SoftwareSerial: available()

[SoftwareSerial]

描述

Get the number of bytes (characters) available for reading from a software serial port. This is data that’s already arrived and stored in the serial receive buffer.

語法

// set up a new serial port
SoftwareSerial mySerial =  SoftwareSerial(rxPin, txPin);

mySerial.available()

參數

回傳

the number of bytes available to read

範例

// include the SoftwareSerial library so you can use its functions:
#include <SoftwareSerial.h>
 
#define rxPin 10
#define txPin 11
 
// set up a new serial port
SoftwareSerial mySerial =  SoftwareSerial(rxPin, txPin);
 
void setup()  {
  // define pin modes for tx, rx:
  pinMode(rxPin, INPUT);
  pinMode(txPin, OUTPUT);
  // set the data rate for the SoftwareSerial port
  mySerial.begin(9600);
}
 
void loop() {
  if (mySerial.available()>0) {
    mySerial.read();
  }
}

參考


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86Duino 參考的文本是根據 Creative Commons Attribution-ShareAlike 3.0 License,部分文本是從 the Arduino reference 修改的。 參考中的代碼示例已發佈到公共領域。

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