pios_etasv3.c

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/* 
 * 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, see <http://www.gnu.org/licenses/>
 */

/* Project Includes */
#include "pios.h"

#if defined(PIOS_INCLUDE_ETASV3)

#include "pios_etasv3.h"

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 */