RE: [avr-gcc-list] uisp erased atmega103 id bytes!

[Heinrich Vermeulen]

We had the same problem when we started with the 103.  I changed our version
of uisp 
to ignore the signature bytes and default to the 103 when FF FF FF signature
bytes were detected.  This will pgm and verify correctly then.  The Windows
avrisp has an option to ignore these bytes.  Maybe we should alter uisp and
give the user the option to overide automatically selected options.

Our rep said these bytes are wiped because of funny sequences on the RST and
VCC lines (I think) during programming.  The best option is to get a 128
instead.

Heinrich Vermeulen

> -----Original Message-----
> From: David Breeze [mailto:address@hidden
> Sent: 03 July 2002 01:16
> To: address@hidden; address@hidden;
> address@hidden
> Subject: Re: [avr-gcc-list] uisp erased atmega103 id bytes!
> 
> 
> Hi
> 
> I have had devices apparently die when serial programming,  
> The only solution I have found, to bring them back to life, 
> is to use a parallel programmer, in my case the STK500 board 
> or for some parts the dataman (a commercially available) programmer.
> 
> DaveB
> 
> 
> >>> address@hidden 03 July 2002 11:31:57 >>>
> "Francisco T. A. Silva" <address@hidden> wrote:
> 
> > After that the id bytes became 0xff,0xff,0xff and it allways fail
> > verify!
> 
> It's a well-known problem that it can sometimes happen to destroy the
> ID bytes in serial programming.  Atmel acknowledges this in appnote
> 910, page 5:
> 
> ``Table 5 indicates that the Device Code will sometimes read as $FF.
> If this happens, the part Device Code has not been programmed into the
> device.  This does not indicate an error, but the part has to be
> manually identified in the programmer.''
> 
> (Is it even possible now in UISP to manually define the part?  Last
> time i looked it wasn't.)
> 
> I've also seen it to respond with 3 * $00 on one part.  In all cases
> however, the device still worked.
> 
> Maybe you've killed it somehow else?
> -- 
> J"org Wunsch                                         Unix 
> support engineer
> address@hidden        
> http://www.interface-systems.de/~j/ 
> avr-gcc-list at http://avr1.org
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