[Coco] I2C - Is it possible?

[Bob Devries]

John,

the MM/1 computer has an I2C port, but to the best of my knowledge no 
software was ever produced for it.

Are you aware of anything that uses the 68070 CPU's built-in I2C? It would 
be great to be able to use that port to read a clock, since the clock in my 
MM/1 has now completely failed.

Regards, Bob Devries
Dalby, QLD, Australia

----- Original Message ----- 
From: "John Kent" <jekent at optusnet.com.au>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Sunday, July 24, 2011 6:26 PM
Subject: Re: [Coco] I2C - Is it possible?


>
>
> On 24/07/2011 5:51 AM, Roger Taylor wrote:
>> At 02:42 AM 7/23/2011, you wrote:
>>> Just wondering if anyone has any idea if it's possible to 'bitbang' an 
>>> I2C interface on the CoCo?
>>>
>>> There so many tiny I2C circuits available (including VGA) that I was 
>>> wondering if there was any way to bring some of these devices to the 
>>> CoCo?
>>
>> Nick, what I've discovered is that some I2C capable modules also support 
>> basic serial using other pins.
>
> I sent Nick some code for bit bashing a 68901 MFP I/O port for the 68000. 
> It should be possible to adapt it to the 6809. You do need a bi direction 
> data port with pull ups. You'd have to use something like a 6821 PIA. 
> Alternately use a PIC or AVR microprocessor with RS232 to I2C interface.
>
> John.
>
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