void buzz(int bType) {
  buzzFlag = true; // to intercept interrupts triggered by ledcWriteTone
  switch (bType) {
    case 10: ledcWriteTone(buzzChan,1000); delay(40); ledcWrite(buzzChan,0); break;
             //--TS1 is up
    case 11: ledcWriteTone(buzzChan,1500); delay(40); ledcWrite(buzzChan,0); break;
             //--TS2 is up
    case 12: ledcWriteTone(buzzChan,2000); delay(40); ledcWrite(buzzChan,0); break; 
             //--TS3 is up 
    case 20: ledcWriteTone(buzzChan,1100); delay(10); ledcWrite(buzzChan,0); pix.setPixelColor(0,blue); pix.show(); delay(1000-10-20); 
             ledcWriteTone(buzzChan,400); delay(20); ledcWrite(buzzChan,0); pix.clear(); pix.show(); delay(1000-20-20); break; 
             //--waiting on BLE pair
    case 21: ledcWriteTone(buzzChan,900); delay(200); ledcWriteTone(buzzChan,400);
             delay(600); ledcWrite(buzzChan,0); break; 
             //--BLE pairing achieved
    case 30: ledcWriteTone(buzzChan,100); pix.setPixelColor(0,red); pix.show(); delay(2000); ledcWrite(buzzChan,0); break;
             //--fatal error, must reboot manually
    case 40: pix.setPixelColor(0,red); pix.show(); ledcWriteTone(buzzChan,1500); delay(40); 
             ledcWrite(buzzChan,0); pix.clear(); pix.show(); break;
             //--low battery   
    case 50: if (buzzKeyb) {ledcWriteTone(buzzChan,200); delay(10); ledcWriteTone(buzzChan,0);} break;
             //--valid keyb click
    case 51: if (buzzKeyb) {ledcWriteTone(buzzChan,60); delay(80); ledcWriteTone(buzzChan,0);} break;
             //--invalid keyb click
    case 60: ledcWriteTone(buzzChan,300); delay(60); ledcWriteTone(buzzChan,0); break;
             //--function switch change
    case 70: ledcWriteTone(buzzChan,500); delay(50); ledcWriteTone(buzzChan,1500); delay(50);
             ledcWriteTone(buzzChan,2500); delay(80); ledcWrite(buzzChan,0); break;
             //--progMode ON
    case 71: ledcWriteTone(buzzChan,2500); delay(50); ledcWriteTone(buzzChan,1500); delay(50); 
             ledcWriteTone(buzzChan,500); delay(80); ledcWrite(buzzChan,0); break; 
             //--progMode OFF
  }  
  buzzFlag = false;
}

void send2Shift(byte shiftOne, byte shiftTwo) {
  digitalWrite(latchPin, 0);
  shiftOut(dataPin, clockPin, LSBFIRST, shiftTwo);
  shiftOut(dataPin, clockPin, LSBFIRST, shiftOne);
  digitalWrite(latchPin, 1);
}

void turnOnLED(byte type, int rowLED, int colLED) {
  elapsedLED = millis();
  LEDisON = true;
  switch (type) {
    case 10: pix.setPixelColor(0,orange); break; // invalid touch
    case 11: pix.setPixelColor(0,yellow); // valid touch = letter or number
             if (ledKeyb){
               if (cSym == 4) send2Shift(rowShiftOne[rowLED] + (colShiftOneFat[colLED] << 6),colShiftTwoFat[colLED]);
               else send2Shift(rowShiftOne[rowLED] + (colShiftOne[colLED] << 6),colShiftTwo[colLED]);
             }
             break;
    case 12: pix.setPixelColor(0,yellow); // valid touch = spacebar
             if (ledKeyb) send2Shift(spaceShiftOne,spaceShiftTwo);  //all layouts have spacebar
             break;
    case 13: pix.setPixelColor(0,yellow); // valid touch = backspace
             if (ledKeyb) 
              if (cSym == 2) send2Shift(backsShiftOne,backsShiftTwo); //only layout=2 has backspace
             break;
    case 14: pix.setPixelColor(0,yellow); // valid touch = enter
             if (ledKeyb) 
              if (cSym == 3 || cSym == 2) send2Shift(enterShiftOne,enterShiftTwo); //only layouts=3,2 have enter
             break;
    case  1: pix.setPixelColor(0,violet); // layout 1 selected in progMode
             send2Shift(B11111111,B11111000); break; //cols 1,2,3
    case  2: pix.setPixelColor(0,violet); // layout 2 selected in progMode
             send2Shift(B11111111,B00101111); break; //cols 5,6,7
    case  3: pix.setPixelColor(0,violet); // layout 3 selected in progMode
             send2Shift(B00111111,B11011111); break; //cols 8,9,A 
  }
  pix.show();
}

void chkOnLED() {
  if (millis() - elapsedLED > onTimer) {
    LEDisON = false;
    send2Shift(B11000000,B11111111);  //all LEDs off
    pix.clear();
    pix.show(); 
  }
}

void loadSymbols(byte boardMode) {  
  symbolTable = boardMode;
  // '&' will be filtered out in printTouchData
  switch (boardMode) {
    case 1: cSym = 4; vSym = 5; 
            symbol[0]='a'; symbol[1]='b'; symbol[2]='c'; symbol[3]='d'; symbol[4]='e';
            symbol[5]='f'; symbol[6]='g'; symbol[7]='h'; symbol[8]='i'; symbol[9]='j';
            symbol[10]='k';symbol[11]='l';symbol[12]='m';symbol[13]='n';symbol[14]=';';
            symbol[15]='o';symbol[16]='p';symbol[17]='q';symbol[18]='r';symbol[19]='s';
            symbol[20]='t';symbol[21]='u';symbol[22]='v';symbol[23]='w';symbol[24]='x';
            symbol[25]='y';symbol[26]='z';symbol[27]= 32;symbol[28]= 32;symbol[29]= 32;
            spaceShiftOne = B00000001;
            spaceShiftTwo = B00001111;
            break;
    case 2: cSym = 3; vSym = 7;
            symbol[0]='a'; symbol[1]='b'; symbol[2]='c'; symbol[3]='d'; symbol[4]='e'; symbol[5]='f'; symbol[6]='g';
            symbol[7]='h'; symbol[8]='i'; symbol[9]='j';symbol[10]='k';symbol[11]='l';symbol[12]='m';symbol[13]='n';
            symbol[14]=';';symbol[15]='o';symbol[16]='p';symbol[17]='q';symbol[18]='r';symbol[19]='s';symbol[20]='t';
            symbol[21]='u';symbol[22]='v';symbol[23]='w';symbol[24]='x';symbol[25]='y';symbol[26]='z';symbol[27]='1';
            symbol[28]='2';symbol[29]='3';symbol[30]='4';symbol[31]='5';symbol[32]='6';symbol[33]='7';symbol[34]='8';
            symbol[35]='9';symbol[36]='0';symbol[37]=32; symbol[38]=32; symbol[39]=32; symbol[40]=10; symbol[41]=10;
            spaceShiftOne = B11000001;
            spaceShiftTwo = B00100111;
            enterShiftOne = B00000001;
            enterShiftTwo = B11111111;
            break;
    case 3: cSym = 2; vSym = 10;
            symbol[0]='1'; symbol[1]='2'; symbol[2]='3'; symbol[3]='4'; symbol[4]='5'; symbol[5]='6'; symbol[6]='7'; symbol[7]='8'; symbol[8]='9'; symbol[9]='0';
            symbol[10]='&';symbol[11]='&';symbol[12]='&';symbol[13]='&';symbol[14]='&';symbol[15]='&';symbol[16]='&';symbol[17]='&';symbol[18]='&';symbol[19]='&'; 
            symbol[20]='q';symbol[21]='w';symbol[22]='e';symbol[23]='r';symbol[24]='t';symbol[25]='y';symbol[26]='u';symbol[27]='i';symbol[28]='o';symbol[29]='p';
            symbol[30]='a';symbol[31]='s';symbol[32]='d';symbol[33]='f';symbol[34]='g';symbol[35]='h';symbol[36]='j';symbol[37]='k';symbol[38]='l';symbol[39]=';'; 
            symbol[40]='&';symbol[41]='z';symbol[42]='x';symbol[43]='c';symbol[44]='v';symbol[45]='b';symbol[46]='n';symbol[47]='m';symbol[48]=10; symbol[49]=10;
            symbol[50]='&';symbol[51]=8;  symbol[52]=8;  symbol[53]=8;  symbol[54]=32; symbol[55]=32; symbol[56]=32; symbol[57]=32; symbol[58]=10; symbol[59]=10;
            spaceShiftOne = B11000001;
            spaceShiftTwo = B00001111;
            enterShiftOne = B00000011;
            enterShiftTwo = B11111111;
            backsShiftOne = B11000001;
            backsShiftTwo = B11110001;
            break;            
  }
  for (i=0; i<14; i++)
    for (j=0; j<22; j++) 
      sym2Pix[i][j] = 98;
  for (h=0; h<hSym; h++) { //hSym symbols down = 6
    t = 0;
    for (i=0; i < vSym; i++) { //vSym symbols across = 10,7,5
      for (j=0; j < rSym; j++) { //rSym rows per symbol = 2
        for (k=0; k < cSym; k++) { //cSym columns per symbol = 2,3,4
          sym2Pix [j + (rSym*h) + offR] [k + (cSym*i) + offC] = vSym*h + i;    
          //dprintln("R=" + String(j+(rSym*h)+offR) + "\tC=" + String(k+(cSym*i)+offC) + "\tS=" + String(vSym*h + i) + "\tSym=" + symbol[vSym*h + i]);
        }
      }
      LEDrSym[(h*vSym)+i] = (((rSym*h) + offR) - 1) / 2;  //0 to 5
      if (cSym == 3) {
        LEDcSym[(h*vSym)+i] =  i + t;  // 0,2,3,5,6,8,9
        //dprintln(String((h*vSym)+i)+"\t"+String((((rSym*h)+offR)-1)/2)+"\t"+String(i+t));
        if ((i % 2) == 0) t++; }
      if (cSym == 4 || cSym == 2) {
        LEDcSym[(h*vSym)+i] = (((cSym*i) + offC))/2;  //0 to 9
        //dprintln(String((h*vSym)+i)+"\t"+String((((rSym*h)+offR)-1)/2)+"\t"+String((((cSym*i) + offC)    ) / 2)); 
      }
    }
  }
  playTune(symbolTable);
}

void chkBattery() {
  if (millis() - elapsedBatt > (battTimer)) {  
    elapsedBatt = millis();
    battRead = analogRead(35); 
    battRead = ((battRead*2) / 4095 * 3.3 * 1.095);
    if (battRead < 3.5) {
      buzz(40);
      battTimer = 5 * 1000;
    }else  
      battTimer = 5 * 60 * 1000; 
    //dprintln(battRead); 
    //bleKeyb.println(battRead);
  }
}