IIC Protocol
Note: the host device and the voice interaction module may use different power supplies, but they must share a common ground when connected in order to provide a stable communication level
1. The Voice Interaction Module as Slave
Receive and parse the signal sent by the host:
Wait for an IIC signal interrupt; if data is received on IIC, call the corresponding function according to the register address information received via IIC.
Data processing and feedback:
When the voice interaction module receives a register read command, it needs to call the corresponding send function to send the recognized data to the host device.
2. IIC Device Address and Register Functions
The IIC slave device address of the voice interaction module is 0x2A.
3. Obtaining Command Entries.
Open the command word / playback word protocol list V1_中文 file in the attachments; you can see that the communication protocol starts with 0xFE, 0xED and ends with 0xEE, with 2 bytes in between that are the function type and the ID number respectively.
When the voice interaction module recognizes the “停车” command word, it responds “好的，已停止”. The host controller can read one byte of data, 0x02, from the recognition result register (0xDA); this data is the same as the 4th byte in the send protocol for “停车”.
4. Response Phrase Entries
Response phrase entries are not played back actively; the host controller must set them via IIC before playback occurs (the response phrases of command word entries can also be played back).
The host controller writes one byte — the command word ID number — to the playback register address (0xD1) via IIC, and the voice playback module will play back the corresponding sentence; 0xFF is the ordinary response phrase.
For example:
When the user needs to play “这是红色”, the host controller must write “0x5F” to the playback register (0xD1) via IIC, and the voice interaction module will play back “这是红色”.
5. Function Word Playback Entries
Function word entries can be played back when a command word is recognized, or played back by writing a specific byte via IIC.
The host controller writes one byte — the command word ID number — to the playback register address (0xD2) via IIC, and the voice playback module will play back the corresponding sentence; 0xFF is the ordinary response phrase.
For example:
When the user needs to play “这是红色”, the host controller must write “0x01” to the playback register (0xD2) via IIC, and the voice interaction module will play back “欢迎使用小犀”.
5. Command Word Playback Entries
Command word entries can be played back when a command word is recognized, or played back by writing a specific byte via IIC.
The host controller writes one byte — the command word ID number — to the playback register address (0xD3) via IIC, and the voice playback module will play back the corresponding sentence; 0xFF is the ordinary response phrase.
For example:
When the user needs to play “好的，正在前进”, the host controller must write “0x04” to the playback register (0xD3) via IIC, and the voice interaction module will play back “好的，正在前进”.
