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view Documentations/dump-disc.cfg @ 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 | 01cc5959f199 |
children |
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#! openocd -f # Define the prob used: source [find interface/stlink-v2.cfg] set WORKAREASIZE 0x8000 transport select hla_swd # Reset options set ENABLE_LOW_POWER 1 set STOP_WATCHDOG 1 reset_config srst_only srst_nogate connect_assert_srst # Seelct the right chip set CHIPNAME stm32f427IIT6 set CONNECT_UNDER_RESET 1 source [find target/stm32f4x.cfg] # Allow to continue execution after a connection: init_reset run puts "Flash banks:" flash banks #puts "Reading FIRMWARE..." # Requires OpenOCD 0.10.0 / released January 2017 ? #flash dump_image CPU1-DISC-dump.hex 0x00000000 0x8000 #puts "Done." exit