MPU6050 - FIFO Overflow

[Nicklars]

Hi,

 

I am using NodeMCU and MPU6050 to record Accelerometer Data and send it to my PC.

 

My Code is working fine but after about 30 seconds I get FIFO Overflow very often and then the programm crashes, I just can't figure out why.

 

Here is my Code:

    // if programming failed, don't try to do anything
    if (!dmpReady) return;

    // wait for MPU interrupt or extra packet(s) available
    while (!mpuInterrupt && fifoCount < packetSize) {
        // other program behavior stuff here
        // .
        // .
        // .
        // if you are really paranoid you can frequently test in between other
        // stuff to see if mpuInterrupt is true, and if so, "break;" from the
        // while() loop to immediately process the MPU data
        // .
        // .
        // .
    }

    // reset interrupt flag and get INT_STATUS byte
    mpuInterrupt = false;
    mpuIntStatus = mpu.getIntStatus();

    // get current FIFO count
    fifoCount = mpu.getFIFOCount();

    // check for overflow (this should never happen unless our code is too inefficient)
    if ((mpuIntStatus & 0x10) || fifoCount == 1024) {
        // reset so we can continue cleanly
        mpu.resetFIFO();
        Serial.println(F("FIFO overflow!"));

    // otherwise, check for DMP data ready interrupt (this should happen frequently)
    } else if (mpuIntStatus & 0x02) {
        // wait for correct available data length, should be a VERY short wait
        while (fifoCount < packetSize) fifoCount = mpu.getFIFOCount();

        // read a packet from FIFO
        mpu.getFIFOBytes(fifoBuffer, packetSize);
        
        // track FIFO count here in case there is > 1 packet available
        // (this lets us immediately read more without waiting for an interrupt)
        fifoCount -= packetSize;

        mpu.dmpGetAccel(&aa, fifoBuffer);
        tmp = String(aa.x) + " " + String(aa.y) + " " + String(aa.z) + " ";
        mpu.dmpGetAccel(&aa, fifoBuffer);
        gravityX = aa.x / 8192.0;
        gravityY = aa.y / 8192.0;
        gravityZ = aa.z / 8192.0;
        tmp = tmp + String(gravityX) + " " + String(gravityY) + " " + String(gravityZ) + " ";

        // display Euler angles in degrees
        mpu.dmpGetQuaternion(&q, fifoBuffer);
        mpu.dmpGetGravity(&gravity, &q);
        mpu.dmpGetYawPitchRoll(ypr, &q, &gravity);
        tmp = tmp + String(ypr[0] * 180/M_PI) + " " + String(ypr[1] * 180/M_PI) + " " + String(ypr[2] * 180/M_PI) + " ";

        mpu.dmpGetLinearAccel(&aaReal, &aa, &gravity);
        tmp = tmp + String(aaReal.x) + " " + String(aaReal.y) + " " + String(aaReal.z) + "\r\n";


        Serial.print(tmp);
        client.print(tmp);  

I know the Overflow has got something to do with the "client.print(tmp)" but I just can't figure out how to get this to work properly.

 

Hope someone can help me, thanks,

Niklas

[Nicklars]

Ok, after doing what is described here (http://www.i2cdevlib.com/forums/topic/27-fifo-overflow/#entry99) the programm works way better, but still after about 2 minutes the program crashes, output looks like this:

FIFO overflow!
-6504 2399 4043 -102.56 -54.17 17.34 139 -42 -84
FIFO overflow!
-6506 2389 4040 -102.56 -54.16 17.35 135 -54 -87
FIFO overflow!
-6496 2389 4053 -102.54 -54.17 17.34 145 -52 -75
...

Also, I the code shows a FIFO overflow right at the beginning of the code and I dont know why.