//force a read and update the global values
float updateHeading( void ){
neinAxis_semaphore = LOCKED;
readMag(global_mag);
readAcc(global_acc);
readGyr(global_gyr);
int acc[3];
acc[xaxis] = global_acc[xaxis];
acc[yaxis] = global_acc[yaxis];
acc[zaxis] = global_acc[zaxis];
int mag[3];
mag[xaxis] = global_mag[xaxis];
mag[yaxis] = global_mag[yaxis];
mag[zaxis] = global_mag[zaxis];
float acc_norm[3];
float mag_norm[3];
//readAcc(acc);
//readMag(mag);
acc_norm[xaxis]=maxAccG*((float) acc[xaxis]/maxAccGRaw);
acc_norm[yaxis]=maxAccG*((float) acc[yaxis]/maxAccGRaw);
acc_norm[zaxis]=maxAccG*((float) acc[zaxis]/maxAccGRaw);
mag_norm[xaxis]=maxMag*((float) mag[xaxis]/maxMagRaw);
mag_norm[yaxis]=maxMag*((float) mag[yaxis]/maxMagRaw);
mag_norm[zaxis]=maxMag*((float) mag[zaxis]/maxMagRaw);
float pitch = asin(acc_norm[xaxis]);
float roll = asin(acc_norm[yaxis]);
float cosRoll = cos(roll);
float sinRoll = sin(roll);
float cosPitch = cos(pitch);
float sinPitch = sin(pitch);
float Xh = mag_norm[xaxis] * cosPitch + mag_norm[zaxis] * sinPitch;
float Yh = mag_norm[xaxis] * sinRoll * sinPitch + mag_norm[yaxis] * cosRoll - mag_norm[zaxis] * sinRoll * cosPitch;
neinAxis_semaphore = UNLOCKED;
return atan2f(Yh, Xh);
}
// Reads all 6 channels of the LSM303 and stores them in the object variables
void LSM303::read(void)
{
readAcc();
readMag();
}
///< Reads all 6 channels of the MagneticSensorLsm303 and stores them in the object variables
void MagneticSensorLsm303::read(void)
{
readAcc();
readMag();
}