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Topic: Why the programming USB port can not upload program into the ATSAM3X8E? (Read 34 times) previous topic - next topic


Hi, I followed the schematic of Arduino Due and made an DIY mainboard based on the ATSAM3X8E and ATMEGA16U2.

Currently, the Native USB port of my mainboard works well. But the Programming USB port does not work. I can write the firmware to the ATMEGA16U2 by using an Arduino UNO as ISP programmer. The Arduino development software also can detect and recognize this programming USB port. However, when I upload the program using this port, the Arduino development software says "NO Device on COM xx".

I really can not understand why this happen? The schematic of my design is the same as Arduino Due.

Could anyone give me some suggestions?

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