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How to make a Long String from a Buffer(array)

 
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saholt



Joined: 07 Oct 2003
Posts: 3
Location: North Wales. UK

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How to make a Long String from a Buffer(array)
PostPosted: Thu Dec 01, 2011 4:19 pm     Reply with quote
I can read the serial number using the example from ex_touch.c and display it on lcd no problem.

I am however, having problems in trying to make a long string from an array.

I am readng the serial number from an iButton (DS1990a). I get the following;

Code:

Array  [0]  [1]   [2]  [3]   [4]  [5]   [6]  [7]
buffer  01   2D    C5   B8    00   00    00   BC       

What I want to do is to put this into 1 long string i.e. "012DC5B8000000BC". Thinking this would be an easy way to check whether it was valid against stored serial numbers using strcmp.

I am trying the following but only get '0's in cString1.

Code:

   BYTE buffer[8];
   Char cString [9];
   Char cString1 [9];

        for(i=0;i<8;++i)                    // Set i between 0 & 8
         {
          buffer[i]=touch_read_byte();     // Read 8 bytes of button data * Works *
          sprintf(cString,"%c",buffer[i]);   // Convert to string
          strcat(cString1,cString);            // Concatenate s2 onto s1
         }


Any pointers where i'm going wrong or even simpler methods

Using PIC16F877A
compiler version 4.110.

Thanks in advance
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Dec 01, 2011 5:25 pm     Reply with quote
If you want to convert binary to ascii hex. Use "%x", not "%c".
This is in the manual. See the printf section.
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