forked from espressif/arduino-esp32
Summary This PR fixes an issue with UART1 default pins. When using pins RX_1 = 18 and TX_1 = 17, UART1 will display a Break Error on those pins when they are floting (not connected). It also defines RX_2 = 19 and TX_2 = 20 as default pins for UART2. Impact The deaulf pins may look different from the original pinout diagram.