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[Fwd: Re: [avr-chat] Patching USBasp and AVRdude]

From: Robert L Cochran
Subject: [Fwd: Re: [avr-chat] Patching USBasp and AVRdude]
Date: Sun, 02 Nov 2008 13:16:12 -0500
User-agent: Thunderbird (X11/20080501)

I can't comment on whether your breadboard programmer circuit is correct
because I'm a beginning breadboard user without a lot of expertise. And
I'm a beginner with AVRs too.

My perception is -- you are not providing a schematic for it and it is
difficult for me to identify the devices from the picture. Your
breadboard needs a larger footprint than a small PCB and physically
bumping the breadboard could change the circuit or cause it to
malfunction when a component comes loose or detaches itself from the

Others in this forum are far more expert than I so listen to them first...


smcx wrote:
> Well, that might be a problem. But in ponyprog, I always perform a write
> without an erase cycle, and I never get a verification error. Nevertheless,
> I'll try to make the programmer again and try by tomorrow. By the way, I was
> using the programmer constructed on a breadboard. Is it necessary to
> construct the circuit on PCB? (Here is a 
> http://3.bp.blogspot.com/_83WgROTnvFo/SQXziI7buYI/AAAAAAAAAM4/U2FwTh4AOiQ/s1600-h/DSC00993.JPG
> picture  of my programmer.
> Peter-35 wrote:
>> smcx schrieb:
>>> And here is the output from AVRdude (I was using AVR8-Burn-O-Mat as a
>>> GUI)
>>> C:\WinAVR-20071221\bin\avrdude.exe -q -u -C
>>> C:\WinAVR-20071221\bin\avrdude.conf -p m8 -P usb -c usbasp -D -E
>>> noreset,novcc  -U flash:w:E:\Labsoft\ATMEGA8\main.hex:a
>> The -D option your frontend passes to avrdude is the main Problem here I 
>> think. It disables the erase-cycle avrdude normally performs before 
>> writing to the avr. When the old program is only overwritten with the 
>> new one, it is no wonder that the verification fails.
>> regards,
>> Peter
>> _______________________________________________
>> AVR-chat mailing list
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