meteo_stick_calib.h File Reference

Parser for calibration data coming from 25AA256 EEPROM of the Meteo Stick. More...

#include <stdint.h>
#include <stdbool.h>
#include <stddef.h>
#include <time.h>

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Data Structures
struct	Sensors_params
	Calibration_params structure initialized with calibvration data read from meteostick eeprom. More...
struct	Calibration_params

Macros
#define	MTOSTK_MAX_SEEK_ARRAY_SIZE   20
#define	MTOSTK_MAX_POLY_ARRAY_SIZE   6
#define	MTOSTK_MAX_TEMP_ARRAY_SIZE   6
#define	UUID_LEN   13

Typedefs
typedef uint32_t	mtostk_time_t
	time in seconds since 01/01/1970 More...

Enumerations
enum	Mtostk_sensors {   MTOSTK_TEMP = 0, MTOSTK_ABS_PRESS, MTOSTK_DIF_PRESS, MTOSTK_HUMIDITY,   MTOSTK_NUM_SENSORS }

Functions
bool	mtostk_populate_cal_from_buffer (Calibration_params *cp, uint8_t *eeprom_buffer)
	Initializes a Calibration_params structure from memory buffer. More...
float	mtostk_get_calibrated_value (Calibration_params *cp, Mtostk_sensors type, float uncal, float temp)
	get calibrated value for a sensor according to current temperature More...

Detailed Description

Parser for calibration data coming from 25AA256 EEPROM of the Meteo Stick.

Definition in file meteo_stick_calib.h.

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Data Structure Documentation

struct Sensors_params

Calibration_params structure initialized with calibvration data read from meteostick eeprom.

Definition at line 73 of file meteo_stick_calib.h.

Data Fields
float	coeffs[MTOSTK_MAX_TEMP_ARRAY_SIZE][MTOSTK_MAX_POLY_ARRAY_SIZE]
uint16_t	num_coeff
uint16_t	num_temp
float	temps[MTOSTK_MAX_TEMP_ARRAY_SIZE]
mtostk_time_t	timestamp

struct Calibration_params

Definition at line 81 of file meteo_stick_calib.h.

Collaboration diagram for Calibration_params:

Data Fields
Sensors_params	params[MTOSTK_NUM_SENSORS]
char	uuid[13]

Macro Definition Documentation

#define MTOSTK_MAX_POLY_ARRAY_SIZE   6

Definition at line 39 of file meteo_stick_calib.h.

Referenced by mtostk_populate_float_array_from_buffer().

#define MTOSTK_MAX_SEEK_ARRAY_SIZE   20

Definition at line 38 of file meteo_stick_calib.h.

Referenced by mtostk_seek_array_buffer().

#define MTOSTK_MAX_TEMP_ARRAY_SIZE   6

Definition at line 40 of file meteo_stick_calib.h.

Referenced by mtostk_populate_float_array_from_buffer(), and mtostk_seek_array_buffer().

#define UUID_LEN   13

Definition at line 41 of file meteo_stick_calib.h.

Referenced by mtostk_populate_uuid_from_buffer().

Typedef Documentation

mtostk_time_t

time in seconds since 01/01/1970

we don't use libc time_t because it can be a 64 bits type to avoid Y2038 bug we instead keep a 32 bits type but unsigned. We don't care date before 1970, and 4e9 seconds since 1/1/70 make us bug free until 2100

Definition at line 61 of file meteo_stick_calib.h.

Enumeration Type Documentation

enum Mtostk_sensors

Enumerator
MTOSTK_TEMP
MTOSTK_ABS_PRESS
MTOSTK_DIF_PRESS
MTOSTK_HUMIDITY
MTOSTK_NUM_SENSORS

Definition at line 43 of file meteo_stick_calib.h.

Function Documentation

float mtostk_get_calibrated_value	(	Calibration_params *	cp,
		Mtostk_sensors	type,
		float	uncal,
		float	temp
	)

get calibrated value for a sensor according to current temperature

Parameters

[in]	cp	pointer to calibration structure
[in]	type	sensor type
[in]	uncal	uncalibrated value
[in]	temp	current temperature (not relevant for calibration of temperature sensor)

Returns

calibrated value

Definition at line 71 of file meteo_stick_calib.c.

References Sensors_params::coeffs, mtostk_apply_polynomial(), mtostk_apply_polynomial_temp(), MTOSTK_NUM_SENSORS, MTOSTK_TEMP, Sensors_params::num_coeff, Sensors_params::num_temp, Calibration_params::params, and Sensors_params::timestamp.

Referenced by get_diff(), get_humidity(), get_pressure(), and get_temp().

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bool mtostk_populate_cal_from_buffer	(	Calibration_params *	cp,
		uint8_t *	eeprom_buffer
	)

Initializes a Calibration_params structure from memory buffer.

Precondition

the memory buffer must be initialized with data read from the spi eeprom embeded on the meteostick

Parameters

[out]	cp	pointer to the Calibration_params structure to be initialized
[in]	eeprom_buffer	pointer to word aligned buffer of bytes

Definition at line 53 of file meteo_stick_calib.c.

References MTOSTK_NUM_SENSORS, mtostk_populate_sensor_from_buffer(), mtostk_populate_uuid_from_buffer(), MTOSTK_TEMP, Calibration_params::params, and Calibration_params::uuid.

Referenced by meteo_stick_periodic().

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