diff options
Diffstat (limited to 'dive.c')
| -rw-r--r-- | dive.c | 23 |
1 files changed, 23 insertions, 0 deletions
@@ -1454,6 +1454,29 @@ int gasmix_distance(const struct gasmix *a, const struct gasmix *b) return delta_he + delta_o2; } +/* Compute partial gas pressures in bar from gasmix and ambient pressures, possibly for OC or CCR, to be extended to PSCT */ +extern void fill_pressures(struct gas_pressures *pressures, const double amb_pressure, const struct gasmix *mix, double po2, const enum dive_comp_type type) +{ + if (po2) { + /* we have an O₂ partial pressure in the sample - so this + * is likely a CC dive... use that instead of the value + * from the cylinder info */ + if (po2 >= amb_pressure || get_o2(mix) == 1000) { + pressures->o2 = amb_pressure; + pressures->he = 0; + pressures->n2 = 0; + } else { + pressures->he = (amb_pressure - pressures->o2) * (double)get_he(mix) / (1000 - get_o2(mix)); + pressures->n2 = amb_pressure - pressures->o2 - pressures->he; + } + } else { + pressures->o2 = get_o2(mix) / 1000.0 * amb_pressure; + pressures->he = get_he(mix) / 1000.0 * amb_pressure; + pressures->n2 = (1000 - get_o2(mix) - get_he(mix)) / 1000.0 * amb_pressure; + } + +} + static int find_cylinder_match(cylinder_t *cyl, cylinder_t array[], unsigned int used) { int i; |