UART

pin 17 / 18 = SD2 / SD3 = UART1 pin 27 / 28 = IO 26 / 27 = UART2

Serial

  • U0 = RXD0 / TXD0
  • U1 = SD2 / SD3 (can not use)
  • U2 = U2RXD = IO16, U2TXD = IO17

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