Hi! I have a 3D printing system, and 4 arduino nanos. The problem is that I have a working code on 2 of them, 1 is broken, the other one has the bad code. I was wondering if I could transfer the code from one arduino to another, without using a programmer, only usb. I tried so many times, but I have failed, this is asking for help, not a duplicate topic. And if I could do it, how?
I personally don't know how to do it without using a Programmer connected to the ICSP header pins.
You should have one anyway if you are doing projects. $7.77 at Pololu, free shipping in the US.
You can do it with avrdude and a bootloader-using Arduino, same as using a programmer (though you can't get EEPROM off it - they couldn't fit EEPROM functionality into 512 bytes. and felt (correctly I think) that losing 512b of flash wasn't worth eeprom read/write through bootloader, especially considering the IDE basically not handling eeprom anyway.)
Well I found this download code from arduino to computer? - Project Guidance - Arduino Forum. And what about that 512b? Will I lose half of my code? I just want to transfer the program I wrote, not the whole bootloader.
CrossRoads:
I personally don't know how to do it without using a Programmer connected to the ICSP header pins.
You should have one anyway if you are doing projects. $7.77 at Pololu, free shipping in the US.
Pololu USB AVR Programmer v2.1
I think you misunderstood me. I would like to read thethe program that I wrote, and uploaded to the arduino, not the bootloader.
I would use the Programmer and Atmel Studio, I don't know how to do it with the IDE.
I haven't downloaded from a chip in ages, would need some playing around time to do it again.
I don't have the latest either.
just use AVRdude,...
something like
C:\arduino-1.8.13-portable\portable\packages\arduino\tools\avrdude\6.3.0-arduino18/bin/avrdude -CC:\arduino-1.8.13-portable\portable\packages\DxCore\hardware\megaavr\1.3.2/avrdude.conf -pm328p -carduino -PCOM22 -b115200 -Uflash:r:output.hex:i
do a dummy upload with nothing connected, and verbose output during upload enabled. first upload line is the command it invokes, copy paste that into a text document and then get rid of everything other then the -p(part) -P(port) -b(baud rate). Replace -Uflash:w:path/to/file:i with -Uflash:r:output.hex:i . Double check that you have removed the -e (erase) , open a command window where you want the hex file to be created, and paste the modified command in.
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