AVR-Chat

Hi all ,
        I found a circuit which may help me in the project but there
was a problem that the connections aren't clear on the schematic ...
like the pins CTS, Rx, Tx & RTS/DTR ... genrally i mean the
connections between the Level Shifter & the Programmer itself .. i
read the ATmega 8535 data sheet .. but i couldn't deduce anything ...
can any one help me ?? 
                                    Ahmad El-Saied

http://f5.grp.yahoofs.com/v1/AIYoQnpT4T1_qD3Uz5m0kXdIBMT25riJE6WDsy-e36vSHfcQ-zXyFvz5sg3A8WyuDG7ZTFTI6bbKfuUf07HICxA7dbb4qfiLhIM/avr-p40b-8535-sch.gif

At 03:26 AM 5/03/2005, you wrote:

>was a problem that the connections aren't clear on the schematic ...
>like the pins CTS, Rx, Tx & RTS/DTR ...


It is rather unclear. The Rx and Tx pins from the level
shifter chip (Max232) go to the Rx and Tx pins of the 8535.
The RTS ans CTS pins (Hardware handshaking) can just be
shorted together. For J1 chose the RTS setting. This should
keep the PC happy and it should work. If you are going to
the trouble of buiding this programmer on Veroboard then I
would suggest again to use a similar programmer that uses
the 2313 because I do some (free) firmware upgrade from time to
time, even though the firmware should be reassemblable (?  :-))
for the 8535. Vasilis Serasidis has lots of info on his website
at www.serasids.gr




Regards

John Samperi

******************************************************
                         Ampertronics Pty. Ltd.
   11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA
          Tel. (02) 9674-6495       Fax (02) 9674-8745
                Email: samperi@ampertronics.com.au
                  Website  http://www.ampertronics.com.au
* Electronic Design   * Custom Products   * Contract Assembly
******************************************************

Hi John,
        So you see that this circuit may be hard to be
realized or you have another one ? - Actually i feel
confused about the serial progrmming process itself
... the data sheet even didn't mention wheather you
have to use a level shifter or not  ...
                              Ahmad El-Saied


 --- John Samperi <samperi@ampertronics.com.au> wrote:


---------------------------------
At 03:26 AM 5/03/2005, you wrote:

>was a problem that the connections aren't clear on
the schematic ...
>like the pins CTS, Rx, Tx & RTS/DTR ...


It is rather unclear. The Rx and Tx pins from the
level
shifter chip (Max232) go to the Rx and Tx pins of the
8535.
The RTS ans CTS pins (Hardware handshaking) can just
be
shorted together. For J1 chose the RTS setting. This
should
keep the PC happy and it should work. If you are going
to
the trouble of buiding this programmer on Veroboard
then I
would suggest again to use a similar programmer that
uses
the 2313 because I do some (free) firmware upgrade
from time to
time, even though the firmware should be reassemblable
(?  :-))
for the 8535. Vasilis Serasidis has lots of info on
his website
at www.serasids.gr




Regards

John Samperi

******************************************************
                         Ampertronics Pty. Ltd.
   11 Brokenwood Place Baulkham Hills, NSW 2153
AUSTRALIA
          Tel. (02) 9674-6495       Fax (02) 9674-8745
                Email: samperi@ampertronics.com.au
                  Website 
http://www.ampertronics.com.au
* Electronic Design   * Custom Products   * Contract
Assembly
******************************************************



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At 08:15 AM 5/03/2005, you wrote:
>Hi John,
>         So you see that this circuit may be hard to be
>realized or you have another one ?

Have you looked at the website I mentioned? The programmer
is not hard to build on veroboard...BUT...you will need
another programmer to program the programmer's chip :-)

>- Actually i feel
>confused about the serial progrmming process itself
>... the data sheet even didn't mention wheather you
>have to use a level shifter or not  ...

It would not be in the 8535 data sheet as you can program
the chip in several ways. IIRC you already have a parallel
port programmer, so you can use it to program either the
8535 or the 2313. If you look at avrfreaks.com and search
for AVR910 you will find firmware for both the 2313 and the
8535 version of the programmer. Don't worry about what goes
on inside the programmer for now, AVR Studio takes care of
that.

Regards

John Samperi

******************************************************
                         Ampertronics Pty. Ltd.
   11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA
          Tel. (02) 9674-6495       Fax (02) 9674-8745
                Email: samperi@ampertronics.com.au
                  Website  http://www.ampertronics.com.au
* Electronic Design   * Custom Products   * Contract Assembly
******************************************************

the site doen't open my friend  !! .. are you sure of
it ?
 --- John Samperi <samperi@ampertronics.com.au> wrote:


---------------------------------
At 08:15 AM 5/03/2005, you wrote:
>Hi John,
>         So you see that this circuit may be hard to
be
>realized or you have another one ?

Have you looked at the website I mentioned? The
programmer
is not hard to build on veroboard...BUT...you will
need
another programmer to program the programmer's chip
:-)

>- Actually i feel
>confused about the serial progrmming process itself
>... the data sheet even didn't mention wheather you
>have to use a level shifter or not  ...

It would not be in the 8535 data sheet as you can
program
the chip in several ways. IIRC you already have a
parallel
port programmer, so you can use it to program either
the
8535 or the 2313. If you look at avrfreaks.com and
search
for AVR910 you will find firmware for both the 2313
and the
8535 version of the programmer. Don't worry about what
goes
on inside the programmer for now, AVR Studio takes
care of
that.

Regards

John Samperi

******************************************************
                         Ampertronics Pty. Ltd.
   11 Brokenwood Place Baulkham Hills, NSW 2153
AUSTRALIA
          Tel. (02) 9674-6495       Fax (02) 9674-8745
                Email: samperi@ampertronics.com.au
                  Website 
http://www.ampertronics.com.au
* Electronic Design   * Custom Products   * Contract
Assembly
******************************************************



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---------------------------------
Yahoo! Groups Links

   To visit your group on the web, go to:
http://groups.yahoo.com/group/AVR-Chat/
 
   To unsubscribe from this group, send an email to:
AVR-Chat-unsubscribe@yahoogroups.com
 
   Your use of Yahoo! Groups is subject to the Yahoo!
Terms of Service.
 

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At 08:54 AM 5/03/2005, you wrote:

>the site doen't open my friend  !! .. are you sure of
>it ?

Avrfreaks seemed to have been down this morning
but www.serasidis.gr worked ok.


Regards

John Samperi

******************************************************
                         Ampertronics Pty. Ltd.
   11 Brokenwood Place Baulkham Hills, NSW 2153 AUSTRALIA
          Tel. (02) 9674-6495       Fax (02) 9674-8745
                Email: samperi@ampertronics.com.au
                  Website  http://www.ampertronics.com.au
* Electronic Design   * Custom Products   * Contract Assembly
******************************************************