a
Dependencies: mbed BMP280 MPU9250
Diff: main.cpp
- Revision:
- 0:16eae2d34f40
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Sun Feb 16 07:52:53 2020 +0000 @@ -0,0 +1,171 @@ +#include"mbed.h" +#include"MPU9255.h" + +float sum = 0; +uint32_t sumCount = 0; + +MPU9255 mpu9255; + +Timer t; + +RawSerial pc(USBTX, USBRX, 9600); + + +int main(void) +{ + uint8_t whoami = mpu9255.readByte(MPU9255_ADDRESS, WHO_AM_I_MPU9255); // Read WHO_AM_I register for MPU-9255 + pc.printf("I AM 0x%x\n\r", whoami); + pc.printf("I SHOULD BE 0x73\n\r"); //if you use mpu9255, it should be 0x73 + + if (whoami == 0x73) // WHO_AM_I should always be 0x68 + { + pc.printf("MPU9255 is online...\n\r"); + wait(1); + + + mpu9255.resetMPU9255(); // Reset registers to default in preparation for device calibration + mpu9255.initMPU9255(); // Initialize MPU925 + pc.printf("MPU9255 initialized for active data mode....\n\r"); + mpu9255.calibrateMPU9255(gyroBias, accelBias); // Calibrate gyro and accelerometers, load biases in bias registers + pc.printf("x gyro bias = %f\n\r", gyroBias[0]); + pc.printf("y gyro bias = %f\n\r", gyroBias[1]); + pc.printf("z gyro bias = %f\n\r", gyroBias[2]); + pc.printf("x accel bias = %f\n\r", accelBias[0]); + pc.printf("y accel bias = %f\n\r", accelBias[1]); + pc.printf("z accel bias = %f\n\r", accelBias[2]); + wait(2); + //mpu9255.initMPU9255(); + //pc.printf("MPU9255 initialized for active data mode....\n\r"); // Initialize device for active mode read of acclerometer, gyroscope, and temperature + mpu9255.resetAK8963(); + mpu9255.initAK8963(magCalibration); + pc.printf("AK8963 initialized for active data mode....\n\r"); // Initialize device for active mode read of magnetometer + pc.printf("Accelerometer full-scale range = %f g\n\r", 2.0f*(float)(1<<Ascale)); + pc.printf("Gyroscope full-scale range = %f deg/s\n\r", 250.0f*(float)(1<<Gscale)); + if(Mscale == 0) pc.printf("Magnetometer resolution = 14 bits\n\r"); + if(Mscale == 1) pc.printf("Magnetometer resolution = 16 bits\n\r"); + if(Mmode == 2) pc.printf("Magnetometer ODR = 8 Hz\n\r"); + if(Mmode == 6) pc.printf("Magnetometer ODR = 100 Hz\n\r"); + wait(2); + } + else + { + pc.printf("Could not connect to MPU9255: \n\r"); + pc.printf("%#x \n", whoami); + + + + while(1) ; // Loop forever if communication doesn't happen + } + + mpu9255.getAres(); // Get accelerometer sensitivity + mpu9255.getGres(); // Get gyro sensitivity + mpu9255.getMres(); // Get magnetometer sensitivity + pc.printf("Accelerometer sensitivity is %f LSB/g \n\r", 1.0f/aRes); + pc.printf("Gyroscope sensitivity is %f LSB/deg/s \n\r", 1.0f/gRes); + pc.printf("Magnetometer sensitivity is %f LSB/G \n\r", 1.0f/mRes); + magbias[0] = +470.; // User environmental x-axis correction in milliGauss, should be automatically calculated + magbias[1] = +120.; // User environmental x-axis correction in milliGauss + magbias[2] = +125.; // User environmental x-axis correction in milliGauss + + while(1) { + + // If intPin goes high, all data registers have new data + if(mpu9255.readByte(MPU9255_ADDRESS, INT_STATUS) & 0x01) { // On interrupt, check if data ready interrupt + + mpu9255.readAccelData(accelCount); // Read the x/y/z adc values + // Now we'll calculate the accleration value into actual g's + ax = (float)accelCount[0]*aRes - accelBias[0]; // get actual g value, this depends on scale being set + ay = (float)accelCount[1]*aRes - accelBias[1]; + az = (float)accelCount[2]*aRes - accelBias[2]; + + mpu9255.readGyroData(gyroCount); // Read the x/y/z adc values + // Calculate the gyro value into actual degrees per second + gx = (float)gyroCount[0]*gRes - gyroBias[0]; // get actual gyro value, this depends on scale being set + gy = (float)gyroCount[1]*gRes - gyroBias[1]; + gz = (float)gyroCount[2]*gRes - gyroBias[2]; + + mpu9255.readMagData(magCount); // Read the x/y/z adc values + // Calculate the magnetometer values in milliGauss + // Include factory calibration per data sheet and user environmental corrections + mx = (float)magCount[0]*mRes*magCalibration[0] - magbias[0]; // get actual magnetometer value, this depends on scale being set + my = (float)magCount[1]*mRes*magCalibration[1] - magbias[1]; + mz = (float)magCount[2]*mRes*magCalibration[2] - magbias[2]; + } + + Now = t.read_us(); + deltat = (float)((Now - lastUpdate)/1000000.0f) ; // set integration time by time elapsed since last filter update + lastUpdate = Now; + + sum += deltat; + sumCount++; + +// if(lastUpdate - firstUpdate > 10000000.0f) { +// beta = 0.04; // decrease filter gain after stabilized +// zeta = 0.015; // increasey bias drift gain after stabilized + // } + + // Pass gyro rate as rad/s + mpu9255.MadgwickQuaternionUpdate(ax, ay, az, gx*PI/180.0f, gy*PI/180.0f, gz*PI/180.0f, my, mx, mz); + // mpu9255.MahonyQuaternionUpdate(ax, ay, az, gx*PI/180.0f, gy*PI/180.0f, gz*PI/180.0f, my, mx, mz); + + // Serial print and/or display at 0.5 s rate independent of data rates + delt_t = t.read_ms() - count_display; + //if (delt_t > 500) { // update LCD once per half-second independent of read rate + //if (t.read_ms() > 500){ + //while(1){ + + pc.printf("ax = %f", 1000*ax); + pc.printf(" ay = %f", 1000*ay); + pc.printf(" az = %f mg\n\r", 1000*az); + + pc.printf("gx = %f", gx); + pc.printf(" gy = %f", gy); + pc.printf(" gz = %f deg/s\n\r", gz); + + pc.printf("mx = %f", mx); + pc.printf(" my = %f", my); + pc.printf(" mz = %f mG\n\r", mz); + + pc.printf("\r\n"); + + /*tempCount = mpu9255.readTempData(); // Read the adc values + temperature = ((float) tempCount) / 333.87f + 21.0f; // Temperature in degrees Centigrade + pc.printf(" temperature = %f C\n\r", temperature); + + pc.printf("q0 = %f\n\r", q[0]); + pc.printf("q1 = %f\n\r", q[1]); + pc.printf("q2 = %f\n\r", q[2]); + pc.printf("q3 = %f\n\r", q[3]); + + + + // Define output variables from updated quaternion---these are Tait-Bryan angles, commonly used in aircraft orientation. + // In this coordinate system, the positive z-axis is down toward Earth. + // Yaw is the angle between Sensor x-axis and Earth magnetic North (or true North if corrected for local declination, looking down on the sensor positive yaw is counterclockwise. + // Pitch is angle between sensor x-axis and Earth ground plane, toward the Earth is positive, up toward the sky is negative. + // Roll is angle between sensor y-axis and Earth ground plane, y-axis up is positive roll. + // These arise from the definition of the homogeneous rotation matrix constructed from quaternions. + // Tait-Bryan angles as well as Euler angles are non-commutative; that is, the get the correct orientation the rotations must be + // applied in the correct order which for this configuration is yaw, pitch, and then roll. + // For more see http://en.wikipedia.org/wiki/Conversion_between_quaternions_and_Euler_angles which has additional links. + yaw = atan2(2.0f * (q[1] * q[2] + q[0] * q[3]), q[0] * q[0] + q[1] * q[1] - q[2] * q[2] - q[3] * q[3]); + pitch = -asin(2.0f * (q[1] * q[3] - q[0] * q[2])); + roll = atan2(2.0f * (q[0] * q[1] + q[2] * q[3]), q[0] * q[0] - q[1] * q[1] - q[2] * q[2] + q[3] * q[3]); + pitch *= 180.0f / PI; + yaw *= 180.0f / PI; + yaw -= 7.6f; // Declination at Danville, California is 13 degrees 48 minutes and 47 seconds on 2014-04-04 + roll *= 180.0f / PI; + + pc.printf("Yaw, Pitch, Roll: %f %f %f\n\r", yaw, pitch, roll); + pc.printf("average rate = %f\n\r", (float) sumCount/sum); + + myled= !myled; + count_display = t.read_ms(); + sum = 0; + sumCount = 0; */ + + wait_ms(2000); +//} +} +} + \ No newline at end of file