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can't read & compare data needed for reading sms functio

 
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vjn86



Joined: 12 Oct 2009
Posts: 11

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can't read & compare data needed for reading sms functio
PostPosted: Fri Dec 25, 2009 9:17 am     Reply with quote
Hi all, I am trying to write a program that read incoming sms from a GSM modem and sends back a acknowledgment message to the defined number. The acknowledgment message named "hey" should be sent if the mydata[] and mydata1[] are equal and it should send "error" if it isn't equal.

If I define both array:
as equal :
( mydata [] = test ;mydata1[]= test)

or
not equal:
( mydata [] = test ;mydata1[]= testing),

I'm able to get desired output... The problem starts when i try to compare a stream named mydata[] and defined string named mydata1[]= "+CMTI: \"SM\",1/n" as shown in coding. When i use this, I'm not even getting a error message.... What am i possibly wrong at ?

p/s : If I receiving message at location 1, the indication is +CMTI: "SM",1

thanks
Code:

#use delay(clock=20000000)
#fuses hs,nowdt,nolvp,noprotect
#use rs232(baud=9600, bits=8, parity=N, stop=1, xmit=PIN_C6, rcv=PIN_C7, stream=mydata[],)

void main()
{
char mydata[];
  char mydata1[]= "+CMTI: \"SM\",1/n";
  set_tris_c(0x80);
  printf("at\r\n");
  delay_ms(500);
  gets(mydata);

 if(strcmp (mydata,mydata1)==0)
      {
         printf("at+cmgf=1\r\n");
         delay_ms(500);     
         printf("at+csmp=17,168,0,0\r\n");
         delay_ms(500);
         printf("at+cmgs=\"+60136240915\"\r\n");
         delay_ms(3000);
         printf("hey ");
         putc(0x1A);
         delay_ms(10000);
      }
      else
      {
         printf("at+cmgf=1\r\n");
         delay_ms(500);     
         printf("at+csmp=17,168,0,0\r\n");
         delay_ms(500);
         printf("at+cmgs=\"+60136240915\"\r\n");
         delay_ms(3000);
         printf("error ");
         putc(0x1A);
         delay_ms(10000);         
      }
}
vjn86



Joined: 12 Oct 2009
Posts: 11

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PostPosted: Sun Jan 24, 2010 12:32 pm     Reply with quote
erm..can't anyone advice me what to do next ?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Jan 24, 2010 12:48 pm     Reply with quote
Quote:
char mydata[];

Where's the size on this ? You have allocated a pointer, but no storage
locations.

Quote:
gets(mydata);

Here you're filling up memory locations, starting at the pointer address,
but the memory locations don't belong to the array. They could belong
to anything else.
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