/*LCD Test written by Derrick Huestis (Pi-Ro)
 * 
 * This code will drive a 16x1
 * lcd with memory set up in two
 * 8 caracter blocks.
 * 
 * It is my first C program, so
 * let me know if it has problems!
 *
 * pinout:
 * lcdpin1----ground   LCD Ground
 * lcdpin2----5v       Supply Voltage
 * lcdpin3----ground   Contrast Adjustment
 * lcdpin4----P1.7	   Data/Instruction select
 * lcdpin5----ground   Read/Write
 * lcdpin6----P1.6     Enable
 * lcdpin7----ground   Unused pins for 8 bit mode
 * lcdpin8----ground
 * lcdpin9----ground
 * lcdpin10---ground
 * lcdpin11---P1.0     Data pins
 * lcdpin12---P1.3
 * lcdpin13---P1.4
 * lcdpin14---P1.5
 */

#include <msp430g2211.h>  //change this if you are using a different chip

int main()
{
	// message for the lcd
	char lcd[16] = "Hello There!    ";  //note: this message will end with black squares
                                     // if it doesn't have spaces for the last 4 characters
	
	WDTCTL = WDTPW + WDTHOLD;      /* Stop watchdog timer */
	
  
  P1DIR = BIT0 + BIT3 + BIT4 + BIT5    + BIT6 + BIT7;   // output lcd pins
  P1OUT = 0;
  _delay_cycles(1000000);   //pause to ensure the lcd is on
  
// ----- initialize lcd ----
// This section would look a lot better if I could figure out how to use function
// routines, but I just had errors when I tried so I will clean it up
// when I learn how to do it properly
//-------------------------
  P1OUT |= BIT3   + BIT6;   // Function set routine
  _delay_cycles(1000);
  P1OUT &= ~BIT3  + BIT6;
  _delay_cycles(1500);

  P1OUT |= BIT3   + BIT6;   // and repeat in 4-bit mode to declare 2 line mode
  _delay_cycles(500);
  P1OUT &= ~BIT3  + BIT6;
  _delay_cycles(500);

  P1OUT |= BIT5  +BIT6;			// finish last 4 bits of function routine
  _delay_cycles(500);
  P1OUT = 0;
  _delay_cycles(350000);	// delay for the lcd to start up
 
  P1OUT |= BIT6;			// Display on, turn on cursor and blink
  _delay_cycles(500);      //first 4 bits
  P1OUT = 0;
  _delay_cycles(500);  
  
  P1OUT |= BIT5 + BIT3 + BIT4 + BIT0  + BIT6;  // last 4 bits of display on routine
  _delay_cycles(500);
  P1OUT = 0;
  _delay_cycles(500);    


  int i,d,e,p,q;			//declare variables needed to run the lcd
  
  d = 0; 					//must be set to 0 before using bitwise, it will be the output for the pins
  e = 0;					//this variable incruments to display different characters of the message
 for(p=0;p<2;p++) { 	//the code loops twice with a command after 8 characters to change memory address
   for(q=0;q<8;q++) {	//this will loop 16 times for 16 characters
  	
  	d = 0;
  	
  	i = lcd[e];		//first 4 pinouts
  	i >>= 4;		//this uses bitwise to skip over P1.1 and P1.2 used for serial communication
	i &= 1;			//it breaks the character into the first 4 bits
	d |= i;		
	i = lcd[e];
	i >>= 5;
	i &= 7;
	i <<= 3;
	d |= i;

  P1OUT = d;				//send first 4 bits to lcd
  P1OUT |= BIT6 + BIT7;
  _delay_cycles(500);  
  P1OUT = 0x80;
  _delay_cycles(500);  
  
  d = 0;
  
  	i = lcd[e];		//last 4 pinouts	
	i &= 1;			//same as above, but it breaks the pinouts into the last 4 bits
	d |= i;		
	i = lcd[e];
	i >>= 1;
	i &= 7;
	i <<= 3;
	d |= i;
	
  P1OUT = d;			//send last 4 bits to lcd
  P1OUT |= BIT6 + BIT7;
  _delay_cycles(500);  
  P1OUT = 0;
  _delay_cycles(500);   
 
 e++;				//get ready to send next character
 }

 if(p<1) {
 P1OUT |= BIT5 + BIT3  + BIT6;	//this will change the address of the lcd
  _delay_cycles(500);  			//so additional text will flow across lcd
  P1OUT = 0;					//instead of acting like an 8x2 lcd
  _delay_cycles(500); 
  
   P1OUT |= BIT5  + BIT6;		//last 4 bits
  _delay_cycles(500);  
  P1OUT = 0;
  _delay_cycles(500); 
  
  }
 }
 _BIS_SR(LPM4_bits);		//program complete, enter low power mode
}