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NIOS : fopen command only works if using the NIOSII Debug tool

VCham
New Contributor I
710 Views

I am trying to read a file using NIOS with the eventual goal of loading that readdata into an EEPROM.

 

I have followed the instructions outlined in : https://www.intel.com/content/www/us/en/programmable/documentation/mwh1416947091611.html

 

I have gone to the BSP editor -> Software Packages and enabled altera_hostfs. The hostfs_name is /mnt/host

 

My code (included below) gets stuck at fopen but if I use the NIOSII debugger, I am able to step through the whole program and readout "Hello World" into the console. Any suggestions would be appreciated.

 

#include <stdio.h>

#include <alt_types.h>

#include <io.h>

#include <string.h>

#include <stdlib.h>

#include <unistd.h>

#define BUF_SIZE (12)

void main()

{

FILE* fp;

char buffer[BUF_SIZE];

 

printf("start\n");

fp = fopen("/mnt/host/read_test.txt", "r");

printf("fopen command\n");

if (fp == NULL)

{

printf ("connot open file for reading\n");

exit(1);

}

fread(buffer, BUF_SIZE, 1, fp);

fclose(fp);

printf("%s", buffer);

}

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Ahmed_H_Intel1
Employee
454 Views

Hi,

I see the following reference is useful for you, please let me know if it isn't useful:

https://fpgacloud.intel.com/devstore/platform/18.0.0/Standard/generic-serial-flash-interface-intel-fpga-ip-core-reference-design/

BTW, please make sure you flush the cash to be able to see the output.

Regards,

 

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VCham
New Contributor I
454 Views

It was confirmed by an FAE that fopen will only work while using the Debug tool.

 

Thanks anyway.

Ahmed_H_Intel1
Employee
454 Views

Thanks Valentina for your confirmation, Please let me know if you need help.

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