diff options
Diffstat (limited to 'src/drivers/px4io/px4io_i2c.cpp')
| -rw-r--r-- | src/drivers/px4io/px4io_i2c.cpp | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/src/drivers/px4io/px4io_i2c.cpp b/src/drivers/px4io/px4io_i2c.cpp new file mode 100644 index 000000000..19776c40a --- /dev/null +++ b/src/drivers/px4io/px4io_i2c.cpp @@ -0,0 +1,169 @@ +/**************************************************************************** + * + * 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 px4io_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 <board_config.h> + +#include <drivers/device/i2c.h> + +#ifdef PX4_I2C_OBDEV_PX4IO + +device::Device *PX4IO_i2c_interface(); + +class PX4IO_I2C : public device::I2C +{ +public: + PX4IO_I2C(int bus, uint8_t address); + virtual ~PX4IO_I2C(); + + virtual int init(); + virtual int read(unsigned offset, void *data, unsigned count = 1); + virtual int write(unsigned address, void *data, unsigned count = 1); + virtual int ioctl(unsigned operation, unsigned &arg); + +private: + +}; + +device::Device +*PX4IO_i2c_interface() +{ + return new PX4IO_I2C(PX4_I2C_BUS_ONBOARD, PX4_I2C_OBDEV_PX4IO); +} + +PX4IO_I2C::PX4IO_I2C(int bus, uint8_t address) : + I2C("PX4IO_i2c", nullptr, bus, address, 320000) +{ + _retries = 3; +} + +PX4IO_I2C::~PX4IO_I2C() +{ +} + +int +PX4IO_I2C::init() +{ + int ret; + + ret = I2C::init(); + if (ret != OK) + goto out; + + /* XXX really should do something more here */ + +out: + return 0; +} + +int +PX4IO_I2C::ioctl(unsigned operation, unsigned &arg) +{ + return 0; +} + +int +PX4IO_I2C::write(unsigned address, void *data, unsigned count) +{ + uint8_t page = address >> 8; + uint8_t offset = address & 0xff; + const uint16_t *values = reinterpret_cast<const uint16_t *>(data); + + /* set up the transfer */ + uint8_t addr[2] = { + page, + offset + }; + + i2c_msg_s msgv[2]; + + msgv[0].flags = 0; + msgv[0].buffer = addr; + msgv[0].length = 2; + + msgv[1].flags = I2C_M_NORESTART; + msgv[1].buffer = (uint8_t *)values; + msgv[1].length = 2 * count; + + int ret = transfer(msgv, 2); + if (ret == OK) + ret = count; + return ret; +} + +int +PX4IO_I2C::read(unsigned address, void *data, unsigned count) +{ + uint8_t page = address >> 8; + uint8_t offset = address & 0xff; + const uint16_t *values = reinterpret_cast<const uint16_t *>(data); + + /* set up the transfer */ + uint8_t addr[2] = { + page, + offset + }; + i2c_msg_s msgv[2]; + + msgv[0].flags = 0; + msgv[0].buffer = addr; + msgv[0].length = 2; + + msgv[1].flags = I2C_M_READ; + msgv[1].buffer = (uint8_t *)values; + msgv[1].length = 2 * count; + + int ret = transfer(msgv, 2); + if (ret == OK) + ret = count; + return ret; +} + +#endif /* PX4_I2C_OBDEV_PX4IO */ |