What is "inverted serial mode"? A quick Google search only returns results for inverted text. Do you mean inverted mark/space polarity? Like RS-232 but at TTL voltage levels?The UART and USART hardware in the Due is extremely capable. I'm sure that just setting the right options will allow standard code to send&receive inverted serial. The INVDATA bit in the mode register probably does what you want.The standard Arduino Due serial code is probably not a good example to follow. There are some significant problems, although the open-source community is working on it.
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