From 11f12b4dfed0a5209e34a3d7cc1e473c0649aca6 Mon Sep 17 00:00:00 2001 From: dominiho Date: Thu, 13 Mar 2014 15:43:52 +0100 Subject: added i2c px4flow driver --- src/drivers/px4flow/px4flow.cpp | 806 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 806 insertions(+) create mode 100644 src/drivers/px4flow/px4flow.cpp (limited to 'src/drivers/px4flow/px4flow.cpp') diff --git a/src/drivers/px4flow/px4flow.cpp b/src/drivers/px4flow/px4flow.cpp new file mode 100644 index 000000000..50089282a --- /dev/null +++ b/src/drivers/px4flow/px4flow.cpp @@ -0,0 +1,806 @@ +/**************************************************************************** + * + * 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 px4flow.cpp + * @author Dominik Honegger + * + * Driver for the PX4FLOW module connected via I2C. + */ + +#include + +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include +#include + +#include +#include +#include + +#include +#include +//#include + +#include + +/* Configuration Constants */ +#define PX4FLOW_BUS PX4_I2C_BUS_EXPANSION +#define I2C_FLOW_ADDRESS 0x45 //* 7-bit address. 8-bit address is 0x8A +//range 0x42 - 0x49 + +/* PX4FLOW Registers addresses */ +#define PX4FLOW_REG 0x00 /* Measure Register */ + +#define PX4FLOW_CONVERSION_INTERVAL 8000 /* 8ms 125Hz + +/* oddly, ERROR is not defined for c++ */ +#ifdef ERROR +# undef ERROR +#endif +static const int ERROR = -1; + +#ifndef CONFIG_SCHED_WORKQUEUE +# error This requires CONFIG_SCHED_WORKQUEUE. +#endif + +//struct i2c_frame +//{ +// uint16_t frame_count; +// int16_t pixel_flow_x_sum; +// int16_t pixel_flow_y_sum; +// int16_t flow_comp_m_x; +// int16_t flow_comp_m_y; +// int16_t qual; +// int16_t gyro_x_rate; +// int16_t gyro_y_rate; +// int16_t gyro_z_rate; +// uint8_t gyro_range; +// uint8_t sonar_timestamp; +// int16_t ground_distance; +//}; +// +//struct i2c_frame f; + +class PX4FLOW : public device::I2C +{ +public: + PX4FLOW(int bus = PX4FLOW_BUS, int address = I2C_FLOW_ADDRESS); + virtual ~PX4FLOW(); + + virtual int init(); + + virtual ssize_t read(struct file *filp, char *buffer, size_t buflen); + virtual int ioctl(struct file *filp, int cmd, unsigned long arg); + + /** + * Diagnostics - print some basic information about the driver. + */ + void print_info(); + +protected: + virtual int probe(); + +private: + + work_s _work; + RingBuffer *_reports; + bool _sensor_ok; + int _measure_ticks; + bool _collect_phase; + + orb_advert_t _px4flow_topic; + + perf_counter_t _sample_perf; + perf_counter_t _comms_errors; + perf_counter_t _buffer_overflows; + + /** + * Test whether the device supported by the driver is present at a + * specific address. + * + * @param address The I2C bus address to probe. + * @return True if the device is present. + */ + int probe_address(uint8_t address); + + /** + * Initialise the automatic measurement state machine and start it. + * + * @note This function is called at open and error time. It might make sense + * to make it more aggressive about resetting the bus in case of errors. + */ + void start(); + + /** + * Stop the automatic measurement state machine. + */ + void stop(); + + /** + * Perform a poll cycle; collect from the previous measurement + * and start a new one. + */ + void cycle(); + int measure(); + int collect(); + /** + * Static trampoline from the workq context; because we don't have a + * generic workq wrapper yet. + * + * @param arg Instance pointer for the driver that is polling. + */ + static void cycle_trampoline(void *arg); + + +}; + +/* + * Driver 'main' command. + */ +extern "C" __EXPORT int px4flow_main(int argc, char *argv[]); + +PX4FLOW::PX4FLOW(int bus, int address) : + I2C("PX4FLOW", PX4FLOW_DEVICE_PATH, bus, address, 400000),//400khz + _reports(nullptr), + _sensor_ok(false), + _measure_ticks(0), + _collect_phase(false), + _px4flow_topic(-1), + _sample_perf(perf_alloc(PC_ELAPSED, "px4flow_read")), + _comms_errors(perf_alloc(PC_COUNT, "px4flow_comms_errors")), + _buffer_overflows(perf_alloc(PC_COUNT, "px4flow_buffer_overflows")) +{ + // enable debug() calls + _debug_enabled = true; + + // work_cancel in the dtor will explode if we don't do this... + memset(&_work, 0, sizeof(_work)); +} + +PX4FLOW::~PX4FLOW() +{ + /* make sure we are truly inactive */ + stop(); + + /* free any existing reports */ + if (_reports != nullptr) + delete _reports; +} + +int +PX4FLOW::init() +{ + int ret = ERROR; + + /* do I2C init (and probe) first */ + if (I2C::init() != OK) + goto out; + + /* allocate basic report buffers */ + _reports = new RingBuffer(2, sizeof(px4flow_report)); + + if (_reports == nullptr) + goto out; + + /* get a publish handle on the px4flow topic */ + struct px4flow_report zero_report; + memset(&zero_report, 0, sizeof(zero_report)); + _px4flow_topic = orb_advertise(ORB_ID(optical_flow), &zero_report); + + if (_px4flow_topic < 0) + debug("failed to create px4flow object. Did you start uOrb?"); + + ret = OK; + /* sensor is ok, but we don't really know if it is within range */ + _sensor_ok = true; +out: + return ret; +} + +int +PX4FLOW::probe() +{ + return measure(); +} + +int +PX4FLOW::ioctl(struct file *filp, int cmd, unsigned long arg) +{ + switch (cmd) { + + case SENSORIOCSPOLLRATE: { + switch (arg) { + + /* switching to manual polling */ + case SENSOR_POLLRATE_MANUAL: + stop(); + _measure_ticks = 0; + return OK; + + /* external signalling (DRDY) not supported */ + case SENSOR_POLLRATE_EXTERNAL: + + /* zero would be bad */ + case 0: + return -EINVAL; + + /* set default/max polling rate */ + case SENSOR_POLLRATE_MAX: + case SENSOR_POLLRATE_DEFAULT: { + /* do we need to start internal polling? */ + bool want_start = (_measure_ticks == 0); + + /* set interval for next measurement to minimum legal value */ + _measure_ticks = USEC2TICK(PX4FLOW_CONVERSION_INTERVAL); + + /* if we need to start the poll state machine, do it */ + if (want_start) + start(); + + return OK; + } + + /* adjust to a legal polling interval in Hz */ + default: { + /* do we need to start internal polling? */ + bool want_start = (_measure_ticks == 0); + + /* convert hz to tick interval via microseconds */ + unsigned ticks = USEC2TICK(1000000 / arg); + + /* check against maximum rate */ + if (ticks < USEC2TICK(PX4FLOW_CONVERSION_INTERVAL)) + return -EINVAL; + + /* update interval for next measurement */ + _measure_ticks = ticks; + + /* if we need to start the poll state machine, do it */ + if (want_start) + start(); + + return OK; + } + } + } + + case SENSORIOCGPOLLRATE: + if (_measure_ticks == 0) + return SENSOR_POLLRATE_MANUAL; + + return (1000 / _measure_ticks); + + case SENSORIOCSQUEUEDEPTH: { + /* lower bound is mandatory, upper bound is a sanity check */ + if ((arg < 1) || (arg > 100)) + return -EINVAL; + + irqstate_t flags = irqsave(); + if (!_reports->resize(arg)) { + irqrestore(flags); + return -ENOMEM; + } + irqrestore(flags); + + return OK; + } + + case SENSORIOCGQUEUEDEPTH: + return _reports->size(); + + case SENSORIOCRESET: + /* XXX implement this */ + return -EINVAL; + + default: + /* give it to the superclass */ + return I2C::ioctl(filp, cmd, arg); + } +} + +ssize_t +PX4FLOW::read(struct file *filp, char *buffer, size_t buflen) +{ + unsigned count = buflen / sizeof(struct px4flow_report); + struct px4flow_report *rbuf = reinterpret_cast(buffer); + int ret = 0; + + /* buffer must be large enough */ + if (count < 1) + return -ENOSPC; + + /* if automatic measurement is enabled */ + if (_measure_ticks > 0) { + + /* + * While there is space in the caller's buffer, and reports, copy them. + * Note that we may be pre-empted by the workq thread while we are doing this; + * we are careful to avoid racing with them. + */ + while (count--) { + if (_reports->get(rbuf)) { + ret += sizeof(*rbuf); + rbuf++; + } + } + + /* if there was no data, warn the caller */ + return ret ? ret : -EAGAIN; + } + + /* manual measurement - run one conversion */ + do { + _reports->flush(); + + /* trigger a measurement */ + if (OK != measure()) { + ret = -EIO; + break; + } + + /* wait for it to complete */ + usleep(PX4FLOW_CONVERSION_INTERVAL); + + /* run the collection phase */ + if (OK != collect()) { + ret = -EIO; + break; + } + + /* state machine will have generated a report, copy it out */ + if (_reports->get(rbuf)) { + ret = sizeof(*rbuf); + } + + } while (0); + + return ret; +} + +int +PX4FLOW::measure() +{ + int ret; + + /* + * Send the command to begin a measurement. + */ + uint8_t cmd = PX4FLOW_REG; + ret = transfer(&cmd, 1, nullptr, 0); + + if (OK != ret) + { + perf_count(_comms_errors); + log("i2c::transfer returned %d", ret); + printf("i2c::transfer flow returned %d"); + return ret; + } + ret = OK; + + return ret; +} + +int +PX4FLOW::collect() +{ + int ret = -EIO; + + /* read from the sensor */ + uint8_t val[22] = {0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0,0, 0}; + + perf_begin(_sample_perf); + + ret = transfer(nullptr, 0, &val[0], 22); + + if (ret < 0) + { + log("error reading from sensor: %d", ret); + perf_count(_comms_errors); + perf_end(_sample_perf); + return ret; + } + +// f.frame_count = val[1] << 8 | val[0]; +// f.pixel_flow_x_sum= val[3] << 8 | val[2]; +// f.pixel_flow_y_sum= val[5] << 8 | val[4]; +// f.flow_comp_m_x= val[7] << 8 | val[6]; +// f.flow_comp_m_y= val[9] << 8 | val[8]; +// f.qual= val[11] << 8 | val[10]; +// f.gyro_x_rate= val[13] << 8 | val[12]; +// f.gyro_y_rate= val[15] << 8 | val[14]; +// f.gyro_z_rate= val[17] << 8 | val[16]; +// f.gyro_range= val[18]; +// f.sonar_timestamp= val[19]; +// f.ground_distance= val[21] << 8 | val[20]; + + int16_t flowcx = val[7] << 8 | val[6]; + int16_t flowcy = val[9] << 8 | val[8]; + int16_t gdist = val[21] << 8 | val[20]; + + struct px4flow_report report; + report.flow_comp_x_m = float(flowcx)/1000.0f; + report.flow_comp_y_m = float(flowcy)/1000.0f; + report.flow_raw_x= val[3] << 8 | val[2]; + report.flow_raw_y= val[5] << 8 | val[4]; + report.ground_distance_m =float(gdist)/1000.0f; + report.quality= val[10]; + report.sensor_id = 0; + report.timestamp = hrt_absolute_time(); + + + /* publish it */ + orb_publish(ORB_ID(optical_flow), _px4flow_topic, &report); + + /* post a report to the ring */ + if (_reports->force(&report)) { + perf_count(_buffer_overflows); + } + + /* notify anyone waiting for data */ + poll_notify(POLLIN); + + ret = OK; + + perf_end(_sample_perf); + return ret; +} + +void +PX4FLOW::start() +{ + /* reset the report ring and state machine */ + _collect_phase = false; + _reports->flush(); + + /* schedule a cycle to start things */ + work_queue(HPWORK, &_work, (worker_t)&PX4FLOW::cycle_trampoline, this, 1); + + /* notify about state change */ + struct subsystem_info_s info = { + true, + true, + true, + SUBSYSTEM_TYPE_OPTICALFLOW}; + static orb_advert_t pub = -1; + + if (pub > 0) { + orb_publish(ORB_ID(subsystem_info), pub, &info); + } else { + pub = orb_advertise(ORB_ID(subsystem_info), &info); + } +} + +void +PX4FLOW::stop() +{ + work_cancel(HPWORK, &_work); +} + +void +PX4FLOW::cycle_trampoline(void *arg) +{ + PX4FLOW *dev = (PX4FLOW *)arg; + + dev->cycle(); +} + +void +PX4FLOW::cycle() +{ + /* collection phase? */ + if (_collect_phase) { + + /* perform collection */ + if (OK != collect()) { + log("collection error"); + /* restart the measurement state machine */ + start(); + return; + } + + /* next phase is measurement */ + _collect_phase = false; + + /* + * Is there a collect->measure gap? + */ + if (_measure_ticks > USEC2TICK(PX4FLOW_CONVERSION_INTERVAL)) { + + /* schedule a fresh cycle call when we are ready to measure again */ + work_queue(HPWORK, + &_work, + (worker_t)&PX4FLOW::cycle_trampoline, + this, + _measure_ticks - USEC2TICK(PX4FLOW_CONVERSION_INTERVAL)); + + return; + } + } + + /* measurement phase */ + if (OK != measure()) + log("measure error"); + + /* next phase is collection */ + _collect_phase = true; + + /* schedule a fresh cycle call when the measurement is done */ + work_queue(HPWORK, + &_work, + (worker_t)&PX4FLOW::cycle_trampoline, + this, + USEC2TICK(PX4FLOW_CONVERSION_INTERVAL)); +} + +void +PX4FLOW::print_info() +{ + perf_print_counter(_sample_perf); + perf_print_counter(_comms_errors); + perf_print_counter(_buffer_overflows); + printf("poll interval: %u ticks\n", _measure_ticks); + _reports->print_info("report queue"); +} + +/** + * Local functions in support of the shell command. + */ +namespace px4flow +{ + +/* oddly, ERROR is not defined for c++ */ +#ifdef ERROR +# undef ERROR +#endif +const int ERROR = -1; + +PX4FLOW *g_dev; + +void start(); +void stop(); +void test(); +void reset(); +void info(); + +/** + * Start the driver. + */ +void +start() +{ + int fd; + + if (g_dev != nullptr) + errx(1, "already started"); + + /* create the driver */ + g_dev = new PX4FLOW(PX4FLOW_BUS); + + if (g_dev == nullptr) + goto fail; + + if (OK != g_dev->init()) + goto fail; + + /* set the poll rate to default, starts automatic data collection */ + fd = open(PX4FLOW_DEVICE_PATH, O_RDONLY); + + if (fd < 0) + goto fail; + + if (ioctl(fd, SENSORIOCSPOLLRATE, SENSOR_POLLRATE_MAX) < 0) + goto fail; + + exit(0); + +fail: + + if (g_dev != nullptr) + { + delete g_dev; + g_dev = nullptr; + } + + errx(1, "driver start failed"); +} + +/** + * Stop the driver + */ +void stop() +{ + if (g_dev != nullptr) + { + delete g_dev; + g_dev = nullptr; + } + else + { + errx(1, "driver not running"); + } + exit(0); +} + +/** + * Perform some basic functional tests on the driver; + * make sure we can collect data from the sensor in polled + * and automatic modes. + */ +void +test() +{ + struct px4flow_report report; + ssize_t sz; + int ret; + + int fd = open(PX4FLOW_DEVICE_PATH, O_RDONLY); + + if (fd < 0) + err(1, "%s open failed (try 'px4flow start' if the driver is not running", PX4FLOW_DEVICE_PATH); + + /* do a simple demand read */ + sz = read(fd, &report, sizeof(report)); + + if (sz != sizeof(report)) + // err(1, "immediate read failed"); + + warnx("single read"); + warnx("flowx: %0.2f m/s", (double)report.flow_comp_x_m); + warnx("flowy: %0.2f m/s", (double)report.flow_comp_y_m); + warnx("time: %lld", report.timestamp); + + + /* start the sensor polling at 2Hz */ + if (OK != ioctl(fd, SENSORIOCSPOLLRATE, 2)) + errx(1, "failed to set 2Hz poll rate"); + + /* read the sensor 5x and report each value */ + for (unsigned i = 0; i < 5; i++) { + struct pollfd fds; + + /* wait for data to be ready */ + fds.fd = fd; + fds.events = POLLIN; + ret = poll(&fds, 1, 2000); + + if (ret != 1) + errx(1, "timed out waiting for sensor data"); + + /* now go get it */ + sz = read(fd, &report, sizeof(report)); + + if (sz != sizeof(report)) + err(1, "periodic read failed"); + + warnx("periodic read %u", i); + warnx("flowx: %0.2f m/s", (double)report.flow_comp_x_m); + warnx("flowy: %0.2f m/s", (double)report.flow_comp_y_m); + warnx("time: %lld", report.timestamp); + + + } + + errx(0, "PASS"); +} + +/** + * Reset the driver. + */ +void +reset() +{ + int fd = open(PX4FLOW_DEVICE_PATH, O_RDONLY); + + if (fd < 0) + err(1, "failed "); + + if (ioctl(fd, SENSORIOCRESET, 0) < 0) + err(1, "driver reset failed"); + + if (ioctl(fd, SENSORIOCSPOLLRATE, SENSOR_POLLRATE_DEFAULT) < 0) + err(1, "driver poll restart failed"); + + exit(0); +} + +/** + * Print a little info about the driver. + */ +void +info() +{ + if (g_dev == nullptr) + errx(1, "driver not running"); + + printf("state @ %p\n", g_dev); + g_dev->print_info(); + + exit(0); +} + +} // namespace + +int +px4flow_main(int argc, char *argv[]) +{ + /* + * Start/load the driver. + */ + if (!strcmp(argv[1], "start")) + px4flow::start(); + + /* + * Stop the driver + */ + if (!strcmp(argv[1], "stop")) + px4flow::stop(); + + /* + * Test the driver/device. + */ + if (!strcmp(argv[1], "test")) + px4flow::test(); + + /* + * Reset the driver. + */ + if (!strcmp(argv[1], "reset")) + px4flow::reset(); + + /* + * Print driver information. + */ + if (!strcmp(argv[1], "info") || !strcmp(argv[1], "status")) + px4flow::info(); + + errx(1, "unrecognized command, try 'start', 'test', 'reset' or 'info'"); +} -- cgit v1.2.3