Android发送蓝牙消息接收空间字符

时间:2015-02-01 01:52:20

标签: java android bluetooth arduino android-bluetooth

我正在使用Android 4.4.4的2013 Nexus 7和带有HC-06蓝牙装置的Arduino Mega 2560进行通信。我建立了从Nexus 7到HC-06的连接,并从Arduino获得了Nexus的gotton数据,但我无法将数据从Nexus 7传输到Arduino。我在Android中传输数据时没有出错,但Arduino收到的是空格而不是我发送的字符。

Android写法:

public void write(String message) {
        Log.d(TAG, "...Data to send: " + message + "...");
        byte[] msgBuffer = message.getBytes();
        try {
            mmOutStream.write(msgBuffer);
        } catch (IOException e) {
            Log.e(TAG, "...Error data send: " + e.getMessage() + "...");
        }
    }

发送数据:

public static void sendInfo(String info) {
    boolean isErr = false;
    if (MainActivity.isConnected) {
        Log.d(TAG, "In sentInfo()");
        //Log.d(TAG, "...Data to send: " + info + "...");
        //TO(done)DO: send info to bluetooth device (Arduino)


        try {
            mConnectedThread.write(info);
        } catch (NullPointerException n) {
            isErr = true;
            Log.e("Error", "Failed to send message \"" + Arrays.toString(msg) + "\" with error \"" + n.getMessage() + ".\"");
        }

        if (!isErr) {
            Log.i("sentInfo", "In sentInfo(), this was sent: " + Arrays.toString(msg));
            //noinspection ALL
            isErr = false;
        }
    } else {
        Toast.makeText(MainActivity.mThis, "Please connect the Arduino", Toast.LENGTH_SHORT).show();
    }
}

Arduino收到代码:

int setMsg() {
   if (Serial1.available() > 0) {
      chars = Serial1.available();
      incomingByte = Serial1.read();
      putstring("You've Got Mail!  Characters: ");
      Serial.print(chars);
      putstring("  Message: '");
      Serial.print(incomingByte);
      putstring_nl("'.");
      if        (incomingByte == 49) {
         return 1;
         flashLED(500);
         Serial.println(msg);
      } else if (incomingByte == 50) {
         return 2;
         flashLED(500);
         Serial.println(msg);
     } else if (incomingByte == 51) {
         return 3;
         flashLED(500);
         Serial.println(msg);
      } else if (incomingByte == 52) {
         return 4;
         flashLED(500);
         Serial.println(msg);
      } else if (incomingByte == 53) {
         return 5;
         flashLED(500);
         Serial.println(msg);
      } else if (incomingByte == 100) {
         return 6;
         flashLED(500);
         Serial.println(msg);
      } else {
         Serial.println(incomingByte);
         digitalWrite(ledPin, HIGH);
         delay(3250);
         digitalWrite(ledPin, LOW);
         delay(20);
         return 0;
      }
   }
}

请解释为什么Arduino Serial始终打印 You've Got Mail! Characters: 1 Message: ' '.当Nexus 7向HC-06发送任何消息(我只将引号中的数字发送到sendInfo()功能)时。{/ p>

1 个答案:

答案 0 :(得分:0)

  • 您将incomingByte改为int的类型是什么?

根据您的评论进行修改:

incomingByte needs to be an int

将您的阅读代码更改为:

Arduino Mega example:

void setup() {
  Serial.begin(9600);
  Serial1.begin(9600);

}

void loop() {
  // read from port 0, send to port 1:
  if (Serial.available()) {
    int inByte = Serial.read();
    Serial1.print(inByte, BYTE); 

  }
  // read from port 1, send to port 0:
  if (Serial1.available()) {
    int inByte = Serial1.read();
    Serial.print(inByte, BYTE); 
  }
}
  

(我只将引号中的数字发送到sendInfo()函数)到HC-06。

你不应该在引号中发送数字,只是一个数字。这可能是你的问题,因为它正在读取引号。

  • 此外,使用开关代替所有ifs可能更好

  • byte[] msg = info.getBytes();中的sendInfo(String info) {是不必要的行,您从我看到的内容中未使用它,您将字符串解析为{{1}中的字节数组}}

而不是write(string) method 你可以Log.i("sentInfo", "In sentInfo(), this was sent: " + Arrays.toString(msg));

以及你在返回之后拥有的所有东西,如果,将不会被执行

Log.i("sentInfo", "In sentInfo(), this was sent: " + info);

要在每个if语句中执行的任何内容都需要在return语句之前放入,返回将导致函数完成并返回到调用函数。