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Topic: usb cdc IN packet NAK question  (Read 502 times) previous topic - next topic

dzdzz

I wrote a usb serial program on nuvoton  microcontroller, imitate uno, and use the uno's inf file.
Everything ok with the serial debugging assistant.
When arduino monitor read and write this serial, found that the host send OUT token packet is normal, and all the host sends IN packet is NAK.
I.e. monitor can send data, but can not receive data.
Descriptors have  completely compatible with uno.
some suggestion????? :smiley-confuse:

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