Not done - might need - for later
Dependencies: FXOS8700CQ MPU6050IMU mbed
Diff: main.cpp
- Revision:
- 0:7eb9e18d5839
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Tue Mar 31 22:31:41 2015 +0000 @@ -0,0 +1,172 @@ +#include "mbed.h" +#include "MPU6050.h" +#include "FXOS8700CQ.h" + +float sum = 0; +uint32_t sumCount = 0; + +MPU6050 mpu6050; +FXOS8700CQ fxos(PTE25, PTE24, FXOS8700CQ_SLAVE_ADDR1); // SDA, SCL, (addr << 1) + +Timer t; + +InterruptIn fxos_int2(PTC13); // should just be the Data-Ready interrupt +bool fxos_int2_triggered = false; // Interrupt status flags and data + +SRAWDATA accel_data; // Storage for the data from the sensor +SRAWDATA magn_data; + +Serial pc(USBTX, USBRX); // tx, rx + +void trigger_fxos_int2(void){ + fxos_int2_triggered = true; +} + +void print_reading(){ + pc.printf("A X:%5d,Y:%5d,Z:%5d M X:%5d,Y:%5d,Z:%5d\r\n", + accel_data.x, accel_data.y, accel_data.z, + magn_data.x, magn_data.y, magn_data.z); +} + +int main(){ + t.start(); + pc.baud(115200); // 200Hz x line of output data! + + printf("\r\n\nFXOS8700Q Who Am I= %X\r\n", fxos.get_whoami()); + + fxos_int2.fall(&trigger_fxos_int2); // Iterrupt for active-low interrupt line from FXOS + fxos.enable(); + + pc.printf("Started data collection. Accelerometer at max %dg.\r\n", + fxos.get_accel_scale()); + + fxos.get_data(&accel_data, &magn_data); // clear interrupt from device + fxos_int2_triggered = false; // un-trigger + + //Set up I2C + i2c.frequency(400000); // use fast (400 kHz) I2C + + // Read the WHO_AM_I register, this is a good test of communication + uint8_t whoami = mpu6050.readByte(MPU6050_ADDRESS, WHO_AM_I_MPU6050); // Read WHO_AM_I register for MPU-6050 + pc.printf("I AM 0x%x\n\r", whoami); pc.printf("I SHOULD BE 0x68\n\r"); + + if (whoami == 0x68){ // WHO_AM_I should always be 0x68 + pc.printf("MPU6050 is online..."); + wait(1); + + mpu6050.MPU6050SelfTest(SelfTest); // Start by performing self test and reporting values + pc.printf("x-axis self test: acceleration trim within : "); pc.printf("%f", SelfTest[0]); pc.printf("% of factory value \n\r"); + pc.printf("y-axis self test: acceleration trim within : "); pc.printf("%f", SelfTest[1]); pc.printf("% of factory value \n\r"); + pc.printf("z-axis self test: acceleration trim within : "); pc.printf("%f", SelfTest[2]); pc.printf("% of factory value \n\r"); + pc.printf("x-axis self test: gyration trim within : "); pc.printf("%f", SelfTest[3]); pc.printf("% of factory value \n\r"); + pc.printf("y-axis self test: gyration trim within : "); pc.printf("%f", SelfTest[4]); pc.printf("% of factory value \n\r"); + pc.printf("z-axis self test: gyration trim within : "); pc.printf("%f", SelfTest[5]); pc.printf("% of factory value \n\r"); + wait(1); + + if(SelfTest[0] < 1.0f && SelfTest[1] < 1.0f && SelfTest[2] < 1.0f && SelfTest[3] < 1.0f && SelfTest[4] < 1.0f && SelfTest[5] < 1.0f){ + mpu6050.resetMPU6050(); // Reset registers to default in preparation for device calibration + mpu6050.calibrateMPU6050(gyroBias, accelBias); // Calibrate gyro and accelerometers, load biases in bias registers + mpu6050.initMPU6050(); pc.printf("MPU6050 initialized for active data mode....\n\r"); // Initialize device for active mode read of acclerometer, gyroscope, and temperature + wait(2); + }else pc.printf("Device did not the pass self-test!\n\r"); + }else{ + pc.printf("Could not connect to MPU6050: \n\r"); + pc.printf("%#x \n", whoami); + while(1) ; // Loop forever if communication doesn't happen + } + + while(1){ + // If data ready bit set, all data registers have new data + if(mpu6050.readByte(MPU6050_ADDRESS, INT_STATUS) & 0x01) { // check if data ready interrupt + mpu6050.readAccelData(accelCount); // Read the x/y/z adc values + mpu6050.getAres(); + + // 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]; + + mpu6050.readGyroData(gyroCount); // Read the x/y/z adc values + mpu6050.getGres(); + + // 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]; + + tempCount = mpu6050.readTempData(); // Read the x/y/z adc values + temperature = (tempCount) / 340. + 36.53; // Temperature in degrees Centigrade + } + + if(fxos_int2_triggered){ + fxos_int2_triggered = false; // un-trigger + fxos.get_data(&accel_data, &magn_data); + } + + 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 + mpu6050.MadgwickQuaternionUpdate(ax, ay, az, gx*PI/180.0f, gy*PI/180.0f, gz*PI/180.0f); + + // Serial print and/or display at 0.5 s rate independent of data rates + delt_t = t.read_ms() - count; + + 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(" 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; + roll *= 180.0f / PI; + +// pc.printf("Yaw, Pitch, Roll: \n\r"); +// pc.printf("%f", yaw); +// pc.printf(", "); +// pc.printf("%f", pitch); +// pc.printf(", "); +// pc.printf("%f\n\r", roll); +// pc.printf("average rate = "); pc.printf("%f", (sumCount/sum)); pc.printf(" Hz\n\r"); + + pc.printf("Yaw, Pitch, Roll: %f %f %f\n\r", yaw, pitch, roll); + pc.printf("average rate = %f\n\r", (float) sumCount/sum); + + count = t.read_ms(); + sum = 0; + sumCount = 0; +} +} \ No newline at end of file