ESP8266 UART

概述

UART0: U0TXD, U0RXD, MTDO(U0RTS), MTCK(U0CTS)

UART1: GPIO2(U1TXD)

Downloading: U0TXD+U0RXD or GPIO2+U0RXD

Communicating: UART0: U0TXD, U0RXD, MTDO(U0RTS), MTCK(U0CTS)

Debugging: UART1_TXD (GPIO2) can be used to print debugging information.

By default, UART0 will output some printed information when the device is powered on and is booting up. If this issue exerts influence on some specific applications, users can exchange the inner pins of UART when initializing, that is to say, exchange U0TXD, U0RXD with U0RTS, U0CTS