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7c62f7541c
Both the calculations for CNS and OTU did not take into account the pO2 drop when using a PSCR. Furthermore, there was some unit confusion due to not using internal units. Reported-by: arosl Signed-off-by: Robert C. Helling <helling@atdotde.de>
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#ifndef GAS_H
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#define GAS_H
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#include "divemode.h"
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#include "units.h"
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#ifdef __cplusplus
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extern "C" {
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#else
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#include <stdbool.h>
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#endif
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enum gas_component { N2, HE, O2 };
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// o2 == 0 && he == 0 -> air
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// o2 < 0 -> invalid
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struct gasmix {
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fraction_t o2;
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fraction_t he;
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};
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static const struct gasmix gasmix_invalid = { { -1 }, { -1 } };
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static const struct gasmix gasmix_air = { { 0 }, { 0 } };
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enum gastype {
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GASTYPE_AIR,
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GASTYPE_NITROX,
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GASTYPE_HYPOXIC_TRIMIX,
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GASTYPE_NORMOXIC_TRIMIX,
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GASTYPE_HYPEROXIC_TRIMIX,
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GASTYPE_OXYGEN,
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GASTYPE_COUNT
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};
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struct icd_data { // This structure provides communication between function isobaric_counterdiffusion() and the calling software.
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int dN2; // The change in fraction (permille) of nitrogen during the change
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int dHe; // The change in fraction (permille) of helium during the change
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};
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extern bool isobaric_counterdiffusion(struct gasmix oldgasmix, struct gasmix newgasmix, struct icd_data *results);
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extern double gas_compressibility_factor(struct gasmix gas, double bar);
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extern double isothermal_pressure(struct gasmix gas, double p1, int volume1, int volume2);
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extern double gas_density(struct gasmix gas, int pressure);
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extern int same_gasmix(struct gasmix a, struct gasmix b);
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static inline int get_o2(struct gasmix mix)
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{
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return mix.o2.permille ?: O2_IN_AIR;
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}
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static inline int get_he(struct gasmix mix)
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{
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return mix.he.permille;
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}
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static inline int get_n2(struct gasmix mix)
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{
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return 1000 - get_o2(mix) - get_he(mix);
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}
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int pscr_o2(const double amb_pressure, struct gasmix mix);
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struct gas_pressures {
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double o2, n2, he;
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};
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extern void sanitize_gasmix(struct gasmix *mix);
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extern int gasmix_distance(struct gasmix a, struct gasmix b);
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extern fraction_t get_gas_component_fraction(struct gasmix mix, enum gas_component component);
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extern void fill_pressures(struct gas_pressures *pressures, double amb_pressure, struct gasmix mix, double po2, enum divemode_t dctype);
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extern bool gasmix_is_air(struct gasmix gasmix);
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extern bool gasmix_is_invalid(struct gasmix mix);
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extern enum gastype gasmix_to_type(struct gasmix mix);
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extern const char *gastype_name(enum gastype type);
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#ifdef __cplusplus
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}
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#endif
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#endif
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