SIM300 interfacing with AT89S52 problem urgent help

[indrananu]

I have written the following code for a SIM300 interfaced with AT8952 but I'm unable to get the sms to my mobile what might be my error in the program. I don't want any reply from the sim300 like 'OK' so waht changes do I need to do?
I,m using keil ang proteus.

void delay(void)

{
unsigned int a;
for(a=0;a<25000;a++);
}


// Serial Communication

void initialize();
void sendsms1();
void sendsms2();
unsigned char command_AT[] = "AT\r";
unsigned char command_CMGF[] = "AT+CMGF=1\r";
unsigned char command_CMGS[] = "AT+CMGS=+918270895828\r";
unsigned char message1[] = "INTRUDER ALERT AT FACILITY";
unsigned char message2[] = "DOOR UNLOCKED AT FACILITY";
unsigned char CTRLZ = 0x1A;


void initialize()
{
SCON = 0x50; /*SCON: mode 1, 8-bit UART, enable receive */
TMOD = 0x20; /*TMOD: timer 1, mode 2, 8-bit */
TH1 = 0xFD; /*TH1: for 9600 baud */
TR1 = 1; /*TR1: timer 1 run */
TL1 = 0xFD;
TI = 1;
}

void sendsms1()
{
delay();
puts(command_CMGS);
delay();
puts(message1);
delay();
while(!TI);TI=0;SBUF=0x1A;
}

void sendsms2()
{
delay();
puts(command_CMGS);
delay();
puts(message1);
delay();
while(!TI);TI=0;SBUF=0x1A;
}


// Motor function to run it
sbit L293D_A = P2^0; //Positive of motor
sbit L293D_B = P2^1; //Negative of motor
sbit L293D_E = P2^2; //Enable of L293D
int i; // Counter for delay

void motor(void)
{
// Run forward
L293D_A = 1; //Make positive of motor 1
L293D_B = 0; //Make negative of motor 0
L293D_E = 1; //Enable L293D

// Delay for 3.5 sec
for(i=0;i<14;i++)
delayms(250);

// Stop
L293D_A = 0; //Make positive of motor 0
L293D_B = 0; //Make negative of motor 0
L293D_E = 0; //Disable L293D

// Delay for 2 sec
for(i=0;i<8;i++)
delayms(250);

// Run reverse
L293D_A = 0; //Make positive of motor 0
L293D_B = 1; //Make negative of motor 1
L293D_E = 1; //Enable L293D

// Delay for 3.5 sec
for(i=0;i<14;i++)
delayms(250);

// Stop
L293D_A = 0; //Make positive of motor 0
L293D_B = 0; //Make negative of motor 0
L293D_E = 0; //Disable L293D
}

// main function with gsm code and motor control function & LCD message

sbit LCKPIN = P0^0; // Lock pin
sbit IRSNS = P0^1; // IR sensor
sbit ALARM = P1^6; // Alarm pin
sbit MOTORSWT = P2^3; // Motor switch
int ulk;
unsigned char str[5];
void main()
{
ulk = 0; // First time Unlock check
ALARM = 0; // inicially alarm is off
initialize(); // UART initialise
lcd_init(); // LCD initialise
lcd_cmd(LCD_CLS);
lcd_str("WELCOME");
delay();
puts(command_AT);
delay();
puts(command_CMGF);
//Deay 2 sec
for(i=0;i<8;i++)
delayms(250);
lcd_cmd(LCD_CLS);
lcd_str("Security System");
lcd_cmd(0xC0);
lcd_str(" Active");
while(1)
{
if(LCKPIN == 1 && ulk == 1)
{
lcd_cmd(LCD_CLS);
lcd_str("Security System");
lcd_cmd(0xC0);
lcd_str(" Active");
}

if( LCKPIN == 1 ) // Locked Status LCKPIN = 1
{
ulk = 0;
if( IRSNS == 1 )
{
sendsms1();
lcd_cmd(LCD_CLS);
lcd_str(" Intruder Alert");
lcd_cmd(0xC0);
lcd_str(" Message Sent");

// Delay for 2 sec
for(i=0;i<8;i++)
delayms(250);

lcd_cmd(LCD_CLS);
lcd_str(" ALARM ON");
lcd_cmd(0xC0);
lcd_str(" INTRUDER ALERT");

while(LCKPIN != 0)
{
ALARM = 1;
}
}
}
else
{
if( ulk == 0 )
{
sendsms2();
lcd_cmd(LCD_CLS);
lcd_str("Door Unlocked");
lcd_cmd(0xC0);
lcd_str("Message Sent");
ulk = 1;

// Delay for 3 sec
for(i=0;i<12;i++)
delayms(250);

lcd_cmd(LCD_CLS);
lcd_str("Security System");
lcd_cmd(0xC0);
lcd_str(" Deactive");
}
if(MOTORSWT == 0)
motor();
}
}
}

 

[djc]

i think there is a command to turn off the reply given by gsm. Plz chk the datasheet. Something ATE0.

 

[indrananu]

do i give the command after at or before it

 

[djc]

I haven't tried it yet. Try it both ways.If working tell me too.