Lab 5 - Datalogger -> SD

/* Rotary encoder test code
 * Modified from http://www.circuitsathome.com/mcu/programming/reading-rotary-encoder-on-arduino
 * by Oleg
 */
 // include the library code:
#include <LiquidCrystal.h>
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

#define ENC_A 0
#define ENC_B 1
#define RED 10
#define GREEN 9
#define BLUE 14
#define BUTTON A8
#define PUSHBTN 8
#define ENC_PORT PINB

int activeColor = 0; //R,G,B
int red = 0;
int green = 0;
int blue = 0;

#include <SD.h>
const int chipSelect = 12;

#include <EEPROM.h>

// the current address in the EEPROM (i.e. which byte
// we're going to write to next)
int addrRed = 0;
int addrGreen = 1;
int addrBlue = 2;
int addrActive = 3;

File dataFile;


void initSD(){
  Serial.begin(9600);
  Serial.print("Initializing SD card...");
  // see if the card is present and can be initialized:
  if (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
    // don't do anything more:
    return;
  }
  Serial.println("card initialized.");
}

void setup()
{
  initSD();
  lcd.begin(16, 2);
  /* Setup encoder pins as inputs */
  pinMode(ENC_A, INPUT_PULLUP);
  pinMode(ENC_B, INPUT_PULLUP);
  pinMode(RED, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(BLUE, OUTPUT);
  pinMode(BUTTON, INPUT);
  makeWhite();
  red = EEPROM.read(addrRed);
  green = EEPROM.read(addrGreen);
  blue = EEPROM.read(addrBlue);
  activeColor = EEPROM.read(addrActive);
  setRed();
  setGreen();
  setBlue();
  updateDisplay();
  Serial.begin (9600);
  Serial.println("Start");
}

int updateColor(int current, int delta){
  int temp = current+delta;
  if(temp > 255) return 255;
  if(temp < 0) return 0;
  return temp;
}

void loop()
{
  static unsigned long counter4x = 0;      //the SparkFun encoders jump by 4 states from detent to detent
  static unsigned long counter = 0;
  static unsigned long prevCounter = 0;

  int tmpdata;

  if (digitalRead(BUTTON))
  {
    activeColor = (activeColor+1)%3;
    EEPROM.write(addrActive, activeColor);
    Serial.println("activeColor: " + (String)activeColor);
    updateDisplay();
    delay(250);
  }

  tmpdata = read_encoder();
  if( tmpdata ) {
    if (digitalRead(PUSHBTN)){
      tmpdata *= 5;
    }
    counter4x += tmpdata;
    counter = counter4x/4;
    if (prevCounter != counter){
      Serial.print("Counter value: ");
      Serial.println(counter);

      switch(activeColor){
       case 0:
               red = updateColor(red, tmpdata);
               setRed();
               break;
       case 1:
               green = updateColor(green, tmpdata);
               setGreen();
               break;
       case 2:
               blue = updateColor(blue, tmpdata);
               setBlue();
               break;
       default:
        break;

      }
      /* Light up the LEDs with all possible color combinations - raster scan
      analogWrite(RED, counter % 255);
      analogWrite(GREEN, (counter/255) % 255);
      analogWrite(BLUE, (counter/255/255) % 255);*/
    }
    updateDisplay();
    prevCounter = counter;
    dataFile = SD.open("datalog.txt", FILE_WRITE);
    dataFile.println("RGB=(" + (String)red + "," + (String)green + "," + (String)blue +")");
    dataFile.close();
  }
}

void setRed(){
  EEPROM.write(addrRed, red);
  analogWrite(RED, 255-red);
  Serial.print("R: ");
  Serial.println(red);
}

void setGreen(){
  EEPROM.write(addrGreen, green);
  analogWrite(GREEN, 255-green);
  Serial.print("G: ");
  Serial.println(green);
}

void setBlue(){
  EEPROM.write(addrBlue, blue);
  analogWrite(BLUE, 255-blue);
  Serial.print("B: ");
  Serial.println(blue);
}

/* returns change in encoder state (-1,0,1) */
int read_encoder()
{
  static int enc_states[] = {0,-1,1,0,1,0,0,-1,-1,0,0,1,0,1,-1,0};
  static unsigned char old_AB = 0;
  /**/
  old_AB <<= 2;                   //remember previous state
  old_AB |= ( ENC_PORT & 0x03 );  //add current state
  return ( enc_states[( old_AB & 0x0f )]);
}

void updateDisplay(){
 lcd.clear();
 lcd.setCursor(0,0);
 lcd.print("RGB=(" + (String)red + "," + (String)green + "," + (String)blue +")");
 lcd.setCursor(activeColor,1);
 lcd.print("^");
}

/* turn on all the LEDs, so it's white */
void makeWhite()
{
  analogWrite(RED, 0);
  analogWrite(GREEN, 0);
  analogWrite(BLUE, 0);
}