diff options
author | px4dev <px4@purgatory.org> | 2012-08-21 01:09:03 -0700 |
---|---|---|
committer | px4dev <px4@purgatory.org> | 2012-08-21 01:09:03 -0700 |
commit | 228fbb975aa2d97395dd9b34937b1348ea6b3230 (patch) | |
tree | f6e53bd6e4a0d8478596f399cfd40d953b818aba /apps/drivers | |
parent | 3246568c82b8882e6b54f15d56523fc35f606089 (diff) | |
download | px4-firmware-228fbb975aa2d97395dd9b34937b1348ea6b3230.tar.gz px4-firmware-228fbb975aa2d97395dd9b34937b1348ea6b3230.tar.bz2 px4-firmware-228fbb975aa2d97395dd9b34937b1348ea6b3230.zip |
New-style driver for the HMC5883 on I2C.
Diffstat (limited to 'apps/drivers')
-rw-r--r-- | apps/drivers/drv_mag.h | 2 | ||||
-rw-r--r-- | apps/drivers/hmc5883/Makefile | 42 | ||||
-rw-r--r-- | apps/drivers/hmc5883/hmc5883.cpp | 868 |
3 files changed, 911 insertions, 1 deletions
diff --git a/apps/drivers/drv_mag.h b/apps/drivers/drv_mag.h index 673a3988f..fe1addaeb 100644 --- a/apps/drivers/drv_mag.h +++ b/apps/drivers/drv_mag.h @@ -76,7 +76,7 @@ ORB_DECLARE(sensor_mag); */ #define _MAGIOCBASE (0x2300) -#define _MAGIOC(_n) (_IOC(_MAGIOBASE, _n)) +#define _MAGIOC(_n) (_IOC(_MAGIOCBASE, _n)) /** set the driver polling rate to (arg) Hz, or one of the MAG_POLLRATE constants */ #define MAGIOCSPOLLRATE _MAGIOC(0) diff --git a/apps/drivers/hmc5883/Makefile b/apps/drivers/hmc5883/Makefile new file mode 100644 index 000000000..aa4a397fb --- /dev/null +++ b/apps/drivers/hmc5883/Makefile @@ -0,0 +1,42 @@ +############################################################################ +# +# Copyright (C) 2012 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. +# +############################################################################ + +# +# HMC5883 driver +# + +APPNAME = hmc5883 +PRIORITY = SCHED_PRIORITY_DEFAULT +STACKSIZE = 2048 + +include $(APPDIR)/mk/app.mk diff --git a/apps/drivers/hmc5883/hmc5883.cpp b/apps/drivers/hmc5883/hmc5883.cpp new file mode 100644 index 000000000..64a0a932e --- /dev/null +++ b/apps/drivers/hmc5883/hmc5883.cpp @@ -0,0 +1,868 @@ +/**************************************************************************** + * + * Copyright (C) 2012 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 hmc5883.cpp + * + * Driver for the HMC5883 magnetometer connected via I2C. + */ + +#include <nuttx/config.h> + +#include <drivers/device/i2c.h> + +#include <sys/types.h> +#include <stdint.h> +#include <stdbool.h> +#include <semaphore.h> +#include <string.h> +#include <fcntl.h> +#include <poll.h> +#include <errno.h> +#include <stdio.h> +#include <math.h> +#include <unistd.h> + +#include <nuttx/arch.h> +#include <nuttx/wqueue.h> +#include <nuttx/clock.h> + +#include <arch/board/up_hrt.h> + +#include <systemlib/perf_counter.h> + +#include <drivers/drv_mag.h> + + +/* + * HMC5883 internal constants and data structures. + */ + +/* Max measurement rate is 160Hz */ +#define HMC5883_CONVERSION_INTERVAL (1000000 / 160) /* microseconds */ + +#define ADDR_CONF_A 0x00 +#define ADDR_CONF_B 0x01 +#define ADDR_MODE 0x02 +#define ADDR_DATA_OUT_X_MSB 0x03 +#define ADDR_DATA_OUT_X_LSB 0x04 +#define ADDR_DATA_OUT_Z_MSB 0x05 +#define ADDR_DATA_OUT_Z_LSB 0x06 +#define ADDR_DATA_OUT_Y_MSB 0x07 +#define ADDR_DATA_OUT_Y_LSB 0x08 +#define ADDR_STATUS 0x09 +#define ADDR_ID_A 0x0a +#define ADDR_ID_B 0x0b +#define ADDR_ID_C 0x0c + +#define HMC5883L_ADDRESS 0x1E + +/* modes not changeable outside of driver */ +#define HMC5883L_MODE_NORMAL (0 << 0) /* default */ +#define HMC5883L_MODE_POSITIVE_BIAS (1 << 0) /* positive bias */ +#define HMC5883L_MODE_NEGATIVE_BIAS (1 << 1) /* negative bias */ + +#define HMC5883L_AVERAGING_1 (0 << 5) /* conf a register */ +#define HMC5883L_AVERAGING_2 (1 << 5) +#define HMC5883L_AVERAGING_4 (2 << 5) +#define HMC5883L_AVERAGING_8 (3 << 5) + +#define MODE_REG_CONTINOUS_MODE (0 << 0) +#define MODE_REG_SINGLE_MODE (1 << 0) /* default */ + +#define STATUS_REG_DATA_OUT_LOCK (1 << 1) /* page 16: set if data is only partially read, read device to reset */ +#define STATUS_REG_DATA_READY (1 << 0) /* page 16: set if all axes have valid measurements */ + +#define ID_A_WHO_AM_I 'H' +#define ID_B_WHO_AM_I '4' +#define ID_C_WHO_AM_I '3' + + +/* oddly, ERROR is not defined for c++ */ +#ifdef ERROR +# undef ERROR +#endif +static const int ERROR = -1; + +class HMC5883 : public device::I2C +{ +public: + HMC5883(int bus); + ~HMC5883(); + + 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); + + virtual int open_first(struct file *filp); + virtual int close_last(struct file *filp); + + /** + * Diagnostics - print some basic information about the driver. + */ + void print_info(); + +protected: + virtual int probe(); + +private: + struct work_s _work; + unsigned _measure_ticks; + + unsigned _num_reports; + volatile unsigned _next_report; + volatile unsigned _oldest_report; + struct mag_report *_reports; + + bool _collect_phase; + + int _mag_topic; + + unsigned _reads; + unsigned _measure_errors; + unsigned _read_errors; + unsigned _buf_overflows; + + perf_counter_t _sample_perf; + + /** + * 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. + * + * This is the heart of the measurement state machine. This function + * alternately starts a measurement, or collects the data from the + * previous measurement. + * + * When the interval between measurements is greater than the minimum + * measurement interval, a gap is inserted between collection + * and measurement to provide the most recent measurement possible + * at the next interval. + */ + void cycle(); + + /** + * 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); + + /** + * Write a register. + * + * @param reg The register to write. + * @param val The value to write. + * @return OK on write success. + */ + int write_reg(uint8_t reg, uint8_t val); + + /** + * Read a register. + * + * @param reg The register to read. + * @param val The value read. + * @return OK on read success. + */ + int read_reg(uint8_t reg, uint8_t &val); + + /** + * Issue a measurement command. + * + * @return OK if the measurement command was successful. + */ + int measure(); + + /** + * Collect the result of the most recent measurement. + */ + int collect(); + + /** + * Convert a big-endian signed 16-bit value to a float. + * + * @param in A signed 16-bit big-endian value. + * @return The floating-point representation of the value. + */ + float meas_to_float(uint8_t in[2]); + +}; + +/* helper macro for handling report buffer indices */ +#define INCREMENT(_x, _lim) do { _x++; if (_x >= _lim) _x = 0; } while(0) + +/* + * Driver 'main' command. + */ +extern "C" __EXPORT int hmc5883_main(int argc, char *argv[]); + + +HMC5883::HMC5883(int bus) : + I2C("HMC5883", MAG_DEVICE_PATH, bus, HMC5883L_ADDRESS, 400000), + _measure_ticks(0), + _num_reports(0), + _next_report(0), + _oldest_report(0), + _reports(nullptr), + _reads(0), + _measure_errors(0), + _read_errors(0), + _buf_overflows(0), + _sample_perf(perf_alloc(PC_ELAPSED, "hmc5883_read")) +{ + // enable debug() calls + _debug_enabled = true; + + // work_cancel in the dtor will explode if we don't do this... + _work.worker = nullptr; +} + +HMC5883::~HMC5883() +{ + /* make sure we are truly inactive */ + stop(); + + /* free any existing reports */ + if (_reports != nullptr) + delete[] _reports; +} + +int +HMC5883::init() +{ + int ret = ERROR; + + /* do I2C init (and probe) first */ + ret = I2C::init(); + if (ret != OK) + goto out; + + /* assuming we're good, advertise the object */ + struct mag_report m; + + /* if this fails (e.g. no object in the system) that's OK */ + memset(&m, 0, sizeof(m)); + _mag_topic = orb_advertise(ORB_ID(sensor_mag), &m); + + if (_mag_topic < 0) { + debug("failed to create sensor_baro object"); + } else { + ret = 0; + } +out: + return ret; +} + +int +HMC5883::open_first(struct file *filp) +{ + /* reset to manual-poll mode */ + _measure_ticks = 0; + + /* allocate basic report buffers */ + _num_reports = 2; + _reports = new struct mag_report[_num_reports]; + _oldest_report = _next_report = 0; + + return OK; +} + +int +HMC5883::close_last(struct file *filp) +{ + /* stop measurement */ + stop(); + + /* free report buffers */ + if (_reports != nullptr) { + delete[] _reports; + _num_reports = 0; + } + + _measure_ticks = 0; + + return OK; +} + +int +HMC5883::probe() +{ + uint8_t cmd[] = { ADDR_STATUS }; + uint8_t data[3]; + + if (read_reg(ADDR_ID_A, data[0]) || + read_reg(ADDR_ID_B, data[1]) || + read_reg(ADDR_ID_C, data[2])) + debug("read_reg fail"); + + if ((data[0] != ID_A_WHO_AM_I) || + (data[1] != ID_B_WHO_AM_I) || + (data[2] != ID_C_WHO_AM_I)) { + debug("ID byte mismatch (%02x,%02x,%02x)", data[0], data[1], data[2]); + return -EIO; + } + + return OK; +} + +ssize_t +HMC5883::read(struct file *filp, char *buffer, size_t buflen) +{ + unsigned count = buflen / sizeof(struct mag_report); + 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 (_oldest_report != _next_report) { + memcpy(buffer, _reports + _oldest_report, sizeof(*_reports)); + ret += sizeof(_reports[0]); + INCREMENT(_oldest_report, _num_reports); + } + } + + _reads++; + + /* if there was no data, warn the caller */ + return ret ? ret : -EAGAIN; + } + + /* manual measurement - run one conversion */ + /* XXX really it'd be nice to lock against other readers here */ + do { + _oldest_report = _next_report = 0; + + /* trigger a measurement */ + if (OK != measure()) { + ret = -EIO; + break; + } + + /* wait for it to complete */ + usleep(HMC5883_CONVERSION_INTERVAL); + + /* run the collection phase */ + if (OK != collect()) { + ret = -EIO; + break; + } + + /* state machine will have generated a report, copy it out */ + memcpy(buffer, _reports, sizeof(*_reports)); + ret = sizeof(*_reports); + _reads++; + + } while (0); + + return ret; +} + +int +HMC5883::ioctl(struct file *filp, int cmd, unsigned long arg) +{ + switch (cmd) { + + case MAGIOCSPOLLRATE: { + switch (arg) { + + /* switching to manual polling */ + case MAG_POLLRATE_MANUAL: + stop(); + _measure_ticks = 0; + return OK; + + /* external signalling not supported */ + case MAG_POLLRATE_EXTERNAL: + + /* zero would be bad */ + case 0: + return -EINVAL; + + /* 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(HMC5883_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 MAGIOCSQUEUEDEPTH: { + /* lower bound is mandatory, upper bound is a sanity check */ + if ((arg < 2) || (arg > 100)) + return -EINVAL; + + /* allocate new buffer */ + struct mag_report *buf = new struct mag_report[arg]; + + if (nullptr == buf) + return -ENOMEM; + + /* reset the measurement state machine with the new buffer, free the old */ + stop(); + delete[] _reports; + _num_reports = arg; + _reports = buf; + start(); + + return OK; + } + + case MAGIOCSREPORTFORMAT: + return -EINVAL; + + default: + /* give it to the superclass */ + return I2C::ioctl(filp, cmd, arg); + } +} + +void +HMC5883::start() +{ + /* make sure we are stopped first */ + stop(); + + /* reset the report ring and state machine */ + _collect_phase = false; + _oldest_report = _next_report = 0; + + /* schedule a cycle to start things */ + work_queue(&_work, (worker_t)&HMC5883::cycle_trampoline, this, 1); +} + +void +HMC5883::stop() +{ + work_cancel(&_work); +} + +void +HMC5883::cycle_trampoline(void *arg) +{ + HMC5883 *dev = (HMC5883 *)arg; + + dev->cycle(); +} + +void +HMC5883::cycle() +{ + /* collection phase? */ + if (_collect_phase) { + + /* perform collection */ + if (OK != collect()) { + log("FATAL collection error - restarting\n"); + start(); + return; + } + + /* next phase is measurement */ + _collect_phase = false; + + /* + * Is there a collect->measure gap? + */ + if (_measure_ticks > USEC2TICK(HMC5883_CONVERSION_INTERVAL)) { + + /* schedule a fresh cycle call when we are ready to measure again */ + work_queue(&_work, + (worker_t)&HMC5883::cycle_trampoline, + this, + _measure_ticks - USEC2TICK(HMC5883_CONVERSION_INTERVAL)); + + return; + } + } + + /* measurement phase */ + if (OK != measure()) { + log("FATAL measure error - restarting\n"); + start(); + } + + /* next phase is collection */ + _collect_phase = true; + + /* schedule a fresh cycle call when the measurement is done */ + work_queue(&_work, + (worker_t)&HMC5883::cycle_trampoline, + this, + USEC2TICK(HMC5883_CONVERSION_INTERVAL)); +} + +int +HMC5883::measure() +{ + int ret; + + /* + * Send the command to begin a measurement. + */ + ret = write_reg(ADDR_MODE, MODE_REG_SINGLE_MODE); + if (OK != ret) + _measure_errors++; + + return ret; +} + +int +HMC5883::collect() +{ +#pragma pack(push, 1) + struct { /* status register and data as read back from the device */ + uint8_t x[2]; + uint8_t z[2]; + uint8_t y[2]; + uint8_t status; + } hmc_report; +#pragma pack(pop) + int ret = -EIO; + uint8_t cmd[1]; + + perf_begin(_sample_perf); + + /* this should be fairly close to the end of the measurement, so the best approximation of the time */ + _reports[_next_report].timestamp = hrt_absolute_time(); + + /* get measurements from the device */ + cmd[0] = ADDR_DATA_OUT_X_MSB; + ret = transfer(&cmd[0], 1, &hmc_report.x[0], sizeof(hmc_report)); + if (ret != OK) { + debug("data/status read error"); + goto out; + } + + /* XXX check status? */ + + /* XXX scaling */ + _reports[_next_report].x = meas_to_float(hmc_report.x); + _reports[_next_report].y = meas_to_float(hmc_report.y); + _reports[_next_report].z = meas_to_float(hmc_report.z); + + /* publish it */ + orb_publish(ORB_ID(sensor_mag), _mag_topic, &_reports[_next_report]); + + /* post a report to the ring - note, not locked */ + INCREMENT(_next_report, _num_reports); + + /* if we are running up against the oldest report, toss it */ + if (_next_report == _oldest_report) { + _buf_overflows++; + INCREMENT(_oldest_report, _num_reports); + } + + /* notify anyone waiting for data */ + poll_notify(POLLIN); + + ret = OK; + +out: + perf_end(_sample_perf); + return ret; +} + +int +HMC5883::write_reg(uint8_t reg, uint8_t val) +{ + uint8_t cmd[] = { reg, val }; + + return transfer(&cmd[0], 2, nullptr, 0); +} + +int +HMC5883::read_reg(uint8_t reg, uint8_t &val) +{ + return transfer(®, 1, &val, 1); +} + +float +HMC5883::meas_to_float(uint8_t in[2]) +{ + union { + uint8_t b[2]; + int16_t w; + } u; + + u.b[0] = in[1]; + u.b[1] = in[0]; + + return (float) u.w; +} + +void +HMC5883::print_info() +{ + printf("reads: %u\n", _reads); + printf("measure errors: %u\n", _measure_errors); + printf("read errors: %u\n", _read_errors); + printf("read overflows: %u\n", _buf_overflows); + printf("poll interval: %u ticks\n", _measure_ticks); + printf("report queue: %u (%u/%u @ %p)\n", + _num_reports, _oldest_report, _next_report, _reports); +} + +/** + * Local functions in support of the shell command. + */ +namespace +{ + +/* oddly, ERROR is not defined for c++ */ +#ifdef ERROR +# undef ERROR +#endif +const int ERROR = -1; + +HMC5883 *g_dev; + +/* + * XXX this should just be part of the generic sensors test... + */ + + +int +test_fail(const char *fmt, ...) +{ + va_list ap; + + fprintf(stderr, "FAIL: "); + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + fprintf(stderr, "\n"); + fflush(stderr); + return ERROR; +} + +int +test_note(const char *fmt, ...) +{ + va_list ap; + + fprintf(stderr, "note: "); + va_start(ap, fmt); + vfprintf(stderr, fmt, ap); + va_end(ap); + fprintf(stderr, "\n"); + fflush(stderr); + return OK; +} + +/** + * Perform some basic functional tests on the driver; + * make sure we can collect data from the sensor in polled + * and automatic modes. + * + * @param fd An open file descriptor on the driver. + */ +int +test(int fd) +{ + struct mag_report report; + ssize_t sz; + int ret; + + + /* do a simple demand read */ + sz = read(fd, &report, sizeof(report)); + + if (sz != sizeof(report)) + return test_fail("immediate read failed: %d", errno); + + test_note("single read"); + test_note("measurement: %.6f %.6f %.6f", report.x, report.y, report.z); + test_note("time: %lld", report.timestamp); + usleep(1000000); + + /* set the queue depth to 10 */ + if (OK != ioctl(fd, MAGIOCSQUEUEDEPTH, 10)) + return test_fail("failed to set queue depth"); + + /* start the sensor polling at 2Hz */ + if (OK != ioctl(fd, MAGIOCSPOLLRATE, 2)) + return test_fail("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) + return test_fail("timed out waiting for sensor data"); + + /* now go get it */ + sz = read(fd, &report, sizeof(report)); + + if (sz != sizeof(report)) + return test_fail("periodic read failed: %d", errno); + + test_note("periodic read %u", i); + test_note("measurement: %.6f %.6f %.6f", report.x, report.y, report.z); + test_note("time: %lld", report.timestamp); + } + + return test_note("PASS"); + return OK; +} + +int +info() +{ + if (g_dev == nullptr) { + fprintf(stderr, "HMC5883: driver not running\n"); + return -ENOENT; + } + + printf("state @ %p\n", g_dev); + g_dev->print_info(); + + return OK; +} + + +} // namespace + +int +hmc5883_main(int argc, char *argv[]) +{ + /* + * Start/load the driver. + * + * XXX it would be nice to have a wrapper for this... + */ + if (!strcmp(argv[1], "start")) { + + if (g_dev != nullptr) { + fprintf(stderr, "HMC5883: already loaded\n"); + return -EBUSY; + } + + /* create the driver */ + /* XXX HORRIBLE hack - the bus number should not come from here */ + g_dev = new HMC5883(2); + + if (g_dev == nullptr) { + fprintf(stderr, "HMC5883: driver alloc failed\n"); + return -ENOMEM; + } + + if (OK != g_dev->init()) { + fprintf(stderr, "HMC5883: driver init failed\n"); + usleep(100000); + delete g_dev; + g_dev = nullptr; + return -EIO; + } + + return OK; + } + + /* + * Test the driver/device. + */ + if (!strcmp(argv[1], "test")) { + int fd, ret; + + fd = open(MAG_DEVICE_PATH, O_RDONLY); + + if (fd < 0) + return test_fail("driver open failed: %d", errno); + + ret = test(fd); + close(fd); + return ret; + } + + /* + * Print driver information. + */ + if (!strcmp(argv[1], "info")) + return info(); + + fprintf(stderr, "unrecognised command, try 'start', 'test' or 'info'\n"); + return -EINVAL; +} |