Alvaro Cassinelli / Mbed 2 deprecated skinGames_II

save loops

Dependencies:   mbed

hardwareIO/lockin.h@0:df6fdd9b99f0, 2014-12-02 (annotated)

Committer:
mbedalvaro
Date:
Tue Dec 02 04:39:15 2014 +0000
Revision:
0:df6fdd9b99f0
this new version of skinGames will have a function that stops scanning as the laser reaches the same position (i.e., loops) with a certain precision. It is for extracting contours for Takashita project. It can then save on a file or send on osc

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbedalvaro 0:df6fdd9b99f0 1 #ifndef MBED_LOCKIN_H
mbedalvaro 0:df6fdd9b99f0 2 #define MBED_LOCKIN_H
mbedalvaro 0:df6fdd9b99f0 3
mbedalvaro 0:df6fdd9b99f0 4 #include "mbed.h"
mbedalvaro 0:df6fdd9b99f0 5 #include "adc.h"
mbedalvaro 0:df6fdd9b99f0 6
mbedalvaro 0:df6fdd9b99f0 7 #define MBEDFREQUENCY 96000 //frequency of the mBed in KHz
mbedalvaro 0:df6fdd9b99f0 8
mbedalvaro 0:df6fdd9b99f0 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:df6fdd9b99f0 10
mbedalvaro 0:df6fdd9b99f0 11 #define LOCKIN_ADC_PIN p18 //ADC pin : connect to lockin "output"
mbedalvaro 0:df6fdd9b99f0 12
mbedalvaro 0:df6fdd9b99f0 13 #define LOCKIN_REF_PIN p23 //PWM pin : connect to lockin reference signal.
mbedalvaro 0:df6fdd9b99f0 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 0:df6fdd9b99f0 15 // p21 to p26 are used by the PWM timers even if only 2 pin are connected to the circuit
mbedalvaro 0:df6fdd9b99f0 16
mbedalvaro 0:df6fdd9b99f0 17 #define BUFFER_SIZE 15
mbedalvaro 0:df6fdd9b99f0 18 #define BUFFER_SIZE_MEDIAN 5
mbedalvaro 0:df6fdd9b99f0 19 #define DELAY_BUFFER_MEDIAN 0
mbedalvaro 0:df6fdd9b99f0 20
mbedalvaro 0:df6fdd9b99f0 21
mbedalvaro 0:df6fdd9b99f0 22 class Lockin {
mbedalvaro 0:df6fdd9b99f0 23 public:
mbedalvaro 0:df6fdd9b99f0 24 // default constructor (untouched!)
mbedalvaro 0:df6fdd9b99f0 25 // Lockin();
mbedalvaro 0:df6fdd9b99f0 26
mbedalvaro 0:df6fdd9b99f0 27 // initialization of object modes (could have parameters):
mbedalvaro 0:df6fdd9b99f0 28 void init();
mbedalvaro 0:df6fdd9b99f0 29
mbedalvaro 0:df6fdd9b99f0 30 void initPWM(); //setup the laser and reference signal used by the lockin
mbedalvaro 0:df6fdd9b99f0 31 void setPWMFrequency(float freq); //change the shared period of the pwm signals
mbedalvaro 0:df6fdd9b99f0 32 void setLaserPhaseShift(float phaseShift); //change the phase shift of the laser (from 0 to 1)
mbedalvaro 0:df6fdd9b99f0 33 void setLockinPhaseShift(float phaseShift); //change the phase shift of the lock-in (from 0 to 1)
mbedalvaro 0:df6fdd9b99f0 34 //future works:
mbedalvaro 0:df6fdd9b99f0 35 //add function to change frequency or offset with a potentiometer for exemple
mbedalvaro 0:df6fdd9b99f0 36 //or scan the best frequency...
mbedalvaro 0:df6fdd9b99f0 37
mbedalvaro 0:df6fdd9b99f0 38 void setLaserPower(bool power); //change PWM settings to turn on/off the laser
mbedalvaro 0:df6fdd9b99f0 39
mbedalvaro 0:df6fdd9b99f0 40 void setADC_forLockin(int mode); //1 set, 0 reset
mbedalvaro 0:df6fdd9b99f0 41
mbedalvaro 0:df6fdd9b99f0 42 unsigned short getSmoothValue(); //return the average of the value stored on the buffer
mbedalvaro 0:df6fdd9b99f0 43 unsigned short getLastValue(); //return the last conversion of the ADC
mbedalvaro 0:df6fdd9b99f0 44 unsigned short getMedianValue(); //return the median value of the buffer
mbedalvaro 0:df6fdd9b99f0 45 //it is just a begining; we can add more complex method for denoising for exemple
mbedalvaro 0:df6fdd9b99f0 46 //maybe, needs function to start and stop the lockin
mbedalvaro 0:df6fdd9b99f0 47
mbedalvaro 0:df6fdd9b99f0 48 void clearBuffer();
mbedalvaro 0:df6fdd9b99f0 49
mbedalvaro 0:df6fdd9b99f0 50 //can be private
mbedalvaro 0:df6fdd9b99f0 51 //void catchInterupt(uint32_t value);
mbedalvaro 0:df6fdd9b99f0 52
mbedalvaro 0:df6fdd9b99f0 53 //variables
mbedalvaro 0:df6fdd9b99f0 54 unsigned short buffer[BUFFER_SIZE]; // does not need to be a float - in fact values are from 0 to 4096 (i.e.,
mbedalvaro 0:df6fdd9b99f0 55 //unsigned short int buffer[BUFFER_SIZE]; // this is two bytes (0 to 65535)
mbedalvaro 0:df6fdd9b99f0 56 unsigned short orderedBuffer[BUFFER_SIZE_MEDIAN]; // for computation of the MEDIAN value
mbedalvaro 0:df6fdd9b99f0 57 int buffer_pos;
mbedalvaro 0:df6fdd9b99f0 58
mbedalvaro 0:df6fdd9b99f0 59 float refFrequency; // frequency of sensing laser and lock-in (in KHz)
mbedalvaro 0:df6fdd9b99f0 60 //Phase shift of the pwm signals (from 0 to 1):
mbedalvaro 0:df6fdd9b99f0 61 //it corresponds to a percentage of the half of a period
mbedalvaro 0:df6fdd9b99f0 62 //(no phase shift ==> 0% / 90deg phase shift ==> 100%)
mbedalvaro 0:df6fdd9b99f0 63 float phaseShiftLaser; // phase shift of the sensing laser
mbedalvaro 0:df6fdd9b99f0 64 float phaseShiftLockin; // phase shift of the lock-in reference
mbedalvaro 0:df6fdd9b99f0 65
mbedalvaro 0:df6fdd9b99f0 66 int refFreq; //frequency of the lockin
mbedalvaro 0:df6fdd9b99f0 67 int offsetRef; //offset between the laser signal and the lockin reference signal
mbedalvaro 0:df6fdd9b99f0 68 int halfRefFreq;
mbedalvaro 0:df6fdd9b99f0 69
mbedalvaro 0:df6fdd9b99f0 70 private:
mbedalvaro 0:df6fdd9b99f0 71 // PWM match register value are saved as private
mbedalvaro 0:df6fdd9b99f0 72 // to avoid computation when turn on/off for exemple
mbedalvaro 0:df6fdd9b99f0 73 int _currentMR[6];
mbedalvaro 0:df6fdd9b99f0 74
mbedalvaro 0:df6fdd9b99f0 75
mbedalvaro 0:df6fdd9b99f0 76 };
mbedalvaro 0:df6fdd9b99f0 77
mbedalvaro 0:df6fdd9b99f0 78 extern Lockin lockin;
mbedalvaro 0:df6fdd9b99f0 79
mbedalvaro 0:df6fdd9b99f0 80 #endif