#define BAUD 57600

//TLC5940NT pin definitions
#define VPRG 2
#define SIN 11
#define SCLK 13
#define XLAT 4
#define BLANK 5
#define DCPRG 6
#define GSCLK 7

#define MISO 12 //No se usan
#define SS 10 //No se usan

const byte remap[7][5] = { //Mapeo de los leds
  {6,17,24,35,42},
  {5,16,23,34,41},
  {4,11,22,33,40},
  {3,10,21,32,39},
  {2,9,20,27,38},
  {1,8,19,26,37},
  {0,7,18,25,36},
};

/*byte code[128][7] = {{ B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //0 = NULL
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //1
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //2
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //3
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //4
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //5
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //6
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //7
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //8
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //9
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //10
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //11
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //12
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //13
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //14
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //15
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //16
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //17
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //18
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //19
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //20
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //21
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //22
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //23
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //24
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //25
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //26
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //27
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //28
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //29
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //30
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //31
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //32
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //33
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //34
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //35
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //36
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //37
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //38
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //39
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //40
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //41
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //42
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //43
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //44
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //45
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //46
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //47
                         { B01110, B10001, B10011, B10101, B11001, B10001, B01110}, //48 = '0'
                         { B00100, B01100, B10100, B00100, B00100, B00100, B11111}, //49 = '1'
                         { B01110, B10001, B00001, B00110, B01000, B10000, B11111}, //50 = '2'
                         { B01110, B10001, B00001, B01110, B00001, B10001, B01110}, //51 = '3'
                         { B00010, B00110, B01010, B10010, B11111, B00010, B00010}, //52 = '4'
                         { B11111, B10000, B11110, B00001, B00001, B10001, B01110}, //53 = '5'
                         { B01110, B10001, B10000, B11110, B10001, B10001, B01110}, //54 = '6'
                         { B11111, B00001, B00010, B00100, B01000, B10000, B10000}, //55 = '7'
                         { B01110, B10001, B10001, B01110, B10001, B10001, B01110}, //56 = '8'
                         { B01110, B10001, B10001, B01111, B00001, B10001, B01110}, //57 = '9'
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //58
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //59
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //60
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //61
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //62
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //63                         
                         { B00000, B00000, B00000, B00000, B00000, B00000, B00000}, //64
                         { B01110, B10001, B11111, B10001, B10001, B10001, B10001}, //65 = 'A'
                         { B11110, B10001, B11110, B10001, B10001, B10001, B11110}, //66 = 'B'
                         { B01110, B10001, B10000, B10000, B10000, B10001, B01110}, //67 = 'C'
                         { B11110, B10001, B10001, B10001, B10001, B10001, B11110}, //68 = 'D'
                         { B01111, B10000, B11111, B10000, B10000, B10000, B01111}, //69 = 'E'
                         { B01111, B10000, B11111, B10000, B10000, B10000, B10000}, //70 = 'F'
                         { B01110, B10001, B10000, B10011, B10001, B10001, B01110}, //71 = 'G'
                         { B10001, B10001, B11111, B10001, B10001, B10001, B10001}, //72 = 'H'
                         { B11111, B00100, B00100, B00100, B00100, B00100, B11111}, //73 = 'I'
                         { B00001, B00001, B00001, B00001, B10001, B10001, B01110}, //74 = 'J'
                         { B10001, B10010, B10100, B11000, B10100, B10010, B10001}, //75 = 'K'
                         { B10000, B10000, B10000, B10000, B10000, B10000, B11111}, //76 = 'L'
                         { B10001, B11011, B10101, B10001, B10001, B10001, B10001}, //77 = 'M'
                         { B10001, B11001, B10101, B10011, B10001, B10001, B10001}, //78 = 'N'
                         { B01110, B10001, B10001, B10001, B10001, B10001, B01110}, //79 = 'O'
                         { B11110, B10001, B11110, B10000, B10000, B10000, B10000}, //80 = 'P'
                         { B01110, B10001, B10001, B10001, B10101, B10101, B01110}, //81 = 'Q'
                         { B11110, B10001, B11110, B11000, B10100, B10010, B10001}, //82 = 'R'
                         { B01110, B10001, B10000, B01110, B00001, B10001, B01110}, //83 = 'S'
                         { B11111, B00100, B00100, B00100, B00100, B00100, B00100}, //84 = 'T'
                         { B10001, B10001, B10001, B10001, B10001, B10001, B01110}, //85 = 'U'
                         { B10001, B10001, B10001, B10001, B10001, B01010, B00100}, //86 = 'V'
                         { B10001, B10001, B10001, B10001, B10101, B10101, B01010}, //87 = 'W'
                         { B10001, B10001, B01010, B00100, B01010, B10001, B10001}, //88 = 'X'
                         { B10001, B10001, B01010, B00100, B00100, B00100, B00100}, //89 = 'Y'
                         { B11111, B00001, B00010, B00100, B01000, B10000, B11111}, //90 = 'Z'
                         { B10000, B10000, B10000, B10010, B01010, B00110, B11110}, //flecha = 35
                         
                        };*/
                        
byte numero[10][7] =  { { B01110, B10001, B10011, B10101, B11001, B10001, B01110}, //48 = '0'
                        { B00100, B01100, B10100, B00100, B00100, B00100, B11111}, //49 = '1'
                        { B01110, B10001, B00001, B00110, B01000, B10000, B11111}, //50 = '2'
                        { B01110, B10001, B00001, B01110, B00001, B10001, B01110}, //51 = '3'
                        { B00010, B00110, B01010, B10010, B11111, B00010, B00010}, //52 = '4'
                        { B11111, B10000, B11110, B00001, B00001, B10001, B01110}, //53 = '5'
                        { B01110, B10001, B10000, B11110, B10001, B10001, B01110}, //54 = '6'
                        { B11111, B00001, B00010, B00100, B01000, B10000, B10000}, //55 = '7'
                        { B01110, B10001, B10001, B01110, B10001, B10001, B01110}, //56 = '8'
                        { B01110, B10001, B10001, B01111, B00001, B10001, B01110}, //57 = '9'
};

byte caracterA[13][7] =  {{ B01110, B10001, B11111, B10001, B10001, B10001, B10001}, //65 = 'A'
                         { B11110, B10001, B11110, B10001, B10001, B10001, B11110}, //66 = 'B'
                         { B01110, B10001, B10000, B10000, B10000, B10001, B01110}, //67 = 'C'
                         { B11110, B10001, B10001, B10001, B10001, B10001, B11110}, //68 = 'D'
                         { B01111, B10000, B11111, B10000, B10000, B10000, B01111}, //69 = 'E'
                         { B01111, B10000, B11111, B10000, B10000, B10000, B10000}, //70 = 'F'
                         { B01110, B10001, B10000, B10011, B10001, B10001, B01110}, //71 = 'G'
                         { B10001, B10001, B11111, B10001, B10001, B10001, B10001}, //72 = 'H'
                         { B11111, B00100, B00100, B00100, B00100, B00100, B11111}, //73 = 'I'
                         { B00001, B00001, B00001, B00001, B10001, B10001, B01110}, //74 = 'J'
                         { B10001, B10010, B10100, B11000, B10100, B10010, B10001}, //75 = 'K'
                         { B10000, B10000, B10000, B10000, B10000, B10000, B11111}, //76 = 'L'
                         { B10001, B11011, B10101, B10001, B10001, B10001, B10001}, //77 = 'M'
};
                         
byte caracterB[14][7] = {{ B10001, B11001, B10101, B10011, B10001, B10001, B10001}, //78 = 'N'
                         { B01110, B10001, B10001, B10001, B10001, B10001, B01110}, //79 = 'O'
                         { B11110, B10001, B11110, B10000, B10000, B10000, B10000}, //80 = 'P'
                         { B01110, B10001, B10001, B10001, B10101, B10101, B01110}, //81 = 'Q'
                         { B11110, B10001, B11110, B11000, B10100, B10010, B10001}, //82 = 'R'
                         { B01110, B10001, B10000, B01110, B00001, B10001, B01110}, //83 = 'S'
                         { B11111, B00100, B00100, B00100, B00100, B00100, B00100}, //84 = 'T'
                         { B10001, B10001, B10001, B10001, B10001, B10001, B01110}, //85 = 'U'
                         { B10001, B10001, B10001, B10001, B10001, B01010, B00100}, //86 = 'V'
                         { B10001, B10001, B10001, B10001, B10101, B10101, B01010}, //87 = 'W'
                         { B10001, B10001, B01010, B00100, B01010, B10001, B10001}, //88 = 'X'
                         { B10001, B10001, B01010, B00100, B00100, B00100, B00100}, //89 = 'Y'
                         { B11111, B00001, B00010, B00100, B01000, B10000, B11111}, //90 = 'Z'
                         { B10000, B10000, B10000, B10010, B01010, B00110, B11110}, //flecha = 35
};

byte espacio[7] = { B00000, B00000, B00000, B00000, B00000, B00000, B00000}; //32 = ' '

byte sonrisa[7] = { B00000, B01010, B01010, B00000, B10001, B01110, B00000}; //32 = ' '

// Holds the current colour level for each of the buttons
int levelW[64] = {
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};

// Variables for interpreting the serial commands
byte command = 0;

// For interrupt timing; needed only to do intermediate clock speeds
/* Divide interrupt frequency by a factor of FREQ. It is preferable to keep
   FREQ as small as possible, and control the frequency of the interrupts
   using the hardware clock. Setting it to 1 disables this entirely, which,
   if it works, is ideal; this should be the same as commenting out the
   "#define FREQ" statement entirely.
*/
#define FREQ 1 // How many interrupts occur before the serial commands are read
#if FREQ > 1
byte int_counter = 0;
#endif

// Transfer a character out over hardware SPI
char spi_transfer(volatile byte data)
{
  SPDR = data;                    // Start the transmission
  while (!(SPSR & (1<<SPIF)))     // Wait the end of the transmission
  {
  };
  return SPDR;                    // return the received byte
}

// Run this animation once at startup. Currently unfinished.
void startup(){
  for(byte x = 0; x < 7; ++x){
   for(byte y = 0; y <5; ++y){
   //levelR[remap[x][y]] = 4095;  
   levelW[remap[x][y]] = 500;
   for(int i = 0; i <50; ++i) makemagic();
   }
   }
}

ISR(TIMER2_OVF_vect) {
  sei(); //Reenable global interrupts, otherwise serial commands will get dropped
#if FREQ > 1
  if(++int_counter == FREQ){ // Only do this once every FREQ-th interrupt
    int_counter = 0;
#endif //FREQ
      if(Serial.available()){
          command = Serial.read();
          if (command==32) letra(espacio);
          else if (command<58) letra(numero[command-48]);
          else if (command<78) letra(caracterA[command-65]);
          else if (command<92) letra(caracterB[command-78]);
          else letra(sonrisa);
      }
    // If the serial buffer is getting too close to full, keep executing the parsing until it falls below a given level
    // This might cause flicker, or even dropped messages, but it should prevent a crash.
#if FREQ > 1
  }
#endif //FREQ
}

void setup() {
  
  //Setup data directions, and set everything to the correct initial levels,
  // For TLC5940
  pinMode(VPRG, OUTPUT);
  pinMode(SIN, OUTPUT);
  pinMode(SCLK, OUTPUT);
  pinMode(XLAT, OUTPUT);
  pinMode(BLANK, OUTPUT);
  pinMode(DCPRG, OUTPUT);
  pinMode(GSCLK, OUTPUT);
  pinMode(MISO, INPUT);
  pinMode(SS,OUTPUT);
  digitalWrite(SS,HIGH); //disable device
  digitalWrite(SIN, LOW);
  digitalWrite(SCLK, LOW);
  digitalWrite(XLAT, LOW);
  digitalWrite(VPRG, LOW);
  digitalWrite(BLANK, HIGH);
  digitalWrite(GSCLK, HIGH);
  digitalWrite(DCPRG, LOW); // USE EEPROM DC register if LOW

    //Setup the Hardware SPI registers
  // SPCR = 01010000
  //interrupt disabled,spi enabled,msb 1st,master,clk low when idle,
  //sample on leading edge of clk,system clock/4 (fastest)
  byte clr;
  SPCR = (1<<SPE)|(1<<MSTR);
  clr=SPSR;
  clr=SPDR;
  delay(10);


  // Start the serial port
  Serial.begin(BAUD);
  delay(10);
  
  TCCR2A = 0;
  TCCR2B = 0<<CS22 | 1<<CS21 | 1<<CS20;

  //Timer2 Overflow Interrupt Enable
  TIMSK2 = 1<<TOIE2;

  delay(10);
  
  // Run the startup animation
  //startup();
}

void loop () {
  
  /*for(int e = 0; e <10; ++e)
    {
      letra(numero[e]);
      for(int i = 0; i <500; ++i) makemagic();
    }
  for(int e = 0; e <13; ++e)
    {
      letra(caracterA[e]);
      for(int i = 0; i <500; ++i) makemagic();
    }
  for(int e = 0; e <14; ++e)
    {
      letra(caracterB[e]);
      for(int i = 0; i <500; ++i) makemagic();
    }*/
  
  /*letra(code[command]);
  for(int i = 0; i <500; ++i) makemagic();*/
  
  makemagic();
  
}

void makemagic(){
  setGreysR();        
  feedPorts();
}

void setGreysR() {
  digitalWrite(BLANK, HIGH);
  digitalWrite(XLAT,LOW);
  for(int i = 21; i>=0; i--){
    spi_transfer( (levelW[2*i+1] & 0x0FF0) >> 4 );
    spi_transfer( ((levelW[2*i+1] & 0xF) << 4) | ((levelW[2*i] & 0x0F00) >> 8) );
    spi_transfer( levelW[2*i] & 0xFF);
  }
  digitalWrite(XLAT,HIGH);
  digitalWrite(XLAT,LOW);
  digitalWrite(BLANK, LOW);
}

void feedPorts() {
  // Clock for TLC5940's PWM
  digitalWrite(BLANK, HIGH);
  digitalWrite(BLANK, LOW);      //=all outputs ON, start PWM cycle
  for (int i=0; i<4096; i++) {
    pulseGSCLK();
  }
}

void pulseGSCLK() {
  //ultra fast pulse trick, using digitalWrite caused flickering
  PORTD |= 0x80 ; // bring pin 7 high, but don't touch any of the other pins in PORTB
  //16 nanosecs is the min pulse width for the 5940, but no pause seems needed here
  PORTD &= 0x7F;  // bring pin 7 low without touching the other pins in PORTB
}

void letra(byte let[7] ) {
  byte letbool=0;
  for(byte x = 0; x < 7; ++x){  
   for(byte y = 0; y <5; ++y){
   //levelR[remap[x][y]] = 4095;  
   //Serial.print(0xFE&(let[letbool]>>y),BYTE);
   //Serial.print(' ');
   //if (y==4) Serial.println();
   if (0x10&(let[letbool]<<y)) levelW[remap[x][y]] = 500;
   else levelW[remap[x][y]] = 0;
   }
   ++letbool;
   }
}