Unable to refer to functions in lv_qrcode.h from Zephyr

[alendmw]

Hey folks,

I am trying to use the lv_qrcode library with my Zephyr Nordic nRFConnect project.

I keep getting CMake build errors such as below when I try access functions from lv_qrcode.h in my application.

complete/CMakeLists.txt

In function ‘qrcode_scr_lvgl_create’: [build] /workspaces/app_nrf_fw/src/graphic_manager/qrcode_screen.c:87:9: error: implicit declaration of function ‘lv_qrcode_create’; did you mean ‘lv_group_create’? [-Werror=implicit-function-declaration] [build] 87 | lv_qrcode_create( qrcode_screen, QRCODE_DIMENSION_PIXELS, lv_color_hex3( LV_COLOR_HEX3_DARKEST ), lv_color_hex3( LV_COLOR_HEX3_LIGHTEST ) ); [build] | ^~~~~~~~~~~~~~~~ [build] | lv_group_create [build] /workspaces/app_nrf_fw/src/graphic_manager/qrcode_screen.c:86:12: error: assignment to ‘lv_obj_t *’ {aka ‘struct _lv_obj_t *’} from ‘int’ makes pointer from integer without a cast [-Werror=int-conversion] [build] 86 | qr_obj = [build] | ^

This is the CMake file I am working with./cfs-file/__key/communityserver-components-multipleuploadfilemanager/c0c5a53f_2D00_52b8_2D00_4c7e_2D00_9422_2D00_535ad2ea53f0-130336-

I see that lv_qrcode.c is included in https://github.com/zephyrproject-rtos/zephyr/blob/main/modules/lvgl/CMakeLists.txt

And this is in my prj.conf

# LVGL

CONFIG_LVGL=y

CONFIG_LV_CONF_MINIMAL=y
CONFIG_LV_Z_BITS_PER_PIXEL=1

CONFIG_LV_Z_VDB_SIZE=100

CONFIG_LV_MEM_CUSTOM=y

CONFIG_LV_Z_MEM_POOL_NUMBER_BLOCKS=3

CONFIG_LV_COLOR_DEPTH_1=y

CONFIG_LV_USE_LABEL=y

CONFIG_LV_USE_IMG=y

CONFIG_LV_USE_QRCODE=y C

ONFIG_LV_USE_CANVAS=y

I also see this line in my build log:

 [build] [265/448 58% :: 2.346] Building C object modules/lvgl/CMakeFiles/modules__lvgl.dir/workdir/nrfconnect/modules/lib/gui/lvgl/src/extra/libs/qrcode/lv_qrcode.c.o

Any and all tips would be appreciated! Thank you

[Naeem Maroof]

Hi Alen,

Thank you for contacting DevZone at NordicSemi.

I cannot see the CmakeLists file you have attached.

Nonetheless, I just copied the project configs you have pasted here.

I started with the LVGL sample in NCS 2.5.0, added your configs to the prj.conf,

and then modified the main.c to use the function you have mentioned. 

I was able to compile it well. I built it for the nrf52840dk_nrf52840 with the AdaFruit 2.8 inch shield.

Just attaching the complete zip for reference. 

lvgl.rar

With regards,

Naeem

[alendmw]

Hey Naeem Maroof I will give that a try, in the meantime this is my CMakeLists.txt

Fullscreen 3582.CMakeLists.txt Download

add_library(graphic_manager STATIC)
add_library(app::graphic_manager ALIAS graphic_manager)

target_sources(graphic_manager
    PRIVATE
    include/graphic_manager.h
    include/intro_screen.h
    include/qrcode_screen.h
    include/default_screen.h

    graphic_manager.c
    intro_screen.c
    qrcode_screen.c
    default_screen.c
)
FILE(GLOB font_sources assets/fonts/*.c)
target_sources(app PRIVATE ${font_sources})

FILE(GLOB img_sources assets/images/*.c)
target_sources(app PRIVATE ${img_sources})

target_include_directories(graphic_manager
    PUBLIC
    include
    PRIVATE

    ${ZEPHYR_BASE}/../modules/lib/gui/lvgl
    ${ZEPHYR_BASE}/modules/lvgl
)

target_compile_options(graphic_manager
    PRIVATE
)

target_link_libraries(graphic_manager
    PUBLIC
    app::config
    app::blackboard
    app::event_manager
    zephyr
)

[alendmw]

Thank you for your support Naeem Maroof . It turns out another team member had introduced a .conf file for a specific build which I didnt know about - and I was missing the .conf flag to include the LV QR code features.