/* LCD display with 4 DataPins
* --------
*
* This is a example in how to use an LCD screen
* configured with data transfers over 2 x 4 bits. The example
* based on the "LCD Hola example" by DojoDave.
*  
* There are the following pins to be considered:
*
* - DI, RW, DB0..DB3, Enable (7 in total)
*
* the pinout for LCD displays is standard and there is plenty
* of documentation to be found on the internet.
*
* (cleft) 2006 Tomek for K3 and fh-potsdam
*
*/
int led = 13;
int DI = 12;
int RW = 11;
int DB[] = { 7, 8, 9, 10};
int Enable = 6;
int count = 0;

void LcdCommandWrite(int value) {
int i = 0;
int value1 = 0;
value1 = value;

value1 >>= 4;               //send the first 4 databits (from 8) + RW and DI
for (i=DB[0]; i <= DI; i++) {
  digitalWrite(i,value1 & 01);
  value1 >>= 1;
}
digitalWrite(Enable,LOW);   // send a pulse to enable
delayMicroseconds(1);
digitalWrite(Enable,HIGH);
delayMicroseconds(1);
digitalWrite(Enable,LOW);
delayMicroseconds(1); //    pause 1 ms according to datasheet
delay(1);

for (i=DB[0]; i <= DB[3]; i++) {  // secound part of the secound 4 bits (from 8)
  digitalWrite(i,value & 01);
  value >>= 1; 
}
value >>= 4;                 // send the RW and DI of the secound 4 bits(from 8) 
for (i=RW; i <= DI; i++) {
  digitalWrite(i,value & 01);
  value >>= 1;
}
digitalWrite(Enable,LOW); // send a pulse to enable
delayMicroseconds(1);
digitalWrite(Enable,HIGH);
delayMicroseconds(1);
digitalWrite(Enable,LOW);
delayMicroseconds(1); // pause 1 ms according to datasheet
}

void LcdDataWrite(int value) {
int i = 0;
int value1 = 0;
digitalWrite(DI, HIGH);
digitalWrite(RW, LOW);
value1 =value;
value1 >>= 4;                     //send the first 4 databits (from 8) 
for (i=DB[0]; i <= DB[3]; i++) {
  digitalWrite(i,value1 & 01);
  value1 >>= 1;
}
digitalWrite(Enable,LOW);   // send a pulse to enable
delayMicroseconds(1);
digitalWrite(Enable,HIGH);
delayMicroseconds(1);
digitalWrite(Enable,LOW);
delayMicroseconds(1);   // pause 1 ms according to datasheet
delay(1);
digitalWrite(DI, HIGH);
digitalWrite(RW, LOW);
for (i=DB[0]; i <= DB[3]; i++) {
  digitalWrite(i,value & 01);
  value >>= 1;
}
digitalWrite(Enable,LOW);   // send a pulse to enable
delayMicroseconds(1);
digitalWrite(Enable,HIGH);
delayMicroseconds(1);
digitalWrite(Enable,LOW);
delayMicroseconds(1); // pause 1 ms according to datasheet
}

// this funktion help us to write number over 9, easyely in the lcd display

void LcdNumberWrite(int nr) {

int n1 = 0;
int n2 = 0;

n1 = n2 = nr;

n1 = n1 / 100;
LcdCommandWrite(560 + n1);  //512 used to wirte data (see commands for character modul)
n2 = (n2 - n1 * 100) / 10;
LcdCommandWrite(560 + n2);  //512 used to wirte data (see commands for character modul)
nr = nr - n1 *100 - n2 * 10;
LcdCommandWrite(560 + nr);  //512 used to wirte data (see commands for character modul)
}

void setup (void) {

int i = 0;
for (i=Enable; i <= DI; i++) {
pinMode(i,OUTPUT);
}
delay(100);
// initiatize lcd after a short pause
// needed by the LCDs controller

///////////////////////////////////////////////////// 4 pin initialization
LcdCommandWrite(0x03); // function set:
// 4 pin initialization
delay(64);
LcdCommandWrite(0x03); // function set:
// 4 pin initialization
delay(50);
LcdCommandWrite(0x03); // function set:
// 4 pin initialization
delay(50);
LcdCommandWrite(0x02); // function set:
// 4 pin initialization
delay(50);
LcdCommandWrite(0x2C); // function set:
// 4-bit interface, 1 display lines, 5x7 font
///////////////////////////////////////////////////// end of 4 pin initialization 

delay(20);
LcdCommandWrite(0x06); // entry mode set:
// increment automatically, no display shift
delay(20);
LcdCommandWrite(0x0E); // display control:
// turn display on, cursor on, no blinking
delay(20);
LcdCommandWrite(0x01); // clear display, set cursor position to zero
delay(100);

LcdCommandWrite(0x80); // display control:
delay(20);


//////// unter this line are the special stuff you don't need for a initialitzation

LcdCommandWrite(0x0F); //  cursor blink
delay(10);
}

void loop (void) {

//>>>>>>>>>>>>>>>>>>>>>>>>>>>possible commands for the Lcd Display>>>>>>><< able to use for LcdDisplays with 4 or with 8 DataPins

//LcdCommandWrite(0x01); // clear display, set the cursor to home position
//LcdCommandWrite(0x02); // set cursor position to zero
//LcdCommandWrite(0x0A); // set the display off 
//LcdCommandWrite(0x0E); // set the display on and with out cursor blink
//LcdCommandWrite(0x0F); // set the display on and  with cursor blink
//LcdCommandWrite(0x0F); //  cursor blink
//LcdCommandWrite(0x0E); //  cursor not blink
//LcdCommandWrite(0x18); // shift display and cursor to the left
//LcdCommandWrite(0x1c); // shift display and cursor to the right
//LcdCommandWrite(0x14); // shift cursor to the right
//LcdCommandWrite(0x10); // shift cursor to the left

//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> example <<<<<<<<<

LcdCommandWrite(0x02); // set cursor position to zero
delay(10);

// Write the message

//like this
LcdDataWrite('L');
LcdDataWrite('c');
LcdDataWrite('d');

//or like this
for ( count = 0; count<=7; count++) {
  int wrote [] = { 'D', 'i', 's', 'p', 'l', 'a', 'y',  ' ',};
LcdDataWrite(wrote[count]);
} 

LcdDataWrite('w');
LcdDataWrite('i');
LcdDataWrite('t');
LcdDataWrite('h');
LcdDataWrite(' ');

// and Number over 9 easyely like this
LcdNumberWrite(4);

LcdDataWrite('P');
LcdDataWrite('i');
LcdDataWrite('n');
LcdDataWrite('s');



delay(3000);
}