Too bad the guy only gives out HEX files.
Otherwise, we could see what special magic he has, to cancel out the tolerance of crystals.
DT
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Too bad the guy only gives out HEX files.
Otherwise, we could see what special magic he has, to cancel out the tolerance of crystals.
DT
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Finally, Got the accuracy
Hi Darrel,
Some where Josepino had mentioned on his site that he had used Roman Black's one_sec.asm routine in his clocks (maybe he mentioned this by accident).
I tried making a similar program in PBP but had no success, till now.
Finally i got the progam running. its the exactly same one_sec.asm routine running with instant interrupts, and guess what,... it worked, and really accurately...
Its even more accurate than the Elapsed Timer...
I'll post the code so that it may be useful for someone...
(I'm not as mean and selfish as Josepino...
and thanks a lot for the instant interrupts program...
Chiao...
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Elapsed Timer
Hello shahidali55,
It can publish or to send to my mail [email protected] the code and complete circuit since is very interesting its project, congratulations for its idea!.
Leonard
Regards
Originally Posted by shahidali55
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shahidali55,
Pardon my stubborness!
Sometimes I get so defensive, I don't recognize when someone knows better.
I've tried your code, and there's definately a big difference.
But now, I must know how much, and more importantly why.
Fortunately, with Instant Interrupts, it was easy to combine both timers into one program, and I'm running it on a telnet server, in case you (or anyone else) wants to see too. I started the test at 12:15 am PST, and have set the time as close as possible relative to GMT. This screen capture was 30 seconds later.
If you have Hyperterminal installed you can see the results by using the TimerTest.ht file in the .zip below. Hopefully in a few days the error will be more evident. T1 is the Elapsed timer, and T0 is your new timer.
password: guest
then type data and press enter
<br>
Here's a reference time http://nist.time.gov/timezone.cgi?Pacific/d/-8/java
Although i started about 1/2 second late.
<br>
Test completed. .zip file removed.
Last edited by Darrel Taylor; - 28th June 2006 at 07:53. Reason: Removed zip
DT
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Problems
Hello, I have not managed to compile I cosay give errors me, can help me please.
Thanks
Leonard
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Hi Leonard,
To compile this code you need to have Darrel's Instant interrupt file (DT_INTS-14.bas) in the folder along with the source code...
You also need to have enabled the "Use MPASM" option in the compile and options menu...
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No found DT_INTS-14.bas
Hello,
Don't I find the "DT_INTS-14.bas" in none of the folders, can send it please to my mail?. [email protected]
Thank you
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Hmmm,
I fully expected the test to show that the new timer would keep accurate time and give a good indication how far off the Elapsed Timer was, but instead after 24hrs, the Elapsed Timer (T1) was still within 1 second of actual time, and the new timer (T0) had gained almost 8 seconds. Also, my PC's clock was 3 seconds slow. (interesting, but not relevant)<br>
<br>
Since then, I've turned Roman's routine into a subroutine and ran it in loops just to verify it's counting, and can say that it does accuratly count 1 million instructions per second. Well, actually, it counts 3 seconds at 999,936 instructions and every 4th second at 1,000,192. Which over the 4 seconds averages out to exactly 4,000,000 instructions. So in a perfect world, with a 4.000000mhz crystal, it should count perfect time. But it doesn't. (in my case)
This leads me to beilieve that My crystal is off.
So, continuing with with the perfect world theory...
There's 86,400 seconds per day
or 86,400,000,000 instructions per day
an additional 8 seconds is 8,000,000 instructions
for a total of 86,408,000,000
that divided by the 86,400 seconds per day gives
1,000,092.593 instructions per day or a freq. of
4,000,370.37 hz.
That's 93PPM off center frequency. So I've either got a crystal that's almost twice the tolerance. OR I'm still missing something big time.
<br>
DT
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No, It wasn't an accident.
No, I didn't mention the Roman Black's web page by accident.
I good to know there is people not mean and selfish like JosePino. Anyway, I found quite interesting this forum.
Regards,
Jose Pino
www.josepino.com
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......................
Last edited by shahidali55; - 9th July 2006 at 17:34.
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Hello Jose Pino,
Hello Jose Pino,
I found your LED and LCD clock projects very interesting...
Why dont you put your source codes online??? Its not like everyone is looking to make money by selling your codes or something...
Most of them, like me, just want to learn more in this wonderful world of microcontrollers!!!
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Microcontroller Projects
About one year and half ago, I was so mad and upset when I found some of my projects were used for commercial applications on Europe, specifically on Germany. After that, I decided not to post source codes and protect it with copyrights and patents.
Later, I started to receive some hate mail (Specially from Spanish-speaking readers) accusing me that my projects are stealed from other web pages, so I started to post algorithms of my projects. (only some of them)
Now, I receive many e-mails from hungy-of-knowledge people over the world asking me for source codes. At this point, I'm thinking seriously to make the source code available to the public.
As you can see, Is really hard to make everybody happy. So, I guess the best thing to do is to make the source code available for everybody. It may take a while until I have some time available to find the source code and put it online.
Regards,
Jose Pino
www.josepino.com
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Hello Josepino,
It'll be great if you put your souce codes online...
Thanks for considering my posts...
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