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Altera_Forum's avatar
Altera_Forum
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16 years ago

test sram in nios ok,but sram can not be program memory

Hi everyone!

I have a test program for sram like as follows:

alt_u16 *temp=SRAM_16BIT_512K_BASE;

alt_u16 i=0;

alt_u16 data[100];

int main(void)

{

for(i=100;i<200;i++)

{

*(temp+i)=i;

}

temp=SRAM_16BIT_512K_BASE;

for(i=100;i<200;i++)

{

data=*(temp+i);

}

for(i=100;i<200;i++)

{

printf("data[%d]==%d\n",i,data);

}

while(1)

{}

return 1;

}

SRAM_16BIT_512K_BASE =0x80000

It is the address about sram in nios-system,

The result show me that write sram and read sram is ok.

I have also test it in debug module ,with step-in module I can see that memory of sram have been writeen ok.

But when I set sram as program memory ,there are something wrong about it.

Wrong information is :verified 0x80000 and 0x81f70 failed when I run it!

So i wish someone can help me!!:confused:

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  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    Just for your information, your code may not actually test your sram. The Nios CPU has a data cache, and with only 100 16-bit accesses, it is probably all kept in the cache.

    In order to actually test the SRAM, you would need to either use the alt_remap_uncached() function to define your temp pointer, or use the IORD/WR macros to read/write the memory.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    Yes,now when my program is little,nios download ok and there is no verify failed infomation ,but the program can not run in it.

    Because in the program I use "printf()" function printf a "Hello!"information to ide_console.

    So do you have some advice to me?