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GPRS coding using LPC2148

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pappu_sam

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Hi all,

Iam using SIM300 gsm module to connect GPRS,
I got GPRS connectivity from hyperterminal using AT Commands,

Iam trying write code to interface those AT commands of GPRS using LPC2148 microcontroller

Code: 
int main(void)
{

	PINSEL0 = 0x00050005;
	
	lcd_init();
	lcd_write_control(0x01);	
	goto_cursor(0x00);
	lcd_print("  GSM-GPRS-GPS  ");
	goto_cursor(0x40);
	lcd_print("  SYSTEM");
	delay(100);
	lcd_write_control(0x01);
	Init_UART1();
	Init_UART0();
	
	
	//gsm_init();
	GSM_GPRS_INIT();
	
//	while(1)
//	{
//		gsm_fun();
//	}
}	
////////////////////
unsigned char * append(unsigned char* s, char c)
{
        int len = strlen(s);
        s[len] = c;
        s[len+1] = '\0';
		
		return s;
}
////////////////////////
void GSM_GPRS_INIT()
{
	unsigned char check;
	unsigned char *AppendedString,*AppendedString2,*AppendedString3;
	unsigned char ch;
	unsigned  char x=0;
	unsigned char str0[50];

	lcd_write_control(0x01);		   
	goto_cursor(0x00);
	lcd_print("GSM Initializing");
	delay(100000000);
	delay(100000000);

	UART0_SendStr("Initializing");
//	while(!(U1LSR&0X01));
//	ch=U1RBR;
//	UART0_SendByte(ch);
//	while(ch!='y' || ch!='Y')
//	{
//		str0[x++]=ch;
//		while(!(U1LSR&0X01));
//		ch=U1RBR;
//		UART0_SendByte(ch);
//	}
	lcd_write_control(0x01);		   
	goto_cursor(0x00);
	lcd_print("call ready");
	delay(1000000);

	do
	{
		check=SendATCommand(GPRS[0]);	  //AT  <<OK
	}while(check==0);
	lcd_write_control(0x01);		   
	goto_cursor(0x00);
	lcd_print("AT+OK");
	delay(1000000);
	
	do{
		check = SendCGDCONTCommand();		 //AT+CGDCONT=1,"IP","airtelgprs.com"   <<OK
	}while(check==0);
	lcd_write_control(0x01);		   
	goto_cursor(0x00);
	lcd_print("at+cgdcont=..+OK");
	delay(1000000);
	
	do
	{
		check=SendCSTTCommand();       // <<OK
	}while(check==0);
	lcd_write_control(0x01);		   
	goto_cursor(0x00);
	lcd_print("AT+CSTT=1+OK");
	delay(1000000);
	
//	//at+ciicr
	do
	{
		check=SendCIICRCommand();			   //delay <<OK
	}while(check==0);
	lcd_write_control(0x01);		   
	goto_cursor(0x00);
	lcd_print("AT+CIICR");
	delay(1000000);
//	
//	//at+cifsr
//	do
//	{
//		check=SendCommandCIFSR(GPRS[7]);	   //some IP address like 106.112.23.4
//	}while(check==0);
//	lcd_write_control(0x01);		   
//	goto_cursor(0x00);
//	lcd_print("AT+CIFSR");
//	delay(10000);
//	
//	//at+cdnsorip=0
//	do
//	{
//		check=SendCommand(GPRS[9]);			   // <<OK
//	}while(check==0);
//	lcd_write_control(0x01);		   
//	goto_cursor(0x00);
//	lcd_print("AT+CDNSORIP=0");
//	delay(10000);
//
//	//at+cipstart="TCP","61.12.108.35","8080"
//   	AppendedString3 = append(GPRS[10],'"');
//	strcat(AppendedString3,GPRS[11]);
//	AppendedString3 = append(AppendedString3 ,'"');
//	AppendedString3 = append(AppendedString3,',');
//	AppendedString3 = append(AppendedString3 ,'"');
//	strcat(AppendedString3,GPRS[12]);
//	AppendedString3 = append(AppendedString3 ,'"');
//	AppendedString3 = append(AppendedString3 ,',');
//	AppendedString3 = append(AppendedString3 ,'"');
//	strcat(AppendedString3 ,GPRS[13]);
//	AppendedString3 = append(AppendedString3 ,'"');
//	//GPRS[10]+'"'+GPRS[11]+'"'+','+'"'+GPRS[12]+'"'+','+'"'+GPRS[13]+'"'
//	do
//	{																			 
//		check=SendCommandCIPSTART(AppendedString3);		 //<< OK   CONNECT OK
//	}while(check==0);
//	lcd_write_control(0x01);		   
//	goto_cursor(0x00);
//	lcd_print("AT+CIPSTART");
//	delay(10000);
//
//	//at+cipsend=50
//	do
//	{
//		check=SendCommandCIPSEND(GPRS[14]);
//	}while(check==0);							   // prompt > and pass the strings end with Ctrl+Z
//	lcd_write_control(0x01);		   
//	goto_cursor(0x00);
//	lcd_print("AT+CIPSEND");
//	delay(10000);
//
//
//	SEND_UART1("YoYo");
	
}


//////////////////////////
//unsigned char SendCIICRCommand - > at+ciicr   delay    <<OK
//////////////////////////////////
unsigned char SendCIICRCommand()
{
	unsigned char ch;
	unsigned  char x=0;
	unsigned char str0[50];
	unsigned char str1[50];
	delay(200);
	UART0_SendStr("CIICR");
	//UART1_SendStr("AT+CIICR");
	delay(200);
	SEND_CHAR('A');
	SEND_CHAR('T');
	SEND_CHAR('+');
	SEND_CHAR('C');
	SEND_CHAR('I');
	SEND_CHAR('I');
	SEND_CHAR('C');
	SEND_CHAR('R');
	//delay(100);
	delay(100);
	delay(400);
	//delay(500000000);
	
//	delay(100);
//	delay(400);
//	delay(100);
//	delay(400);
// 	x=0;
//	while(!(U1LSR&0X01));
//		ch=U1RBR;
	do{
		//UART0_SendStr("Before Waiting");
		while(!(U1LSR&0X01));
		ch=U1LSR;
		str1[x++]=ch;
		UART0_SendByte(ch);
		//UART0_SendStr(str1);
		//UART0_SendStr("After Waiting");
	}while((ch!='R'));
	
	UART0_SendStr(str1);

	delay(400);
	SEND_CHAR('\r');
	SEND_CHAR('\n');
//	SEND_CHAR(0X0D);
//	SEND_CHAR(0X0A);
	delay(400);


 	x=0;
	do{
		while(!(U1LSR&0X01));
		ch=U1RBR;
		str1[x++]=ch;
		//UART0_SendByte('-');
	
	}while(ch!='K');
	UART0_SendStr(str1);
	if((ch!='K'))
	{
		return(0);
	}
	return(1);
}


//////////////////////////
//unsigned char SendCSTTCommand - > at+cstt="airtelgprs.com","",""   <<OK
//////////////////////////////////
unsigned char SendCSTTCommand()
{
	unsigned char ch;
	unsigned  char x=0;
	unsigned char str0[50];
	unsigned char str1[50];
	delay(200);
	//UART0_SendStr(p);
	//UART1_SendStr(p);
	SEND_CHAR('A');
	SEND_CHAR('T');
	SEND_CHAR('+');
	SEND_CHAR('C');
	SEND_CHAR('S');
	SEND_CHAR('T');
	SEND_CHAR('T');
	SEND_CHAR('=');
	SEND_CHAR('"');
	SEND_CHAR('a');
	SEND_CHAR('i');
	SEND_CHAR('r');
	SEND_CHAR('t');
	SEND_CHAR('e');
	SEND_CHAR('l');
	SEND_CHAR('g');
	SEND_CHAR('p');
	SEND_CHAR('r');
	SEND_CHAR('s');
	SEND_CHAR('.');
	SEND_CHAR('c');
	SEND_CHAR('o');
	SEND_CHAR('m');
	SEND_CHAR('"');
	SEND_CHAR(',');
	SEND_CHAR('"');
	SEND_CHAR('"');
	SEND_CHAR(',');
	SEND_CHAR('"');
	SEND_CHAR('"');
	SEND_CHAR('\r');
	SEND_CHAR('\n');
	//SEND_CHAR(0X0D);
	//SEND_CHAR(0X0A);
	delay(100);
	delay(400);

 	x=0;
	
	do{
		while(!(U1LSR&0X01));
		ch=U1RBR;
		str1[x++]=ch;
	}while((ch!='K'));
	
	UART0_SendStr(str1);

	if((ch!='K'))
	{
		return(0);
	}
	return(1);
}


//////////////////////////
//unsigned char SendCGDCONTCommand - > AT+CGDCONT=1,"IP","airtelgprs.com"   <<OK
//////////////////////////////////
unsigned char SendCGDCONTCommand()
{
	unsigned char ch;
	unsigned  char x=0;
	unsigned char str0[50];
	unsigned char str1[50];
	delay(200);
	//UART0_SendStr(p);
	//UART1_SendStr(p);
	SEND_CHAR('A');
	SEND_CHAR('T');
	SEND_CHAR('+');
	SEND_CHAR('C');
	SEND_CHAR('G');
	SEND_CHAR('D');
	SEND_CHAR('C');
	SEND_CHAR('O');
	SEND_CHAR('N');
	SEND_CHAR('T');
	SEND_CHAR('=');
	SEND_CHAR('1');
	SEND_CHAR(',');
	SEND_CHAR('"');
	SEND_CHAR('I');
	SEND_CHAR('P');
	SEND_CHAR('"');
	SEND_CHAR(',');
	SEND_CHAR('"');
	SEND_CHAR('a');
	SEND_CHAR('i');
	SEND_CHAR('r');
	SEND_CHAR('t');
	SEND_CHAR('e');
	SEND_CHAR('l');
	SEND_CHAR('g');
	SEND_CHAR('p');
	SEND_CHAR('r');
	SEND_CHAR('s');
	SEND_CHAR('.');
	SEND_CHAR('c');
	SEND_CHAR('o');
	SEND_CHAR('m');
	SEND_CHAR('"');
	SEND_CHAR(0X0D);
	SEND_CHAR(0X0A);
	delay(100);
	delay(400);

 	x=0;
	
	do{
		while(!(U1LSR&0X01));
		ch=U1RBR;
		str1[x++]=ch;
	}while((ch!='K'));
	
	UART0_SendStr(str1);

	if((ch!='K'))
	{
		return(0);
	}
	return(1);
}

//////////////////////////
//unsigned char SendCGATTCommand
//////////////////////////////////
unsigned char SendCGATTCommand(unsigned char *p)
{
	unsigned char ch;
	unsigned  char x=0;
	unsigned char str0[50];
	unsigned char str1[50];
	delay(200);
	UART0_SendStr(p);
	SEND_CHAR('A');
	SEND_CHAR('T');
	SEND_CHAR('+');
	SEND_CHAR('C');
	SEND_CHAR('G');
	SEND_CHAR('A');
	SEND_CHAR('T');
	SEND_CHAR('T');
	SEND_CHAR('=');
	SEND_CHAR('1');
	delay(100);

	do{
		while(!(U1LSR&0X01));
		ch=U1RBR;
		str0[x++]=ch;
		//UART0_SendByte(ch);
		
	}while(ch!='1');
	UART0_SendStr(str0);

	//delay(400);
	//delay(400);
	SEND_CHAR(0X0D);
	SEND_CHAR(0X0A);
	delay(400);
	delay(400);
	delay(400);	
 	x=0;
	
	do{
		while(!(U1LSR&0X01));
		ch=U1RBR;
		str1[x++]=ch;
		UART0_SendByte(ch);
		//UART0_SendStr(str1);
	
	}while((ch!='K') || (ch!='R'));
	
	UART0_SendStr(str1);

	if((ch!='K') || (ch!='R'))
	{
		return(0);
	}
	return(1);
}

//////////////////////////
//unsigned char SendATCommand
//////////////////////////////////
unsigned char SendATCommand(unsigned char *p)
{
	unsigned char ch;
	unsigned  char x=0;
	unsigned char str0[50];
	unsigned char str1[50];
	delay(200);
	UART0_SendStr(p);
	UART1_SendStr(p);
	delay(100);

	do{
		while(!(U1LSR&0X01));
		ch=U1RBR;
		str0[x++]=ch;
		
	}while(ch!='T');
	UART0_SendStr(str0);

	delay(400);
	SEND_CHAR('\r');
	SEND_CHAR('\n');
	//SEND_CHAR(0X0D);
	//SEND_CHAR(0X0A);
	delay(400);


 	x=0;
	do{
		while(!(U1LSR&0X01));
		ch=U1RBR;
		str1[x++]=ch;
		//UART0_SendByte('-');
	
	}while(ch!='K');
	UART0_SendStr(str1);

	if(ch!='K')
	{
		return(0);
	}
	return(1);
}

am able to receive OK upto AT+CSTT, but when I send AT+CIICR after that am not able to get response

please help me regarding this....
 
Last edited:

Hi Ganesh,

I just googled everything and wrote a code and solved the above problem now.
 

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