send and receive sms using sim900A interface ATmega128A

Hello Friend,

I am working send and receive sms using SIM900A and Atmega128A. I am able to send sms using program but i am not receive sms and display on LCD.
I am using WINAVR and peterfleury Lib. Please Help.

//************************************************************************//
//********************* Recive SMS Using SIM900A Module **********************//
//***************************************************************************//
#include <avr/io.h>
#include <avr/interrupt.h>
#include <stdlib.h>
#include "uart.h" // peterfleury Lib
#include "lcd.h" // peterfleury Lib
#include <util/delay.h>

#define UART_BAUD_RATE 9600 /* 9600 baud */
#define xtalCpu 7372800L

int i;
char x;
int k,i;
char data[256];
char j;
char msg[15];
char store[]="Hi anil";
char ch;

int main(void)
{
lcd_init(LCD_DISP_ON); // Initialize LCD
uart_init( UART_BAUD_SELECT(UART_BAUD_RATE,F_CPU) );
sei();
//DDRA = 0xFF;
//PORTD=0x00;
while(1)
{
for(i=0;i<=50;i++)
{
_delay_ms(200);
if(i==50)
{
uart_puts("AT\r\n");
_delay_ms(2000);
uart_puts("AT+CMGF=1\r\n");//Message format “AT+CMGF=[mode]1”
_delay_ms(2000);
uart_puts(" AT+CMGR=1\r"); //Reads the first SMS
_delay_ms(20);
uart_puts("AT+CNMI=1,2,0,0,0\r\n");
//_delay_ms(20);

while((ch=uart_getc( )) !='\n')
{
msg[i++]=ch;
msg='\0';
//i=0;
}

//while(msg!='\0')
//{
// putc(msg[i++]);
//}

if(store!=msg[8])
{

lcd_puts("NO");
_delay_ms(200);
}
if(store==msg[8])
{

lcd_puts("yes");
_delay_ms(200);
}

//lcd_clrscr();
//uart_puts("AT+CMGDA=\"DEL ALL\"\r\n");
//_delay_ms(2000);
}
}


}
}

use reading message using at+cmgr=1; and then give delay of 2000ms recieve message using interrupt and after that delete message using at+cmgda="dell all" coomand.

zia said:

use reading message using at+cmgr=1; and then give delay of 2000ms recieve message using interrupt and after that delete message using at+cmgda="dell all" coomand.

Click to expand...

Please give some link to use interrupt.

ther are lot off tutorial out of them one is
https://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=48188