LCD Scrolling Display Module- (Part 30/46)

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#define F_CPU 8000000
 
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#include <avr/eeprom.h>
#include "usart.h"
 
void switch_init ( void );
 
int main ( void )
{
usart_init ();
switch_init ();
while ( 1 )
{
PORTD &= 0x7F;
_delay_ms ( 2000 );
PORTD |= 0x80;
while ( 0x0F == ( PINC & 0x0F ) );   // wait till any key is pressed
_delay_ms ( 50 );
usart_send_string ( "This is a demonstration of single line LCD scrolling display module interfacing 
by Engineers Garage !!!n" );
_delay_ms ( 500 );
}
}
 
void switch_init ( void )
{
cli();
DDRC &= 0xE0;
PORTC = 0xFF;
DDRD |= 0x80;
PORTD |= 0x80;
}
 
#define _USART_H #ifndef F_CPU #define F_CPU 8000000 #endif #define USART_BAUDRATE 9600 #define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1) #include<avr/io.h> #include<util/delay.h> #include <stdio.h> void usart_init(); void usart_putch(unsigned char send); unsigned int usart_getch(); void usart_send_string(const char* data); int uart_print(char c, FILE *stream); FILE uart_out = FDEV_SETUP_STREAM(uart_print, NULL, _FDEV_SETUP_WRITE); int uart_print(char c, FILE *stream) { if (c == 'n') uart_print('r', stream); loop_until_bit_is_set(UCSRA, UDRE); UDR = c; return 0; } void usart_init () { UCSRB |= (1<<RXCIE) | (1 << RXEN) | (1 << TXEN); // Turn on the transmission reception .. // circuitry and receiver interrupt UCSRC |= (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1); // Use 8-bit character sizes UBRRL = BAUD_PRESCALE; // Load lower 8-bits of the baud rate value.. // into the low byte of the UBRR register UBRRH = (BAUD_PRESCALE >> 8); // Load upper 8-bits of the baud rate value.. // into the high byte of the UBRR register stdout = &uart_out; } void usart_putch(unsigned char send) { while ((UCSRA & (1 << UDRE)) == 0); // Do nothing until UDR is ready.. // for more data to be written to it UDR = send; // Send the byte } unsigned int usart_getch() { while ((UCSRA & (1 << RXC)) == 0); // Do nothing until data have been received and is ready to be read from UDR return(UDR); // return the byte } void usart_send_string(const char* data) { for(; *data; data ++) usart_putch(*data); } #endif 

 
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#ifndef _LCD_H #define _LCD_H  #ifndef F_CPU #define F_CPU 8000000 #endif  #include<avr/io.h> #include<util/delay.h> #include<inttypes.h> #include <stdio.h> #include <string.h>  #define rs PA0 #define rw PA1 #define en PA2   void lcd_init(); void dis_cmd(char); void dis_data(char); void lcdcmd(char); void lcddata(char); void lcd_clear(void); void lcd_2nd_line(void); void lcd_1st_line(void); void lcd_string(const char *data); int lcd_print(char c, FILE *stream); int lcd_scroll(const char *data);  FILE lcd_out = FDEV_SETUP_STREAM(lcd_print, NULL,                                          _FDEV_SETUP_WRITE);  char disp_beg [] = "                ";  int lcd_print(char c, FILE *stream) {   if('n' == c)   	lcd_2nd_line();   else     dis_data(c);    return 0; } #define F_CPU 8000000  #include <avr/io.h> #include <util/delay.h> #include <stdio.h> #include <avr/interrupt.h> #include "lcd.h" #include "usart.h"  char A [ 150 ]; char B [ 150 ];  int main ( void ) { 	int i;  	usart_init ();  	cli();  	lcd_init ();  	printf ( "    ENGINEERS   "); 	printf ( "n     GARAGE     ");  	for ( i = 0; 'n' != ( A [ i ] = usart_getch () ); i ++ ); 	A [ i ] = ''; 	 	while ( 1 ) 	{ 		for ( i = 0; i < 150; i ++ ) 			B [ i ] = A [ i ]; 		lcd_scroll ( B ); 	} }  
#ifndef _USART_H
#define _USART_H
 
#ifndef F_CPU
#define F_CPU 8000000
#endif
 
#define USART_BAUDRATE 9600
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)
 
#include<avr/io.h>
#include<util/delay.h>
#include <stdio.h>
 
void usart_init();
void usart_putch(unsigned char send);
unsigned int usart_getch();
void usart_send_string(const char* data);
int uart_print(char c, FILE *stream);
 
FILE uart_out = FDEV_SETUP_STREAM(uart_print, NULL,
                                         _FDEV_SETUP_WRITE);
 
int uart_print(char c, FILE *stream)
{
 
  if (c == 'n')
    uart_print('r', stream);
  loop_until_bit_is_set(UCSRA, UDRE);
  UDR = c;
  return 0;
}
 
void usart_init ()
{
UCSRB |= (1<<RXCIE) | (1 << RXEN) | (1 << TXEN);   // Turn on the transmission reception ..
// circuitry and receiver interrupt
UCSRC |= (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1); // Use 8-bit character sizes
 
UBRRL = BAUD_PRESCALE; // Load lower 8-bits of the baud rate value..
// into the low byte of the UBRR register
UBRRH = (BAUD_PRESCALE >> 8); // Load upper 8-bits of the baud rate value..
// into the high byte of the UBRR register
stdout = &uart_out;
}
 
void usart_putch(unsigned char send)
{
while ((UCSRA & (1 << UDRE)) == 0); // Do nothing until UDR is ready..
// for more data to be written to it
UDR = send; // Send the byte 
}
 
unsigned int usart_getch()
{
while ((UCSRA & (1 << RXC)) == 0);
// Do nothing until data have been received and is ready to be read from UDR
return(UDR); // return the byte
}
 
void usart_send_string(const char* data)
{
for(; *data; data ++)
usart_putch(*data);
}
 
#endif
 
 
 

 

 

 
 
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• ATmega16
• LCD
• LED
• Resistor