NIOS II C language about SDRAM IOWR & IORD function and fopen & fclose

Hi teddy,

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p = fopen("C:\test1.txt", "w");

fprintf(fp, "%d", output_data);

fclose(fp);

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Akira is right. You need a filesystem for that.

But as Cris mentioned, I am also concerned about the IOWR/IORD-part.

If I got you right, you want to write input_data to some SDRAM-address and read it back for printing it.

First: I would let the compiler allocate memory for you, unless you know what is at the specified address. You can use malloc or something like that or you just declare a variable.

For example (assumed that data region is located at SDRAM):

#include <stdio.h># include <unistd.h># include "system.h"
int input_data = 1;
int output_data = 0;
int output_data_read = 0;
int main()
{
    IOWR(&output_data,0,input_data); // write input_data to output_data with IOWR
    output_data_read = IORD(&output_data,0); // read it back from output_data to output_data_read
    printf("output data = %d\n", output_data_read); // printing on STDOUT
   return 0;
}

Second: I would usually use IOWR/IORD only in cases where it can be neccessary. Like bypassing the data cache. Otherwise, better use standard C-coding for accessing memory.

Regards,

Philipp