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@1:a4050fee11f7, 2012-03-31 (annotated)

Committer:
mbedalvaro
Date:
Sat Mar 31 08:19:31 2012 +0000
Revision:
1:a4050fee11f7
Parent:
0:345b3bc7a0ea
Child:
10:6f8e48dca1bd
new scorelight methods added. VERY STRANGE problem with oldPos and pos in Verlet method, that have strange behaviour depending on the value of damp factor...

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbedalvaro 0:345b3bc7a0ea 1 #ifndef MBED_LOCKIN_H
mbedalvaro 0:345b3bc7a0ea 2 #define MBED_LOCKIN_H
mbedalvaro 0:345b3bc7a0ea 3
mbedalvaro 0:345b3bc7a0ea 4 #include "mbed.h"
mbedalvaro 0:345b3bc7a0ea 5 #include "adc.h"
mbedalvaro 0:345b3bc7a0ea 6
mbedalvaro 0:345b3bc7a0ea 7 #define MBEDFREQUENCY 96000 //frequency of the mBed in KHz
mbedalvaro 0:345b3bc7a0ea 8
mbedalvaro 0:345b3bc7a0ea 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 0:345b3bc7a0ea 10
mbedalvaro 0:345b3bc7a0ea 11 #define LOCKIN_ADC_PIN p18 //ADC pin : connect to lockin output
mbedalvaro 0:345b3bc7a0ea 12 #define LOCKIN_LASER_PIN p22 //PWM pin : connect to laser input
mbedalvaro 0:345b3bc7a0ea 13 #define LOCKIN_REF_PIN p25 //PWM pin : connect to lockin input
mbedalvaro 0:345b3bc7a0ea 14 // p21 to p25 are used by the PWM timers even if only 2 pin are connected to the circuit
mbedalvaro 0:345b3bc7a0ea 15
mbedalvaro 0:345b3bc7a0ea 16 #define BUFFER_SIZE 15
mbedalvaro 0:345b3bc7a0ea 17 #define BUFFER_SIZE_MEDIAN 5
mbedalvaro 0:345b3bc7a0ea 18 #define DELAY_BUFFER_MEDIAN 0
mbedalvaro 0:345b3bc7a0ea 19
mbedalvaro 0:345b3bc7a0ea 20
mbedalvaro 0:345b3bc7a0ea 21 class Lockin {
mbedalvaro 0:345b3bc7a0ea 22 public:
mbedalvaro 0:345b3bc7a0ea 23 // default constructor (untouched!)
mbedalvaro 0:345b3bc7a0ea 24 // Lockin();
mbedalvaro 0:345b3bc7a0ea 25
mbedalvaro 0:345b3bc7a0ea 26 // initialization of object modes (could have parameters):
mbedalvaro 0:345b3bc7a0ea 27 void init();
mbedalvaro 0:345b3bc7a0ea 28
mbedalvaro 0:345b3bc7a0ea 29 void initPWM(); //setup the laser and reference signal used by the lockin
mbedalvaro 0:345b3bc7a0ea 30 void setPWMFrequency(float freq); //change the shared period of the pwm signals
mbedalvaro 0:345b3bc7a0ea 31 void setLaserPhaseShift(float phaseShift); //change the phase shift of the laser (from 0 to 1)
mbedalvaro 0:345b3bc7a0ea 32 void setLockinPhaseShift(float phaseShift); //change the phase shift of the lock-in (from 0 to 1)
mbedalvaro 0:345b3bc7a0ea 33 //future works:
mbedalvaro 0:345b3bc7a0ea 34 //add function to change frequency or offset with a potentiometer for exemple
mbedalvaro 0:345b3bc7a0ea 35 //or scan the best frequency...
mbedalvaro 0:345b3bc7a0ea 36
mbedalvaro 0:345b3bc7a0ea 37 void setLaserPower(bool power); //change PWM settings to turn on/off the laser
mbedalvaro 0:345b3bc7a0ea 38
mbedalvaro 0:345b3bc7a0ea 39
mbedalvaro 0:345b3bc7a0ea 40 float getSmoothValue(); //return the average of the value stored on the buffer
mbedalvaro 0:345b3bc7a0ea 41 float getLastValue(); //return the last conversion of the ADC
mbedalvaro 0:345b3bc7a0ea 42 float getMedianValue(); //return the median value of the buffer
mbedalvaro 0:345b3bc7a0ea 43 //it is just a begining; we can add more complex method for denoising for exemple
mbedalvaro 0:345b3bc7a0ea 44 //maybe, needs function to start and stop the lockin
mbedalvaro 0:345b3bc7a0ea 45
mbedalvaro 0:345b3bc7a0ea 46 void clearBuffer();
mbedalvaro 0:345b3bc7a0ea 47
mbedalvaro 0:345b3bc7a0ea 48 //can be private
mbedalvaro 0:345b3bc7a0ea 49 //void catchInterupt(uint32_t value);
mbedalvaro 0:345b3bc7a0ea 50
mbedalvaro 0:345b3bc7a0ea 51 //variables
mbedalvaro 1:a4050fee11f7 52 float buffer[BUFFER_SIZE]; // does not need to be a float - in fact values are from 0 to 4096 (i.e.,
mbedalvaro 1:a4050fee11f7 53 //unsigned short int buffer[BUFFER_SIZE]; // this is two bytes (0 to 65535)
mbedalvaro 0:345b3bc7a0ea 54 int buffer_pos;
mbedalvaro 0:345b3bc7a0ea 55
mbedalvaro 0:345b3bc7a0ea 56 float refFrequency; // frequency of sensing laser and lock-in (in KHz)
mbedalvaro 0:345b3bc7a0ea 57 //Phase shift of the pwm signals (from 0 to 1):
mbedalvaro 0:345b3bc7a0ea 58 //it corresponds to a percentage of the half of a period
mbedalvaro 0:345b3bc7a0ea 59 //(no phase shift ==> 0% / 90deg phase shift ==> 100%)
mbedalvaro 0:345b3bc7a0ea 60 float phaseShiftLaser; // phase shift of the sensing laser
mbedalvaro 0:345b3bc7a0ea 61 float phaseShiftLockin; // phase shift of the lock-in reference
mbedalvaro 0:345b3bc7a0ea 62
mbedalvaro 0:345b3bc7a0ea 63 int refFreq; //frequency of the lockin
mbedalvaro 0:345b3bc7a0ea 64 int offsetRef; //offset between the laser signal and the lockin reference signal
mbedalvaro 0:345b3bc7a0ea 65 int halfRefFreq;
mbedalvaro 0:345b3bc7a0ea 66
mbedalvaro 0:345b3bc7a0ea 67 private:
mbedalvaro 0:345b3bc7a0ea 68 // PWM match register value are saved as private
mbedalvaro 0:345b3bc7a0ea 69 // to avoid computation when turn on/off for exemple
mbedalvaro 0:345b3bc7a0ea 70 int _currentMR[6];
mbedalvaro 0:345b3bc7a0ea 71
mbedalvaro 0:345b3bc7a0ea 72
mbedalvaro 0:345b3bc7a0ea 73 };
mbedalvaro 0:345b3bc7a0ea 74
mbedalvaro 0:345b3bc7a0ea 75 extern Lockin lockin;
mbedalvaro 0:345b3bc7a0ea 76
mbedalvaro 0:345b3bc7a0ea 77 #endif