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bizhang_-obav/src/drivers/mpu6000/mpu6000.cpp
Andrew Tridgell af47a3d795 mpu6000: change bus speed based on registers being accessed 
this ensures we follow the datasheet requirement of 1MHz for general
registers and up to 20MHz for sensor and int status registers
2013-11-30 20:17:55 +11:00

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/****************************************************************************
*
* Copyright (c) 2012, 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 mpu6000.cpp
*
* Driver for the Invensense MPU6000 connected via SPI.
*
* @author Andrew Tridgell
* @author Pat Hickey
*/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <stddef.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 <systemlib/perf_counter.h>
#include <systemlib/err.h>
#include <systemlib/conversions.h>
#include <nuttx/arch.h>
#include <nuttx/clock.h>
#include <board_config.h>
#include <drivers/drv_hrt.h>
#include <drivers/device/spi.h>
#include <drivers/device/ringbuffer.h>
#include <drivers/drv_accel.h>
#include <drivers/drv_gyro.h>
#include <mathlib/math/filter/LowPassFilter2p.hpp>
#define DIR_READ 0x80
#define DIR_WRITE 0x00
// MPU 6000 registers
#define MPUREG_WHOAMI 0x75
#define MPUREG_SMPLRT_DIV 0x19
#define MPUREG_CONFIG 0x1A
#define MPUREG_GYRO_CONFIG 0x1B
#define MPUREG_ACCEL_CONFIG 0x1C
#define MPUREG_FIFO_EN 0x23
#define MPUREG_INT_PIN_CFG 0x37
#define MPUREG_INT_ENABLE 0x38
#define MPUREG_INT_STATUS 0x3A
#define MPUREG_ACCEL_XOUT_H 0x3B
#define MPUREG_ACCEL_XOUT_L 0x3C
#define MPUREG_ACCEL_YOUT_H 0x3D
#define MPUREG_ACCEL_YOUT_L 0x3E
#define MPUREG_ACCEL_ZOUT_H 0x3F
#define MPUREG_ACCEL_ZOUT_L 0x40
#define MPUREG_TEMP_OUT_H 0x41
#define MPUREG_TEMP_OUT_L 0x42
#define MPUREG_GYRO_XOUT_H 0x43
#define MPUREG_GYRO_XOUT_L 0x44
#define MPUREG_GYRO_YOUT_H 0x45
#define MPUREG_GYRO_YOUT_L 0x46
#define MPUREG_GYRO_ZOUT_H 0x47
#define MPUREG_GYRO_ZOUT_L 0x48
#define MPUREG_USER_CTRL 0x6A
#define MPUREG_PWR_MGMT_1 0x6B
#define MPUREG_PWR_MGMT_2 0x6C
#define MPUREG_FIFO_COUNTH 0x72
#define MPUREG_FIFO_COUNTL 0x73
#define MPUREG_FIFO_R_W 0x74
#define MPUREG_PRODUCT_ID 0x0C
// Configuration bits MPU 3000 and MPU 6000 (not revised)?
#define BIT_SLEEP 0x40
#define BIT_H_RESET 0x80
#define BITS_CLKSEL 0x07
#define MPU_CLK_SEL_PLLGYROX 0x01
#define MPU_CLK_SEL_PLLGYROZ 0x03
#define MPU_EXT_SYNC_GYROX 0x02
#define BITS_FS_250DPS 0x00
#define BITS_FS_500DPS 0x08
#define BITS_FS_1000DPS 0x10
#define BITS_FS_2000DPS 0x18
#define BITS_FS_MASK 0x18
#define BITS_DLPF_CFG_256HZ_NOLPF2 0x00
#define BITS_DLPF_CFG_188HZ 0x01
#define BITS_DLPF_CFG_98HZ 0x02
#define BITS_DLPF_CFG_42HZ 0x03
#define BITS_DLPF_CFG_20HZ 0x04
#define BITS_DLPF_CFG_10HZ 0x05
#define BITS_DLPF_CFG_5HZ 0x06
#define BITS_DLPF_CFG_2100HZ_NOLPF 0x07
#define BITS_DLPF_CFG_MASK 0x07
#define BIT_INT_ANYRD_2CLEAR 0x10
#define BIT_RAW_RDY_EN 0x01
#define BIT_I2C_IF_DIS 0x10
#define BIT_INT_STATUS_DATA 0x01
// Product ID Description for MPU6000
// high 4 bits low 4 bits
// Product Name Product Revision
#define MPU6000ES_REV_C4 0x14
#define MPU6000ES_REV_C5 0x15
#define MPU6000ES_REV_D6 0x16
#define MPU6000ES_REV_D7 0x17
#define MPU6000ES_REV_D8 0x18
#define MPU6000_REV_C4 0x54
#define MPU6000_REV_C5 0x55
#define MPU6000_REV_D6 0x56
#define MPU6000_REV_D7 0x57
#define MPU6000_REV_D8 0x58
#define MPU6000_REV_D9 0x59
#define MPU6000_REV_D10 0x5A
#define MPU6000_ACCEL_DEFAULT_RANGE_G 8
#define MPU6000_ACCEL_DEFAULT_RATE 1000
#define MPU6000_ACCEL_DEFAULT_DRIVER_FILTER_FREQ 30
#define MPU6000_GYRO_DEFAULT_RANGE_G 8
#define MPU6000_GYRO_DEFAULT_RATE 1000
#define MPU6000_GYRO_DEFAULT_DRIVER_FILTER_FREQ 30
#define MPU6000_DEFAULT_ONCHIP_FILTER_FREQ 42
#define MPU6000_ONE_G 9.80665f
/*
the MPU6000 can only handle high SPI bus speeds on the sensor and
interrupt status registers. All other registers have a maximum 1MHz
SPI speed
*/
#define MPU6000_LOW_BUS_SPEED 1000*1000
#define MPU6000_HIGH_BUS_SPEED 10*1000*1000
class MPU6000_gyro;
class MPU6000 : public device::SPI
{
public:
MPU6000(int bus, spi_dev_e device);
virtual ~MPU6000();
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();
friend class MPU6000_gyro;
virtual ssize_t gyro_read(struct file *filp, char *buffer, size_t buflen);
virtual int gyro_ioctl(struct file *filp, int cmd, unsigned long arg);
private:
MPU6000_gyro *_gyro;
uint8_t _product; /** product code */
struct hrt_call _call;
unsigned _call_interval;
RingBuffer *_accel_reports;
struct accel_scale _accel_scale;
float _accel_range_scale;
float _accel_range_m_s2;
orb_advert_t _accel_topic;
RingBuffer *_gyro_reports;
struct gyro_scale _gyro_scale;
float _gyro_range_scale;
float _gyro_range_rad_s;
orb_advert_t _gyro_topic;
unsigned _reads;
unsigned _sample_rate;
perf_counter_t _sample_perf;
math::LowPassFilter2p _accel_filter_x;
math::LowPassFilter2p _accel_filter_y;
math::LowPassFilter2p _accel_filter_z;
math::LowPassFilter2p _gyro_filter_x;
math::LowPassFilter2p _gyro_filter_y;
math::LowPassFilter2p _gyro_filter_z;
/**
* Start automatic measurement.
*/
void start();
/**
* Stop automatic measurement.
*/
void stop();
/**
* Reset chip.
*
* Resets the chip and measurements ranges, but not scale and offset.
*/
void reset();
/**
* Static trampoline from the hrt_call context; because we don't have a
* generic hrt wrapper yet.
*
* Called by the HRT in interrupt context at the specified rate if
* automatic polling is enabled.
*
* @param arg Instance pointer for the driver that is polling.
*/
static void measure_trampoline(void *arg);
/**
* Fetch measurements from the sensor and update the report buffers.
*/
void measure();
/**
* Read a register from the MPU6000
*
* @param The register to read.
* @return The value that was read.
*/
uint8_t read_reg(unsigned reg);
uint16_t read_reg16(unsigned reg);
/**
* Write a register in the MPU6000
*
* @param reg The register to write.
* @param value The new value to write.
*/
void write_reg(unsigned reg, uint8_t value);
/**
* Modify a register in the MPU6000
*
* Bits are cleared before bits are set.
*
* @param reg The register to modify.
* @param clearbits Bits in the register to clear.
* @param setbits Bits in the register to set.
*/
void modify_reg(unsigned reg, uint8_t clearbits, uint8_t setbits);
/**
* Set the MPU6000 measurement range.
*
* @param max_g The maximum G value the range must support.
* @return OK if the value can be supported, -ERANGE otherwise.
*/
int set_range(unsigned max_g);
/**
* Swap a 16-bit value read from the MPU6000 to native byte order.
*/
uint16_t swap16(uint16_t val) { return (val >> 8) | (val << 8); }
/**
* Measurement self test
*
* @return 0 on success, 1 on failure
*/
int self_test();
/**
* Accel self test
*
* @return 0 on success, 1 on failure
*/
int accel_self_test();
/**
* Gyro self test
*
* @return 0 on success, 1 on failure
*/
int gyro_self_test();
/*
set low pass filter frequency
*/
void _set_dlpf_filter(uint16_t frequency_hz);
/*
set sample rate (approximate) - 1kHz to 5Hz
*/
void _set_sample_rate(uint16_t desired_sample_rate_hz);
};
/**
* Helper class implementing the gyro driver node.
*/
class MPU6000_gyro : public device::CDev
{
public:
MPU6000_gyro(MPU6000 *parent);
~MPU6000_gyro();
virtual ssize_t read(struct file *filp, char *buffer, size_t buflen);
virtual int ioctl(struct file *filp, int cmd, unsigned long arg);
protected:
friend class MPU6000;
void parent_poll_notify();
private:
MPU6000 *_parent;
};
/** driver 'main' command */
extern "C" { __EXPORT int mpu6000_main(int argc, char *argv[]); }
MPU6000::MPU6000(int bus, spi_dev_e device) :
SPI("MPU6000", ACCEL_DEVICE_PATH, bus, device, SPIDEV_MODE3, MPU6000_LOW_BUS_SPEED),
_gyro(new MPU6000_gyro(this)),
_product(0),
_call_interval(0),
_accel_reports(nullptr),
_accel_range_scale(0.0f),
_accel_range_m_s2(0.0f),
_accel_topic(-1),
_gyro_reports(nullptr),
_gyro_range_scale(0.0f),
_gyro_range_rad_s(0.0f),
_gyro_topic(-1),
_reads(0),
_sample_rate(1000),
_sample_perf(perf_alloc(PC_ELAPSED, "mpu6000_read")),
_accel_filter_x(MPU6000_ACCEL_DEFAULT_RATE, MPU6000_ACCEL_DEFAULT_DRIVER_FILTER_FREQ),
_accel_filter_y(MPU6000_ACCEL_DEFAULT_RATE, MPU6000_ACCEL_DEFAULT_DRIVER_FILTER_FREQ),
_accel_filter_z(MPU6000_ACCEL_DEFAULT_RATE, MPU6000_ACCEL_DEFAULT_DRIVER_FILTER_FREQ),
_gyro_filter_x(MPU6000_GYRO_DEFAULT_RATE, MPU6000_GYRO_DEFAULT_DRIVER_FILTER_FREQ),
_gyro_filter_y(MPU6000_GYRO_DEFAULT_RATE, MPU6000_GYRO_DEFAULT_DRIVER_FILTER_FREQ),
_gyro_filter_z(MPU6000_GYRO_DEFAULT_RATE, MPU6000_GYRO_DEFAULT_DRIVER_FILTER_FREQ)
{
// disable debug() calls
_debug_enabled = false;
// default accel scale factors
_accel_scale.x_offset = 0;
_accel_scale.x_scale = 1.0f;
_accel_scale.y_offset = 0;
_accel_scale.y_scale = 1.0f;
_accel_scale.z_offset = 0;
_accel_scale.z_scale = 1.0f;
// default gyro scale factors
_gyro_scale.x_offset = 0;
_gyro_scale.x_scale = 1.0f;
_gyro_scale.y_offset = 0;
_gyro_scale.y_scale = 1.0f;
_gyro_scale.z_offset = 0;
_gyro_scale.z_scale = 1.0f;
memset(&_call, 0, sizeof(_call));
}
MPU6000::~MPU6000()
{
/* make sure we are truly inactive */
stop();
/* delete the gyro subdriver */
delete _gyro;
/* free any existing reports */
if (_accel_reports != nullptr)
delete _accel_reports;
if (_gyro_reports != nullptr)
delete _gyro_reports;
/* delete the perf counter */
perf_free(_sample_perf);
}
int
MPU6000::init()
{
int ret;
int gyro_ret;
/* do SPI init (and probe) first */
ret = SPI::init();
/* if probe/setup failed, bail now */
if (ret != OK) {
debug("SPI setup failed");
return ret;
}
/* allocate basic report buffers */
_accel_reports = new RingBuffer(2, sizeof(accel_report));
if (_accel_reports == nullptr)
goto out;
_gyro_reports = new RingBuffer(2, sizeof(gyro_report));
if (_gyro_reports == nullptr)
goto out;
reset();
/* Initialize offsets and scales */
_accel_scale.x_offset = 0;
_accel_scale.x_scale = 1.0f;
_accel_scale.y_offset = 0;
_accel_scale.y_scale = 1.0f;
_accel_scale.z_offset = 0;
_accel_scale.z_scale = 1.0f;
_gyro_scale.x_offset = 0;
_gyro_scale.x_scale = 1.0f;
_gyro_scale.y_offset = 0;
_gyro_scale.y_scale = 1.0f;
_gyro_scale.z_offset = 0;
_gyro_scale.z_scale = 1.0f;
/* do CDev init for the gyro device node, keep it optional */
gyro_ret = _gyro->init();
/* fetch an initial set of measurements for advertisement */
measure();
if (gyro_ret != OK) {
_gyro_topic = -1;
} else {
gyro_report gr;
_gyro_reports->get(&gr);
_gyro_topic = orb_advertise(ORB_ID(sensor_gyro), &gr);
}
/* advertise accel topic */
accel_report ar;
_accel_reports->get(&ar);
_accel_topic = orb_advertise(ORB_ID(sensor_accel), &ar);
out:
return ret;
}
void MPU6000::reset()
{
// Chip reset
write_reg(MPUREG_PWR_MGMT_1, BIT_H_RESET);
up_udelay(10000);
// Wake up device and select GyroZ clock (better performance)
write_reg(MPUREG_PWR_MGMT_1, MPU_CLK_SEL_PLLGYROZ);
up_udelay(1000);
// Disable I2C bus (recommended on datasheet)
write_reg(MPUREG_USER_CTRL, BIT_I2C_IF_DIS);
up_udelay(1000);
// SAMPLE RATE
_set_sample_rate(_sample_rate);
usleep(1000);
// FS & DLPF FS=2000 deg/s, DLPF = 20Hz (low pass filter)
// was 90 Hz, but this ruins quality and does not improve the
// system response
_set_dlpf_filter(MPU6000_DEFAULT_ONCHIP_FILTER_FREQ);
usleep(1000);
// Gyro scale 2000 deg/s ()
write_reg(MPUREG_GYRO_CONFIG, BITS_FS_2000DPS);
usleep(1000);
// correct gyro scale factors
// scale to rad/s in SI units
// 2000 deg/s = (2000/180)*PI = 34.906585 rad/s
// scaling factor:
// 1/(2^15)*(2000/180)*PI
_gyro_range_scale = (0.0174532 / 16.4);//1.0f / (32768.0f * (2000.0f / 180.0f) * M_PI_F);
_gyro_range_rad_s = (2000.0f / 180.0f) * M_PI_F;
// product-specific scaling
switch (_product) {
case MPU6000ES_REV_C4:
case MPU6000ES_REV_C5:
case MPU6000_REV_C4:
case MPU6000_REV_C5:
// Accel scale 8g (4096 LSB/g)
// Rev C has different scaling than rev D
write_reg(MPUREG_ACCEL_CONFIG, 1 << 3);
break;
case MPU6000ES_REV_D6:
case MPU6000ES_REV_D7:
case MPU6000ES_REV_D8:
case MPU6000_REV_D6:
case MPU6000_REV_D7:
case MPU6000_REV_D8:
case MPU6000_REV_D9:
case MPU6000_REV_D10:
// default case to cope with new chip revisions, which
// presumably won't have the accel scaling bug
default:
// Accel scale 8g (4096 LSB/g)
write_reg(MPUREG_ACCEL_CONFIG, 2 << 3);
break;
}
// Correct accel scale factors of 4096 LSB/g
// scale to m/s^2 ( 1g = 9.81 m/s^2)
_accel_range_scale = (MPU6000_ONE_G / 4096.0f);
_accel_range_m_s2 = 8.0f * MPU6000_ONE_G;
usleep(1000);
// INT CFG => Interrupt on Data Ready
write_reg(MPUREG_INT_ENABLE, BIT_RAW_RDY_EN); // INT: Raw data ready
usleep(1000);
write_reg(MPUREG_INT_PIN_CFG, BIT_INT_ANYRD_2CLEAR); // INT: Clear on any read
usleep(1000);
// Oscillator set
// write_reg(MPUREG_PWR_MGMT_1,MPU_CLK_SEL_PLLGYROZ);
usleep(1000);
}
int
MPU6000::probe()
{
/* look for a product ID we recognise */
_product = read_reg(MPUREG_PRODUCT_ID);
// verify product revision
switch (_product) {
case MPU6000ES_REV_C4:
case MPU6000ES_REV_C5:
case MPU6000_REV_C4:
case MPU6000_REV_C5:
case MPU6000ES_REV_D6:
case MPU6000ES_REV_D7:
case MPU6000ES_REV_D8:
case MPU6000_REV_D6:
case MPU6000_REV_D7:
case MPU6000_REV_D8:
case MPU6000_REV_D9:
case MPU6000_REV_D10:
debug("ID 0x%02x", _product);
return OK;
}
debug("unexpected ID 0x%02x", _product);
return -EIO;
}
/*
set sample rate (approximate) - 1kHz to 5Hz, for both accel and gyro
*/
void
MPU6000::_set_sample_rate(uint16_t desired_sample_rate_hz)
{
uint8_t div = 1000 / desired_sample_rate_hz;
if(div>200) div=200;
if(div<1) div=1;
write_reg(MPUREG_SMPLRT_DIV, div-1);
_sample_rate = 1000 / div;
}
/*
set the DLPF filter frequency. This affects both accel and gyro.
*/
void
MPU6000::_set_dlpf_filter(uint16_t frequency_hz)
{
uint8_t filter;
/*
choose next highest filter frequency available
*/
if (frequency_hz <= 5) {
filter = BITS_DLPF_CFG_5HZ;
} else if (frequency_hz <= 10) {
filter = BITS_DLPF_CFG_10HZ;
} else if (frequency_hz <= 20) {
filter = BITS_DLPF_CFG_20HZ;
} else if (frequency_hz <= 42) {
filter = BITS_DLPF_CFG_42HZ;
} else if (frequency_hz <= 98) {
filter = BITS_DLPF_CFG_98HZ;
} else if (frequency_hz <= 188) {
filter = BITS_DLPF_CFG_188HZ;
} else if (frequency_hz <= 256) {
filter = BITS_DLPF_CFG_256HZ_NOLPF2;
} else {
filter = BITS_DLPF_CFG_2100HZ_NOLPF;
}
write_reg(MPUREG_CONFIG, filter);
}
ssize_t
MPU6000::read(struct file *filp, char *buffer, size_t buflen)
{
unsigned count = buflen / sizeof(accel_report);
/* buffer must be large enough */
if (count < 1)
return -ENOSPC;
/* if automatic measurement is not enabled, get a fresh measurement into the buffer */
if (_call_interval == 0) {
_accel_reports->flush();
measure();
}
/* if no data, error (we could block here) */
if (_accel_reports->empty())
return -EAGAIN;
/* copy reports out of our buffer to the caller */
accel_report *arp = reinterpret_cast<accel_report *>(buffer);
int transferred = 0;
while (count--) {
if (!_accel_reports->get(arp))
break;
transferred++;
arp++;
}
/* return the number of bytes transferred */
return (transferred * sizeof(accel_report));
}
int
MPU6000::self_test()
{
if (_reads == 0) {
measure();
}
/* return 0 on success, 1 else */
return (_reads > 0) ? 0 : 1;
}
int
MPU6000::accel_self_test()
{
if (self_test())
return 1;
/* inspect accel offsets */
if (fabsf(_accel_scale.x_offset) < 0.000001f)
return 1;
if (fabsf(_accel_scale.x_scale - 1.0f) > 0.4f || fabsf(_accel_scale.x_scale - 1.0f) < 0.000001f)
return 1;
if (fabsf(_accel_scale.y_offset) < 0.000001f)
return 1;
if (fabsf(_accel_scale.y_scale - 1.0f) > 0.4f || fabsf(_accel_scale.y_scale - 1.0f) < 0.000001f)
return 1;
if (fabsf(_accel_scale.z_offset) < 0.000001f)
return 1;
if (fabsf(_accel_scale.z_scale - 1.0f) > 0.4f || fabsf(_accel_scale.z_scale - 1.0f) < 0.000001f)
return 1;
return 0;
}
int
MPU6000::gyro_self_test()
{
if (self_test())
return 1;
/* evaluate gyro offsets, complain if offset -> zero or larger than 6 dps */
if (fabsf(_gyro_scale.x_offset) > 0.1f || fabsf(_gyro_scale.x_offset) < 0.000001f)
return 1;
if (fabsf(_gyro_scale.x_scale - 1.0f) > 0.3f)
return 1;
if (fabsf(_gyro_scale.y_offset) > 0.1f || fabsf(_gyro_scale.y_offset) < 0.000001f)
return 1;
if (fabsf(_gyro_scale.y_scale - 1.0f) > 0.3f)
return 1;
if (fabsf(_gyro_scale.z_offset) > 0.1f || fabsf(_gyro_scale.z_offset) < 0.000001f)
return 1;
if (fabsf(_gyro_scale.z_scale - 1.0f) > 0.3f)
return 1;
return 0;
}
ssize_t
MPU6000::gyro_read(struct file *filp, char *buffer, size_t buflen)
{
unsigned count = buflen / sizeof(gyro_report);
/* buffer must be large enough */
if (count < 1)
return -ENOSPC;
/* if automatic measurement is not enabled, get a fresh measurement into the buffer */
if (_call_interval == 0) {
_gyro_reports->flush();
measure();
}
/* if no data, error (we could block here) */
if (_gyro_reports->empty())
return -EAGAIN;
/* copy reports out of our buffer to the caller */
gyro_report *grp = reinterpret_cast<gyro_report *>(buffer);
int transferred = 0;
while (count--) {
if (!_gyro_reports->get(grp))
break;
transferred++;
grp++;
}
/* return the number of bytes transferred */
return (transferred * sizeof(gyro_report));
}
int
MPU6000::ioctl(struct file *filp, int cmd, unsigned long arg)
{
switch (cmd) {
case SENSORIOCRESET:
reset();
return OK;
case SENSORIOCSPOLLRATE: {
switch (arg) {
/* switching to manual polling */
case SENSOR_POLLRATE_MANUAL:
stop();
_call_interval = 0;
return OK;
/* external signalling not supported */
case SENSOR_POLLRATE_EXTERNAL:
/* zero would be bad */
case 0:
return -EINVAL;
/* set default/max polling rate */
case SENSOR_POLLRATE_MAX:
return ioctl(filp, SENSORIOCSPOLLRATE, 1000);
case SENSOR_POLLRATE_DEFAULT:
return ioctl(filp, SENSORIOCSPOLLRATE, MPU6000_ACCEL_DEFAULT_RATE);
/* adjust to a legal polling interval in Hz */
default: {
/* do we need to start internal polling? */
bool want_start = (_call_interval == 0);
/* convert hz to hrt interval via microseconds */
unsigned ticks = 1000000 / arg;
/* check against maximum sane rate */
if (ticks < 1000)
return -EINVAL;
// adjust filters
float cutoff_freq_hz = _accel_filter_x.get_cutoff_freq();
float sample_rate = 1.0e6f/ticks;
_accel_filter_x.set_cutoff_frequency(sample_rate, cutoff_freq_hz);
_accel_filter_y.set_cutoff_frequency(sample_rate, cutoff_freq_hz);
_accel_filter_z.set_cutoff_frequency(sample_rate, cutoff_freq_hz);
float cutoff_freq_hz_gyro = _gyro_filter_x.get_cutoff_freq();
_gyro_filter_x.set_cutoff_frequency(sample_rate, cutoff_freq_hz_gyro);
_gyro_filter_y.set_cutoff_frequency(sample_rate, cutoff_freq_hz_gyro);
_gyro_filter_z.set_cutoff_frequency(sample_rate, cutoff_freq_hz_gyro);
/* update interval for next measurement */
/* XXX this is a bit shady, but no other way to adjust... */
_call.period = _call_interval = ticks;
/* if we need to start the poll state machine, do it */
if (want_start)
start();
return OK;
}
}
}
case SENSORIOCGPOLLRATE:
if (_call_interval == 0)
return SENSOR_POLLRATE_MANUAL;
return 1000000 / _call_interval;
case SENSORIOCSQUEUEDEPTH: {
/* lower bound is mandatory, upper bound is a sanity check */
if ((arg < 1) || (arg > 100))
return -EINVAL;
irqstate_t flags = irqsave();
if (!_accel_reports->resize(arg)) {
irqrestore(flags);
return -ENOMEM;
}
irqrestore(flags);
return OK;
}
case SENSORIOCGQUEUEDEPTH:
return _accel_reports->size();
case ACCELIOCGSAMPLERATE:
return _sample_rate;
case ACCELIOCSSAMPLERATE:
_set_sample_rate(arg);
return OK;
case ACCELIOCGLOWPASS:
return _accel_filter_x.get_cutoff_freq();
case ACCELIOCSLOWPASS:
// XXX decide on relationship of both filters
// i.e. disable the on-chip filter
//_set_dlpf_filter((uint16_t)arg);
_accel_filter_x.set_cutoff_frequency(1.0e6f / _call_interval, arg);
_accel_filter_y.set_cutoff_frequency(1.0e6f / _call_interval, arg);
_accel_filter_z.set_cutoff_frequency(1.0e6f / _call_interval, arg);
return OK;
case ACCELIOCSSCALE:
{
/* copy scale, but only if off by a few percent */
struct accel_scale *s = (struct accel_scale *) arg;
float sum = s->x_scale + s->y_scale + s->z_scale;
if (sum > 2.0f && sum < 4.0f) {
memcpy(&_accel_scale, s, sizeof(_accel_scale));
return OK;
} else {
return -EINVAL;
}
}
case ACCELIOCGSCALE:
/* copy scale out */
memcpy((struct accel_scale *) arg, &_accel_scale, sizeof(_accel_scale));
return OK;
case ACCELIOCSRANGE:
/* XXX not implemented */
// XXX change these two values on set:
// _accel_range_scale = (9.81f / 4096.0f);
// _accel_range_m_s2 = 8.0f * 9.81f;
return -EINVAL;
case ACCELIOCGRANGE:
return (unsigned long)((_accel_range_m_s2)/MPU6000_ONE_G + 0.5f);
case ACCELIOCSELFTEST:
return accel_self_test();
default:
/* give it to the superclass */
return SPI::ioctl(filp, cmd, arg);
}
}
int
MPU6000::gyro_ioctl(struct file *filp, int cmd, unsigned long arg)
{
switch (cmd) {
/* these are shared with the accel side */
case SENSORIOCSPOLLRATE:
case SENSORIOCGPOLLRATE:
case SENSORIOCRESET:
return ioctl(filp, cmd, arg);
case SENSORIOCSQUEUEDEPTH: {
/* lower bound is mandatory, upper bound is a sanity check */
if ((arg < 1) || (arg > 100))
return -EINVAL;
irqstate_t flags = irqsave();
if (!_gyro_reports->resize(arg)) {
irqrestore(flags);
return -ENOMEM;
}
irqrestore(flags);
return OK;
}
case SENSORIOCGQUEUEDEPTH:
return _gyro_reports->size();
case GYROIOCGSAMPLERATE:
return _sample_rate;
case GYROIOCSSAMPLERATE:
_set_sample_rate(arg);
return OK;
case GYROIOCGLOWPASS:
return _gyro_filter_x.get_cutoff_freq();
case GYROIOCSLOWPASS:
_gyro_filter_x.set_cutoff_frequency(1.0e6f / _call_interval, arg);
_gyro_filter_y.set_cutoff_frequency(1.0e6f / _call_interval, arg);
_gyro_filter_z.set_cutoff_frequency(1.0e6f / _call_interval, arg);
// XXX check relation to the internal lowpass
//_set_dlpf_filter((uint16_t)arg);
return OK;
case GYROIOCSSCALE:
/* copy scale in */
memcpy(&_gyro_scale, (struct gyro_scale *) arg, sizeof(_gyro_scale));
return OK;
case GYROIOCGSCALE:
/* copy scale out */
memcpy((struct gyro_scale *) arg, &_gyro_scale, sizeof(_gyro_scale));
return OK;
case GYROIOCSRANGE:
/* XXX not implemented */
// XXX change these two values on set:
// _gyro_range_scale = xx
// _gyro_range_rad_s = xx
return -EINVAL;
case GYROIOCGRANGE:
return (unsigned long)(_gyro_range_rad_s * 180.0f / M_PI_F + 0.5f);
case GYROIOCSELFTEST:
return gyro_self_test();
default:
/* give it to the superclass */
return SPI::ioctl(filp, cmd, arg);
}
}
uint8_t
MPU6000::read_reg(unsigned reg)
{
uint8_t cmd[2];
cmd[0] = reg | DIR_READ;
// general register transfer at low clock speed
set_frequency(MPU6000_LOW_BUS_SPEED);
transfer(cmd, cmd, sizeof(cmd));
return cmd[1];
}
uint16_t
MPU6000::read_reg16(unsigned reg)
{
uint8_t cmd[3];
cmd[0] = reg | DIR_READ;
// general register transfer at low clock speed
set_frequency(MPU6000_LOW_BUS_SPEED);
transfer(cmd, cmd, sizeof(cmd));
return (uint16_t)(cmd[1] << 8) | cmd[2];
}
void
MPU6000::write_reg(unsigned reg, uint8_t value)
{
uint8_t cmd[2];
cmd[0] = reg | DIR_WRITE;
cmd[1] = value;
// general register transfer at low clock speed
set_frequency(MPU6000_LOW_BUS_SPEED);
transfer(cmd, nullptr, sizeof(cmd));
}
void
MPU6000::modify_reg(unsigned reg, uint8_t clearbits, uint8_t setbits)
{
uint8_t val;
val = read_reg(reg);
val &= ~clearbits;
val |= setbits;
write_reg(reg, val);
}
int
MPU6000::set_range(unsigned max_g)
{
#if 0
uint8_t rangebits;
float rangescale;
if (max_g > 16) {
return -ERANGE;
} else if (max_g > 8) { /* 16G */
rangebits = OFFSET_LSB1_RANGE_16G;
rangescale = 1.98;
} else if (max_g > 4) { /* 8G */
rangebits = OFFSET_LSB1_RANGE_8G;
rangescale = 0.99;
} else if (max_g > 3) { /* 4G */
rangebits = OFFSET_LSB1_RANGE_4G;
rangescale = 0.5;
} else if (max_g > 2) { /* 3G */
rangebits = OFFSET_LSB1_RANGE_3G;
rangescale = 0.38;
} else if (max_g > 1) { /* 2G */
rangebits = OFFSET_LSB1_RANGE_2G;
rangescale = 0.25;
} else { /* 1G */
rangebits = OFFSET_LSB1_RANGE_1G;
rangescale = 0.13;
}
/* adjust sensor configuration */
modify_reg(ADDR_OFFSET_LSB1, OFFSET_LSB1_RANGE_MASK, rangebits);
_range_scale = rangescale;
#endif
return OK;
}
void
MPU6000::start()
{
/* make sure we are stopped first */
stop();
/* discard any stale data in the buffers */
_accel_reports->flush();
_gyro_reports->flush();
/* start polling at the specified rate */
hrt_call_every(&_call, 1000, _call_interval, (hrt_callout)&MPU6000::measure_trampoline, this);
}
void
MPU6000::stop()
{
hrt_cancel(&_call);
}
void
MPU6000::measure_trampoline(void *arg)
{
MPU6000 *dev = reinterpret_cast<MPU6000 *>(arg);
/* make another measurement */
dev->measure();
}
void
MPU6000::measure()
{
#pragma pack(push, 1)
/**
* Report conversation within the MPU6000, including command byte and
* interrupt status.
*/
struct MPUReport {
uint8_t cmd;
uint8_t status;
uint8_t accel_x[2];
uint8_t accel_y[2];
uint8_t accel_z[2];
uint8_t temp[2];
uint8_t gyro_x[2];
uint8_t gyro_y[2];
uint8_t gyro_z[2];
} mpu_report;
#pragma pack(pop)
struct Report {
int16_t accel_x;
int16_t accel_y;
int16_t accel_z;
int16_t temp;
int16_t gyro_x;
int16_t gyro_y;
int16_t gyro_z;
} report;
/* start measuring */
perf_begin(_sample_perf);
/*
* Fetch the full set of measurements from the MPU6000 in one pass.
*/
mpu_report.cmd = DIR_READ | MPUREG_INT_STATUS;
// sensor transfer at high clock speed
set_frequency(MPU6000_HIGH_BUS_SPEED);
if (OK != transfer((uint8_t *)&mpu_report, ((uint8_t *)&mpu_report), sizeof(mpu_report)))
return;
/* count measurement */
_reads++;
/*
* Convert from big to little endian
*/
report.accel_x = int16_t_from_bytes(mpu_report.accel_x);
report.accel_y = int16_t_from_bytes(mpu_report.accel_y);
report.accel_z = int16_t_from_bytes(mpu_report.accel_z);
report.temp = int16_t_from_bytes(mpu_report.temp);
report.gyro_x = int16_t_from_bytes(mpu_report.gyro_x);
report.gyro_y = int16_t_from_bytes(mpu_report.gyro_y);
report.gyro_z = int16_t_from_bytes(mpu_report.gyro_z);
/*
* Swap axes and negate y
*/
int16_t accel_xt = report.accel_y;
int16_t accel_yt = ((report.accel_x == -32768) ? 32767 : -report.accel_x);
int16_t gyro_xt = report.gyro_y;
int16_t gyro_yt = ((report.gyro_x == -32768) ? 32767 : -report.gyro_x);
/*
* Apply the swap
*/
report.accel_x = accel_xt;
report.accel_y = accel_yt;
report.gyro_x = gyro_xt;
report.gyro_y = gyro_yt;
/*
* Report buffers.
*/
accel_report arb;
gyro_report grb;
/*
* Adjust and scale results to m/s^2.
*/
grb.timestamp = arb.timestamp = hrt_absolute_time();
grb.error_count = arb.error_count = 0; // not reported
/*
* 1) Scale raw value to SI units using scaling from datasheet.
* 2) Subtract static offset (in SI units)
* 3) Scale the statically calibrated values with a linear
* dynamically obtained factor
*
* Note: the static sensor offset is the number the sensor outputs
* at a nominally 'zero' input. Therefore the offset has to
* be subtracted.
*
* Example: A gyro outputs a value of 74 at zero angular rate
* the offset is 74 from the origin and subtracting
* 74 from all measurements centers them around zero.
*/
/* NOTE: Axes have been swapped to match the board a few lines above. */
arb.x_raw = report.accel_x;
arb.y_raw = report.accel_y;
arb.z_raw = report.accel_z;
float x_in_new = ((report.accel_x * _accel_range_scale) - _accel_scale.x_offset) * _accel_scale.x_scale;
float y_in_new = ((report.accel_y * _accel_range_scale) - _accel_scale.y_offset) * _accel_scale.y_scale;
float z_in_new = ((report.accel_z * _accel_range_scale) - _accel_scale.z_offset) * _accel_scale.z_scale;
arb.x = _accel_filter_x.apply(x_in_new);
arb.y = _accel_filter_y.apply(y_in_new);
arb.z = _accel_filter_z.apply(z_in_new);
arb.scaling = _accel_range_scale;
arb.range_m_s2 = _accel_range_m_s2;
arb.temperature_raw = report.temp;
arb.temperature = (report.temp) / 361.0f + 35.0f;
grb.x_raw = report.gyro_x;
grb.y_raw = report.gyro_y;
grb.z_raw = report.gyro_z;
float x_gyro_in_new = ((report.gyro_x * _gyro_range_scale) - _gyro_scale.x_offset) * _gyro_scale.x_scale;
float y_gyro_in_new = ((report.gyro_y * _gyro_range_scale) - _gyro_scale.y_offset) * _gyro_scale.y_scale;
float z_gyro_in_new = ((report.gyro_z * _gyro_range_scale) - _gyro_scale.z_offset) * _gyro_scale.z_scale;
grb.x = _gyro_filter_x.apply(x_gyro_in_new);
grb.y = _gyro_filter_y.apply(y_gyro_in_new);
grb.z = _gyro_filter_z.apply(z_gyro_in_new);
grb.scaling = _gyro_range_scale;
grb.range_rad_s = _gyro_range_rad_s;
grb.temperature_raw = report.temp;
grb.temperature = (report.temp) / 361.0f + 35.0f;
_accel_reports->force(&arb);
_gyro_reports->force(&grb);
/* notify anyone waiting for data */
poll_notify(POLLIN);
_gyro->parent_poll_notify();
/* and publish for subscribers */
orb_publish(ORB_ID(sensor_accel), _accel_topic, &arb);
if (_gyro_topic != -1) {
orb_publish(ORB_ID(sensor_gyro), _gyro_topic, &grb);
}
/* stop measuring */
perf_end(_sample_perf);
}
void
MPU6000::print_info()
{
perf_print_counter(_sample_perf);
printf("reads: %u\n", _reads);
_accel_reports->print_info("accel queue");
_gyro_reports->print_info("gyro queue");
}
MPU6000_gyro::MPU6000_gyro(MPU6000 *parent) :
CDev("MPU6000_gyro", GYRO_DEVICE_PATH),
_parent(parent)
{
}
MPU6000_gyro::~MPU6000_gyro()
{
}
void
MPU6000_gyro::parent_poll_notify()
{
poll_notify(POLLIN);
}
ssize_t
MPU6000_gyro::read(struct file *filp, char *buffer, size_t buflen)
{
return _parent->gyro_read(filp, buffer, buflen);
}
int
MPU6000_gyro::ioctl(struct file *filp, int cmd, unsigned long arg)
{
return _parent->gyro_ioctl(filp, cmd, arg);
}
/**
* Local functions in support of the shell command.
*/
namespace mpu6000
{
MPU6000 *g_dev;
void start();
void test();
void reset();
void info();
/**
* Start the driver.
*/
void
start()
{
int fd;
if (g_dev != nullptr)
/* if already started, the still command succeeded */
errx(0, "already started");
/* create the driver */
g_dev = new MPU6000(1 /* XXX magic number */, (spi_dev_e)PX4_SPIDEV_MPU);
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(ACCEL_DEVICE_PATH, O_RDONLY);
if (fd < 0)
goto fail;
if (ioctl(fd, SENSORIOCSPOLLRATE, SENSOR_POLLRATE_DEFAULT) < 0)
goto fail;
exit(0);
fail:
if (g_dev != nullptr) {
delete g_dev;
g_dev = nullptr;
}
errx(1, "driver start failed");
}
/**
* Perform some basic functional tests on the driver;
* make sure we can collect data from the sensor in polled
* and automatic modes.
*/
void
test()
{
accel_report a_report;
gyro_report g_report;
ssize_t sz;
/* get the driver */
int fd = open(ACCEL_DEVICE_PATH, O_RDONLY);
if (fd < 0)
err(1, "%s open failed (try 'mpu6000 start' if the driver is not running)",
ACCEL_DEVICE_PATH);
/* get the driver */
int fd_gyro = open(GYRO_DEVICE_PATH, O_RDONLY);
if (fd_gyro < 0)
err(1, "%s open failed", GYRO_DEVICE_PATH);
/* reset to manual polling */
if (ioctl(fd, SENSORIOCSPOLLRATE, SENSOR_POLLRATE_MANUAL) < 0)
err(1, "reset to manual polling");
/* do a simple demand read */
sz = read(fd, &a_report, sizeof(a_report));
if (sz != sizeof(a_report)) {
warnx("ret: %d, expected: %d", sz, sizeof(a_report));
err(1, "immediate acc read failed");
}
warnx("single read");
warnx("time: %lld", a_report.timestamp);
warnx("acc x: \t%8.4f\tm/s^2", (double)a_report.x);
warnx("acc y: \t%8.4f\tm/s^2", (double)a_report.y);
warnx("acc z: \t%8.4f\tm/s^2", (double)a_report.z);
warnx("acc x: \t%d\traw 0x%0x", (short)a_report.x_raw, (unsigned short)a_report.x_raw);
warnx("acc y: \t%d\traw 0x%0x", (short)a_report.y_raw, (unsigned short)a_report.y_raw);
warnx("acc z: \t%d\traw 0x%0x", (short)a_report.z_raw, (unsigned short)a_report.z_raw);
warnx("acc range: %8.4f m/s^2 (%8.4f g)", (double)a_report.range_m_s2,
(double)(a_report.range_m_s2 / MPU6000_ONE_G));
/* do a simple demand read */
sz = read(fd_gyro, &g_report, sizeof(g_report));
if (sz != sizeof(g_report)) {
warnx("ret: %d, expected: %d", sz, sizeof(g_report));
err(1, "immediate gyro read failed");
}
warnx("gyro x: \t% 9.5f\trad/s", (double)g_report.x);
warnx("gyro y: \t% 9.5f\trad/s", (double)g_report.y);
warnx("gyro z: \t% 9.5f\trad/s", (double)g_report.z);
warnx("gyro x: \t%d\traw", (int)g_report.x_raw);
warnx("gyro y: \t%d\traw", (int)g_report.y_raw);
warnx("gyro z: \t%d\traw", (int)g_report.z_raw);
warnx("gyro range: %8.4f rad/s (%d deg/s)", (double)g_report.range_rad_s,
(int)((g_report.range_rad_s / M_PI_F) * 180.0f + 0.5f));
warnx("temp: \t%8.4f\tdeg celsius", (double)a_report.temperature);
warnx("temp: \t%d\traw 0x%0x", (short)a_report.temperature_raw, (unsigned short)a_report.temperature_raw);
/* XXX add poll-rate tests here too */
reset();
errx(0, "PASS");
}
/**
* Reset the driver.
*/
void
reset()
{
int fd = open(ACCEL_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
mpu6000_main(int argc, char *argv[])
{
/*
* Start/load the driver.
*/
if (!strcmp(argv[1], "start"))
mpu6000::start();
/*
* Test the driver/device.
*/
if (!strcmp(argv[1], "test"))
mpu6000::test();
/*
* Reset the driver.
*/
if (!strcmp(argv[1], "reset"))
mpu6000::reset();
/*
* Print driver information.
*/
if (!strcmp(argv[1], "info"))
mpu6000::info();
errx(1, "unrecognized command, try 'start', 'test', 'reset' or 'info'");
}
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