AP_OpticalFlow - added set_orientation

git-svn-id: https://arducopter.googlecode.com/svn/trunk@2245 f9c3cf11-9bcb-44bc-f272-b75c42450872
This commit is contained in:
rmackay9@yahoo.com 2011-05-11 12:49:19 +00:00
parent 57338c488a
commit 4ce3cb9be8
5 changed files with 205 additions and 57 deletions

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@ -10,13 +10,24 @@
#include "AP_OpticalFlow.h"
AP_OpticalFlow::AP_OpticalFlow() : x(0),y(0),surface_quality(0),dx(0),dy(0)
AP_OpticalFlow::AP_OpticalFlow() : raw_dx(0),raw_dy(0),x(0),y(0),surface_quality(0),dx(0),dy(0),last_update(0),field_of_view(1),scaler(0),num_pixels(0)
{
}
// init - initCommAPI parameter controls whether I2C/SPI interface is initialised (set to false if other devices are on the I2C/SPI bus and have already initialised the interface)
void AP_OpticalFlow::init(boolean initCommAPI)
bool
AP_OpticalFlow::init(bool initCommAPI)
{
_orientation_matrix = Matrix3f(1,0,0,0,1,0,0,0,1);
update_conversion_factors();
return true; // just return true by default
}
// set_orientation - Rotation vector to transform sensor readings to the body frame.
void
AP_OpticalFlow::set_orientation(const Matrix3f &rotation_matrix)
{
_orientation_matrix = rotation_matrix;
}
// read latest values from sensor and fill in x,y and totals
@ -25,11 +36,71 @@ int AP_OpticalFlow::read()
}
// reads a value from the sensor (will be sensor specific)
byte AP_OpticalFlow::read_register(byte address)
byte
AP_OpticalFlow::read_register(byte address)
{
}
// writes a value to one of the sensor's register (will be sensor specific)
void AP_OpticalFlow::write_register(byte address, byte value)
void
AP_OpticalFlow::write_register(byte address, byte value)
{
}
// rotate raw values to arrive at final x,y,dx and dy values
void
AP_OpticalFlow::apply_orientation_matrix()
{
Vector3f rot_vector;
// next rotate dx and dy
rot_vector = _orientation_matrix * Vector3f(raw_dx,raw_dy,0);
dx = rot_vector.x;
dy = rot_vector.y;
// add rotated values to totals (perhaps this is pointless as we need to take into account yaw, roll, pitch)
x += dx;
y += dy;
}
// updatse conversion factors that are dependent upon field_of_view
void
AP_OpticalFlow::update_conversion_factors()
{
conv_factor = (1.0/(float)(num_pixels*scaler))*2.0*tan(field_of_view/2.0); // multiply this number by altitude and pixel change to get horizontal move (in same units as altitude)
radians_to_pixels = (num_pixels*scaler) / field_of_view;
}
// updates internal lon and lat with estimation based on optical flow
void
AP_OpticalFlow::get_position(float roll, float pitch, float yaw, float altitude)
{
float diff_roll = roll - _last_roll;
float diff_pitch = pitch - _last_pitch;
float avg_altitude = (altitude + _last_altitude)/2;
float exp_change_x, exp_change_y;
float change_x, change_y;
float x_cm, y_cm;
int i;
// calculate expected x,y diff due to roll and pitch change
exp_change_x = diff_roll * radians_to_pixels;
exp_change_y = diff_pitch * radians_to_pixels;
// real estimated raw change from mouse
change_x = dx - exp_change_x;
change_y = dy - exp_change_y;
// convert raw change to horizontal movement in cm
x_cm = change_x * avg_altitude * conv_factor;
y_cm = change_y * avg_altitude * conv_factor;
// use yaw to convert x and y into lon and lat
lng += y_cm * cos(yaw) + x_cm * sin(yaw);
lat += x_cm * cos(yaw) + y_cm * sin(yaw);
// capture roll and pitch for next iteration
_last_roll = roll;
_last_pitch = pitch;
_last_altitude = altitude;
}

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@ -18,29 +18,52 @@
*/
#include <stdlib.h>
#include <inttypes.h>
#include <math.h>
#include "WConstants.h"
#include "WProgram.h"
#include <AP_Math.h>
// return value definition
#define OPTICALFLOW_FAIL 0
#define OPTICALFLOW_SUCCESS 1
// standard rotation matrices
#define AP_OPTICALFLOW_ROTATION_NONE Matrix3f(1, 0, 0, 0, 1, 0, 0 ,0, 1)
#define AP_OPTICALFLOW_ROTATION_YAW_45 Matrix3f(0.70710678, -0.70710678, 0, 0.70710678, 0.70710678, 0, 0, 0, 1)
#define AP_OPTICALFLOW_ROTATION_YAW_90 Matrix3f(0, -1, 0, 1, 0, 0, 0, 0, 1)
#define AP_OPTICALFLOW_ROTATION_YAW_135 Matrix3f(-0.70710678, -0.70710678, 0, 0.70710678, -0.70710678, 0, 0, 0, 1)
#define AP_OPTICALFLOW_ROTATION_YAW_180 Matrix3f(-1, 0, 0, 0, -1, 0, 0, 0, 1)
#define AP_OPTICALFLOW_ROTATION_YAW_225 Matrix3f(-0.70710678, 0.70710678, 0, -0.70710678, -0.70710678, 0, 0, 0, 1)
#define AP_OPTICALFLOW_ROTATION_YAW_270 Matrix3f(0, 1, 0, -1, 0, 0, 0, 0, 1)
#define AP_OPTICALFLOW_ROTATION_YAW_315 Matrix3f(0.70710678, 0.70710678, 0, -0.70710678, 0.70710678, 0, 0, 0, 1)
class AP_OpticalFlow
{
public:
int x, y; // total x,y position
int dx, dy; // change in x and y position
public:
int raw_dx, raw_dy; // raw sensor change in x and y position (i.e. unrotated)
int surface_quality; // image quality (below 15 you really can't trust the x,y values returned)
int x,y; // total x,y position
int dx,dy; // rotated change in x and y position
unsigned long lng, lat; // position
unsigned long last_update; // millis() time of last update
float field_of_view; // field of view in Radians
float scaler; // number returned from sensor when moved one pixel
int num_pixels; // number of pixels of resolution in the sensor
public:
AP_OpticalFlow(); // Constructor
virtual void init(boolean initCommAPI = true); // parameter controls whether I2C/SPI interface is initialised (set to false if other devices are on the I2C/SPI bus and have already initialised the interface)
virtual int read(); // read latest values from sensor and fill in x,y and totals
virtual bool init(bool initCommAPI = true); // parameter controls whether I2C/SPI interface is initialised (set to false if other devices are on the I2C/SPI bus and have already initialised the interface)
virtual byte read_register(byte address);
virtual void write_register(byte address, byte value);
virtual void set_orientation(const Matrix3f &rotation_matrix); // Rotation vector to transform sensor readings to the body frame.
virtual void set_field_of_view(const float fov) { field_of_view = fov; update_conversion_factors(); }; // sets field of view of sensor
virtual int read(); // read latest values from sensor and fill in x,y and totals
virtual void get_position(float roll, float pitch, float yaw, float altitude); // updates internal lon and lat with estimation based on optical flow
private:
protected:
Matrix3f _orientation_matrix;
float conv_factor; // multiply this number by altitude and pixel change to get horizontal move (in same units as altitude)
float radians_to_pixels;
float _last_roll, _last_pitch, _last_yaw, _last_altitude;
virtual void apply_orientation_matrix(); // rotate raw values to arrive at final x,y,dx and dy values
virtual void update_conversion_factors();
};
#include "AP_OpticalFlow_ADNS3080.h"

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@ -24,7 +24,7 @@
*/
#include "AP_OpticalFlow_ADNS3080.h"
#include <avr/interrupt.h>
#include "WProgram.h"
#include "../SPI/SPI.h"
#define AP_SPI_TIMEOUT 1000
@ -40,12 +40,16 @@ union NumericIntType
// Constructors ////////////////////////////////////////////////////////////////
AP_OpticalFlow_ADNS3080::AP_OpticalFlow_ADNS3080()
{
num_pixels = ADNS3080_PIXELS_X;
field_of_view = AP_OPTICALFLOW_ADNS3080_12_FOV;
scaler = AP_OPTICALFLOW_ADNS3080_SCALER;
}
// Public Methods //////////////////////////////////////////////////////////////
// init - initialise sensor
// initCommAPI parameter controls whether SPI interface is initialised (set to false if other devices are on the SPI bus and have already initialised the interface)
void AP_OpticalFlow_ADNS3080::init(boolean initCommAPI)
bool
AP_OpticalFlow_ADNS3080::init(bool initCommAPI)
{
pinMode(AP_SPI_DATAOUT,OUTPUT);
pinMode(AP_SPI_DATAIN,INPUT);
@ -70,7 +74,8 @@ void AP_OpticalFlow_ADNS3080::init(boolean initCommAPI)
//
// backup_spi_settings - checks current SPI settings (clock speed, etc), sets values to what we need
//
byte AP_OpticalFlow_ADNS3080::backup_spi_settings()
byte
AP_OpticalFlow_ADNS3080::backup_spi_settings()
{
// store current spi values
orig_spi_settings_spcr = SPCR & (DORD | CPOL | CPHA);
@ -85,7 +90,8 @@ byte AP_OpticalFlow_ADNS3080::backup_spi_settings()
}
// restore_spi_settings - restores SPI settings (clock speed, etc) to what their values were before the sensor used the bus
byte AP_OpticalFlow_ADNS3080::restore_spi_settings()
byte
AP_OpticalFlow_ADNS3080::restore_spi_settings()
{
byte temp;
@ -105,7 +111,8 @@ byte AP_OpticalFlow_ADNS3080::restore_spi_settings()
}
// Read a register from the sensor
byte AP_OpticalFlow_ADNS3080::read_register(byte address)
byte
AP_OpticalFlow_ADNS3080::read_register(byte address)
{
byte result = 0, junk = 0;
@ -132,7 +139,8 @@ byte AP_OpticalFlow_ADNS3080::read_register(byte address)
}
// write a value to one of the sensor's registers
void AP_OpticalFlow_ADNS3080::write_register(byte address, byte value)
void
AP_OpticalFlow_ADNS3080::write_register(byte address, byte value)
{
byte junk = 0;
@ -157,7 +165,8 @@ void AP_OpticalFlow_ADNS3080::write_register(byte address, byte value)
}
// reset sensor by holding a pin high (or is it low?) for 10us.
void AP_OpticalFlow_ADNS3080::reset()
void
AP_OpticalFlow_ADNS3080::reset()
{
digitalWrite(ADNS3080_RESET,HIGH); // reset sensor
delayMicroseconds(10);
@ -165,35 +174,40 @@ void AP_OpticalFlow_ADNS3080::reset()
}
// read latest values from sensor and fill in x,y and totals
int AP_OpticalFlow_ADNS3080::read()
int
AP_OpticalFlow_ADNS3080::read()
{
surface_quality = (unsigned int)read_register(ADNS3080_SQUAL);
delayMicroseconds(50); // small delay
// check for movement, update x,y values
if( (read_register(ADNS3080_MOTION) & 0x80) != 0 ) {
dx = ((char)read_register(ADNS3080_DELTA_X));
raw_dx = ((char)read_register(ADNS3080_DELTA_X));
delayMicroseconds(50); // small delay
dy = ((char)read_register(ADNS3080_DELTA_Y));
x+=dx;
y+=dy;
raw_dy = ((char)read_register(ADNS3080_DELTA_Y));
_motion = true;
}else{
dx = 0;
dy = 0;
raw_dx = 0;
raw_dy = 0;
}
last_update = millis();
apply_orientation_matrix();
return OPTICALFLOW_SUCCESS;
}
// get_led_always_on - returns true if LED is always on, false if only on when required
boolean AP_OpticalFlow_ADNS3080::get_led_always_on()
bool
AP_OpticalFlow_ADNS3080::get_led_always_on()
{
return ( (read_register(ADNS3080_CONFIGURATION_BITS) & 0x40) > 0 );
}
// set_led_always_on - set parameter to true if you want LED always on, otherwise false for only when required
void AP_OpticalFlow_ADNS3080::set_led_always_on( boolean alwaysOn )
void
AP_OpticalFlow_ADNS3080::set_led_always_on( bool alwaysOn )
{
byte regVal = read_register(ADNS3080_CONFIGURATION_BITS);
regVal = regVal & 0xBf | (alwaysOn << 6);
@ -202,7 +216,8 @@ void AP_OpticalFlow_ADNS3080::set_led_always_on( boolean alwaysOn )
}
// returns resolution (either 400 or 1200 counts per inch)
int AP_OpticalFlow_ADNS3080::get_resolution()
int
AP_OpticalFlow_ADNS3080::get_resolution()
{
if( (read_register(ADNS3080_CONFIGURATION_BITS) & 0x10) == 0 )
return 400;
@ -211,7 +226,8 @@ int AP_OpticalFlow_ADNS3080::get_resolution()
}
// set parameter to 400 or 1200 counts per inch
void AP_OpticalFlow_ADNS3080::set_resolution(int resolution)
void
AP_OpticalFlow_ADNS3080::set_resolution(int resolution)
{
byte regVal = read_register(ADNS3080_CONFIGURATION_BITS);
@ -226,7 +242,8 @@ void AP_OpticalFlow_ADNS3080::set_resolution(int resolution)
}
// get_frame_rate_auto - return whether frame rate is set to "auto" or manual
boolean AP_OpticalFlow_ADNS3080::get_frame_rate_auto()
bool
AP_OpticalFlow_ADNS3080::get_frame_rate_auto()
{
byte regVal = read_register(ADNS3080_EXTENDED_CONFIG);
if( regVal & 0x01 > 0 ) {
@ -237,7 +254,8 @@ boolean AP_OpticalFlow_ADNS3080::get_frame_rate_auto()
}
// set_frame_rate_auto - set frame rate to auto (true) or manual (false)
void AP_OpticalFlow_ADNS3080::set_frame_rate_auto(boolean auto_frame_rate)
void
AP_OpticalFlow_ADNS3080::set_frame_rate_auto(bool auto_frame_rate)
{
byte regVal = read_register(ADNS3080_EXTENDED_CONFIG);
delayMicroseconds(50); // small delay
@ -258,7 +276,8 @@ void AP_OpticalFlow_ADNS3080::set_frame_rate_auto(boolean auto_frame_rate)
}
// get frame period
unsigned int AP_OpticalFlow_ADNS3080::get_frame_period()
unsigned int
AP_OpticalFlow_ADNS3080::get_frame_period()
{
NumericIntType aNum;
aNum.byteValue[1] = read_register(ADNS3080_FRAME_PERIOD_UPPER);
@ -268,7 +287,8 @@ unsigned int AP_OpticalFlow_ADNS3080::get_frame_period()
}
// set frame period
void AP_OpticalFlow_ADNS3080::set_frame_period(unsigned int period)
void
AP_OpticalFlow_ADNS3080::set_frame_period(unsigned int period)
{
NumericIntType aNum;
aNum.uintValue = period;
@ -284,14 +304,16 @@ void AP_OpticalFlow_ADNS3080::set_frame_period(unsigned int period)
}
unsigned int AP_OpticalFlow_ADNS3080::get_frame_rate()
unsigned int
AP_OpticalFlow_ADNS3080::get_frame_rate()
{
unsigned long clockSpeed = ADNS3080_CLOCK_SPEED;
unsigned int rate = clockSpeed / get_frame_period();
return rate;
}
void AP_OpticalFlow_ADNS3080::set_frame_rate(unsigned int rate)
void
AP_OpticalFlow_ADNS3080::set_frame_rate(unsigned int rate)
{
unsigned long clockSpeed = ADNS3080_CLOCK_SPEED;
unsigned int period = (unsigned int)(clockSpeed / (unsigned long)rate);
@ -300,7 +322,8 @@ void AP_OpticalFlow_ADNS3080::set_frame_rate(unsigned int rate)
}
// get_shutter_speed_auto - returns true if shutter speed is adjusted automatically, false if manual
boolean AP_OpticalFlow_ADNS3080::get_shutter_speed_auto()
bool
AP_OpticalFlow_ADNS3080::get_shutter_speed_auto()
{
byte regVal = read_register(ADNS3080_EXTENDED_CONFIG);
if( (regVal & 0x02) > 0 ) {
@ -311,7 +334,8 @@ boolean AP_OpticalFlow_ADNS3080::get_shutter_speed_auto()
}
// set_shutter_speed_auto - set shutter speed to auto (true), or manual (false)
void AP_OpticalFlow_ADNS3080::set_shutter_speed_auto(boolean auto_shutter_speed)
void
AP_OpticalFlow_ADNS3080::set_shutter_speed_auto(bool auto_shutter_speed)
{
byte regVal = read_register(ADNS3080_EXTENDED_CONFIG);
delayMicroseconds(50); // small delay
@ -333,7 +357,8 @@ void AP_OpticalFlow_ADNS3080::set_shutter_speed_auto(boolean auto_shutter_speed)
}
// get_shutter_speed_auto - returns true if shutter speed is adjusted automatically, false if manual
unsigned int AP_OpticalFlow_ADNS3080::get_shutter_speed()
unsigned int
AP_OpticalFlow_ADNS3080::get_shutter_speed()
{
NumericIntType aNum;
aNum.byteValue[1] = read_register(ADNS3080_SHUTTER_UPPER);
@ -344,7 +369,8 @@ unsigned int AP_OpticalFlow_ADNS3080::get_shutter_speed()
// set_shutter_speed_auto - set shutter speed to auto (true), or manual (false)
unsigned int AP_OpticalFlow_ADNS3080::set_shutter_speed(unsigned int shutter_speed)
unsigned int
AP_OpticalFlow_ADNS3080::set_shutter_speed(unsigned int shutter_speed)
{
NumericIntType aNum;
aNum.uintValue = shutter_speed;
@ -374,7 +400,8 @@ unsigned int AP_OpticalFlow_ADNS3080::set_shutter_speed(unsigned int shutter_spe
}
// clear_motion - will cause the Delta_X, Delta_Y, and internal motion registers to be cleared
void AP_OpticalFlow_ADNS3080::clear_motion()
void
AP_OpticalFlow_ADNS3080::clear_motion()
{
write_register(ADNS3080_MOTION_CLEAR,0xFF); // writing anything to this register will clear the sensor's motion registers
x = 0;
@ -385,10 +412,11 @@ void AP_OpticalFlow_ADNS3080::clear_motion()
}
// get_pixel_data - captures an image from the sensor and stores it to the pixe_data array
int AP_OpticalFlow_ADNS3080::print_pixel_data(HardwareSerial *serPort)
int
AP_OpticalFlow_ADNS3080::print_pixel_data(Stream *serPort)
{
int i,j;
boolean isFirstPixel = true;
bool isFirstPixel = true;
byte regValue;
byte pixelValue;

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@ -1,8 +1,27 @@
#ifndef AP_OPTICALFLOW_ADNS3080_H
#define AP_OPTICALFLOW_ADNS3080_H
#include <AP_Math.h>
#include <Stream.h>
#include "AP_OpticalFlow.h"
#include "HardwareSerial.h"
// orientations for ADNS3080 sensor
#define AP_OPTICALFLOW_ADNS3080_PINS_FORWARD AP_OPTICALFLOW_ROTATION_YAW_180
#define AP_OPTICALFLOW_ADNS3080_PINS_FORWARD_RIGHT AP_OPTICALFLOW_ROTATION_YAW_135
#define AP_OPTICALFLOW_ADNS3080_PINS_RIGHT AP_OPTICALFLOW_ROTATION_YAW_90
#define AP_OPTICALFLOW_ADNS3080_PINS_BACK_RIGHT AP_OPTICALFLOW_ROTATION_YAW_45
#define AP_OPTICALFLOW_ADNS3080_PINS_BACK AP_OPTICALFLOW_ROTATION_NONE
#define AP_OPTICALFLOW_ADNS3080_PINS_BACK_LEFT AP_OPTICALFLOW_ROTATION_YAW_315
#define AP_OPTICALFLOW_ADNS3080_PINS_LEFT AP_OPTICALFLOW_ROTATION_YAW_270
#define AP_OPTICALFLOW_ADNS3080_PINS_FORWARD_LEFT AP_OPTICALFLOW_ROTATION_YAW_225
// field of view of ADNS3080 sensor lenses
#define AP_OPTICALFLOW_ADNS3080_04_FOV 80
#define AP_OPTICALFLOW_ADNS3080_08_FOV 50
#define AP_OPTICALFLOW_ADNS3080_12_FOV 20
// scaler - value returned when sensor is moved equivalent of 1 pixel
#define AP_OPTICALFLOW_ADNS3080_SCALER 10.5
// We use Serial Port 2 in SPI Mode
#define AP_SPI_DATAIN 50 // MISO // PB3
@ -71,27 +90,27 @@ class AP_OpticalFlow_ADNS3080 : public AP_OpticalFlow
byte backup_spi_settings();
byte restore_spi_settings();
boolean _motion; // true if there has been motion
bool _motion; // true if there has been motion
public:
AP_OpticalFlow_ADNS3080(); // Constructor
void init(boolean initCommAPI = true); // parameter controls whether I2C/SPI interface is initialised (set to false if other devices are on the I2C/SPI bus and have already initialised the interface)
bool init(bool initCommAPI = true); // parameter controls whether I2C/SPI interface is initialised (set to false if other devices are on the I2C/SPI bus and have already initialised the interface)
byte read_register(byte address);
void write_register(byte address, byte value);
void reset(); // reset sensor by holding a pin high (or is it low?) for 10us.
int read(); // read latest values from sensor and fill in x,y and totals, return OPTICALFLOW_SUCCESS on successful read
// ADNS3080 specific features
boolean motion() { if( _motion ) { _motion = false; return true; }else{ return false; } } // return true if there has been motion since the last time this was called
bool motion() { if( _motion ) { _motion = false; return true; }else{ return false; } } // return true if there has been motion since the last time this was called
boolean get_led_always_on(); // returns true if LED is always on, false if only on when required
void set_led_always_on( boolean alwaysOn ); // set parameter to true if you want LED always on, otherwise false for only when required
bool get_led_always_on(); // returns true if LED is always on, false if only on when required
void set_led_always_on( bool alwaysOn ); // set parameter to true if you want LED always on, otherwise false for only when required
int get_resolution(); // returns resolution (either 400 or 1200 counts per inch)
void set_resolution(int resolution); // set parameter to 400 or 1200 counts per inch
boolean get_frame_rate_auto(); // get_frame_rate_auto - return true if frame rate is set to "auto", false if manual
void set_frame_rate_auto(boolean auto_frame_rate); // set_frame_rate_auto(boolean) - set frame rate to auto (true), or manual (false)
bool get_frame_rate_auto(); // get_frame_rate_auto - return true if frame rate is set to "auto", false if manual
void set_frame_rate_auto(bool auto_frame_rate); // set_frame_rate_auto(bool) - set frame rate to auto (true), or manual (false)
unsigned int get_frame_period(); // get_frame_period -
void set_frame_period(unsigned int period);
@ -99,15 +118,15 @@ class AP_OpticalFlow_ADNS3080 : public AP_OpticalFlow
unsigned int get_frame_rate();
void set_frame_rate(unsigned int rate);
boolean get_shutter_speed_auto(); // get_shutter_speed_auto - returns true if shutter speed is adjusted automatically, false if manual
void set_shutter_speed_auto(boolean auto_shutter_speed); // set_shutter_speed_auto - set shutter speed to auto (true), or manual (false)
bool get_shutter_speed_auto(); // get_shutter_speed_auto - returns true if shutter speed is adjusted automatically, false if manual
void set_shutter_speed_auto(bool auto_shutter_speed); // set_shutter_speed_auto - set shutter speed to auto (true), or manual (false)
unsigned int get_shutter_speed();
unsigned int set_shutter_speed(unsigned int shutter_speed);
void clear_motion(); // will cause the x,y, dx, dy, and the sensor's motion registers to be cleared
int print_pixel_data(HardwareSerial *serPort); // dumps a 30x30 image to the Serial port
int print_pixel_data(Stream *serPort); // dumps a 30x30 image to the Serial port
};
#endif

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@ -3,7 +3,7 @@
Code by Randy Mackay. DIYDrones.com
*/
#include <avr/interrupt.h>
#include <AP_Math.h> // ArduPilot Mega Vector/Matrix math Library
#include <SPI.h> // Arduino SPI library
#include "AP_OpticalFlow.h" // ArduCopter OpticalFlow Library
@ -17,6 +17,8 @@ void setup()
delay(1000);
flowSensor.init(); // flowSensor initialization
flowSensor.set_orientation(AP_OPTICALFLOW_ADNS3080_PINS_FORWARD);
flowSensor.set_field_of_view(AP_OPTICALFLOW_ADNS3080_12_FOV);
delay(1000);
}
@ -293,6 +295,7 @@ void display_motion()
while( !Serial.available() ) {
flowSensor.read();
flowSensor.get_position(0,0,0,100);
// x,y,squal
//if( flowSensor.motion() || first_time ) {
@ -306,6 +309,10 @@ void display_motion()
Serial.print(flowSensor.dy,DEC);
Serial.print("\tsqual:");
Serial.print(flowSensor.surface_quality,DEC);
Serial.print("\tlat:");
Serial.print(flowSensor.lat,DEC);
Serial.print("\tlng:");
Serial.print(flowSensor.lng,DEC);
Serial.println();
first_time = false;
//}