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Altera_Forum's avatar
Altera_Forum
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12 years ago

Interrupt Problem over HLGPI

Hello,

I'm very new in developing with Cyclone V SoC and have big problems to recognize an interrupt send from a Button to the HPS.

What I have done so far:

1. Initiate the HPS System with Qsys (enable HLGPI interface)

2. compiled the project with quartus and load the fpga and boot YOCTO Linux

3. I have pushed the button and read out the interrupt with "./devmem2 0x70a000" ( I have checked all 16 bits) but i only got the result 0x00000000

What am I doing wrong?

This is very frustrating.

I appreciate any help

3 Replies

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

    Hello,

    Try reading "./devmem2 0x70a050". That worked for me, but I still can't figure out why reading "./devmem2 0x70a000" (previusly I had set the bits to INPUT) only gives me 0x0.

    "./devmem2 0x70a050" is the GPIO2_EXP_PORTA

    Regards!
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    I want to find out, which gpio pin is used for 0xff70a50 under /sys/class/gpio.

    The Documentation "Cortex-A9 Microprozessor Unit Subsystem" says Pin 198 (Table 6-2).

    But I don't think so.

    Does anyone know the answer?