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Keyfob, Android, Accelerometer, CC2541 - Did not work from android works BTool and Device Monitor

Sanjay52975
Intellectual 465 points
Other Parts Discussed in Thread: CC2541

Tried my best but could not enable Accelerometer in Android on Keyfob  CC2541 Mini Kit

final static public UUID ACC_NOTFIY = UUID.fromString("0000ffa1-0000-1000-8000-00805f9b34fb");
final static public UUID ACC_ENABLEX = UUID.fromString("0000ffa3-0000-1000-8000-00805f9b34fb");

if(ch.getUuid().compareTo(BleDefinedUUIDs.Characteristic.ACC_NOTFIY) == 0) {
Log.i(TAG, "Characterstic:" + "ACC_NOTFIY found");
setCharacteristicNotification(ch, enable);
waitIdle(GATT_TIMEOUT);
}

if(ch.getUuid().compareTo(BleDefinedUUIDs.Characteristic.ACC_ENABLEX) == 0) {
Log.i(TAG, "Characterstic:" + "ACC_ENABLEX found");
setCharacteristicNotification(ch, enable);
waitIdle(GATT_TIMEOUT);
}

 public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic, boolean enabled) {
        mBusy = true;
        boolean success = mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);
        
        if(!success) {
        mBusy = false;
        Log.e(TAG, "Seting proper notification status for characteristic failed!");
        }
        else {
        //SChadha
        Log.i(TAG, "setNotificationForCharacteristic " +  characteristic.getUuid().toString() + " enabled: " + enabled);
        }
        waitIdle(GATT_TIMEOUT);
        
        // This is also sometimes required (e.g. for heart rate monitors) to enable notifications/indications
        // see: https://developer.bluetooth.org/gatt/descriptors/Pages/DescriptorViewer.aspx?u=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml
        BluetoothGattDescriptor descriptor1 = characteristic.getDescriptor(UUID.fromString("00002902-0000-1000-8000-00805f9b34fb"));
        if(descriptor1 != null) {
        mBusy = true;
        Log.i(TAG, "setNotificationForCharacteristic" +  characteristic.getUuid().toString() + " descriptor 2902  found");
        byte[] val = enabled ? BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE : BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE;
       descriptor1.setValue(val);
       mBluetoothGatt.writeDescriptor(descriptor1);
        }
        else {
        Log.i(TAG, "setNotificationForCharacteristic" +  characteristic.getUuid().toString() + " descriptor 2902 not found");
            }
        }
  }
  • 0
    Intellectual 465 points

    Anybody can you please look at the code and let me know what I may be doing incorrect:

    I am not able to turn Accelerometer on CC2541 keyfob using Android. I appreciate your help:

    private static final UUID ACCEL_SERVICE_UUID = UUID.fromString("0000FFA0-0000-1000-8000-00805f9b34fb");
	    private static final UUID ACCEL_ENABLE_UUID  =  UUID.fromString("0000FFA1-0000-1000-8000-00805f9b34fb");
	    private static final UUID X_ENABLE_UUID      =  UUID.fromString("0000FFA3-0000-1000-8000-00805f9b34fb");
	    private static final UUID X_ENABLE_UUID_DESC      =  UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");
	    
	    public void EnableAccel(boolean enable) {

	    	BluetoothGattService keyService = mBluetoothGatt.getService(ACCEL_SERVICE_UUID);
	    	if(keyService == null) {
		    	Log.d(TAG, "Acceleration service not found!");
		    	return;
	    	}

	    	BluetoothGattCharacteristic enableAcceleration = keyService.getCharacteristic(ACCEL_ENABLE_UUID);
	    	if(enableAcceleration == null) {
		    	Log.d(TAG, "Acceleration Enable charateristic not found!");
		    	return;
	    	}
	    	setCharacteristicNotification(enableAcceleration, enable);

	    	BluetoothGattCharacteristic enableX = keyService.getCharacteristic(X_ENABLE_UUID);
	    	if(enableX == null) {
		    	Log.e(TAG, "Enable X charateristic not found!");
	    	} else {	
		    	BluetoothGattDescriptor gatDesc = enableX.getDescriptor(X_ENABLE_UUID_DESC);
		    	if(gatDesc == null) {
			    	Log.e(TAG, "Enable X BluetoothGattDescriptor not found!");
			    	return;
		    	}
		    	
		    	setDescriptorNotification(gatDesc, enable);
	    	}
	    	
	    }

        public void setDescriptorNotification(BluetoothGattDescriptor descriptor, boolean enabled)
    {
    	Log.i(TAG, "setDescriptorNotification " +  descriptor.getUuid().toString());
    	byte[] val = enabled ? BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE : BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE;
        descriptor.setValue(val);
        mBluetoothGatt.writeDescriptor(descriptor);
    }