Comments on: Testing AVR universal bootloader on Atmega128

By: Torrmor

Torrmor — Wed, 18 May 2011 15:14:25 +0000

Thank you for the wonderful explanation. I tried using this Bootloader in my ATMega32. I am using 11.0592MHz External crystal. Also I am using 2K BootSector so my BootSector start address is 0×3800 Hence I have set the Fuses as CKOPT, BOOTSZ1, BOOTSZ0 and BOOTRST programmed. Rest all other fuses unprogrammed.
I have downloaded the bootloader using ponyprog. Later I downloaded my Application HEX using AVRUBD and it is successful and after giving RESET the Application is running. But if I give a PowerOFF and then ON, the application is not running. When I examined the Flash content I found that after PowerOFF and ON the first sector of Flash (0×0000 till 0x007F) has been overwritten to 0xFF. In summary the application is loaded successfully the first time without PowerON Reset, and it fails after a power cycle. Could you please let me know if I am making any mistake, also please suggest me some idea to solve this issue.
Thank you
Torrmor

By: noname

noname — Thu, 08 Jul 2010 11:46:34 +0000

Bug hint:
1-Byte checksum mode is buggy. Receive function expects 2 bytes regardless of checksum mode. Can be fixed easily.

By: hamid

hamid — Fri, 29 Jan 2010 14:09:34 +0000

you said end of text “After options are set, open hex or bin file to be downloaded and press black Dn button…”

I don’t understand which hex file open, “Bootldr.hex” or “test.hex”.

when I open Bootldr.hex via avrubd.exe, update is success but test.hex is not.

By: Max

Max — Mon, 31 Aug 2009 14:21:15 +0000

Hi,
Should not the BootStart address be 1F800 since the configuration file mentions that it is a byte address?

By: jkx

jkx — Wed, 03 Oct 2007 23:01:00 +0000

A good tips, is to use your program (not the bootloader) to reset the device. This avoid the need to a push the reset button. You can do this easily with something like this (for a ATMega8)

void (*resetptr)( void ) = 0xE00; // Set up reset to bootloader

SIGNAL (SIG_UART_RECV) {
…..
if (c == ‘r’) { uart_puts(“Reset \r\n” ); resetptr(); }

…
}

By this way, you can simply press r to reset, and flash. Even better, you can patch the program on the PC to do a automatic reset this way.

Hum, I’m wondering if this bootloader can work with AVRdude ? (avrdude -p m8 -c avr910)

Bye bye