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euem789's avatar
euem789
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5 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


In the BSP Editor, under Software Packages, remember to enter /mnt/host in altera_hostfs->hostfs_name.


Thanks.


Eric


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

    Appreciate for your reply again, Eric

    I'm using JTAG-UART (USB -blaster)

    and here is my Qsys diagram

    Actually my final goal is performing 'edge dectection' with binary or hex file through FPGA board. That's why I was finding a way to read the file.

    BTW, I found there are some ways to read file including the Host-Based-file system you mentioned, and I heard that it is only able to do in debuging mode....

    thanks for reading