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135 lines
4.0 KiB
C++
135 lines
4.0 KiB
C++
/****************************************************************************
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*
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* Copyright (c) 2016-2019 PX4 Development Team. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name PX4 nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/**
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* @file bmp280_spi.cpp
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*
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* SPI interface for BMP280
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*/
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#include "bmp280.h"
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#include <px4_platform_common/px4_config.h>
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#include <drivers/device/spi.h>
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/* SPI protocol address bits */
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#define DIR_READ (1<<7) //for set
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#define DIR_WRITE ~(1<<7) //for clear
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#pragma pack(push,1)
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struct spi_data_s {
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uint8_t addr;
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struct bmp280::data_s data;
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};
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struct spi_calibration_s {
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uint8_t addr;
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struct bmp280::calibration_s cal;
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};
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#pragma pack(pop)
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class BMP280_SPI: public device::SPI, public bmp280::IBMP280
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{
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public:
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BMP280_SPI(uint8_t bus, uint32_t device, int bus_frequency, spi_mode_e spi_mode);
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virtual ~BMP280_SPI() override = default;
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int init() override { return SPI::init(); }
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uint8_t get_reg(uint8_t addr) override;
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int set_reg(uint8_t value, uint8_t addr) override;
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bmp280::data_s *get_data(uint8_t addr) override;
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bmp280::calibration_s *get_calibration(uint8_t addr) override;
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uint32_t get_device_id() const override { return device::SPI::get_device_id(); }
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uint8_t get_device_address() const override { return device::SPI::get_device_address(); }
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private:
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spi_calibration_s _cal{};
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spi_data_s _data{};
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};
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bmp280::IBMP280 *
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bmp280_spi_interface(uint8_t busnum, uint32_t device, int bus_frequency, spi_mode_e spi_mode)
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{
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return new BMP280_SPI(busnum, device, bus_frequency, spi_mode);
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}
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BMP280_SPI::BMP280_SPI(uint8_t bus, uint32_t device, int bus_frequency, spi_mode_e spi_mode) :
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SPI("BMP280_SPI", nullptr, bus, device, spi_mode, bus_frequency)
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{
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}
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uint8_t
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BMP280_SPI::get_reg(uint8_t addr)
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{
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uint8_t cmd[2] = { (uint8_t)(addr | DIR_READ), 0}; // set MSB bit
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transfer(&cmd[0], &cmd[0], 2);
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return cmd[1];
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}
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int
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BMP280_SPI::set_reg(uint8_t value, uint8_t addr)
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{
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uint8_t cmd[2] = { (uint8_t)(addr & DIR_WRITE), value}; // clear MSB bit
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return transfer(&cmd[0], nullptr, 2);
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}
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bmp280::data_s *
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BMP280_SPI::get_data(uint8_t addr)
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{
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_data.addr = (uint8_t)(addr | DIR_READ); // set MSB bit
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if (transfer((uint8_t *)&_data, (uint8_t *)&_data, sizeof(spi_data_s)) == OK) {
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return &(_data.data);
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} else {
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return nullptr;
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}
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}
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bmp280::calibration_s *
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BMP280_SPI::get_calibration(uint8_t addr)
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{
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_cal.addr = addr | DIR_READ;
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if (transfer((uint8_t *)&_cal, (uint8_t *)&_cal, sizeof(spi_calibration_s)) == OK) {
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return &(_cal.cal);
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} else {
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return nullptr;
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}
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}
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