Microprocessor and Microcontroller Lab 12 | Read Now
Microprocessor and Microcontroller Lab 12
12] To interface LCD with ARM processor — ARM7TDMI/LPC2148. write and execute programs in C language for displaying text messages and numbers on LCD
12] Program code (lab12.c)
#include<lpc214x.h>
#include<stdio.h>
//Function prototypes
void lcd_init(void);
void wr_cn(void);
void clr_disp(void);
void delay(unsigned int);
void lcd_com(void);
void wr_dn(void);
void lcd_data(void);
unsigned char temp1;
unsigned long int temp,r=0;
unsigned char *ptr,disp[] = " HI HELLO ",disp1[] = "HOW ARE YOU";
int main()
{
PINSEL0 = 0X00000000;
IO0DIR = 0x000000FC;
lcd_init();
delay(3200);
clr_disp();
delay(3200);
temp1 = 0x81;
lcd_com();
ptr = disp;
while(*ptr!='\0')
{
temp1 = *ptr;
lcd_data();
ptr ++;
}
temp1 = 0xC0;
lcd_com();
ptr = disp1;
while(*ptr!='\0')
{
temp1 = *ptr;
lcd_data();
ptr ++;
}
while(1);
}
void lcd_init(void)
{
temp = 0x30;
wr_cn();
delay(3200);
temp = 0x30;
wr_cn();
delay(3200);
temp = 0x30;
wr_cn();
delay(3200);
temp = 0x20;
wr_cn();
delay(3200);
temp1 = 0x28;
lcd_com();
delay(3200);
temp1 = 0x0C;
lcd_com();
delay(800);
temp1 = 0x06;
lcd_com();
delay(800);
temp1 = 0x80;
lcd_com();
delay(800);
}
void lcd_com(void)
{
temp = temp1 & 0xf0;
wr_cn();
temp = temp1 & 0x0f;
temp = temp << 4;
wr_cn();
delay(500);
}
void wr_cn(void)
{
IO0CLR = 0x000000FC;
IO0SET = temp;
IO0CLR = 0x00000004;
IO0SET = 0x00000008;
delay(10);
IO0CLR = 0x00000008;
}
void wr_dn(void)
{
IO0CLR = 0x000000FC;
IO0SET = temp;
IO0SET = 0x00000004;
IO0SET = 0x00000008;
delay(10);
IO0CLR = 0x00000008;
}
void lcd_data(void)
{
temp = temp1 & 0xf0;
temp = temp ;//<< 6;
wr_dn();
temp= temp1 & 0x0f;
temp= temp << 4;
wr_dn();
delay(100);
}
void clr_disp(void)
{
temp1 = 0x01;
lcd_com();
delay(500);
}
void delay(unsigned int r1)
{
for(r=0;r<r1;r++);
}
#include<lpc214x.h>
#include<stdio.h>
//Function prototypes
void lcd_init(void);
void wr_cn(void);
void clr_disp(void);
void delay(unsigned int);
void lcd_com(void);
void wr_dn(void);
void lcd_data(void);
unsigned char temp1;
unsigned long int temp,r=0;
unsigned char *ptr,disp[] = " HI HELLO ",disp1[] = "HOW ARE YOU";
int main()
{
PINSEL0 = 0X00000000;
IO0DIR = 0x000000FC;
lcd_init();
delay(3200);
clr_disp();
delay(3200);
temp1 = 0x81;
lcd_com();
ptr = disp;
while(*ptr!='\0')
{
temp1 = *ptr;
lcd_data();
ptr ++;
}
temp1 = 0xC0;
lcd_com();
ptr = disp1;
while(*ptr!='\0')
{
temp1 = *ptr;
lcd_data();
ptr ++;
}
while(1);
}
void lcd_init(void)
{
temp = 0x30;
wr_cn();
delay(3200);
temp = 0x30;
wr_cn();
delay(3200);
temp = 0x30;
wr_cn();
delay(3200);
temp = 0x20;
wr_cn();
delay(3200);
temp1 = 0x28;
lcd_com();
delay(3200);
temp1 = 0x0C;
lcd_com();
delay(800);
temp1 = 0x06;
lcd_com();
delay(800);
temp1 = 0x80;
lcd_com();
delay(800);
}
void lcd_com(void)
{
temp = temp1 & 0xf0;
wr_cn();
temp = temp1 & 0x0f;
temp = temp << 4;
wr_cn();
delay(500);
}
void wr_cn(void)
{
IO0CLR = 0x000000FC;
IO0SET = temp;
IO0CLR = 0x00000004;
IO0SET = 0x00000008;
delay(10);
IO0CLR = 0x00000008;
}
void wr_dn(void)
{
IO0CLR = 0x000000FC;
IO0SET = temp;
IO0SET = 0x00000004;
IO0SET = 0x00000008;
delay(10);
IO0CLR = 0x00000008;
}
void lcd_data(void)
{
temp = temp1 & 0xf0;
temp = temp ;//<< 6;
wr_dn();
temp= temp1 & 0x0f;
temp= temp << 4;
wr_dn();
delay(100);
}
void clr_disp(void)
{
temp1 = 0x01;
lcd_com();
delay(500);
}
void delay(unsigned int r1)
{
for(r=0;r<r1;r++);
}
#include<lpc214x.h>
#include<stdio.h>
//Function prototypes
void lcd_init(void);
void wr_cn(void);
void clr_disp(void);
void delay(unsigned int);
void lcd_com(void);
void wr_dn(void);
void lcd_data(void);
unsigned char temp1;
unsigned long int temp,r=0;
unsigned char *ptr,disp[] = " HI HELLO ",disp1[] = "HOW ARE YOU";
int main()
{
PINSEL0 = 0X00000000;
IO0DIR = 0x000000FC;
lcd_init();
delay(3200);
clr_disp();
delay(3200);
temp1 = 0x81;
lcd_com();
ptr = disp;
while(*ptr!='\0')
{
temp1 = *ptr;
lcd_data();
ptr ++;
}
temp1 = 0xC0;
lcd_com();
ptr = disp1;
while(*ptr!='\0')
{
temp1 = *ptr;
lcd_data();
ptr ++;
}
while(1);
}
void lcd_init(void)
{
temp = 0x30;
wr_cn();
delay(3200);
temp = 0x30;
wr_cn();
delay(3200);
temp = 0x30;
wr_cn();
delay(3200);
temp = 0x20;
wr_cn();
delay(3200);
temp1 = 0x28;
lcd_com();
delay(3200);
temp1 = 0x0C;
lcd_com();
delay(800);
temp1 = 0x06;
lcd_com();
delay(800);
temp1 = 0x80;
lcd_com();
delay(800);
}
void lcd_com(void)
{
temp = temp1 & 0xf0;
wr_cn();
temp = temp1 & 0x0f;
temp = temp << 4;
wr_cn();
delay(500);
}
void wr_cn(void)
{
IO0CLR = 0x000000FC;
IO0SET = temp;
IO0CLR = 0x00000004;
IO0SET = 0x00000008;
delay(10);
IO0CLR = 0x00000008;
}
void wr_dn(void)
{
IO0CLR = 0x000000FC;
IO0SET = temp;
IO0SET = 0x00000004;
IO0SET = 0x00000008;
delay(10);
IO0CLR = 0x00000008;
}
void lcd_data(void)
{
temp = temp1 & 0xf0;
temp = temp ;//<< 6;
wr_dn();
temp= temp1 & 0x0f;
temp= temp << 4;
wr_dn();
delay(100);
}
void clr_disp(void)
{
temp1 = 0x01;
lcd_com();
delay(500);
}
void delay(unsigned int r1)
{
for(r=0;r<r1;r++);
}
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