Arduino库教程-Software Serial-Two Port Receive
Two Port Receive
Arduino和genuino板内置的引脚0和1支持串口通信,但是如果你需要更多的串行端口怎么办?SoftwareSerial 库已经发展到允许串行通信发生在你开发板的其他数字引脚上,用软件复制硬件RX和TX线的功能。这可能是非常有用的,尤其是需要与两个串行功能的设备进行通信,或只和一个设备,但要让主要的串行端口开放来调试。
在下面的例子中,你的Arduino或genuino板的数字引脚pin2和4作为虚拟的RX和TX串行线使用。引脚3和5是虚拟的TX线。开发板倾听一个虚拟端口(portOne),知道它接受到一个"?"字符。之后,它会倾听第二虚拟端口(portTwo)。
硬件要求
- Arduino or Genuino Board
电路
- 这个例子没有额外电路。确保你的Arduino或genuino开发板通过USB是能串口通讯连接到电脑。
图由 Fritzing 软件绘制
原理图
图由 Fritzing 软件绘制
样例代码
/*
Software serial multple serial test
Receives from the two software serial ports,
sends to the hardware serial port.
In order to listen on a software port, you call port.listen().
When using two software serial ports, you have to switch ports
by listen()ing on each one in turn. Pick a logical time to switch
ports, like the end of an expected transmission, or when the
buffer is empty. This example switches ports when there is nothing
more to read from a port
The circuit:
Two devices which communicate serially are needed.
* First serial device's TX attached to digital pin 10(RX), RX to pin 11(TX)
* Second serial device's TX attached to digital pin 8(RX), RX to pin 9(TX)
Note:
Not all pins on the Mega and Mega 2560 support change interrupts,
so only the following can be used for RX:
10, 11, 12, 13, 50, 51, 52, 53, 62, 63, 64, 65, 66, 67, 68, 69
Not all pins on the Leonardo support change interrupts,
so only the following can be used for RX:
8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI).
created 18 Apr. 2011
modified 19 March 2016
by Tom Igoe
based on Mikal Hart's twoPortRXExample
This example code is in the public domain.
*/
#include <SoftwareSerial.h>
// software serial #1: RX = digital pin 10, TX = digital pin 11
SoftwareSerial portOne(10, 11);
// software serial #2: RX = digital pin 8, TX = digital pin 9
// on the Mega, use other pins instead, since 8 and 9 don't work on the Mega
SoftwareSerial portTwo(8, 9);
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
// Start each software serial port
portOne.begin(9600);
portTwo.begin(9600);
}
void loop() {
// By default, the last intialized port is listening.
// when you want to listen on a port, explicitly select it:
portOne.listen();
Serial.println("Data from port one:");
// while there is data coming in, read it
// and send to the hardware serial port:
while (portOne.available() > 0) {
char inByte = portOne.read();
Serial.write(inByte);
}
// blank line to separate data from the two ports:
Serial.println();
// Now listen on the second port
portTwo.listen();
// while there is data coming in, read it
// and send to the hardware serial port:
Serial.println("Data from port two:");
while (portTwo.available() > 0) {
char inByte = portTwo.read();
Serial.write(inByte);
}
// blank line to separate data from the two ports:
Serial.println();
}
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更多
- The Software Serial Library
- SoftwareSerialExample - 两个串行端口,在镜像的TX和RX之间发送数据。
- MultiSerialMega - 使用在Arduino和Genuino Mega上的两个有效串行端口。
- Serial Call Response - 通过呼叫-响应(握手)方法来发送多个变量。
- Serial Call Response ASCII - 通过呼叫-响应(握手)方法来发送多个变量,并且在发送前ASCII编码这些值。
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