If it will help… I recently put a
bootloader in a Mega8 using Atmel ISP.
I have a collection of many bootloaders,
most in C.
Enclosed is the one I most recently used –
public domain.
It is smaller than any of the C ones I
have.
It works with Atmel’s AVRProg
utility. I have to invoke that from a DOS prompt; maybe it can be done from an
IDE, not sure.
Kind of tricky to use the bootloader:
reset the micro then hit CR on the AVRprog DOS command within a half second or so.
Edit the asm file to change the crystal –
I have it set to 10.0MHz. And 19.2KBaud.
Install it with the Atmel ISP – set the
fuses, bootloader start address = 000f00 (word address) == 001E00 (byte addr)
Cheers.
From:
address@hidden
[mailto:address@hidden On Behalf Of Mattew Fornero
Sent: Saturday, April 01, 2006
3:51 PM
To: address@hidden
Subject: [avr-gcc-list] AVR109-GCC
bootloader problem on mega8
I'm attempting to setup a
bootloader for the ATmega8 using the avr109 app note posted here. I'm using the
GCC version included in it, along with the WinAVR toolchain.
Using the preprocessor.xls file, I've setup my bootloader to have 1024 words of
memory, starting at address 0xc00. The chip runs off the interal RC oscillator
at 8MHz, with a baud rate of 19200. I've changed the partcode from 0x77 to 0x76
in order for AVRDUDE to correctly detect it.
I've also modified the bootloader to write the OSCAL register at startup to the
calibration value found using the stk500 tool in AVRStudio 4
AVRDUDE is then able to communicate with the bootloader via the UART, correctly
reads the fuses, signature bytes, etc.
It appears to erase/write memory
correctly, but the process fails when performing verify at the end of a .hex
download.
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avrdude: verification error, first mismatch at byte
0x0000
0x12 != 0xff
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When I use either the stk500 or the bootloader to read flash memory out to a
file, I see all Fs (unprogrammed) until the bootloader section, which contains
the correct hex data for my code. It seems that the bootloader is correctly
interfacing to AVRDUDE, correctly reading flash memory, but is not writing it
correctly.
I've checked the fuse and lock bit settings-- each appear to be correct:
Fuses: H = 0xD8 (bootsize = 1024, boot reset vector enabled)
L = 0xE4 (clk = 8mhz interal osc, startup = 6ck + 64ms)
Lock bits = 0xFF (no mem lock, no app section protection, no boot section
protection)
I've also tried adding the following command to the main loop of the
bootloader:
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else if(val =='Z')
{
temp_int = 0xabcd;
address = 0;
_WAIT_FOR_SPM();
_PAGE_ERASE( address );
_WAIT_FOR_SPM();
_FILL_TEMP_WORD( address,
temp_int);
_WAIT_FOR_SPM();
_PAGE_WRITE( address
<< 1 );
_WAIT_FOR_SPM();
_ENABLE_RWW_SECTION();
sendchar('!');
sendchar('\r');
}
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Using a terminal program, I've sent the "Z" command and gotten the
expected "!" and line feed, but see no change to the contents of memory
when reading it back out.
Anyone know what might be going wrong here?
(AVRDUDE log file):
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C:\WinAVR\bin\avrdude -p atmega8 -P com2 -c avr109 -v -v -U
flash:w:main.hex
avrdude: Version 5.0
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
System wide configuration file is
"C:\WinAVR\bin\avrdude.conf"
Using Port
: com2
Using Programmer :
avr109
AVR Part
: ATMEGA8
Chip Erase delay :
10000 us
PAGEL
: PD7
BS2
: PC2
RESET disposition :
dedicated
RETRY pulse
: SCK
serial program mode : yes
parallel program mode : yes
Timeout
: 200
StabDelay
: 100
CmdexeDelay
: 25
SyncLoops
: 32
ByteDelay
: 0
PollIndex
: 3
PollValue
: 0x53
Memory Detail
:
Block Poll
Page
Polled
Memory Type Mode Delay Size
Indx Paged Size Size #Pages MinW MaxW
ReadBack
----------- ---- ----- ----- ----
------ ------ ---- ------ ----- ----- ---------
eeprom
4 10 128 0 no
512 0 0 9000 9000 0xff
0xff
flash
33 6 64 0 yes
8192 64 128 4500 4500 0xff 0x00
lfuse
0 0 0 0 no
1 0 0
2000 2000 0x00 0x00
hfuse
0 0 0 0 no
1 0 0
2000 2000 0x00 0x00
lock
0 0 0 0 no
1 0 0
2000 2000 0x00 0x00
calibration 0
0 0 0 no
4 0 0
0 0 0x00 0x00
signature
0 0 0 0 no
3 0 0
0 0 0x00 0x00
Programmer Type : avr910
Description : Atmel
AppNote AVR109 Boot Loader
Connecting to programmer: .
Found programmer: Id = "AVRBOOT"; type = S
Software Version = 1.5; No Hardware Version given.
Programmer supports auto addr increment.
Programmer supports buffered memory access with buffersize=64 bytes.
Programmer supports the following devices:
Device code: 0x76
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.00s
avrdude: Device signature = 0x1e9307
avrdude: NOTE: FLASH memory has been specified, an erase cycle will be
performed
To disable this feature, specify the -D
option.
avrdude: erasing chip
avrdude: reading input file "main.hex"
avrdude: input file main.hex auto detected as Motorola S-Record
avrdude: writing flash (2138 bytes):
Writing | ################################################## | 100% 1.28s
avrdude: 2138 bytes of flash written
avrdude: verifying flash memory against main.hex:
avrdude: load data flash data from input file main.hex:
avrdude: input file main.hex auto detected as Motorola S-Record
avrdude: input file main.hex contains 2138 bytes
avrdude: reading on-chip flash data:
Reading | ################################################## | 100% 1.17s
avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x0000
0x12 != 0xff
avrdude: verification error; content mismatch
avrdude done. Thank you.
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--
Matthew Fornero
address@hidden
(734)-846-4968
AVR Bootloader Mega8.zip