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Bugfix, deco: fix 2 (small) problems with calculated ceiling This fixes 1 trivial, and 1 not really trivial bug in the calculation of the ceiling. When simulating a bounce dive to 80m, things become clear (tried this on a CCR dive, fixed setpoint 1.2bar, about 15 minutes of bottom time). Closely watch the behavior of the ceiling data. At some point during the ascent, the ceiling begins to decrease in 10cm steps. Then suddenly (while still ascending), the ceiling increases again with 1m, does not change for some time, and then suddenly steps 1.1m less deep. While not very relevant to real deco diving, it is simply wrong. The reason for this is subtle. The algorithm used to find the ceiling is a sort of linear search, stepping down a meter, overshoot the depth, and search back in 10cm steps. It seems some numerical instability. Fixing this, was a bit more computational intensive search by stepping up down in equal steps of 10cm. But, I'm pretty sure that things can be speeded up here, as a ceiling does not change fast, so it should be not that difficult to limit the search space, or use a binary search algorithm instead. The trivial second problem fixed, is that the ceiling ends at the surface and not at 1m depth. This small issue became visible after changing the step down size above. Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>
author Jan Mulder <jlmulder@xs4all.nl>
date Sun, 31 Mar 2019 19:35:51 +0200
parents c78bcbd5deda
children
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/* ----------------------------------------------------------------------
* Copyright (C) 2010-2014 ARM Limited. All rights reserved.
*
* $Date:        19. March 2015
* $Revision: 	V.1.4.5
*
* Project: 	    CMSIS DSP Library
* Title:	    arm_const_structs.h
*
* Description:	This file has constant structs that are initialized for
*              user convenience.  For example, some can be given as
*              arguments to the arm_cfft_f32() function.
*
* Target Processor: Cortex-M4/Cortex-M3
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*   - Redistributions of source code must retain the above copyright
*     notice, this list of conditions and the following disclaimer.
*   - 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.
*   - Neither the name of ARM LIMITED 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.
* -------------------------------------------------------------------- */

#ifndef _ARM_CONST_STRUCTS_H
#define _ARM_CONST_STRUCTS_H

#include "arm_math.h"
#include "arm_common_tables.h"

   extern const arm_cfft_instance_f32 arm_cfft_sR_f32_len16;
   extern const arm_cfft_instance_f32 arm_cfft_sR_f32_len32;
   extern const arm_cfft_instance_f32 arm_cfft_sR_f32_len64;
   extern const arm_cfft_instance_f32 arm_cfft_sR_f32_len128;
   extern const arm_cfft_instance_f32 arm_cfft_sR_f32_len256;
   extern const arm_cfft_instance_f32 arm_cfft_sR_f32_len512;
   extern const arm_cfft_instance_f32 arm_cfft_sR_f32_len1024;
   extern const arm_cfft_instance_f32 arm_cfft_sR_f32_len2048;
   extern const arm_cfft_instance_f32 arm_cfft_sR_f32_len4096;

   extern const arm_cfft_instance_q31 arm_cfft_sR_q31_len16;
   extern const arm_cfft_instance_q31 arm_cfft_sR_q31_len32;
   extern const arm_cfft_instance_q31 arm_cfft_sR_q31_len64;
   extern const arm_cfft_instance_q31 arm_cfft_sR_q31_len128;
   extern const arm_cfft_instance_q31 arm_cfft_sR_q31_len256;
   extern const arm_cfft_instance_q31 arm_cfft_sR_q31_len512;
   extern const arm_cfft_instance_q31 arm_cfft_sR_q31_len1024;
   extern const arm_cfft_instance_q31 arm_cfft_sR_q31_len2048;
   extern const arm_cfft_instance_q31 arm_cfft_sR_q31_len4096;

   extern const arm_cfft_instance_q15 arm_cfft_sR_q15_len16;
   extern const arm_cfft_instance_q15 arm_cfft_sR_q15_len32;
   extern const arm_cfft_instance_q15 arm_cfft_sR_q15_len64;
   extern const arm_cfft_instance_q15 arm_cfft_sR_q15_len128;
   extern const arm_cfft_instance_q15 arm_cfft_sR_q15_len256;
   extern const arm_cfft_instance_q15 arm_cfft_sR_q15_len512;
   extern const arm_cfft_instance_q15 arm_cfft_sR_q15_len1024;
   extern const arm_cfft_instance_q15 arm_cfft_sR_q15_len2048;
   extern const arm_cfft_instance_q15 arm_cfft_sR_q15_len4096;

#endif