File content as of revision 1:3be7b7d050f4:

#include "hardwareIO.h"

HardwareIO IO; // preintantiation of cross-file global object IO

// --------------------------------------  (0) SETUP ALL IO (call this in the setup() function in main program)

Serial pc(USBTX, USBRX); // tx, rx
LocalFileSystem local("local");               // Create the local filesystem under the name "local"

 SPI spiDAC(MOSI_PIN, MISO_PIN, SCK_PIN); // mosi, miso, sclk
 DigitalOut csDAC(CS_DAC_MIRRORS);
 
 DigitalOut Laser_Red(LASER_RED_PIN); // NOTE: this is NOT the lock in sensing laser (actually, not used yet)
 DigitalOut Laser_Green(LASER_GREEN_PIN);
 DigitalOut Laser_Blue(LASER_BLUE_PIN);
 
 // Some manual controls over the hardware function:   
 InterruptIn switchOne(SWITCH_ONE);   
 InterruptIn switchTwo(SWITCH_TWO); 
 AnalogIn ainPot(POT_ANALOG_INPUT);  
 //DigitalIn RotaryEncoderPinA(ROTARY_ENCODER_PINA); // not needed: this is done in the CRotaryEncoder library (as input or interrupt)
 //DigitalIn RotaryEncoderPinB(ROTARY_ENCODER_PINB);
 
 DigitalIn twoStateSwitch(TWO_STATE_SWITCH);

void HardwareIO::init(void) {

    // Set laser powers down:
    setRedPower(0);// TTL red laser (not used - actually not present)
    setGreenPower(0);
    setBluePower(0);
    
    //Serial Communication setup:
    pc.baud(115200);//
    //pc.printf("Serial Connection established \r\n");
   //  pc.baud(921600);//115200);//
    
    // Setup for lock-in amplifier and pwm references:
    setLaserLockinPower(1);// actually this is the Red laser in the hardware
    lockin.init();
    
    // Setup for DAC control to move the mirrors:
    // Set spi for 8 bit data, high steady state clock,
    // second edge capture, with a 10MHz clock rate:
     csDAC = 1; 
    spiDAC.format(16,0);
    spiDAC.frequency(16000000);
   
   // default initial mirror position: 
    writeOutX(CENTER_AD_MIRROR_X);
    writeOutY(CENTER_AD_MIRROR_Y);
    
    // Rotary encoder 1 (to set the FIXED THRESHOLD VALUE): 
    rotaryEncoder1.SetMinMax(0,255);
    rotaryEncoder1.Set(0); // initial value
    
     // Rotary encoder 2 (to set the additional correction angle):   
    rotaryEncoder2.SetMinMax(-10,10);
    rotaryEncoder2.Set(0); // initial value
    
    // Load LUT table:
    setLUT();
    
    // Set interrupts on RAISING edge for button-switch functions:
    // Note: The pin input will be logic '0' for any voltage on the pin below 0.8v, and '1' for any voltage above 2.0v. 
    // By default, the InterruptIn is setup with an internal pull-down resistor, but for security and clarity I will do it explicitly here:
    switchOne.mode(PullUp); // pull down seems not very good
    switchTwo.mode(PullUp);
    switchOne.fall(this, &HardwareIO::switchOneInterrupt);  // attach the address of the flip function to the falling edge
    switchTwo.fall(this, &HardwareIO::switchTwoInterrupt);  // attach the address of the flip function to the falling edge
    switchOneState=true; 
    switchTwoState=false;
    switchOneChange=false;
    switchTwoChange=false;
  
  // ATTENTION: initial state of the switch should correspond to the inital state of the threshold mode in the constructor of the laser trajectory objects (not nice):
    setSwitchOneState(true); //equal to switchOneState=true, plus set led value. False means fixed threshold, true AUTO THRESHOLD (will be the default mode)
    // NOTE: actually this interrupt switches are not used anymore to change threhold... 
     
    // Initial state of the two state switch (and don't forget to set the internal pullup resistors!):
    twoStateSwitch.mode(PullUp);// Use internal pullup for pushbutton
    twoStateSwitchState=twoStateSwitch.read(); // attention: twoStateSwitch is actually a method (this is equal to twoStateSwitch.read());
    twoStateSwitchChange=true; // this will force reading the initial threshold mode the first time the program runs
    
    // Read and update pot value:
   // updatePotValue(); // the value will be ajusted in the range 0-255
}

void HardwareIO::setSwitchOneState(bool newstate) {
    switchOneState=newstate; 
    //ledSwitchOne=(switchOneState? 1 :0); 
}

// these ISR could do more (like debouncing). 
// For the time being, I will debounce electrically with a small capacitor. 
void HardwareIO::switchOneInterrupt() {
    switchOneState=!switchOneState;
    switchOneChange=true;
}

void HardwareIO::switchTwoInterrupt() {
    switchTwoState=!switchTwoState;
    switchTwoChange=true;
}

bool HardwareIO::switchOneCheck(bool& new_state) {
    new_state=switchOneState;
    if (switchOneChange) {
        switchOneChange=false;
        return(true);
    } else     
    return(false);
}

bool HardwareIO::switchTwoCheck(bool& new_state) {
    new_state=switchTwoState;
    if (switchTwoChange) {
        switchTwoChange=false;
        return(true);
    } else return(false);
}

// NOT interrupt-based switch:
bool HardwareIO::twoStateSwitchCheck(bool& new_state) {
    new_state=twoStateSwitch; // note: twoStateSwitch is a method!
    if (twoStateSwitchState==new_state) {
        // this means that the switch did not change state:
        return(false);
    } else {
        twoStateSwitchState=new_state;
        return(true);
    }
}
    

// THIS IS NOT WORKING!!!!!!
unsigned char HardwareIO::updatePotValue() { // this will update the pot value, and return it too.
   //The value will be ajusted in the range 0-255
    //The 0.0v to 3.3v range of the AnalogIn is represented in software as a normalised floating point number from 0.0 to 1.0.

 //   potValue=(unsigned char )(ainPot*255);
   // Attention: go back to burst mode:
 //   lockin.setADC_forLockin(1);
 //   wait(1);

 //USING the adc library: 
    // unset fast adc for lockin, and set normal adc for conversion from analog input pin:
    lockin.setADC_forLockin(0);
   // wait(1);

    //Measure pin POT_ANALOG_INPUT
    adc.select(POT_ANALOG_INPUT);
    //Start ADC conversion
    adc.start();
    //Wait for it to complete
    while(!adc.done(POT_ANALOG_INPUT));
    potValue=adc.read(POT_ANALOG_INPUT);

    //Unset pin POT_ANALOG_INPUT
    adc.setup(POT_ANALOG_INPUT,0);

    lockin.setADC_forLockin(1);
    wait(0.5);
    
    return(potValue);
}

//write on the first DAC, output A (mirror X)
void HardwareIO::writeOutX(unsigned short value){
 if(value > MAX_AD_MIRRORS) value = MAX_AD_MIRRORS;
 if(value < MIN_AD_MIRRORS) value = MIN_AD_MIRRORS;
 
 value |= 0x7000;
 value &= 0x7FFF;
 
 csDAC = 0; // this means the chip is enabled (negated logic), so CLK and SDI (data) can be transfered
 spiDAC.write(value);
 csDAC = 1; // rising the pin actually writes the data in the corresponding DAC register...
}

//write on the first DAC, output B (mirror Y)
void HardwareIO::writeOutY(unsigned short value){
 if(value > MAX_AD_MIRRORS) value = MAX_AD_MIRRORS;
 if(value < MIN_AD_MIRRORS) value = MIN_AD_MIRRORS;
 
 value |= 0xF000;
 value &= 0xFFFF;
 
 csDAC = 0;
 spiDAC.write(value);
 csDAC = 1;
}

void HardwareIO::setLaserLockinPower(int powerValue){
    if(powerValue > 0){
       lockin.setLaserPower(true);
    }
    else{
       lockin.setLaserPower(false);
    }
}
// THE TTL controlled lasers:
// Note: the red one is not used here
void HardwareIO::setRedPower(int powerValue){
    if(powerValue > 0){
        Laser_Red = 1;
    }
    else{
        Laser_Red = 0;
    }
}
void HardwareIO::setGreenPower(int powerValue){
    if(powerValue > 0){
        Laser_Green = 1;
    }
    else{
        Laser_Green = 0;
    }
}
void HardwareIO::setBluePower(int powerValue){
    if(powerValue > 0){
        Laser_Blue = 1;
    }
    else{
        Laser_Blue = 0;
    }
}

void HardwareIO::setRGBPower(unsigned char color) {
    lockin.setLaserPower((color&0x04)>0? true : false); // NOTE: here the "red" is the lockin laser, not the TTL one (not used yet)
    Laser_Green=(color&0x02)>>1;
    Laser_Blue =color&0x01;
}

void HardwareIO::showLimitsMirrors(int seconds) {
      unsigned short pointsPerLine=150;
      int shiftX = (MAX_AD_MIRRORS - MIN_AD_MIRRORS) / pointsPerLine;
      int shiftY = (MAX_AD_MIRRORS - MIN_AD_MIRRORS) / pointsPerLine;
   
      Laser_Green=1;
   
     //for (int repeat=0; repeat<times; repeat++) {
     
     Timer t;
     t.start();
     while(t.read_ms()<seconds*1000) {
       
      writeOutX(MIN_AD_MIRRORS);writeOutY(MIN_AD_MIRRORS);
   
      for(int j=0; j<pointsPerLine; j++){   
       wait_us(200);//delay between each points
       writeOutY(j*shiftY + MIN_AD_MIRRORS);
       }
      
      writeOutX(MIN_AD_MIRRORS);writeOutY(MAX_AD_MIRRORS);
      for(int j=0; j<pointsPerLine; j++) {
         wait_us(200);//delay between each points
         writeOutX(j*shiftX + MIN_AD_MIRRORS);
         }
      
      writeOutX(MAX_AD_MIRRORS);writeOutY(MAX_AD_MIRRORS);
      for(int j=0; j<pointsPerLine; j++) {
         wait_us(200);//delay between each points
         writeOutY(-j*shiftX + MAX_AD_MIRRORS);
         }
      
       writeOutX(MAX_AD_MIRRORS);writeOutY(MIN_AD_MIRRORS);
      for(int j=0; j<pointsPerLine; j++) {
         wait_us(200);//delay between each points
         writeOutX(-j*shiftX + MAX_AD_MIRRORS);
         }
      
      }
      t.stop();
      Laser_Green=0;
}

void HardwareIO::scan_serial(unsigned short pointsPerLine){
      //scan the total surface with a custom resolution
      //send the lockin value for each point as a byte on the serial port to the PC
      //use "scanSLP_save" to see the data on processing
      // First, set the red laser on, and other off:
      setRGBPower(0x4);
      wait_us(1000); // just to give time to the lockin to set
       
      int shiftX = (MAX_AD_MIRRORS - MIN_AD_MIRRORS) / pointsPerLine;
      int shiftY = (MAX_AD_MIRRORS - MIN_AD_MIRRORS) / pointsPerLine;
      
      for(int j=0; j<pointsPerLine; j++){
        writeOutX(MIN_AD_MIRRORS);
        writeOutY(j*shiftY + MIN_AD_MIRRORS);
        
        wait_us(300);//begining of line delay
        for(int i=0; i<pointsPerLine; i++){
          writeOutX(i*shiftX + MIN_AD_MIRRORS);

          wait_us(200);//delay between each points
          
          // SEND A VALUE BETWEEN 0 and 255:
          pc.putc(int(255.0*lockin.getMedianValue()/4095));//printf("%dL",int(valueLockin*255));//pc.putc(int(lockin*255));//
        }
      }
}

//load Look-up Table from LUT.TXT file
//or create the file with scanLUT() if not existing.
void HardwareIO::setLUT(){

    FILE *fp = fopen(LUT_FILENAME, "r");  // Open file on the local file system for writing
    if(fp){
        //load the file into the lut table; keep the SAME resolution!
        fread(lut,sizeof(uint16),LUT_RESOLUTION*LUT_RESOLUTION,fp);
        fclose(fp);
    }
    else{
        //fclose(fp);
        //if the file "LUT.TXT" doesn't exist, create one with scanLUT()
        lockin.setLaserPower(true);
        scanLUT();
    }
    
}

//scan the total surface with a fixed 2^x resolution
//create the Look-Up Table used to "flatten" the scan according to the position
//
//To Do: maybe detect high frequency to be sure the area is clean and empty?
void HardwareIO::scanLUT(){

    //reset lut table
    for(int j=0; j<LUT_RESOLUTION; j++){
      for(int i=0; i<LUT_RESOLUTION; i++){
        lut[i][j] =0;
      }
    }
    
    int delayScanning = 300; //in us
    
    //define the distance between each points (from 0 to 4096) and the offset (here 0)
    float shiftX = 1.0*(MAX_AD_MIRRORS - MIN_AD_MIRRORS) / (LUT_RESOLUTION-1);
    float shiftY = 1.0*(MAX_AD_MIRRORS - MIN_AD_MIRRORS) / (LUT_RESOLUTION-1);
    float offsetX = MIN_AD_MIRRORS;
    float offsetY = MIN_AD_MIRRORS;
    
    //move the mirrors to the first position
    writeOutX(MAX_AD_MIRRORS);writeOutY(MIN_AD_MIRRORS);
    wait_us(500);
      
    float x, y;
    
    //scan the surface NB_SCANS times 
    //the total value in lut[i][j] shouldn't exceed uint16 !!! 
    for(int loop=0; loop<NB_SCANS; loop++){
      for(int j=0; j<LUT_RESOLUTION; j++){
        y = shiftY*j + offsetY ;
        writeOutY(int(y));
        //scan from right to left
        for(int i=LUT_RESOLUTION-1; i>=0; i--){
          x = shiftX*i + offsetX;
          writeOutX(int(x));
          wait_us(delayScanning);
          lut[i][j] += lockin_read();
        }
        //re-scan from left to right
        for(int i=0; i<LUT_RESOLUTION; i++){
          x = shiftX*i + offsetX;
          writeOutX(int(x));
          wait_us(delayScanning);
          lut[i][j] += lockin_read();
        }
      }
    }
    
    
    //save tab in file
    FILE *fp;
#ifdef LUT_FILENAME
    fp = fopen(LUT_FILENAME, "w");  // Open file on the local file system for writing
    fwrite(lut,sizeof(uint16),LUT_RESOLUTION*LUT_RESOLUTION,fp);
    fclose(fp); //close the file (the mBed will appear connected again)
#endif
    
#ifdef LUT_H_FILENAME    
    //save tab in Human readable file (not used by the program, this is just for checking)
    // NOTE: we divide the content of the lut table by NB_SCANS, for easy reading (values should be between 0-4095)
    fp = fopen(LUT_H_FILENAME, "w");  // Open file on the local file system for writing
    fprintf(fp, "scan resolution: %d x %d\r\n",LUT_RESOLUTION, LUT_RESOLUTION);
    for(int j=0; j<LUT_RESOLUTION; j++){
      for(int i=0; i<LUT_RESOLUTION; i++){
            fprintf(fp, "X=%d,\tY=%d,\tI=%d\t \r\n", int(shiftX*i + offsetX), int(shiftY*j + offsetY), int(1.0*lut[i][j]/NB_SCANS) );
      }
    }
    fclose(fp); //close the file (the mBed will appear connected again)
#endif
    
}


//Return the lockin value "corrected with the Look-UpTable" - this means a RATIO between two reflectivities (and normally, this is <1). 
float HardwareIO::lockInCorrectedValue(unsigned short x, unsigned short y){
//*******Correction using DIRECT approximation
#ifdef LUT_DIRECT
    return 2.0* NB_SCANS * lockin_read() / (lut[x >> LUT_BITS_SHIFT][y >> LUT_BITS_SHIFT]); // 2 * NB_SCANS is the number of recorded sample added to one position of the LUT (scan is performed twice: left-right and right-left)
#endif 

//*******Correction using BILINEAR approximation
#ifdef LUT_BILINEAR
    unsigned short X = x >> LUT_BITS_SHIFT; //mirror "x" is 12bits, LUT "X" needs 4bits when lut is 17x17
    unsigned short Y = y >> LUT_BITS_SHIFT; //mirror "y" is 12bits, LUT "Y" needs 4bits when lut is 17x17
    float dx = 1.0*(x & LUT_BITS_MASK)/(LUT_BITS_MASK+1); //weight to apply on X (mask with 255 and norm) 
    float dy = 1.0*(y & LUT_BITS_MASK)/(LUT_BITS_MASK+1); //weight to apply on Y (mask with 255 and norm)
    
    //Wheighted mean approximation of the Look-Up Table at the position (x,y):
    float wmLUT = (1-dy)*( (1-dx)*lut[X][Y] + dx*lut[X+1][Y] ) + dy*( (1-dx)*lut[X][Y+1] + dx*lut[X+1][Y+1] );
    
    return 2.0* NB_SCANS * lockin_read() / wmLUT;// 2 * NB_SCANS is the number of recorded sample added to one position of the LUT (scan is performed twice: left-right and right-left)   
#endif

//*******Correction using LINEAR approximation
#ifdef LUT_LINEAR
    unsigned short X = x >> LUT_BITS_SHIFT; //mirror "x" is 12bits, LUT "X" needs 4bits when lut is 17x17
    unsigned short Y = y >> LUT_BITS_SHIFT; //mirror "y" is 12bits, LUT "Y" needs 4bits when lut is 17x17
    float dx = 1.0*(x & LUT_BITS_MASK)/(LUT_BITS_MASK+1); //weight to apply on X (mask with 255 and norm) 
    float dy = 1.0*(y & LUT_BITS_MASK)/(LUT_BITS_MASK+1); //weight to apply on Y (mask with 255 and norm)
    float linearLUT, dzx, dzy;
    
    if(dx>dy){ //if the position is on the "top-right" triangle
        dzx = (lut[X+1][Y] - lut[X][Y]) * dx;
        dzy = (lut[X+1][Y+1] - lut[X+1][Y]) * dy;
    }
    else{ //if the position is on the "bottom-left" triangle
        dzy = (lut[X][Y+1] - lut[X][Y]) * dy;
        dzx = (lut[X+1][Y+1] - lut[X][Y+1]) * dx;
    }
    
    //linear approximation of the Look-Up Table at the position (x,y):
    linearLUT = lut[X][Y] + dzx + dzy;
    return 2.0* NB_SCANS * lockin_read() / linearLUT; // 2 * NB_SCANS is the number of recorded sample added to one position of the LUT (scan is performed twice: left-right and right-left)
    
#endif

//*******No corrections, just return the value divided by 4096 (this means we are assuming that the surface is everywhere perfectly reflective - we supposedly get the max value always)
#ifdef NO_LUT
    return 1.0* lockin_read()/4096;
#endif 

}