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Altera_Forum
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19 years ago

Using IORD - IOWR

Hi,

I want to write down some value to my control register. Here are the steps :

1. Define component's macros which are done in SOPC Builder

# define MY_IORD(base , offset) IORD(base , offset)# define MY_IOWR(base , offset , data) IOWR(base , offset , data)

2. Use in NIOS IDE

MY_IOWR(base , 0 , 0x1);

return_value = MY_IORD(base , 0);

--------------------------

After execution , I learnt that my return_value is 0 instead of 1.

Why do I get this error ?

My reference : "n2sw_nii5v2.pdf" , pg 131/242

Thanks in advance,

Quan

5 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    19 years ago

    set PIO DIR ?

    # define inport(base) IORD(base, 0) # define outport(base, data) IOWR(base, 0, data)# define get_pio_dir(base) IORD(base, 1) # define set_pio_dir(base, data) IOWR(base, 1, data)
  • Altera_Forum's avatar
    Altera_Forum
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    19 years ago

    Hi Slacker ,

    I have a component and try to control it through the NIOS C program. I have been trying to write to a control register that I defined for my component.

    For ex : I have a counter. Here are the files I have to make :

    (1) Hardware files

    counter_task_logic.v

    counter_regs.v

    counter_avalon_interface.v

    (2) Software files

    counter_regs.h (/inc)

    counter_routines.h (/HAL/inc)

    counter_routines.c (/HAL/src)

    (3) Test Hardware file

    counter_test.c

    Then I packaged my counter to SOPC with (1) and (2) and used NIOS IDE to create program to check my counter.

    I tried to follow the instruction in the reference I gave you some days ago but it seemed to me that it didn't work as I expected.

    Could you tell me where my problem is ?

    Thanks,

    Quan
  • Altera_Forum's avatar
    Altera_Forum
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    19 years ago

    Hi makasete,

    Sorry , It is not very clear about your idea.

    Would you please tell me about it more clearly?

    Thank you so much,

    Quan
  • Altera_Forum's avatar
    Altera_Forum
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    19 years ago

    --- Quote Start ---

    originally posted by quan1328@Jul 14 2006, 05:43 PM

    could you tell me where my problem is ?

    thanks,

    quan

    <div align='right'><{post_snapback}> (index.php?act=findpost&pid=16922)

    --- quote end ---

    --- Quote End ---

    Perhaps, an error in your hardware design? Why don&#39;t you run a simulation and see what&#39;s happening in your hardware?

    Other than that, I don&#39;t have enough visibility into what you&#39;re trying to do to help you any further.

    Good luck!

    - slacker