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core: use int16_t for sensor-id

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The sensor-id in the sample struct was a uint8_t, with all
the known problems of unsigned integers. In the rest of the
code cylinder ids are signed integers. To avoid confusion,
make it a signed int. int8_t should be enough (max. 127
cylinders). To allow for degenerate cases, use an int16_t.
16k cylinders should be enough for everyone.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-07-20 12:28:34 +02:00 • committed by Dirk Hohndel
parent 8ac0519a99
commit 0c84f369c3
2 changed files with 9 additions and 9 deletions
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12
core/sample.h
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@ -9,7 +9,7 @@ extern "C" {
#endif
#define MAX_SENSORS 2
#define NO_SENSOR ((uint8_t)-1)
#define NO_SENSOR -1
struct sample // BASE TYPE BYTES UNITS RANGE DESCRIPTION
{ // --------- ----- ----- ----- -----------
@ -21,18 +21,18 @@ struct sample // BASE TYPE BYTES UNITS RANGE
depth_t depth; // int32_t 4 mm (0-2000 km) dive depth of this sample
depth_t stopdepth; // int32_t 4 mm (0-2000 km) depth of next deco stop
temperature_t temperature; // uint32_t 4 mK (0-4 MK) ambient temperature
pressure_t pressure[MAX_SENSORS]; // int32_t 4 mbar (0-2 Mbar) cylinder pressures (main and CCR o2)
pressure_t pressure[MAX_SENSORS]; // int32_t 2x4 mbar (0-2 Mbar) cylinder pressures (main and CCR o2)
o2pressure_t setpoint; // uint16_t 2 mbar (0-65 bar) O2 partial pressure (will be setpoint)
o2pressure_t o2sensor[3]; // uint16_t 6 mbar (0-65 bar) Up to 3 PO2 sensor values (rebreather)
o2pressure_t o2sensor[3]; // uint16_t 3x2 mbar (0-65 bar) Up to 3 PO2 sensor values (rebreather)
bearing_t bearing; // int16_t 2 degrees (-1 no val, 0-360 deg) compass bearing
uint8_t sensor[MAX_SENSORS]; // uint8_t 1 sensorID (0-254) ID of cylinder pressure sensor
uint16_t cns; // uint16_t 1 % (0-64k %) cns% accumulated
int16_t sensor[MAX_SENSORS]; // int16_t 2x2 sensorID (0-16k) ID of cylinder pressure sensor
uint16_t cns; // uint16_t 2 % (0-64k %) cns% accumulated
uint8_t heartbeat; // uint8_t 1 beats/m (0-255) heart rate measurement
volume_t sac; // 4 ml/min predefined SAC
bool in_deco; // bool 1 y/n y/n this sample is part of deco
bool manually_entered; // bool 1 y/n y/n this sample was entered by the user,
// not calculated when planning a dive
}; // Total size of structure: 57 bytes, excluding padding at end
}; // Total size of structure: 63 bytes, excluding padding at end
extern void add_sample_pressure(struct sample *sample, int sensor, int mbar);