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Buelmann: new implementation for ceiling Since my first functional fix in the ceiling computation in commit ceecabfddb57, I noticed that the computation used a linear search, that became rather computational expensive after that commit. The simple question is: why not a binary search? So, this commit implements the binary search. But there is a long story attached to this. Comparing ceiling results from hwOS and this OSTC4 code were very different. Basically, the original OSTC4 algorithm computed the ceiling using the same GFlow to GFhigh slope, in such a way, that the ceiling was in sync with the presented deco stops, where the hwOS code presents a GFhigh based ceiling. This said, it is more logical when the OSTC4 and hwOS code give similar results. This new recursive algorithm gives very similar results for the ceiling compared to hwOS. To be complete here, the Buelmann ceiling is the depth to which you can ascend, so that the leading tissue reaches GFhigh. This also explains why the deepest deco stop is normally deeper than the ceiling (unless one dives with GF like 80/80). The code implemented here is rather straightforward recursion. Signed-off-by: Jan Mulder <jlmulder@xs4all.nl>
author Jan Mulder <jlmulder@xs4all.nl>
date Thu, 11 Apr 2019 17:48:48 +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