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VPM-B: add vpm-b based deco checking.

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Check during the trial_ascent() if existing pressure gradient is
smaller than previously calculated max gradient. If not, ascent
is impossible from the vpm-b's point of view.

Signed-off-by: Jan Darowski <jan.darowski@gmail.com>
This commit is contained in:
Jan Darowski 2015-07-03 23:24:20 +02:00
parent fad592e43a
commit e7aa686f16
3 changed files with 21 additions and 1 deletions
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15
deco.c
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@ -210,6 +210,21 @@ double he_factor(int period_in_seconds, int ci)
return cache[ci].last_factor; return cache[ci].last_factor;
} }
bool is_vpmb_ok(double pressure)
{
int ci;
double gradient;
double gas_tension;
for (ci = 0; ci < 16; ++ci) {
gas_tension = tissue_n2_sat[ci] + tissue_he_sat[ci] + vpmb_config.other_gases_pressure;
gradient = gas_tension - pressure;
if (gradient > total_gradient[ci])
return false;
}
return true;
}
void vpmb_start_gradient() void vpmb_start_gradient()
{ {
int ci; int ci;

1
dive.h
View file

@ -785,6 +785,7 @@ extern void cache_deco_state(double, char **datap);
extern double restore_deco_state(char *data); extern double restore_deco_state(char *data);
extern void nuclear_regeneration(double time); extern void nuclear_regeneration(double time);
extern void vpmb_start_gradient(); extern void vpmb_start_gradient();
extern bool is_vpmb_ok(double pressure);
/* this should be converted to use our types */ /* this should be converted to use our types */
struct divedatapoint { struct divedatapoint {

6
planner.c
View file

@ -836,11 +836,15 @@ bool trial_ascent(int trial_depth, int stoplevel, int avg_depth, int bottom_time
tissue_tolerance = add_segment(depth_to_mbar(trial_depth, &displayed_dive) / 1000.0, tissue_tolerance = add_segment(depth_to_mbar(trial_depth, &displayed_dive) / 1000.0,
gasmix, gasmix,
TIMESTEP, po2, &displayed_dive, prefs.decosac); TIMESTEP, po2, &displayed_dive, prefs.decosac);
if (deco_allowed_depth(tissue_tolerance, surface_pressure, &displayed_dive, 1) > trial_depth - deltad) { if (prefs.deco_mode != VPMB && deco_allowed_depth(tissue_tolerance, surface_pressure, &displayed_dive, 1) > trial_depth - deltad) {
/* We should have stopped */ /* We should have stopped */
clear_to_ascend = false; clear_to_ascend = false;
break; break;
} }
if (prefs.deco_mode == VPMB && (!is_vpmb_ok(depth_to_mbar(trial_depth, &displayed_dive) / 1000.0))){
clear_to_ascend = false;
break;
}
trial_depth -= deltad; trial_depth -= deltad;
} }
restore_deco_state(trial_cache); restore_deco_state(trial_cache);