Re: gEDA-user: furnace update

[Steven Michalske <smichalske@xxxxxxxxx>]

I am curious about what the design goals were with this project.

4 zones,  why the R8C per zone,  etc etc.

The requirements you had for the design.

Steve

On Nov 14, 2007, at 1:09 PM, DJ Delorie wrote:

>
> For those of you who were at the meeting Sunday and heard me ramble on
> about my furnace issues...
>
> I think I figured it out.  The gumstix could start a new i2c
> transaction so soon after the previous i2c transaction ended, that the
> r8c's didn't have enough time to properly close the old transaction
> and be ready for the new one, even when they were for different chips.
> I added a 50uS delay in the gumstix after each i2c transaction and it
> seems to have solved all the i2c problems.
>
> I also moved the serial transmit task from an interrupt handler to the
> main loop.  The old handler occasionally got confused and stopped
> transmitting, but I don't know if that was due to other problems.  It
> also tried to be fancy about detecting the end of physical
> transmission vs just an empty queue (the lcd's have some timing
> constraints) which I don't worry about any more, I just added an extra
> mS to the appropriate delays.
>
> Anyway, it's working fine now so I'm not going to change it back ;-)
>
>
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