Alvaro Cassinelli / Mbed 2 deprecated laserUI

Laser Sensing Display for UI interfaces in the real world

Dependencies:   mbed

Fork of skinGames_forktest by Alvaro Cassinelli

hardwareIO/lockin.h@31:5f039cbddee8, 2012-09-23 (annotated)

Committer:
mbedalvaro
Date:
Sun Sep 23 10:11:43 2012 +0000
Revision:
31:5f039cbddee8
Child:
34:1244fa3f2559
this is quite nice, but  I am going to make a deep modification of the bouncing principle: instead of depending on the penetration, it will just be a factor over the speed (perfect elastic bouncing being factorElastic=1, and perfectly absorption=0);

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbedalvaro 31:5f039cbddee8 1 #ifndef MBED_LOCKIN_H
mbedalvaro 31:5f039cbddee8 2 #define MBED_LOCKIN_H
mbedalvaro 31:5f039cbddee8 3
mbedalvaro 31:5f039cbddee8 4 #include "mbed.h"
mbedalvaro 31:5f039cbddee8 5 #include "adc.h"
mbedalvaro 31:5f039cbddee8 6
mbedalvaro 31:5f039cbddee8 7 #define MBEDFREQUENCY 96000 //frequency of the mBed in KHz
mbedalvaro 31:5f039cbddee8 8
mbedalvaro 31:5f039cbddee8 9 //#define I_Volts_SAT 5 // this is 5V (the saturation voltage for the APD+LockIn+ADC, being it the arduino (when in normal mode) or the SPI. This saturation voltage could be different for each mode!?
mbedalvaro 31:5f039cbddee8 10
mbedalvaro 31:5f039cbddee8 11 #define LOCKIN_ADC_PIN p18 //ADC pin : connect to lockin "output"
mbedalvaro 31:5f039cbddee8 12
mbedalvaro 31:5f039cbddee8 13 #define LOCKIN_REF_PIN p23 //PWM pin : connect to lockin reference signal.
mbedalvaro 31:5f039cbddee8 14 #define LOCKIN_LASER_PIN p25 //PWM pin : connect to laser control - note: the red laser by default, but could be a fourth IR laser...
mbedalvaro 31:5f039cbddee8 15 // p21 to p25 are used by the PWM timers even if only 2 pin are connected to the circuit
mbedalvaro 31:5f039cbddee8 16
mbedalvaro 31:5f039cbddee8 17 #define BUFFER_SIZE 15
mbedalvaro 31:5f039cbddee8 18 #define BUFFER_SIZE_MEDIAN 5
mbedalvaro 31:5f039cbddee8 19 #define DELAY_BUFFER_MEDIAN 0
mbedalvaro 31:5f039cbddee8 20
mbedalvaro 31:5f039cbddee8 21
mbedalvaro 31:5f039cbddee8 22 class Lockin {
mbedalvaro 31:5f039cbddee8 23 public:
mbedalvaro 31:5f039cbddee8 24 // default constructor (untouched!)
mbedalvaro 31:5f039cbddee8 25 // Lockin();
mbedalvaro 31:5f039cbddee8 26
mbedalvaro 31:5f039cbddee8 27 // initialization of object modes (could have parameters):
mbedalvaro 31:5f039cbddee8 28 void init();
mbedalvaro 31:5f039cbddee8 29
mbedalvaro 31:5f039cbddee8 30 void initPWM(); //setup the laser and reference signal used by the lockin
mbedalvaro 31:5f039cbddee8 31 void setPWMFrequency(float freq); //change the shared period of the pwm signals
mbedalvaro 31:5f039cbddee8 32 void setLaserPhaseShift(float phaseShift); //change the phase shift of the laser (from 0 to 1)
mbedalvaro 31:5f039cbddee8 33 void setLockinPhaseShift(float phaseShift); //change the phase shift of the lock-in (from 0 to 1)
mbedalvaro 31:5f039cbddee8 34 //future works:
mbedalvaro 31:5f039cbddee8 35 //add function to change frequency or offset with a potentiometer for exemple
mbedalvaro 31:5f039cbddee8 36 //or scan the best frequency...
mbedalvaro 31:5f039cbddee8 37
mbedalvaro 31:5f039cbddee8 38 void setLaserPower(bool power); //change PWM settings to turn on/off the laser
mbedalvaro 31:5f039cbddee8 39
mbedalvaro 31:5f039cbddee8 40
mbedalvaro 31:5f039cbddee8 41 unsigned short getSmoothValue(); //return the average of the value stored on the buffer
mbedalvaro 31:5f039cbddee8 42 unsigned short getLastValue(); //return the last conversion of the ADC
mbedalvaro 31:5f039cbddee8 43 unsigned short getMedianValue(); //return the median value of the buffer
mbedalvaro 31:5f039cbddee8 44 //it is just a begining; we can add more complex method for denoising for exemple
mbedalvaro 31:5f039cbddee8 45 //maybe, needs function to start and stop the lockin
mbedalvaro 31:5f039cbddee8 46
mbedalvaro 31:5f039cbddee8 47 void clearBuffer();
mbedalvaro 31:5f039cbddee8 48
mbedalvaro 31:5f039cbddee8 49 //can be private
mbedalvaro 31:5f039cbddee8 50 //void catchInterupt(uint32_t value);
mbedalvaro 31:5f039cbddee8 51
mbedalvaro 31:5f039cbddee8 52 //variables
mbedalvaro 31:5f039cbddee8 53 unsigned short buffer[BUFFER_SIZE]; // does not need to be a float - in fact values are from 0 to 4096 (i.e.,
mbedalvaro 31:5f039cbddee8 54 //unsigned short int buffer[BUFFER_SIZE]; // this is two bytes (0 to 65535)
mbedalvaro 31:5f039cbddee8 55 unsigned short orderedBuffer[BUFFER_SIZE_MEDIAN]; // for computation of the MEDIAN value
mbedalvaro 31:5f039cbddee8 56 int buffer_pos;
mbedalvaro 31:5f039cbddee8 57
mbedalvaro 31:5f039cbddee8 58 float refFrequency; // frequency of sensing laser and lock-in (in KHz)
mbedalvaro 31:5f039cbddee8 59 //Phase shift of the pwm signals (from 0 to 1):
mbedalvaro 31:5f039cbddee8 60 //it corresponds to a percentage of the half of a period
mbedalvaro 31:5f039cbddee8 61 //(no phase shift ==> 0% / 90deg phase shift ==> 100%)
mbedalvaro 31:5f039cbddee8 62 float phaseShiftLaser; // phase shift of the sensing laser
mbedalvaro 31:5f039cbddee8 63 float phaseShiftLockin; // phase shift of the lock-in reference
mbedalvaro 31:5f039cbddee8 64
mbedalvaro 31:5f039cbddee8 65 int refFreq; //frequency of the lockin
mbedalvaro 31:5f039cbddee8 66 int offsetRef; //offset between the laser signal and the lockin reference signal
mbedalvaro 31:5f039cbddee8 67 int halfRefFreq;
mbedalvaro 31:5f039cbddee8 68
mbedalvaro 31:5f039cbddee8 69 private:
mbedalvaro 31:5f039cbddee8 70 // PWM match register value are saved as private
mbedalvaro 31:5f039cbddee8 71 // to avoid computation when turn on/off for exemple
mbedalvaro 31:5f039cbddee8 72 int _currentMR[6];
mbedalvaro 31:5f039cbddee8 73
mbedalvaro 31:5f039cbddee8 74
mbedalvaro 31:5f039cbddee8 75 };
mbedalvaro 31:5f039cbddee8 76
mbedalvaro 31:5f039cbddee8 77 extern Lockin lockin;
mbedalvaro 31:5f039cbddee8 78
mbedalvaro 31:5f039cbddee8 79 #endif