquisition Phase (Only runs during manual power-on startup)
Condition: Startup options include 0x02 (Update power-on configuration) or data read from Flash is incomplete.
1. XU316 requests to get power-on configuration. Sends command 0x02
2. MCU returns new power-on configuration to XU316.
3. XU316 updates and saves the configuration.
#### 3.4 Loading Application Firmware Phase
Steps:
1. XU316 gets the current mode, sends command 0x03.
2. MCU returns the current mode to XU316.
3. XU316 loads the corresponding mode based on the current mode.
#### APP Running Phase
Steps:
1. XU316 gets the current user configuration (volume, etc.), command 0x04.
2. MCU returns the current user configuration to XU316.
3. XU316 initializes the APP and applies the current user configuration.
4. XU316 sends a startup completion command to MCU, command 0x05.
5. MCU returns a completion command response to XU316.
### 4. Command List
| Command | Description |
|--------|---------------------------------------------|
| 0x00 | Start Startup |
| 0x01 | Read Product Information |
| 0x02 | Read Power-on Configuration Information |
| 0x03 | Get Current Audio Mode |
| 0x04 | Get Current User Configuration |
| 0x05 | Startup Completion Command |
| 0x20 | Report Application Status |
| 0x21 | Media Control |
| 0x22 | Set Playback Audio Stream Format and Type |
| 0x23 | Set Audio Mode |
| 0x24 | Send Playback Volume |
| 0x25 | Send Recording Volume |
| 0x01 | HID Start MCU OTA Upgrade Command |
| 0x02 | HID Send MCU Upgrade Data Packet |
| 0x03 | HID Send MCU Upgrade End Packet |
> **Notes:**
>
> 1. All commands must follow the basic frame format
> 2. Some commands require confirmation response from the other party
> 3. Certain commands can only be used under specific conditions (such as OTA-related commands)
> 4. Command response timeout is typically 5 seconds
> 5. Application commands should be sent only after XU316 startup commands are completed
### 5. Protocol Mechanism
#### 5.1 Confirmation Mechanism
- All commands require a confirmation reply from the other party
- Default command timeout is 5 seconds, after which it's considered failed, unless otherwise specified
### 6. Business Protocol
#### 6.1 Basic Function Commands
##### 6.1.1 Start Startup (Command: 0x00)
###### XU316 Sends:
| Field | Bytes | Description |
|----------|-----|-------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x00 |
| **Command** | 1 | 0x00 |
| **Data Length** | 1 | 17 |
| **Data** | 17 | B0 Restart Reason: 0x00 Power-on restart, 0x01 Mode switch restart, 0xFF Other reason restart |
| | | B1-2 unsigned short VID (UAC1.0) |
| | | B3-4 unsigned short PID (UAC1.0) |
| | | B5-6 unsigned short VID (UAC2.0) |
| | | B7-8 unsigned short PID (UAC2.0) |
| | | B9-12 unsigned int Basic information 32bit CRC |
| | | B13-16 unsigned int Power-on configuration 32bit CRC |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
###### MCU Response Field Description
| Field | Bytes | Description |
|----------|-----|--------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x03 |
| **Command** | 1 | 0x00 |
| **Data Length** | 1 | 0x1 |
| **Data** | 1 | B0 Startup options, see Data Field Description section; 0x00 Use all default information; 0x01 Update basic product information is required; 0x02 Update power-on configuration information is required; 0x04 Update other configuration information is required. |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
##### 6.1.2 Read Product Information (Command: 0x01)
##### XU316 Sends
| Field | Bytes | Description |
|-------------|--------|-----------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x00 |
| **Command** | 1 | 0x01 |
| **Data Length**| 1 | 0x00 |
| **Data** | 0 | |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
##### MCU Response
| Field | Bytes | Description |
|-------------|--------|-----------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x03 |
| **Command** | 1 | 0x01 |
| **Data Length**| 1 | 0x3C (60 bytes) |
| **Data** | 60 | Basic product information, see Business Information section |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### 6.1.3 Read Power-on Configuration Information (Command: 0x02)
##### XU316 Sends
| Field | Bytes | Description |
|-------------|--------|-----------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x00 |
| **Command** | 1 | 0x02 |
| **Data Length**| 1 | 0x00 |
| **Data** | 0 | No data, indicating no additional information transmission |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
##### MCU Response
| Field | Bytes | Description |
|-------------|--------|-----------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x03 |
| **Command** | 1 | 0x02 |
| **Data Length**| 1 | 0x0E (14 bytes) |
| **Data** | 14 | Power-on configuration information, see Business Information section |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### 6.1.4 Get Current Audio Mode (Command: 0x03)
##### XU316 Sends
| Field | Bytes | Description |
|-------------|--------|-----------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x00 |
| **Command** | 1 | 0x03 |
| **Data Length**| 1 | 0x00 |
| **Data** | 0 | No data, indicating no additional information transmission |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
##### MCU Response
| Field | Bytes | Description |
|-------------|--------|-----------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x03 |
| **Command** | 1 | 0x03 |
| **Data Length**| 1 | 0x05 (5 bytes) |
| **Data** | 5 | Audio mode, see Data Field section |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
##### 6.1.5 Get Current User Configuration (Command: 0x04)
###### XU316 Sends
| Field | Bytes | Description |
|-------------|--------|-----------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x00 |
| **Command** | 1 | 0x04 |
| **Data Length**| 1 | 0x00 |
| **Data** | 0 | No data, indicating no additional information transmission |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
###### MCU Response
| Field | Bytes | Description |
|-------------|--------|-----------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x03 |
| **Command** | 1 | 0x04 |
| **Data Length**| 1 | 0x14 (20 bytes) |
| **Data** | 14 | User configuration parameters, see Business Information section |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### 6.1.6 Startup Completion Command (Command: 0x05)
##### XU316 Sends
| Field | Bytes | Description |
|-------------|--------|-----------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x00 |
| **Command** | 1 | 0x05 |
| **Data Length**| 1 | 0x15 (21 bytes) |
| **Data** | 15 | Startup status and application running parameters |
| | | B0: 0 Startup successful, 1 Mode mismatch, other values Startup failed |
| | | B1-BN: Application running parameters, see Business Information Description |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
##### MCU Response
| Field | Bytes | Description |
|-------------|--------|-----------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x03 |
| **Command** | 1 | 0x05 |
| **Data Length**| 1 | 0x00 |
| **Data** | 0 | No data |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### 6.2 Business Control and Query Commands (Can only be sent after startup is complete)
#### 6.2.1 Report Application Status (Command: 0x20)
#### XU316 Sends
| Field | Bytes | Description |
|-------------|--------|-----------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x00 |
| **Command** | 1 | 0x20 |
| **Data Length**| 1 | 0x14 (20 bytes) |
| **Data** | 14 | Application running parameters, see **Business Information Description** |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### MCU Response
| Field | Bytes | Description |
|-------------|--------|-----------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x03 |
| **Command** | 1 | 0x20 |
| **Data Length**| 1 | 0x00 |
| **Data** | 0 | No data |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### 6.2.2 Media Control (Command: 0x21)
#### MCU Sends
| Field | Bytes | Description |
|-------------|--------|---------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x03 |
| **Command** | 1 | 0x21 |
| **Data Length**| 1 | 0x01 (1 byte) |
| **Data** | 1 | Media control command, see media control field |
| | | 0x00 Volume+ / **Vol Up** |
| | | 0x01 Volume- / **Vol Down** |
| | | 0x02 Play / **PLAY** |
| | | 0x03 Next / **NEXT** |
| | | 0x04 Previous / **PREV** |
| | | 0x05 Fast Forward / **FORWARD** |
| | | 0x06 Rewind / **REWIND** |
| | | 0x07 Mute / **MUTE** |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### XU316 Response
| Field | Bytes | Description |
|-------------|--------|-------------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x01 |
| **Command** | 1 | 0x21 |
| **Data Length**| 1 | 0x00 |
| **Data** | 0 | No data |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### 6.2.3 Set Playback Audio Stream Format and Type (Command: 0x22)
#### XU316 Sends
| Field | Bytes | Description |
|-------------|--------|-------------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x03 |
| **Command** | 1 | 0x22 |
| **Data Length**| 1 | 0x02 (2 bytes) |
| **Data** | 2 | Audio stream format and type, see **Audio Stream Format and Type Field** |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### MCU Response
| Field | Bytes | Description |
|-------------|--------|-------------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x01 |
| **Command** | 1 | 0x22 |
| **Data Length**| 1 | 0x00 |
| **Data** | 0 | No data |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### 6.2.4 Set Audio Mode (Command: 0x23)
#### MCU Sends
| Field | Bytes | Description |
|-------------|--------|-------------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x03 |
| **Command** | 1 | 0x23 |
| **Data Length**| 1 | 0x05 (5 bytes) |
| **Data** | 5 | Audio mode, see **Audio Mode Field** |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### XU316 Response
| Field | Bytes | Description |
|-------------|--------|-------------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x01 |
| **Command** | 1 | 0x23 |
| **Data Length**| 1 | 0x00 |
| **Data** | 0 | No data |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### 6.2.5 Send Playback Volume (Command: 0x24)
#### XU316 Sends
| Field | Bytes | Description |
|------------|-----|-------------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x03 |
| **Command** | 1 | 0x24 |
| **Data Length**| 1 | 0x02 (2 bytes) |
| **Data** | 2 | Left channel: 0xFF Mute, 0-0dB -127: -127dB |
| | | Right channel: 0xFF Mute, 0-0dB -127: -127dB |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### MCU Response
| Field | Bytes | Description |
|-------------|--------|-------------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x01 |
| **Command** | 1 | 0x24 |
| **Data Length**| 1 | 0x00 |
| **Data** | 0 | No data |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### 6.2.6 Send Recording Volume (Command: 0x25)
#### XU316 Sends
| Field | Bytes | Description |
|-------------|--------|----------------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x03 |
| **Command** | 1 | 0x25 |
| **Data Length**| 1 | 0x01 (1 byte) |
| **Data** | 1 | 0xFF Mute, 0-0dB -127: -127dB |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### MCU Response
| Field | Bytes | Description |
|-------------|--------|----------------------------------------------------|
| **Header** | 2 | 0x55aa |
| **Version** | 1 | 0x01 |
| **Command** | 1 | 0x25 |
| **Data Length**| 1 | 0x00 |
| **Data** | 0 | No data |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### 6.2.7 Switch MCLK (Command Word: 0x26)
#### XU316 sends:
| Field | Bytes | Description |
| ------------ | ---------- | --------------------------------------------------------- |
| Frame Header | 2 | 0x55aa |
| Version | 1 | 0x03 |
| Command Word | 1 | 0x26 |
| Data Length | 1 | 1 |
| Data | 1 | 0: Internal MCLK 1: External MCLK |
| Checksum | 1 | Sum from the frame header byte by byte, result modulo 256 |
#### MCU returns:
| Field | Bytes | Description |
| ------------ | ---------- | --------------------------------------------------------- |
| Frame Header | 2 | 0x55aa |
| Version | 1 | 0x01 |
| Command Word | 1 | 0x26 |
| Data Length | 1 | 0 |
| Data | 0 | None |
| Checksum | 1 | Sum from the frame header byte by byte, result modulo 256 |
#### 6.2.8 Test Command (Command Word: 0xF0)
#### XU316 sends:
| Field | Bytes | Description |
| ------------ | ---------- | ------------------------------------------------------------ |
| Frame Header | 2 | 0x55aa |
| Version | 1 | 0x03 |
| Command Word | 1 | 0xF0 |
| Data Length | 1 | 4 |
| Data | 4 | Byte 0: 0: Enable I2C config DAC 1: Disable I2C config DAC Byte 1 - 2: reserved |
| Checksum | 1 | Sum from the frame header byte by byte, result modulo 256 |
#### MCU returns:
| Field | Bytes | Description |
| ------------ | ---------- | --------------------------------------------------------- |
| Frame Header | 2 | 0x55aa |
| Version | 1 | 0x01 |
| Command Word | 1 | 0x26 |
| Data Length | 1 | 0 |
| Data | 0 | None |
| Checksum | 1 | Sum from the frame header byte by byte, result modulo 256 |
#### 6.3 MCU OTA Upgrade Commands (Pass-through Mode)
#### 6.3.1 HID Start MCU OTA Upgrade Command
#### XU316 Sends: (HID Report ID1 Output Report 40 bytes)
| Field | Bytes | Description |
|-------------|--------|---------------------|
| **Header** | 2 | 0xaa55 |
| **Control Byte** | 1 | 0x01 |
| **Extended Bytes**| 3 | FileSize |
| **FileSize**| 1 | Length of data in the data field |
| **Data** | 32 | Default 0 (this field is for possible extension data) |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### MCU Response
| Field | Bytes | Description |
|-------------|--------|-----------------------------------------------------------|
| **Header** | 2 | 0xaa55 |
| **Control Byte** | 1 | 0x01 |
| **Data** | 4 | |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### 6.3.2 HID Send MCU Upgrade Data Packet
#### XU316 Sends
| Field | Bytes | Description |
|-------------|--------|-------------------------------------|
| **Header** | 2 | 0xaa55 |
| **Control Byte** | 1 | 0x02 |
| **Extended Bytes**| 3 | **address**: Indicates the address of the upgrade data (typically used to specify upgrade location or block) |
| **Data Length**| 1 | Length of data in the data field |
| **Data** | 32 | data |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### MCU Response
| Field | Bytes | Description |
|-------------|--------|------------------------------------------------------------|
| **Header** | 2 | 0xaa55 |
| **Control Byte** | 1 | 0x02 |
| **Data** | 4 | |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### 6.3.3 HID Send MCU Upgrade End Packet
#### XU316 Sends
| Field | Bytes | Description |
|-------------|--------|------------------------------------------------------------|
| **Header** | 2 | 0xaa55 |
| **Control Byte** | 1 | 0x03 |
| **Extended Bytes**| 3 | Reserved (default 0) |
| **Data Length**| 1 | Length of data in the data field |
| **Data** | 32 | Reserved (default 0) |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
#### MCU Response
| Field | Bytes | Description |
|-------------|--------|------------------------------------------------------------|
| **Header** | 2 | 0xaa55 |
| **Control Byte** | 1 | 0x03 |
| **Data** | 4 | |
| **Checksum** | 1 | Sum of all bytes from header, modulo 256 |
### 7. Business Information
#### 7.1 Basic Product Information
| Field | Bytes | Description |
|--------------------|--------|---------------------------------------------------------|
| **VID1** | 2 | USB Vendor ID (UAC1.0) |
| **PID1** | 2 | USB Product ID (UAC1.0) |
| **VID2** | 2 | USB Vendor ID (UAC2.0) |
| **PID2** | 2 | USB Product ID (UAC2.0) |
| **ManufactureName** | 16 | USB Manufacture Name (string, max 16 bytes) |
| **ProductName** | 16 | USB Product Name (string, max 16 bytes) |
| **SerialNumber** | 16 | Product Serial Number (string, max 16 bytes) |
| **CRC** | 4 | 32-bit CRC checksum calculated for all fields (VID1, PID1, VID2, PID2, ManufactureName, ProductName, SerialNumber) |
The MCU can determine whether to update the basic product information based on the CRC returned by the XU316.
#### 7.2 Power-on Configuration Information
| Field | Bytes | Description |
|-------------------------|--------|-----------------------------------------------|
| **Default Audio Mode** | 5 | See Audio Mode Field Description |
| **Mute Time** | 2 | 0-65535 (ms) |
| **Microphone Default Volume** | 1 | See Microphone Volume Field Description |
| **DAC Left Channel Default Volume** | 1 | See DAC Volume Field Description |
| **DAC Right Channel Default Volume** | 1 | See DAC Volume Field Description |
| **CRC** | 4 | 32-bit CRC checksum calculated for all fields (Default Audio Mode, Mute Time, Microphone Volume, DAC Left/Right Channel Volume) |
The MCU can determine whether to update the power-on configuration information based on the CRC returned by the XU316.
#### 7.3 Application Running Parameters
| Field | Bytes | Description |
|-------------------------|--------|-----------------------------------------------|
| **Audio Mode** | 5 | See Audio Mode Field Description |
| **Mute Time** | 2 | 0-65535 (ms) |
| **Microphone Volume** | 1 | See Microphone Volume Field Description |
| **DAC Left Channel Volume** | 1 | See DAC Volume Field Description |
| **DAC Right Channel Volume** | 1 | See DAC Volume Field Description |
| **CRC** | 4 | 32-bit CRC checksum calculated for all fields (Audio Mode, Mute Time, Microphone Volume, DAC Left/Right Channel Volume) |
#### 7.4 User Configuration Parameters
| Field | Bytes | Description |
|-------------------------|--------|-----------------------------------------------|
| **Audio Mode** | 5 | See Audio Mode Field Description |
| **Mute Time** | 2 | 0-65535 (ms) |
| **Microphone Volume** | 1 | See Microphone Volume Field Description |
| **DAC Left Channel Volume** | 1 | See DAC Volume Field Description |
| **DAC Right Channel Volume** | 1 | See DAC Volume Field Description |
| **CRC** | 4 | 32-bit CRC checksum calculated for all fields (Audio Mode, Mute Time, Microphone Volume, DAC Left/Right Channel Volume) |
### 8. Data Field Description
#### 8.1 Restart Reason
| Length | Description |
|-------|-------------------------------|
| 1 byte | 0x00 Power-on restart |
| | 0x01 Mode switch restart |
| | 0xFF Other reason restart |
#### 8.2 Startup Options
| Length | Description |
|-------|-------------------------------|
| 1 byte | 0x00 Use all default information |
| | 0x01 Need to update basic product information |
| | 0x02 Need to update power-on configuration information |
| | 0x04 Need to update IO configuration information |
#### 8.3 Audio Mode
| Length | Function Bit | Description |
|----------|------|----------------------------------------------------|
| 6 bytes | | |
| BYTE 0 | Bit 7 | I2S Mode: 0: Master, 1: Slave |
| | Bit 6 | Sync Mode: 0: Async, 1: Sync |
| | Bit 5 | MIDI: 0: disable, 1: enable |
| | Bit 4 | SPDIF in: 0: disable, 1: enable |
| | Bit 3 | SPDIF out: 0: disable, 1: enable |
| | Bit 2 | ADAT in: 0: disable, 1: enable |
| | Bit 1 | ADAT out: 0: disable, 1: enable |
| | Bit 0 | DSD out: 0: disable, 1: enable |
| BYTE 1 | Bit 0-3 | AUDIO Sample Rate: |
| | | 0: 44.1KHz, 1: 48KHz, 2: 88.2KHz, 3: 96KHz, |
| | | 4: 176.4KHz, 5: 192KHz, 6: 352.8KHz, 7: 384KHz, |
| | | 8: 705.6KHz, 9: 768KHz, 10: 1411.2KHz, 11: 1536KHz |
| | Bit 4 | MQA: 0: disable, 1: enable |
| | Bit 5 | Audio Class: 0: UAC 1.0, 1: USB UAC 2.0 |
| | Bit 6-7 | AUDIO WIDTH: 0: 16bit, 1: 24bit, 2: 32bit |
| BYTE 2-3 | Bit 0-5 | Input: 0: disable, x(>0): channel count |
| | Bit 6-11 | Output: 0: disable, x(>0): channel count |
| | Bit 12-15 | Other cfg |
| BYTE 4 | | 0: USB MODE, 1: OPT MODE, 2: COAX MODE, 3: BT MODE, |
| | | 4: HDMI ARC MODE, 5: WIFI MODE, 6: AIRPLAY MODE, 7: SPOTIFY MODE |
#### 8.4 Microphone Volume
| Length | Description |
|-------|--------------------------------------------|
| 1 byte | 0xFF Mute |
| | 0x00-0xFE Defined by MCU and HID application |
#### 8.5 DAC Volume
| Length | Description |
|-------|--------------------------------------------|
| 1 byte | 0x00 Mute |
| | 0x01-0xFF Defined by MCU and HID application |
#### 8.6 Power-on Mode
| Length | Description |
|-------|------------------------------------------------------------|
| 1 byte | 0x00 Default mode, uses power-on configuration parameters at startup |
| | 0x01 Power-off memory mode, uses user configuration parameters from MCU at startup |
#### 8.7 Media Control (Media Buttons)
| Length | Description |
|-------|--------------------------------------|
| 1 byte | 0x00 Volume+/Vol Up |
| | 0x01 Volume-/Vol Down |
| | 0x02 Play/PLAY |
| | 0x03 Next/NEXT |
| | 0x04 Previous/PREV |
| | 0x05 Fast Forward/FORWARD |
| | 0x06 Rewind/REWIND |
| | 0x07 Mute/MUTE |
#### 8.8 Audio Stream Format and Type
#### Audio Stream Format
| Length | Description |
|-------|--------------------------------------|
| 1 byte | 0x00 AUDIO_PCM_44100 |
| | 0x01 AUDIO_PCM_48000 |
| | 0x02 AUDIO_PCM_88200 |
| | 0x03 AUDIO_PCM_96000 |
| | 0x04 AUDIO_PCM_176400 |
| | 0x05 AUDIO_PCM_192000 |
| | 0x06 AUDIO_PCM_352800 |
| | 0x07 AUDIO_PCM_384000 |
| | 0x08 AUDIO_PCM_705600 |
| | 0x09 AUDIO_PCM_768000 |
| | 0x0A AUDIO_PCM_1441200 |
| | 0x0B AUDIO_PCM_1536000 |
| | 0x0C AUDIO_PCM_32000 |
| | 0x0D AUDIO_PCM_64000 |
| | 0x0E AUDIO_PCM_128000 |
| | 0x0F AUDIO_PCM_256000 |
| | 0x10 AUDIO_PCM_512000 |
| | 0x11 AUDIO_DSD_64 |
| | 0x12 AUDIO_DSD_128 |
| | 0x13 AUDIO_DSD_256 |
| | 0x14 AUDIO_DSD_512 |
| | 0x15 AUDIO_DSD_1024 |
| | 0x16 AUDIO_MQA_44100 |
| | 0x17 AUDIO_MQA_88200 |
| | 0x18 AUDIO_MQA_176400 |
| | 0x19 AUDIO_MQA_352800 |
| | 0x1A AUDIO_MQA_705600 |
| | 0x1B AUDIO_MQA_1411200 |
| | 0x1C AUDIO_MQA_2822400 |
| | 0x1D AUDIO_MQA_5644800 |
| | 0x1E AUDIO_MQA_48000 |
| | 0x1F AUDIO_MQA_96000 |
| | 0x20 AUDIO_MQA_192000 |
| | 0x21 AUDIO_MQA_384000 |
| | 0x22 AUDIO_MQA_768000 |
| | 0x23 AUDIO_MQA_1536000 |
| | 0x24 AUDIO_MQA_3072000 |
| | 0x25 AUDIO_MQA_6144000 |
| | 0x26 AUDIO_MQA_64000 |
| | 0x27 AUDIO_MQA_128000 |
| | 0x28 AUDIO_MQA_256000 |
| | 0x29 AUDIO_MQA_512000 |
| | 0x2A AUDIO_MQA_1024000 |
| | 0x2B AUDIO_MQA_2048000 |
| | 0x2C AUDIO_MQA_4096000 |
| | 0x2D AUDIO_MQA_8192000 |
| | 0xFF AUDIO_NO_USED |
#### Audio Type
| Length | Description |
|-------|--------------------------------------|
| 1 byte | 0x00 PCM |
| | 0x01 Reserve |
| | 0x02 MQA |
| | 0x03 MQB |
| | 0x04 MQA_Studio |
| | 0x05 DSD |
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