Hard erase and programming port

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hello,

i have looking through google , saw several answer related "erase button" subject, didn't find answer corresponding question.

just little context:
i have "arduino due" connected laptop (a basic ubuntu 12.04) on "programming port", arduino ide 1.5.2.
when want send sketch on arduino's microcontroller, need before upload press on "erase button". if didn't press on it, error message appears saying "no device found on ttyacm0" (my arduino rightly connected on ttyacm0...).
if press on erase button , upload, there no problem ; sketch correctly upload on arduino.

so question is: need press erase button before uploading sketch everytime ?
i thought ide (software erase) ; seems not.

regards,

laurent.

the onboard atmega16u2 supposed "press" erase button using fet across switch.

you "arduino due", means it's not official board, maybe yours doesn't have feature, or maybe broken.

______
rob


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