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VPM-B: Calculate first_stop_pressure before starting ascent

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The Boyle's law compensation depends on first_stop_pressure.  To produce
profiles similar to other VPM-B implementations, we should calculate it as the
ceiling before starting the ascent.

Commit 159c9eb2c1, Compare ceiling to next stop
rather than try to ascent for VPM-B, changed (VPM-B) to consider the current
ceiling rather than an incremental ascent between one stop level and the next.
However, the initial ascent generally steps through several stop levels, so
first_stop_pressure was still not calculated as the ceiling prior to commencing
the calculated ascent.

Signed-off-by: Rick Walsh <rickmwalsh@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Rick Walsh 2015-08-22 14:41:53 +10:00 committed by Dirk Hohndel
parent 898ea6acb5
commit 634e698664
1 changed files with 17 additions and 5 deletions
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22
planner.c
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@ -939,6 +939,7 @@ bool plan(struct diveplan *diveplan, char **cached_datap, bool is_planner, bool
int *decostoplevels;
int decostoplevelcount;
unsigned int *stoplevels = NULL;
int vpmb_first_stop;
bool stopping = false;
bool pendinggaschange = false;
bool clear_to_ascend;
@ -1100,6 +1101,22 @@ bool plan(struct diveplan *diveplan, char **cached_datap, bool is_planner, bool
bottom_gi = gi;
bottom_gas = gas;
bottom_stopidx = stopidx;
// Find first stop used for VPM-B Boyle's law compensation
if (prefs.deco_mode == VPMB) {
vpmb_first_stop = deco_allowed_depth(tissue_tolerance, diveplan->surface_pressure / 1000, &displayed_dive, 1);
if (vpmb_first_stop > 0) {
while (stoplevels[stopidx] > vpmb_first_stop) {
stopidx--;
}
stopidx++;
vpmb_first_stop = stoplevels[stopidx];
}
first_stop_pressure.mbar = depth_to_mbar(vpmb_first_stop, &displayed_dive);
} else {
first_stop_pressure.mbar = 0;
}
//CVA
do {
is_final_plan = (prefs.deco_mode == BUEHLMANN) || (previous_deco_time - deco_time < 10); // CVA time converges
@ -1119,7 +1136,6 @@ bool plan(struct diveplan *diveplan, char **cached_datap, bool is_planner, bool
breaktime = -1;
breakcylinder = 0;
o2time = 0;
first_stop_pressure.mbar = 0;
last_ascend_rate = ascent_velocity(depth, avg_depth, bottom_time);
if ((current_cylinder = get_gasidx(&displayed_dive, &gas)) == -1) {
report_error(translate("gettextFromC", "Can't find gas %s"), gasname(&gas));
@ -1160,8 +1176,6 @@ bool plan(struct diveplan *diveplan, char **cached_datap, bool is_planner, bool
stopping = true;
// Boyles Law compensation
if (first_stop_pressure.mbar == 0)
first_stop_pressure.mbar = depth_to_mbar(depth, &displayed_dive);
boyles_law(depth_to_mbar(stoplevels[stopidx], &displayed_dive) / 1000.0);
/* Check we need to change cylinder.
@ -1215,8 +1229,6 @@ bool plan(struct diveplan *diveplan, char **cached_datap, bool is_planner, bool
stopping = true;
// Boyles Law compensation
if (first_stop_pressure.mbar == 0)
first_stop_pressure.mbar = depth_to_mbar(depth, &displayed_dive);
boyles_law(depth_to_mbar(stoplevels[stopidx], &displayed_dive) / 1000.0);
}