[Coco] I2C - Is it possible?

[John Kent]

On 24/07/2011 6:26 PM, John Kent wrote:
>
>
> 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.
>
When I say bit bashing I mean implementing an I2C interface. I used it 
to talk to serial flash memory and a calendar clock chip.

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