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Hi
I am writing an embedded application for Infineon XMC4500 microprocessor. I read data from different sensors and I send this data by means of bluetooth module in order to visualize them on the screen of Android smarphone. I use GraphView library.
I implemented BluetoothClass according to Android tutorial. If I get data from single sensor then everything is ok. But when I get data from multiple sensors unfortunately my application does not work smoothly.
Of course I am doing Bluetooth connection in seperate thread and I try to update UI in Handler. Tell me please what am I doing wrong. Of course I send data by means of JSON exchange format:
I send something like this from the microcontroller side:
sprintf(json_data, "{"
"\"m\":"
"["
"{"
"\"id\":a,"
"\"x\":%.2f,"
"\"y\":%.2f,"
"\"z\":%.2f"
"},"
"{"
"\"id\":g,"
"\"x\":%.2f,"
"\"y\":%.2f,"
"\"z\":%.2f"
"},"
"{"
"\"id\":m,"
"\"x\":%.2f,"
"\"y\":%.2f,"
"\"z\":%.2f"
"},"
"{"
"\"id\":t,"
"\"x\":%.2f"
"},"
"{"
"\"id\":h,"
"\"x\":%.2f"
"}"
"]"
"}", getAccelXf(), getAccelYf(), getAccelZf(), getGyroXf(), getGyroYf(), getGyroZf(), getMagnetXf(), getMagnetYf(), getMagnetZf(), readTemperature(), readHumidity());
As an attachment to my request I add pieces of source code:
public class ConnectedThread extends Thread
{
BluetoothSocket connectedSocket;
InputStream inStream;
OutputStream outStream;
public ConnectedThread(BluetoothSocket socket)
{
connectedSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
try
{
if (connectedSocket != null)
{
tmpIn = connectedSocket.getInputStream();
tmpOut = connectedSocket.getOutputStream();
mHandler.obtainMessage(Constants.MESSAGE_DEVICE_CONNECTED_SUCCESSFULLY).sendToTarget();
// Toast.makeText(activityContext, "connectedSocket != null", Toast.LENGTH_LONG);
}
}
catch (IOException e) {
mHandler.obtainMessage(Constants.MESSAGE_INPUT_OUTPUT_STREAM_UNAVAILABLE).sendToTarget();
e.printStackTrace();
}
inStream = tmpIn;
outStream = tmpOut;
}
public void run()
{
if(bluetoothAdapter.isDiscovering()){
bluetoothAdapter.cancelDiscovery();
}
byte[] buffer = new byte[4096];
int bytes;
String dupa;
while (true)
{
try {
if (inStream != null)
{
bytes = inStream.available();
if(bytes > 0 && bytes <= 200)
{
byte[] pocketBytes = new byte[bytes];
inStream.read(pocketBytes);
//Log.d(TAG, "setState() " + mState + " -> " + state);
System.out.println(pocketBytes.toString());
dupa = pocketBytes.toString();
System.out.println(dupa);
mHandler.obtainMessage(MESSAGE_READ, bytes, -1, pocketBytes).sendToTarget();
}
}
} catch (IOException e) {
mHandler.obtainMessage(Constants.MESSAGE_REMOTE_DEV_DISCONNECTED).sendToTarget();
break;
}
/*try
{
Thread.sleep(250);
} catch (InterruptedException e) {
e.printStackTrace();
}*/
}
}
/* Call this from the main activity to send data to the remote device */
public void write(byte[] bytes) {
try {
outStream.write(bytes);
} catch (IOException e) { }
}
/* Call this from the main activity to shutdown the connection */
public void cancel() {
try {
connectedSocket.close();
} catch (IOException e) { }
}
}
}
And after that I try to update UI in the Handler.
It does not work smoothly, morever sometimes it does not respond.
Could you please tell me what am I doing wrong azar echatrandom ?
Thx in advance.
- Labels:
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Legacy Microcontrollers
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Hi,
Is this a BLE UART module ? Could you confirm whether the data in the UART interface is proper ?
Best Regards,
Vasanth R S
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Hi @HereturbiesWalt ,
The thread was locked due to inactivity for a long time. You can continue the discussion on the topic by opening a new thread with reference to the locked one. The continuous discussion in an inactive thread may mostly be unattended by community users.
Thanks and Regards,
Nikhil