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I just needed to replace String with char.


Up to six Serial Communication Interfaces (SERCOM), each configurable to operate as either: USART with full-duplex and single-wire half-duplex configuration I2C up to 3.4 MHz SPI LIN slave It is an error in the overview of the SAM D21 features in the datasheet. The SERCOM is half-duplex for I2C. USART can't be configured half-duplex. see ...


You can connect via: UART I2C SPI All are available on the Pi's GPIO header and on the Arduino. You will of course need logic level translation for a 5V Arduino. Using UART is probably simplest for you since that is identical to using the USB - you just use /dev/ttyS0 (or /dev/ttyAMA0 on older Raspberries) instead of /dev/ttyUSB0 or /dev/ttyACM0. Just ...

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