Laser Sensing Display for UI interfaces in the real world
Fork of skinGames_forktest by
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?
User | Revision | Line number | New 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 |