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Arduino - 乱码串行输出

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我已经将ADH8066(Sparkfun)GSM模块连接到我的Arduino Uno,并试图在Arduino和GSM模块之间获得一些正确的串行 . 当我直接(通过USB或只是TTL线)连接它时它工作正常,但是当通过Arduino控制时却没有 . 一些文本将正确输出,其余文本将出现乱码,几乎就像波特率错误一样,但我只是使用与从PC连接时相同的波特率(115200) .

这是我正在使用的Arduino代码:

#include <SoftwareSerial.h>

#define rxPin 7
#define txPin 8
SoftwareSerial mySerial = SoftwareSerial(rxPin, txPin);

// EN: String buffer for the GPRS shield message
String SmsStorePos = String("");
String msg = String("");
String snTmp = String("");
String snFull = String("");

// EN: Set to 1 when the next GPRS shield message will contains the SMS message
int SmsContentFlag = 0;

// EN: Pin of the LED to turn ON and OFF depending on the received message
int ledPin = 5;
int powerPin = 6;

void setup()
{
  mySerial.begin(115200);               // the GPRS baud rate   
  mySerial.print("\r");
  delay(1000);
  Serial.begin(115200);                 // the Arduino IDE serial
  Serial.println("Started!");

  pinMode( ledPin, OUTPUT ); 
  digitalWrite( ledPin, LOW ); 

  pinMode( powerPin, OUTPUT);
  digitalWrite(powerPin, LOW);    // brings ONKEY low to turn on the modem (aka pressing the ONKEY)
  delay(3000);
  digitalWrite(powerPin, HIGH);    // sets the pin HIGH again (restore 5V)
  delay(5000);

  // test LED pin
  digitalWrite ( ledPin, HIGH);
  delay(1000);
  digitalWrite( ledPin, LOW); 
}

void loop()
{
    char SerialInByte;

    // Send anything we receive from the IDE to the modem
    if(Serial.available())
    {
       mySerial.print((unsigned char)Serial.read());
     }  
    else  if(mySerial.available())
    {
        char SerialInByte;
        SerialInByte = (unsigned char)mySerial.read();
        //SerialInByte = mySerial.read();

        // EN: Relay to Arduino IDE Monitor
        Serial.print( SerialInByte );

        // -------------------------------------------------------------------
        // EN: Program also listen to the GPRS shield message.
        // -------------------------------------------------------------------

        // EN: If the message ends with <CR> then process the message
        if( SerialInByte == 13 ){
          // EN: Store the char into the message buffer
          ProcessGprsMsg();
         }
         if( SerialInByte == 10 ){
            // EN: Skip Line feed
         }
         else {
           // EN: store the current character in the message string buffer
           msg += String(SerialInByte);
         }
     }   
}

// EN: Make action based on the content of the SMS. 
//     Notice than SMS content is the result of the processing of several GPRS shield messages.
void ProcessSms( String sms ){
  sms.toLowerCase();
  Serial.print( "ProcessSms for [" );
  Serial.print( sms );
  Serial.println( "]" );

  if( sms.indexOf("on") >= 0 ){
    digitalWrite( ledPin, HIGH );
    Serial.println( "LED IS ON" );
    return;
  }
  if( sms.indexOf("off") >= 0 ){
    digitalWrite( ledPin, LOW );
    Serial.println( "LED IS OFF" );
    return;
  } else {
    mySerial.print("AT+CMGF=1\r");    //Because we want to send the SMS in text mode
    delay(1000);
    mySerial.print("AT+CMGS=\"");
    mySerial.print(snFull);
    mySerial.print("\"\r");
    delay(1000);
    mySerial.print("Unknown Command: ");
    mySerial.print(sms);
    mySerial.print("\r");
    delay(1000);
    mySerial.write(0x1A);  //Equivalent to sending Ctrl+Z     
    return;
  }
}
// EN: Request Text Mode for SMS messaging
void GprsTextModeSMS(){
  mySerial.println( "AT+CMGF=1" );
}

void GprsReadSmsStore( String SmsStorePos ){
  // Serial.print( "GprsReadSmsStore for storePos " );
  // Serial.println( SmsStorePos ); 
  mySerial.print( "AT+CMGR=" );
  mySerial.println( SmsStorePos );
}

// EN: Clear the GPRS shield message buffer
void ClearGprsMsg(){
  msg = "";
}

// EN: interpret the GPRS shield message and act appropiately
void ProcessGprsMsg() {
  Serial.println("");
  Serial.print( "GPRS Message: [" );
  Serial.print( msg );
  Serial.println( "]" );

  if( msg.indexOf( "Call Ready" ) >= 0 ){
     Serial.println( "*** GPRS Shield registered on Mobile Network ***" );
     GprsTextModeSMS();
  }

  // EN: unsolicited message received when getting a SMS message
  if( msg.indexOf( "+CMTI" ) >= 0 ){
     Serial.println( "*** SMS Received ***" );
     // EN: Look for the coma in the full message (+CMTI: "SM",6)
     //     In the sample, the SMS is stored at position 6
     int iPos = msg.indexOf( "," );
     SmsStorePos = msg.substring( iPos+1 );
     Serial.print( "SMS stored at " );
     Serial.println( SmsStorePos );

     // EN: Ask to read the SMS store
     GprsReadSmsStore( SmsStorePos );
  }

  // EN: SMS store read via UART (result of GprsReadSmsStore request)  
  if( msg.indexOf( "+CMGR:" ) >= 0 ){
    // get number of sender
    int snPos = msg.indexOf("+1");
    Serial.print("SMS From: ");
    snTmp = msg.substring(snPos+1);
    snFull = "";
    for (int i = 0; i < 11; i++){
      snFull += snTmp[i];    
    }
    Serial.println(snFull);

    // EN: Next message will contains the BODY of SMS
    SmsContentFlag = 1;
    // EN: Following lines are essentiel to not clear the flag!
    ClearGprsMsg();
    return;
  }

  // EN: +CMGR message just before indicate that the following GRPS Shield message 
  //     (this message) will contains the SMS body
  if( SmsContentFlag == 1 ){
    Serial.println( "*** SMS MESSAGE CONTENT ***" );
    Serial.println( msg );
    Serial.println( "*** END OF SMS MESSAGE ***" );
    ProcessSms( msg );
    delSMS();
  }

  ClearGprsMsg();
  // EN: Always clear the flag
  SmsContentFlag = 0; 
}
void delSMS() {
  mySerial.print("AT+CMGD=");
  mySerial.println(SmsStorePos);
}

以下是我在串行监视器中看到的内容:

http://imgur.com/i5jEPds

7 回答

  • 1

    众所周知,SoftwareSerial在时间上很挑剔,并且会导致像你描述的同时出现“太多”的问题 . 由于你正在做其他事情,它可能会失去同步 .

    我热烈推荐AltSoftSerial(http://www.pjrc.com/teensy/td_libs_AltSoftSerial.html),它的性能要好得多,但我仍然建议你使用略低的波特率来提高可靠性 . 太高的波特率需要非常精确的时序才能不丢失单个位,并且硬件功能不足以在软件中进行串行流量而不会出现问题 .

  • 7

    确保“波特”设置与草图匹配 .

    例如:Serial.begin(115200); >>>> 115200波特率在控制台中 .

    我从kunalbhat上面的评论中得到了这个解决方案 . 但我想把它作为一个独立的答案发布,因为它解决了我的问题,而且我从来没有想过 . 所以我认为它会帮助很多其他人 .

  • 7

    如前所述,问题在于“波特”设置(与串行通信有关 - 另一个答案) . 这可以(通常)在草图的顶部找到,可能如下所示:

    Serial.begin(9600);
    

    或这个:

    Serial.begin(115200);
    

    在Arduino Uno的情况下,9600以外的“波特”设置将导致文本乱码 . 因此,请确保在草图的开头有一行:

    Serial.begin(9600);
    

    如果您需要任何进一步的帮助,请随时询问 .

  • 0

    我使用Arduino编程ATtiny84但输出乱码或串行在第一行后停止,直到我重置Arduino .

    问题是Arduino加载了'Arduino as ISP'草图,干扰了来自ATtiny84的串行数据 .

    上传空白草图到Arduino修复它 .

  • 0

    原因是,您需要设置命令AT UART_DEF = 9600,8,1,0,0以将ESP的波特率重置为9600,或者您也可以使用AT CIOBAUD = 9600!
    尝试一下,它对我有用!
    我曾经在一些ESP-01和ESP-12模块上尝试了 AT+IPR ,有时候它正在工作,有时候没有(在非常糟糕的情况下,完全改变了波特率)!

  • 1

    我不得不将“波特”设置更改为9600 .

    Serial.begin(9600);
    
  • 1

    我不得不回到我的mega上的硬件序列来让它工作 . 从来没有好运与sw连载

    硬件串口sim900到mega:// sim900上的中间rx / tx引脚到mega上的引脚tx1 / rx1

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