LibrePilot/flight/pios/inc/pios_mpxv.h

/**
 ******************************************************************************
 * @addtogroup PIOS PIOS Core hardware abstraction layer
 * @{
 * @addtogroup PIOS_MPXV MPXV* Functions
 * @brief Hardware functions to deal with the DIYDrones airspeed kit, using MPXV5004, 7002 or similar
 * @{
 *
 * @file       pios_mpxv.h
 * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2012.
 * @brief      ETASV3 Airspeed Sensor Driver
 * @see        The GNU Public License (GPL) Version 3
 *
 ******************************************************************************/
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#ifndef PIOS_MPXV_H
#define PIOS_MPXV_H

typedef enum { PIOS_MPXV_UNKNOWN, PIOS_MPXV_5004, PIOS_MPXV_7002 } PIOS_MPXV_sensortype;
typedef struct {
    PIOS_MPXV_sensortype type;
    uint8_t  airspeedADCPin;
    uint16_t calibrationCount;
    uint32_t calibrationSum;
    uint16_t zeroPoint;
    float    scale;
    float    maxSpeed;
} PIOS_MPXV_descriptor;

#define PIOS_MPXV_5004_DESC(pin) \
    (PIOS_MPXV_descriptor) { \
        .type     = PIOS_MPXV_5004, \
        .airspeedADCPin = pin, \
        .maxSpeed = 80.0f, \
        .calibrationCount = 0, \
        .calibrationSum = 0, \
    }
#define PIOS_MPXV_7002_DESC(pin) \
    (PIOS_MPXV_descriptor) { \
        .type     = PIOS_MPXV_7002, \
        .airspeedADCPin = pin, \
        .maxSpeed = 56.0f, \
        .calibrationCount = 0, \
        .calibrationSum = 0, \
    }


uint16_t PIOS_MPXV_Measure(PIOS_MPXV_descriptor *desc);
uint16_t PIOS_MPXV_Calibrate(PIOS_MPXV_descriptor *desc, uint16_t measurement);
float PIOS_MPXV_CalcAirspeed(PIOS_MPXV_descriptor *desc, uint16_t measurement);

#endif /* PIOS_MPXV_H */