Product Configuration Commands (UART)¶
Command Set Scope¶
Applicability
This page contains the UART business commands exchanged between XU316 zero-code products and the host MCU (frame format: 0x55AA header, big-endian transmission, see XU316 UART Base Protocol; startup and basic commands 0x00-0x05 belong to the base protocol).
This page is same-source maintained with the "Product Control Commands" chapter of product datasheets. Product firmwares may support different command subsets (e.g. 0xF0 is product-specific); refer to the product datasheet.
Command Overview¶
| Command | Command Description | Direction | Applicability Notes |
|---|---|---|---|
| 0x20 | Report application status | XU316→MCU | Sent on status change or 15s timer |
| 0x21 | Media control | MCU→XU316 | Converted by XU316 to HID command sent to computer |
| 0x22 | Report playback audio stream format and type | XU316→MCU | For displaying PCM/DSD/MQA/DOP status |
| 0x23 | Set input/output mode | MCU→XU316 | Mode values in datasheet section 2.1 table |
| 0x24 | Send playback volume | XU316→MCU | Left/right channel, 1 byte each |
| 0x25 | Send recording volume | XU316→MCU | Reserved command, currently not used |
| 0x26 | Switch MCLK | MCU→XU316 | Internal/external master clock switching |
| 0x27 | Set unmute | MCU→XU316 | DAC unmute delay during mode switching |
| 0x28 | Send audio format time delay | MCU→XU316 | Audio format switching delay configuration |
| 0x29 | Report USB connection status | XU316→MCU | Proactively reported on USB connect/disconnect |
| 0x30 | Set Mute pin inversion | MCU→XU316 | Adapts hardware with inverted Mute polarity |
| 0x31 | Get current audio format | MCU→XU316 | Queries current audio stream format and type |
| 0xF0 | DAC configuration selection | MCU→XU316 | Product-specific, not supported by all products |
| 0xF1 | Get firmware version | MCU→XU316 | Queries XU316 firmware version (3-byte BCD major version) |
| 0xF3 | Query complete version number | MCU→XU316 | Returns complete ASCII version string (model_vMajor.Minor.Rev_bBuild) |
| 0xEE | HID data passthrough | XU316→MCU | HID passes data to MCU via XU316 (e.g. MCU OTA) |
Usage Prerequisites
The above commands can only be used after device startup is complete (after XU316 sends the 0x05 startup complete command and receives the response). All commands must follow the base protocol frame format (frame header 0x55AA, big-endian transmission, checksum = sum of all bytes from frame header modulo 256); each command requires acknowledgment from the recipient, with a default timeout of 300ms and up to 4 retries.
Command Details¶
Report Application Status (0x20)¶
XU316 Sends
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x00
Command: 1 byte - 0x20
Data Length: 1 byte - N
Data: N bytes - Application runtime parameters, see section 4.1-Application Runtime Parameters
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
MCU Returns
- This command is used by XU316 to report current application status to MCU
- Typically sent when status changes, such as volume change, mode switch, etc.
- MCU can update UI display or adjust related functions based on this info
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header indicating start of a protocol frame |
| Version | 1 byte | 03 | Indicates this frame is an acknowledgment returned by MCU to XU316 |
| Command | 1 byte | 20 | Acknowledges “Report Application Status” |
| Data Length | 1 byte | 00 | Pure acknowledgment frame with no data |
| Checksum | 1 byte | 22 | Sum of all bytes from 55 to 00, modulo 256 |
Media Control (0x21)¶
MCU Sends
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x03
Command: 1 byte - 0x21
Data Length: 1 byte - 0x01 (1 byte)
Data: 1 byte - Media control command
0x00 Volume Up / Vol Up
0x01 Volume Down / Vol Down
0x02 Play/Pause / PLAY/PAUSE
0x03 Next Track / NEXT
0x04 Previous Track / PREV
0x05 Fast Forward / FORWARD
0x06 Rewind / REWIND
0x07 Mute / MUTE
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
XU316 Returns
- This command is used by MCU to send media control commands to XU316
- After receiving command, XU316 will convert to corresponding HID command and send to computer
- Suitable for implementing remote control or physical button control of media playback
| Control Code | Function | USB HID Usage |
|---|---|---|
| 0x00 | Volume Up | Increase system volume |
| 0x01 | Volume Down | Decrease system volume |
| 0x02 | Play/Pause | Control media playback state |
| 0x03 | Next Track | Switch to next song |
| 0x04 | Previous Track | Switch to previous song |
| 0x05 | Fast Forward | Fast forward in current track |
| 0x06 | Rewind | Rewind in current track |
| 0x07 | Mute | Toggle system mute state |
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header indicating start of a protocol frame |
| Version | 1 byte | 03 | Indicates this frame is a command sent by MCU to XU316 |
| Command | 1 byte | 21 | Current command is “Media Control” |
| Data Length | 1 byte | 01 | One data byte follows |
| Control code | 1 byte | 02 | Indicates “Play/Pause” |
| Checksum | 1 byte | 26 | Sum of all bytes from 55 to control code, modulo 256 |
Report Playback Audio Stream Format and Type (0x22)¶
XU316 Sends
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x00
Command: 1 byte - 0x22
Data Length: 1 byte - 0x02 (2 bytes)
Data: 2 bytes - Audio stream format and type, see audio stream format and type field
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
MCU Returns
- This command is used by XU316 to report current audio stream format and type to MCU
- Typically sent when playback starts or format changes
- MCU can update display based on this info, such as showing PCM/DSD/MQA/DOP status
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header indicating start of a protocol frame |
| Version | 1 byte | 03 | Indicates this frame is an acknowledgment returned by MCU to XU316 |
| Command | 1 byte | 22 | Acknowledges “Report Playback Audio Stream Format and Type” |
| Data Length | 1 byte | 00 | Pure acknowledgment frame with no data |
| Checksum | 1 byte | 24 | Sum of all bytes from 55 to 00, modulo 256 |
Set Input/Output Mode (0x23)¶
MCU Sends
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x03
Command: 1 byte - 0x23
Data Length: 1 byte - 0x05 (5 bytes)
Data: 5 bytes - Input/output mode, see input/output mode field
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
XU316 Returns
- This command is used by MCU to request XU316 switch to specific input/output mode
- Typically triggered by user operation, such as pressing mode selection button
- XU316 may need to restart to load new mode firmware
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header indicating start of a protocol frame |
| Version | 1 byte | 03 | Indicates this frame is a command sent by MCU to XU316 |
| Command | 1 byte | 23 | Current command is “Set Input/Output Mode” |
| Data Length | 1 byte | 05 | 5 mode bytes follow |
| Input/output mode | 5 bytes | 02 00 00 00 00 | Example target mode data; definitions depend on product specification |
| Checksum | 1 byte | 2C | Sum of all bytes from 55 to the last mode byte, modulo 256 |
Send Playback Volume (0x24)¶
XU316 Sends
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x00
Command: 1 byte - 0x24
Data Length: 1 byte - 0x02 (2 bytes)
Data: 2 bytes
Byte 1: Left channel (0xFF Mute, 0-0dB, -127: -127dB)
Byte 2: Right channel (0xFF Mute, 0-0dB, -127: -127dB)
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
MCU Returns
- This command is used by XU316 to report current playback volume to MCU
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header indicating start of a protocol frame |
| Version | 1 byte | 03 | Indicates this frame is an acknowledgment returned by MCU to XU316 |
| Command | 1 byte | 24 | Acknowledges “Send Playback Volume” |
| Data Length | 1 byte | 00 | Pure acknowledgment frame with no data |
| Checksum | 1 byte | 26 | Sum of all bytes from 55 to 00, modulo 256 |
Send Recording Volume (0x25)¶
XU316 Sends
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x00
Command: 1 byte - 0x25
Data Length: 1 byte - 0x01 (1 byte)
Data: 1 byte - 0xFF Mute, 0-0dB -127: -127dB
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
MCU Returns
- This command is used by XU316 to report current microphone recording volume to MCU
- Reserved command, currently not used
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header indicating start of a protocol frame |
| Version | 1 byte | 03 | Indicates this frame is an acknowledgment returned by MCU to XU316 |
| Command | 1 byte | 25 | Acknowledges “Send Recording Volume” |
| Data Length | 1 byte | 00 | Pure acknowledgment frame with no data |
| Checksum | 1 byte | 27 | Sum of all bytes from 55 to 00, modulo 256 |
Switch MCLK (0x26)¶
MCU Sends
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x03
Command: 1 byte - 0x26
Data Length: 1 byte - 1
Data: 1 byte - 0: Internal MCLK, 1: External MCLK
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
XU316 Returns
- This command is used by XU316 to control switching master clock source
- Can switch between using internal clock or external clock
- Important for certain audio application scenarios requiring precise synchronization
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header indicating start of a protocol frame |
| Version | 1 byte | 03 | Indicates this frame is a command sent by MCU to XU316 |
| Command | 1 byte | 26 | Current command is “Switch MCLK” |
| Data Length | 1 byte | 01 | One data byte follows |
| Data | 1 byte | 01 | Switch to external MCLK; if 00, switch to internal MCLK |
| Checksum | 1 byte | 2A | Sum of all bytes from 55 to last data byte, modulo 256 |
Set Unmute (0x27)¶
Send Audio Format Time Delay (0x28)¶
Report USB Connection Status (0x29)¶
XU316 Sends
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x00
Command: 1 byte - 0x29
Data Length: 1 byte - 0x01 (1 byte)
Data: 1 byte - USB connection status
0x00 USB disconnected / not connected
0x01 USB connected
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
MCU Returns
- This command is used by XU316 to report the current USB connection status to the MCU
- When the USB connection status changes (connect or disconnect), XU316 proactively sends this command
- The MCU can use this information to update the UI or adjust related functions
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header indicating start of a protocol frame |
| Version | 1 byte | 03 | Indicates this frame is an acknowledgment returned by MCU to XU316 |
| Command | 1 byte | 29 | Acknowledges “Report USB Connection Status” |
| Data Length | 1 byte | 00 | Pure acknowledgment frame with no data |
| Checksum | 1 byte | 2B | Sum of all bytes from 55 to 00, modulo 256 |
Set Mute Pin Inversion (0x30)¶
MCU Sends
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x03
Command: 1 byte - 0x30
Data Length: 1 byte - 0x01
Data: 1 byte
B0: Inversion flag
0x00 = Normal logic (High level unmute, Low level mute)
0x01 = Inverted logic (Low level unmute, High level mute)
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
XU316 Returns
- This command is used to set inversion logic for the Mute pin output
- Use this command when certain hardware designs have opposite Mute polarity from default
- The configuration is automatically saved to Flash and persists after power-off
- Takes effect immediately and returns current status
- Mute pin polarity is opposite to default in hardware design
- Need to adapt different hardware revisions of devices
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header |
| Version | 1 byte | 03 | Sent by MCU to XU316 |
| Command | 1 byte | 30 | Set Mute pin inversion |
| Data Length | 1 byte | 01 | 1 data byte follows |
| Inversion flag | 1 byte | 01 | 0x01 = inverted logic |
| Checksum | 1 byte | 34 | Sum of all bytes from 55 to inversion flag, modulo 256 |
Get Current Audio Format (0x31)¶
MCU Sends
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x03
Command: 1 byte - 0x31
Data Length: 1 byte - 0x00
Data: 0 bytes
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
XU316 Returns
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x00
Command: 1 byte - 0x31
Data Length: 1 byte - 0x02 (2 bytes)
Data: 2 bytes
Byte 0: Audio stream format, see section 4.3 Audio Stream Format
Byte 1: Audio type, see section 4.3 Audio Type
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
- This command is used by MCU to query current playback audio stream format and type from XU316
- The return format is consistent with the 0x22 proactive report command
- If the audio type is DSD and the format is AUDIO_44100, XU316 will correct it to PCM in the response
- If no valid audio stream is present, returns
0xFF 0x00
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header indicating start of a protocol frame |
| Version | 1 byte | 03 | Indicates this frame is a command sent by MCU to XU316 |
| Command | 1 byte | 31 | Current command is “Get Current Audio Format” |
| Data Length | 1 byte | 00 | No additional data |
| Checksum | 1 byte | 33 | Sum of all bytes from 55 to 00, modulo 256 |
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header indicating start of a protocol frame |
| Version | 1 byte | 00 | Indicates this frame is returned by XU316 to MCU |
| Command | 1 byte | 31 | Response for “Get Current Audio Format” |
| Data Length | 1 byte | 02 | Two data bytes follow |
| Audio stream format | 1 byte | 03 | Current format is AUDIO_96000 (96kHz) |
| Audio type | 1 byte | 00 | Current type is PCM |
| Checksum | 1 byte | 35 | Sum of all bytes from 55 to last data byte, modulo 256 |
DAC Configuration Selection (0xF0)¶
MCU Sends
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x03
Command: 1 byte - 0xF0
Data Length: 1 byte - 4
Data: 4 bytes
Byte 0: 0: Enable I2C DAC configuration 1: Disable I2C DAC configuration
Byte 1 - 3: reserved
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
XU316 Returns
- Test command for MCU to set DAC configuration selection in XU316. Let XU316 configure DAC via DAC I2C or MCU configure DAC itself
- This command is product-specific and not supported by all products. Please refer to product specification for support details.
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header indicating start of a protocol frame |
| Version | 1 byte | 03 | Indicates this frame is a command sent by MCU to XU316 |
| Command | 1 byte | F0 | Current command is “DAC Configuration Selection Command” |
| Data Length | 1 byte | 04 | 4 data bytes follow |
| Byte 0 | 1 byte | 00 | Enable XU316 to configure DAC via I2C |
| Byte 1-3 | 3 bytes | 00 00 00 | Reserved bytes, all set to 00 in this example |
| Checksum | 1 byte | F6 | Sum of all bytes from 55 to the last data byte, modulo 256 |
Get Firmware Version Command (0xF1)¶
MCU Sends
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x03
Command: 1 byte - 0xF1
Data Length: 1 byte - 2
Data: 2 bytes -
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
XU316 Returns
- Get firmware version
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header indicating start of a protocol frame |
| Version | 1 byte | 03 | Indicates this frame is a command sent by MCU to XU316 |
| Command | 1 byte | F1 | Current command is “Get Firmware Version Command” |
| Data Length | 1 byte | 02 | Two data bytes follow |
| Data | 2 bytes | 00 00 | Reserved bytes, set to 00 as placeholder in this example |
| Checksum | 1 byte | F5 | Sum of all bytes from 55 to the last data byte, modulo 256 |
Query Complete Version Number (0xF3)¶
MCU Sends
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x03
Command: 1 byte - 0xF3
Data Length: 1 byte - 0x00
Data: 0 bytes - none
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
XU316 Returns
- This command is used by MCU to query the complete firmware version number from XU316
- Unlike the 0xF1 command (which only returns a 3-byte BCD major version J.M.N), 0xF3 returns the complete ASCII version string
- Version string format is
<model>_v<major>.<minor>.<revision>_b<build> - For example, user firmware returns
hf87611_v8.1.0_b01, factory firmware returnshf87611_v5.5.8_b01
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header indicating start of a protocol frame |
| Version | 1 byte | 03 | Indicates this frame is a command sent by MCU to XU316 |
| Command | 1 byte | F3 | Current command is “Query Complete Version Number” |
| Data Length | 1 byte | 00 | No additional data |
| Checksum | 1 byte | F5 | Sum of all bytes from 55 to 00, modulo 256 |
Command Example
Field Breakdown
| Byte Segment | Length | Example | Description |
|---|---|---|---|
| Frame Header | 2 bytes | 55 AA | Fixed frame header indicating start of a protocol frame |
| Version | 1 byte | 00 | Indicates this frame is returned by XU316 to MCU |
| Command | 1 byte | F3 | Response for “Query Complete Version Number” |
| Data Length | 1 byte | 12 | 18 data bytes follow |
| Version string | 18 bytes | 68 66 38 37 36 31 31 5F 76 38 2E 31 2E 30 5F 62 30 31 | ASCII string hf87611_v8.1.0_b01 |
| Checksum | 1 byte | C5 | Sum of all bytes from 55 to the last data byte, modulo 256 |
HID Passthrough Data to MCU via XU316 (0xEE)¶
XU316 Sends
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x00
Command: 1 byte - 0xEE
Data Length: 1 byte - 0x39 (57 bytes), due to HID protocol limitation, data length must be 57 bytes
Data: 57 bytes - Due to HID protocol limitation, passthrough data must be 57 bytes
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
MCU Returns (can return multiple frames)
Frame Header: 2 bytes - 0x55aa
Version: 1 byte - 0x03
Command: 1 byte - 0xEE
Data Length: 1 byte - 0x39 (57 bytes), due to HID protocol limitation, data length must be 57 bytes
Data: 57 bytes - Due to HID protocol limitation, passthrough data must be 57 bytes
Checksum: 1 byte - Sum of all bytes from frame header, modulo 256
- This command is used for HID to initiate passthrough data to MCU via XU316
- Generally the passthrough data is MCU OTA data or MCU data replied to HID
Typical Business Flows¶
Example Notes
The byte sequences in this section are derived from the base protocol frame format (checksum = sum of all bytes from frame header, modulo 256), for development reference; mode values in the examples are from the product datasheet section 2.1 table — each product follows its own datasheet.
Flow 1: Device Startup Handshake¶
After power-on, XU316 and MCU complete the startup handshake in the following order; business commands can only be used after the handshake completes:
sequenceDiagram
participant X as XU316
participant M as MCU
X->>M: 0x00 Start-up (with basic info / power-on config CRC)
M-->>X: Startup options (set 0x01/0x02 bits as needed)
opt Update basic info
X->>M: 0x01 Read product info
M-->>X: 60-byte product basic info
end
opt Update power-on config
X->>M: 0x02 Read power-on config
M-->>X: 14-byte power-on config
end
X->>M: 0x03 Get current input/output mode
M-->>X: 5-byte mode value (see datasheet section 2.1 table)
X->>M: 0x04 Get current user config
M-->>X: 14-byte user config
X->>M: 0x05 Startup complete
M-->>X: AcknowledgmentComplete byte formats and timing details of each command: see the "Device Startup and Initialization" chapter of "XU316 UART Base Protocol".
Flow 2: Switch Input/Output Mode (0x23)¶
Example: switch to S/PDIF1 input mode (mode value 0x10, 0x80, 0x65, 0x10, 0x03, from the product datasheet section 2.1 table).
MCU Sends:
| Byte Segment | Example | Description |
|---|---|---|
| Frame Header | 55 AA | Fixed frame header |
| Version | 03 | MCU→XU316 command |
| Command | 23 | Set input/output mode |
| Data Length | 05 | 5 mode bytes follow |
| Mode data | 10 80 65 10 03 | Target mode value (see product datasheet section 2.1 table) |
| Checksum | 32 | Sum of all bytes from frame header, modulo 256 |
XU316 Returns: 55 AA 00 23 00 22 (pure acknowledgment frame)
Restart After Mode Switch
XU316 may need to restart to load the new mode firmware. After restart, the device repeats the startup handshake flow (the restart reason field in the 0x00 command is 0x01 mode switch restart); the MCU should respond again as in Flow 1.
Flow 3: Receive Playback Volume Report (0x24)¶
After the user adjusts volume on the computer, XU316 proactively reports the current playback volume to MCU (example: both channels at -24dB, i.e. 0xE8):
XU316 Sends:
| Byte Segment | Example | Description |
|---|---|---|
| Frame Header | 55 AA | Fixed frame header |
| Version | 00 | XU316→MCU data |
| Command | 24 | Send playback volume |
| Data Length | 02 | 2 volume bytes follow |
| Left channel | E8 | -24dB (0xFF is Mute, 0 is 0dB) |
| Right channel | E8 | -24dB |
| Checksum | F5 | Sum of all bytes from frame header, modulo 256 |
MCU Returns: 55 AA 03 24 00 26 (pure acknowledgment frame)
Flow 4: Media Control — Play/Pause (0x21)¶
MCU-side button triggers play/pause (control code 0x02); XU316 converts it to an HID command sent to the computer:
MCU Sends: 55 AA 03 21 01 02 26
XU316 Returns: 55 AA 00 21 00 20 (pure acknowledgment frame)
Other control codes (volume up/down, previous/next track, fast forward, rewind, mute) are listed in the mapping table of the 0x21 command details; the frame format is identical, only the data byte and checksum differ.
Flow 5: Query Current Audio Format (0x31)¶
MCU Sends: 55 AA 03 31 00 33
XU316 Returns (example: 96kHz PCM):
| Byte Segment | Example | Description |
|---|---|---|
| Audio stream format | 03 | AUDIO_96000 (96kHz); full table in base protocol section 4.3 |
| Audio type | 00 | PCM |
Flow 6: Get Firmware Version (0xF1)¶
MCU Sends: 55 AA 03 F1 02 00 00 F5
XU316 Returns (example: V1.2.5):
| Byte Segment | Example | Description |
|---|---|---|
| Data Length | 03 | 3-byte version number |
| Version data | 01 02 05 | Major.Minor.Revision (V1.2.5) |
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