Well just in case this helps, the DAC on my Tbolt is currently reading
-0.056013V. As before, it shows up OK on Tboltmon.exe and Lady Heather,
reads all zeroes on the LCD monitor.
And just in case it is of any use, my Tbolt details from LH are:
App: 3.0 27 Jun 2002
GPS: 10.2 14 Nov 2001
Mfg: 10.00 24 Mar 2003
Ser: 0.80253721
I would have thought 5 minutes of testing would be more than adequate, I
usually work on the principle that if there's no smoke it must be
working fine ;-)
David, G4IRQ
On 12/05/2011 11:46, [email protected] wrote:
The DAC voltage routine is the worst hack I have ever come up with (that was a
close call....)
The processor is an 8051 and the SDCC compiler I used does not have the floating point
math library, so I had to decode the DAC voltage "by hand" and it is quite
possible that the routine breaks down for some DAC values which I did not encounter here
(I have 3 TBolts).
I would be surprised if any bug could have survived the stringent 5 minutes of
testing I subjected this project to but who knows... :)
I will look at it. I also have a version of the code compiled with a different
compiler (Keil) to try if someone wants to, but I doubt the problem is with the
compiler.
For those who have seen the wiki page for the GPSMon project, there is a new
firmware version which can display local time (compensates for GPS offset, time
zone and DST). However, the DAC routine is unchanged.
Didier KO4BB
------Original Message------
From: Mark Sims
Sender: [email protected]
To: Time-Nuts
ReplyTo: Time-Nuts
Subject: [time-nuts] Tbolt LCD Monitor - No DAC reading
Sent: May 12, 2011 2:56 AM
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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Sent from my BlackBerry Wireless thingy while I do other things...
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