[Feature Request] UNO R4: Support for CAN TXD/RXD pin remapping

[srolf]

Please provide an alternative method for remapping the TXD/RXD pins during initialization of the CAN interface (different from defaults) if this is possible by hardware.

Use case: By adding e.g. the Arduino Ethernet Shield Rev2, its SD-card reader SPI chip select would collide with CAN TXD/RXD without being able to assign different pins. This would as example allow a usage as CAN<->ETH gateway.

[facchinm]

Hi @srolf, you can already assign different pins using the constructor method arduino::R7FA4M1_CAN myCAN(int const can_tx_pin, int const can_rx_pin); and then using myCAN object in place of CAN in the code.
However, on RA4M1, the possibie muxes are only P102/P103 and P109/P110 , so the alternative mux interferes with SPI functionality on both UNO R4 WiFi and Minima