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read SMS

 
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idm852



Joined: 09 Apr 2013
Posts: 4

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read SMS
PostPosted: Tue Apr 09, 2013 9:40 am     Reply with quote
hi
I want to Extract the contents of an sms received by my modem.
I do not control perfectly the PCW compiler for that I can not store characters received RS232 in a table. In fact, I receive this frame which I want to extract the date and sender number and content of SMS. for example, if I receive this frame:

+CMGL: 1,"REC UNREAD","+85291234567",,"07/02/18,00:05:10+32"
Reading text messages is easy.

I want to store the date in a table TD, the time in another table TH and TC content in a table for later use

TD : 07/02/18
TH: 00:05:10
TC: Reading text messages is easy.

Best Regards


idm852



Joined: 09 Apr 2013
Posts: 4

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PostPosted: Tue Apr 09, 2013 9:57 am     Reply with quote
I use PIC18F2550 and GL865.
I can communicate with the module for sending and receiving. My problem is that after sending the command "AT + CMGR = 1 \ r" I want to store the received frame in table then use this table to retrieve the date, time and message in the other tables.

Can you help me???????
ezflyr



Joined: 25 Oct 2010
Posts: 1019
Location: Tewksbury, MA

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PostPosted: Tue Apr 09, 2013 11:53 am     Reply with quote
Hi,

It's not that hard to do once you can actually receive the data from the GSM model following the +CMGR command.

I setup two arrays, MSG1 and MSG2, to handle the two lines of data returned from the modem. The returned data actually looks like this:

Code:

<CR><LF>+CMGR: "REC UNREAD","+19785551212","","11/12/09,09:04:24-20"<CR><LF>
Output 1 On<CR><LF>


So, you need to setup a reading loop that is 'aware' of the carriage returns <CR>, and linefeeds <LF> that are part of the data being sent, and then fill the two message arrays accordingly.

Here is part of the code to illustrate my technique:

Code:

do
   {
      if(bkbhit)
      {
         TempChar = bgetc();
         if (TempChar == '\r')
            iReturnIndex++;


         if ((iReturnIndex == 1) && (TempChar != '\r') && (TempChar != '\n'))
         {
            Msg1[ArrayIndex1] = TempChar;
            ArrayIndex1++;
            if (ArrayIndex1 > 70)
               return; //Msg1 buffer has overflowed, so exit the subroutine!
         }

// Code for the 2nd Message array goes here......

   } while (iReturnIndex < 4);


When this code executes, you'll have the 2 lines of data neatly in two arrays. Also, be sure to do this:

Code:

   // Here we null terminate the two Msg lines from the ADH8066 module
   Msg1[ArrayIndex1++] = '\0';
   Msg2[ArrayIndex2++] = '\0';


That should get you started!

John
idm852



Joined: 09 Apr 2013
Posts: 4

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PostPosted: Tue Apr 09, 2013 3:05 pm     Reply with quote
bkbhit and bgetc ?
I put them in the code but the PCW Compiler does not accept.

undefined identifier bkbhit
undefined identifier bgetc
idm852



Joined: 09 Apr 2013
Posts: 4

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PostPosted: Tue Apr 09, 2013 3:11 pm     Reply with quote
My plan is to store the received SMS and send them through a serial link (Xmit: B6, RCV: B7) to the computer in order and with a new layout as the context of the message, and then Date and time finally, the number of the sender.
Here is the core of my code:
Code:

#include <18F2550.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6,rcv=pin_C7, parity=N,STREAM=GSM)
#use rs232(baud=9600, xmit=PIN_B6,rcv=pin_B7, parity=N, STREAM=PC)
#include <string.h>

void main()
{
output_low(PIN_b1);
output_low(PIN_b2);
output_low(PIN_b3);
output_low(PIN_b4);

while(true)
  {   
   output_low(PIN_b1);
   output_low(PIN_b2);
   output_low(PIN_b3);
   output_low(PIN_b4);
   delay_ms(1000);
   output_high(PIN_b1);
   fprintf(PC,"initialisation\r");
   delay_ms(1000);
   fprintf(GSM,"AT\r");
   delay_ms(1000);
   fprintf(GSM,"AT+IPR=9600\r");
   delay_ms(1000);
   output_high(PIN_b2);
   fprintf(GSM,"AT+CMGF=1\r");
   delay_ms(1000);
   fprintf(GSM,"AT+CMGR=1\r");
   delay_ms(2000);
         
   Receive();

   Send_PC();
  }
}
ezflyr



Joined: 25 Oct 2010
Posts: 1019
Location: Tewksbury, MA

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PostPosted: Tue Apr 09, 2013 5:43 pm     Reply with quote
Hi,

I'm sorry, I misunderstood your earlier post and assumed that you were much further along with this project than you apparently are.....

I use a circular buffer to receive incoming data from the GSM modem, and bkbhit and bgetc are part of that code. Have a look at 'ex_sisr.exe' to see how it's done.

You definitely want to put the GSM modem on the hardware serial pot of the PIC, and your PC on a software serial port. You also want to add 'Errors' to the hardware serial port #use rs232 statement.

If some of this does not make sense, search the forum and the CCS provided example programs for the answers before asking here on the forum!

John
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