sending SMS from a GSM modem

[Jestin Kuriakose]

i am using atmel AT89S52 ,SIM300 gsm modem . i just want to send a sms from the GSM modem without using pc.here is my code-

#include<reg51.h>

void serialcomm()
{

 TMOD=0x20;        // Mode=2
 TH1=0xfd;         // 9600 baud
 SCON=0x50;        // Serial mode=1 ,8-Bit data,1 Stop bit ,1 Start bit  , Receiving on
 TR1=1;           // Start timer
  
}
void delay(unsigned int value)
   {
     unsigned int i,j;
     for(i=0;i<value;i++)      
     for(j=0;j<1275;j++);
   }

void serial(unsigned char x)
{
	SBUF=x;
	while(TI==0);
	TI=0;
}

void Send2Gsm(char *aaa)
{
     while(*aaa!='\0')
		 {
			 serial(*aaa);
			 aaa++;
     }
}




void main()
{

  serialcomm();
  Send2Gsm("AT\r\n");
  delay(2);
  Send2Gsm("AT+CMGF=1\r\n");
  delay(2);
  Send2Gsm("AT+CMGS=8762357075\r\n");  
  delay(2);
  Send2Gsm("Hello");
  serial(0x1a);

  }

when i tried this code,i am not getting SMS from the gsm modem.can anyone point out the mistakes in my code ??

 

[horace1]

have you tried a longer delay between the commands or even waiting for a response from the modem and checking it is OK or some error message?