/*  ***************  LCD12.C ******************************

    LCD Display (HD44780) on PortH, PORTJ

    sizes range from 1*16 to 4*40

  ground = pin 1    Vss

  power  = pin 2    Vdd   +5V

  10Kpot = pin 3    Vlc   contrast adjust 0 to +5V

  PJ2    = pin 6    E     (enable)

  PJ1    = pin 5    R/W   (1 for read, 0 for write)

  PJ0    = pin 4    RS    (1 for data, 0 for control/status)

  PH0-7  = pins7-14 DB0-7 (8 bit data)*/

// Last modified 1/3/03 by Jonathan W. Valvano

 

// Copyright 2003 by Jonathan W. Valvano, valvano@uts.cc.utexas.edu 

//    You may use, edit, run or distribute this file 

//    as long as the above copyright notice remains 



#define LCDDATA    1 // PJ0=RS=1

#define LCDCSR     0 // PJ0=RS=0

#define LCDREAD    2 // PJ1=R/W=1

#define LCDWRITE   0 // PJ1=R/W=0

#define LCDENABLE  4 // PJ2=E=1

#define LCDDISABLE 0 // PJ2=E=0



void static cycwait(unsigned int cycles){

  TC5 = TCNT+cycles;  // number of 500ns cycles to wait

  TFLG1 = 0x20;       // clear C5F

  while((TFLG1&0x20)==0){};

}

  

void LCD_OutChar(char letter){ // letter is ASCII code

  PORTH = letter;

  PORTJ = LCDDISABLE+LCDWRITE+LCDDATA;

  PORTJ = LCDENABLE+LCDWRITE+LCDDATA;  // E goes 0,1

  PORTJ = LCDDISABLE+LCDWRITE+LCDDATA; // E goes 1,0

  cycwait(180);     // 90 us wait, clear C5F

}

void LCD_OutCsr(char command){

  PORTH = command;

  PORTJ = LCDDISABLE+LCDWRITE+LCDCSR;

  PORTJ = LCDENABLE+LCDWRITE+LCDCSR;  // E goes 0,1

  PORTJ = LCDDISABLE+LCDWRITE+LCDCSR; // E goes 1,0

  cycwait(180);     // 90 us wait, clear C5F

}

void LCD_Clear(void){

  LCD_OutCsr(0x01);   // Clear Display

  cycwait(3280);      // 1.64ms wait

  LCD_OutCsr(0x02);   // Cursor to home

  cycwait(3280);      // 1.64ms wait

}

void LCD_Init(void){

  DDRH = 0xFF; DDRJ = 0xFF;

  TIOS |= 0x20;       // enable OC5

  TSCR  = 0x80;       // enable, no fast clear

  TMSK2 = 0x22;       // to specify 500 ns clock

// Be careful, TMSK2 and TSCR maybe set in other rituals

  LCD_OutCsr(0x06);   // I/D=1 Increment, S=0 nodisplayshift

  LCD_OutCsr(0x0C);   // D=1 displayon, C=0 cursoroff, B=0 blinkoff

  LCD_OutCsr(0x14);   // S/C=0 cursormove, R/L=0 shiftright

  LCD_OutCsr(0x38);   // DL=1 8bit, N=0 1 line, F=0 5by7dots

  LCD_Clear(); }      // clear display



//---------------------LCD_OutString--------------

// Output String (NULL termination)

void LCD_OutString(char *pt){ char letter;

  while (letter=*pt++){

    LCD_OutChar(letter);

  }

}