BMP280_I2C.cpp

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/**
 * @file bmp280_spi.cpp
 *
 * SPI interface for BMP280
 */

#include "bmp280.h"

#include <px4_platform_common/px4_config.h>
#include <drivers/device/i2c.h>

#if defined(PX4_I2C_OBDEV_BMP280) || defined(PX4_I2C_EXT_OBDEV_BMP280)

class BMP280_I2C: public device::I2C, public bmp280::IBMP280
{
public:
    BMP280_I2C(uint8_t bus, uint32_t device);
    virtual ~BMP280_I2C() override = default;

    int init() override { return I2C::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::I2C::get_device_id(); }

private:
    bmp280::calibration_s   _cal{};
    bmp280::data_s      _data{};
};

bmp280::IBMP280 *bmp280_i2c_interface(uint8_t busnum, uint32_t device)
{
    return new BMP280_I2C(busnum, device);
}

BMP280_I2C::BMP280_I2C(uint8_t bus, uint32_t device) :
    I2C("BMP280_I2C", nullptr, bus, device, 100 * 1000)
{
}

uint8_t
BMP280_I2C::get_reg(uint8_t addr)
{
    uint8_t cmd[2] = { (uint8_t)(addr), 0};
    transfer(&cmd[0], 1, &cmd[1], 1);

    return cmd[1];
}

int
BMP280_I2C::set_reg(uint8_t value, uint8_t addr)
{
    uint8_t cmd[2] = { (uint8_t)(addr), value};
    return transfer(cmd, sizeof(cmd), nullptr, 0);
}

bmp280::data_s *
BMP280_I2C::get_data(uint8_t addr)
{
    const uint8_t cmd = addr;

    if (transfer(&cmd, sizeof(cmd), (uint8_t *)&_data, sizeof(bmp280::data_s)) == OK) {
        return (&_data);

    } else {
        return nullptr;
    }
}

bmp280::calibration_s *
BMP280_I2C::get_calibration(uint8_t addr)
{
    const uint8_t cmd = addr;

    if (transfer(&cmd, sizeof(cmd), (uint8_t *)&_cal, sizeof(bmp280::calibration_s)) == OK) {
        return &(_cal);

    } else {
        return nullptr;
    }
}

#endif /* PX4_I2C_OBDEV_BMP280 || PX4_I2C_EXT_OBDEV_BMP280 */