How can i Extract Sms Message From AT command response

Yeah Romel, Check this link
http://www.8051projects.net/forum-t41321.html
Here Mojaka and Ajay has given very good suggestions.

thaks kiran i will try that..

any update of this thread?? is ti done?

romel_emperado

@romel_emperado

as for the project,it worked very well but i had issues with responding to a second command after the first one,i tryed clearing msg1 and reseting abc = 0 after reception but didnt work.
so any ideas is still welcomed.

@Dave Chika,
Try using arrays not pointers in read_msg().
If i use that function controller was getting reset by itself.

@Dave Chika,
Try using arrays not pointers in read_msg().
If i use that function controller was getting reset by itself.

kirangowle

@kirangowle
pls i need more clarity here,a line or two of codes will be sufficient.

like this

void read_msg(unsigned char msg[])
{
char i;
i=59 //  i am manually moving the location to the starting char of recd msg.
while(msg[i]!= '\r')
{
lcddata(msg[i]);// display the msg on LCD.
i++;
}

Sorry for reviving this thread.
why do I get error at my LCD? Im using the code of majoka(downloaded the array.rar file.) and use the latest code he suggested.

hope someone would reply.
thanks.

What kind of error you are getting on LCD.
and paste your code here.

@ DaveChika
@ jepoy12

what are the latest problems that anyone facing here with my code
i will explain that
there can be many reasons of errors
and are u using modem or any cell phone
and also paste code here then i will guess where can be the problem

Thanks for the reply.
Heres the code I used and the result. Im using a modem btw.

#include <REGX52.H>


#define LCD P1
#define LCD_EN		0x80
#define LCD_RS		0x20
                     
//LCD Commands        

#define LCD_SETMODE		   0x04
#define LCD_SETVISIBLE	   0x08
#define LCD_SETFUNCTION	   0x28
#define LCD_SETDDADDR	   0x80

void delayms(unsigned char);
void delayus(unsigned char);
void lcd_init();
void lcd_reset();
void lcd_cmd (char);
void lcd_data(unsigned char);
void lcd_str (unsigned char *);
void clear(void);
void tx0(unsigned char);
void delay_sms (unsigned int);
void SMSString(char*text) ;
void init();
void read_text(unsigned char * , unsigned char * , unsigned char *);

unsigned char j,abc;
unsigned char idata msg1[150];
unsigned char rec_no[20];
unsigned char time_date[20];


void serial () interrupt 4
{
msg1[abc]=SBUF;
abc++;
RI=0;
}

void main (void)
{
/*
if u do not want to check "OK" response after each AT command then
enable interrupt IE=0X90 ; after last AT command of  
SMSString( "AT+CMGR=1\r"); // AT command to read sms
so after that u recieve a no of bytes from modile if u disable it then u do not reieve
it even data comes

use a virtual terminal in Proteus
run a Proteus and right click on virtual terminal and click on option echo character display.
in Proteus there is no mobile model so u should enter text in hyper terminal to suppose gsm Modem is responding.
use serial receive interrupt to receive data
check here

*/
clear();
init();
lcd_init();

SMSString("AT\r"); // AT commands to initialize gsm modem
delay_sms(1000);

SMSString( "ATe0\r"); // turn off echo
delay_sms(1000);

SMSString( "AT&W\r"); // save settings
delay_sms(1000);

SMSString( "AT+CMGF=1\r"); // select text mode for sms
delay_sms(1000);

SMSString( "AT+CNMI=2,1,0,0,0\r"); // notification of new sms
delay_sms(1000);

SMSString( "AT+CMGR=901\r"); // AT command to read sms
IE=0X90;   // Enable serial interrupt
delay_sms(2000);

/* i get a response like this

// +CMGR: "REC READ" ,"+2347060580383","10/10/23,14:29:33+04" 
// device1 off 
// Ok. */

// read sms and store in buffer msg1

read_text(msg1,rec_no,time_date);
clear();
IE=0X00;     // Disable all interrupt
while(1);
}


void init(void)
{
j=0;
abc=0;
TL1=0XFD; //9600 @ 11.0592
TH1=0xFD;
TMOD=0x20;
SCON=0x50;
TR1=1;
}

void SMSString(unsigned char* text) //function to send SMS using GSM modem
{
while (*text)
{
tx0(*text++);
}
}


void tx0(unsigned char x) //send data to serial port 0
{
EA=0;
SBUF=x;
while(TI==0);
TI=0;
EA=1;
}


void delay_sms (unsigned int count)
{
unsigned int i;                         // Keil v7.5a 
    while(count) {
        i = 115;
                while(i>
0) i--;
        count--;
}
}

void read_text( unsigned char *msg,unsigned char *no ,unsigned char *time)
{
unsigned char *temp;
temp=msg;
do
msg++;
while(*msg!='+');        
do
msg++;
while(*msg!='+');         //  reaching at no
do
*no++=*msg++;
while(*msg!='"');         // reaching at time
*no++='\0';
msg++;
msg++;
msg++;
do
*time++=*msg++;
while(*msg!='+');         // raching at message
*time='\0';
do
msg++;
while(*msg!='\n');
msg++;
do
*temp++=*msg++;
while(*msg!='\r');       // reaching at end of message
*temp='\0';

lcd_cmd(0x80);            // ist line address
lcd_str(rec_no);          // array having receipt no
lcd_cmd(0xC0);            // 2nd line address
lcd_str(time_date);       // array having date and time
lcd_cmd(0x94);            // 3rd line address
lcd_str(msg1);            // array having message 
}


void lcd_reset()
{
	LCD = 0xFF;
	delay_sms(40);
	LCD = 0x03+LCD_EN;
	LCD = 0x03;
	delay_sms(40);
	LCD = 0x03+LCD_EN;
	LCD = 0x03;
	delay_sms(5);
	LCD = 0x03+LCD_EN;
	LCD = 0x03;
	delay_sms(5);
	LCD = 0x02+LCD_EN;
	LCD = 0x02;
	delay_sms(5);
}


void lcd_init ()
{
	lcd_reset();
	lcd_cmd(LCD_SETFUNCTION);                    // 4-bit mode - 1 line - 5x7 font. 
	lcd_cmd(LCD_SETVISIBLE+0x04);                // Display no cursor - no blink.
	lcd_cmd(LCD_SETMODE+0x02);                   // Automatic Increment - No Display shift.
	lcd_cmd(LCD_SETDDADDR);                      // Address DDRAM with 0 offset 80h.
 }

 void lcd_cmd (char cmd)
{ 
	LCD = ((cmd >
>
 4) & 0x0F)|LCD_EN;
	LCD = ((cmd >
>
 4) & 0x0F);

	LCD = (cmd & 0x0F)|LCD_EN;
	LCD = (cmd & 0x0F);

    delay_sms(1);
}

void lcd_data (unsigned char dat)
{ 
	LCD = (((dat >
>
 4) & 0x0F)|LCD_EN|LCD_RS);
	LCD = (((dat >
>
 4) & 0x0F)|LCD_RS);
	
	LCD = ((dat & 0x0F)|LCD_EN|LCD_RS);
	LCD = ((dat & 0x0F)|LCD_RS);

    delay_sms(1);
}

void clear(void)
{
unsigned char a;
for(a=0;a<100;a++)
msg1[a]=0x00;
}

void lcd_str (unsigned char *str)
{
	while(*str){
		lcd_data(*str++);
	}
}