CCS/TMS320F28335: Unable to open/read a .csv file

Jose De Casas

Part Number: TMS320F28335

Tool/software: Code Composer Studio

Hello,

I am having difficulty figuring out why fopen does not allow me to open the file. When I debug it won't reach the if statement and currently doesn't let me set a breakpoint at the fopen line. I tested my code in MVS and it works fine.

I only get two warnings:

#10247-D null: creating output section ".cio" without a SECTIONS specification Test C/C++ Problem
#10247-D null: creating output section "ramfuncs" without a SECTIONS specification Test C/C++ Problem

#include "DSP28x_Project.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void main(void)
{
    DisableDog();
    FILE *outfile = fopen("test.csv", "r");
    if (outfile != NULL) {
        exit(1);
    }
    char data[52][100];
    fgets(data[0], 100, outfile);
    fclose(outfile);

}

Thanks in advance,

Jose

over 6 years ago

0 George Mock over 6 years ago

TI__Guru**** 250410 points

These warnings ...

Jose De Casas said:
#10247-D null: creating output section ".cio" without a SECTIONS specification Test C/C++ Problem
#10247-D null: creating output section "ramfuncs" without a SECTIONS specification Test C/C++ Problem

... indicate you are not using the correct linker command file. As a workaround, add entries to the linker command file to put each of these output sections in a range of memory that can be both read and written. To understand more about why your linker command file is lacking, please start a new thread in the C2000 device forum. Or, if you prefer, I can move this thread to that forum.

That may not be your only problem. Please see the article Tips for Using Printf for more background and suggestions.

Thanks and regards,

-George

0 Jose De Casas over 6 years ago in reply to George Mock

Prodigy 250 points

I am currently using the 28335_RAM_lnk.cmd file. I am pretty new to all this, so how exactly would I add an entry like you have stated?

As for the tips, I changed the heap size to 0x100 and stack size to 0x300, but like I said before, I am unsure if this was the correct thing to do. I wasn't sure what was the proper way to set a correct size. In addition, I also put the optimization level to "Whole Program Optimizations".

I think I figured out how to add the entries:

SECTIONS
{
   /* Setup for "boot to SARAM" mode:
      The codestart section (found in DSP28_CodeStartBranch.asm)
      re-directs execution to the start of user code.  */
   codestart        : > BEGIN,     PAGE = 0
   
#ifdef __TI_COMPILER_VERSION__
   #if __TI_COMPILER_VERSION__ >= 15009000
    .TI.ramfunc : {} > RAML0,      PAGE = 0
   #else
   ramfuncs         : > RAML0,     PAGE = 0   
   #endif
#endif    
   
   .text            : > RAML1,     PAGE = 0
   .cinit           : > RAML0,     PAGE = 0
   .pinit           : > RAML0,     PAGE = 0
   .switch          : > RAML0,     PAGE = 0
   .cio		    : > RAML0,	   PAGE = 0 //I added this line
   ramfuncs	    : > RAML0,	   PAGE = 0 //I added this line

   .stack           : > RAMM1,     PAGE = 1
   .ebss            : > RAML4,     PAGE = 1
   .econst          : > RAML5,     PAGE = 1
   .esysmem         : > RAMM1,     PAGE = 1

   IQmath           : > RAML1,     PAGE = 0
   IQmathTables     : > IQTABLES,  PAGE = 0, TYPE = NOLOAD

It made the warnings go away, but the same issue as before.

Thanks for your help,

Jose

0 Jose De Casas over 6 years ago in reply to Jose De Casas

Prodigy 250 points

Another thing I noticed, was that if I comment out the fgets function, the file is able to open with no error.

Also, when I step into fopen, I reach this:

***********************************************************************
* Function: codestart section
*
* Description: Branch to code starting point
***********************************************************************

    .sect "codestart"

code_start:
    .if WD_DISABLE == 1
        LB wd_disable       ;Branch to watchdog disable code //this line of code. And it loops from here and back to fopen.
    .else
        LB _c_int00         ;Branch to start of boot.asm in RTS library
    .endif

0 George Mock over 6 years ago

TI__Guru**** 250410 points

I just noticed this line in the main function ...

Jose De Casas said:
char data[52][100];

That line alone takes up 5200 words of stack. This means you overflow the stack by a lot. Make that a global variable. Then your program probably won't link, and you will have to make that array smaller.

If that doesn't fix the problem, I suggest you simplify your program a lot. Try getting this program to work ...

#include <stdio.h>
int main() { puts("Hello, world!"); }

Thanks and regards,

-George

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CCS/TMS320F28335: Unable to open/read a .csv file