AVR-Chat

I have seem to found the problem with the RS-232 to USB, and that is the 
level shifter is actually powered by the devices Tx line.

I still have had no success with the boot loader, should I just write my 
own? Is it difficult?

stevech wrote:

> Assembler2 - - I thought it was standard in the latter version of AVR
> Studio.
>
> USB to RS232 - having bought and tosses a few of these, for reasons you
> cite, the one I have now works quite well.  It's a China no-name but uses
> the FTDI chipset.  You can end it all by buying a 4 or 8 port USB to 
> serial
> box on eBay, really cheap, made by Edgeport. Super reliable. See item
> 5788134094 on eBay
>
>
> -----Original Message-----
> From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
> Of Gustavo Goretkin
> Sent: Monday, July 11, 2005 8:24 PM
> To: AVR-Chat@yahoogroups.com
> Subject: Re: [AVR-Chat] Bootloader troubles E2END
>
> Hmm, I don't have that directory, I have AVR studio 4, the most recent I
> believe, and the help file mentions Avr Assembler 2. Anyways, I assume
> that is the end of the Eeprom  memory for the device since the Mega 8
> has 512k , like the Mega 16.
> I assembled the code, and I tried the boot loader, and if didn't work
> :(. It didn't even recognize the device.
>
> Anyways, I found the problem with the USB to RS232 converter, and the
> actual level translator is powered from the TX line of the  serial port,
> and apparently the STK500's MAX232 isnt supplying enough power, im
> getting + and - 6 volts on its TX line, any suggestions please?
>
> Thank you
>
> stevech wrote:
>
> > I found E2END in this directory and file:
> > C:\Program Files\Atmel\AVR Tools\AvrAssembler2\Appnotes\m8def.inc
> > It is NOT in this file
> > C:\Program Files\Atmel\AVR Tools\AvrAssembler\Appnotes
> >
> > Note the "2" in the pathname for the former, not the latter.
> > Go figure.
> >
> > Steve
> > ===========
> >
> > Mega8 chip...
> >
> >                  ; ***** DATA MEMORY DECLARATIONS
> > *****************************************
> >                  .equ      FLASHEND      = 0x0fff      ; Note: Word
> > address
> >                  .equ      IOEND      = 0x003f
> >                  .equ      SRAM_START      = 0x0060
> >                  .equ      SRAM_SIZE      = 1024
> >                  .equ      RAMEND      = 0x045f
> >                  .equ      XRAMEND      = 0x0000
> >                  .equ      E2END      = 0x01ff
> >                  .equ      EEPROMEND      = 0x01ff
> >                  .equ      EEADRBITS      = 9
> >                  #pragma AVRPART MEMORY PROG_FLASH 8192
> >                  #pragma AVRPART MEMORY EEPROM 512
> >                  #pragma AVRPART MEMORY INT_SRAM SIZE 1024
> >                  #pragma AVRPART MEMORY INT_SRAM START_ADDR 0x60
> >
> > ======================================================================
> > '
> >
> >
> > -----Original Message-----
> > From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On 
> Behalf
> > Of Kathy Quinlan
> > Sent: Sunday, July 10, 2005 7:47 AM
> > To: AVR-Chat@yahoogroups.com
> > Subject: Re: [AVR-Chat] Bootloader troubles
> >
> > Gustavo Goretkin wrote:
> > > Thank you for your reply. I'm trying to assemble the code, but im
> > > experiencing some trouble,
> > >         ldi     R26,low(E2END-1)         ; increment Chip Erase 
> Counter
> > > located at address E2END-1
> > >         ldi     R27,high(E2END-1)         ;
> > >
> > > I don't quite understant what E2END is, and where it is supposed to be
> > > defined/ equated
> > > thanks again
> > >
> > > stevech wrote:
> >
> >
> > I would hazard a guess that  E2END is value equivalent to the last
> > location of the EEPROM. I am not sure if this is an Atmel define or a
> > complier one.
> >
> > Regards,
> >
> > Kat.
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >
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