#include <avr/sfr_defs.h> 

#define  kNoteOff      0x80
#define  kNoteOn       0x90
#define  kPolyPres     0xA0
#define  kCtrlChng     0xB0
#define  kPgmChng      0xC0
#define  kChanPres     0xD0
#define  kPitchBend    0xE0
#define  kBeginSysex   0xF0
#define  kQuarterFrame 0xF1
#define  kSongPos      0xF2
#define  kSongSel      0xF3
#define  kUndef1       0xF4
#define  kUndef2       0xF5
#define  kTuneReq      0xF6
#define  kEndSysex     0xF7
#define  kRTClock      0xF8
#define  kRTUndef3     0xF9
#define  kRTSeqStart   0xFA
#define  kRTSeqCont    0xFB
#define  kRTSeqStop    0xFC
#define  kRTUndef4     0xFD
#define  kRTActiveSens 0xFE
#define  kRTSysReset   0xFF

#define  kCmdMask      0xF0
#define  kChanMask     0x0F

int valOne   = 0;
int valTwo   = 0;
int valThree = 0;
int valFour  = 0;



void setup()
{
  Serial.begin(31250);
  
}

/*#define mSetLed(pin, val)                 \
{                                         \
  switch(pin)                             \
  {                                       \
    case 0:digitalWrite(9, val);          \
    case 1:digitalWrite(10, val);         \
    case 2:digitalWrite(11, val);         \
    case 3:digitalWrite(12, val);         \
  }                                       \
}*/

void blinkLed(int pin)
{
  digitalWrite(pin, HIGH);
  delay(10);
  digitalWrite(pin, LOW);
  delay(10);
}

int GetEnable(int pin)
{
  switch(pin)
  {
    case 0:return digitalRead(5);
    case 1:return digitalRead(6);
    case 2:return digitalRead(7);
    case 3:return digitalRead(8);
  }
}

void midCtl(char ctlNo, char val)
{
  Serial.print(kCtrlChng, BYTE);
  Serial.print(ctlNo, BYTE);
  Serial.print(val, BYTE);
}




void loop()
 {
	int	i;
	int	newVal;
	int	oldVal[5];

        pinMode(12, OUTPUT);
        
        pinMode(4, INPUT);        
        pinMode(5, INPUT);
        pinMode(6, INPUT);
        //pinMode(5, INPUT);

	
	// blink led
	for (i = 1; i <= 3; i++) {
		digitalWrite(12, 1);
		delay(200);
		digitalWrite(12, 0);
		delay(200);
	}
	
	// main loop
        
	while(1) {
                delay(20);
                        while (Serial.available()){  //Built-in knob, ctl 9
                        }
                        newVal = (analogRead(3)/8);
                        if (oldVal[0] != newVal){
                                oldVal[0] = newVal;
                                midCtl(9, newVal);
                                blinkLed(12);
                        }
		for (i = 2; i <= 4; i++) {
                        
			if (digitalRead(i) == 1 && i == 2) {
				delay(20);	// needed after channel change
				while (Serial.available()) {  //if the serial port is transmitting, do nothing until finished
					// wait
				}
				newVal = (analogRead(i-2)/4);
				if (oldVal[i-2] != newVal) {
					// save the new value
					oldVal[i] = newVal;
					
					// output midi message
                                        midCtl(8+i, newVal);
					blinkLed(12);
				}
			}

                        else if (digitalRead(i)==1 && i != 2){
                          delay(20);
                          while (Serial.available()) {  //if the serial port is transmitting, do nothing until finished
					// wait
				}
				newVal = (analogRead(i-2)/8);
				if (oldVal[i-2] != newVal) {
					// save the new value
					oldVal[i] = newVal;
					
					// output midi message
                                        midCtl(8+i, ((newVal-32)*2)%128);
					blinkLed(12);
				}
			}
		}
	}
}