synch the camera trigger with the signal in phase and quadrature (every frame or every N frames). We can also simulate the product by the in-phase signal (with a small arbitrary phase difference)
main.cpp
- Committer:
- mbedalvaro
- Date:
- 2014-12-08
- Revision:
- 1:4284f27d638d
- Parent:
- 0:4b5874bff9bb
File content as of revision 1:4284f27d638d:
#include "mbed.h" #include "Flipper.h" // The following parameters can be changed by serial commands: // NOTE: program 9 on the LCC-230 gives a freq of 150Hz. If frame rate for the camera is 30fps, then the nb of cycles per frame is 150/30=5 // for 28.09, then the of cycles per frame is 150/28.09=5.339 float CAMERA_FPS=58.75;//28.0915;//28.09; unsigned long CAMERA_TRIGGER_PERIOD=1000000.0/CAMERA_FPS; // it is recommendable that this division gives an integer! float EXPOSURE_TIME_FACTOR=1.0/3; unsigned long EXPOSURE_TIME=EXPOSURE_TIME_FACTOR*CAMERA_TRIGGER_PERIOD; unsigned long WAITING_TIME=CAMERA_TRIGGER_PERIOD-EXPOSURE_TIME; // NOTE: since the delays (waiting time and exposure time) are in microseconds, we NEED to have an integer number of cycles per CAMERA frame... // (no pb if there is not an integer INSIDE the exposure time, but better to have it). Hence the "approximate" value: float approximate_NbCylclesExposureTime=6; unsigned long NB_CYCLES_PER_CAMERA_FRAME=1.0*approximate_NbCylclesExposureTime/EXPOSURE_TIME_FACTOR; unsigned long LED_PERIOD=1000000.0/(NB_CYCLES_PER_CAMERA_FRAME*CAMERA_FPS); //in us // NOTE: there is no warangy this division will be integer! PLUS it must be a multiple of 2!! mmm... unsigned int NB_FRAMES_TOGGLE_QP=1; // this is the nb of camera frames before toggling the modulation (note: there is no synchronization!) enum SignalMode {PHASE=0, QUADRATURE, TOGGLE_PHASE_QUADRATURE}; SignalMode currentSignalMode=TOGGLE_PHASE_QUADRATURE; //NOTE: all the leds mode affected by this at the same time //Trigger cameraTrigger(cameraTriggerPin,1.0*CAMERA_FPS,(unsigned int)EXPOSURE_TIME); Trigger cameraTrigger(cameraTriggerPin,(unsigned int)WAITING_TIME-27,(unsigned int)EXPOSURE_TIME); Flipper ledSource(ledPin, LED_PERIOD); Shutter lcdShutter(shutterPin, LED_PERIOD); Serial pc(USBTX, USBRX); // tx, rx void processSerial(); int main() { pc.baud(9600); cameraTrigger.setQPToggleFrames(NB_FRAMES_TOGGLE_QP); cameraTrigger.start(); ledSource.start(); // add some delay? // wait_us(100); lcdShutter.mixSignal(true); lcdShutter.start(); // spin in a main loop. flipper will interrupt it to call flip while(1) { processSerial(); } } // String to store ALPHANUMERIC DATA (i.e., integers, floating point numbers, unsigned ints, etc represented as DEC) sent wirelessly: char incomingValue[5]; char incomingByte; char indexString=0; void processSerial() { while(pc.readable()>0) { char incomingByte =pc.getc(); if (incomingByte >='0' && incomingByte <='9') { incomingValue[indexString]=incomingByte; indexString++; } else { // check for terminator (i.e. "CONTROL CODES"): if (incomingByte=='P') { currentSignalMode=PHASE; cameraTrigger.toggleQP(false); ledSource.flip(); } else if (incomingByte=='Q') { currentSignalMode=QUADRATURE; cameraTrigger.toggleQP(false); ledSource.flip(); } else if (incomingByte=='T') { currentSignalMode=TOGGLE_PHASE_QUADRATURE; // periodic toogling (every a TOGGLE_QP_PERIOD) cameraTrigger.toggleQP(true); } else if (incomingByte=='s') { // simulated shutter OFF lcdShutter.mixSignal(false); } else if (incomingByte=='S') { // simulated shutter ON lcdShutter.mixSignal(true); // CAMERA PARAMETERS: } else if (incomingByte == 'F') { // camera frame rate incomingValue[indexString]=0; // termination for the string indexString=0; cameraTrigger.setFrameRate(atoi(incomingValue)); } else if (incomingByte == 'E') { // control Exposure time: incomingValue[indexString]=0; // termination for the string indexString=0; cameraTrigger.setExposure(atoi(incomingValue)); } else if (incomingByte == 'L') { // get the LED PERIOD (to adjust the real LCD shutter) // incomingValue[indexString]=0; // termination for the string // indexString=0; pc.printf("\n\nCAMERA FPS: %f fps\n", CAMERA_FPS); pc.printf("CAMERA TRIGGER PERIOD: %i us\n", CAMERA_TRIGGER_PERIOD); pc.printf("EXPOSURE TIME: %i us\n", EXPOSURE_TIME); pc.printf("\nLED PERIOD: %i us\n", LED_PERIOD); pc.printf("LED FREQ: %f Hz\n", 1.0/LED_PERIOD*1000000); pc.printf("TOGGLE QP every: %i frames\n", NB_FRAMES_TOGGLE_QP); } } } }