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VViro's avatar
VViro
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7 years ago
Solved

Nios - II memory alignment issue while accessing integer from non word align location

Error Msg : Not getting any error message but getting unexpected behavior - Using Nios-II with eclipse. While accessing integer(32 bit) form non word align location getting incorrect value as descri...
  • AnandRaj_S_Intel's avatar
    AnandRaj_S_Intel
    7 years ago

    Hi Vasu,

    Try by going to the project folders > right-click > properties> Nios II Application properties >

    Debug Level = 2

    Optimization Level =2

    This gives the required output

    Best Regards,

    Anand Raj Shankar

    (This message was posted on behalf of Intel Corporation)

    ​

VViro's avatar
VViro
Icon for New Contributor rankNew Contributor
7 years ago

Hi Anand,

We have tried using Quartus 18 and at first sight we got expected result. But when we checked for memory address of C[2] it was already word aligned, so it was expected behavior. Can you please check below program with your system?

char c[10] = {0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88};

printf("int starting c[0] = 0x%08x and address = 0x%08x\n", *(int*)(&c[0]), (int)&c[0]);

printf("int starting c[2] = 0x%08x and address = 0x%08x\n", *(int*)(&c[2]), (int)&c[2]);

// We are expecting following output:

// int starting c[0] = 0x44332211 and address = .....

// int starting c[2] = 0x66554433 and address = .....

Thanks,

Vasu.