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Problem receiving SMS from GSM using LPC2148[HELP]

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T

Twisted_transistor

New Member
Hi, I've connected my SIM300 to LPC2148 via RX, TX & GND lines and successfully transmitted SMSs. Now I've written a code to do the following:
-Initialise the GSM module and wait for an SMS to arrive at the SIM
-Wen an SMS is received, the LPC2148 receives an indication in the form of a +CMTI string
-We extract the location of the SMS on the SIM and read the SMS
-This same SMS is den sent to another number indicated by ########## in the code

But on burning the code it was found that blank messages are being sent to the number ########## instead of the actual received SMS.

Can someone please tell me whats wrong in my code:

Code: 
#include<lpc214x.h>
extern unsigned char cmgf[]="AT+CMGF=1";	                        //Text format in GSM modem
extern unsigned char cmgsh[]="AT+CMGS=\"+############\"";          	//Mobile number to which the msg is sent

unsigned char cmgr[]="AT+CMGR=";
unsigned char newmsg=0x00;
unsigned char msgid;

void txu1(unsigned char data)				  //Transmit a byte of data through UART1
{
while(!(U1LSR & 0x20));
  U1THR=data;
 }

unsigned char rxu1()
{
unsigned char p;
while ((U1LSR&0x01)!=1);
p=U1RBR;
return p;
}

void sendstring(unsigned char *p)			//Sends a string of data through UART1
{
while(1)
{
if(*p=='\0') break;
txu1(*p++);
}
}
void delay()							  //delay function
{
int i,j;
for(i=0;i<60000;i++)
for(j=0;j<200;j++);
}


void readmsg()
{
int i;
unsigned char p[21];
sendstring(cmgr);
txu1(msgid);
txu1(0x0D);
txu1(0x0A);
for(i=0;i<6;i++)
p[i]=rxu1();
p[6]='\0';

IO1SET=0x00070000;
sendstring(cmgf);
txu1(0x0D);										// equivalent of 
txu1(0x0A);										//	 enter key
delay();
sendstring(cmgsh);
txu1(0x0D);
txu1(0x0A);	
delay();
sendstring(p);
txu1(0x1A);
delay();
txu1(0x1A);
IO1CLR=0x00070000;
} 



void uart1_irq() __irq
{					  //ISR if anything is recieved in UART1
unsigned char p[12];
unsigned char q;
int i;
q=U1RBR;
if(q=='+')
{
for(i=0;i<11;i++)
{
p[i]=U1RBR;
}
msgid=p[10];
p[11]='\0';

IO1SET=0x00020000;
newmsg=0x01;
}

VICVectAddr=0;
}

void init()					//Initialization of UART0,UART1 and ISR
{
U1LCR=0x83;
U1DLL=0x62;
U1DLM=0x00;
U1LCR=0x03;
U1IER=0x01;
U1FCR=0X07;
VICIntSelect&=0xffffff7f;
VICVectAddr2=(unsigned int)uart1_irq;
VICIntEnable|=0x00000080;
VICVectCntl2=0x20|7; 
}


int main()
{ 
VICIntEnClr=0x00000080;
PINSEL0=0x00050005;
PINSEL1=0x00000000;
PINSEL2=0x00000000;
init();

IO1DIR=0xFFFF0000;

sendstring("ATe0\r\n");
delay();

sendstring("AT+CNMI=3,1,0,0,0\r\n");
delay();

IO1SET=0x00010000;
U1IER=0x01;
while(newmsg==0x00);
newmsg=0x00;
readmsg();
}


Any help will be greatly appreciated.

Muito obrigada:)
 
Ok from what i can see.. the UART IRQ is reading 12bytes of data only.. also loops in the IRQ isnt cool i think...

can you set a breakpoint at "delay();"
about here:

delay();//DEBUG HERE
sendstring(p);

and see whats in "p"
 
Yup.. k.. I've modified the code..
Now, the programmed number ########## receives p correctly. i.e it receives the string:- CMTI: "SM",2
Where "2" is the location in the SIM memory where the received SMS is stored. But the problem now is that I still cannot read the received SMS.

The corrected code is as follows:

Code: 
#include<lpc214x.h>
extern unsigned char cmgf[]="AT+CMGF=1";	                        //Text format in GSM modem
extern unsigned char cmgsh[]="AT+CMGS=\"+############\"";          	//Mobile number to which the msg is sent

unsigned char cmgr[]="AT+CMGR=";
unsigned char newmsg=0x00;
unsigned char msgid;

void txu1(unsigned char data)				  //Transmit a byte of data through UART1
{
while(!(U1LSR & 0x20));
  U1THR=data;
  
}

unsigned char rxu1()
{
unsigned char p;
while ((U1LSR&0x01)!=1);
p=U1RBR;
return p;
}

void sendstring(unsigned char *p)			 //Sends a string of data through UART1
{
while(1)
{
if(*p=='\0') break;
txu1(*p++);
}
}


void delay()							  //delay function
{
int i,j;
for(i=0;i<60000;i++)
for(j=0;j<200;j++);
}


void readmsg()
{
int i;
unsigned char p[60];
unsigned char q[7];
sendstring(cmgf);
txu1(0x0D);										// equivalent of 
txu1(0x0A);										//	 enter key
delay();
sendstring(cmgr);
txu1(msgid);
txu1(0x0D);
txu1(0x0A);
for(i=0;i<58;i++)
p[i]=U1RBR;

for(i=0;i<6;i++)
q[i]=U1RBR;
q[6]='\0';

IO1SET=0x00070000;
sendstring(cmgf);
txu1(0x0D);										// equivalent of 
txu1(0x0A);										//	 enter key
delay();
sendstring(cmgsh);
txu1(0x0D);
txu1(0x0A);	
delay();
sendstring(q);
txu1(0x1A);
delay();
txu1(0x1A);
IO1CLR=0x00070000;
} 



void uart1_irq() __irq
{					  //ISR if anything is recieved in UART1
unsigned char p[13];
unsigned char q;
int i;

q=U1RBR;
if(q=='+')
{
for(i=0;i<12;i++)
{
p[i]=rxu1();
}
msgid=p[11];
p[12]='\0';

sendstring(cmgf);
txu1(0x0D);										// equivalent of 
txu1(0x0A);										//	 enter key
delay();
sendstring(cmgsh);
txu1(0x0D);
txu1(0x0A);	
delay();
sendstring(p);
txu1(0x1A);
delay();
txu1(0x1A);

IO1SET=0x00020000;
newmsg=0x01;
}
VICVectAddr=0;
}

void init()								 //Initialization of UART0,UART1 and ISR
{
U1LCR=0x83;
U1DLL=0x62;
U1DLM=0x00;
U1LCR=0x03;
U1IER=0x01;
U1FCR=0X07;
VICIntSelect&=0xffffff7f;
VICVectAddr2=(unsigned int)uart1_irq;
VICIntEnable|=0x00000080;
VICVectCntl2=0x20|7; 
}


int main()
{ 
VICIntEnClr=0x00000080;
PINSEL0=0x00050005;
PINSEL1=0x00000000;
PINSEL2=0x00000000;
init();

IO1DIR=0xFFFF0000;

sendstring("ATe0\r\n");
delay();

sendstring("AT+CNMI=3,1,0,0,0\r\n");
delay();

IO1SET=0x00010000;
U1IER=0x01;

while(newmsg==0x00);
newmsg=0x00;

readmsg();
}

I'll remove the loop from the ISR later once my code starts working properly.

Thanks alot Atom for helping. I do appreciate it:)
Now only readind the SMS from the SIM is the problem..
 
Heya Atom!! :)
I've been able to sucessfully receive & read the SMS. But now when I re-enable the interrupt to receive new SMSes, the instant I reenable the interrupt using "VICIntEnable=0x80;" my code branches to the ISR and gets stuck there. Do you know why?

The code is as follows:
Code: 
#include<lpc214x.h>
extern unsigned char cmgf[]="AT+CMGF=1";	                        //Text format in GSM modem
extern unsigned char cmgsh[]="AT+CMGS=\"+############\"";          	//Mobile number to which the msg is sent
unsigned char cmgr[]="AT+CMGR=";
unsigned char newmsg=0x00;
unsigned char msgid;

void txu1(unsigned char data)				  //Transmit a byte of data through UART1
{
while(!(U1LSR & 0x20));
  U1THR=data;
}

unsigned char rxu1()
{
unsigned char p;
while ((U1LSR&0x01)!=1);
p=U1RBR;
return p;
}

void sendstring(unsigned char *p)			 //Sends a string of data through UART1
{
while(1)
{
if(*p=='\0') break;
txu1(*p++);
}
}


void delay()							  //delay function
{
int i,j;
for(i=0;i<60000;i++)
for(j=0;j<200;j++);
}


void readmsg()
{
int i,j;
unsigned char p[500];
unsigned char q[30];

VICIntEnClr=0x80; 
sendstring(cmgf);
txu1(0x0D);										// equivalent of 
txu1(0x0A);										//	 enter key
delay();
sendstring(cmgr);
txu1(msgid);
txu1(0x0D);
txu1(0x0A);
for(i=0;i<130;i++)
{
p[i]=rxu1();
if(p[i]=='%')
{
for(j=0;j<10;j++)
q[j]=rxu1();
q[10]='\0';
IO1SET=0x00070000;
break;
}
}

sendstring(cmgf);
txu1(0x0D);										// equivalent of 
txu1(0x0A);										//	 enter key
delay();
sendstring(cmgsh);
txu1(0x0D);
txu1(0x0A);	
delay();
sendstring(q);
txu1(0x1A);
delay();
txu1(0x1A);
IO1SET=0x00080000;
} 


void uart1_irq() __irq
{					  //ISR if anything is recieved in UART1
unsigned char p[13];
unsigned char q;
int i;

q=U1RBR;
if(q=='+')
{
for(i=0;i<12;i++)
{
p[i]=rxu1();
}
msgid=p[11];
p[12]='\0';

sendstring(cmgf);
txu1(0x0D);										// equivalent of 
txu1(0x0A);										//	 enter key
delay();
sendstring(cmgsh);
txu1(0x0D);
txu1(0x0A);	
delay();
sendstring(p);
txu1(0x1A);
delay();
txu1(0x1A);
IO1CLR=0x000F0000;
IO1SET=0x00020000;
newmsg=0x01;
}

VICVectAddr=0;
}

void init()								 //Initialization of UART0,UART1 and ISR
{
U1LCR=0x83;
U1DLL=0x62;
U1DLM=0x00;
U1LCR=0x03;
U1IER=0x01;
U1FCR=0X07;
VICIntSelect&=0xffffff7f;
VICVectAddr2=(unsigned int)uart1_irq;
VICIntEnable|=0x00000080;
VICVectCntl2=0x20|7; 
}


int main()
{ 
VICIntEnClr=0x00000080;
PINSEL0=0x00050005;
PINSEL1=0x00000000;
PINSEL2=0x00000000;
init();


IO1DIR=0xFFFF0000;

sendstring("ATe0\r\n");
delay();


sendstring("AT+CMGD=1,4\r\n");
delay();

sendstring("AT+CNMI=3,1,0,0,0\r\n");
delay();

IO1SET=0x00010000;
U1IER=0x01;
while(1)
{
IO1CLR=0x000F0000;
while(newmsg==0x00);
newmsg=0x00;
readmsg();
VICIntEnable=0x80;                                                    // here it branches to ISR
}
}

Summary: The first SMS which is received it read correctly and transmitted. But wen I re-enable the interrupt to receive more SMSes, it branches to the ISR andhangs der.. I know it hangs der coz the LED connected to P1.17 lights..

PLs help..
 
Have you tried clearing the IRQ flag after the interrupt? (well after newmsg=0x01; )

Page 170 states:

"The U1IIR must
be read in order to clear the interrupt prior to exiting the
Interrupt Service Routine"
Click to expand...
 
Last edited:
Heya Atom..
I found the problem. Actually wen I send an SMS, the GSM module sends back a string of the following form: "+CMGS: 65".
So the '+' sign was causing the interrupt. Therefore now I first read the buffer before exiting the readmsg() function as shown:

Code: 
for(i=0;i<130;i++)
{
p[i]=rxu1();
if(p[i]=='+')
break;
}

Now my entire code is working fine!!:)
Now all I have to do is integrate this code with my MEMS code & my project will be done!!
Muito muito obrigada Atom:)
 
Hi Atom!!
I've integrated the GSM code with my MEMS code but for some reason when an accident occurs or an SMS is receivd, the respective ISRs are not entered.. I just cannot understand why this is happening.
Pls check if I've initialised & handled the interrupts correctly...

Btw the main aim of my project is Accident Detection.. But I also have additional features that depend on the command sent to the GSM module via SMS.

Code: 
#include<lpc214x.h>
extern int msgflag=0;
unsigned char status;
unsigned char flag;
unsigned char data;
extern unsigned char cmgf[]="AT+CMGF=1";
unsigned char cmgr[]="AT+CMGR=";	                        //Text format in GSM modem
extern unsigned char cmgsh[]="AT+CMGS=\"+###########\"";          	//Mobile number to which the msg is sent
extern unsigned char msg[]="ACCIDENT!!!";						 		   //secret code
static unsigned char lat[10];
static unsigned char lon[11];
extern unsigned char cmgsp[]="AT+CMGS=\"+###########\""; 
unsigned char msgid;


unsigned char recuart0()				// recieves a byte from U0
{
unsigned char p;
while ((U0LSR&0x01)!=1);
p=U0RBR;
return p;
}


unsigned char rxu1()
{
unsigned char p;
while ((U1LSR&0x01)!=1);
p=U1RBR;
return p;
}

void senduart1(unsigned char a)					//sends a byte through U1
{
U1THR=a;
while(U1LSR!=0x60);
}


void sendstring(unsigned char *p)			 //Sends a string of data through UART1
{
while(1)
{
if(*p=='\0') break;
senduart1(*p++);
}
}



void  __irq IRQ_Eint3(void)		//EINT3 ISR
{  
msgflag=1;

EXTINT = 0x08;				
VICVectAddr = 0x00;   	
}	

void delaygsm()							  //delay function
{
int i,c=0;
for(i=0;i<40000;i++)
{
c++;
}
}


void recgps()			// receives a byte from U0
{
unsigned char p;
int gps=0;
int i;

while(gps==0)
{
p=recuart0();
while(p!='$')
{
p=recuart0();
}
p=recuart0();
if(p=='G')
{
}
else
continue;
p=recuart0();
if(p=='P')
{
}
else
continue;
   p=recuart0();
if(p=='G')
{
}
else
continue ;
	p=recuart0();

if(p=='G')
{
}
else
continue;
	   p=recuart0();

if(p=='A')
{
while(p!=',')
{
   p=recuart0();
}
   p=recuart0();
while(p!=',')
{
	  p=recuart0();
}
for(i=0;i<9;i++)
{
lat[i]=recuart0();
}
	p=recuart0();
while(p!=',')
{
	p=recuart0();
}
	p=recuart0();
while(p!=',')
{
	 p=recuart0();
}
for(i=0;i<10;i++)
{
lon[i]=recuart0();
}
lat[9]='\0';
lon[10]='\0';
gps=1;
}
else
continue;
}
}


void sendloc()
{
recgps();
sendstring(cmgf);									
delaygsm();
sendstring(cmgsh);
senduart1(0x0D);
senduart1(0x0A);	
delaygsm();
sendstring("LAT: ");
sendstring(lat);
senduart1(0x0a);
senduart1(0x0d);
sendstring("LON: ");
sendstring(lon);
senduart1(0x1A);
delaygsm();
senduart1(0x1A);
}


void readmsg()
{
int i,j;
unsigned char p[500];
unsigned char q[30];
VICIntEnClr|=0x80; 
sendstring(cmgf);									
delaygsm(); 
sendstring(cmgr);
senduart1(msgid);
senduart1(0x0D);
senduart1(0x0A);
for(i=0;i<130;i++)
{
p[i]=rxu1(); 
if(p[i]=='%')
{ 
for(j=0;j<3;j++)
q[j]=rxu1();
q[3]='\0';
break;
}
}

if(q[0]=='1'){ sendloc();
			  IO1SET=0x00010000; }  // cut-off fuel supply
			   
if(q[0]=='2'){    sendloc();
			      IO1SET=0x00020000; }  

if(q[0]=='3'){ int i;
                  for(i=0;i<3;i++)
				  {
			        sendloc();
					delaygsm();      //5 mins delay
				  }  
				           }

for(i=0;i<130;i++)
{
p[i]=rxu1();
if(p[i]=='+')
break;
}
VICIntEnable|=0x80;
} 


void uart1_irq() __irq
{					  //ISR if anything is recieved in UART1
unsigned char p[13];
unsigned char q;
int i;
q=U1RBR;
if(q=='+')
{
for(i=0;i<12;i++)
{
p[i]=rxu1();
}
msgid=p[11];
}
VICVectAddr=0;
readmsg();
}

void intSetup()		 //This function setups EINT3
{
 
 EXTMODE = (1<<3);	// EINT3 is edge sensitive
 EXTPOLAR = (0<<3);					// EINT3 in triggered on falling edge

 VICIntSelect = 0x00000000;		// Setting EINT3 as IRQ(Vectored)
 VICVectCntl0 = 0x20|17;		// Assigning Highest Priority Slot to EINT3 and enabling this slot
 VICVectAddr0 = (int)IRQ_Eint3; // Storing vector address of EINT3
 EXTINT = 0x08;	//Clearing EINT3 flag	
 VICIntEnable = (1<<17);	// Enable EINT3
}


void start()
{
I2C0CONSET=0x20;
}


void stop()
{
I2C0CONSET=0x10;
}


unsigned char state(unsigned char number)
{
while(flag==0);
flag=0;
if(status!=number)
{ return 1; }
else
{ return 0;}
}



void __irq intt(void)
{
flag=0xFF; 			//update status flag
status=I2C0STAT;				//Read Status byte
I2C0CONCLR=0x28; 
VICVectAddr = 0x00;   		//Acknowledge Interrupt
}


unsigned char read(unsigned char place1)
 {
 start();
 if(state(0x08))
 {
  return 1;
 }
 I2C0DAT=0x38;
 if(state(0x18))
 {
  return 1;
 }
I2C0DAT=place1;
if(state(0x28))
{
 return 1;
 }
start();
if(state(0x10))
{
return 1;
}
I2C0DAT=0x39;
if(state(0x40))
{
return 1;
}
I2C0CONCLR=0x04;
if(state(0x58))
{
return 1;
}
data=I2C0DAT;
stop();
 return 0;
 }


 
 unsigned char write(unsigned char place,unsigned char text)
 {
 start();
 if(state(0x08))
 {
  return 1;
 }
 I2C0DAT=0x38;
 if(state(0x18))
 {
 return 1;
 }
I2C0DAT=place;
if(state(0x28))
{
 return 1;
 }
I2C0DAT=text;
if(state(0x28))
{
 return 1;
 }
 stop();
 return 0;
 }



void initi2c()
{
PINSEL0&=0xFFFFFF0F;
PINSEL0|=0x00000050;

 I2C0CONCLR=0x6C;
 I2C0CONSET=0x40;
 I2C0SCLH=80;
 I2C0SCLL=70;
 VICIntSelect = 0x00000000;		// Setting all interrupts as IRQ(Vectored)
 VICVectCntl1 = 0x20 | 9;		// Assigning Highest Priority Slot to I2C0 and enabling this slot
 VICVectAddr1 = (unsigned long)intt; // Storing vector address of I2C0
 VICIntEnable = (1<<9);
 }


void i2cperform()
{
PINSEL0|=0x00050005;
PINSEL1|= 0x20000000;
PINSEL2|=0x00000000;

initi2c();
write(0x2A,0x18);
write(0x15,0x78);
write(0x17,0x15);
write(0x18,0x0A);
write(0x2D,0x04);
write(0x2E,0x04);
data=read(0x2A);
data|=0x01;
write(0x2A,data);
}

void initgsm()								 //Initialization of UART0,UART1 and ISR
{ 
U0LCR=0x83;
U0DLL=0x62;
U0DLM=0x00;
U0LCR=0x03;
U1LCR=0x83;
U1DLL=0x62;
U1DLM=0x00;
U1LCR=0x03;
U1IER=0x01;
U1FCR=0X07;
VICIntSelect&=0xffffff7f;
VICVectAddr2=(unsigned int)uart1_irq;
VICIntEnable|=0x00000080;
VICVectCntl2=0x20|7; 
}


void gsmperform(void)
{
PINSEL0|=0x00050005;
PINSEL1|=0x00000000;
PINSEL2|=0x00000000;
initgsm();
sendstring("ATe0\r\n");
delaygsm();
sendstring("AT+CNMI=3,1,0,0,0\r\n");
delaygsm();
}





void sendmsg(void)
{
recgps();
sendstring(cmgf);
senduart1(0x0D);										// equivalent of 
senduart1(0x0A);										//	 enter key
delaygsm();
sendstring(cmgsh);
senduart1(0x0D);
senduart1(0x0A);	
delaygsm();
sendstring(msg);
senduart1(0x0a);
senduart1(0x0d);
sendstring("LAT: ");
sendstring(lat);
senduart1(0x0a);
senduart1(0x0d);
sendstring("LON: ");
sendstring(lon);
senduart1(0x1A);
delaygsm();
senduart1(0x1A);

sendstring(cmgf);
senduart1(0x0D);										// equivalent of 
senduart1(0x0A);										//	 enter key
delaygsm();
sendstring(cmgsp);
senduart1(0x0D);
senduart1(0x0A);	
delaygsm();
sendstring(msg);
senduart1(0x0a);
senduart1(0x0d);
sendstring("LAT: ");
sendstring(lat);
senduart1(0x0a);
senduart1(0x0d);
sendstring("LON: ");
sendstring(lon);
senduart1(0x1A);
delaygsm();
senduart1(0x1A);
}


int main()
{
PINSEL0 = 0x00000000;		// Enable GPIO on all pins
PINSEL1 = 0x00000000;
PINSEL2 = 0x00000000;

intSetup();
i2cperform();
gsmperform();

while(1)
{
if(msgflag==1)
{
sendmsg();
msgflag=0;
IO1DIR=0xFFFF0000;
IO1SET=0x000F0000;
}
}
}
 
Can any one halp me in code to solve the error....???


#define CR 0x0D
#include <LPC21xx.H>
#include <stdio.h>
void getstring(unsigned char *);
int getchar (void) /* Read character from Serial Port */
void status_ok(void);
void Serial_Init(void);
void delay(unsigned int n);
void main(void)
{
unsigned int cnt=0x80,m;
char xx;
Serial_Init();
delay(50);
while(1)
{
printf("AT\r"); // AT COMMAND FOR INITIALING
status_ok();
printf("AT+IPR=9600\r"); // AT COMMAND FOR BAUD RATE
status_ok();
printf("AT+CMGR=2\r"); // Reading the message detail
// at Index 1 with phone number, data and time
status_ok();
delay(250);
printf("ATD9727855007;\r");//AT COMMAND FOR CALL DIALING
delay(250);
status_ok();
delay(500);
delay(500);
delay(500);
delay(500);
delay(500);
delay(500);
printf("ATH\r"); // AT COMMAND FOR CALL DISCONNECTING
delay(250);
status_ok();
delay(500);
delay(500);
printf("ATDL\r"); // AT COMMAND FOR REDIALING
delay(250);
status_ok();
delay(500);
delay(500);
printf("ATH\r"); // AT COMMAND FOR ANSWERING THE CALL
delay(250);
status_ok();
delay(500);
delay(500);
}
}
void getstring(unsigned char *array)
{
unsigned char temp=0, i=0;
do
{
temp = getchar();
*array++ = temp;
}
while((temp != '\r') && (temp != '\n'));
*array = '\0';
}
int getchar (void) /* Read character from Serial Port */
{
while (!(U0LSR & 0x01));
return (U0RBR);
}
void status_ok(void)
{
getstring(y);
while(!(strstr(y,"OK"))) getstring(y);
pointr = strstr(y,"OK");
lcd_cmd(0xc0);
lcd_data(*pointr++);
lcd_data(*pointr);
delay(500);
lcd_cmd(0x01);
}
void Serial_Init(void)
{
PINSEL0 |= 0X00000005; //Enable Txd0 and Rxd0
U0LCR = 0x00000083; //8-bit data, no parity, 1-stop bit
U0DLL = 0x00000061; //for Baud rate=9600,DLL=82
U0LCR = 0x00000003; //DLAB = 0;
}
void delay(unsigned int n)
{
unsigned int i,j;
for(i=0;i<n;i++)
{
for(j=0;j<12000;j++)
{;}
}
}





#define CR 0x0D
#include <LPC21xx.H>
#include <stdio.h>
void getstring(unsigned char *);
int getchar (void) /* Read character from Serial Port */
void status_ok(void);
void Serial_Init(void);
void delay(unsigned int n);
void main(void)
{
unsigned int cnt=0x80,m;
char xx;
Serial_Init();
delay(50);
while(1)
{
printf("AT\r"); // AT COMMAND FOR INITIALING
status_ok();
printf("AT+IPR=9600\r"); // AT COMMAND FOR BAUD RATE
status_ok();
printf("AT+CMGR=2\r"); // Reading the message detail
// at Index 1 with phone number, data and time
status_ok();
delay(250);
printf("ATD9790550124;\r");//AT COMMAND FOR CALL DIALING
delay(250);
status_ok();
delay(500);
delay(500);
delay(500);
delay(500);
delay(500);
delay(500);
printf("ATH\r"); // AT COMMAND FOR CALL DISCONNECTING
delay(250);
status_ok();
delay(500);
delay(500);
printf("ATDL\r"); // AT COMMAND FOR REDIALING
delay(250);
status_ok();
delay(500);
delay(500);
printf("ATH\r"); // AT COMMAND FOR ANSWERING THE CALL
delay(250);
status_ok();
delay(500);
delay(500);
}
}
void getstring(unsigned char *array)
{
unsigned char temp=0, i=0;
do
{
temp = getchar();
*array++ = temp;
}
while((temp != '\r') && (temp != '\n'));
*array = '\0';
}
int getchar (void) /* Read character from Serial Port */
{
while (!(U0LSR & 0x01));
return (U0RBR);
}
void status_ok(void)
{
getstring(y);
while(!(strstr(y,"OK"))) getstring(y);
pointr = strstr(y,"OK");
lcd_cmd(0xc0);
lcd_data(*pointr++);
lcd_data(*pointr);
delay(500);
lcd_cmd(0x01);
}
void Serial_Init(void)
{
PINSEL0 |= 0X00000005; //Enable Txd0 and Rxd0
U0LCR = 0x00000083; //8-bit data, no parity, 1-stop bit
U0DLL = 0x00000061; //for Baud rate=9600,DLL=82
U0LCR = 0x00000003; //DLAB = 0;
}
void delay(unsigned int n)
{
unsigned int i,j;
for(i=0;i<n;i++)
{
for(j=0;j<12000;j++)
{;}
}
}
#define CR 0x0D
#include <LPC21xx.H>
#include <stdio.h>
void getstring(unsigned char *);
int getchar (void) /* Read character from Serial Port */
void status_ok(void);
void Serial_Init(void);
void delay(unsigned int n);
void main(void)
{
unsigned int cnt=0x80,m;
char xx;
Serial_Init();
delay(50);
while(1)
{
printf("AT\r"); // AT COMMAND FOR INITIALING
status_ok();
printf("AT+IPR=9600\r"); // AT COMMAND FOR BAUD RATE
status_ok();
printf("AT+CMGR=2\r"); // Reading the message detail
// at Index 1 with phone number, data and time
status_ok();
delay(250);
printf("ATD9790550124;\r");//AT COMMAND FOR CALL DIALING
delay(250);
status_ok();
delay(500);
delay(500);
delay(500);
delay(500);
delay(500);
delay(500);
printf("ATH\r"); // AT COMMAND FOR CALL DISCONNECTING
delay(250);
status_ok();
delay(500);
delay(500);
printf("ATDL\r"); // AT COMMAND FOR REDIALING
delay(250);
status_ok();
delay(500);
delay(500);
printf("ATH\r"); // AT COMMAND FOR ANSWERING THE CALL
delay(250);
status_ok();
delay(500);
delay(500);
}
}
void getstring(unsigned char *array)
{
unsigned char temp=0, i=0;
do
{
temp = getchar();
*array++ = temp;
}
while((temp != '\r') && (temp != '\n'));
*array = '\0';
}
int getchar (void) /* Read character from Serial Port */
{
while (!(U0LSR & 0x01));
return (U0RBR);
}
void status_ok(void)
{
getstring(y);
while(!(strstr(y,"OK"))) getstring(y);
pointr = strstr(y,"OK");
lcd_cmd(0xc0);
lcd_data(*pointr++);
lcd_data(*pointr);
delay(500);
lcd_cmd(0x01);
}
void Serial_Init(void)
{
PINSEL0 |= 0X00000005; //Enable Txd0 and Rxd0
U0LCR = 0x00000083; //8-bit data, no parity, 1-stop bit
U0DLL = 0x00000061; //for Baud rate=9600,DLL=82
U0LCR = 0x00000003; //DLAB = 0;
}
void delay(unsigned int n)
{
unsigned int i,j;
for(i=0;i<n;i++)
{
for(j=0;j<12000;j++)
{;}
}
}
#define CR 0x0D
#include <LPC21xx.H>
#include <stdio.h>
void getstring(unsigned char *);
int getchar (void) /* Read character from Serial Port */
void status_ok(void);
void Serial_Init(void);
void delay(unsigned int n);
void main(void)
{
unsigned int cnt=0x80,m;
char xx;
Serial_Init();
delay(50);
while(1)
{
printf("AT\r"); // AT COMMAND FOR INITIALING
status_ok();
printf("AT+IPR=9600\r"); // AT COMMAND FOR BAUD RATE
status_ok();
printf("AT+CMGR=2\r"); // Reading the message detail
// at Index 1 with phone number, data and time
status_ok();
delay(250);
printf("ATD9790550124;\r");//AT COMMAND FOR CALL DIALING
delay(250);
status_ok();
delay(500);
delay(500);
delay(500);
delay(500);
delay(500);
delay(500);
printf("ATH\r"); // AT COMMAND FOR CALL DISCONNECTING
delay(250);
status_ok();
delay(500);
delay(500);
printf("ATDL\r"); // AT COMMAND FOR REDIALING
delay(250);
status_ok();
delay(500);
delay(500);
printf("ATH\r"); // AT COMMAND FOR ANSWERING THE CALL
delay(250);
status_ok();
delay(500);
delay(500);
}
}
void getstring(unsigned char *array)
{
unsigned char temp=0, i=0;
do
{
temp = getchar();
*array++ = temp;
}
while((temp != '\r') && (temp != '\n'));
*array = '\0';
}
int getchar (void) /* Read character from Serial Port */
{
while (!(U0LSR & 0x01));
return (U0RBR);
}
void status_ok(void)
{
getstring(y);
while(!(strstr(y,"OK"))) getstring(y);
pointr = strstr(y,"OK");
lcd_cmd(0xc0);
lcd_data(*pointr++);
lcd_data(*pointr);
delay(500);
lcd_cmd(0x01);
}
void Serial_Init(void)
{
PINSEL0 |= 0X00000005; //Enable Txd0 and Rxd0
U0LCR = 0x00000083; //8-bit data, no parity, 1-stop bit
U0DLL = 0x00000061; //for Baud rate=9600,DLL=82
U0LCR = 0x00000003; //DLAB = 0;
}
void delay(unsigned int n)
{
unsigned int i,j;
for(i=0;i<n;i++)
{
for(j=0;j<12000;j++)
{;}
}
}
 
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