BMP280_SPI.cpp
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/****************************************************************************
*
* Copyright (c) 2016-2019 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 bmp280_spi.cpp
*
* SPI interface for BMP280
*/
#include "bmp280.h"
#include <px4_platform_common/px4_config.h>
#include <drivers/device/spi.h>
/* SPI protocol address bits */
#define DIR_READ (1<<7) //for set
#define DIR_WRITE ~(1<<7) //for clear
#pragma pack(push,1)
struct spi_data_s {
uint8_t addr;
struct bmp280::data_s data;
};
struct spi_calibration_s {
uint8_t addr;
struct bmp280::calibration_s cal;
};
#pragma pack(pop)
class BMP280_SPI: public device::SPI, public bmp280::IBMP280
{
public:
BMP280_SPI(uint8_t bus, uint32_t device, int bus_frequency, spi_mode_e spi_mode);
virtual ~BMP280_SPI() override = default;
int init() override { return SPI::init(); }
uint8_t get_reg(uint8_t addr) override;
int set_reg(uint8_t value, uint8_t addr) override;
bmp280::data_s *get_data(uint8_t addr) override;
bmp280::calibration_s *get_calibration(uint8_t addr) override;
uint32_t get_device_id() const override { return device::SPI::get_device_id(); }
uint8_t get_device_address() const override { return device::SPI::get_device_address(); }
private:
spi_calibration_s _cal{};
spi_data_s _data{};
};
bmp280::IBMP280 *
bmp280_spi_interface(uint8_t busnum, uint32_t device, int bus_frequency, spi_mode_e spi_mode)
{
return new BMP280_SPI(busnum, device, bus_frequency, spi_mode);
}
BMP280_SPI::BMP280_SPI(uint8_t bus, uint32_t device, int bus_frequency, spi_mode_e spi_mode) :
SPI(DRV_BARO_DEVTYPE_BMP280, MODULE_NAME, bus, device, spi_mode, bus_frequency)
{
}
uint8_t
BMP280_SPI::get_reg(uint8_t addr)
{
uint8_t cmd[2] = { (uint8_t)(addr | DIR_READ), 0}; // set MSB bit
transfer(&cmd[0], &cmd[0], 2);
return cmd[1];
}
int
BMP280_SPI::set_reg(uint8_t value, uint8_t addr)
{
uint8_t cmd[2] = { (uint8_t)(addr & DIR_WRITE), value}; // clear MSB bit
return transfer(&cmd[0], nullptr, 2);
}
bmp280::data_s *
BMP280_SPI::get_data(uint8_t addr)
{
_data.addr = (uint8_t)(addr | DIR_READ); // set MSB bit
if (transfer((uint8_t *)&_data, (uint8_t *)&_data, sizeof(spi_data_s)) == OK) {
return &(_data.data);
} else {
return nullptr;
}
}
bmp280::calibration_s *
BMP280_SPI::get_calibration(uint8_t addr)
{
_cal.addr = addr | DIR_READ;
if (transfer((uint8_t *)&_cal, (uint8_t *)&_cal, sizeof(spi_calibration_s)) == OK) {
return &(_cal.cal);
} else {
return nullptr;
}
}