Help:Cann't read or write EPCS in Nios II,why?

hi everybody,

iam using a nios II system generated from sopc builder.my system contains

a CFI FLASH and SDRAM.Iam trying to simulate THE MEMTESTC.C exemple from the IDE.the sdram test is allright but the flash test is not.

I have an error in Modelsim "

-ERROR: Could not open flash

i think that the problem is in the function

alt_flash_open_dev witch don't recognize the flash

i changed the code a little bit to be a ble to simulate

static void TestFlash(int mode, int flash_type)

{

alt_flash_fd* fd;

int number_of_regions;

int block;

int y=0;

flash_region* regions;

int ret_code = 0x0;

// alt_u8 entry[4];

alt_u8 flashname[30];i replace this variable by CFI_FLASH_NAME

printf("\n get flash name\n");

ret_code = GetFlashName(CFI_FLASH_NAME,CFI);

printf("\n openning the falsh\n");

fd = alt_flash_open_dev(CFI_FLASH_NAME);

if (fd)

{

printf(" -Successfully opened %s\n", CFI_FLASH_NAME);

/* Get some useful info about the flash */

ret_code = alt_get_flash_info(fd, &regions, &number_of_regions);

if (!ret_code)

{

printf(" -Region 0 contains %d blocks.\n", regions->number_of_blocks);

block = FlashFindErasedBlocks(fd, regions, number_of_regions, mode);

/* If we're in TEST mode, ask if this block is okay to test. */

if(( mode == TEST ) && ( block != QUIT_WITHOUT_TESTING ))

{

printf(" -Block %d, at address 0x%X identified.\n", block, (regions->offset + (block * regions->block_size)));

printf(" -Would you like to test this block? (y/n)");

//GetInputString(entry, sizeof(entry), stdin);

y=1;

// if ( entry[0] == 'y' && entry[1] == '\n' )

if(y==1)

{

/* Test that Flash! */

FlashRunTests(fd, block, regions);

printf(" -Closing flash device \"%s\".\n",CFI_FLASH_NAME);

alt_flash_close_dev(fd);

}

}

}

}

else

{

printf(" -ERROR: Could not open %s\n", CFI_FLASH_NAME);

}

}

i tried a lot of things and i get the same result

if somebody have an idea about how to solve this problem please HELP ME

hi,

sometimes, it can be opened, but it often can not be opened. i don't know why.

hi,

how about the ext_flash? it's the same problem.

hi,

thanks very much, mike21, it's perfect!

Hi,

include these files also,

#include "altera_avalon_epcs_flash_controller.h"

#include "sys/alt_flash.h"// used for EPCS

#include "sys/alt_flash_dev.h"// used for EPCS# include "sys/alt_sys_init.h"

you need to open the device using the name of the EPCS device, with the value stored in the system.h file, like below

// open flash device

pEPCS = alt_flash_open_dev(EPCS_CONTROLLER_NAME);

this is what is located in the generated system.h header,

#define epcs_controller_name"/dev/epcs_controller"

Is your flash (EPCS) empty? Try downloading your program to flash, then try to debug it again. I had the same problem. If the flash was empty, it would not open the EPCS device correctly.

Let me know if this was the case,

Mike