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1  Using Arduino / Installation & Troubleshooting / Re: Arduino MEGA2560, "verification error, first mismatch at byte [...]" on: June 21, 2013, 12:20:52 pm
Hello everybody

Any solution to this? I have the same problem here too: A RANDOM number of cheksum errors (mostly 5 - 7) at random locations. Same problem on two Arduino Mega 2560 boards. Verifing via MK2 programmer in Atmel studio shows no mismatches (i tried this several times). I also tried several cables an different USB ports as well as erasing the chip an programming a new bootloader, but the problem persists. The message I got from the last upload:

avrdude: stk500v2_recv(): checksum error
avrdude: stk500v2_recv(): checksum error
avrdude: stk500v2_recv(): checksum error
avrdude: stk500v2_recv(): checksum error
avrdude: verification error, first mismatch at byte 0x1d6e
         0xe9 != 0x0f
avrdude: verification error; content mismatch

But the programm on the arduino board woks perfectly! Sketch size is around 16 kBytes -this might give a clue as the simple blink demo uploads without any errors. Uploading Uno & Leonardo board also works flawless.

Any ideas how this can be solved?

Kind regards,
Genki
 
2  Products / Arduino Due / Re: DAC support on: November 12, 2012, 03:22:12 pm
...what would also make sense resolution-wise: LSB seems to be 0.5mV (measured) which is in line with wibauxl's theory ((2.75-0.55)/4096=0.537mV). This DAC behaviour -and te lack of it's documentation- is a little odd to my opinion, but at least there's an explanation that makes sense.

MANY THANKS FOR ALL YOUR INPUTS!!

andy_g
3  Products / Arduino Due / Re: DAC support on: November 10, 2012, 07:05:51 pm
"Hello, when i test the DAC on the DUE i measured an Outputvoltage from 0,55V (value 0) to 2,77V (value 255). I thought the DAC has a range from 0V to 3,3V?! Do anybody knows more or can help me?"

Hi all!
I would be interested in this too. Could not figure out yet why DAC range ist approx. 0,54V - 2.74V (both channels).
andy_G
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