#include <SPI.h>


// Definition des Datenpaketes
// Länge: 1 Byte
// Adressierung der LED: 5 Bit
// Maske: 0xF8
// Helligkeitswert: 3 Bit
// Maske: 0x7
// Dadurch 31 LEDs adressierbar mit 7 Helligkeitswerten
//
// * CS - to digital pin 10  (SS pin)
// * SDI - to digital pin 11 (MOSI pin)
// * SDI - to digital pin 12 (MISO pin)
// * CLK - to digital pin 13 (SCK pin)



// Vorbereitungen um als Slave Daten zu empfangen
byte recieve_buff [255];
volatile byte pos;
volatile boolean process_it;

// PINS fuer SPI
const int slaveSelectPin = 10;
const int miso = 12;
const int mosi = 11;

const int ledPin = 2;

//Array fuer Helligkeitswerte Led, 2te Dimension gibt Position im Muster wieder
byte brightnessMatrix[31][2];

//Array fuer Led Pin Adressen
byte ledAdresse[31];

//Fuer For Schleifen im Loop
int brightLimit = 100;
int posLed = 3;


// Matrix fuer Helligkeitsmuster
int bitMusterHelligkeit[][100] =
{
  {
    0,0,0,0,0,0,0,0,2      }
  ,
  {
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,2      }
  ,
  {
    0,0,0,0,0,0,1,0,0,0,0,0,0,1,2      }
  ,
  {
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,2      }
  ,
  {
    0,0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0,0,1,1,1,2      }
  ,
  {0,1,1,1,0,1,1,1,2 },
  {0,1,1,1,0,1,1,1,2 },
  {
    1,1,1,1,1,1,1,1,2      }
};



void setup() {   
  Serial.begin (115200);   // debugging

  pinMode(slaveSelectPin, INPUT); 
  pinMode(miso, OUTPUT);

  // SPI als Slave aktivieren
  SPCR |= _BV(SPE);

  // interrupt vorbereitung
  pos =0; //recieve Buffer leer
  process_it = false;
  SPI.attachInterrupt();


  //Leds initialisieren
  for(int i=0;i<31;i++){
    brightnessMatrix[i][1]=0;
  }

  // initialize the digital pin as an output.
  pinMode(ledPin, OUTPUT);

  digitalWrite (ledPin, HIGH);
  delay(1000);
  digitalWrite (ledPin, LOW);


}

//Interrupt fuer SPI
ISR (SPI_STC_vect)
{
  byte buffer = SPDR;
  //Schreibt im Array an die Adresse im Datenpaket den Wert
    brightnessMatrix[2][0]=SPDR&0x07;
    
//  brightnessMatrix[SPDR&0xf8][0]=SPDR&0x07;
  digitalWrite (ledPin, HIGH);

  digitalWrite (ledPin, LOW);

}


void loop()
{
  Serial.println(brightnessMatrix[2][0]);
  for(int i=0;i<31;i++){

    if(brightnessMatrix[i][0]){
      digitalWrite(/*ledAdresse[i]*/2,HIGH);
      brightnessMatrix[i][1]==brightnessMatrix[i][1]++; 
    }
    else if(brightnessMatrix[i][0]==0){

      digitalWrite(/*ledAdresse[i]*/2,LOW);
    }
    else {
      brightnessMatrix[i][1]=0;
    }

  }
  
  
}