Amanda Ghassaei / MPU6050-DMP

sfas

Dependents:   Bracky-MPU6050-DMP

Fork of MPU6050 by Shundo Kishi

MyMPU6050.h@12:775e1464e042, 2015-12-09 (annotated)

Committer:
amandaghassaei
Date:
Wed Dec 09 03:25:10 2015 +0000
Revision:
12:775e1464e042
Parent:
11:feab67f916fe 
enable interrupt

Who changed what in which revision?

UserRevisionLine numberNew contents of line
amandaghassaei 6:748bae310e1e 1 // I2C device class (I2Cdev) demonstration Arduino sketch for MPU6050 class using DMP (MotionApps v2.0)
amandaghassaei 6:748bae310e1e 2 // 6/21/2012 by Jeff Rowberg <jeff@rowberg.net>
amandaghassaei 6:748bae310e1e 3 /* ============================================
amandaghassaei 6:748bae310e1e 4 I2Cdev device library code is placed under the MIT license
amandaghassaei 6:748bae310e1e 5 Copyright (c) 2012 Jeff Rowberg
amandaghassaei 6:748bae310e1e 6 */
amandaghassaei 6:748bae310e1e 7
amandaghassaei 6:748bae310e1e 8 #include "I2Cdev.h"
amandaghassaei 6:748bae310e1e 9 #include "MPU6050_6Axis_MotionApps20.h"
amandaghassaei 7:07f1f975429a 10 # define M_PI 3.14159265358979323846
amandaghassaei 6:748bae310e1e 11
amandaghassaei 9:ac76b5b24b18 12
amandaghassaei 7:07f1f975429a 13 class MyMPU6050 {
amandaghassaei 6:748bae310e1e 14
amandaghassaei 6:748bae310e1e 15 public:
amandaghassaei 6:748bae310e1e 16
amandaghassaei 7:07f1f975429a 17 MyMPU6050(PinName i2cSda, PinName i2cScl, PinName interrupt) : mpu(i2cSda, i2cScl), checkpin(interrupt){
amandaghassaei 9:ac76b5b24b18 18 resetTheta();
amandaghassaei 8:96fa92188874 19 }
amandaghassaei 8:96fa92188874 20
amandaghassaei 8:96fa92188874 21 void setPC(Serial *pc){
amandaghassaei 8:96fa92188874 22 _pc = pc;
amandaghassaei 6:748bae310e1e 23 }
amandaghassaei 6:748bae310e1e 24
amandaghassaei 6:748bae310e1e 25 void loop() {
amandaghassaei 6:748bae310e1e 26 // if programming failed, don't try to do anything
amandaghassaei 6:748bae310e1e 27 if (!dmpReady) return;
amandaghassaei 10:6167cc7e7d60 28
amandaghassaei 10:6167cc7e7d60 29 // _pc->printf("dmp ready\n");
amandaghassaei 10:6167cc7e7d60 30
amandaghassaei 6:748bae310e1e 31 // wait for MPU interrupt or extra packet(s) available
amandaghassaei 6:748bae310e1e 32 if (!mpuInterrupt && fifoCount < packetSize) {
amandaghassaei 6:748bae310e1e 33 return;
amandaghassaei 6:748bae310e1e 34 // other program behavior stuff here
amandaghassaei 6:748bae310e1e 35 // .
amandaghassaei 6:748bae310e1e 36 // .
amandaghassaei 6:748bae310e1e 37 // .
amandaghassaei 6:748bae310e1e 38 // if you are really paranoid you can frequently test in between other
amandaghassaei 6:748bae310e1e 39 // stuff to see if mpuInterrupt is true, and if so, "break;" from the
amandaghassaei 6:748bae310e1e 40 // while() loop to immediately process the MPU data
amandaghassaei 6:748bae310e1e 41 // .
amandaghassaei 6:748bae310e1e 42 // .
amandaghassaei 6:748bae310e1e 43 // .
amandaghassaei 6:748bae310e1e 44 }
amandaghassaei 10:6167cc7e7d60 45
amandaghassaei 10:6167cc7e7d60 46 // _pc->printf("mpu interrupt \n");
amandaghassaei 10:6167cc7e7d60 47
amandaghassaei 6:748bae310e1e 48 // reset interrupt flag and get INT_STATUS byte
amandaghassaei 6:748bae310e1e 49 mpuInterrupt = false;
amandaghassaei 6:748bae310e1e 50 mpuIntStatus = mpu.getIntStatus();
amandaghassaei 6:748bae310e1e 51
amandaghassaei 6:748bae310e1e 52 // get current FIFO count
amandaghassaei 6:748bae310e1e 53 fifoCount = mpu.getFIFOCount();
amandaghassaei 6:748bae310e1e 54
amandaghassaei 6:748bae310e1e 55 // check for overflow (this should never happen unless our code is too inefficient)
amandaghassaei 6:748bae310e1e 56 if ((mpuIntStatus & 0x10) || fifoCount == 1024) {
amandaghassaei 6:748bae310e1e 57 // reset so we can continue cleanly
amandaghassaei 6:748bae310e1e 58 mpu.resetFIFO();
amandaghassaei 11:feab67f916fe 59 // _pc->printf("FIFO overflow!\n");
amandaghassaei 6:748bae310e1e 60
amandaghassaei 6:748bae310e1e 61 // otherwise, check for DMP data ready interrupt (this should happen frequently)
amandaghassaei 6:748bae310e1e 62 } else if (mpuIntStatus & 0x02) {
amandaghassaei 6:748bae310e1e 63 // wait for correct available data length, should be a VERY short wait
amandaghassaei 6:748bae310e1e 64 while (fifoCount < packetSize) fifoCount = mpu.getFIFOCount();
amandaghassaei 6:748bae310e1e 65
amandaghassaei 6:748bae310e1e 66 // read a packet from FIFO
amandaghassaei 6:748bae310e1e 67 mpu.getFIFOBytes(fifoBuffer, packetSize);
amandaghassaei 6:748bae310e1e 68
amandaghassaei 6:748bae310e1e 69 // track FIFO count here in case there is > 1 packet available
amandaghassaei 6:748bae310e1e 70 // (this lets us immediately read more without waiting for an interrupt)
amandaghassaei 6:748bae310e1e 71 fifoCount -= packetSize;
amandaghassaei 6:748bae310e1e 72
amandaghassaei 6:748bae310e1e 73 // display Euler angles in degrees
amandaghassaei 6:748bae310e1e 74 mpu.dmpGetQuaternion(&q, fifoBuffer);
amandaghassaei 6:748bae310e1e 75 mpu.dmpGetGravity(&gravity, &q);
amandaghassaei 6:748bae310e1e 76 mpu.dmpGetYawPitchRoll(ypr, &q, &gravity);
amandaghassaei 6:748bae310e1e 77 mpu.dmpGetYawPitchRoll(ypr, &q, &gravity);
amandaghassaei 9:ac76b5b24b18 78 float newTheta;
amandaghassaei 9:ac76b5b24b18 79 if (ypr[1]>0) newTheta = ypr[2];
amandaghassaei 9:ac76b5b24b18 80 else if (ypr[2]<0) newTheta = -M_PI-ypr[2];
amandaghassaei 9:ac76b5b24b18 81 else newTheta = M_PI-ypr[2];
amandaghassaei 9:ac76b5b24b18 82
amandaghassaei 9:ac76b5b24b18 83 mpu.dmpGetGyro(gyroData, fifoBuffer);
amandaghassaei 11:feab67f916fe 84 float newDTheta = -gyroData[2]/180.0*M_PI;
amandaghassaei 9:ac76b5b24b18 85
amandaghassaei 9:ac76b5b24b18 86 if (!thetaInitFlag && abs(newTheta-theta)>0.3) {
amandaghassaei 10:6167cc7e7d60 87 // _pc->printf("IMU interrupt clash\n");
amandaghassaei 9:ac76b5b24b18 88 mpu.resetFIFO();
amandaghassaei 9:ac76b5b24b18 89 } else {
amandaghassaei 9:ac76b5b24b18 90 thetaInitFlag = false;
amandaghassaei 9:ac76b5b24b18 91 theta = newTheta;
amandaghassaei 9:ac76b5b24b18 92 dtheta = newDTheta;
amandaghassaei 10:6167cc7e7d60 93 // _pc->printf("loop %f\n", theta);
amandaghassaei 9:ac76b5b24b18 94 }
amandaghassaei 8:96fa92188874 95
amandaghassaei 9:ac76b5b24b18 96
amandaghassaei 9:ac76b5b24b18 97
amandaghassaei 6:748bae310e1e 98 }
amandaghassaei 6:748bae310e1e 99 }
amandaghassaei 6:748bae310e1e 100
amandaghassaei 6:748bae310e1e 101 void dmpDataReady() {
amandaghassaei 6:748bae310e1e 102 mpuInterrupt = true;
amandaghassaei 6:748bae310e1e 103 }
amandaghassaei 6:748bae310e1e 104
amandaghassaei 6:748bae310e1e 105 float getTheta(){
amandaghassaei 10:6167cc7e7d60 106 // _pc->printf("%f\n", theta);
amandaghassaei 6:748bae310e1e 107 return theta;
amandaghassaei 6:748bae310e1e 108 }
amandaghassaei 6:748bae310e1e 109
amandaghassaei 7:07f1f975429a 110 float getDTheta(){
amandaghassaei 6:748bae310e1e 111 return dtheta;
amandaghassaei 6:748bae310e1e 112 }
amandaghassaei 8:96fa92188874 113
amandaghassaei 8:96fa92188874 114 void disable(){
amandaghassaei 8:96fa92188874 115 dmpReady = false;
amandaghassaei 8:96fa92188874 116 mpuInterrupt = false;
amandaghassaei 8:96fa92188874 117 checkpin.rise(NULL);
amandaghassaei 8:96fa92188874 118 }
amandaghassaei 8:96fa92188874 119
amandaghassaei 10:6167cc7e7d60 120 void disableInterrupt(){
amandaghassaei 10:6167cc7e7d60 121 mpuInterrupt = false;
amandaghassaei 10:6167cc7e7d60 122 checkpin.rise(NULL);
amandaghassaei 10:6167cc7e7d60 123 }
amandaghassaei 10:6167cc7e7d60 124
amandaghassaei 8:96fa92188874 125 void enable(){
amandaghassaei 8:96fa92188874 126 setup();
amandaghassaei 8:96fa92188874 127 }
amandaghassaei 10:6167cc7e7d60 128
amandaghassaei 10:6167cc7e7d60 129 void enableInterrupt(){
amandaghassaei 10:6167cc7e7d60 130 checkpin.rise(this, &MyMPU6050::dmpDataReady);
amandaghassaei 10:6167cc7e7d60 131 }
amandaghassaei 6:748bae310e1e 132
amandaghassaei 6:748bae310e1e 133 private:
amandaghassaei 7:07f1f975429a 134
amandaghassaei 8:96fa92188874 135 Serial *_pc;
amandaghassaei 8:96fa92188874 136
amandaghassaei 6:748bae310e1e 137 MPU6050 mpu;
amandaghassaei 6:748bae310e1e 138
amandaghassaei 6:748bae310e1e 139 bool dmpReady; // set true if DMP init was successful
amandaghassaei 6:748bae310e1e 140 uint8_t mpuIntStatus; // holds actual interrupt status byte from MPU
amandaghassaei 6:748bae310e1e 141 uint8_t devStatus; // return status after each device operation (0 = success, !0 = error)
amandaghassaei 6:748bae310e1e 142 uint16_t packetSize; // expected DMP packet size (default is 42 bytes)
amandaghassaei 6:748bae310e1e 143 uint16_t fifoCount; // count of all bytes currently in FIFO
amandaghassaei 6:748bae310e1e 144 uint8_t fifoBuffer[64]; // FIFO storage buffer
amandaghassaei 6:748bae310e1e 145
amandaghassaei 6:748bae310e1e 146 // orientation/motion vars
amandaghassaei 6:748bae310e1e 147 Quaternion q; // [w, x, y, z] quaternion container
amandaghassaei 6:748bae310e1e 148 VectorFloat gravity; // [x, y, z] gravity vector
amandaghassaei 6:748bae310e1e 149 float ypr[3]; // [yaw, pitch, roll] yaw/pitch/roll container and gravity vector
amandaghassaei 6:748bae310e1e 150 int16_t gyroData[3];
amandaghassaei 10:6167cc7e7d60 151 volatile float theta;
amandaghassaei 9:ac76b5b24b18 152 bool thetaInitFlag;
amandaghassaei 10:6167cc7e7d60 153 volatile float dtheta;
amandaghassaei 6:748bae310e1e 154
amandaghassaei 6:748bae310e1e 155 InterruptIn checkpin;
amandaghassaei 6:748bae310e1e 156 volatile bool mpuInterrupt;
amandaghassaei 6:748bae310e1e 157
amandaghassaei 7:07f1f975429a 158
amandaghassaei 9:ac76b5b24b18 159 void resetTheta(){
amandaghassaei 9:ac76b5b24b18 160 theta = 0;
amandaghassaei 9:ac76b5b24b18 161 dtheta = 0;
amandaghassaei 9:ac76b5b24b18 162 thetaInitFlag = true;
amandaghassaei 9:ac76b5b24b18 163 }
amandaghassaei 9:ac76b5b24b18 164
amandaghassaei 6:748bae310e1e 165 void setup() {
amandaghassaei 6:748bae310e1e 166
amandaghassaei 9:ac76b5b24b18 167 resetTheta();
amandaghassaei 6:748bae310e1e 168
amandaghassaei 6:748bae310e1e 169 dmpReady = false;
amandaghassaei 6:748bae310e1e 170 mpuInterrupt = false; // indicates whether MPU interrupt pin has gone high
amandaghassaei 6:748bae310e1e 171
amandaghassaei 6:748bae310e1e 172 // initialize device
amandaghassaei 6:748bae310e1e 173 // pc.printf("Initializing I2C devices...\r\n");
amandaghassaei 6:748bae310e1e 174 mpu.initialize();
amandaghassaei 6:748bae310e1e 175
amandaghassaei 6:748bae310e1e 176 // verify connection
amandaghassaei 6:748bae310e1e 177 // pc.printf("Testing device connections...\r\n");
amandaghassaei 6:748bae310e1e 178 mpu.testConnection();//if() pc.printf("MPU6050 connection successful\r\n");
amandaghassaei 6:748bae310e1e 179 // else pc.printf("MPU6050 connection failed\r\n");
amandaghassaei 6:748bae310e1e 180
amandaghassaei 6:748bae310e1e 181 // load and configure the DMP
amandaghassaei 6:748bae310e1e 182 // pc.printf("Initializing DMP...\r\n");
amandaghassaei 6:748bae310e1e 183 devStatus = mpu.dmpInitialize();
amandaghassaei 6:748bae310e1e 184
amandaghassaei 6:748bae310e1e 185 // make sure it worked (returns 0 if so)
amandaghassaei 6:748bae310e1e 186 if (devStatus == 0) {
amandaghassaei 6:748bae310e1e 187 // turn on the DMP, now that it's ready
amandaghassaei 6:748bae310e1e 188 // pc.printf("Enabling DMP...\r\n");
amandaghassaei 6:748bae310e1e 189 mpu.setDMPEnabled(true);
amandaghassaei 6:748bae310e1e 190
amandaghassaei 6:748bae310e1e 191 // enable Arduino interrupt detection
amandaghassaei 6:748bae310e1e 192 // pc.printf("Enabling interrupt detection (Arduino external interrupt 0)...\r\n");
amandaghassaei 6:748bae310e1e 193 checkpin.rise(this, &MyMPU6050::dmpDataReady);
amandaghassaei 6:748bae310e1e 194
amandaghassaei 6:748bae310e1e 195 mpuIntStatus = mpu.getIntStatus();
amandaghassaei 6:748bae310e1e 196
amandaghassaei 6:748bae310e1e 197 // set our DMP Ready flag so the main loop() function knows it's okay to use it
amandaghassaei 6:748bae310e1e 198 // pc.printf("DMP ready! Waiting for first interrupt...\r\n");
amandaghassaei 6:748bae310e1e 199 dmpReady = true;
amandaghassaei 6:748bae310e1e 200
amandaghassaei 6:748bae310e1e 201 // get expected DMP packet size for later comparison
amandaghassaei 6:748bae310e1e 202 packetSize = mpu.dmpGetFIFOPacketSize();
amandaghassaei 6:748bae310e1e 203 } else {
amandaghassaei 6:748bae310e1e 204 // ERROR!
amandaghassaei 6:748bae310e1e 205 // 1 = initial memory load failed
amandaghassaei 6:748bae310e1e 206 // 2 = DMP configuration updates failed
amandaghassaei 6:748bae310e1e 207 // (if it's going to break, usually the code will be 1)
amandaghassaei 6:748bae310e1e 208
amandaghassaei 6:748bae310e1e 209 // pc.printf("DDMP Initialization failed (code ");
amandaghassaei 6:748bae310e1e 210 // pc.printf("%d", devStatus);
amandaghassaei 6:748bae310e1e 211 // pc.printf(")\r\n");
amandaghassaei 6:748bae310e1e 212 }
amandaghassaei 6:748bae310e1e 213
amandaghassaei 6:748bae310e1e 214 }
amandaghassaei 6:748bae310e1e 215 };