Re: Consultation: connecting I2C/SPI devices to network

[Kuldeep Joshi via Tech-talk <tech-talk@aps.anl.gov>]

 Hello Florian,

I have superficially seen your code for the I2C to CA/PVA module.

I have a quick query regarding this, 

you have patched the asyn module due to some issue. Can you please elaborate on this.

If I want to use the asyn module along with Modbus, what will be the issues faced while using this patched module??

Regards,

Kuldeep Joshi

Date: Mon, 15 Dec 2025 11:30:39 +0100
From: Florian Feldbauer <florian@ep1.ruhr-uni-bochum.de>
To: tech-talk@aps.anl.gov
Subject: Re: Consultation: connecting I2C/SPI devices to network
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Hey Gabriel,


I typically use a Raspberry Pi to readout devices via I2C.
For this task I wrote a small i2c device support module, that uses
Stream Device + Asyn (https://urldefense.us/v3/__https://github.com/ffeldbauer/drvAsynI2C__;!!G_uCfscf7eWS!dYsKvtCymp2YJMjpT9hlV9epBG8rvC8U0HFXjj2UxUg0CSKQmX3WB7Ztk9HxUrleo9Jl6mVuLC1Yale1CcceS7vzniRnZn_gqG4$ )


It does not make the I2C communication directly accessible on network,
but it makes all the data points accessible via CA/PVA through an EPICS IOC.


If you really want to have a I2C to Ethernet bridge, I would most likely
use a RP2040 or ESP32 microcontroller and implement a simple UDP or TCP
protocol exchanging either ASCII or raw "strings" containing the data.


HTH,
Florian



On 12/15/25 10:43, Gabriel Fedel via Tech-talk wrote:
> Dear tech-talk,
>
> Any experience or suggestion of bringing hardware communicating I2C
> and/or SPI to be accessible on network?
> Maybe even some EPICS integration experience on them ?
>
> Thanks in advance

--
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Dr. Florian Feldbauer
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