Why not simply write your own bit-banged I2C driver?

--Bob

On Fri, Jan 30, 2009 at 5:48 AM, JohnSanderson <john@jscontrols.co.za> wrote:
>  Hello PIC.ers,
>
>  I've been a longtime lurker, only an occasional contributor.
>
>  I have an app. that has been in production now for ~7years using
>  various PICs. Started with the 16F877, then 18F452 and I am being
> `encouraged' to migrate to the modern 18F4520.
>
>  Differences seem minor enough, but the one that is sticking me right now
> is the MSSP in master mode.
> The I2C bus has  3x 8bit expander IO ports (PCF8574s) hanging off it
> and a DS1307 RTC.
> So far, only one of the IO port expanders takes messages from the master,
> the others seem unreadable.
>
>  I haven't (yet) gone the whole hog of stripping down all the source code
> to essentials so that the exact problem can be drilled into.
>
>  Does anyone out there know of any gotchas or pointers in this migration?
>
>
>
>        bestos,  John
>
>  eMail from the desk of John Sanderson.
>  JS Controls cc. Manufacturer and purveyor of Force testing
>  apparatus.
>  john@jscontrols.co.za
>  www.jscontrols.co.za
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