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Add function to calculate gas maximum narcotic depth

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Signed-off-by: Rick Walsh <rickmwalsh@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Rick Walsh 2016-07-06 22:40:31 +10:00 • committed by Dirk Hohndel
parent 1ba61d7ad5
commit 9fbd11744f
6 changed files with 20 additions and 9 deletions
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11
core/dive.h
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@ -481,6 +481,17 @@ static inline depth_t gas_mod(struct gasmix *mix, pressure_t po2_limit, struct d
return rounded_depth;
}
/* Maximum narcotic depth rounded to multiples of roundto mm */
static inline depth_t gas_mnd(struct gasmix *mix, depth_t end, struct dive *dive, int roundto) {
depth_t rounded_depth;
pressure_t ppo2n2;
ppo2n2.mbar = depth_to_mbar(end.mm, dive);
double maxambient = ppo2n2.mbar / (1 - get_he(mix) / 1000.0);
rounded_depth.mm = rint(mbar_to_depth(maxambient, dive) / roundto) * roundto;
return rounded_depth;
}
#define SURFACE_THRESHOLD 750 /* somewhat arbitrary: only below 75cm is it really diving */
/* this is a global spot for a temporary dive structure that we use to