Mercurial > public > ostc4
view Small_CPU/Inc/tm_stm32f4_otp.h @ 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 | 5f11787b4f42 |
children |
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/** * @author Tilen Majerle * @email tilen@majerle.eu * @website http://stm32f4-discovery.com * @link http://stm32f4-discovery.com/2015/01/library-49-one-time-programmable-otp-bytes-on-stm32f4xx * @version v1.0 * @ide Keil uVision * @license GNU GPL v3 * @brief OTP (One-Time Programmable) flash section library for STM32F4xx * @verbatim ---------------------------------------------------------------------- Copyright (C) Tilen Majerle, 2015 This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. ---------------------------------------------------------------------- @endverbatim */ #ifndef TM_STM32F4_OPT_H #define TM_STM32F4_OPT_H /* C++ detection */ #ifdef __cplusplus extern "C" { #endif /** * @addtogroup TM_STM32F4xx_Libraries * @{ */ /** * @defgroup TM_OTP * @brief OTP (One-Time Programmable) flash section library for STM32F4xx - http://stm32f4-discovery.com/2015/01/library-49-one-time-programmable-otp-bytes-on-stm32f4xx * @{ * * \par Changelog * @verbatim Version 1.0 - First release @endverbatim * * \par Dependencies * @verbatim - STM32F4xx - STM32F4xx RCC - STM32F4xx FLASH - defines.h @endverbatim */ //#include "stm32f4xx.h" //#include "stm32f4xx_rcc.h" //#include "stm32f4xx_flash.h" //#include "defines.h" #include "stm32f4xx_hal.h" /** * @defgroup TM_OTP_Macros * @brief Library defines * @{ */ /** * @brief OTP memory start address */ #define OTP_START_ADDR (0x1FFF7800) /** * @brief OTP memory lock address */ #define OTP_LOCK_ADDR (0x1FFF7A00) /** * @brief Number of OTP blocks */ #define OTP_BLOCKS 16 /** * @brief Number of bytes in one block */ #define OTP_BYTES_IN_BLOCK 32 /** * @brief Number of all OTP bytes */ #define OTP_SIZE (OTP_BLOCKS * OTP_BYTES_IN_BLOCK) /** * @} */ /** * @defgroup TM_OTP_Functions * @brief Library Functions * @{ */ /** * @brief Writes one-time data to specific block and specific byte in this block * @note You can only ONCE write data at desired byte in specific block, if you will try to do it more times, you can have broken data at this location. * @param block: OTP block number, 0 to 15 is allowed * @param byte: OTP byte inside one block, 0 to 31 is allowed * @param data: Data to be written to OTP memory * @retval Member of @ref TM_OTP_Result_t enumeration */ HAL_StatusTypeDef TM_OTP_Write(uint8_t block, uint8_t byte, uint8_t data); /** * @brief Reads data from specific block and specific byte in this block * @note You can read data unlimited times from locations * @param block: OTP block number, 0 to 15 is allowed * @param byte: OTP byte inside one block, 0 to 31 is allowed * @retval Value at specific block and byte location, or 0 if location is invalid */ uint8_t TM_OTP_Read(uint8_t block, uint8_t byte); /** * @} */ /** * @} */ /** * @} */ /* C++ detection */ #ifdef __cplusplus } #endif #endif // TM_STM32F4_OPT_H