/**************************************************************************
* Alphanumeric LCD
* Developed by
* Advanced Electronics Systems, Bengaluru
*-------------------------------------------------------------------------
* Controller : LPC1768
* Project : ALS-SDA-AMCTXM3-06
* Port lines used: Data1 to Data4 - P0.23 to P0.26
* En - P0.28. RS - P0.27, RW - Ground
* Connection : CND to CNAB
***************************************************************************/
#include <lpc17xx.h>
#include "LCD.h"
#include "libs.h"
unsigned long int temp1=0, temp2=0 ;
unsigned char lcd_msg[15]={"TWO 16 BIT MUL="};
unsigned char add_result[10],k=0;
void display_string(void);
void display_string1(void);
//lcd initialization
void lcd_init()
{
// /* Ports initialized as GPIO */
// LPC_PINCON->PINSEL3 &= 0xFC003FFF; //P0.23 to P0.28
/* Ports initialized as GPIO */
LPC_PINCON->PINSEL4 &= 0xFFF000FF; //P2.4 to P2.9
/* Setting the directions as output */
LPC_GPIO2->FIODIR |= DT_CTRL;
LPC_GPIO2->FIODIR |= RS_CTRL;
LPC_GPIO2->FIODIR |= EN_CTRL;
clear_ports();
delay_lcd(3200);
temp2 = (0x30<<2);
wr_cn();
delay_lcd(30000);
temp2 = (0x30<<2);
wr_cn();
delay_lcd(30000);
temp2 = (0x30<<2);
wr_cn();
delay_lcd(30000);
temp2 = (0x20<<2);
wr_cn();
delay_lcd(30000);
temp1 = 0x28;
lcd_com();
delay_lcd(30000);
temp1 = 0x0c;
lcd_com();
delay_lcd(800);
temp1 = 0x06;
lcd_com();
delay_lcd(800);
temp1 = 0x01;
lcd_com();
delay_lcd(10000);
temp1 = 0x80;
lcd_com();
delay_lcd(800);
return;
}
void lcd_com(void)
{
temp2 = temp1 & 0xf0; //move data (26-8+1) times : 26 -
HN place, 4 - Bits
temp2 = temp2 << 2; //data lines from 23 to 26
wr_cn();
temp2 = temp1 & 0x0f; //26-4+1
temp2 = temp2 << 6;
wr_cn();
delay_lcd(1000);
return;
}
// command nibble o/p routine
void wr_cn(void) //write command reg
{
clear_ports();
LPC_GPIO2->FIOPIN = temp2; //Assign the value to the data
lines
LPC_GPIO2->FIOCLR = RS_CTRL; //clear bit RS
LPC_GPIO2->FIOSET = EN_CTRL; //EN=1
delay_lcd(25);
LPC_GPIO2->FIOCLR = EN_CTRL; //EN =0
return;
// data o/p routine which also outputs high nibble first
// and lower nibble next
void lcd_data(void)
{
temp2 = temp1 & 0xf0;
temp2 = temp2 << 2;
wr_dn();
temp2= temp1 & 0x0f;
temp2= temp2 << 6;
wr_dn();
delay_lcd(1000);
return;
}
// data nibble o/p routine
void wr_dn(void)
{
clear_ports();
LPC_GPIO2->FIOPIN = temp2; //Assign the value to the data
lines
LPC_GPIO2->FIOSET = RS_CTRL; //set bit RS
LPC_GPIO2->FIOSET = EN_CTRL; //EN=1
delay_lcd(25);
LPC_GPIO2->FIOCLR = EN_CTRL; //EN =0
return;
}
void delay_lcd(unsigned int r1)
{
unsigned int r;
for(r=0;r<r1;r++);
return;
}
void clr_disp(void)
{
temp1 = 0x01;
lcd_com();
delay_lcd(10000);
return;
}
void clear_ports(void)
{
/* Clearing the lines at power on */
LPC_GPIO2->FIOCLR = DT_CTRL; //Clearing data lines
LPC_GPIO2->FIOCLR = RS_CTRL; //Clearing RS line
LPC_GPIO2->FIOCLR = EN_CTRL; //Clearing Enable line
return;
}
void lcd_puts(unsigned char *buf1)
{
unsigned int i=0;
while(buf1[i]!='\0')
{
temp1 = buf1[i];
lcd_data();
i++;
if(i==16)
{
temp1 = 0xc0;
lcd_com();
}
}
return;
}
void LCD_DISP(unsigned int val)
{
unsigned char var1,var2;
lcd_init();
temp1 = 0x80; //cursor to begin at 1st line
lcd_com(); //commands for lcd
display_string(); //DISPLAY MASAGE OF STRING
temp1 = 0xc4; //cursor to begin at 1st line
sprintf(add_result,"%lx",val);
lcd_com(); //commands for lcd
display_string1(); //DISPLAY MASAGE OF STRING
}
// General function to display a string
void display_string()
{
k = 0;
while(lcd_msg[k] != 0x00)
{
temp1 = lcd_msg[k++]; //loading array in temp variable
lcd_data();
}
}
void display_string1()
{
k = 0;
while(add_result[k] != 0x00)
{
temp1 = add_result[k++]; //loading array in temp variable
lcd_data();
}
}
