mirror of
https://gitee.com/mirrors_PX4/PX4-Autopilot.git
synced 2026-06-29 03:30:36 +08:00
Daniel Agar
139 lines
3.6 KiB
C++
139 lines
3.6 KiB
C++
/****************************************************************************
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*
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* Copyright (c) 2018 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 rm3100_i2c.cpp
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*
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* I2C interface for RM3100
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*/
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#include <px4_platform_common/px4_config.h>
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#include <assert.h>
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#include <debug.h>
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#include <errno.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <drivers/device/i2c.h>
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#include <drivers/drv_mag.h>
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#include <drivers/drv_device.h>
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#include "board_config.h"
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#include "rm3100.h"
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#define RM3100_ADDRESS 0x20
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class RM3100_I2C : public device::I2C
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{
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public:
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RM3100_I2C(int bus, int bus_frequency);
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~RM3100_I2C() override = default;
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int read(unsigned address, void *data, unsigned count) override;
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int write(unsigned address, void *data, unsigned count) override;
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protected:
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int probe() override;
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};
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device::Device *
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RM3100_I2C_interface(int bus, int bus_frequency);
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device::Device *
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RM3100_I2C_interface(int bus, int bus_frequency)
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{
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return new RM3100_I2C(bus, bus_frequency);
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}
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RM3100_I2C::RM3100_I2C(int bus, int bus_frequency) :
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I2C(DRV_MAG_DEVTYPE_RM3100, MODULE_NAME, bus, RM3100_ADDRESS, bus_frequency)
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{
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}
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int RM3100_I2C::probe()
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{
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uint8_t data = 0;
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_retries = 10;
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if (read(ADDR_REVID, &data, 1)) {
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DEVICE_DEBUG("RM3100 read_reg fail");
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return -EIO;
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}
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_retries = 2;
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if (data != RM3100_REVID) {
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DEVICE_DEBUG("RM3100 bad ID: %02x", data);
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return -EIO;
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}
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return OK;
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}
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int RM3100_I2C::read(unsigned address, void *data, unsigned count)
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{
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uint8_t cmd = address;
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int ret;
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/* We need a first transfer where we write the register to read */
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ret = transfer(&cmd, 1, nullptr, 0);
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if (ret != OK) {
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return ret;
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}
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/* Now we read the previously selected register */
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ret = transfer(nullptr, 0, (uint8_t *)data, count);
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return ret;
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}
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int RM3100_I2C::write(unsigned address, void *data, unsigned count)
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{
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uint8_t buf[32];
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if (sizeof(buf) < (count + 1)) {
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return -EIO;
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}
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buf[0] = address;
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memcpy(&buf[1], data, count);
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return transfer(&buf[0], count + 1, nullptr, 0);
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}
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