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[FAQ] PROCESSOR-SDK-DRA8X-TDA4X: [PSDKRA]Can I use QT & wayland to render VisionApp result?

user4836286
Expert 1300 points

Part Number: PROCESSOR-SDK-DRA8X-TDA4X

Hello

Could you guide how to use QT & wayland in VissionApp?

Thanks in advance,

Wilson.

  • 0
    TI__Guru** 113810 points

    There is some issue with the system - test reply to see if I can post a response.

  • 0 in reply to Karthik Ramanan
    TI__Guru** 113810 points

    Posting a response from my colleague Kedar:

    To enable disaplay on A72 do the following: 

    1. Disable display in R5F/OpenVX, https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/latest/exports/docs/vision_apps/docs/user_guide/BUILD_INSTRUCTIONS.html#MAKEFILE_OPTIONS
      #undef ENABLE_DSS, ENABLE_DSS_HDMI , ENABLE_DSS_EDP in ${PSDKRA}/vision_apps/apps/basic_demos/app_tirtos/common/app_cfg_mcu2_0.h, see above link for more details
    2. Rebuild vision_apps and update binaries as usual, https://software-dl.ti.com/jacinto7/esd/processor-sdk-rtos-jacinto7/latest/exports/docs/vision_apps/docs/user_guide/BUILD_AND_RUN.html
    3. Make sure OpenVX display node is not used in your application (By default vision_apps demos with OpenVX display node, so these should not be used or modified accordingly)
    4. Enable display on Linux side by modifying vision_apps dtso as below, remove below lines from arch/arm64/boot/dts/ti/k3-j721e-vision-apps.dtso in linux kernel in PSDKLA. Regenerate the dtbo for the modified dtso and apply it during boot.
    5. &serdes_wiz4 {

               status = "disabled";

};

&mhdp {

               status = "disabled";

};

&dss {

               status = "disabled";

};

&main_i2c1 {

               status = "disabled";

};

    6. When display is disabled from R5F/OpenVX and enabled in linux kernel via dtbo change above, you should see linux prompt or a splash screen on a wayland display when you boot linux. You can use the usual wayland/DRM APIs to draw to this display.

     

    Regards

    Kedar

  • 0 in reply to Karthik Ramanan
    Expert 1300 points

    Hi Kedar,

    Thanks for detail guide.

    I can run wayland with DP direct connection, but DP to HDMI convert is not working.

    In RTOS display mode, Board_setHDMIMux() & Board_setHDMIPdHigh() solved DP to HDMI issue. What is equivalent function in Linux?

    Thanks and regards,

    Wilson.

  • 0 in reply to user4836286
    TI__Guru**** 451355 points

    Hi Wilson,

    In order to enable DP to HDMI adapter, we need to set pin0 to level high on io expander (i2c addr 0x20) available on i2c instance 1. I think even if we are able to set it from application, just once, it should be fine. 

    I am trying to see if "i2cset" utility can be used for it. I am checking it and will get back to you as soon as possible. 

    Regards,

    Brijesh

  • 0 in reply to Brijesh Jadav
    TI__Guru**** 451355 points

    Hi Wilson,

    Since the same the i2c instance is also being used for the other clients, for example, it is also used for configuring board muxes for ethernet firmware, i would suggest to get it configured by the mcu r5f firmware itself.. 

    Regards,

    Brijesh

  • 0 in reply to Brijesh Jadav
    Expert 1300 points

    Brijesh,

    Thanks for keep attention. My problem was on D3's RVP board and solved. Linux SYSFS provides simple GPIO control interface. 

    DP power can be enabled in RVP by "echo 460 > /sys/class/gpio/export; echo "out" > /sys/class/gpio/gpio460/direction; echo 1 > /sys/class/gpio/gpio460/value".

    I guess EVM also can be controlled similarly. 

    You can close this post.

    Thanks and regards,

    Wilson.

  • 0 in reply to user4836286
    TI__Guru**** 451355 points

    On J721S2, addition to disabling SERDES, please also disable i2c4 in the k3-j721s2-rtos-memory-map.dtsi file, as shown below.

    &main_i2c1 {

        status = "disabled";

    };

     

    /*

    &main_i2c4 {

               status = "disabled";

    };

    */

     

    &main_i2c5 {

               status = "disabled";

    };

     

    /*

    &serdes_wiz0 {

        status = "disabled";

    };

    */

    Regards,

    Brijesh