[SOLVED] Serial communication using USART

[ckshivaram]

please put your final code and circuit here.....

 

[iVenky]

Here's the code

// Program to receive data from USART and displaying it on LCD
/*
Receive data from serial port and display it on LCD
LCD DATA port----PORT A
ctrl port------PORT B
rs-------PB0
rw-------PB1
en-------PB2
using external clock frequency 12MHz
*/

#define F_CPU 12000000UL
#define USART_BAUDRATE 9600 // Baud Rate value
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)

#include<avr/io.h>
#include<util/delay.h>

#define LCD_DATA PORTA //LCD data port

#define ctrl PORTC
#define en PC2 // enable signal
#define rw PC1 // read/write signal
#define rs PC0 // register select signal

void LCD_cmd(unsigned char cmd);
void init_LCD(void);
void LCD_write(unsigned char data);
void LCD_clear();

void usart_init();
void usart_putch(unsigned char send);
unsigned int usart_getch();

int main()
{
unsigned char value;
DDRA=0xff; // LCD_DATA port as output port
DDRC=0x07;
_delay_ms(100); // signal as out put
init_LCD(); //initialization of LCD
_delay_ms(50); // delay of 50 milli seconds
usart_init(); // initialization of USART

LCD_cmd(0xC0); // to go in second line and zeroth position on LCD

while(1)
{
value=usart_getch(); // Call a function to get data from serial port

LCD_write(value); // write data to LCD
}
return 0;




}

void init_LCD(void)
{
LCD_cmd(0x38); // initialization of 16X2 LCD in 8bit mode
_delay_ms(50);

LCD_cmd(0x01); // clear LCD
_delay_ms(50);

LCD_cmd(0x0E); // cursor ON
_delay_ms(50);

LCD_cmd(0x80); // ---8 go to first line and --0 is for 0th position
_delay_ms(50);
return;
}

void LCD_cmd(unsigned char cmd)
{
LCD_DATA=cmd;
ctrl =(0<<rs)|(0<<rw)|(1<<en);
_delay_ms(50);
ctrl =(0<<rs)|(0<<rw)|(0<<en);
_delay_ms(50);
return;
}

void LCD_write(unsigned char data)
{
LCD_DATA= data;
ctrl = (1<<rs)|(0<<rw)|(1<<en);
_delay_ms(1);
ctrl = (1<<rs)|(0<<rw)|(0<<en);
_delay_ms(1);
return ;
}

void usart_init()
{
UCSRB |= (1 << RXEN) | (1 << TXEN); // Turn on the transmission and reception circuitry
UCSRC |= (1 << URSEL) | (1<<USBS) | (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
}

unsigned int usart_getch()
{
while ((UCSRA & (1 << RXC)) == 0);
// Do nothing until data has been received and is ready to be read from UDR
return(UDR); // return the byte
}


Every thing is working perfectly. The cursor goes to the next line and moves right for every character that I type. The only problem is that some kind of symbol is displayed instead of alphabets.

 

[bigdogguru]

Every thing is working perfectly. The cursor goes to the next line and moves right for every character that I type. The only problem is that some kind of symbol is displayed instead of alphabets.

Is this for every character you type or just intermittently?

BigDog

 

[ckshivaram]

why are you bringing other topics into this thread, and moreover you also started a new thread for the same topic... i would delete all the threads posted by you as , there seems to be no point in this thread, its simply going on and on and on, for a simple serial communication, i dont think 50 posts are required....

i would delete all the things related to rfid as you already started this thread seperately....