嵌入式 - Arduino的串口操作

使用SoftwareSerial Library，可以在digital pin上进行串行通讯。可同时定义多个软件串口，多个串口的话最高速度115200bps。

要使用这个库，需要包含头文件：

#include <SoftwareSerial.h>

这个库的局限：

1，不能同时收发数据

2，定义了多个串口的话，同一时间只能一个串口接收数据。

3，On Arduino or Genuino 101 boards the current maximum RX speed is 57600bps.

定义多个串口对象实例，同一时间只能激活一个。

可用方法

1，创建对象

SoftwareSerial(rxPin, txPin, inverse_logic);

Parameters
rxPin: the pin on which to receive serial data.
txPin: the pin on which to transmit serial data.
inverse_logic: used to invert the sense of incoming bits (the default is normal logic). If set, SoftwareSerial treats a LOW (0v on the pin, normally) on the RX pin as a 1-bit (the idle state) and a HIGH (5V on the pin, normally) as a 0-bit. It also affects the way that it writes to the TX pi