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euem789's avatar
euem789
Icon for New Contributor rankNew Contributor
6 years ago
Solved

file io with NIOS II

Hi all I wrote a code to read the text file for implementing in FPGA board (DE1-SOC) with NIOS II , but when I build the project, the elf file wasn't generated. here's my code ----------...
  • EricMunYew_C_Intel's avatar
    EricMunYew_C_Intel
    5 years ago

    Hi, Dong Wook


    You are right.


    However, there is another way, ie using a character-mode device like UART.


    Below example is to write characters to a UART called uart1. You can find the device name (/dev/uart1) in the system.h

    #include <stdio.h>

    #include <string.h>


    int main (void)

    {

    char* msg = "hello world";

    FILE* fp;

    fp = fopen ("/dev/uart1", "w");

    if (fp!=NULL) { fprintf(fp, "%s",msg); fclose (fp);}

    return 0;

    }


    Thanks.


    Eric










EricMunYew_C_Intel's avatar
EricMunYew_C_Intel
Icon for Frequent Contributor rankFrequent Contributor
5 years ago

Hi, Dong Wook


Can you forward your error log or picture to me ?


Thanks.


Eric


  • euem789's avatar
    euem789
    Icon for New Contributor rankNew Contributor
    5 years ago

    Appreciate for your reply Eric!

    When I compiled , it said there was only an error with making elf file and others were fine.

    Anyway, I solved the problem with elf file by increasing the amount of On-chip-memory.

    but this time I faced another problem.... (reading file)

    compile is enable and also able to run with hardware,

    but the result is not what I wanted. ( with file path in eclipse I guess)

    here's the code and also the console picture with it

    #include <stdio.h>

int main()
{
   int num;
   FILE *fptr;

   if ((fptr = fopen("C:\\test_num.txt","r")) == NULL){
       printf("Error! opening file");
       return 0;
   }

   fscanf(fptr,"%d", &num);

   printf("Value of n=%d", num);
   fclose(fptr);

   return 0;
}

    I'm wondering what's wrong this time, and also am I doing right...

    thanks for reading