/**
* returns the mean of samples values of aixs indicated by the index number .
*
* @param index Indicates the axis (x=0,y=1,z=2).
* @return The mean value.
*/
private float getMeanG(int index) {
float t = 0;
for (int i = 1; i <= samples; i++) {
accel.fetchAllAccel(value, AccelUnits.G);
t += value[index];
try {
Thread.sleep(10);
} catch (InterruptedException ex) {
}
}
return t / samples;
}
/**
* returns the mean of N raw values of aixs indicated by the index number .
*
* @param index Indicates the axis (x=0,y=1,z=2).
* @return The mean value.
*/
private float getRawMean(int index) {
int t = 0;
for (int i = 1; i <= samples; i++) {
accel.fetchRawAccel(raw);
t += raw[index];
try {
Thread.sleep(10);
} catch (InterruptedException ex) {
}
}
return t / samples;
}
/**
* Displays the raw value of axis indicated by index. A low pass filter is applied on the raw
* values to make reading easier.
*
* @param index Indicates the axis (x=0,y=1,z=2).
*/
private void showLowPass(int index) {
float alpha = 0.95f;
float lowpassed = 0;
while (!Button.ENTER.isDown()) {
accel.fetchRawAccel(raw);
lowpassed = alpha * raw[index] + (1.0f - alpha) * lowpassed;
LCD.drawString(Double.toString(lowpassed), 0, 3);
try {
Thread.sleep(150);
} catch (InterruptedException ex) {
}
}
while (Button.ENTER.isDown()) ;
}
/**
* Constructor of the <code>AccelCalibration</code> class.
*
* @param accel Accel should have the pointer to the accelerometer class that uses the calibration
* settings. When invoked from within the accelerometer class (as is normal behaviour) the
* invokation looks like this <code>AccelCalibration settings=new AccelCalibration(this);
* </code>
*/
AccelCalibration(Accelerometer accel) {
this.accel = accel;
name = accel.getSensorType();
}
