Dynoplex works serial

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The processor, hardware design, and programming environment are already set, and I cannot change the hardware or processor at all, so a software solution is required.

The included Arduino libraries provide a SoftwareSerial library which I have discovered is only half duplex - during the send routine, interrupts are disabled, which of course means that the interrupt driven receive routine is shut down.

Before I implement my own full-duplex library, I wanted to find out if others have found a simple solution for this, or if there are libraries out there that implement it correctly.

Which approach is best on a given platform will depend upon what types of bit-munging operations it can perform most efficiently. I would offer a few suggestions, though:. Note that while the worst-case time may be significant, the normal-case time will be quite fast. Further, when an incoming byte is detected, one could copy it to another word of memory and do the bit-munging on a later interrupt. Since serial-transmit will only need to do something every third interrupt, the bit-munging could be done on interrupts where the serial-transmit routine doesn't run.

You say that you can't change existing hardware - can you add? If both serial lines will not need to be active at the same time then you could use a multiplexer or analog switch on the UART lines and switch back and forth between the two devices needing to be served. It has an SPI interface and is very easy to use.

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