我正在用我的 arduino uno 测试 wifi 模块 esp8266。我使它与直接连接 RX/TX 和通过软件串行一起工作。
这是我的代码：
#include <SoftwareSerial.h>
SoftwareSerial esp8266(3, 2); // RX | TX
#define DEBUG true
int ERROR_PIN = 7;
int OK_PIN = 6;
char serialbuffer[400];//serial buffer for request url
const String ssid = "XXX";
const String pw = "XXX";
int state = 0;
void setup()
{
delay(1000);
/**
// init leds
pinMode(ERROR_PIN, OUTPUT);
pinMode(OK_PIN, OUTPUT);
state = 0;
digitalWrite(ERROR_PIN, HIGH);
digitalWrite(OK_PIN, LOW);
/**/
// init ports
Serial.begin(19200);
Serial.println("initializing esp8266 port...");
esp8266.begin(19200);
delay(400);
// init WIFI
/**/
while(!esp8266.available())
{
Serial.print("...");
delay(300);
}
Serial.println();
Serial.println("FINISH esp8266 initializing!");
//
/**
digitalWrite(ERROR_PIN, LOW);
digitalWrite(OK_PIN, HIGH);
state = 1;
/**/
/**/
// Setup connection
sendData("AT+RST\r\n",2000,DEBUG);
sendData("AT+CWMODE?\r\n",1000,DEBUG);
//sendData("AT+CWMODE=1\r\n",2000,DEBUG);
//sendData("AT+RST\r\n",3000,DEBUG);
//sendData("AT+CWLAP\r\n",6000,DEBUG);
sendData("AT+CWJAP=\"" + ssid + "\",\""+ pw +"\"\r\n",12000,DEBUG);
sendData("AT+CIFSR\r\n",8000,DEBUG);
sendData("AT+CIPMUX=1\r\n", 6000, DEBUG);
webRequest("");
/**/
/**/
}
void loop()
{
if (esp8266.available())
{
char c = esp8266.read() ;
Serial.print(c);
/**
if(state == 0)
{
state = 1;
digitalWrite(ERROR_PIN, LOW);
digitalWrite(OK_PIN, HIGH);
}
/**/
}
else
{
/**
if(state > 0)
{
state = 0;
digitalWrite(ERROR_PIN, HIGH);
digitalWrite(OK_PIN, LOW);
}
/**/
}
if (Serial.available())
{
char c = Serial.read();
esp8266.print(c);
}
}
//////////////////////////////////////////////////////////////////////////////
String sendData(String command, const int timeout, boolean debug)
{
String response = "";
esp8266.print(command); // send the read character to the esp8266
long int time = millis();
while( (time+timeout) > millis())
{
while(esp8266.available())
{
// The esp has data so display its output to the serial window
char c = esp8266.read(); // read the next character.
response+=c;
}
}
if(debug)
{
Serial.print(response);
}
return response;
}
//////////////////////////////////////////////////////////////////////////////////
String webRequest(String url)
{
String response = "";
url = "www.google.es";
//String tmpCommand = "AT+CIPSTART=4," + "\"TCP\",\"" + url + "\",80";
String tmpSTARTCommmand = "AT+CIPSTART=0,\"TCP\",\"retro.hackaday.com\",80\r\n\r\n";
String tmpGETCommand = "GET / HTTP/1.1\r\nHost: ";
tmpGETCommand += "retro.hackaday.com";
tmpGETCommand += ":80\r\n\r\n";
String tmpSENDCommand = "AT+CIPSEND=0," + String(tmpGETCommand.length()) + "\r\n";
sendData(tmpSTARTCommmand, 8000, DEBUG);
sendData(tmpSENDCommand, 8000, DEBUG);
sendData(tmpGETCommand, 15000, DEBUG);
}
这一直有效，直到我执行 webrequest。我收到一个错误的请求响应。
initializing esp8266 port...
.........
FINISH esp8266 initializing!
BâÂúØÐPÊþ^X8Â�Ä^Âú[8ÐûÈâ·CâËØè[8Ð{Èâ·GâÃØRÈ蚉5˜‰0
bÕ
ready
AT+CWMODE?
+CWMODE:3
OK
AV®)AB•«Ë—mX·et","XXX"
OK
AT+CIFSR
+CIFSR:APIP,"192.168.4.1"
+CIFSR:APMAC,"1a:fe:34:9b:c3:83"
+CIFSR:STAIP,"192.168.1.89"
+CIFSR:STAMAC,"18:fe:34:9b:c3:83"
OK
AT+CIPMUX=1
OK
AV%AMEÕÕ*$‘²troÐ…�‘½µ‰,80
0,CONNECT
OK
AVCIPSEND=0,47
> GE@/!QQAŠrŠ%åõÑ: ÊÑɽB�……¹½µÂ‚%\n\r\nbusy s...
SEND OK
+IPD,0,323:HTTP/1.1 400 Bad Request
Server: nginx/1.6.2
Date: Sat, 04 Apr 2015 16:17:29 GMT
Content-Type: text/html
Content-Length: 172
Connection: close
<html>
<head><title>400 Bad Request</title></head>
<body bgcolor="white">
<center><h1>400 Bad Request</h1></center>
<hr><center>nginx/1.6.2</center>
</body>
</html>
OK
"qXÑzÂC!É1âø‚h[•�™cü ÐQ!}Ñfócú I]Ø÷ÃBj 1¤(ÑÃÖa”K!~CóbÕ
ready
任何想法？