[RFC] Driver for Arduino-as-I2C-adapter

[Angelo Compagnucci]

Hi Alex,

2015-05-19 15:34 GMT+02:00 Angelo Compagnucci <angelo.compagnucci at gmail.com>:
> Hi Alex,
>
> 2015-05-19 13:59 GMT+02:00 Alex Beregszaszi <alex at rtfs.hu>:
>> Hi,
>>
>> Angelo Compagnucci wrote:
>>
>> Dear Bernhard Kraft,
>>
>> 2015-05-18 18:53 GMT+02:00 Bernhard Kraft <kraftb at think-open.at>:
>>
>> But for now I think I will just publish the Arduino sketch and a sample
>> implementation on how to access I2C devices with it.
>>
>> Probably we should stick to other protocol driver implementation, but
>> from a rapid analisys, this will be the second in kernel serial to i2c
>> adapter, so I think there is not such a string standard protocol in
>> this field.
>>
>> Please publish your sketch, I think making the driver is really not a
>> complex matter!
>> Count on me for any help, I really like the idea to have my name on
>> such an interesting project!
>>
>> I have  worked on some I2C drivers for Linux, as well as Arduino and
>> searched for cheaper options countless times.  Yesterday's email made me to
>> search again and really liked the way one of products I've mentioned was
>> structured.
>
> Great! Looking at the kernel, the USB-ISS doesn't have a ready made
> driver. This could be a counter argument cause we will use another I2C
> over UART protocol.
>
>> So I sat down and wrote an Arduino implementation of that specification just
>> to see what the performance would be. You can find it at:
>> https://github.com/axic/dtiic
>
> I had a quick look at code and it seems simple, readable and fastest
> at least to sustain the 400khz mode of i2c.
>
> BTW, I'm thinking on making an arduino code compatible with some of
> the already in kernel driver and i2c-tiny-usb could be a really valid
> candidate. This way we could only ask for a .ino inclusion in mainline
> with some sort of documentation on how to cook a homemade I2C over
> UART bridge.

The only downside of this approach is that we should write something
USB based, not UART, so it will limit the choice of usable Arduino
board to only the Leonardo.
I think we should stick for an serio based driver to be compatible
with all the boards.

I have no problem in writing such a driver, probably I will look into
this in the next few days.

Sincerely, Angelo

>
> Sincerely, Angelo
>
>>
>> Best,
>> Alex
>>
>
>
>
> --
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