[GPS_Standard] GPS_Standard Digest, Vol 34, Issue 1

[Martein Bakker]

Hi Roberto,

I think that is an error in the datasheet overview of the 2221. I have 
recompiled the firmware with the 18F2221 include file and I had to fix 3 
errors having to do with different names of the configuration bits.

Now when I use this new firmware compiled for 2221, I have exactly the same 
result. It does not count properly. The hexfiles only differ for the bits 
that describe the configuration bits. And that is correct that is also a 
visible difference the datasheet.

If you go through the datasheets of the 2220 and 2221 side by side on the 
pages that describe the timer counter hardare, there is no difference to be 
found.

I am going to leave it now. I am not a PIC expert and don't want to become 
one Hi!

Best 73's,
Martein
pa3ake

----- Original Message ----- 
From: "Roberto Barrios" <rbarrioss at msn.com>
To: <gps_standard at mailman.qth.net>
Sent: Monday, May 17, 2010 4:20 PM
Subject: Re: [GPS_Standard] GPS_Standard Digest, Vol 34, Issue 1


> Hi Martein,
>
> Now I'm not so sure... Looking at page 3 (as per AdobeReader) of the 
> 18F2220
> datasheet, lower right corner, you can read "timers 8/16bit: 2/3", but 
> there
> is no more info on the fifth counter, in page 10 it says this part has 4
> timers. Now I am not sure where the issue is.
>
> Regards,
> Roberto EB4EQA
>
> -----Original Message-----
> From: gps_standard-bounces at mailman.qth.net
> [mailto:gps_standard-bounces at mailman.qth.net] On Behalf Of
> gps_standard-request at mailman.qth.net
> Sent: domingo, 16 de mayo de 2010 18:00
> To: gps_standard at mailman.qth.net
> Subject: GPS_Standard Digest, Vol 34, Issue 1
>
> Send GPS_Standard mailing list submissions to
> gps_standard at mailman.qth.net
>
> To subscribe or unsubscribe via the World Wide Web, visit
> http://mailman.qth.net/mailman/listinfo/gps_standard
> or, via email, send a message with subject or body 'help' to
> gps_standard-request at mailman.qth.net
>
> You can reach the person managing the list at
> gps_standard-owner at mailman.qth.net
>
> When replying, please edit your Subject line so it is more specific than
> "Re: Contents of GPS_Standard digest..."
>
>
> Today's Topics:
>
>   1. PIC18F2220 versus PIC18F2221 (Martein Bakker)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sat, 15 May 2010 21:47:28 +0200
> From: "Martein Bakker" <martein at xs4all.nl>
> Subject: [GPS_Standard] PIC18F2220 versus PIC18F2221
> To: <gps_standard at mailman.qth.net>
> Message-ID: <574096AB150146CFBD63DFAE3EFE9A85 at mhbp5q>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi list!
>
> I have succesfully built the VE2ZAZ GPS standard.
>
> Initially I used PIC18F2221 as I could not get PIC18F2220. The 18F2221 is
> supposed to be the newer and better part and successor of 18F2220. I went
> through the datasheets and could not see any difference that would prevent
> the 18F2221 to work in this application. However it failed to work 
> partially
> in practice. Montrol software could talk with it, but the measured 
> frequency
> was always 0 and strange enough the frequency difference was not 0, but 
> the
> MSB byte was always 0! Obviously it did not lock.
>
> Does anyone know why the 18F2221 does not work with this application? It
> would be great if the firmware is compatible with this device as it is 
> much
> cheaper.
>
> Best regards
> Martein
> pa3ake
>
> ------------------------------
>
> _______________________________________________
> GPS_Standard mailing list
> GPS_Standard at mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/gps_standard
>
>
> End of GPS_Standard Digest, Vol 34, Issue 1
> *******************************************
>
> ______________________________________________________________
> GPS_Standard mailing list
> Home: http://mailman.qth.net/mailman/listinfo/gps_standard
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GPS_Standard at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>