GEX protocol documentation
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gex-docs/UNIT_I2C.md

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# I2C master
## Commands
### WRITE (0x00)
*Request:*
- u16 - slave address
- u8[] - bytes to write
### READ (0x01)
*Request:*
- u16 - slave address
- u16 - number of bytes to read
*Response:*
- u8[] - received bytes
### READ_REG (0x02)
Read a register value. First writes the register number, then reads a number of bytes.
For devices implementing auto-increment, the register width field can be used to read
multiple registers at once.
*Request:*
- u16 - address
- u8 - register number
- u16 - register width (number of bytes to read)
*Response:*
- u8[] - received bytes
### WRITE_REG (0x03)
Write a register; first writes the register number, then (in the same transaction)
the data. If the device supports it, can write multiple registers at once.
*Request:*
- u16 - address
- u8 - register number
- u8[] - bytes to write
## Events
*No events defined for this unit type.*