iam doing a project on sms sending through gsm
using SIM 900 module and 8051
My code is:

#include<reg51.h>
unsigned char *command = "AT";
unsigned char *echo = "ATE0";
unsigned char *msgConfig = "AT+CMGF=1";
unsigned char *number = "AT+CMGS=\"8283******\"";
unsigned char *message = "hello";
unsigned char *CTRLZ = 0x1A;
void serial_init(void);
void serial(unsigned char);
void puts(unsigned char *p );
void delay(void);

void main()
{
serial_init();
puts(command);
delay(); // delay of approx 1 sec
puts(echo);
delay();
puts(msgConfig);
delay();
puts(number);
delay();
puts(message);
delay();
puts(CTRLZ);
while(1);

}
void serial_init(void)
{

TMOD=0x20; //timer 1, mode 2(8-bit autoreload) to set baud rate
TH1=0xFD; //-3 to TH1 for 9600 baud rate
SCON=0x50; // 8 bit txion, 1 start 1 stop bit, REN enable for both txfr and rxve
TR1=1; // start timer
}

void puts(char *p)
{
char *temp = p; /*temp pointer so that the actual pointer is not displaced */
while(*temp != 0x00)
{
serial(*temp);
temp++;
}
}

void serial(unsigned char x)
{

SBUF=x;
while(TI==0);
TI=0;

}
void delay(void) // delay for approx 1 sec
{
int i;
TMOD=0x01; // timer 0 in mode 1
for(i=0;i<142;i++)
{
TL0=0x00; // starting value from 0
TH0=0x00;
TR0=1; // sart timer
while(TF0==0); // polling TF flag for high
TR0=0; // stop timer
TF0=0; // clear flag TF0
//}
}
}

the problem here is SMS won't send by the GSM

when i use the calling function by replacing the AT commands then calling works
but SMS won't.. i think iam wrong in sending AT commands for SMS... please correct me

 

i was expecting a lot..