A tutorial for adding a new I2C to the SAMD21 can be found here: Creating a new Wire | Using ATSAMD21 SERCOM for more SPI, I2C and Serial ports | Adafruit Learning System.
The whole article also includes adding new SPI and Serial ports.
A tutorial for adding a new I2C to the SAMD21 can be found here: Creating a new Wire | Using ATSAMD21 SERCOM for more SPI, I2C and Serial ports | Adafruit Learning System.
The whole article also includes adding new SPI and Serial ports.