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Diffstat (limited to 'apps/systemlib/conversions.c')
| -rw-r--r-- | apps/systemlib/conversions.c | 154 |
1 files changed, 0 insertions, 154 deletions
diff --git a/apps/systemlib/conversions.c b/apps/systemlib/conversions.c deleted file mode 100644 index ac94252c5..000000000 --- a/apps/systemlib/conversions.c +++ /dev/null @@ -1,154 +0,0 @@ -/**************************************************************************** - * - * Copyright (C) 2012 PX4 Development Team. All rights reserved. - * Author: @author Lorenz Meier <lm@inf.ethz.ch> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name PX4 nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ****************************************************************************/ - -/** - * @file conversions.c - * Implementation of commonly used conversions. - */ - -#include <nuttx/config.h> -#include <float.h> - -#include "conversions.h" - -int16_t -int16_t_from_bytes(uint8_t bytes[]) -{ - union { - uint8_t b[2]; - int16_t w; - } u; - - u.b[1] = bytes[0]; - u.b[0] = bytes[1]; - - 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)); -} |