ESP32 more than two I2S communication ports (tree)

Projects Networking, Protocols, and Devices
1

Hello,
for a project I would like to connect 3 devices on I2C connection but unfortunately they have same address (AS5600).
My specific question is:
I2C is a protocol that could be addressed on almost all pins of ESP32, why I cannot have tree connections?
I was thinking to edit the TwoWire class, the standard Wire library for ESP32 but before lose time for nothing, I would like to know if there is an hardware limitation doing this.
Does someone tried already or know why seems impossible to have tree connections?

Thanks in advance
Andrea

2

The ESP32 only has 2 I2C hardware ports, Inter-Integrated Circuit (I2C) - ESP32 - — ESP-IDF Programming Guide latest documentation.

3

The AS5600 I2C address is fixed, so you either need three I2C ports (one could be software I2C), or use this I2C multiplexer.

4

It means the idea to add a pure software I2C protocol port is possible?
Of course I have to write or find a software implementation of I2C.. do you feel it could work considering the frequency it should guarantee and standard GPIO handling?

5

It has been done many times. Search for "arduino software i2c", or SoftWire.

6

Thanks, I understood, basically it has max 2 embedded protocol handling...

7

Thanks a lot, I searched I2C software but I did not found the library yet.. :slight_smile:
Very good, I will try.
Thanks