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Add Read Cache and Stats

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- baro.cache_ttl_ms avoids multiple reads
- by default, cache is off (cache_ttl_ms=0)
- stats are updated (similar to how prometheus-sensors does this)
This commit is contained in:
Pim van Pelt
2018-04-21 15:39:57 +02:00
parent 89ec34dc1d
commit 9d9cd1d00a
5 changed files with 57 additions and 1 deletions
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18
include/mgos_barometer.h
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@ -30,11 +30,23 @@ enum mgos_barometer_type {
struct mgos_barometer;
struct mgos_barometer_stats {
double last_read_time; // value of mg_time() upon last call to _read()
uint32_t read; // calls to _read()
uint32_t read_success; // successful _read()
uint32_t read_success_cached; // calls to _read() which were cached
// Note: read_errors := read - read_success - read_success_cached
double read_success_usecs; // time spent in successful uncached _read()
};
struct mgos_barometer *mgos_barometer_create_i2c(struct mgos_i2c *i2c, uint8_t i2caddr, enum mgos_barometer_type type);
void mgos_barometer_destroy(struct mgos_barometer **sensor);
bool mgos_barometer_has_thermometer(struct mgos_barometer *sensor);
bool mgos_barometer_has_barometer(struct mgos_barometer *sensor);
/* Set cache TTL -- will limit reads and return cached data. Set msecs=0 to turn off */
bool mgos_barometer_set_cache_ttl(struct mgos_barometer *sensor, uint16_t msecs);
/* Read all available sensor data from the IMU */
bool mgos_barometer_read(struct mgos_barometer *sensor);
@ -44,6 +56,12 @@ bool mgos_barometer_get_pressure(struct mgos_barometer *sensor, float *p);
/* Return temperature data in units of Celcius */
bool mgos_barometer_get_temperature(struct mgos_barometer *sensor, float *t);
/*
* Return statistics on the sensor.
*/
bool mgos_barometer_get_stats(struct mgos_barometer *sensor, struct mgos_barometer_stats *stats);
/*
* Initialization function for MGOS -- currently a noop.
*/