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LibrePilot/flight/pios/common/pios_etasv3.c

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/**
******************************************************************************
* @addtogroup PIOS PIOS Core hardware abstraction layer
* @{
* @addtogroup PIOS_ETASV3 ETASV3 Functions
* @brief Hardware functions to deal with the Eagle Tree Airspeed MicroSensor V3
* @{
*
* @file pios_etasv3.c
* @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
*/
#include "pios.h"
#ifdef PIOS_INCLUDE_ETASV3
static bool PIOS_ETASV3_Read(uint8_t *buffer, uint8_t len)
{
const struct pios_i2c_txn txn_list[] = {
{
.info = __func__,
.addr = ETASV3_I2C_ADDR,
.rw = PIOS_I2C_TXN_READ,
.len = len,
.buf = buffer,
}
};
return PIOS_I2C_Transfer(PIOS_I2C_ETASV3_ADAPTER, txn_list, NELEMENTS(txn_list));
}
int16_t PIOS_ETASV3_ReadAirspeed(void)
{
uint8_t airspeed_raw[2];
if (PIOS_ETASV3_Read(airspeed_raw, sizeof(airspeed_raw)) != 0) {
/* Failed to read airspeed */
return -1;
}
return airspeed_raw[0] | (airspeed_raw[1] << 8);
}
#endif /* PIOS_INCLUDE_ETASV3 */