/* General notes: 
 -if you are only using one max7219, then use the function maxSingle to control the little guy 
 --- maxSingle(register (1-8), collum (0-255)) 
 -if you are using more then one max7219, and they all should work the same, then use the function 
 --- maxAll ---maxAll(register (1-8), collum (0-255)) 
 -if you are using more than one max7219 and just want to change some thing at one little guy, then use the function maxOne 
 --- maxOne(Max you wane controll (1== the first one), register (1-8), collum (0-255)) 
/* During initiation, be sure to send every part to every max7219 and then upload it. For example, if you have 5 max7219's, you have to send the scanLimit 5 times before you load it-- other wise not every max7219 will get the data. the function maxInUse keeps track of this, just tell it how many max7219 you are using. 
 */
int dataIn = 2; 
int load = 3; 
int clock = 4; 
int maxInUse = 1; //change this variable to set how many MAX7219's you'll use 
int e = 0; // just a variable 
int j = 0;
int i = 0;
int i1 = 0;
int i2 = 1;
int i3 = 1;
int count=0;
int pinArray[] = {
  0x01, 0x02, 0x03, 0x04};
int val = 0;

// define max7219 registers
byte max7219_reg_noop = 0x00; 
byte max7219_reg_digit0 = 0x01; 
byte max7219_reg_digit1 = 0x02; 
byte max7219_reg_digit2 = 0x03; 
byte max7219_reg_digit3 = 0x04; 
byte max7219_reg_digit4 = 0x05; 
byte max7219_reg_digit5 = 0x06; 
byte max7219_reg_digit6 = 0x08; 
byte max7219_reg_digit7 = 0x01; 
byte max7219_reg_decodeMode = 0x09; 
byte max7219_reg_intensity = 0x0a; 
byte max7219_reg_scanLimit = 0x0b; 
byte max7219_reg_shutdown = 0x0c; 
byte max7219_reg_displayTest = 0x0f; 
int valor[] = { 
  0x7E,0x30,0x6D,0x79,0x33,0x5B,0x5F,0x70,0x7F,0x7B};

void putByte(byte data) { 
  byte i = 8;
  byte mask;
  while(i > 0) {
    mask = 0x01 << (i - 1);      // get bitmask
    digitalWrite( clock, LOW);   // tick
    if (data & mask){            // choose bit
      digitalWrite(dataIn, HIGH);// send 1
    }
    else{
      digitalWrite(dataIn, LOW); // send 0
    }
    digitalWrite(clock, HIGH);   // tock
    --i;                         // move to lesser bit
  }
} 

void maxSingle( byte reg, byte col) { //maxSingle is the "easy" function to use for a //single max7219 
  digitalWrite(load, LOW);       // begin     
  putByte(reg);                  // specify register
  putByte(col);                  //((data & 0x01) * 256) + data >> 1); // put data   
  digitalWrite(load, LOW);       // and load da shit
  digitalWrite(load,HIGH); 
} 
void maxAll (byte reg, byte col) { // initialize all MAX7219's in the system 
  int c = 0;
  digitalWrite(load, LOW);  // begin     
  for ( c =1; c<= maxInUse; c++) {
    putByte(reg);  // specify register
    putByte(col);  //((data & 0x01) * 256) + data >> 1); // put data
  }
  digitalWrite(load, LOW);
  digitalWrite(load,HIGH);
} 
void maxOne(byte maxNr, byte reg, byte col) { //maxOne is for adressing different MAX7219's, whilele having a couple of them cascaded 
  int c = 0;
  digitalWrite(load, LOW);  // begin     
  for ( c = maxInUse; c > maxNr; c--) {
    putByte(0);    // means no operation
    putByte(0);    // means no operation
  }
  putByte(reg);  // specify register
  putByte(col);  //((data & 0x01) * 256) + data >> 1); // put data 
  for ( c =maxNr-1; c >= 1; c--) {
    putByte(0);    // means no operation
    putByte(0);    // means no operation
  }
  digitalWrite(load, LOW); // and load da shit
  digitalWrite(load,HIGH); 
} 


void setup () { 
  pinMode(dataIn, OUTPUT);
  pinMode(clock,  OUTPUT);
  pinMode(load,   OUTPUT);
  beginSerial(9600);
  digitalWrite(13, HIGH);  
  //////////////////////////////////////////////initiation of the max 7219 
  maxAll(max7219_reg_scanLimit, 0x07);      
  maxAll(max7219_reg_decodeMode, 0x00);  // using an led matrix (not digits)
  maxAll(max7219_reg_shutdown, 0x01);    // not in shutdown mode
  maxAll(max7219_reg_displayTest, 0x00); // no display test
  for (e=1; e<=8; e++) {    // empty registers, turn all LEDs off 
    maxAll(e,0);
  }
  maxAll(max7219_reg_intensity, 0x0f & 0x0f);    // the first 0x0f is the value you can set
  // range: 0x00 to 0x0f
} 

void loop () { 

  
  switch (random(0,4))
  {
  case 0: 
    maxSingle(1,91); 
    maxSingle(2,6); 
    break;
  case 1: 
    maxSingle(3,126);  
    maxSingle(4,118);
    break;
  case 2:
    maxSingle(1,118); 
    maxSingle(2,126);
    break;
  case 3:
    maxSingle(3,6); 
    maxSingle(4,91);
    break;
  }
  delay(random(50,255));
  //delay(200);      
  //}
  /*
   maxSingle(4,8);                       //  - - - + - - - -
   maxSingle(5,16);                      //  - - - - + - - -
   maxSingle(6,32);                      //  - - - - - + - -
   maxSingle(7,64);                      //  - - - - - - + -
   maxSingle(8,128);                     //  - - - - - - - +
   */
  //------------------------------------

  // if you use more than 1 MAX7219, it should look like this
  /*
  maxAll(1,1);                       //  + - - - - - - -
   maxAll(2,3);                       //  + + - - - - - -
   maxAll(3,7);                       //  + + + - - - - -
   maxAll(4,15);                      //  + + + + - - - -
   maxAll(5,31);                      //  + + + + + - - -
   maxAll(6,63);                      //  + + + + + + - -
   maxAll(7,127);                     //  + + + + + + + -
   maxAll(8,255);                     //  + + + + + + + +
   */
  //------------------------------------

  // if you use more then 1 max7219 the second 1 should look like this
  /*
  maxOne(2,1,1);                       //  + - - - - - - -
   maxOne(2,2,2);                       //  - + - - - - - -
   maxOne(2,3,4);                       //  - - + - - - - -
   maxOne(2,4,8);                       //  - - - + - - - -
   maxOne(2,5,16);                      //  - - - - + - - -
   maxOne(2,6,32);                      //  - - - - - + - -
   maxOne(2,7,64);                      //  - - - - - - + -
   maxOne(2,8,128);                     //  - - - - - - - +
   //------------------------------------
   */

} 


void off(void){
  for (count=0;count<4;count++) {
    digitalWrite(pinArray[count], HIGH);
  }
}