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CAlex's avatar
CAlex
Icon for Contributor rankContributor
3 years ago

How to setup a time interrupt on de10 standard using C language

Hi, I'm a rookie of the SoCFPGA and I wanted to use it to build a FSM in HPS.
I have already finished building the system design as "User Manu" said and get the hps_0.h header file out.
I built my system based on the GHRD, and added a timer(100ms) using the Altera IP.
Now I want to play with it,yet there are little information about a timer or an interrupt working on SOC.
The board I'm using is a DE10-standard board.
Could anyone show me where to start?
And it will be better if you can provide a document/example on how to play with the Altera IP on C.
Thank you for your help.

36 Replies

  • tehjingy_Altera's avatar
    tehjingy_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    Hi


    Sorry to inform you that, I am taking annual leave next week.

    Please expect some delay in my reply.


    Thank you very much in advance!


    Regards

    Jingyang, Teh


    • CAlex's avatar
      CAlex
      Icon for Contributor rankContributor
      3 years ago

      Hi, there

      I linked the IRQ signal from the timer to the HPS and mmBridge like GHRD did to their button PIO ips.

      Downloaded and ran the fpga design on my board and it turns out worked well.

      So I believe the hardware part is done for now.

      The issue is on software, I tried to figure out how to request, call and disable an IRQ through C,and I finished reading through the MPU part in Cyclone V handbook and IP handbook for Altera.

      It terns out to be little helpful.

      Now I'm reading the .dts file from the GHRD and the following is the capture of the button ip.

      Also I found some information on hps_0.h, it's a define of an irq id as figuer 2 discribed.

      But other than that I don't know what to do next.

      Here are my list of questions:

      1. I uploaded the fpga design to my board through the JTAG port and worked well(I made the led blink), is that mean the hardware design is done?

      2.On softwware design, what should I do next?

      3.When I used the Altera IP, I usually don't know how to link the parts, for example: there is a timer ip,thimer------->mmBridge------>f2h_bridge ,and I linked it to the fpga_only bridge, but I don't know why I need to link to these bridges, do you guys have any explination doc or turtour resources for qsys?

      that's all, thanks for your reply BTW.

      reguards.

  • CAlex's avatar
    CAlex
    Icon for Contributor rankContributor
    3 years ago

    Hi

    Another issue occurred:

    I include the <alt_interrupt.h> and trying to make the file,

    and the error information:Error: Thumb encoding does not support an immediate here -- `msr CPSR_c,#(0x12|0x80|0x40)' occurred.

    I read the src code and that appears related to

    alt_int_fixup_irq_stack(uint32_t stack_irq) function
    Yet I didn't call that function.

    What's that error means and most importantly how can I fix that?

    reguards.

    • CAlex's avatar
      CAlex
      Icon for Contributor rankContributor
      3 years ago

      Sure.

      BTW, I put the alt_interrupt.c in my file so that only this .c file is linked.

  • tehjingy_Altera's avatar
    tehjingy_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    Hi Alex


    Could you share me the make file that you are using?

    I could not find any info regarding the error message.

    Are you able to compile and run a simple hello world application?


    Regards

    Jingyang, Teh


  • CAlex's avatar
    CAlex
    Icon for Contributor rankContributor
    2 years ago

    Hi,

    thank you for your reply.

    The attached is the makefile I use.

    And yes I can compile and run the application if I don't use any of <alt_interrupt.h> related libs.

    Could please you tell me more about the FPGA IRQ to HPS?

    I built the system of a timer(100ms with)-->Avalon mm bridge -->f2h lw bridge

    with the irq---(0)--->f2h IRQ so the irq should be 72 in GIC.

    I wrote a C code to use mmap to map the timer through the avalon and tryed to control it with (pTimer +1)which is the register of (start,stop,cont,ITO)

    I also put the .dtb file and .sof file into the board but now I'm get a little confused. Here is the questions I have:

    1. Do I need to do the preload settings for this change? or can I just change the FPGA fabric since I didn't change the HPS design.

    2. Do I need to write the kernal module to make the IRQ registered?

    3. How can I register the interrupts ?

    4.What kind of environment do I need to use the hwlib for Altera soft IP and HPS hard core IP(I assume the <alt_interrupt.h>is a HPS hard core IP lib).

    And thank you for kind help.

    I appreciate that.

    reguards.

  • tehjingy_Altera's avatar
    tehjingy_Altera
    Icon for Regular Contributor rankRegular Contributor
    2 years ago

    Hi CAlex


    Sorry for the late reply.

    Could you change to line 10 of the make files to the line below:

    CFLAGS = -g -Wall -D$(ALT_DEVICE_FAMILY) --include-dir=$(HWLIBS_ROOT)/include/$(ALT_DEVICE_FAMILY) --include-dir=$(HWLIBS_ROOT)/include/


    For the F2H interrupt, all the interrupts for F2H0 starts from 72 and F2H1 starts from 104.

    The number you see in platform designer will be the offset from the start number base on which F2H controller it is connected.

    E.g.:

    In the GHRD.

    The interrupt number for the dipsw _pio will be (72 +0)

    The interrupt number for the button_pio will be (72 +1)

    The interrupt number for the jtag_uartwill be (72 +2)


    I checked from my colleague there is no need to change the linux device tree or create a linux module for the interrupt.

    The important thing is getting the interrupt number.

    With the interrupt number you can register a callback to the interrupt number.


    Regards

    Jingyang, Teh




    • CAlex's avatar
      CAlex
      Icon for Contributor rankContributor
      2 years ago

      Hi,

      Thank you for the reply,

      I tried your suggestion and the makefile was changed as below:

      And the EDS gave me the error said unrecognize the command line option --include-dir=

      reguards

      • CAlex's avatar
        CAlex
        Icon for Contributor rankContributor
        2 years ago

        And another question is : do I need to write a linux module that request and free an irq

  • tehjingy_Altera's avatar
    tehjingy_Altera
    Icon for Regular Contributor rankRegular Contributor
    2 years ago

    Hi Alex


    In the c program, we will be using the Hwlibs.

    It is a set a library for you to access the hardware using apis.

    https://www.rocketboards.org/foswiki/Documentation/HWLib#SoC_Abstraction_Layer_40SoCAL_41


    You could find the list of API and its description here:

    https://www.rocketboards.org/foswiki/pub/Documentation/HWLib/hwlib_api.tar.gz


    Once you have the hwlibs installed. You could refer to the example.

    In the example you will need to include the related header files and you could access the hardware and register.

    e.g.

    #include "alt_interrupt.h"

    #include "alt_timers.h"


    Regards

    Jingyang, Teh


    • CAlex's avatar
      CAlex
      Icon for Contributor rankContributor
      2 years ago

      Hi,

      Thank you for the help.

      I was informed that Linux can't use alt_interrupt.h , it only serve the bare metal invironment.

      Now I'm trying to learn how to get an irq server in Linux system.

      Could you find any resources for the De10 board?

      Any way, Thank you for the help again.

      reguards