Mercurial > public > ostc4
view Small_CPU/Inc/RTE_FlashAccess.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 | 91a8f9893e68 |
line wrap: on
line source
/** ****************************************************************************** * @file RTE_FLashAccess.h based on BonexFLashAccess.h based on firmwareEraseProgram.h * @author heinrichs weikamp gmbh * @version V0.0.1 * @date 20-July-2016 * @version V0.0.1 * @since 20-July-2016 * @brief erase and program the STM32F4xx internal FLASH memory for compasss calib etc. * @verbatim ============================================================================== ##### How to use ##### ============================================================================== @endverbatim ****************************************************************************** * @attention * * <h2><center>© COPYRIGHT(c) 2016 heinrichs weikamp</center></h2> * ****************************************************************************** */ /* Define to prevent recursive inclusion -------------------------------------*/ #ifndef RTE_FLASH_ACCESS_H #define RTE_FLASH_ACCESS_H #ifdef __cplusplus extern "C" { #endif /* Includes ------------------------------------------------------------------*/ #include "stm32f4xx_hal.h" /* Exported variables --------------------------------------------------------*/ /* Exported types ------------------------------------------------------------*/ enum { BFA_OK = 0, //= HAL_OK BFA_ERROR = (uint8_t)HAL_ERROR, BFA_BUSY = (uint8_t)HAL_BUSY, BFA_TIMEOUT = (uint8_t)HAL_TIMEOUT, BFA_EMPTY, }; /* Exported functions --------------------------------------------------------*/ uint8_t BFA_readLastDataBlock(uint32_t *dataArray4); uint8_t BFA_writeDataBlock(const uint32_t *dataArray4); #ifdef __cplusplus } #endif #endif /* RTE_FLASH_ACCESS_H */ /************************ (C) COPYRIGHT heinrichs weikamp *****END OF FILE****/