diff options
Diffstat (limited to 'src/drivers/px4io/interface_i2c.cpp')
| -rw-r--r-- | src/drivers/px4io/interface_i2c.cpp | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/drivers/px4io/interface_i2c.cpp b/src/drivers/px4io/interface_i2c.cpp new file mode 100644 index 000000000..6895a7e23 --- /dev/null +++ b/src/drivers/px4io/interface_i2c.cpp @@ -0,0 +1,179 @@ +/**************************************************************************** + * + * Copyright (c) 2013 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 interface_i2c.cpp + * + * I2C interface for PX4IO + */ + +/* XXX trim includes */ +#include <nuttx/config.h> + +#include <sys/types.h> +#include <stdint.h> +#include <stdbool.h> +#include <assert.h> +#include <debug.h> +#include <errno.h> +#include <unistd.h> + +#include <arch/board/board.h> + +#include <nuttx/i2c.h> + +#include <mavlink/mavlink_log.h> +#include "uploader.h" +#include <modules/px4iofirmware/protocol.h> + +#include "interface.h" + +class PX4IO_I2C : public PX4IO_interface +{ +public: + PX4IO_I2C(int bus, uint8_t address); + virtual ~PX4IO_I2C(); + + virtual int set_reg(uint8_t page, uint8_t offset, const uint16_t *values, unsigned num_values); + virtual int get_reg(uint8_t page, uint8_t offset, uint16_t *values, unsigned num_values); + + virtual bool ok(); + +private: + static const unsigned _retries = 2; + + struct i2c_dev_s *_dev; + uint8_t _address; +}; + +PX4IO_interface *io_i2c_interface(int bus, uint8_t address) +{ + return new PX4IO_I2C(bus, address); +} + +PX4IO_I2C::PX4IO_I2C(int bus, uint8_t address) : + _dev(nullptr), + _address(address) +{ + _dev = up_i2cinitialize(bus); + if (_dev) + I2C_SETFREQUENCY(_dev, 400000); +} + +PX4IO_I2C::~PX4IO_I2C() +{ + if (_dev) + up_i2cuninitialize(_dev); +} + +bool +PX4IO_I2C::ok() +{ + if (!_dev) + return false; + + /* check any other status here */ + + return true; +} + +int +PX4IO_I2C::set_reg(uint8_t page, uint8_t offset, const uint16_t *values, unsigned num_values) +{ + int ret; + + /* set up the transfer */ + uint8_t addr[2] = { + page, + offset + }; + i2c_msg_s msgv[2]; + + msgv[0].addr = _address; + msgv[0].flags = 0; + msgv[0].buffer = addr; + msgv[0].length = 2; + + msgv[1].addr = _address; + msgv[1].flags = I2C_M_NORESTART; + msgv[1].buffer = (uint8_t *)values; + msgv[1].length = num_values * sizeof(*values); + + unsigned tries = 0; + do { + + /* perform the transfer */ + ret = I2C_TRANSFER(_dev, msgv, 2); + + if (ret == OK) + break; + + } while (tries++ < _retries); + + return ret; +} + +int +PX4IO_I2C::get_reg(uint8_t page, uint8_t offset, uint16_t *values, unsigned num_values) +{ + int ret; + + /* set up the transfer */ + uint8_t addr[2] = { + page, + offset + }; + i2c_msg_s msgv[2]; + + msgv[0].addr = _address; + msgv[0].flags = 0; + msgv[0].buffer = addr; + msgv[0].length = 2; + + msgv[1].addr = _address; + msgv[1].flags = I2C_M_READ; + msgv[1].buffer = (uint8_t *)values; + msgv[1].length = num_values * sizeof(*values); + + unsigned tries = 0; + do { + /* perform the transfer */ + ret = I2C_TRANSFER(_dev, msgv, 2); + + if (ret == OK) + break; + + } while (tries++ < _retries); + + return ret; +} |