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view Common/Drivers/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_ltdc_ex.c @ 224:ceecabfddb57 div-fixes-3
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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/** ****************************************************************************** * @file stm32f4xx_hal_ltdc_ex.c * @author MCD Application Team * @brief LTDC Extension HAL module driver. ****************************************************************************** * @attention * * <h2><center>© COPYRIGHT(c) 2017 STMicroelectronics</center></h2> * * 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 of STMicroelectronics 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 HOLDER 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. * ****************************************************************************** */ /* Includes ------------------------------------------------------------------*/ #include "stm32f4xx_hal.h" /** @addtogroup STM32F4xx_HAL_Driver * @{ */ /** @defgroup LTDCEx LTDCEx * @brief LTDC HAL module driver * @{ */ #ifdef HAL_LTDC_MODULE_ENABLED /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Private function prototypes -----------------------------------------------*/ /* Exported functions --------------------------------------------------------*/ /** @defgroup LTDCEx_Exported_Functions LTDC Extended Exported Functions * @{ */ /** @defgroup LTDCEx_Exported_Functions_Group1 Initialization and Configuration functions * @brief Initialization and Configuration functions * @verbatim =============================================================================== ##### Initialization and Configuration functions ##### =============================================================================== [..] This section provides functions allowing to: (+) Initialize and configure the LTDC @endverbatim * @{ */ #if defined(STM32F469xx) || defined(STM32F479xx) /** * @brief Retrieve common parameters from DSI Video mode configuration structure * @param hltdc pointer to a LTDC_HandleTypeDef structure that contains * the configuration information for the LTDC. * @param VidCfg pointer to a DSI_VidCfgTypeDef structure that contains * the DSI video mode configuration parameters * @note The implementation of this function is taking into account the LTDC * polarities inversion as described in the current LTDC specification * @retval HAL status */ HAL_StatusTypeDef HAL_LTDCEx_StructInitFromVideoConfig(LTDC_HandleTypeDef* hltdc, DSI_VidCfgTypeDef *VidCfg) { /* Retrieve signal polarities from DSI */ /* The following polarity is inverted: LTDC_DEPOLARITY_AL <-> LTDC_DEPOLARITY_AH */ /* Note 1 : Code in line w/ Current LTDC specification */ hltdc->Init.DEPolarity = (VidCfg->DEPolarity == DSI_DATA_ENABLE_ACTIVE_HIGH) ? LTDC_DEPOLARITY_AL : LTDC_DEPOLARITY_AH; hltdc->Init.VSPolarity = (VidCfg->VSPolarity == DSI_VSYNC_ACTIVE_HIGH) ? LTDC_VSPOLARITY_AH : LTDC_VSPOLARITY_AL; hltdc->Init.HSPolarity = (VidCfg->HSPolarity == DSI_HSYNC_ACTIVE_HIGH) ? LTDC_HSPOLARITY_AH : LTDC_HSPOLARITY_AL; /* Note 2: Code to be used in case LTDC polarities inversion updated in the specification */ /* hltdc->Init.DEPolarity = VidCfg->DEPolarity << 29; hltdc->Init.VSPolarity = VidCfg->VSPolarity << 29; hltdc->Init.HSPolarity = VidCfg->HSPolarity << 29; */ /* Retrieve vertical timing parameters from DSI */ hltdc->Init.VerticalSync = VidCfg->VerticalSyncActive - 1U; hltdc->Init.AccumulatedVBP = VidCfg->VerticalSyncActive + VidCfg->VerticalBackPorch - 1U; hltdc->Init.AccumulatedActiveH = VidCfg->VerticalSyncActive + VidCfg->VerticalBackPorch + VidCfg->VerticalActive - 1U; hltdc->Init.TotalHeigh = VidCfg->VerticalSyncActive + VidCfg->VerticalBackPorch + VidCfg->VerticalActive + VidCfg->VerticalFrontPorch - 1U; return HAL_OK; } /** * @brief Retrieve common parameters from DSI Adapted command mode configuration structure * @param hltdc pointer to a LTDC_HandleTypeDef structure that contains * the configuration information for the LTDC. * @param CmdCfg pointer to a DSI_CmdCfgTypeDef structure that contains * the DSI command mode configuration parameters * @note The implementation of this function is taking into account the LTDC * polarities inversion as described in the current LTDC specification * @retval HAL status */ HAL_StatusTypeDef HAL_LTDCEx_StructInitFromAdaptedCommandConfig(LTDC_HandleTypeDef* hltdc, DSI_CmdCfgTypeDef *CmdCfg) { /* Retrieve signal polarities from DSI */ /* The following polarities are inverted: LTDC_DEPOLARITY_AL <-> LTDC_DEPOLARITY_AH LTDC_VSPOLARITY_AL <-> LTDC_VSPOLARITY_AH LTDC_HSPOLARITY_AL <-> LTDC_HSPOLARITY_AH)*/ /* Note 1 : Code in line w/ Current LTDC specification */ hltdc->Init.DEPolarity = (CmdCfg->DEPolarity == DSI_DATA_ENABLE_ACTIVE_HIGH) ? LTDC_DEPOLARITY_AL : LTDC_DEPOLARITY_AH; hltdc->Init.VSPolarity = (CmdCfg->VSPolarity == DSI_VSYNC_ACTIVE_HIGH) ? LTDC_VSPOLARITY_AL : LTDC_VSPOLARITY_AH; hltdc->Init.HSPolarity = (CmdCfg->HSPolarity == DSI_HSYNC_ACTIVE_HIGH) ? LTDC_HSPOLARITY_AL : LTDC_HSPOLARITY_AH; /* Note 2: Code to be used in case LTDC polarities inversion updated in the specification */ /* hltdc->Init.DEPolarity = CmdCfg->DEPolarity << 29; hltdc->Init.VSPolarity = CmdCfg->VSPolarity << 29; hltdc->Init.HSPolarity = CmdCfg->HSPolarity << 29; */ return HAL_OK; } #endif /* STM32F469xx || STM32F479xx */ /** * @} */ /** * @} */ #endif /* HAL_DCMI_MODULE_ENABLED */ /** * @} */ /** * @} */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/