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fwrite or f_write and what library do they need?

 
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Koska



Joined: 05 Dec 2014
Posts: 3

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fwrite or f_write and what library do they need?
PostPosted: Sat Dec 20, 2014 1:41 pm     Reply with quote
Hello,

I need to use the function fwrite() in my code. From the link below I understood it is necessary to include at the top the library

Code:
#include<stdio.h>


http://www.tutorialspoint.com/c_standard_library/c_function_fwrite.htm

But I built my project with CCS 5 and I got the following error:

*** Error 12 "code.c" Line 280(9,10): Undefined identifier -- fwrite

So I went to the folder drivers into PICC and I opened to check the content of stdio.h and I could see there is nothing there about fwrite.

Code:

///////////////////////////////////////////////////////////////////////////
////        (C) Copyright 1996,2003 Custom Computer Services           ////
//// This source code may only be used by licensed users of the CCS C  ////
//// compiler.  This source code may only be distributed to other      ////
//// licensed users of the CCS C compiler.  No other use, reproduction ////
//// or distribution is permitted without written permission.          ////
//// Derivative programs created using this software in object code    ////
//// form are not restricted in any way.                               ////
///////////////////////////////////////////////////////////////////////////

#ifndef _STDIO
#define _STDIO
#include <string.h>
#ifndef getc
#define getc getch
#define getchar getch
#define puts(s) {printf(s); putchar(13); putchar(10);}
#define putc putchar
#endif
/* maps error number to an error message. Writes a sequence of characters to
stderr stream thus: if s is not null then string pointed to by s follwed by
a colon (:) and a space and the appropriate error message returned by strerror
function with argument errno

Returns: no value
*/

#ifdef _ERRNO
void perror(char *s)
{
  if(s)
  fprintf(STDERR,"%s: ",s);
  fprintf(STDERR,"%s\r\n",strerror(errno));
}
#endif
#endif


So my question is: Should I include another function and what I read is not correct for CCS, or the problem is my version of CCS has a corrupted stdio.h? Probably the problem is completly different to what I'm thinking.



In Addition, I was reading in this forum trying to find a solution on my own, and I saw some people use f_write() instead. Is is a better option? I couldn't find much information about f_write

Thank you very much for your help!

Last edited by Koska on Sat Dec 20, 2014 4:17 pm; edited 1 time in total
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Dec 20, 2014 2:55 pm     Reply with quote
I assume this is for an SD card. What drivers are you using to interface
to the SD card ?

If you use the CCS fat.c driver, then the comments at the top of the file
say to use the fatwrite() function. The file is in this directory:
Quote:
c:\program files\picc\drivers\fat.c



Quote:
or the problem is my version of CCS has a corrupted stdio.h?

stdio.h is not corrupted.
Koska



Joined: 05 Dec 2014
Posts: 3

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PostPosted: Sat Dec 20, 2014 3:49 pm     Reply with quote
Thank you for your reply PCM Programmer. But actually I'm not trying to write on a SD card. I'm trying to send information that I previously read from a SD card via Bluetooth.

So what I have is a stream called BT:
Code:

#use RS232(UART, baud = 115200, xmit = PIN_C6 ,rcv = PIN_C7, PARITY = N, bits = 8, stop = 1, stream = BT)

char buffer_data[129];
int NumOfBytes = 128;
int32 Address = 0xXXXXXXXX;//any address

//Here I read from the SDcard. I wrote this function using mmcsd.c
GetFileContent(Address, NumOfBytes,  &buffer_data);


At this point I have in buffer_data the bytes I want to send. What I was doing before, and worked perfectly with .txt was this:

Code:
buffer_data[NumOfBytes] = 0x00;// To set an end of the relevant data
printf(BT, buffer_data);


But the problem is when I try to send a .pdf because in memory sometimes appears the character 0x00, so printf don't send all the content of buffer_data. It will stop when finds 0x00.

So I was looking for another function where I could include the number of bytes I want that are sent. And I read about fwrite(), and I changed the printf() for:
Code:

fwrite (buffer_data , sizeof(char), NumOfBytes, BT);



And here is where I found the problem I mention above.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Dec 21, 2014 8:19 pm     Reply with quote
There is no built-in fwrite() function. I suggest that you use fputc()
in a for() loop to send the data.
Ttelmah



Joined: 11 Mar 2010
Posts: 19544

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PostPosted: Mon Dec 22, 2014 3:55 am     Reply with quote
Understand, that 'fwrite' is for dealing with a file.

The PIC unless you have an added 'filesystem' like an SD card attached, does not have a filesystem available/involved. Hence no fwrite type functions....
Koska



Joined: 05 Dec 2014
Posts: 3

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PostPosted: Mon Dec 22, 2014 6:29 am     Reply with quote
Ok. Thank you for your answers and recommendations.
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