/*    Serial LCD

//These comments I received from Joel Murphy
*
* communicate with Parallax Serial LCD screen
* using the pin 4 on the ATMEL (2 on Arduino). it will work on pin 3 (Arduino tx pin 1).
* Serial Signal needs to be TRUE. This code modifies SoftSerial from the Playground.
* Delay timing in uS tweaked to perfection +-2
*
*/

//       TEST ALL THREE OF THESE TIMING DELAYS AND TWEAK THEM AS NEEDED
#define bit24 396          //timing for 2.4Kbaud
#define halfBit24 198      // 1/2400 = .000416

#define bit96 100          //timing for 9.6Kbaud
#define halfBit96 50      // 1/9600 = .000104

#define bit192 47          //timing for 19.2Kbaud
#define halfBit192 23      // 1/19200 = .000052
//end of comments and defined variables from Joel Murphy


//These are the 4 custom characters I created to draw an approximate sine wave on the LCD
//First value is choosing to assign values to a custom character
//Next 8 values are the 8 rows for each character on the LCD
//Last value is telling the LCD to print my new custom character
byte first [11] = {248, 3, 4, 8, 16, 0, 0, 0, 0, 0};
byte second [11] = {249, 24, 4, 2, 1, 0, 0, 0, 0, 1};
byte third [11] = {250, 0, 0, 0, 0, 16, 8, 4, 3, 2};
byte fourth [11] = {251, 0, 0, 0, 0, 1, 2, 4, 24, 3};


int LCD = 2;    //LCD control line
byte outByte = 0;
int i;
int count = 0;    //this count helps with the animation of the custom characters

void setup(){
pinMode (LCD,OUTPUT);
digitalWrite(LCD,HIGH);
delay(1000);
SWprint(12);  //clear lcd and reset cursor to 0/0
SWprint(128);    //return to line 0, position 0

delay(100);
SWprint(17);  //turn on backlight
delay(100);

}

//this loop counts out through the number of frames it is going through before it moves to the
//next permutation of the sine wave
void loop(){

  for(count=0; count<=32; count++) {
  if (count <= 7) { 
    getOne();
    delay(5);  
} else if (count<=15) {
    getTwo();
    delay(5);  
  } else if (count<=23) {
    getThree();
    delay(5);  
  } else if (count <=31) {
    getFour();
    delay(5);  
  } else if (count == 31) {
    count=0;
    delay(1000);
  }
}
}

//by rotating backwards through each of the the different permutations, it gives the look that
//the sine wave is moving forwards through the LCD screen

void getOne(){
    for(i=0; i<=9; i++){
      SWprint(first[i]);  }
    for(i=0; i<=9; i++){
      SWprint(second[i]); }
    for(i=0; i<=9; i++){
      SWprint(third[i]);  }
    for(i=0; i<=9; i++){
      SWprint(fourth[i]); }
}
  
void getTwo(){
   for(i=0; i<=9; i++){
    SWprint(fourth[i]); } 
   for(i=0; i<=9; i++){
    SWprint(first[i]);  }
   for(i=0; i<=9; i++){
    SWprint(second[i]); }
   for(i=0; i<=9; i++){
    SWprint(third[i]);  } 
}  

void getThree(){
  for(i=0; i<=9; i++){
    SWprint(third[i]);  } 
  for(i=0; i<=9; i++){
    SWprint(fourth[i]); } 
  for(i=0; i<=9; i++){
    SWprint(first[i]);  }
  for(i=0; i<=9; i++){
    SWprint(second[i]); }
}

void getFour(){
  for(i=0; i<=9; i++){
    SWprint(second[i]); }
  for(i=0; i<=9; i++){
    SWprint(third[i]);  } 
  for(i=0; i<=9; i++){
    SWprint(fourth[i]); } 
  for(i=0; i<=9; i++){
    SWprint(first[i]);  }
}

//this is code I received from Joel Murphy
//this is what keeps time for the serial communication with the LCD
void SWprint(byte data){
 byte mask;
 digitalWrite(LCD,LOW);                        //startbit
 delayMicroseconds(bit96);
 for (mask = 0x01; mask>0; mask <<= 1) {
  if ((data & mask) > 0){                          // choose bit
   digitalWrite(LCD,HIGH);                    // send 1
  }else{
   digitalWrite(LCD,LOW);                     // send 0
  }
  delayMicroseconds(bit96);
 }
 //stop bit
 digitalWrite(LCD, HIGH);
 delayMicroseconds(bit96);
}