en:arduino:libraries:softwareserialavailable
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| + | ====== SoftwareSerial: available() ====== | ||
| + | |||
| + | ===== Description ===== | ||
| + | |||
| + | 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. | ||
| + | ===== Syntax ===== | ||
| + | |||
| + | mySerial.available() | ||
| + | ===== Parameters ===== | ||
| + | |||
| + | none | ||
| + | ===== Returns ===== | ||
| + | |||
| + | the number of bytes available to read | ||
| + | ===== Example ===== | ||
| + | <code cpp> | ||
| + | // include the SoftwareSerial library so you can use its functions: | ||
| + | #include <SoftwareSerial.h> | ||
| + | |||
| + | #define rxPin 2 | ||
| + | #define txPin 3 | ||
| + | |||
| + | // 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(); | ||
| + | } | ||
| + | } | ||
| + | </code> | ||
| + | ===== See also ===== | ||
| + | |||
| + | * SoftwareSerial() | ||
| + | * read() | ||
| + | * print() | ||
| + | * println() | ||
| + | |||
| + | [[en:arduino:libraries|Reference Home]] | ||
en/arduino/libraries/softwareserialavailable.txt · 最后更改: 2016/12/25 22:15 (外部编辑)
