# i2c-for-esp32
## Extended Arduino Library for I2C Slave on ESP32
This repository contains modifications to the original Arduino library found at https://github.com/gutierrezps/ESP32_I2C_Slave .
The key enhancement enables the sending of longer packets.
Packet Format
The expected packet format is detailed below:
```
[0]: start byte (0x02)
[1]: number of packet length bytes (L)
[2:2+L]: packet length (N)
[2+L]: data[0]
[3+L]: data[1]
...
[N+1+L]: data[N-1]
[N+2+L]: CRC8 of packet length and data
[N+3+L]: end byte (0x04)
```
Feel free to expand on this by adding any installation, usage instructions or any other relevant details as required.
## Python library
We provide a Python library for exchanging bytearrays received in Python.
You can install it using the following command:
```
pip install i2c-for-esp32
```
For usage instructions, please refer to:
https://github.com/iory/i2c-for-esp32/blob/master/examples/radxa_with_atom_echo/radxa_i2c_audio_publisher.py
## Sample
### Radxa with Atom Echo
A sample that communicates with radxa and atom echo to retrieve audio data from a microphone can be found at:
https://github.com/iory/i2c-for-esp32/tree/master/examples/radxa_with_atom_echo
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