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author | Lorenz Meier <lm@inf.ethz.ch> | 2013-08-28 08:14:13 +0200 |
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committer | Lorenz Meier <lm@inf.ethz.ch> | 2013-08-28 08:14:13 +0200 |
commit | 5fe3c49ba0e7e3f64f5b6c9b64ced675c01b14fe (patch) | |
tree | 5f024477d370d92edacead7412f60f6757cbf082 /src/modules/systemlib/conversions.c | |
parent | e44d134c6c64535f67e26f9633206aba50a10613 (diff) | |
parent | 66c61fbe96e11ee7099431a8370d84f862543810 (diff) | |
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Merged multirotor branch
Diffstat (limited to 'src/modules/systemlib/conversions.c')
-rw-r--r-- | src/modules/systemlib/conversions.c | 97 |
1 files changed, 0 insertions, 97 deletions
diff --git a/src/modules/systemlib/conversions.c b/src/modules/systemlib/conversions.c index ac94252c5..9105d83cb 100644 --- a/src/modules/systemlib/conversions.c +++ b/src/modules/systemlib/conversions.c @@ -55,100 +55,3 @@ int16_t_from_bytes(uint8_t bytes[]) return u.w; } - -void rot2quat(const float R[9], float Q[4]) -{ - float q0_2; - float q1_2; - float q2_2; - float q3_2; - int32_t idx; - - /* conversion of rotation matrix to quaternion - * choose the largest component to begin with */ - q0_2 = (((1.0F + R[0]) + R[4]) + R[8]) / 4.0F; - q1_2 = (((1.0F + R[0]) - R[4]) - R[8]) / 4.0F; - q2_2 = (((1.0F - R[0]) + R[4]) - R[8]) / 4.0F; - q3_2 = (((1.0F - R[0]) - R[4]) + R[8]) / 4.0F; - - idx = 0; - - if (q0_2 < q1_2) { - q0_2 = q1_2; - - idx = 1; - } - - if (q0_2 < q2_2) { - q0_2 = q2_2; - idx = 2; - } - - if (q0_2 < q3_2) { - q0_2 = q3_2; - idx = 3; - } - - q0_2 = sqrtf(q0_2); - - /* solve for the remaining three components */ - if (idx == 0) { - q1_2 = q0_2; - q2_2 = (R[5] - R[7]) / 4.0F / q0_2; - q3_2 = (R[6] - R[2]) / 4.0F / q0_2; - q0_2 = (R[1] - R[3]) / 4.0F / q0_2; - - } else if (idx == 1) { - q2_2 = q0_2; - q1_2 = (R[5] - R[7]) / 4.0F / q0_2; - q3_2 = (R[3] + R[1]) / 4.0F / q0_2; - q0_2 = (R[6] + R[2]) / 4.0F / q0_2; - - } else if (idx == 2) { - q3_2 = q0_2; - q1_2 = (R[6] - R[2]) / 4.0F / q0_2; - q2_2 = (R[3] + R[1]) / 4.0F / q0_2; - q0_2 = (R[7] + R[5]) / 4.0F / q0_2; - - } else { - q1_2 = (R[1] - R[3]) / 4.0F / q0_2; - q2_2 = (R[6] + R[2]) / 4.0F / q0_2; - q3_2 = (R[7] + R[5]) / 4.0F / q0_2; - } - - /* return values */ - Q[0] = q1_2; - Q[1] = q2_2; - Q[2] = q3_2; - Q[3] = q0_2; -} - -void quat2rot(const float Q[4], float R[9]) -{ - float q0_2; - float q1_2; - float q2_2; - float q3_2; - - memset(&R[0], 0, 9U * sizeof(float)); - - q0_2 = Q[0] * Q[0]; - q1_2 = Q[1] * Q[1]; - q2_2 = Q[2] * Q[2]; - q3_2 = Q[3] * Q[3]; - - R[0] = ((q0_2 + q1_2) - q2_2) - q3_2; - R[3] = 2.0F * (Q[1] * Q[2] - Q[0] * Q[3]); - R[6] = 2.0F * (Q[1] * Q[3] + Q[0] * Q[2]); - R[1] = 2.0F * (Q[1] * Q[2] + Q[0] * Q[3]); - R[4] = ((q0_2 + q2_2) - q1_2) - q3_2; - R[7] = 2.0F * (Q[2] * Q[3] - Q[0] * Q[1]); - R[2] = 2.0F * (Q[1] * Q[3] - Q[0] * Q[2]); - R[5] = 2.0F * (Q[2] * Q[3] + Q[0] * Q[1]); - R[8] = ((q0_2 + q3_2) - q1_2) - q2_2; -} - -float get_air_density(float static_pressure, float temperature_celsius) -{ - return static_pressure / (CONSTANTS_AIR_GAS_CONST * (temperature_celsius - CONSTANTS_ABSOLUTE_NULL_CELSIUS)); -} |