Basic Hitachi LCD Demo

hitachilcd.c

/////////////////////////////////////////////////////////////////////////////
// Basic Hitachi LCD Demo
/////////////////////////////////////////////////////////////////////////////

#include <hidef.h>      /* common defines and macros */
#include "derivative.h" /* derivative-specific definitions */

#include "pll.h"
#include "swled.h"
#include "timer.h"
#include "lcd.h"
#include "segs.h"

/////////////////////////////////////////////////////////////////////////////
// Main Entry
/////////////////////////////////////////////////////////////////////////////
void main(void)
{
  int i = 0;
  char szName[] = "AJ Armstrong";
  char szProgram[] = "Computer Engineering Technology";
  char * p = 0;

  // main entry point - these two lines must appear first
  _DISABLE_COP();
  EnableInterrupts;
  
  /////////////////////////////////////////////////////////////////////////////
  // one-time initializations
  /////////////////////////////////////////////////////////////////////////////
  PLL_To20MHz();
  (void) SWL_Init();
  (void) TMR_Init(eTMR_Prescale_128, 0, 0, eTMR_Pin_Toggle);
  (void) LCD_Init();
  (void) SEG_Init();

  //LCD now initialized and I have LCD_Inst() and LCD_Data()

  //Clear the LCD
  LCD_Inst(0x01);
  //Move cursor home
  LCD_Inst(0x02);
  //As currently configured, the LCD cursor will advance after
  //printing a character, so I don't have to move it manually
  //Let's write some characters:
  LCD_Data('C');
  LCD_Data('M');
  LCD_Data('P');
  LCD_Data('E');
  LCD_Data('1');
  LCD_Data('2');
  LCD_Data('5');
  LCD_Data('0');

  //But that is really tedious.  Can I just use a string?
  //Yep.  First, let's move the cursor to the next row:
  LCD_Inst(0x80 | 0x14); // 0x80 = command prefix to move cursor! 14 is row 3

  //Using array syntax:
  for (i = 0 ; szName[i] != 0 ; ++i)
    LCD_Data(szName[i]);

  //Move to row 2:
  LCD_Inst(0x80 | 0x40);
  //Using pointer syntax
  p = szProgram; // Pointer to first character
  while(*p) // while the character pointed to is not 0 (NUL)
    LCD_Data(*(p++)); //write character pointed to and increment pointer to next char

  //Let's try something fancier: 
  //Turn on shifting: 0x04 is entry mode; 0x02 is l to r; 0x01 is shift enabled
  LCD_Inst(0x04 | 0x02 | 0x01);
  //Main loop
  for (i = 0 ; ; ++i)
  {
    TMR_Sleep(500);
  // Set up a loop with 8 possibilities  
    switch(i % 16) // will iterate from 0 to 15 then restart
    {
      //Move right for first 8
      case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
        //0x10 = Cursor shift; 0x08 is Shift display; 0x04 is RtoL
        LCD_Inst(0x10 | 0x08 | 0x04);
      break;
      //Move left for the others
      default:
        //0x10 = Cursor shift; 0x08 is Shift display;
        LCD_Inst(0x10 | 0x08);
    }
  }
}