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stanley_seow: SAMD21 pinout
©
stanley_seow: SERCOM0_USART_0
©
stanley_seow: SERCOM1_SPI_0
©
stanley_seow: SERCOM4_USART_1
©
stanley_seow: SERCOM on SAMD21
©
stanley_seow: SERCOM#_I2C_0