Airspeed sensor module using the MS45xxDO digital pressure sensor via I2C. More...

#include "std.h"
#include "mcu_periph/i2c.h"
#include "modules/sensors/airspeed_ms45xx_i2c.h"
#include "filters/low_pass_filter.h"
#include "modules/core/abi.h"
#include "mcu_periph/uart.h"
#include "pprzlink/messages.h"
#include "modules/datalink/downlink.h"
#include "modules/datalink/telemetry.h"

Include dependency graph for airspeed_ms45xx_i2c.c:

Go to the source code of this file.

Macros
#define	AIRSPEED_MS45XX_SEND_ABI true

#define	MS45XX_I2C_DEV i2c2
	Default I2C device. More...

#define	MS45XX_I2C_ADDR 0x50
	Sensor I2C slave address (existing defaults 0x50, 0x6C and 0x8C) More...

#define	MS45XX_PRESSURE_OUTPUT_TYPE_InH2O 0
	MS45xx sensors pressure output type can be in PSI or InH2O, as defined in the datasheet if not defined to be MS45XX_PRESSURE_OUTPUT_TYPE_InH2O then PSI is used. More...

#define	MS45XX_PRESSURE_RANGE 1
	MS45xx pressure range in PSI or InH2O The sensor is available in many ranges, the datasheet of your pressure sensor will tell which one and what this range represents. More...

#define	MS45XX_PRESSURE_TYPE 0
	Pressure Type 0 = Differential, 1 = Gauge note there are theoretical more types than 2, e.g. More...

#define	USE_AIRSPEED_LOWPASS_FILTER TRUE
	Use low pass filter on pressure values. More...

#define	MS45XX_OUTPUT_TYPE 0
	MS45xx output Type. More...

#define	InH2O_TO_PA 249.08891
	Conversion factor from InH2O to Pa. More...

#define	PSI_TO_PA 6894.75729
	Conversion factor from psi to Pa. More...

#define	OutputPressureToPa PSI_TO_PA

#define	MS45XX_PRESSURE_SCALE (2 * MS45XX_PRESSURE_RANGE / (0.8 * 16383) * OutputPressureToPa)

#define	MS45XX_PRESSURE_OFFSET (16383 / 2)

#define	MS45XX_RHO_DIV_2 1.6327
	Quadratic scale factor for indicated airspeed. More...

#define	MS45XX_LOWPASS_TAU 0.15
	Time constant for second order Butterworth low pass filter Default of 0.15 should give cut-off freq of 1/(2pitau) ~= 1Hz. More...

#define	AUTOSET_NB_MAX 200

Functions
static void	ms45xx_downlink (struct transport_tx trans, struct link_device dev)

void	ms45xx_i2c_init (void)

void	airspeed_ms45xx_i2c_change_tau (float new_tau)

void	ms45xx_i2c_periodic (void)

void	ms45xx_i2c_event (void)

Variables
struct AirspeedMs45xx	ms45xx

static struct i2c_transaction	ms45xx_trans

static Butterworth2LowPass	ms45xx_filter

Detailed Description

Airspeed sensor module using the MS45xxDO digital pressure sensor via I2C.

Needs to be one of the versions with 14bit pressure and 11bit temperature.

Definition in file airspeed_ms45xx_i2c.c.

Macro Definition Documentation

◆ AIRSPEED_MS45XX_SEND_ABI

#define AIRSPEED_MS45XX_SEND_ABI true

Definition at line 44 of file airspeed_ms45xx_i2c.c.

◆ AUTOSET_NB_MAX

#define AUTOSET_NB_MAX 200

Definition at line 242 of file airspeed_ms45xx_i2c.c.

◆ InH2O_TO_PA

#define InH2O_TO_PA 249.08891

Conversion factor from InH2O to Pa.

Definition at line 95 of file airspeed_ms45xx_i2c.c.

◆ MS45XX_I2C_ADDR

#define MS45XX_I2C_ADDR 0x50

Sensor I2C slave address (existing defaults 0x50, 0x6C and 0x8C)

Definition at line 56 of file airspeed_ms45xx_i2c.c.

◆ MS45XX_I2C_DEV

#define MS45XX_I2C_DEV i2c2

Default I2C device.

Definition at line 50 of file airspeed_ms45xx_i2c.c.

◆ MS45XX_LOWPASS_TAU

#define MS45XX_LOWPASS_TAU 0.15

Time constant for second order Butterworth low pass filter Default of 0.15 should give cut-off freq of 1/(2*pi*tau) ~= 1Hz.

Definition at line 158 of file airspeed_ms45xx_i2c.c.

◆ MS45XX_OUTPUT_TYPE

#define MS45XX_OUTPUT_TYPE 0

MS45xx output Type.

0 = Output Type A with 10% to 90% 1 = Output Type B with 5% to 95%

Definition at line 91 of file airspeed_ms45xx_i2c.c.

◆ MS45XX_PRESSURE_OFFSET

#define MS45XX_PRESSURE_OFFSET (16383 / 2)

Definition at line 121 of file airspeed_ms45xx_i2c.c.

◆ MS45XX_PRESSURE_OUTPUT_TYPE_InH2O

#define MS45XX_PRESSURE_OUTPUT_TYPE_InH2O 0

MS45xx sensors pressure output type can be in PSI or InH2O, as defined in the datasheet if not defined to be MS45XX_PRESSURE_OUTPUT_TYPE_InH2O then PSI is used.

Definition at line 63 of file airspeed_ms45xx_i2c.c.

◆ MS45XX_PRESSURE_RANGE

#define MS45XX_PRESSURE_RANGE 1

MS45xx pressure range in PSI or InH2O The sensor is available in many ranges, the datasheet of your pressure sensor will tell which one and what this range represents.

Definition at line 71 of file airspeed_ms45xx_i2c.c.