Example to use MPU6050 library. This project contains usage of DMP and way to get raw values from the sensor. I ported here from this arduino's project https://github.com/jrowberg/i2cdevlib/tree/master/Arduino/MPU6050/Examples. See here if you want try visualization of sensor values. To get move this program, we need to connect pinName 27 to "SCL" pin, pinName 28 to "SDA" pin, and pinName 29 to "INT" pin of MPU6050.

Dependencies:   mbed MPU6050

Revision:
2:42c4f3a7813f
Parent:
1:ec0a08108442
--- a/main.cpp	Sat Nov 23 16:47:59 2013 +0000
+++ b/main.cpp	Sun Jan 31 14:12:13 2016 +0000
@@ -1,343 +1,17 @@
-// I2C device class (I2Cdev) demonstration Arduino sketch for MPU6050 class using DMP (MotionApps v2.0)
-// 6/21/2012 by Jeff Rowberg <jeff@rowberg.net>
-// Updates should (hopefully) always be available at https://github.com/jrowberg/i2cdevlib
+//#include "MPU6050_DMP6.h"
 //
-// Changelog:
-//     2012-06-21 - added note about Arduino 1.0.1 + Leonardo compatibility error
-//     2012-06-20 - improved FIFO overflow handling and simplified read process
-//     2012-06-19 - completely rearranged DMP initialization code and simplification
-//     2012-06-13 - pull gyro and accel data from FIFO packet instead of reading directly
-//     2012-06-09 - fix broken FIFO read sequence and change interrupt detection to RISING
-//     2012-06-05 - add gravity-compensated initial reference frame acceleration output
-//                - add 3D math helper file to DMP6 example sketch
-//                - add Euler output and Yaw/Pitch/Roll output formats
-//     2012-06-04 - remove accel offset clearing for better results (thanks Sungon Lee)
-//     2012-06-01 - fixed gyro sensitivity to be 2000 deg/sec instead of 250
-//     2012-05-30 - basic DMP initialization working
-
-/* ============================================
-I2Cdev device library code is placed under the MIT license
-Copyright (c) 2012 Jeff Rowberg
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
-===============================================
-*/
-
-// Arduino Wire library is required if I2Cdev I2CDEV_ARDUINO_WIRE implementation
-// is used in I2Cdev.h
-//#include "Wire.h"
-
-// I2Cdev and MPU6050 must be installed as libraries, or else the .cpp/.h files
-// for both classes must be in the include path of your project
-#include "I2Cdev.h"
-
-#include "MPU6050_6Axis_MotionApps20.h"
-//#include "MPU6050.h" // not necessary if using MotionApps include file
-
-// class default I2C address is 0x68
-// specific I2C addresses may be passed as a parameter here
-// AD0 low = 0x68 (default for SparkFun breakout and InvenSense evaluation board)
-// AD0 high = 0x69
-
-MPU6050 mpu;
-
-/* =========================================================================
-   NOTE: In addition to connection 3.3v, GND, SDA, and SCL, this sketch
-   depends on the MPU-6050's INT pin being connected to the Arduino's
-   external interrupt #0 pin. On the Arduino Uno and Mega 2560, this is
-   digital I/O pin 2.
- * ========================================================================= */
-
-/* =========================================================================
-   NOTE: Arduino v1.0.1 with the Leonardo board generates a compile error
-   when using Serial.write(buf, len). The Teapot output uses this method.
-   The solution requires a modification to the Arduino USBAPI.h file, which
-   is fortunately simple, but annoying. This will be fixed in the next IDE
-   release. For more info, see these links:
+//int main() {
+//    MPU6050DMP6::setup();
+//    while(1) {
+//        MPU6050DMP6::loop();
+//    }
+//}
 
-   http://arduino.cc/forum/index.php/topic,109987.0.html
-   http://code.google.com/p/arduino/issues/detail?id=958
- * ========================================================================= */
-
-const float M_PI = 3.14159265;
-
-// uncomment "OUTPUT_READABLE_QUATERNION" if you want to see the actual
-// quaternion components in a [w, x, y, z] format (not best for parsing
-// on a remote host such as Processing or something though)
-//#define OUTPUT_READABLE_QUATERNION
-
-// uncomment "OUTPUT_READABLE_EULER" if you want to see Euler angles
-// (in degrees) calculated from the quaternions coming from the FIFO.
-// Note that Euler angles suffer from gimbal lock (for more info, see
-// http://en.wikipedia.org/wiki/Gimbal_lock)
-//#define OUTPUT_READABLE_EULER
-
-// uncomment "OUTPUT_READABLE_YAWPITCHROLL" if you want to see the yaw/
-// pitch/roll angles (in degrees) calculated from the quaternions coming
-// from the FIFO. Note this also requires gravity vector calculations.
-// Also note that yaw/pitch/roll angles suffer from gimbal lock (for
-// more info, see: http://en.wikipedia.org/wiki/Gimbal_lock)
-//#define OUTPUT_READABLE_YAWPITCHROLL
-
-// uncomment "OUTPUT_READABLE_REALACCEL" if you want to see acceleration
-// components with gravity removed. This acceleration reference frame is
-// not compensated for orientation, so +X is always +X according to the
-// sensor, just without the effects of gravity. If you want acceleration
-// compensated for orientation, us OUTPUT_READABLE_WORLDACCEL instead.
-//#define OUTPUT_READABLE_REALACCEL
-
-// uncomment "OUTPUT_READABLE_WORLDACCEL" if you want to see acceleration
-// components with gravity removed and adjusted for the world frame of
-// reference (yaw is relative to initial orientation, since no magnetometer
-// is present in this case). Could be quite handy in some cases.
-//#define OUTPUT_READABLE_WORLDACCEL
-
-// uncomment "OUTPUT_TEAPOT" if you want output that matches the
-// format used for the InvenSense teapot demo
-//#define OUTPUT_TEAPOT
-
-// MPU control/status vars
-bool dmpReady = false;  // set true if DMP init was successful
-uint8_t mpuIntStatus;   // holds actual interrupt status byte from MPU
-uint8_t devStatus;      // return status after each device operation (0 = success, !0 = error)
-uint16_t packetSize;    // expected DMP packet size (default is 42 bytes)
-uint16_t fifoCount;     // count of all bytes currently in FIFO
-uint8_t fifoBuffer[64]; // FIFO storage buffer
-
-// orientation/motion vars
-Quaternion q;           // [w, x, y, z]         quaternion container
-VectorInt16 aa;         // [x, y, z]            accel sensor measurements
-VectorInt16 aaReal;     // [x, y, z]            gravity-free accel sensor measurements
-VectorInt16 aaWorld;    // [x, y, z]            world-frame accel sensor measurements
-VectorFloat gravity;    // [x, y, z]            gravity vector
-float euler[3];         // [psi, theta, phi]    Euler angle container
-float ypr[3];           // [yaw, pitch, roll]   yaw/pitch/roll container and gravity vector
-
-// packet structure for InvenSense teapot demo
-uint8_t teapotPacket[14] = { '$', 0x02, 0,0, 0,0, 0,0, 0,0, 0x00, 0x00, '\r', '\n' };
-
-DigitalOut led1(LED1);
-InterruptIn checkpin(p29);
-Serial pc(USBTX, USBRX);
-
-// ================================================================
-// ===               INTERRUPT DETECTION ROUTINE                ===
-// ================================================================
-
-volatile bool mpuInterrupt = false;     // indicates whether MPU interrupt pin has gone high
-void dmpDataReady() {
-    mpuInterrupt = true;
-}
-
-void setup();
-void loop();
+#include "MPU6050_raw.h"
 
 int main() {
-    setup();
+    MPU6050raw::setup();
     while(1) {
-        loop();
-    }
-}
-
-// ================================================================
-// ===                      INITIAL SETUP                       ===
-// ================================================================
-
-void setup() {
-    // NOTE: 8MHz or slower host processors, like the Teensy @ 3.3v or Ardunio
-    // Pro Mini running at 3.3v, cannot handle this baud rate reliably due to
-    // the baud timing being too misaligned with processor ticks. You must use
-    // 38400 or slower in these cases, or use some kind of external separate
-    // crystal solution for the UART timer.
-
-    // initialize device
-    pc.printf("Initializing I2C devices...\r\n");
-    mpu.initialize();
-
-    // verify connection
-    pc.printf("Testing device connections...\r\n");
-    if (mpu.testConnection()) pc.printf("MPU6050 connection successful\r\n");
-    else pc.printf("MPU6050 connection failed\r\n");
-    
-    // wait for ready
-    //Serial.println(F("\nSend any character to begin DMP programming and demo: "));
-    //while (Serial.available() && Serial.read()); // empty buffer
-    //while (!Serial.available());                 // wait for data
-    //while (Serial.available() && Serial.read()); // empty buffer again
-
-    // load and configure the DMP
-    pc.printf("Initializing DMP...\r\n");
-    devStatus = mpu.dmpInitialize();
-    
-    // make sure it worked (returns 0 if so)
-    if (devStatus == 0) {
-        // turn on the DMP, now that it's ready
-        pc.printf("Enabling DMP...\r\n");
-        mpu.setDMPEnabled(true);
-
-        // enable Arduino interrupt detection
-        pc.printf("Enabling interrupt detection (Arduino external interrupt 0)...\r\n");
-        checkpin.rise(&dmpDataReady);
-        
-        mpuIntStatus = mpu.getIntStatus();
-
-        // set our DMP Ready flag so the main loop() function knows it's okay to use it
-        pc.printf("DMP ready! Waiting for first interrupt...\r\n");
-        dmpReady = true;
-
-        // get expected DMP packet size for later comparison
-        packetSize = mpu.dmpGetFIFOPacketSize();
-    } else {
-        // ERROR!
-        // 1 = initial memory load failed
-        // 2 = DMP configuration updates failed
-        // (if it's going to break, usually the code will be 1)
-        
-        pc.printf("DDMP Initialization failed (code ");
-        pc.printf("%d", devStatus);
-        pc.printf(")\r\n");
-    }
-
-}
-
-
-
-// ================================================================
-// ===                    MAIN PROGRAM LOOP                     ===
-// ================================================================
-
-void loop() {
-    // 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;
-
-        #ifdef OUTPUT_READABLE_QUATERNION
-            // display quaternion values in easy matrix form: w x y z
-            mpu.dmpGetQuaternion(&q, fifoBuffer);
-            printf("quat\t");
-            printf("%f\t", q.w);
-            printf("%f\t", q.x);
-            printf("%f\t", q.y);
-            printf("%f\t\r\n", q.z);
-        #endif
-
-        #ifdef OUTPUT_READABLE_EULER
-            // display Euler angles in degrees
-            mpu.dmpGetQuaternion(&q, fifoBuffer);
-            mpu.dmpGetEuler(euler, &q);
-            printf("euler\t");
-            printf("%f\t", euler[0] * 180/M_PI);
-            printf("%f\t", euler[1] * 180/M_PI);
-            printf("%f\t\r\n", euler[2] * 180/M_PI);
-        #endif
-
-        #ifdef OUTPUT_READABLE_YAWPITCHROLL
-            // display Euler angles in degrees
-            mpu.dmpGetQuaternion(&q, fifoBuffer);
-            mpu.dmpGetGravity(&gravity, &q);
-            mpu.dmpGetYawPitchRoll(ypr, &q, &gravity);
-            printf("ypr\t");
-            printf("%f\t", ypr[0] * 180/M_PI);
-            printf("%f\t", ypr[1] * 180/M_PI);
-            printf("%f\t\r\n", ypr[2] * 180/M_PI);
-        #endif
-
-        #ifdef OUTPUT_READABLE_REALACCEL
-            // display real acceleration, adjusted to remove gravity
-            mpu.dmpGetQuaternion(&q, fifoBuffer);
-            mpu.dmpGetAccel(&aa, fifoBuffer);
-            mpu.dmpGetGravity(&gravity, &q);
-            mpu.dmpGetLinearAccel(&aaReal, &aa, &gravity);
-            printf("areal\t");
-            printf("%f\t", aaReal.x);
-            printf("%f\t", aaReal.y);
-            printf("%f\t\r\n", aaReal.z);
-        #endif
-
-        #ifdef OUTPUT_READABLE_WORLDACCEL
-            // display initial world-frame acceleration, adjusted to remove gravity
-            // and rotated based on known orientation from quaternion
-            mpu.dmpGetQuaternion(&q, fifoBuffer);
-            mpu.dmpGetAccel(&aa, fifoBuffer);
-            mpu.dmpGetGravity(&gravity, &q);
-            mpu.dmpGetLinearAccelInWorld(&aaWorld, &aaReal, &q);
-            printf("aworld\t");
-            printf("%f\t", aaWorld.x);
-            printf("%f\t", aaWorld.y);
-            printf("%f\t\r\n", aaWorld.z);
-        #endif
-    
-        #ifdef OUTPUT_TEAPOT
-            // display quaternion values in InvenSense Teapot demo format:
-            teapotPacket[2] = fifoBuffer[0];
-            teapotPacket[3] = fifoBuffer[1];
-            teapotPacket[4] = fifoBuffer[4];
-            teapotPacket[5] = fifoBuffer[5];
-            teapotPacket[6] = fifoBuffer[8];
-            teapotPacket[7] = fifoBuffer[9];
-            teapotPacket[8] = fifoBuffer[12];
-            teapotPacket[9] = fifoBuffer[13];
-            for (int i = 0; i < 14; ++i) {
-                pc.send(teapotPacket[i]);
-            }
-            teapotPacket[11]++; // packetCount, loops at 0xFF on purpose
-        #endif
-
-        // blink LED to indicate activity
-        led1 = !led1;
+        MPU6050raw::loop();
     }
 }
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