> I've bought and tossed a couple of USB to serial thingies. Last one I
> bought
> was a China special but the packaging said it used the FTDI
> chipset/driver.
> Works perfectly with XP.
>
> There's a ASM language bootloader which is only 512Bytes - source in
> public
> domain. Works on mega8 and bigger. Here's the header from the main file
> ;***********************************************
> ;* This is a modified version of design note #032 'DN032' From
> http://www.avrfreaks.com
> ;* It is meant specifically for atmega-8 and avrprog.exe 1.37 or better.
> ;* The original DN did not seem to work properly with a atmega8, after
> some
> debugging it
> ;* appeard that the problem was that the code did not re-enable RWW access
> after page write or erase. Fixed.
> ;* Notes:
> ;* Added an esc char test at the beginning of the code. Modify as
> necessary.
> ;* I left in the eeprom program counter.
> ;* Be sure to use avrprog.exe 1.37 or a version that supports atmega8 (the
> regular download from atmel is 1.33)
> ;* While debugging I also discovered that avrprog support a baud rate of
> 115200, seems to work okay.
> ;* Fuses: BLB11 BOOTSZ1 BOOTRST
> ;* comments or questions? carlott@si.rr.com
> http://users.rcn.com/carlott/
>
> ;********** B O O T L O A D E R **********
> ;* File : bootloader_m8.asm (Include chip erase counter)
> ;* Compiler : AVR Studio
> ;* Target : mega8
>
>
> -----Original Message-----
> From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
> Of Gustavo Goretkin
> Sent: Saturday, July 09, 2005 5:34 PM
> To: AVR-Chat@yahoogroups.com
> Subject: [AVR-Chat] Bootloader troubles
>
> Hello, I have an STK500 board, and i need to do some UART stuff on my
> computer with it, I only have 1 serial port on my "recent" mobo, and it
> is a pain to have to switch between the ports, and I've tried an "AB"
> switch, but still I would rather try something new. I bought a $10 USB
> to RS232 converter on eBay and it doesn't work. *sigh*, its a cypress
> chip, and well apparently it doesn't work.
> So I am looking into using a boot loader program, BTW this is on a
> MEGA16 chip. So the first boot loader I looked into is the one available
> at this website: http://hubbard.engr.scu.edu/embedded/avr/bootloader/ .
> When I found this, I thought it was great, it emulates the STK500 so I
> won't even have to leave the AVR studio IDE. So I program my chip with
> it, I'm using the right clock, connect the UART to the spare one on the
> STK500 board, and I open the programmer in AVR studio, and it detects
> the "board" it says it has an old firmware installed, but I don't
> install it because I doubt the boot loader will do anything with it. I
> load a hex file of a program I made, and it generates an error when
> trying to go into "Programming" mode. I give up on it after a couple of
> hours of looking on line for any solution and continue on my search for
> a boot loader.
> I come up against one written in IAR C, using information from this site
> : http://projects.gbdt.com.au/boot162/ and it is the boot loader that
> Atmel themselves wrote, its one of there aplication notes, and it
> emulates the "AVR PROG" protocol. I download the trial of IAR C, and I
> can't even get the thing to compile (I am not very good at C, at all), i
> twiddle with some of the compiler settings (CPU target, clock speed so
> forth) and I only generate more errors. Still not giving up, I search
> again for a boot loader.
> This time its Megaload, which I found on a search in www.avrfreaks.net .
> http://www.microsyl.com/megaload/megaload.html . I download the trial of
> ImageCraft C compiler, and I am able to compile the code this time, I
> have all the defines correct, and compiler settings correct (I hope). I
> program the HEX file to the MEGA16 and then connect the UART again. I
> run MEGALOAD, load the HEX file to program through the boot loader, and
> press the reset button on the board. Megaload detects (sometimes it
> detects other crazy crap) an Atmega16, with 16k of flash, 512 k of
> eeprome and so forth, and it tries to load the hex file. and on the
> window the left I get a never ending scrolling list of
>
> Programming Page File #0
> Programming Failed
> Programming Page File #0
> Programming Failed
> Programming Page File #0
> Programming Failed
> ....
>
> And light that anyone could shine for me would be greatly, imensly
> appreciated. Thank you in advance
> Gustavo
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
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