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px4_autopilot/apps/drivers/px4fmu/fmu.cpp

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/****************************************************************************
*
* 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 fmu.cpp
*
* Driver/configurator for the PX4 FMU multi-purpose port.
*/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.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 <drivers/device/device.h>
#include <drivers/drv_pwm_output.h>
#include <drivers/drv_gpio.h>
#include <drivers/boards/px4fmu/px4fmu_internal.h>
#include <systemlib/systemlib.h>
#include <systemlib/mixer/mixer.h>
#include <drivers/drv_mixer.h>
#include <uORB/topics/actuator_controls.h>
#include <uORB/topics/actuator_controls_effective.h>
#include <uORB/topics/actuator_outputs.h>
#include <systemlib/err.h>
class PX4FMU : public device::CDev
{
public:
enum Mode {
MODE_2PWM,
MODE_4PWM,
MODE_NONE
};
PX4FMU();
~PX4FMU();
virtual int ioctl(file *filp, int cmd, unsigned long arg);
virtual int init();
int set_mode(Mode mode);
int set_pwm_rate(unsigned rate);
private:
static const unsigned _max_actuators = 4;
Mode _mode;
int _update_rate;
int _current_update_rate;
int _task;
int _t_actuators;
int _t_armed;
orb_advert_t _t_outputs;
orb_advert_t _t_actuators_effective;
unsigned _num_outputs;
bool _primary_pwm_device;
volatile bool _task_should_exit;
bool _armed;
MixerGroup *_mixers;
actuator_controls_s _controls;
static void task_main_trampoline(int argc, char *argv[]);
void task_main() __attribute__((noreturn));
static int control_callback(uintptr_t handle,
uint8_t control_group,
uint8_t control_index,
float &input);
int pwm_ioctl(file *filp, int cmd, unsigned long arg);
struct GPIOConfig {
uint32_t input;
uint32_t output;
uint32_t alt;
};
static const GPIOConfig _gpio_tab[];
static const unsigned _ngpio;
void gpio_reset(void);
void gpio_set_function(uint32_t gpios, int function);
void gpio_write(uint32_t gpios, int function);
uint32_t gpio_read(void);
int gpio_ioctl(file *filp, int cmd, unsigned long arg);
};
const PX4FMU::GPIOConfig PX4FMU::_gpio_tab[] = {
{GPIO_GPIO0_INPUT, GPIO_GPIO0_OUTPUT, 0},
{GPIO_GPIO1_INPUT, GPIO_GPIO1_OUTPUT, 0},
{GPIO_GPIO2_INPUT, GPIO_GPIO2_OUTPUT, GPIO_USART2_CTS_1},
{GPIO_GPIO3_INPUT, GPIO_GPIO3_OUTPUT, GPIO_USART2_RTS_1},
{GPIO_GPIO4_INPUT, GPIO_GPIO4_OUTPUT, GPIO_USART2_TX_1},
{GPIO_GPIO5_INPUT, GPIO_GPIO5_OUTPUT, GPIO_USART2_RX_1},
{GPIO_GPIO6_INPUT, GPIO_GPIO6_OUTPUT, GPIO_CAN2_TX_2},
{GPIO_GPIO7_INPUT, GPIO_GPIO7_OUTPUT, GPIO_CAN2_RX_2},
};
const unsigned PX4FMU::_ngpio = sizeof(PX4FMU::_gpio_tab) / sizeof(PX4FMU::_gpio_tab[0]);
namespace
{
PX4FMU *g_fmu;
} // namespace
PX4FMU::PX4FMU() :
CDev("fmuservo", "/dev/px4fmu"),
_mode(MODE_NONE),
_update_rate(50),
_task(-1),
_t_actuators(-1),
_t_armed(-1),
_t_outputs(0),
_t_actuators_effective(0),
_num_outputs(0),
_primary_pwm_device(false),
_task_should_exit(false),
_armed(false),
_mixers(nullptr)
{
_debug_enabled = true;
}
PX4FMU::~PX4FMU()
{
if (_task != -1) {
/* tell the task we want it to go away */
_task_should_exit = true;
unsigned i = 10;
do {
/* wait 50ms - it should wake every 100ms or so worst-case */
usleep(50000);
/* if we have given up, kill it */
if (--i == 0) {
task_delete(_task);
break;
}
} while (_task != -1);
}
/* clean up the alternate device node */
if (_primary_pwm_device)
unregister_driver(PWM_OUTPUT_DEVICE_PATH);
g_fmu = nullptr;
}
int
PX4FMU::init()
{
int ret;
ASSERT(_task == -1);
/* do regular cdev init */
ret = CDev::init();
if (ret != OK)
return ret;
/* try to claim the generic PWM output device node as well - it's OK if we fail at this */
ret = register_driver(PWM_OUTPUT_DEVICE_PATH, &fops, 0666, (void *)this);
if (ret == OK) {
log("default PWM output device");
_primary_pwm_device = true;
}
/* reset GPIOs */
gpio_reset();
/* start the IO interface task */
_task = task_spawn("fmuservo",
SCHED_DEFAULT,
SCHED_PRIORITY_DEFAULT,
2048,
(main_t)&PX4FMU::task_main_trampoline,
nullptr);
if (_task < 0) {
debug("task start failed: %d", errno);
return -errno;
}
return OK;
}
void
PX4FMU::task_main_trampoline(int argc, char *argv[])
{
g_fmu->task_main();
}
int
PX4FMU::set_mode(Mode mode)
{
/*
* Configure for PWM output.
*
* Note that regardless of the configured mode, the task is always
* listening and mixing; the mode just selects which of the channels
* are presented on the output pins.
*/
switch (mode) {
case MODE_2PWM:
debug("MODE_2PWM");
/* multi-port with flow control lines as PWM */
/* XXX magic numbers */
up_pwm_servo_init(0x3);
_update_rate = 50; /* default output rate */
break;
case MODE_4PWM:
debug("MODE_4PWM");
/* multi-port as 4 PWM outs */
/* XXX magic numbers */
up_pwm_servo_init(0xf);
_update_rate = 50; /* default output rate */
break;
case MODE_NONE:
debug("MODE_NONE");
/* disable servo outputs and set a very low update rate */
up_pwm_servo_deinit();
_update_rate = 10;
break;
default:
return -EINVAL;
}
_mode = mode;
return OK;
}
int
PX4FMU::set_pwm_rate(unsigned rate)
{
if ((rate > 500) || (rate < 10))
return -EINVAL;
_update_rate = rate;
return OK;
}
void
PX4FMU::task_main()
{
/*
* Subscribe to the appropriate PWM output topic based on whether we are the
* primary PWM output or not.
*/
_t_actuators = orb_subscribe(_primary_pwm_device ? ORB_ID_VEHICLE_ATTITUDE_CONTROLS :
ORB_ID(actuator_controls_1));
/* force a reset of the update rate */
_current_update_rate = 0;
_t_armed = orb_subscribe(ORB_ID(actuator_armed));
orb_set_interval(_t_armed, 200); /* 5Hz update rate */
/* advertise the mixed control outputs */
actuator_outputs_s outputs;
memset(&outputs, 0, sizeof(outputs));
/* advertise the mixed control outputs */
_t_outputs = orb_advertise(_primary_pwm_device ? ORB_ID_VEHICLE_CONTROLS : ORB_ID(actuator_outputs_1),
&outputs);
/* advertise the effective control inputs */
actuator_controls_effective_s controls_effective;
memset(&controls_effective, 0, sizeof(controls_effective));
/* advertise the effective control inputs */
_t_actuators_effective = orb_advertise(_primary_pwm_device ? ORB_ID_VEHICLE_ATTITUDE_CONTROLS_EFFECTIVE : ORB_ID(actuator_controls_effective_1),
&controls_effective);
pollfd fds[2];
fds[0].fd = _t_actuators;
fds[0].events = POLLIN;
fds[1].fd = _t_armed;
fds[1].events = POLLIN;
unsigned num_outputs = (_mode == MODE_2PWM) ? 2 : 4;
log("starting");
/* loop until killed */
while (!_task_should_exit) {
/* handle update rate changes */
if (_current_update_rate != _update_rate) {
int update_rate_in_ms = int(1000 / _update_rate);
if (update_rate_in_ms < 2)
update_rate_in_ms = 2;
orb_set_interval(_t_actuators, update_rate_in_ms);
up_pwm_servo_set_rate(_update_rate);
_current_update_rate = _update_rate;
}
/* sleep waiting for data, but no more than a second */
int ret = ::poll(&fds[0], 2, 1000);
/* this would be bad... */
if (ret < 0) {
log("poll error %d", errno);
usleep(1000000);
continue;
}
/* do we have a control update? */
if (fds[0].revents & POLLIN) {
/* get controls - must always do this to avoid spinning */
orb_copy(ORB_ID_VEHICLE_ATTITUDE_CONTROLS, _t_actuators, &_controls);
/* can we mix? */
if (_mixers != nullptr) {
/* do mixing */
_mixers->mix(&outputs.output[0], num_outputs);
// XXX output actual limited values
memcpy(&controls_effective, &_controls, sizeof(controls_effective));
orb_publish(_primary_pwm_device ? ORB_ID_VEHICLE_ATTITUDE_CONTROLS_EFFECTIVE : ORB_ID(actuator_controls_effective_1), _t_actuators_effective, &controls_effective);
/* iterate actuators */
for (unsigned i = 0; i < num_outputs; i++) {
/* scale for PWM output 900 - 2100us */
outputs.output[i] = 1500 + (600 * outputs.output[i]);
/* output to the servo */
up_pwm_servo_set(i, outputs.output[i]);
}
/* and publish for anyone that cares to see */
orb_publish(_primary_pwm_device ? ORB_ID_VEHICLE_CONTROLS : ORB_ID(actuator_outputs_1), _t_outputs, &outputs);
}
}
/* how about an arming update? */
if (fds[1].revents & POLLIN) {
actuator_armed_s aa;
/* get new value */
orb_copy(ORB_ID(actuator_armed), _t_armed, &aa);
/* update PWM servo armed status if armed and not locked down */
up_pwm_servo_arm(aa.armed && !aa.lockdown);
}
}
::close(_t_actuators);
::close(_t_actuators_effective);
::close(_t_armed);
/* make sure servos are off */
up_pwm_servo_deinit();
log("stopping");
/* note - someone else is responsible for restoring the GPIO config */
/* tell the dtor that we are exiting */
_task = -1;
_exit(0);
}
int
PX4FMU::control_callback(uintptr_t handle,
uint8_t control_group,
uint8_t control_index,
float &input)
{
const actuator_controls_s *controls = (actuator_controls_s *)handle;
input = controls->control[control_index];
return 0;
}
int
PX4FMU::ioctl(file *filp, int cmd, unsigned long arg)
{
int ret;
// XXX disabled, confusing users
//debug("ioctl 0x%04x 0x%08x", cmd, arg);
/* try it as a GPIO ioctl first */
ret = gpio_ioctl(filp, cmd, arg);
if (ret != -ENOTTY)
return ret;
/* if we are in valid PWM mode, try it as a PWM ioctl as well */
switch(_mode) {
case MODE_2PWM:
case MODE_4PWM:
ret = pwm_ioctl(filp, cmd, arg);
break;
default:
debug("not in a PWM mode");
break;
}
/* if nobody wants it, let CDev have it */
if (ret == -ENOTTY)
ret = CDev::ioctl(filp, cmd, arg);
return ret;
}
int
PX4FMU::pwm_ioctl(file *filp, int cmd, unsigned long arg)
{
int ret = OK;
int channel;
lock();
switch (cmd) {
case PWM_SERVO_ARM:
up_pwm_servo_arm(true);
break;
case PWM_SERVO_DISARM:
up_pwm_servo_arm(false);
break;
case PWM_SERVO_SET(2):
case PWM_SERVO_SET(3):
if (_mode != MODE_4PWM) {
ret = -EINVAL;
break;
}
/* FALLTHROUGH */
case PWM_SERVO_SET(0):
case PWM_SERVO_SET(1):
if (arg < 2100) {
channel = cmd - PWM_SERVO_SET(0);
up_pwm_servo_set(channel, arg);
} else {
ret = -EINVAL;
}
break;
case PWM_SERVO_GET(2):
case PWM_SERVO_GET(3):
if (_mode != MODE_4PWM) {
ret = -EINVAL;
break;
}
/* FALLTHROUGH */
case PWM_SERVO_GET(0):
case PWM_SERVO_GET(1): {
channel = cmd - PWM_SERVO_SET(0);
*(servo_position_t *)arg = up_pwm_servo_get(channel);
break;
}
case MIXERIOCGETOUTPUTCOUNT:
if (_mode == MODE_4PWM) {
*(unsigned *)arg = 4;
} else {
*(unsigned *)arg = 2;
}
break;
case MIXERIOCRESET:
if (_mixers != nullptr) {
delete _mixers;
_mixers = nullptr;
}
break;
case MIXERIOCADDSIMPLE: {
mixer_simple_s *mixinfo = (mixer_simple_s *)arg;
SimpleMixer *mixer = new SimpleMixer(control_callback,
(uintptr_t)&_controls, mixinfo);
if (mixer->check()) {
delete mixer;
ret = -EINVAL;
} else {
if (_mixers == nullptr)
_mixers = new MixerGroup(control_callback,
(uintptr_t)&_controls);
_mixers->add_mixer(mixer);
}
break;
}
case MIXERIOCADDMULTIROTOR:
/* XXX not yet supported */
ret = -ENOTTY;
break;
case MIXERIOCLOADFILE: {
const char *path = (const char *)arg;
if (_mixers != nullptr) {
delete _mixers;
_mixers = nullptr;
}
_mixers = new MixerGroup(control_callback, (uintptr_t)&_controls);
if (_mixers == nullptr) {
ret = -ENOMEM;
} else {
debug("loading mixers from %s", path);
ret = _mixers->load_from_file(path);
if (ret != 0) {
debug("mixer load failed with %d", ret);
delete _mixers;
_mixers = nullptr;
ret = -EINVAL;
}
}
break;
}
default:
ret = -ENOTTY;
break;
}
unlock();
return ret;
}
void
PX4FMU::gpio_reset(void)
{
/*
* Setup default GPIO config - all pins as GPIOs, GPIO driver chip
* to input mode.
*/
for (unsigned i = 0; i < _ngpio; i++)
stm32_configgpio(_gpio_tab[i].input);
stm32_gpiowrite(GPIO_GPIO_DIR, 0);
stm32_configgpio(GPIO_GPIO_DIR);
}
void
PX4FMU::gpio_set_function(uint32_t gpios, int function)
{
/*
* GPIOs 0 and 1 must have the same direction as they are buffered
* by a shared 2-port driver. Any attempt to set either sets both.
*/
if (gpios & 3) {
gpios |= 3;
/* flip the buffer to output mode if required */
if (GPIO_SET_OUTPUT == function)
stm32_gpiowrite(GPIO_GPIO_DIR, 1);
}
/* configure selected GPIOs as required */
for (unsigned i = 0; i < _ngpio; i++) {
if (gpios & (1<<i)) {
switch (function) {
case GPIO_SET_INPUT:
stm32_configgpio(_gpio_tab[i].input);
break;
case GPIO_SET_OUTPUT:
stm32_configgpio(_gpio_tab[i].output);
break;
case GPIO_SET_ALT_1:
if (_gpio_tab[i].alt != 0)
stm32_configgpio(_gpio_tab[i].alt);
break;
}
}
}
/* flip buffer to input mode if required */
if ((GPIO_SET_INPUT == function) && (gpios & 3))
stm32_gpiowrite(GPIO_GPIO_DIR, 0);
}
void
PX4FMU::gpio_write(uint32_t gpios, int function)
{
int value = (function == GPIO_SET) ? 1 : 0;
for (unsigned i = 0; i < _ngpio; i++)
if (gpios & (1<<i))
stm32_gpiowrite(_gpio_tab[i].output, value);
}
uint32_t
PX4FMU::gpio_read(void)
{
uint32_t bits = 0;
for (unsigned i = 0; i < _ngpio; i++)
if (stm32_gpioread(_gpio_tab[i].input))
bits |= (1 << i);
return bits;
}
int
PX4FMU::gpio_ioctl(struct file *filp, int cmd, unsigned long arg)
{
int ret = OK;
lock();
switch (cmd) {
case GPIO_RESET:
gpio_reset();
break;
case GPIO_SET_OUTPUT:
case GPIO_SET_INPUT:
case GPIO_SET_ALT_1:
gpio_set_function(arg, cmd);
break;
case GPIO_SET_ALT_2:
case GPIO_SET_ALT_3:
case GPIO_SET_ALT_4:
ret = -EINVAL;
break;
case GPIO_SET:
case GPIO_CLEAR:
gpio_write(arg, cmd);
break;
case GPIO_GET:
*(uint32_t *)arg = gpio_read();
break;
default:
ret = -ENOTTY;
}
unlock();
return ret;
}
namespace
{
enum PortMode {
PORT_MODE_UNSET = 0,
PORT_FULL_GPIO,
PORT_FULL_SERIAL,
PORT_FULL_PWM,
PORT_GPIO_AND_SERIAL,
PORT_PWM_AND_SERIAL,
PORT_PWM_AND_GPIO,
};
PortMode g_port_mode;
int
fmu_new_mode(PortMode new_mode, int update_rate)
{
uint32_t gpio_bits;
PX4FMU::Mode servo_mode;
/* reset to all-inputs */
g_fmu->ioctl(0, GPIO_RESET, 0);
gpio_bits = 0;
servo_mode = PX4FMU::MODE_NONE;
switch (new_mode) {
case PORT_FULL_GPIO:
case PORT_MODE_UNSET:
/* nothing more to do here */
break;
case PORT_FULL_SERIAL:
/* set all multi-GPIOs to serial mode */
gpio_bits = GPIO_MULTI_1 | GPIO_MULTI_2 | GPIO_MULTI_3 | GPIO_MULTI_4;
break;
case PORT_FULL_PWM:
/* select 4-pin PWM mode */
servo_mode = PX4FMU::MODE_4PWM;
break;
case PORT_GPIO_AND_SERIAL:
/* set RX/TX multi-GPIOs to serial mode */
gpio_bits = GPIO_MULTI_3 | GPIO_MULTI_4;
break;
case PORT_PWM_AND_SERIAL:
/* select 2-pin PWM mode */
servo_mode = PX4FMU::MODE_2PWM;
/* set RX/TX multi-GPIOs to serial mode */
gpio_bits = GPIO_MULTI_3 | GPIO_MULTI_4;
break;
case PORT_PWM_AND_GPIO:
/* select 2-pin PWM mode */
servo_mode = PX4FMU::MODE_2PWM;
break;
}
/* adjust GPIO config for serial mode(s) */
if (gpio_bits != 0)
g_fmu->ioctl(0, GPIO_SET_ALT_1, gpio_bits);
/* (re)set the PWM output mode */
g_fmu->set_mode(servo_mode);
if ((servo_mode != PX4FMU::MODE_NONE) && (update_rate != 0))
g_fmu->set_pwm_rate(update_rate);
return OK;
}
int
fmu_start(void)
{
int ret = OK;
if (g_fmu == nullptr) {
g_fmu = new PX4FMU;
if (g_fmu == nullptr) {
ret = -ENOMEM;
} else {
ret = g_fmu->init();
if (ret != OK) {
delete g_fmu;
g_fmu = nullptr;
}
}
}
return ret;
}
void
test(void)
{
int fd;
fd = open(PWM_OUTPUT_DEVICE_PATH, 0);
if (fd < 0) {
puts("open fail");
exit(1);
}
ioctl(fd, PWM_SERVO_ARM, 0);
ioctl(fd, PWM_SERVO_SET(0), 1000);
close(fd);
exit(0);
}
void
fake(int argc, char *argv[])
{
if (argc < 5) {
puts("fmu fake <roll> <pitch> <yaw> <thrust> (values -100 .. 100)");
exit(1);
}
actuator_controls_s ac;
ac.control[0] = strtol(argv[1], 0, 0) / 100.0f;
ac.control[1] = strtol(argv[2], 0, 0) / 100.0f;
ac.control[2] = strtol(argv[3], 0, 0) / 100.0f;
ac.control[3] = strtol(argv[4], 0, 0) / 100.0f;
orb_advert_t handle = orb_advertise(ORB_ID_VEHICLE_ATTITUDE_CONTROLS, &ac);
if (handle < 0) {
puts("advertise failed");
exit(1);
}
exit(0);
}
} // namespace
extern "C" __EXPORT int fmu_main(int argc, char *argv[]);
int
fmu_main(int argc, char *argv[])
{
PortMode new_mode = PORT_MODE_UNSET;
int pwm_update_rate_in_hz = 0;
if (!strcmp(argv[1], "test"))
test();
if (!strcmp(argv[1], "fake"))
fake(argc - 1, argv + 1);
if (fmu_start() != OK)
errx(1, "failed to start the FMU driver");
/*
* Mode switches.
*
* XXX use getopt?
*/
for (int i = 1; i < argc; i++) { /* argv[0] is "fmu" */
if (!strcmp(argv[i], "mode_gpio")) {
new_mode = PORT_FULL_GPIO;
} else if (!strcmp(argv[i], "mode_serial")) {
new_mode = PORT_FULL_SERIAL;
} else if (!strcmp(argv[i], "mode_pwm")) {
new_mode = PORT_FULL_PWM;
} else if (!strcmp(argv[i], "mode_gpio_serial")) {
new_mode = PORT_GPIO_AND_SERIAL;
} else if (!strcmp(argv[i], "mode_pwm_serial")) {
new_mode = PORT_PWM_AND_SERIAL;
} else if (!strcmp(argv[i], "mode_pwm_gpio")) {
new_mode = PORT_PWM_AND_GPIO;
}
/* look for the optional pwm update rate for the supported modes */
if (strcmp(argv[i], "-u") == 0 || strcmp(argv[i], "--update-rate") == 0) {
if (new_mode == PORT_FULL_PWM || new_mode == PORT_PWM_AND_GPIO) {
if (argc > i + 1) {
pwm_update_rate_in_hz = atoi(argv[i + 1]);
} else {
fprintf(stderr, "missing argument for pwm update rate (-u)\n");
return 1;
}
} else {
fprintf(stderr, "pwm update rate currently only supported for mode_pwm, mode_pwm_gpio\n");
}
}
}
/* was a new mode set? */
if (new_mode != PORT_MODE_UNSET) {
/* yes but it's the same mode */
if (new_mode == g_port_mode)
return OK;
/* switch modes */
return fmu_new_mode(new_mode, pwm_update_rate_in_hz);
}
/* test, etc. here */
fprintf(stderr, "FMU: unrecognised command, try:\n");
fprintf(stderr, " mode_gpio, mode_serial, mode_pwm [-u pwm_update_rate_in_hz], mode_gpio_serial, mode_pwm_serial, mode_pwm_gpio\n");
return -EINVAL;
}