My GSM modem and AVR usart

[hardeep]

My GSM modem and AVR usart are working fine individually….but when i connect modem to controller,i 

 

#include<avr/io.h>

#include<util/delay.h>

#define F_CPU 11059200UL

#define USART_BAUDRATE 9600 // Baud Rate value

#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) – 1)

 

 

#define LCD_DATA PORTB //LCD data port

 

#define ctrl PORTD

#define en PD2 // enable signal

#define rw PD3 // read/write signal

#define rs PD4 // register select signal

void usart_putstr(char * s); 

void LCD_cmd(unsigned char cmd);

void init_LCD(void);

void LCD_write(unsigned char data);

void usart_init();

static void usart_putch(unsigned char send);

unsigned int usart_getch();

void gotoxy(unsigned char row,unsigned char column);

static void LCD_String(char *s);  

int main()

{

unsigned char value,i;

DDRB=0xff; // LCD_DATA port as output port

PORTB=0x00;

DDRD|=0xFC;

init_LCD(); //initialization of LCD

_delay_ms(50); // delay of 50 milli seconds

usart_init(); // initialization of USART

gotoxy(1,1);

//char a[] = “AT”;

char b[] = “AT+CMGS=”;

char no[]=”+919595955635″;

char body[] = “Successful”;

 

 

{

 

//usart_putstr(a);

//_delay_ms(5);

// usart_putstr(“rn”);

// _delay_ms(100);

usart_putstr(b);

_delay_ms(100);

usart_putch(‘”‘);

// _delay_ms(100);

usart_putstr(no);

// _delay_ms(100);

usart_putch(‘”‘);

_delay_ms(100);

 

usart_putch(‘r’);

usart_putch(‘n’);

_delay_ms(100);

usart_putstr(body);

_delay_ms(100);

usart_putch(0x1A);

 

 

// for (i=0;i<16;i++)

// {

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

// _delay_ms(100);

// LCD_write(value); // write data to LCD

 

// }

// gotoxy(2,1);

   

}

return 0;

}

 

void init_LCD(void)

{

LCD_cmd(0x38); // initialization of 16X2 LCD in 8bit mode

_delay_ms(1);

 

LCD_cmd(0x01); // clear LCD

_delay_ms(1);

 

LCD_cmd(0x0E); // cursor ON

_delay_ms(1);

 

LCD_cmd(0x80); // —8 go to first line and –0 is for 0th position

_delay_ms(1);

return;

}

 

void LCD_cmd(unsigned char cmd)

{

LCD_DATA=cmd;

ctrl &=~ (1<<rs);

ctrl&=~(1<<rw);

ctrl|=(1<<en); // RS and RW as LOW and EN as HIGH

_delay_ms(1);

ctrl &=~ (1<<rs);

ctrl&=~(1<<rw);

ctrl&=~(1<<en); // RS, RW , LOW and EN as LOW

_delay_ms(1);

return;

}

void LCD_write(unsigned char data)

{

LCD_DATA= data;

ctrl |= (1<<rs);

ctrl&=~(1<<rw);

ctrl|=(1<<en); // RW as LOW and RS, EN as HIGH

_delay_ms(1);

ctrl |= (1<<rs);

ctrl&=~(1<<rw);

ctrl&=~(1<<en); // EN and RW as LOW and RS HIGH

_delay_ms(1); // delay to get things executed return ;

}

 

 

void usart_init()

{

    UBRRL = 0x47;

// UBRRL = (unsigned char)BAUD_PRESCALE; 

// Load lower 8-bits of the baud rate value into the low byte of the UBRR register

// UBRRH = (unsigned char)(BAUD_PRESCALE>>; // Load upper 8-bits of the baud rate value..

_delay_ms(1);

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

}

 

unsigned int usart_getch()

{

while (!(UCSRA & (1 << RXC)) ); 

// Do nothing until data has been received and is ready to be read from UDR

_delay_ms(1);

return(UDR); // return the byte

}

 

static 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 

}

 

 

 

 

 void gotoxy(unsigned char row,unsigned char column)

{

switch (row) 

 

  {

    case 1: LCD_cmd (0x80 + column – 1); break;

    case 2: LCD_cmd (0xc0 + column – 1); break;

    default: break;

  }

}

 

 

 

 

 

static void LCD_String(char *s) 

{

   register char c;

 

   while((c = *s++))

   {

      _delay_ms(10);

LCD_write(c);

   }

   

   return;

}

void usart_putstr(char * s) 

{ 

  while(*s) 

  { 

    usart_putch(*s++); 

  } 

}

 

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