Writ e a Embedded C code for LCD Interface ARM Processor.

Writ e a Embedded C code for LCD Interface ARM Processor.

#include <nxp/iolpc2148.h>

#define LCD_EN    0X00000800

#define RS        0X00000100

#define DIOW              0X00000200

unsigned char arr1[16]="Vi Microsystems ";

unsigned char arr2[16]="    Chennai..   ";

void delay_ms()

{

    unsigned int i,j;

    for(j=0;j<0xf;j++)

    for(i=0;i<0xff;i++);

}

void busy_check()  

{

     delay_ms();    

}

void command_write(int comm)

{  

    busy_check();         

    IO0CLR  = RS;

    IO0CLR  = DIOW;

    IO1PIN  = comm<<16;     

    IO0SET  = LCD_EN;

    IO0CLR  = LCD_EN;

 

}

void lcd_init()

{

  command_write(0x38);    // 5 * 7 Matrix

  command_write(0x01);    // Clear Display

  command_write(0x0f);    // Display ON and Cursor Blinking

  command_write(0x86);    // 5 * 7 Matrix

  command_write(0x06);        

}  

void lcd_out(unsigned char z)

{

    busy_check();

    IO0SET = RS;        //RS    = 1

    IO0CLR = DIOW;            

    IO1PIN = (z<<16); //data with Rs=1   

    IO0SET = LCD_EN;

    IO0CLR = LCD_EN;

 

}

void main()

{

   

  //--------------------Used Port Lines--------------------------//

  //LCD0-LCD7  - P1.16 to P1.23                                  //

  //RS -  P0.8                                                   //

  //DIOW - P0.9                                                  //

  //LCDEN2 - P0.11                                               //

  //-------------------------------------------------------------//

 

  PINSEL2=0x00000000;      

  IO0DIR =0xffffffff;   // RS, DIOW & LCDEN - Output Pins

  IO1DIR =0xFFFFFFFF;   // LCD0 to LCD7     - Output Pins

 

 

  IO0DIR =0x5FFF7FFF; 

  IO1DIR =0xFFFFFFFF;

 

 

    IO0CLR  = 0X00000800;

    IO1PIN  = 0X00000000;

    IO0PIN  = 0X00000000;

 

    IO0CLR  = RS;

    IO0CLR  = DIOW;

    IO0CLR  = LCD_EN;

   

     

  lcd_init();

  command_write(0x80);

 

  for(int i=0;i<16;i++)

  lcd_out(arr1[i]);

 

   

  command_write(0xC0);

 

  for(int i=0;i<16;i++)

  lcd_out(arr2[i]);

 

  while(1);

  

  

}

Share on Google Plus

About CONSPEAR TECH