[time-nuts] Tbolt LCD Monitor - No DAC reading
David Bobbett
d.bobbett at tiscali.co.uk
Thu May 12 08:15:34 UTC 2011
Now that is interesting! I was beginning to wonder whether the problem
lay with not being able to decode negative DAC values, but I had no way
of testing it. Clearly, as the data is processed correctly in other
programs - and the monitor works in all other respects - that does
rather point to a specific issue with DAC related sub-routines.
The only puzzle is that most of the monitors do work OK as far as I know
- maybe somebody got different versions of the firmware confused - or is
it something else?
David
On 12/05/2011 08:56, Mark Sims wrote:
> I have a sneaking suspicion that I know what is going on...
>
> Ages ago I sent the code for my first TSIP parser to someone (can't remember who... was it Dieder?) who was going to use it in a microcontroller based tbolt monitor. Fluke's monitor is just a lift of that design. Well, my code had a bug in the DAC message processor. If I remember correctly it was something like reading the DAC value as a single precision number, but the tbolt was sending a double precision number (or the other way around).
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