SMS through GSM Modem SIM300 and at89c52

[prabin20]

hi guys i m doing a project in which i have to send sms.but i couldnot able to send sms . i also wanted to display the modem responses on lcd. please upload program any who has already done this kind of project.....:-?

#include<at89x52.h>

#define lcd_data_pin P2
sbit BUSY=P2^7;
sbit rs=P1^0;
sbit rw=P1^1;
sbit en=P1^2;
sbit l=P1^3;  

void USART_Send(unsigned char *data2send);
void Delay(unsigned int msec);

void LCD_Init();
void LCD_Cmd(unsigned char comm,unsigned char Mode);
void LCD_Data(unsigned char disp);
void LCD_String(unsigned char *disp);

void Send_SMS(unsigned char *msg);
void Send_SMS2(unsigned char *msg);
void Get_IMEI();
void Make_Call(unsigned char *number);

unsigned char data2rcv[40];
unsigned int idx = 0;
unsigned char a = 0, i = 0, z = 0, j = 0;
unsigned char *num = "+919xxxxxxxxx";
unsigned char *dummy, *data2send = "Hello!";
unsigned char chr;

void main()
{
	P0 = 0x00; //not used
	P1 = 0x00; //Used for Appliances
	P2 = 0x00; //not used
	P3 = 0x03; //used for serial
	
	TMOD = 0x20;	                      
	SCON = 0x50;			       
	TH1 = 0xFD;	
	TR1 = 1;		

  EA = 1;
	ES = 1;
	
	l=0;
	LCD_Init();			   
	Delay(20);

	LCD_Cmd(0x01,0);
	LCD_Cmd(0x84,0);
	LCD_String("WELCOME");
	Delay(50);
	LCD_Cmd(0xC4,0);
	LCD_String(" USER ");
	Delay(90);

	dummy = &data2rcv;
	
	if(l==1) {
				
				//USART_Send("8051");
				Delay(100);
				Send_SMS("Hello! Prabin");
				
	}
}


void serial_ISR (void) interrupt 4
{   
	if(RI==1)
	{
		data2rcv[idx] = SBUF;
		RI = 0;
		LCD_Data(data2rcv[idx]);
	}	
}

void Delay(unsigned int msec)   
{
	int i,j;
	for(i=0;i<msec;i++)
		for(j=0;j<1275;j++);
}

//LCD Functions

void LCD_Cmd(unsigned char comm,unsigned char Mode) 
{
	lcd_data_pin=comm;
	en=1;
	rs=Mode;
	rw=0;
	Delay(1);
	en=0;
}

void LCD_Data(unsigned char disp)   
{
	lcd_data_pin=disp;
	en=1;
	rs=1;
	rw=0;
	Delay(1);
	en=0;
}

void LCD_String(unsigned char *disp)    
{
	unsigned int cnt = 0;
	
	while(*disp)
	{
			LCD_Data(*disp++);
							
	}

}

void LCD_Init()     
{
	LCD_Cmd(0x38,0);   
	Delay(5);
	LCD_Cmd(0x06,0);       
	Delay(5);
	LCD_Cmd(0x0C,0);       
	Delay(5);
	LCD_Cmd(0x02,0);
	Delay(5);
}

//GSM Functions
//Send SMS Function

void Send_SMS(unsigned char *msg)
{
		
	USART_Send("AT\r");
	LCD_Cmd(0x01,0);
	LCD_Cmd(0x80,0);
	LCD_String("AT");
	LCD_Cmd(0xC0,0);
	
	Delay(500);
	LCD_String(dummy);
	USART_Send("AT+CMGF=1\r");
	LCD_Cmd(0x01,0);
	LCD_Cmd(0x80,0);
	LCD_String("AT+CMGF=1");
	LCD_Cmd(0xC0,0);
	
	Delay(500);
	LCD_String(dummy);
	USART_Send("AT+CMGS=\r");
	LCD_Cmd(0x01,0);
	LCD_Cmd(0x80,0);
	LCD_String("AT+CMGS=");
	LCD_Cmd(0xC0,0);
	
	USART_Send(0x22);
	USART_Send("+919531881579");
	LCD_Cmd(0x01,0);
	LCD_Cmd(0x80,0);
	LCD_String("+919531881579");
	LCD_Cmd(0xC0,0);
	USART_Send(0x22);
	Delay(500);
	USART_Send(msg);
	Delay(500);
	USART_Send(0x1A);
	USART_Send("SMS Sent...\r");
	LCD_Cmd(0x01,0);
	LCD_Cmd(0x80,0);
	LCD_String("SMS Sent...");
	LCD_Cmd(0xC0,0);
}

void Send_SMS2(unsigned char *msg)
{
      
  USART_Send("AT+CMGF=1\r");
  Delay(1000);
  USART_Send("AT+CMGS=\"");
  USART_Send(num);
  USART_Send("\"\r");
  Delay(1000);
  USART_Send(msg);
  USART_Send(26);
      
}



//Get IMEI

void Get_IMEI()
{
  USART_Send("AT+GSN\r");      
}

//Call Function

void Make_Call(unsigned char *number)
{
	USART_Send("ATDT ");
	USART_Send(number);
  USART_Send(";\r");   
      

}

//USART Functions
void USART_Send(unsigned char *data2send)
{
	
	while(*data2send)
	{
			SBUF = *data2send++;
			while(TI == 0);
			TI = 0;	
	}	
}

 

[jayanth.devarayanadurga]

LCD_Data is already displaying received data on LCD. The interrupt code is already displaying data on LCD then why did you add LCD_String(dummy) in Send_SMS() function?