#define BAUD 115200

//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 intensidad 3000 //0 - 4095

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

#include <EEPROM.h>

// start reading from the first byte (address 0) of the EEPROM
int address = 0;

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},
};
               
int modo= 0;               
                        
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, B10001, B11111, B10001, B10001, B10001}, //65 = 'A'
                         { B11110, B10001, B10001, B11110, B10001, B10001, B11110}, //66 = 'B'
                         { B01110, B10001, B10000, B10000, B10000, B10001, B01110}, //67 = 'C'
                         { B11110, B10001, B10001, B10001, B10001, B10001, B11110}, //68 = 'D'
                         { B11111, B10000, B10000, B11110, B10000, B10000, B11111}, //69 = 'E'
                         { B11111, B10000, B10000, B11110, B10000, B10000, B10000}, //70 = 'F'
                         { B01110, B10001, B10000, B10111, B10001, B10001, B01110}, //71 = 'G'
                         { B10001, B10001, B10001, B11111, 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, B10001, B11110, B10000, B10000, B10000}, //80 = 'P'
                         { B01110, B10001, B10001, B10001, B10101, B10101, B01110}, //81 = 'Q'
                         { B11110, B10001, B10001, B11110, 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, B01110, B10001, B00000, B01010, B01010, B00000}; //Sonrisa

byte test[7] = { B11111, B11111, B11111, B11111, B11111, B11111, B11111};//0x01

// 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
int command = 32;

byte command_ant = 32;
byte finish = 1;

byte count = 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 100 // 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
}

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()){
          
          int val = Serial.read();
          
          if ((val==13)||(val==10)||(val==0x01))  //INTRO
          {
            if(val==13) 
            {
              EEPROM.write(address, 32); // grabamos en eeprom el caracter
              Serial.print(val,BYTE);
              count=0;
              finish=0;
              modo=8;
            }
            else if(val==0x01) 
            {
              Serial.print(val,BYTE);
              count=0;
              finish=0;
              modo=9;
            }
          }
          else if (count==1) Serial.print(val,BYTE); //tunel
          else if ((val==32)||((val<58)&&(val>=48))||((val<78)&&(val>=65))||((val<92)&&(val>=78))||((val<110)&&(val>=97))||((val<123)&&(val>=110)))
            {
              command=val;
              EEPROM.write(address, val); // grabamos en eeprom el caracter
              if (command==32) modo=1; //Espacio
              else if ((command<58)&&(command>=48)) modo=2; //Numeros
              else if ((command<78)&&(command>=65)) modo=3; //Letras de la 'A' a la 'M'
              else if ((command<92)&&(command>=78)) modo=5; //Letras de la 'N' a la 'Z' y la flecha
              else if ((command<110)&&(command>=97)) modo=4; //Letras de la 'a' a 'm'
              else if ((command<123)&&(command>=110)) modo=6; //Letras de la 'n' a la 'z'
              count=1;
            }
      }
    // 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
  
  //////// LECTURA DE EEPROM ////////
  command = EEPROM.read(address);
  
  if (command==32) modo=1; //Espacio
  else if ((command<58)&&(command>=48)) modo=2; //Numeros
  else if ((command<78)&&(command>=65)) modo=3; //Letras de la 'A' a la 'M'
  else if ((command<92)&&(command>=78)) modo=5; //Letras de la 'N' a la 'Z' y la flecha
  else if ((command<110)&&(command>=97)) modo=4; //Letras de la 'a' a 'm'
  else if ((command<123)&&(command>=110)) modo=6; //Letras de la 'n' a la 'z'
  else modo=7; 
            
  byte gira_prov[7] = { B00000, B00000, B00000, B00000, B00000, B00000, B00000};
  
  for(int j = 0; j<10; j++){
    for(int i = 0; i<7; i++){
        gira_prov[i]=numero[j][6-i];
    }
    for(int i = 0; i<7; i++){
        numero[j][i]=gira_prov[i];
    }
  }
  
  for(int j = 0; j<13; j++){
    for(int i = 0; i<7; i++){
        gira_prov[i]=caracterA[j][6-i];
    }
    for(int i = 0; i<7; i++){
        caracterA[j][i]=gira_prov[i];
    }
  }
  
  for(int j = 0; j<14; j++){
    for(int i = 0; i<7; i++){
        gira_prov[i]=caracterB[j][6-i];
    }
    for(int i = 0; i<7; i++){
        caracterB[j][i]=gira_prov[i];
    }
  }
  
    //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);
  
  //Serial.print(13,BYTE);
  
  // Run the startup animation
  //startup();
}

void loop () {
   
  switch (modo) {
    case 1: if (finish) {letra(espacio,espacio); modo=0;} break;
    case 2: if (finish) {letra(numero[command-48],espacio); modo=0;} break;
    case 3: if (finish) {letra(caracterA[command-65],espacio); modo=0;} break;
    case 4: if (finish) {letra(caracterA[command-97],espacio); modo=0;} break;
    case 5: if (finish) {letra(caracterB[command-78],espacio); modo=0;} break;
    case 6: if (finish) {letra(caracterB[command-110],espacio); modo=0;} break;
    case 7: if (finish) {letra(sonrisa,espacio); modo=0;} break;
    case 8: letra(espacio,espacio); if (modo==8) modo=0; finish=1; break; 
    case 9: letra(test,espacio); if (modo==9) modo=0; finish=1; break; 
  }
  makemagic();
  
}

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

void setGreysW() {
  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
}

byte letra(byte let[7], byte let_ant[7]) {
  byte letbool=0;
  byte let_new[7] = { B00000, B00000, B00000, B00000, B00000, B00000, B00000};
  
  for(byte j = 1; j <6; ++j){
    for(byte h = 0; h <7; ++h){ 
      let_new[h]=((0X1F&(let_ant[h]<<j))|(let[h]>>(5-j)));
    }
    letbool=0;
      for(byte x = 0; x < 7; ++x){  
         for(byte y = 0; y <5; ++y){
             if (0x01&let_new[letbool]>>y) levelW[remap[x][y]] = intensidad;
             else levelW[remap[x][y]] = 0;
             }
           ++letbool;
         }
    for(int i = 0; i <20; ++i) makemagic();
  }
}