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Jacob11's avatar
Jacob11
Icon for Occasional Contributor rankOccasional Contributor
4 years ago
Solved

Nios II PIO Stimulus input signals for simulation with Modelsim/questasim

Hi guys, It is my first post, so apologies if I leave out something important. I have created a very simple Nios II environment with 2 buttons button as a PIO input width 2, and leds as a PIO o...
  • Jacob11's avatar
    Jacob11
    4 years ago

    Hello Sheng. Thank you for the response.

    I solved it. The code is fine, but providing stimulus signals needs to be done in modelsim with the FORCE command.

    http://www.pldworld.com/_hdl/2/_ref/se_html/manual_html/c_vcmds87.html

    I was able to create a macro file(.do) which switches this stimulus repeatedly during the simulation.

    Thank you,

    Jacob

ShengN_altera's avatar
ShengN_altera
Icon for Super Contributor rankSuper Contributor
4 years ago

Hi,


Probably something is missing in the while loop.

while (1)

{

btn_in = ~IORD_ALTERA_AVALON_PIO_DATA(BUTTON_BASE);

led_pattern = ~led_pattern; //invert led_pattern

btn_in &= led_pattern;

IOWR_ALTERA_AVALON_PIO_DATA(LED_BASE,btn_in); //macro which writes led_pattern to the LED_BASE memory address

}


Best Regards,

Sheng

p/s: If any answer from community or Intel support are helpful, please feel free to mark as solution and give Kudos.


Jacob11's avatar
Jacob11
Icon for Occasional Contributor rankOccasional Contributor
4 years ago

Hello Sheng. Thank you for the response.

I solved it. The code is fine, but providing stimulus signals needs to be done in modelsim with the FORCE command.

http://www.pldworld.com/_hdl/2/_ref/se_html/manual_html/c_vcmds87.html

I was able to create a macro file(.do) which switches this stimulus repeatedly during the simulation.

Thank you,

Jacob