Hi All,
Up until now we've been interfacing my Motorola M12+T's using the Oncore
software. However, at this point we are trying to have it interfaced
directly to a FPGA. To my mind this should be simple - the commands are
discriminated (framed) by looking at the start and terminating bytes
sequenc
+userguide.pdf
From: Stephan Sandenbergh <[EMAIL PROTECTED]>
To: Discussion of precise time and frequency measurement
Sent: Wednesday, November 19, 2008 8:29:59 AM
Subject: [time-nuts] M12+T ASCII interface - I'm confused?
Hi All,
Up until now we've bee
ecise time and frequency measurement
Subject: [time-nuts] M12+T ASCII interface - I'm confused?
Hi All,
Up until now we've been interfacing my Motorola M12+T's using the Oncore
software. However, at this point we are trying to have it interfaced
directly to a FPGA. To my mind this sh
I have just the beast for you - an HP 4951C with serial adapter!!! That well
let you really see what's in the datastream.
Dave
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Hi Stephan:
Check the manual for "stuffing", it's not a Thanksgiving term here but has to
do with what happens when a byte in a binary data stream (the data in the
Motorola protocol is all binary, not ASCII) is the same as the ASCII "@"
character. This means that the length of a packet is vari
Stephan,
Ah, it's not a stupid question -- I think all of us who have written
code to interface with GPS receivers have had to deal with this.
Some GPS protocols use escape characters, but the Oncore
binary protocol doesn't. There are five clues to robustly parsing
a complete message:
1) starts
Tom Van Baak wrote:
> Stephan,
>
> Ah, it's not a stupid question -- I think all of us who have written
> code to interface with GPS receivers have had to deal with this.
>
> Some GPS protocols use escape characters, but the Oncore
> binary protocol doesn't. There are five clues to robustly parsing
Mittwoch, 19. November 2008 15:30
> An: Discussion of precise time and frequency measurement
> Betreff: [time-nuts] M12+T ASCII interface - I'm confused?
>
>
> Hi All,
>
> Up until now we've been interfacing my Motorola M12+T's using
> the Oncore software.
Tom,
Thank you for the valuable inputs. I was quietly hoping that I was
misunderstanding the protocol in some way.
My gut tells me that <@><@> would be believable more than
say 95% (if not 99%) of the time. I've got the following observations:
- 95% is a bad number in accurate timing applicatio
Hi Bruce,
Yes - at this point an external processor is not a real option.
Are you aware of open source code that I could try out?
In hind sight, I should've put a microprocessor core onto the FPGA to do all
the management kind of tasks.
Regards,
Stephan.
No need to use an external processor j
ussion of precise time and frequency measurement
> > Betreff: [time-nuts] M12+T ASCII interface - I'm confused?
> >
> >
> > Hi All,
> >
> > Up until now we've been interfacing my Motorola M12+T's using
> > the Oncore software. However, at this
;
> To: Discussion of precise time and frequency measurement <
> time-nuts@febo.com>
> Sent: Wednesday, November 19, 2008 8:29:59 AM
> Subject: [time-nuts] M12+T ASCII interface - I'm confused?
>
> Hi All,
>
> Up until now we've been interfacing my Motorola M12+T
> My gut tells me that <@><@> would be believable
> more than say 95% (if not 99%) of the time. I've got the following
> observations:
I suggest that you debug things in software and then figure out how to
implement that algorithm in the FPGA. You can rearrange code and try again
to make it
AIL PROTECTED] Im Auftrag von Stephan Sandenbergh
> Gesendet: Donnerstag, 20. November 2008 11:48
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] M12+T ASCII interface - I'm confused?
>
>
> Hi Ulrich,
>
> Sure - among other thin
Stephan Sandenbergh wrote:
> Hi Bruce,
>
> Yes - at this point an external processor is not a real option.
>
> Are you aware of open source code that I could try out?
>
> In hind sight, I should've put a microprocessor core onto the FPGA to do all
> the management kind of tasks.
>
> Regards,
>
> St
> Tom,
>
> Thank you for the valuable inputs. I was quietly hoping that I was
> misunderstanding the protocol in some way.
>
> My gut tells me that <@><@> would be believable more than
> say 95% (if not 99%) of the time. I've got the following observations:
>
> - 95% is a bad number in accurate
t;> From: Stephan Sandenbergh <[EMAIL PROTECTED]>
>> To: Discussion of precise time and frequency measurement <
>> time-nuts@febo.com>
>> Sent: Wednesday, November 19, 2008 8:29:59 AM
>> Subject: [time-nuts] M12+T ASCII interface - I'm confused?
>>
>>
Hi Stephan:
I was wrong about the stuffing. Got confused with other protocols.
All the Motorola @@ packets are a fixed length.
Have Fun,
Brooke Clarke
http://www.prc68.com
Brooke Clarke wrote:
> Hi Stephan:
>
> Check the manual for "stuffing", it's not a Thanksgiving term here but has to
> d
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