Hi,
I have some problems programming my leonardo.
With my UNO as ISP I burned a new bootloader and, for testing, a little blink-sketch.
When connecting via USB I see the COM-Port. When start uploading a sketch with Arduino IDE the COM-Port disappears as the board is resetted, but never apperas again.
The RX and TX LEDs are flickering parallel. ON and L are on.
What could be the problem?
That's expected behaviour. If you're using Windows (your use of the word COM-port indicates that, you should see another COM-port appearing for a couple of seconds.
Please explain; you should get the original COM-port back after the upload.
Did you burn the blink-sketch with the Arduino-as-ISP or via USB. With the former, the bootloader will be wiped unless you burned the hex-file that also contains the bootloader.
The COM-Port does not come back, so the upload does not really start.
The blink-skrecth was uploaded with Arduino-as-ISP.
I think when using Arduino IDE the hex-file should contain a bootloader?!
Two files are generated, e.g. blink.ino.hex and blink.ino.with_bootloader.hex. With normal uploads via USB, it is definitely the former, when uploading via a programmer I'm 95% sure it's also the former.
I suggest that you burn the bootloader first with the Arduino-as-ISP. After that the behaviour of the Leonardo in Windows device manager should be as below (COM ports can be different).
Normal operation
After press/release reset button or when an upload starts
Next you can upload blink via USB and the above behaviour should not change. After that you can upload again with Arduino-as-ISP and see what happens.
You're right. After burning the bootloader and NOT uploading a sketch via Arduino-as-ISP i'm able to upload sketches via USB again.
I don't know why i missed that.
Thank you!!
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