LPS22HB_SPI.cpp
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/****************************************************************************
*
* Copyright (c) 2018 PX4 Development Team. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name PX4 nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/**
* @file LPS22HB_SPI.cpp
*
* SPI interface for LPS22HB
*/
#include "LPS22HB.hpp"
#include <drivers/device/spi.h>
/* SPI protocol address bits */
#define DIR_READ (1<<7)
#define DIR_WRITE (0<<7)
device::Device *LPS22HB_SPI_interface(int bus, uint32_t devid, int bus_frequency, spi_mode_e spi_mode);
class LPS22HB_SPI : public device::SPI
{
public:
LPS22HB_SPI(int bus, uint32_t device, int bus_frequency, spi_mode_e spi_mode);
~LPS22HB_SPI() override = default;
int read(unsigned address, void *data, unsigned count) override;
int write(unsigned address, void *data, unsigned count) override;
protected:
int probe() override;
};
device::Device *
LPS22HB_SPI_interface(int bus, uint32_t devid, int bus_frequency, spi_mode_e spi_mode)
{
return new LPS22HB_SPI(bus, devid, bus_frequency, spi_mode);
}
LPS22HB_SPI::LPS22HB_SPI(int bus, uint32_t device, int bus_frequency, spi_mode_e spi_mode) :
SPI(DRV_BARO_DEVTYPE_LPS22HB, MODULE_NAME, bus, device, spi_mode, bus_frequency)
{
}
int LPS22HB_SPI::probe()
{
// read WHO_AM_I value
uint8_t id = 0;
if (read(WHO_AM_I, &id, 1)) {
DEVICE_DEBUG("read_reg fail");
return -EIO;
}
if (id != LPS22HB_ID_WHO_AM_I) {
DEVICE_DEBUG("ID byte mismatch (%02x != %02x)", LPS22HB_ID_WHO_AM_I, id);
return -EIO;
}
return PX4_OK;
}
int LPS22HB_SPI::write(unsigned address, void *data, unsigned count)
{
uint8_t buf[32];
if (sizeof(buf) < (count + 1)) {
return -EIO;
}
buf[0] = address | DIR_WRITE;
memcpy(&buf[1], data, count);
return transfer(&buf[0], &buf[0], count + 1);
}
int LPS22HB_SPI::read(unsigned address, void *data, unsigned count)
{
uint8_t buf[32];
if (sizeof(buf) < (count + 1)) {
return -EIO;
}
buf[0] = address | DIR_READ;
int ret = transfer(&buf[0], &buf[0], count + 1);
memcpy(data, &buf[1], count);
return ret;
}