next topic »

[on:]

Hi!
I've made a board with an atmega2560. I'm trying to upload the bootloader with another arduino used as ISP and I get this error:

Code:

avrdude: verification error, first mismatch at byte 0x3e000
        0x0d != 0xff
avrdude: verification error; content mismatch

but the led on pin 13 digital blinks. So, I tried to upload a sketch and it works only the first time!  
If I try twice it fails with a timeout error.
Can somebody help me?

Thank you very much!

[Reply #1 on:]

After you load ArduinoISP, are you disabling auto-reset?   If the host Arduino resets then the bootloader will be in control, not the ArduinoISP sketch.  One easy way is to hook a 1 to 2 microfarad capacitor between Reset (+) and Ground (-) on the host Arduino after you upload ArduinoISP.

[Reply #2 on:]

Yes...I put the 110Ohm resistor as explained here http://www.arduino.cc/playground/Main/DisablingAutoResetOnSerialConnection...is it right?
Thank you

[Reply #3 on:]

Yes, the resistor should work.

I'm not entirely clear on the problem...  Did you burn a bootloader without error?

You can use the ArduinoISP to upload sketches but I think you need the bootloader to turn control over to the sketch on startup.  If the error was with burning the bootloader you should get that fixed first.

[Reply #4 on:]

No...that's the first problem...when I burn it I get the error in my first post.
I have also tried to upload a sketch via usb (with ft232) and it succeeded, but if I try to upload it again it fails.
I made few tests and I I can upload a sketch only ones after the bootloader, but I think it is a bootloader-related problem because of that error...

Thank You

[Reply #5 on:]

Sounds like a lock issue - after uploading the bootloader, the lock but should be set to 0x0F - maybe an issue with the boards.txt file. Can you post its contents here and we'll havea look at it.


Drew.

[Reply #6 on:]

I was thinking about a lock, too. But I haven't edited the original board.txt...
This is the mega2560 section:

Code:

mega2560.name=Arduino Mega 2560

mega2560.upload.protocol=stk500v2
mega2560.upload.maximum_size=258048
mega2560.upload.speed=115200

mega2560.bootloader.low_fuses=0xFF
mega2560.bootloader.high_fuses=0xD8
mega2560.bootloader.extended_fuses=0xFD
mega2560.bootloader.path=stk500v2
mega2560.bootloader.file=stk500boot_v2_mega2560.hex
mega2560.bootloader.unlock_bits=0x3F
mega2560.bootloader.lock_bits=0x0F

mega2560.build.mcu=atmega2560
mega2560.build.f_cpu=16000000L
mega2560.build.core=arduino

Thank You

[Reply #7 on:]

Looks OK ! - Does the sketch you are trying to upload contain !!! in it? - That is the debug switch code to access the extended menu on the 2560 bootloader.

Drew

[Reply #8 on:]

How long are the wires between Arduino ISP and the target (atmega2560)?

[Reply #9 on:]

No "!!!"...I just tried with the blink example...
The wires are long about 70cm...mmh..is it too much?

Thank You

[Reply #10 on:]

The wires are long about 70cm...mmh..is it too much?

I've never used anything longer than about 20cm so I can't say for certain if 70cm is or is not a problem.  I can say that 20cm has been a good choice for me.

At this point, you nothing to lose...  Try shorter wires.  Carefully check all connections.

[Reply #11 on:]

Less than 10cm, but nothing change 

[Reply #12 on:]

what operating system and version of ide are you using?

[Reply #13 on:]

Mac Os X 10.6.6 and arduino IDE 0022...
I also tried with 0020 with the same result...

Should I try on windows?

Thank you

[Reply #14 on:]

There has been issues with the drivers on mac, try this :

1) Go to System Preferences -> Network
2) If it asks you to add the Arduino (modem device), say cancel
3) Remove the Arduino device from the list if its there
4) Try uploading a sketch!

I only have windows xp - so can't comment if this realy works.

Drew