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core: add a special NO_SENSOR value for sample::sensor

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The sensor member of sample refers to a cylinder from which
the pressure was read. However, some dives don't even have
a cylinder. Therefore, introduce a special NO_SENSOR value
for these dives. Since the cylinder is given as a uint8_t,
0xff seems to be a sensible choice.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-07-18 22:26:38 +02:00 • committed by Dirk Hohndel
parent 48c2929f48
commit 7e11a35371
3 changed files with 8 additions and 5 deletions
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4
core/sample.h
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@ -9,6 +9,8 @@ extern "C" {
#endif
#define MAX_SENSORS 2
#define NO_SENSOR ((uint8_t)-1)
struct sample // BASE TYPE BYTES UNITS RANGE DESCRIPTION
{ // --------- ----- ----- ----- -----------
duration_t time; // int32_t 4 seconds (0-34 yrs) elapsed dive time up to this sample
@ -23,7 +25,7 @@ struct sample // BASE TYPE BYTES UNITS RANGE
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)
bearing_t bearing; // int16_t 2 degrees (-1 no val, 0-360 deg) compass bearing
uint8_t sensor[MAX_SENSORS]; // uint8_t 1 sensorID (0-255) ID of cylinder pressure sensor
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
uint8_t heartbeat; // uint8_t 1 beats/m (0-255) heart rate measurement
volume_t sac; // 4 ml/min predefined SAC