ATmega32U4 supported as a RS485 Master/Slave about dcs-bios-arduino-library HOT 9 OPEN

Correct, that fall through is intentional. That particular message is only a warning, so it shouldn't be an issue, but I've corrected it now.
As for the master version: I'll look into it. Theoretically, it should be possible, but I'm learning this codebase on the fly.

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Note that I have tried this with VSCode+PlatformIO and Arduino 1.8.6 both give same errors

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If you're comfortable with it, please try giving the "32U4_Support" branch of my fork a try. If that works I will submit the pull request for this repo. You will also need to add a #define UART1_SELECT to your script and remove the #define DCS_BIOS_DEFAULT_SERIAL when you are using RS485. I don't have the hardware to test this out on a live RS485 network, but it does appear to compile correctly now.
For reference: the root of this issue appears to be that the 32U4 indexes its UART port off of 1 instead of zero. UART0 does not exist, UART1 does. I don't have a deep enough understanding of the RS485 code to comment on any further effects that this might have outside of RS485, but my current implementation essentially just tells BIOS to pretend that it is an ATmega2560 instead of a 32U4 for the purposes of communication. @talbotmcinnis may have a clearer knowledge of what that portion of the code is actually doing.

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Happy to try.
It did compile the slave code see attcahed for one message in it

C:\Users\smgvb\Documents\Arduino\libraries\dcs-bios-arduino-library-32U4_Support\src/internal/DcsBiosNgRS485Slave.cpp.inc: In member function 'void DcsBios::RS485Slave::rxISR()':
C:\Users\smgvb\Documents\Arduino\libraries\dcs-bios-arduino-library-32U4_Support\src/internal/DcsBiosNgRS485Slave.cpp.inc:79:12: warning: this statement may fall through [-Wimplicit-fallthrough=]
      state = RX_WAIT_ADDRESS;
      ~~~~~~^~~~~~~~~~~~~~~~~
C:\Users\smgvb\Documents\Arduino\libraries\dcs-bios-arduino-library-32U4_Support\src/internal/DcsBiosNgRS485Slave.cpp.inc:83:4: note: here
    case RX_WAIT_ADDRESS:
    ^~~~

log.txt

It does not compile the RS485 Master code though for me (not sure if you address master or not)
here's the log from that compile.

RS485Master_log.txt

I really appreciate your help on this

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I looked at the code around that point and it seems to be expected to fall thru, refering to this

C:\Users\smgvb\Documents\Arduino\libraries\dcs-bios-arduino-library-32U4_Support\src/internal/DcsBiosNgRS485Slave.cpp.inc:79:12: warning: this statement may fall through [-Wimplicit-fallthrough=]
      state = RX_WAIT_ADDRESS;

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Been awhile on this issue so checking in to see if there's been any progress on this?

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Kind of gave up on this ask, I've gotten it compiling now on the Pro-Micro in both Master/Slave modes, really does come down to the 32U4 has no UART0 that's reserved for the CDC USB port, so UART1 is the first UART available. my current code is still untested and have to check the UART BAUD settings. I'll eventually do a PR once fully tested for it to incorporate if desired.

oh and also believe I got IRQ working, also to be tested

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@kbastronomics Did you ever get this working?

I made the mistake of buying ATMEGA32U4 Pro Micro's instead of Nano's, and rather than let them go to waste I'm hoping you've solved this issue.

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Partially, Slave seems to be working. master is a little more work.

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