#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wiringPi.h>
#define LCD_D4 2
#define LCD_D5 3
#define LCD_D6 1
#define LCD_D7 4
#define LCD_RS 7
#define LCD_EN 0
void write4bits(unsigned char command)
{
digitalWrite(LCD_D4, (command & 1));
command >>=1;
digitalWrite(LCD_D5, (command & 1));
command >>=1;
digitalWrite(LCD_D6, (command & 1));
command >>=1;
digitalWrite(LCD_D7, (command & 1));
digitalWrite(LCD_EN, 1);
delayMicroseconds(10);
digitalWrite(LCD_EN, 0);
delayMicroseconds(10);
}
void sendDataCmd4(unsigned char data)
{
write4bits( ((data>>4)&0x0f) );
write4bits( (data&0x0f) );
delayMicroseconds(100);
}
void putCmd4(unsigned char cmd)
{
digitalWrite(LCD_RS, 0);
sendDataCmd4(cmd);
delayMicroseconds(100);
}
void putChar(char c){
digitalWrite(LCD_RS, 1);
sendDataCmd4(c);
}
void initialize_textlcd(){
pinMode(LCD_RS, OUTPUT);
pinMode(LCD_EN, OUTPUT);
pinMode(LCD_D4, OUTPUT);
pinMode(LCD_D5, OUTPUT);
pinMode(LCD_D6, OUTPUT);
pinMode(LCD_D7, OUTPUT);
digitalWrite(LCD_RS, 0);
digitalWrite(LCD_EN, 0);
digitalWrite(LCD_D4, 0);
digitalWrite(LCD_D5, 0);
digitalWrite(LCD_D6, 0);
digitalWrite(LCD_D7, 0);
delay(35);
putCmd4(0x28);
putCmd4(0x28);
putCmd4(0x28);
putCmd4 (0x0e);
putCmd4 (0x02);
delay(2);
putCmd4 (0x01);
delay(2);
}
int main(int argc, char **argv){
int i;
char buf1[100] = "Welcome to";
char buf2[100] = "Embedded World";
int len1=strlen(buf1);
int len2=strlen(buf2);
if(argc == 2) {
len1 = strlen(argv[1]);
len2 = 0;
strcpy(buf1,argv[1]);
}else if(argc >= 3) {
len1 = strlen(argv[1]);
len2 = strlen(argv[2]);
strcpy(buf1,argv[1]);
strcpy(buf2,argv[2]);
}
wiringPiSetup();
initialize_textlcd();
for(i=0;i<len1;i++) putChar(buf1[i]);
putCmd4(0xC0);
for(i=0;i<len2;i++) putChar(buf2[i]);
}
