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Add compatibility to arduino DUE #59

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NitrofMtl
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Add Macro to be compatible to arduino DUE:

-using USART instead of hardwareSerial
-using UARTClass::UARTModes instead of uint16_t for config parameter
-changing SERIAL_PORT_HARDWARE to SERIAL_PORT_HARDWARE_DEFAULT to avoid redefinition

Also, while testing, I found that a null byte was added when transmitter was switching from transmit to receive.
The problem seem to be related to timing and setting the transmitter to 8 Serial clock fix it.

RS485.setDelays(50, (1000000/BAUDRATE*8));

Future test: try to add RS485 mode of the SAM3X8E

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CLAassistant commented Jun 16, 2025 •
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@per1234 per1234 added type: enhancement Proposed improvement topic: code Related to content of the project itself labels Jun 16, 2025
@per1234 per1234 linked an issue Jun 16, 2025 that may be closed by this pull request
Failure of compiling Arduino Due #4
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Memory usage change @ 1c241d4

Board flash % RAM for global variables %
arduino:mbed_portenta:envie_m7 N/A N/A N/A N/A
arduino:samd:mkr1000 0 - 0 0.0 - 0.0 0 - 0 0.0 - 0.0
arduino:samd:mkrfox1200 0 - 0 0.0 - 0.0 0 - 0 0.0 - 0.0
arduino:samd:mkrgsm1400 0 - 0 0.0 - 0.0 0 - 0 0.0 - 0.0
arduino:samd:mkrnb1500 0 - 0 0.0 - 0.0 0 - 0 0.0 - 0.0
arduino:samd:mkrvidor4000 0 - 0 0.0 - 0.0 0 - 0 0.0 - 0.0
arduino:samd:mkrwan1300 0 - 0 0.0 - 0.0 0 - 0 0.0 - 0.0
arduino:samd:mkrwan1310 0 - 0 0.0 - 0.0 0 - 0 0.0 - 0.0
arduino:samd:mkrwifi1010 0 - 0 0.0 - 0.0 0 - 0 0.0 - 0.0
arduino:samd:mkrzero 0 - 0 0.0 - 0.0 0 - 0 0.0 - 0.0
arduino:mbed_opta:opta 0 - 0 0.0 - 0.0 0 - 0 0.0 - 0.0
Click for full report table
Board examples/RS485Passthrough
flash		 % examples/RS485Passthrough
RAM for global variables		 % examples/RS485Receiver
flash		 % examples/RS485Receiver
RAM for global variables		 % examples/RS485Sender
flash		 % examples/RS485Sender
RAM for global variables		 %
arduino:mbed_portenta:envie_m7 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A
arduino:samd:mkr1000 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrfox1200 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrgsm1400 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrnb1500 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrvidor4000 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrwan1300 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrwan1310 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrwifi1010 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrzero 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:mbed_opta:opta 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
Click for full report CSV 
Board,examples/RS485Passthrough<br>flash,%,examples/RS485Passthrough<br>RAM for global variables,%,examples/RS485Receiver<br>flash,%,examples/RS485Receiver<br>RAM for global variables,%,examples/RS485Sender<br>flash,%,examples/RS485Sender<br>RAM for global variables,%
arduino:mbed_portenta:envie_m7,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A,N/A
arduino:samd:mkr1000,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrfox1200,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrgsm1400,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrnb1500,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrvidor4000,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrwan1300,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrwan1310,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrwifi1010,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrzero,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:mbed_opta:opta,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0

@NitrofMtl
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UPDATE: RS485 mode did not hold on, but new improvement for those how want to: I made an DMA RS485 library for DUE, and test it with a modified version of Arduino modbus library.

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Failure of compiling Arduino Due
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@NitrofMtl @CLAassistant @per1234