1、Arduino esp8266-串口的常用函數(shù)常用函數(shù)1.Serial.begin(speed)打開串口參數(shù):speed ：波特率2.Serial.available()獲取串口上可讀取的數(shù)據(jù)的字節(jié)數(shù)。該數(shù)據(jù)是指已經(jīng)到達(dá)并存儲(chǔ)在接收緩存（共有64字節(jié)）中。available()繼承自Stream實(shí)用類。語法：Serial.available()參數(shù)：無返回值：返回可讀取的字節(jié)數(shù)示例：int incomingByte = 0; / for incoming serial datavoid setup() Serial.begin(9600); / opens serial port, sets

2、data rate to 9600 bpsvoid loop() / send data only when you receive data:if (Serial.available() 0) / read the incoming byte:incomingByte = Serial.read();/ say what you got:Serial.print(I received: );Serial.println(incomingByte, DEC);3.Serial.read()讀串口數(shù)據(jù)，read()繼承自Stream實(shí)用類。 語法：Serial.read()參數(shù)：無返回值：串口上

3、第一個(gè)可讀取的字節(jié)（如果沒有可讀取的數(shù)據(jù)則返回-1）- int型。示例：int incomingByte = 0; / 用于存儲(chǔ)從串口讀到的數(shù)據(jù)void setup() Serial.begin(9600); / 打開串呂，設(shè)置速率為9600 bpsvoid loop() / 只在收到數(shù)據(jù)時(shí)發(fā)送數(shù)據(jù) if (Serial.available() 0) / 讀取傳入的字節(jié) incomingByte = Serial.read(); / 指示你收到的數(shù)據(jù) Serial.print(I received: ); Serial.println(incomingByte, DEC); 4.Serial.

4、flush（）刷新串口數(shù)據(jù)，等待串口數(shù)據(jù)完成輸出。5.Serial.print()往串口發(fā)數(shù)據(jù)，無換行 描述以人類可讀的ASCII碼形式向串口發(fā)送數(shù)據(jù)，該函數(shù)有多種格式。整數(shù)的每一數(shù)位將以ASCII碼形式發(fā)送。浮點(diǎn)數(shù)同樣以ASCII碼形式發(fā)送，默認(rèn)保留小數(shù)點(diǎn)后兩位。字節(jié)型數(shù)據(jù)將以單個(gè)字符形式發(fā)送。字符和字符串會(huì)以其相應(yīng)的形式發(fā)送。例如：Serial.print(78) 發(fā)送 78Serial.print(1.23456) 發(fā)送 1.23Serial.print(N) 發(fā)送 NSerial.print(Hello world.) 發(fā)送 Hello world.可選的第二個(gè)參數(shù)用于指定數(shù)據(jù)的格式。

5、允許的值為：BIN (binary二進(jìn)制), OCT (octal八進(jìn)制), DEC (decimal十進(jìn)制), HEX (hexadecimal十六進(jìn)制)。對(duì)于浮點(diǎn)數(shù)，該參數(shù)指定小數(shù)點(diǎn)的位數(shù)。例如：Serial.print(78, BIN) gives 1001110Serial.print(78, OCT) gives 116Serial.print(78, DEC) gives 78Serial.print(78, HEX) gives 4ESerial.println(1.23456, 0) gives 1Serial.println(1.23456, 2) gives 1.23Ser

6、ial.println(1.23456, 4) gives 1.2346你可以用F()把待發(fā)送的字符串包裝到flash存儲(chǔ)器。例如：Serial.print(F(“Hello World”)要發(fā)送單個(gè)字節(jié)數(shù)據(jù)，請(qǐng)使用Serial.write()。添加 F() 相當(dāng)于為字符串常量定義了PROGMEM屬性，常量字符串仍然存儲(chǔ)在FLASH中，但是程序運(yùn)行時(shí)不會(huì)再將常量字符串從FLASH中copy到SRAM中，而是直接讀取FLASH中的字符串，這樣一來就節(jié)約了SRAM，但是代碼運(yùn)行速度就下降了。語法：Serial.print(val)Serial.print(val, format)參數(shù)：val: 要

7、發(fā)送的數(shù)據(jù)（任何數(shù)據(jù)類型）format: 指定數(shù)字的基數(shù)（用于整型數(shù)）或者小數(shù)的位數(shù)（用于浮點(diǎn)數(shù)）。返回值：size_t (long): print()返回發(fā)送的字節(jié)數(shù)（可丟棄該返回值）。示例：/*Uses a FOR loop for data and prints a number in various formats.*/int x = 0; / variablevoid setup() Serial.begin(9600); / open the serial port at 9600 bps:void loop() / print labelsSerial.print(NO FORM

8、AT); / prints a labelSerial.print(t); / prints a tabSerial.print(DEC);Serial.print(t);Serial.print(HEX);Serial.print(t);Serial.print(OCT);Serial.print(t);Serial.print(BIN);Serial.print(t);for(x=0; x 64; x+) / only part of the ASCII chart, change to suit/ print it out in many formats:Serial.print(x);

9、 / print as an ASCII-encoded decimal - same as DECSerial.print(t); / prints a tabSerial.print(x, DEC); / print as an ASCII-encoded decimalSerial.print(t); / prints a tabSerial.print(x, HEX); / print as an ASCII-encoded hexadecimalSerial.print(t); / prints a tabSerial.print(x, OCT); / print as an ASC

10、II-encoded octalSerial.print(t); / prints a tabSerial.println(x, BIN); / print as an ASCII-encoded binary/ then adds the carriage return with printlndelay(200); / delay 200 millisecondsSerial.println(); / prints another carriage return6.Serial.println()往串口發(fā)數(shù)據(jù)，類似Serial.print()，但有換行。7.Serial.write()寫二進(jìn)制數(shù)據(jù)到串口，數(shù)據(jù)是一個(gè)字節(jié)一個(gè)字節(jié)地發(fā)送的，若以字符形式發(fā)送數(shù)字請(qǐng)使用print()代替。語法：Serial.write(val)Serial.write(str)Serial.write(buf, len)參數(shù)：val: 作為單個(gè)字節(jié)發(fā)送的數(shù)據(jù)str: 由一系列字節(jié)組成的字符串buf: 同一系列字節(jié)組成的數(shù)組len: 要發(fā)送的數(shù)組的長度返回：wri