gui: Added glue logic for LittlevGL GUI library
Added glue logic to interface Zephyr with LittlevGL GUI library
This includes:
* KConfig options for all lvgl options
* Kernel & user space memory management
* Zephyr to lvgl FS call mapping
* Color space conversion function
Signed-off-by: Jan Van Winkel <jan.van_winkel@dxplore.eu>
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index e0f4446..2e42a63 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -12,3 +12,4 @@
add_subdirectory_ifdef(CONFIG_CMSIS_RTOS_V1 cmsis_rtos_v1)
add_subdirectory_ifdef(CONFIG_CMSIS_RTOS_V2 cmsis_rtos_v2)
add_subdirectory(rbtree)
+add_subdirectory(gui)
diff --git a/lib/Kconfig b/lib/Kconfig
index 01c885f..6861a2c 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -30,4 +30,7 @@
source "lib/cmsis_rtos_v1/Kconfig"
source "lib/cmsis_rtos_v2/Kconfig"
+
+source "lib/gui/Kconfig"
+
endmenu
diff --git a/lib/gui/CMakeLists.txt b/lib/gui/CMakeLists.txt
new file mode 100644
index 0000000..51eaded
--- /dev/null
+++ b/lib/gui/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory_if_kconfig(lvgl)
diff --git a/lib/gui/Kconfig b/lib/gui/Kconfig
new file mode 100644
index 0000000..e161852
--- /dev/null
+++ b/lib/gui/Kconfig
@@ -0,0 +1,11 @@
+#
+# Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+menu "Graphical user interface"
+
+rsource "lvgl/Kconfig"
+
+endmenu
diff --git a/lib/gui/lvgl/CMakeLists.txt b/lib/gui/lvgl/CMakeLists.txt
new file mode 100644
index 0000000..9c4f84c
--- /dev/null
+++ b/lib/gui/lvgl/CMakeLists.txt
@@ -0,0 +1,175 @@
+include(FetchContent)
+
+set(lv_name lvgl)
+
+set(ep_base ${PROJECT_BINARY_DIR}/ext_proj)
+set_property(DIRECTORY PROPERTY "EP_BASE" ${ep_base})
+
+set(lv_SOURCE_DIR ${ep_base}/Source/${lv_name})
+set(lv_SUBBUILD_DIR ${ep_base}/Subbuild/${lv_name})
+
+FetchContent_Declare(
+ ${lv_name}
+ GIT_REPOSITORY https://github.com/littlevgl/lvgl.git
+ GIT_TAG v5.2
+ SOURCE_DIR ${lv_SOURCE_DIR}
+ BINARY_DIR ${lv_SOURCE_DIR}
+ SUBBUILD_DIR ${lv_SUBBUILD_DIR}
+)
+
+FetchContent_GetProperties(${lv_name})
+if(NOT ${lv_name}_POPULATED)
+ FetchContent_Populate(${lv_name})
+endif()
+
+zephyr_interface_library_named(lvgl)
+
+set(LVGL_SOURCE_DIR ${${lv_name}_SOURCE_DIR})
+
+target_include_directories(lvgl INTERFACE ${LVGL_SOURCE_DIR})
+target_include_directories(lvgl INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
+
+zephyr_compile_definitions(LV_CONF_INCLUDE_SIMPLE=1)
+
+zephyr_library()
+
+zephyr_library_sources(
+
+ ${LVGL_SOURCE_DIR}/lv_core/lv_group.c
+ ${LVGL_SOURCE_DIR}/lv_core/lv_indev.c
+ ${LVGL_SOURCE_DIR}/lv_core/lv_obj.c
+ ${LVGL_SOURCE_DIR}/lv_core/lv_refr.c
+ ${LVGL_SOURCE_DIR}/lv_core/lv_style.c
+ ${LVGL_SOURCE_DIR}/lv_core/lv_vdb.c
+
+ ${LVGL_SOURCE_DIR}/lv_draw/lv_draw.c
+ ${LVGL_SOURCE_DIR}/lv_draw/lv_draw_arc.c
+ ${LVGL_SOURCE_DIR}/lv_draw/lv_draw_img.c
+ ${LVGL_SOURCE_DIR}/lv_draw/lv_draw_label.c
+ ${LVGL_SOURCE_DIR}/lv_draw/lv_draw_line.c
+ ${LVGL_SOURCE_DIR}/lv_draw/lv_draw_rbasic.c
+ ${LVGL_SOURCE_DIR}/lv_draw/lv_draw_rect.c
+ ${LVGL_SOURCE_DIR}/lv_draw/lv_draw_triangle.c
+ ${LVGL_SOURCE_DIR}/lv_draw/lv_draw_vbasic.c
+
+ ${LVGL_SOURCE_DIR}/lv_hal/lv_hal_disp.c
+ ${LVGL_SOURCE_DIR}/lv_hal/lv_hal_indev.c
+ ${LVGL_SOURCE_DIR}/lv_hal/lv_hal_tick.c
+
+ ${LVGL_SOURCE_DIR}/lv_misc/lv_anim.c
+ ${LVGL_SOURCE_DIR}/lv_misc/lv_area.c
+ ${LVGL_SOURCE_DIR}/lv_misc/lv_circ.c
+ ${LVGL_SOURCE_DIR}/lv_misc/lv_color.c
+ ${LVGL_SOURCE_DIR}/lv_misc/lv_font.c
+ ${LVGL_SOURCE_DIR}/lv_misc/lv_fs.c
+ ${LVGL_SOURCE_DIR}/lv_misc/lv_ll.c
+ ${LVGL_SOURCE_DIR}/lv_misc/lv_log.c
+ ${LVGL_SOURCE_DIR}/lv_misc/lv_math.c
+ ${LVGL_SOURCE_DIR}/lv_misc/lv_mem.c
+ ${LVGL_SOURCE_DIR}/lv_misc/lv_task.c
+ ${LVGL_SOURCE_DIR}/lv_misc/lv_templ.c
+ ${LVGL_SOURCE_DIR}/lv_misc/lv_txt.c
+
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_arc.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_bar.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_btn.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_btnm.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_calendar.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_cb.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_chart.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_cont.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_ddlist.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_gauge.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_img.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_imgbtn.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_kb.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_label.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_led.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_line.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_list.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_lmeter.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_mbox.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_objx_templ.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_page.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_preload.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_roller.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_slider.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_sw.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_ta.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_tabview.c
+ ${LVGL_SOURCE_DIR}/lv_objx/lv_win.c
+
+ ${LVGL_SOURCE_DIR}/lv_themes/lv_theme.c
+ ${LVGL_SOURCE_DIR}/lv_themes/lv_theme_alien.c
+ ${LVGL_SOURCE_DIR}/lv_themes/lv_theme_default.c
+ ${LVGL_SOURCE_DIR}/lv_themes/lv_theme_material.c
+ ${LVGL_SOURCE_DIR}/lv_themes/lv_theme_mono.c
+ ${LVGL_SOURCE_DIR}/lv_themes/lv_theme_nemo.c
+ ${LVGL_SOURCE_DIR}/lv_themes/lv_theme_night.c
+ ${LVGL_SOURCE_DIR}/lv_themes/lv_theme_templ.c
+ ${LVGL_SOURCE_DIR}/lv_themes/lv_theme_zen.c
+
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_builtin.c
+)
+
+zephyr_library_sources_ifdef( CONFIG_LVGL_BUILD_IN_FONT_10
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_dejavu_10.c
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_dejavu_10_cyrillic.c
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_dejavu_10_latin_sup.c
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_symbol_10.c
+)
+
+zephyr_library_sources_ifdef( CONFIG_LVGL_BUILD_IN_FONT_20
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_dejavu_20.c
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_dejavu_20_cyrillic.c
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_dejavu_20_latin_sup.c
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_symbol_20.c
+)
+
+zephyr_library_sources_ifdef( CONFIG_LVGL_BUILD_IN_FONT_30
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_dejavu_30.c
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_dejavu_30_cyrillic.c
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_dejavu_30_latin_sup.c
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_symbol_30.c
+)
+
+zephyr_library_sources_ifdef( CONFIG_LVGL_BUILD_IN_FONT_40
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_dejavu_40.c
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_dejavu_40_cyrillic.c
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_dejavu_40_latin_sup.c
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_symbol_40.c
+)
+
+zephyr_library_sources_ifdef( CONFIG_LVGL_BUILD_IN_FONT_MONOSPACE
+ ${LVGL_SOURCE_DIR}/lv_fonts/lv_font_monospace_8.c
+)
+
+zephyr_library_sources_ifdef( CONFIG_LVGL_COLOR_DEPTH_32
+ lvgl_color_32.c
+)
+
+zephyr_library_sources_ifdef( CONFIG_LVGL_COLOR_DEPTH_16
+ lvgl_color_16.c
+)
+
+zephyr_library_sources_ifdef( CONFIG_LVGL_COLOR_DEPTH_8
+ lvgl_color_8.c
+)
+
+zephyr_library_sources_ifdef( CONFIG_LVGL_COLOR_DEPTH_1
+ lvgl_color_1.c
+)
+
+zephyr_library_sources_ifdef( CONFIG_LVGL_FILESYSTEM
+ lvgl_fs.c
+)
+
+zephyr_library_sources(lvgl.c)
+
+zephyr_library_sources_ifdef( CONFIG_LVGL_MEM_POOL_USER lvgl_mem_user.c)
+
+zephyr_library_sources_ifdef( CONFIG_LVGL_MEM_POOL_KERNEL lvgl_mem_kernel.c)
+
+zephyr_library_link_libraries(lvgl)
+
+target_link_libraries(lvgl INTERFACE zephyr_interface)
diff --git a/lib/gui/lvgl/Kconfig b/lib/gui/lvgl/Kconfig
new file mode 100644
index 0000000..b2146d2
--- /dev/null
+++ b/lib/gui/lvgl/Kconfig
@@ -0,0 +1,341 @@
+#
+# Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+config LVGL
+ bool "LittlevGL Support"
+ help
+ This option enables the LittlevGL GUI library.
+
+if LVGL
+
+module = LVGL
+module-str = lvgl
+source "subsys/logging/Kconfig.template.log_config"
+
+config LVGL_DISPLAY_DEV_NAME
+ string "Display device name"
+ default "DISPLAY"
+ help
+ Name of the display device to use for rendering.
+
+config LVGL_HOR_RES
+ int "Horizontal Screen Resolution"
+ default 320
+ help
+ Horizontal screen resolution in pixels
+
+config LVGL_VER_RES
+ int "Vertical Screen Resolution"
+ default 240
+ help
+ Vertical screen resolution in pixels
+
+config LVGL_DPI
+ int "DPI"
+ default 100
+ help
+ Dots per inch (DPI)
+
+choice
+ prompt "Color Depth"
+ default LVGL_COLOR_DEPTH_32
+ help
+ Color depth to be used by library
+
+ config LVGL_COLOR_DEPTH_32
+ bool "32-bit"
+
+ config LVGL_COLOR_DEPTH_16
+ bool "16-bit"
+
+ config LVGL_COLOR_DEPTH_8
+ bool "8-bit"
+
+ config LVGL_COLOR_DEPTH_1
+ bool "1-bit"
+
+endchoice
+
+config LVGL_BITS_PER_PIXEL
+ int "Bits per pixel"
+ default 0
+ help
+ Number of bits per pixel, in case the number of pixels should be derived
+ from the color depth set the number of pixels to zero.
+
+if LVGL_COLOR_DEPTH_16
+
+config LVGL_COLOR_16_SWAP
+ bool "RGB565 byte swap"
+ help
+ Swap the 2 bytes of a RGB565 pixel.
+
+endif
+
+if LVGL_COLOR_DEPTH_32
+
+config CONFIG_LVGL_COLOR_SCREEN_TRANSP
+ bool "Transparency support"
+ help
+ Enable screen transparency. Useful for OSD or other overlapping GUISs.
+
+endif
+
+choice
+ prompt "Chroma key color"
+ default LVGL_CHROMA_KEY_GREEN
+ help
+ Color to to use as chroma key
+
+ config LVGL_CHROMA_KEY_RED
+ bool "Red"
+
+ config LVGL_CHROMA_KEY_GREEN
+ bool "Green"
+
+ config LVGL_CHROMA_KEY_BLUE
+ bool "Blue"
+
+ config LVGL_CHROMA_KEY_CUSTOM
+ bool "Custom"
+
+endchoice
+
+if LVGL_CHROMA_KEY_CUSTOM
+
+config LVGL_CUSTOM_CHROMA_KEY_RED
+ hex "Chroma Key Red"
+ range 0x00 0xFF
+ default 0x00
+ help
+ Value of the color red to be used in the chroma key
+
+config LVGL_CUSTOM_CHROMA_KEY_GREEN
+ hex "Chroma Key Green"
+ range 0x00 0xFF
+ default 0xFF
+ help
+ Value of the color green to be used in the chroma key
+
+config LVGL_CUSTOM_CHROMA_KEY_BLUE
+ hex "Chroma Key Blue"
+ range 0x00 0xFF
+ default 0x00
+ help
+ Value of the color blue to be used in the chroma key
+
+endif
+
+choice
+ prompt "Memory pool"
+ default LVGL_MEM_POOL_HEAP_KERNEL
+ help
+ Memory pool to use for lvgl allocated objects
+
+ config LVGL_MEM_POOL_HEAP_KERNEL
+ bool "Kernel Heap"
+ depends on HEAP_MEM_POOL_SIZE != 0
+ help
+ Use k_malloc and k_free to allocate objects on the kernel heap
+
+ config LVGL_MEM_POOL_HEAP_LIB_C
+ bool "C library Heap"
+ depends on NEWLIB_LIBC || (MINIMAL_LIBC_MALLOC_ARENA_SIZE != 0)
+ help
+ Use C library malloc and free to allocate objects on the C library heap
+
+ config LVGL_MEM_POOL_KERNEL
+ bool "Kernel space lvgl pool"
+ help
+ Use a dedicated memory pool in kernel space to allocate lvgl objects
+ on
+
+ config LVGL_MEM_POOL_USER
+ bool "User space lvgl pool"
+ help
+ Use a dedicated memory pool in user space to allocate lvgl objects on
+
+endchoice
+
+if LVGL_MEM_POOL_KERNEL || LVGL_MEM_POOL_USER
+
+config LVGL_MEM_POOL_MIN_SIZE
+ int "Minimum memory pool block size"
+ default 16
+ help
+ Size of the smallest block in the memory pool in bytes
+
+config LVGL_MEM_POOL_MAX_SIZE
+ int "Maximum memory pool block size"
+ default 2048
+ help
+ Size of the largest block in the memory pool in bytes
+
+config LVGL_MEM_POOL_NUMBER_BLOCKS
+ int "Number of max size blocks in memory pool"
+ default 1
+ help
+ Number of maximum sized blocks in the memory pool.
+
+endif
+
+config LVGL_VDB_SIZE
+ int "Virtual Display Buffer Size"
+ default 10
+ range 1 100
+ help
+ Virtual Display Buffer (double buffering) size as a percentage of
+ total display size.
+
+config LVGL_VDB_STATIC
+ bool "Statically allocate virtual display buffer"
+ default y
+ help
+ Statically allocate virtual display buffer. If disabled pointer should be
+ passed via lv_vdb_set_adr().
+
+config LVGL_DOUBLE_VDB
+ bool "Use 2 Virtual Display Buffers"
+ help
+ Use 2 virtual display buffers to render and flush data in parallel
+
+config LVGL_SCREEN_REFRESH_PERIOD
+ int "Screen refresh period"
+ default 50
+ help
+ Screen refresh period in milliseconds
+
+config LVGL_INPUT_REFRESH_PERIOD
+ int "Input device refresh period"
+ default 50
+ help
+ Refresh period for input devices in milliseconds
+
+config LVGL_INPUT_MARK_PRESSED_POINTS
+ bool "Mark pressed points"
+ depends on LVGL_DIRECT_DRAW
+ help
+ Mark the pressed points on the screen.
+
+config LVGL_INPUT_DRAG_THRESHOLD
+ int "Drag Threshold"
+ default 10
+ help
+ Threshold in pixels before entering drag mode
+
+config LVGL_INPUT_DRAG_THROW_SLOW_DOWN
+ int "Drag throw slow-down"
+ default 20
+ range 0 100
+ help
+ Percentage of slow down of a throw following a drag.
+ Greater percentage means faster slow-down.
+
+config LVGL_INPUT_LONG_PRESS_TIME
+ int "Long press time"
+ default 400
+ help
+ Period in milliseconds before a press is seen as a long press
+
+config LVGL_INPUT_LONG_RESS_REPEAT_TIME
+ int "Long press repeat time"
+ default 100
+ help
+ Period in milliseconds after which a new trigger is generated
+ for a long press
+
+config LVGL_AVG_OBJ_COUNT
+ int "Average object counter"
+ default 32
+ help
+ Average object counter on a screen
+
+config LVGL_UTF_8
+ bool "Enable UTF-8 support"
+ default y
+ help
+ Enable UTF-8 support
+
+config LVGL_TEXT_BREAK_CHARACTERS
+ string "Text break characters"
+ default " ,.;:-_"
+ help
+ Characters on which a text break can take place
+
+config LVGL_ANTIALIAS
+ bool "Enable anti-aliasing"
+ default y
+ help
+ Enable anti-aliasing
+
+config LVGL_ANIMATION
+ bool "Enable animations"
+ default y
+ help
+ Enable animations
+
+config LVGL_SHADOW
+ bool "Enable shadows"
+ default y
+ help
+ Enable shadows
+
+config LVGL_GROUP
+ bool "Enable group support"
+ default y
+ help
+ Enable group support.
+ Used by keyboard and button input
+
+config LVGL_GPU
+ bool "Enable GPU support"
+ help
+ Enable GPU support
+
+config LVGL_DIRECT_DRAW
+ bool "Enable direct draw"
+ default y
+ help
+ Enable direct draw support.
+ Direct draw bypasses virtual display buffer and directly writes to
+ frame buffer
+
+config LVGL_FILESYSTEM
+ bool "Enable file system"
+ depends on FILE_SYSTEM
+ default y if FILE_SYSTEM
+ help
+ Enable LittlevGL file system
+
+config LVGL_VLA_SUPPORT
+ bool "Enable variable length array support"
+ default y
+ help
+ Enable variable length array support
+
+config LVGL_COMPILER_NON_CONST_INIT_SUPPORTED
+ bool "Enable non constant init"
+ default y
+ help
+ Indicate if initialization with non constant values is supported
+
+rsource "Kconfig.themes"
+
+rsource "Kconfig.fonts"
+
+rsource "Kconfig.objects"
+
+config APP_LINK_WITH_LVGL
+ bool "Link 'app' with LVGL"
+ default y
+ depends on LVGL
+ help
+ Add LVGL header files to the 'app' include path. It may be
+ disabled if the include paths for LVGL are causing aliasing
+ issues for 'app'.
+
+endif
+
diff --git a/lib/gui/lvgl/Kconfig.fonts b/lib/gui/lvgl/Kconfig.fonts
new file mode 100644
index 0000000..b101c6b
--- /dev/null
+++ b/lib/gui/lvgl/Kconfig.fonts
@@ -0,0 +1,189 @@
+#
+# Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+menu "Fonts"
+
+config LVGL_BUILD_IN_FONTS
+ bool "Enable build-in fonts"
+ default y
+ help
+ Enable build-in font support
+
+if LVGL_BUILD_IN_FONTS
+
+config LVGL_BUILD_IN_FONT_10
+ bool "Enable build-in 10px fonts"
+ help
+ Enable build-in font support, size 10 pixels
+
+if LVGL_BUILD_IN_FONT_10
+
+config LVGL_BUILD_IN_FONT_10_ASCII_BPP
+ int "ASCII character set BPP"
+ default 0
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+config LVGL_BUILD_IN_FONT_10_LATIN_SUP_BPP
+ int "Latin supplement character set BPP"
+ default 0
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+config LVGL_BUILD_IN_FONT_10_CYRILLIC_BPP
+ int "Cyrillic character set BPP"
+ default 0
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+config LVGL_BUILD_IN_FONT_10_SYMBOL_BPP
+ int "Symbol character set BPP"
+ default 0
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+endif
+
+config LVGL_BUILD_IN_FONT_20
+ bool "Enable build-in 20px fonts"
+ default y
+ help
+ Enable build-in font support, size 20 pixels
+
+if LVGL_BUILD_IN_FONT_20
+
+config LVGL_BUILD_IN_FONT_20_ASCII_BPP
+ int "ASCII character set BPP"
+ default 4
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+config LVGL_BUILD_IN_FONT_20_LATIN_SUP_BPP
+ int "Latin supplement character set BPP"
+ default 0
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+config LVGL_BUILD_IN_FONT_20_CYRILLIC_BPP
+ int "Cyrillic character set BPP"
+ default 0
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+config LVGL_BUILD_IN_FONT_20_SYMBOL_BPP
+ int "Symbol character set BPP"
+ default 4
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+endif
+
+config LVGL_BUILD_IN_FONT_30
+ bool "Enable build-in 30px fonts"
+ help
+ Enable build-in font support, size 30 pixels
+
+if LVGL_BUILD_IN_FONT_30
+
+config LVGL_BUILD_IN_FONT_30_ASCII_BPP
+ int "ASCII character set BPP"
+ default 0
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+config LVGL_BUILD_IN_FONT_30_LATIN_SUP_BPP
+ int "Latin supplement character set BPP"
+ default 0
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+config LVGL_BUILD_IN_FONT_30_CYRILLIC_BPP
+ int "Cyrillic character set BPP"
+ default 0
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+config LVGL_BUILD_IN_FONT_30_SYMBOL_BPP
+ int "Symbol character set BPP"
+ default 0
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+endif
+
+config LVGL_BUILD_IN_FONT_40
+ bool "Enable build-in 40px fonts"
+ help
+ Enable build-in font support, size 40 pixels
+
+if LVGL_BUILD_IN_FONT_40
+
+config LVGL_BUILD_IN_FONT_40_ASCII_BPP
+ int "ASCII character set BPP"
+ default 0
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+config LVGL_BUILD_IN_FONT_40_LATIN_SUP_BPP
+ int "Latin supplement character set BPP"
+ default 0
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+config LVGL_BUILD_IN_FONT_40_CYRILLIC_BPP
+ int "Cyrillic character set BPP"
+ default 0
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+config LVGL_BUILD_IN_FONT_40_SYMBOL_BPP
+ int "Symbol character set BPP"
+ default 0
+ help
+ Bits per pixel (1,2,4,8) for font, 0 will disable font
+
+endif
+
+endif
+
+config LVGL_BUILD_IN_FONT_MONOSPACE
+ bool "Enable build-in monospace font"
+ help
+ Enable build-in monospace font support
+
+choice
+ prompt "Default LVGL font"
+ default LVGL_DEFAULT_FONT_BUILD_IN_20_ASCII
+
+ config LVGL_DEFAULT_FONT_BUILD_IN_10_ASCII
+ bool "Build-in ASCII font 10"
+ depends on LVGL_BUILD_IN_FONT_10 && LVGL_BUILD_IN_FONT_10_ASCII_BPP != 0
+
+ config LVGL_DEFAULT_FONT_BUILD_IN_20_ASCII
+ bool "Build-in ASCII font 20"
+ depends on LVGL_BUILD_IN_FONT_20 && LVGL_BUILD_IN_FONT_20_ASCII_BPP != 0
+
+ config LVGL_DEFAULT_FONT_BUILD_IN_30_ASCII
+ bool "Build-in ASCII font 30"
+ depends on LVGL_BUILD_IN_FONT_30 && LVGL_BUILD_IN_FONT_30_ASCII_BPP != 0
+
+ config LVGL_DEFAULT_FONT_BUILD_IN_40_ASCII
+ bool "Build-in ASCII font 40"
+ depends on LVGL_BUILD_IN_FONT_40 && LVGL_BUILD_IN_FONT_40_ASCII_BPP != 0
+
+ config LVGL_DEFAULT_FONT_BUILD_IN_MONOSPACE
+ bool "Build-in monospace font"
+ depends on LVGL_BUILD_IN_FONT_MONOSPACE
+
+ config LVGL_DEFAULT_FONT_CUSTOM
+ bool "Custom font"
+ help
+ Use a none build-in font as default font. A pointer named lv_default_font_custom_ptr
+ should exists as a global variable and pint yo a valid font structure
+
+endchoice
+
+endmenu
diff --git a/lib/gui/lvgl/Kconfig.objects b/lib/gui/lvgl/Kconfig.objects
new file mode 100644
index 0000000..cc65364
--- /dev/null
+++ b/lib/gui/lvgl/Kconfig.objects
@@ -0,0 +1,296 @@
+#
+# Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+menu "Objects"
+
+config LVGL_OBJ_LABEL
+ bool "Label Object"
+ default y
+ help
+ Enable label support
+
+if LVGL_OBJ_LABEL
+
+config LVGL_OBJ_LABEL_SCROLL_SPEED
+ int "Label scroll speed"
+ default 25
+ help
+ Scroll speed in pixels per second if scroll mode is enabled for a label
+
+endif
+
+config LVGL_OBJ_IMAGE
+ bool "Image Object"
+ default y
+ depends on LVGL_OBJ_LABEL
+ help
+ Enable image object support
+
+if LVGL_OBJ_IMAGE
+
+config LVGL_IMG_CF_INDEXED
+ bool "Enable indexed image support"
+ default y
+ help
+ Enable support for indexed images
+
+config LVGL_IMG_CF_ALPHA
+ bool "Enable alpha indexed image support"
+ default y
+ help
+ Enable support for alpha indexed images
+
+endif
+
+config LVGL_OBJ_LINE
+ bool "Line Object"
+ default y
+ help
+ Enable line object support
+
+config LVGL_OBJ_ARC
+ bool "Arc Object"
+ default y
+ help
+ Enable arc object support
+
+config LVGL_OBJ_CONTAINER
+ bool "Container Object"
+ default y
+ help
+ Enable container object support
+
+config LVGL_OBJ_PAGE
+ bool "Page object"
+ default y
+ depends on LVGL_OBJ_CONTAINER
+ help
+ Enable page object support
+
+config LVGL_OBJ_WINDOW
+ bool "Window object"
+ default y
+ depends on LVGL_OBJ_CONTAINER && LVGL_OBJ_BUTTON && LVGL_OBJ_LABEL && LVGL_OBJ_IMAGE && LVGL_OBJ_PAGE
+ help
+ Enable window object support
+
+config LVGL_OBJ_TAB_VIEW
+ bool "Tab view object"
+ default y
+ depends on LVGL_OBJ_PAGE && LVGL_OBJ_BUTTON_MATRIX
+ help
+ Enable tab view object support
+
+if LVGL_OBJ_TAB_VIEW
+
+config LVGL_OBJ_TAB_VIEW_ANIMATION_TIME
+ int "Tab view animation time"
+ default 300
+ help
+ Tab view animation time in milliseconds
+
+endif
+
+config LVGL_OBJ_CALENDAR
+ bool "Calendar object"
+ default y
+ help
+ Enable calendar object support
+
+config LVGL_OBJ_PRELOAD
+ bool "Pre-load object"
+ default y
+ depends on LVGL_OBJ_ARC
+ help
+ Enabled pre-load object support
+
+if LVGL_OBJ_PRELOAD
+
+config LVGL_OBJ_PRELOAD_DEF_ARC_LENGTH
+ int "Default arc length"
+ range 1 360
+ default 60
+ help
+ Default arc length for pre-load in degrees
+
+config LVGL_OBJ_PRELOAD_DEF_SPIN_TIME
+ int "Default spin time"
+ default 1000
+ help
+ Default spin time for pre-load in ms
+
+endif
+
+config LVGL_OBJ_BAR
+ bool "Bar object"
+ default y
+ help
+ Enable bar object support
+
+config LVGL_OBJ_LINE_METER
+ bool "Line meter object"
+ default y
+ help
+ Enable line meter object support
+
+config LVGL_OBJ_GAUGE
+ bool "Gauge object"
+ default y
+ depends on LVGL_OBJ_BAR && LVGL_OBJ_LINE_METER
+ help
+ Enable gauge object support
+
+config LVGL_OBJ_CHART
+ bool "Chart object"
+ default y
+ help
+ Enable chart object support
+
+config LVGL_OBJ_LED
+ bool "LED object"
+ default y
+ help
+ Enable LED object support
+
+config LVGL_OBJ_MSG_BOX
+ bool "Message box object"
+ default y
+ depends on LVGL_OBJ_BUTTON_MATRIX && LVGL_OBJ_LABEL
+ help
+ Enable message box object support
+
+config LVGL_OBJ_TEXT_AREA
+ bool "Text area object"
+ default y
+ depends on LVGL_OBJ_LABEL && LVGL_OBJ_PAGE
+ help
+ Enable text area object support
+
+if LVGL_OBJ_TEXT_AREA
+
+config LVGL_OBJ_TEXT_AREA_CURSOR_BLINK_TIME
+ int "Cursor Blink Time"
+ default 400
+ help
+ Text area cursor blink time in milliseconds
+
+config LVGL_OBJ_TEXT_AREA_PWD_SHOW_TIME
+ int "Label scroll speed"
+ default 1500
+ help
+ Password character show time in milliseconds
+
+endif
+
+config LVGL_OBJ_BUTTON
+ bool "Button object"
+ default y
+ depends on LVGL_OBJ_CONTAINER
+ help
+ Enable button object support
+
+if LVGL_OBJ_BUTTON
+
+config LVGL_OBJ_BUTTON_INK_EFFECT
+ bool "Enable ink effect"
+ default y
+ help
+ Enable ink, press, effect for buttons
+
+config LVGL_OBJ_IMG_BUTTON
+ bool "Image Button"
+ default y
+ help
+ Enable image button object support
+
+endif
+
+config LVGL_OBJ_BUTTON_MATRIX
+ bool "Button Matrix object"
+ default y
+ help
+ Enable button matrix object support
+
+config LVGL_OBJ_KEYBOARD
+ bool "Keyboard object"
+ default y
+ depends on LVGL_OBJ_BUTTON_MATRIX
+ help
+ Enable keyboard object support
+
+config LVGL_OBJ_CHECK_BOX
+ bool "Check box object"
+ default y
+ depends on LVGL_OBJ_BUTTON && LVGL_OBJ_LABEL
+ help
+ Enable check box object support
+
+config LVGL_OBJ_LIST
+ bool "List object"
+ default y
+ depends on LVGL_OBJ_BUTTON && LVGL_OBJ_LABEL && LVGL_OBJ_PAGE
+ help
+ Enable list object support
+
+if LVGL_OBJ_LIST
+
+config LVGL_OBJ_LIST_FOCUS_TIME
+ int "List focus time"
+ default 100
+ help
+ List focus animation time in milliseconds
+
+endif
+
+config LVGL_OBJ_DROP_DOWN_LIST
+ bool "Drop Down List object"
+ default y
+ depends on LVGL_OBJ_LABEL && LVGL_OBJ_PAGE
+ help
+ Enable drop down list object support
+
+if LVGL_OBJ_DROP_DOWN_LIST
+
+config LVGL_OBJ_DROP_DOWN_LIST_ANIM_TIME
+ int "Drop Down list animation time"
+ default 200
+ help
+ Drop down list animation time in milliseconds
+
+endif
+
+config LVGL_OBJ_ROLLER
+ bool "Roller object"
+ default y
+ depends on LVGL_OBJ_DROP_DOWN_LIST
+ help
+ Enable roller object support
+
+if LVGL_OBJ_ROLLER
+
+config LVGL_OBJ_ROLLER_ANIM_TIME
+ int "Roller animation time"
+ default 200
+ help
+ Roller animation time in milliseconds
+
+endif
+
+config LVGL_OBJ_SLIDER
+ bool "Slider object"
+ default y
+ depends on LVGL_OBJ_BAR
+ help
+ Enable slider object support
+
+config LVGL_OBJ_SWITCH
+ bool "Switch object"
+ default y
+ depends on LVGL_OBJ_SLIDER
+ help
+ Enable switch object support
+
+endmenu
diff --git a/lib/gui/lvgl/Kconfig.themes b/lib/gui/lvgl/Kconfig.themes
new file mode 100644
index 0000000..160e89a
--- /dev/null
+++ b/lib/gui/lvgl/Kconfig.themes
@@ -0,0 +1,59 @@
+#
+# Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+menu "Themes"
+
+config LVGL_THEMES
+ bool "Enable build-in themes"
+ help
+ Enable build-in themes
+
+if LVGL_THEMES
+
+config LVGL_THEME_LIVE_UPDATE
+ bool "Enable runtime theme switching"
+ help
+ Enable runtime theme switching, this will consume 8 to 10kB of RAM.
+
+config LVGL_THEME_DEFAULT
+ bool "Enable default theme support"
+ help
+ Enable default theme support.
+ Low RAM footprint theme.
+
+config LVGL_THEME_ALIEN
+ bool "Enable alien theme support"
+ help
+ Enable alien theme, dark futuristic, support
+
+config LVGL_THEME_NIGHT
+ bool "Enable night theme support"
+ help
+ Enable night theme, dark elegant, support
+
+config LVGL_THEME_MONO
+ bool "Enable mono theme support"
+ help
+ Enable mono theme, monochrome, support
+
+config LVGL_THEME_MATERIAL
+ bool "Enable material theme support"
+ help
+ Enable material theme, flat theme with bold colors and light shadow, support
+
+config LVGL_THEME_ZEN
+ bool "Enable zen theme support"
+ help
+ Enable zen theme, peaceful light theme, support
+
+config LVGL_THEME_NEMO
+ bool "Enable nemo theme support"
+ help
+ Enable water-like theme based on the movie "Finding Nemo"
+
+endif
+
+endmenu
diff --git a/lib/gui/lvgl/lv_conf.h b/lib/gui/lvgl/lv_conf.h
new file mode 100644
index 0000000..dcfe0a9
--- /dev/null
+++ b/lib/gui/lvgl/lv_conf.h
@@ -0,0 +1,374 @@
+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_LIB_GUI_LVGL_LV_CONF_H_
+#define ZEPHYR_LIB_GUI_LVGL_LV_CONF_H_
+
+/* Dynamic memory */
+
+#define LV_MEM_CUSTOM 1
+
+#ifdef CONFIG_LVGL_MEM_POOL_HEAP_KERNEL
+
+#define LV_MEM_CUSTOM_INCLUDE "kernel.h"
+#define LV_MEM_CUSTOM_ALLOC k_malloc
+#define LV_MEM_CUSTOM_FREE k_free
+
+#elif defined(CONFIG_LVGL_MEM_POOL_HEAP_LIB_C)
+
+#define LV_MEM_CUSTOM_INCLUDE "stdlib.h"
+#define LV_MEM_CUSTOM_ALLOC malloc
+#define LV_MEM_CUSTOM_FREE free
+
+#else
+
+#define LV_MEM_CUSTOM_INCLUDE "lvgl_mem.h"
+#define LV_MEM_CUSTOM_ALLOC lvgl_malloc
+#define LV_MEM_CUSTOM_FREE lvgl_free
+
+#endif
+
+/* Graphics settings */
+
+#define LV_HOR_RES CONFIG_LVGL_HOR_RES
+#define LV_VER_RES CONFIG_LVGL_VER_RES
+#define LV_DPI CONFIG_LVGL_DPI
+
+#define LV_VDB_SIZE (CONFIG_LVGL_VDB_SIZE * CONFIG_LVGL_HOR_RES \
+ * CONFIG_LVGL_VER_RES / 100)
+
+#if CONFIG_LVGL_BITS_PER_PIXEL == 0
+#define LV_VDB_PX_BPP LV_COLOR_SIZE
+#else
+#define LV_VDB_PX_BPP CONFIG_LVGL_BITS_PER_PIXEL
+#endif
+
+#ifdef CONFIG_LVGL_VDB_STATIC
+#define LV_VDB_ADR 0
+#else
+#define LV_VDB_ADR LV_VDB_ADR_INV
+#endif
+
+
+#define LV_VDB_DOUBLE CONFIG_LVGL_DOUBLE_VDB
+#ifdef CONFIG_LVGL_VDB_STATIC
+#define LV_VDB2_ADR 0
+#else
+#define LV_VDB2_ADR LV_VDB_ADR_INV
+#endif
+
+#ifdef CONFIG_LVGL_ANTIALIAS
+#define LV_ANTIALIAS CONFIG_LVGL_ANTIALIAS
+#else
+#define LV_ANTIALIAS 0
+#endif
+
+#define LV_REFR_PERIOD CONFIG_LVGL_SCREEN_REFRESH_PERIOD
+#define LV_INV_FIFO_SIZE CONFIG_LVGL_AVG_OBJ_COUNT
+
+/* Miscellaneous setting */
+
+#define LV_INDEV_READ_PERIOD CONFIG_LVGL_INPUT_REFRESH_PERIOD
+#define LV_INDEV_POINT_MARKER CONFIG_LVGL_INPUT_MARK_PRESSED_POINTS
+#define LV_INDEV_DRAG_LIMIT CONFIG_LVGL_INPUT_DRAG_THRESHOLD
+#define LV_INDEV_DRAG_THROW CONFIG_LVGL_INPUT_DRAG_THROW_SLOW_DOWN
+#define LV_INDEV_LONG_PRESS_TIME CONFIG_LVGL_INPUT_LONG_PRESS_TIME
+#define LV_INDEV_LONG_PRESS_REP_TIME CONFIG_LVGL_INPUT_LONG_RESS_REPEAT_TIME
+
+#ifdef CONFIG_LVGL_COLOR_DEPTH_32
+#define LV_COLOR_DEPTH 32
+#elif defined(CONFIG_LVGL_COLOR_DEPTH_16)
+#define LV_COLOR_DEPTH 16
+#elif defined(CONFIG_LVGL_COLOR_DEPTH_8)
+#define LV_COLOR_DEPTH 8
+#elif defined(CONFIG_LVGL_COLOR_DEPTH_1)
+#define LV_COLOR_DEPTH 1
+#else
+#error No color depth defined
+#endif
+
+#define LV_COLOR_16_SWAP CONFIG_LVGL_COLOR_16_SWAP
+#define LV_COLOR_SCREEN_TRANSP CONFIG_LVGL_COLOR_SCREEN_TRANSP
+
+#ifdef CONFIG_LVGL_CHROMA_KEY_RED
+#define LV_COLOR_TRANSP LV_COLOR_RED
+#elif defined(CONFIG_LVGL_CHROMA_KEY_GREEN)
+#define LV_COLOR_TRANSP LV_COLOR_LIME
+#elif defined(CONFIG_LVGL_CHROMA_KEY_BLUE)
+#define LV_COLOR_TRANSP LV_COLOR_BLUE
+#elif defined(CONFIG_LVGL_CHROMA_KEY_CUSTOM)
+#define LV_COLOR_TRANSP LV_COLOR_MAKE(CONFIG_LVGL_CUSTOM_CHROMA_KEY_RED, \
+ CONFIG_LVGL_CUSTOM_CHROMA_KEY_GREEN, \
+ CONFIG_LVGL_CUSTOM_CHROMA_KEY_BLUE)
+#else
+#error No chroma key defined
+#endif
+
+#define LV_TXT_UTF8 CONFIG_LVGL_UTF_8
+#define LV_TXT_BREAK_CHARS CONFIG_LVGL_TEXT_BREAK_CHARACTERS
+
+#define USE_LV_ANIMATION CONFIG_LVGL_ANIMATION
+#define USE_LV_SHADOW CONFIG_LVGL_SHADOW
+#define USE_LV_GROUP CONFIG_LVGL_GROUP
+#define USE_LV_GPU CONFIG_LVGL_GPU
+#define USE_LV_REAL_DRAW CONFIG_LVGL_DIRECT_DRAW
+#define USE_LV_FILESYSTEM CONFIG_LVGL_FILESYSTEM
+
+#define LV_ATTRIBUTE_TICK_INC
+#define LV_ATTRIBUTE_TASK_HANDLER
+#define LV_COMPILER_VLA_SUPPORTED CONFIG_LVGL_VLA_SUPPORT
+#define LV_COMPILER_NON_CONST_INIT_SUPPORTED \
+ CONFIG_LVGL_COMPILER_NON_CONST_INIT_SUPPORTED
+
+#define LV_TICK_CUSTOM 1
+#define LV_TICK_CUSTOM_INCLUDE "kernel.h"
+#define LV_TICK_CUSTOM_SYS_TIME_EXPR (k_uptime_get_32())
+
+#if CONFIG_LVGL_LOG_LEVEL == 0
+#define USE_LV_LOG 0
+#else
+#define USE_LV_LOG 1
+
+#if CONFIG_LVGL_LOG_LEVEL == 1
+#define LV_LOG_LEVEL LV_LOG_LEVEL_ERROR
+#elif CONFIG_LVGL_LOG_LEVEL == 2
+#define LV_LOG_LEVEL LV_LOG_LEVEL_WARN
+#elif CONFIG_LVGL_LOG_LEVEL == 3
+#define LV_LOG_LEVEL LV_LOG_LEVEL_INFO
+#elif CONFIG_LVGL_LOG_LEVEL == 4
+#define LV_LOG_LEVEL LV_LOG_LEVEL_TRACE
+#else
+#error Invalid log level defined
+#endif
+
+#define LV_LOG_PRINTF 0
+#endif
+
+/* Theme support */
+
+#ifdef CONFIG_LVGL_THEMES
+
+#define LV_THEME_LIVE_UPDATE CONFIG_LVGL_THEME_LIVE_UPDATE
+
+#define USE_LV_THEME_TEMPL 0
+#define USE_LV_THEME_DEFAULT CONFIG_LVGL_THEME_DEFAULT
+#define USE_LV_THEME_ALIEN CONFIG_LVGL_THEME_ALIEN
+#define USE_LV_THEME_NIGHT CONFIG_LVGL_THEME_NIGHT
+#define USE_LV_THEME_MONO CONFIG_LVGL_THEME_MONO
+#define USE_LV_THEME_MATERIAL CONFIG_LVGL_THEME_MATERIAL
+#define USE_LV_THEME_ZEN CONFIG_LVGL_THEME_ZEN
+#define USE_LV_THEME_NEMO CONFIG_LVGL_THEME_NEMO
+
+#else
+
+#define LV_THEME_LIVE_UPDATE 0
+
+#define USE_LV_THEME_TEMPL 0
+#define USE_LV_THEME_DEFAULT 0
+#define USE_LV_THEME_ALIEN 0
+#define USE_LV_THEME_NIGHT 0
+#define USE_LV_THEME_MONO 0
+#define USE_LV_THEME_MATERIAL 0
+#define USE_LV_THEME_ZEN 0
+#define USE_LV_THEME_NEMO 0
+
+#endif
+
+/* Font support */
+
+#ifdef CONFIG_LVGL_DEFAULT_FONT_BUILD_IN_10_ASCII
+#define LV_FONT_DEFAULT (&lv_font_dejavu_10)
+#elif defined(CONFIG_LVGL_DEFAULT_FONT_BUILD_IN_20_ASCII)
+#define LV_FONT_DEFAULT (&lv_font_dejavu_20)
+#elif defined(CONFIG_LVGL_DEFAULT_FONT_BUILD_IN_30_ASCII)
+#define LV_FONT_DEFAULT (&lv_font_dejavu_30)
+#elif defined(CONFIG_LVGL_DEFAULT_FONT_BUILD_IN_40_ASCII)
+#define LV_FONT_DEFAULT (&lv_font_dejavu_40)
+#elif defined(CONFIG_LVGL_DEFAULT_FONT_BUILD_IN_MONOSPACE)
+#define LV_FONT_DEFAULT (&lv_font_monospace_8)
+#elif defined(CONFIG_LVGL_DEFAULT_FONT_CUSTOM)
+extern void *lv_default_font_custom_ptr;
+#define LV_FONT_DEFAULT ((lv_font_t *) lv_default_font_custom_ptr)
+#else
+#error No defulat font defined
+#endif
+
+#ifdef CONFIG_LVGL_BUILD_IN_FONT_10
+
+#define USE_LV_FONT_DEJAVU_10 \
+ CONFIG_LVGL_BUILD_IN_FONT_10_ASCII_BPP
+#define USE_LV_FONT_DEJAVU_10_LATIN_SUP \
+ CONFIG_LVGL_BUILD_IN_FONT_10_LATIN_SUP_BPP
+#define USE_LV_FONT_DEJAVU_10_CYRILLIC \
+ CONFIG_LVGL_BUILD_IN_FONT_10_CYRILLIC_BPP
+#define USE_LV_FONT_SYMBOL_10 \
+ CONFIG_LVGL_BUILD_IN_FONT_10_SYMBOL_BPP
+
+#else
+
+#define USE_LV_FONT_DEJAVU_10 0
+#define USE_LV_FONT_DEJAVU_10_LATIN_SUP 0
+#define USE_LV_FONT_DEJAVU_10_CYRILLIC 0
+#define USE_LV_FONT_SYMBOL_10 0
+
+#endif
+
+#if CONFIG_LVGL_BUILD_IN_FONT_20
+
+#define USE_LV_FONT_DEJAVU_20 \
+ CONFIG_LVGL_BUILD_IN_FONT_20_ASCII_BPP
+#define USE_LV_FONT_DEJAVU_20_LATIN_SUP \
+ CONFIG_LVGL_BUILD_IN_FONT_20_LATIN_SUP_BPP
+#define USE_LV_FONT_DEJAVU_20_CYRILLIC \
+ CONFIG_LVGL_BUILD_IN_FONT_20_CYRILLIC_BPP
+#define USE_LV_FONT_SYMBOL_20 \
+ CONFIG_LVGL_BUILD_IN_FONT_20_SYMBOL_BPP
+
+#else
+
+#define USE_LV_FONT_DEJAVU_20 0
+#define USE_LV_FONT_DEJAVU_20_LATIN_SUP 0
+#define USE_LV_FONT_DEJAVU_20_CYRILLIC 0
+#define USE_LV_FONT_SYMBOL_20 0
+
+#endif
+
+#if CONFIG_LVGL_BUILD_IN_FONT_30
+
+#define USE_LV_FONT_DEJAVU_30 \
+ CONFIG_LVGL_BUILD_IN_FONT_30_ASCII_BPP
+#define USE_LV_FONT_DEJAVU_30_LATIN_SUP \
+ CONFIG_LVGL_BUILD_IN_FONT_30_LATIN_SUP_BPP
+#define USE_LV_FONT_DEJAVU_30_CYRILLIC \
+ CONFIG_LVGL_BUILD_IN_FONT_30_CYRILLIC_BPP
+#define USE_LV_FONT_SYMBOL_30 \
+ CONFIG_LVGL_BUILD_IN_FONT_30_SYMBOL_BPP
+
+#else
+
+#define USE_LV_FONT_DEJAVU_30 0
+#define USE_LV_FONT_DEJAVU_30_LATIN_SUP 0
+#define USE_LV_FONT_DEJAVU_30_CYRILLIC 0
+#define USE_LV_FONT_SYMBOL_30 0
+
+#endif
+
+#if CONFIG_LVGL_BUILD_IN_FONT_40
+
+#define USE_LV_FONT_DEJAVU_40 \
+ CONFIG_LVGL_BUILD_IN_FONT_40_ASCII_BPP
+#define USE_LV_FONT_DEJAVU_40_LATIN_SUP \
+ CONFIG_LVGL_BUILD_IN_FONT_40_LATIN_SUP_BPP
+#define USE_LV_FONT_DEJAVU_40_CYRILLIC \
+ CONFIG_LVGL_BUILD_IN_FONT_40_CYRILLIC_BPP
+#define USE_LV_FONT_SYMBOL_40 \
+ CONFIG_LVGL_BUILD_IN_FONT_40_SYMBOL_BPP
+
+#else
+
+#define USE_LV_FONT_DEJAVU_40 0
+#define USE_LV_FONT_DEJAVU_40_LATIN_SUP 0
+#define USE_LV_FONT_DEJAVU_40_CYRILLIC 0
+#define USE_LV_FONT_SYMBOL_40 0
+
+#endif
+
+#define USE_LV_FONT_MONOSPACE_8 CONFIG_LVGL_BUILD_IN_FONT_MONOSPACE
+
+#define LV_FONT_CUSTOM_DECLARE
+
+/* Objects */
+#define LV_OBJ_FREE_NUM_TYPE uint32_t
+#define LV_OBJ_FREE_PTR 1
+
+#define USE_LV_LABEL CONFIG_LVGL_OBJ_LABEL
+#if USE_LV_LABEL != 0
+#define LV_LABEL_SCROLL_SPEED CONFIG_LVGL_OBJ_LABEL_SCROLL_SPEED
+#endif
+
+#define USE_LV_IMG CONFIG_LVGL_OBJ_IMAGE
+#if USE_LV_IMG != 0
+#define LV_IMG_CF_INDEXED CONFIG_LVGL_IMG_CF_INDEXED
+#define LV_IMG_CF_ALPHA CONFIG_LVGL_IMG_CF_ALPHA
+#endif
+
+#define USE_LV_LINE CONFIG_LVGL_OBJ_LINE
+
+#define USE_LV_ARC CONFIG_LVGL_OBJ_ARC
+
+#define USE_LV_CONT CONFIG_LVGL_OBJ_CONTAINER
+
+#define USE_LV_PAGE CONFIG_LVGL_OBJ_PAGE
+
+#define USE_LV_WIN CONFIG_LVGL_OBJ_WINDOW
+
+#define USE_LV_TABVIEW CONFIG_LVGL_OBJ_TAB_VIEW
+#if USE_LV_TABVIEW != 0
+#define LV_TABVIEW_ANIM_TIME CONFIG_LVGL_OBJ_TAB_VIEW_ANIMATION_TIME
+#endif
+
+#define USE_LV_CALENDAR CONFIG_LVGL_OBJ_CALENDAR
+
+#define USE_LV_PRELOAD CONFIG_LVGL_OBJ_PRELOAD
+#if USE_LV_PRELOAD != 0
+#define LV_PRELOAD_DEF_ARC_LENGTH CONFIG_LVGL_OBJ_PRELOAD_DEF_ARC_LENGTH
+#define LV_PRELOAD_DEF_SPIN_TIME CONFIG_LVGL_OBJ_PRELOAD_DEF_SPIN_TIME
+#endif
+
+#define USE_LV_BAR CONFIG_LVGL_OBJ_BAR
+
+#define USE_LV_LMETER CONFIG_LVGL_OBJ_LINE_METER
+
+#define USE_LV_GAUGE CONFIG_LVGL_OBJ_GAUGE
+
+#define USE_LV_CHART CONFIG_LVGL_OBJ_CHART
+
+#define USE_LV_LED CONFIG_LVGL_OBJ_LED
+
+#define USE_LV_MBOX CONFIG_LVGL_OBJ_MSG_BOX
+
+#define USE_LV_TA CONFIG_LVGL_OBJ_TEXT_AREA
+#if USE_LV_TA != 0
+#define LV_TA_CURSOR_BLINK_TIME \
+ CONFIG_LVGL_OBJ_TEXT_AREA_CURSOR_BLINK_TIME
+#define LV_TA_PWD_SHOW_TIME \
+ CONFIG_LVGL_OBJ_TEXT_AREA_PWD_SHOW_TIME
+#endif
+
+#define USE_LV_BTN CONFIG_LVGL_OBJ_BUTTON
+
+#if USE_LV_BTN != 0
+#define LV_BTN_INK_EFFECT CONFIG_LVGL_OBJ_BUTTON_INK_EFFECT
+#endif
+
+#define USE_LV_IMGBTN CONFIG_LVGL_OBJ_IMG_BUTTON
+
+#define USE_LV_BTNM CONFIG_LVGL_OBJ_BUTTON_MATRIX
+
+#define USE_LV_KB CONFIG_LVGL_OBJ_KEYBOARD
+
+#define USE_LV_CB CONFIG_LVGL_OBJ_CHECK_BOX
+
+#define USE_LV_LIST CONFIG_LVGL_OBJ_LIST
+#if USE_LV_LIST != 0
+#define LV_LIST_FOCUS_TIME CONFIG_LVGL_OBJ_LIST_FOCUS_TIME
+#endif
+
+#define USE_LV_DDLIST CONFIG_LVGL_OBJ_DROP_DOWN_LIST
+#if USE_LV_DDLIST != 0
+#define LV_DDLIST_ANIM_TIME CONFIG_LVGL_OBJ_DROP_DOWN_LIST_ANIM_TIME
+#endif
+
+#define USE_LV_ROLLER CONFIG_LVGL_OBJ_ROLLER
+#if USE_LV_ROLLER != 0
+#define LV_ROLLER_ANIM_TIME CONFIG_LVGL_OBJ_ROLLER_ANIM_TIME
+#endif
+
+#define USE_LV_SLIDER CONFIG_LVGL_OBJ_SLIDER
+
+#define USE_LV_SW CONFIG_LVGL_OBJ_SWITCH
+
+#endif /* ZEPHYR_LIB_GUI_LVGL_LV_CONF_H_ */
diff --git a/lib/gui/lvgl/lvgl.c b/lib/gui/lvgl/lvgl.c
new file mode 100644
index 0000000..4369374
--- /dev/null
+++ b/lib/gui/lvgl/lvgl.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <init.h>
+#include <zephyr.h>
+#include <lvgl.h>
+#include <lv_core/lv_refr.h>
+#include "lvgl_color.h"
+#include "lvgl_fs.h"
+
+#define LOG_LEVEL CONFIG_LVGL_LOG_LEVEL
+#include <logging/log.h>
+LOG_MODULE_REGISTER(lvgl);
+
+struct device *lvgl_display_dev;
+
+#if CONFIG_LVGL_LOG_LEVEL != 0
+static void lvgl_log(lv_log_level_t level, const char *file, uint32_t line,
+ const char *dsc)
+{
+ /* Convert LVGL log level to Zephyr log lvel
+ *
+ * LVGL log level mapping:
+ * * LV_LOG_LEVEL_TRACE 0
+ * * LV_LOG_LEVEL_INFO 1
+ * * LV_LOG_LEVEL_WARN 2
+ * * LV_LOG_LEVEL_ERROR 3
+ * * LV_LOG_LEVEL_NUM 4
+ *
+ * Zephyr log level mapping:
+ * * LOG_LEVEL_NONE 0
+ * * LOG_LEVEL_ERR 1
+ * * LOG_LEVEL_WRN 2
+ * * LOG_LEVEL_INF 3
+ * * LOG_LEVEL_DBG 4
+ */
+ u8_t zephyr_level = LOG_LEVEL_DBG - level;
+
+ ARG_UNUSED(file);
+ ARG_UNUSED(line);
+
+ _LOG(zephyr_level, "%s", dsc);
+}
+#endif
+
+
+static int lvgl_init(struct device *dev)
+{
+ lv_disp_drv_t disp_drv;
+
+ ARG_UNUSED(dev);
+
+ lvgl_display_dev = device_get_binding(CONFIG_LVGL_DISPLAY_DEV_NAME);
+
+ if (lvgl_display_dev == NULL) {
+ LOG_ERR("Display device not found.");
+ return -ENODEV;
+ }
+
+#if CONFIG_LVGL_LOG_LEVEL != 0
+ lv_log_register_print(lvgl_log);
+#endif
+
+ lv_init();
+
+#ifdef CONFIG_LVGL_FILESYSTEM
+ lvgl_fs_init();
+#endif
+
+ lv_refr_set_round_cb(get_round_func());
+
+ lv_disp_drv_init(&disp_drv);
+ disp_drv.disp_flush = get_disp_flush();
+
+#if CONFIG_LVGL_VDB_SIZE != 0
+ disp_drv.vdb_wr = get_vdb_write();
+#endif
+ if (lv_disp_drv_register(&disp_drv) == NULL) {
+ LOG_ERR("Failed to register display device.");
+ return -EPERM;
+ }
+
+ return 0;
+}
+
+SYS_INIT(lvgl_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);
diff --git a/lib/gui/lvgl/lvgl_color.h b/lib/gui/lvgl/lvgl_color.h
new file mode 100644
index 0000000..22b4749
--- /dev/null
+++ b/lib/gui/lvgl/lvgl_color.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_LIB_GUI_LVGL_LVGL_COLOR_H_
+#define ZEPHYR_LIB_GUI_LVGL_LVGL_COLOR_H_
+
+#include <display.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern struct device *lvgl_display_dev;
+
+void *get_disp_flush(void);
+void *get_vdb_write(void);
+void *get_round_func(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ZEPHYR_LIB_GUI_LVGL_LVGL_COLOR_H */
diff --git a/lib/gui/lvgl/lvgl_color_1.c b/lib/gui/lvgl/lvgl_color_1.c
new file mode 100644
index 0000000..52e7d59
--- /dev/null
+++ b/lib/gui/lvgl/lvgl_color_1.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <lvgl.h>
+#include "lvgl_color.h"
+
+#if CONFIG_LVGL_BITS_PER_PIXEL == 1
+
+static void zephyr_disp_flush(s32_t x1, s32_t y1, s32_t x2, s32_t y2,
+ const lv_color_t *color_p)
+{
+ u16_t w = x2 - x1 + 1;
+ u16_t h = y2 - y1 + 1;
+ struct display_capabilities cap;
+ struct display_buffer_descriptor desc;
+
+ display_get_capabilities(lvgl_display_dev, &cap);
+
+ desc.buf_size = (w * h)/8;
+ desc.width = w;
+ desc.pitch = w;
+ desc.height = h;
+ display_write(lvgl_display_dev, x1, y1, &desc, (void *) color_p);
+ if (cap.screen_info & SCREEN_INFO_DOUBLE_BUFFER) {
+ display_write(lvgl_display_dev, x1, y1, &desc,
+ (void *) color_p);
+ }
+
+ lv_flush_ready();
+}
+
+void zephyr_vdb_write(u8_t *buf, lv_coord_t buf_w, lv_coord_t x,
+ lv_coord_t y, lv_color_t color, lv_opa_t opa)
+{
+ u8_t *buf_xy = buf + x + y/8 * buf_w;
+ u8_t bit;
+ struct display_capabilities cap;
+
+ display_get_capabilities(lvgl_display_dev, &cap);
+
+ if (cap.screen_info & SCREEN_INFO_MONO_MSB_FIRST) {
+ bit = 7 - y%8;
+ } else {
+ bit = y%8;
+ }
+
+ if (cap.current_pixel_format == PIXEL_FORMAT_MONO10) {
+ if (color.full == 0) {
+ *buf_xy &= ~BIT(bit);
+ } else {
+ *buf_xy |= BIT(bit);
+ }
+ } else {
+ if (color.full == 0) {
+ *buf_xy |= BIT(bit);
+ } else {
+ *buf_xy &= ~BIT(bit);
+ }
+ }
+}
+
+void zephyr_round_area(lv_area_t *a)
+{
+ struct display_capabilities cap;
+
+ display_get_capabilities(lvgl_display_dev, &cap);
+
+ if (cap.screen_info & SCREEN_INFO_MONO_VTILED) {
+ a->y1 &= ~0x7;
+ a->y2 |= 0x7;
+ } else {
+ a->x1 &= ~0x7;
+ a->x2 |= 0x7;
+ }
+}
+
+#else
+
+#error "Unsupported pixel format conversion"
+
+#endif /* CONFIG_LVGL_BITS_PER_PIXEL */
+
+void *get_disp_flush(void)
+{
+ return zephyr_disp_flush;
+}
+
+void *get_vdb_write(void)
+{
+ return zephyr_vdb_write;
+}
+
+void *get_round_func(void)
+{
+ return zephyr_round_area;
+}
diff --git a/lib/gui/lvgl/lvgl_color_16.c b/lib/gui/lvgl/lvgl_color_16.c
new file mode 100644
index 0000000..8b34a0f
--- /dev/null
+++ b/lib/gui/lvgl/lvgl_color_16.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <lvgl.h>
+#include "lvgl_color.h"
+
+#if CONFIG_LVGL_BITS_PER_PIXEL == 0
+
+static void zephyr_disp_flush(s32_t x1, s32_t y1, s32_t x2, s32_t y2,
+ const lv_color_t *color_p)
+{
+ u16_t w = x2 - x1 + 1;
+ u16_t h = y2 - y1 + 1;
+ struct display_buffer_descriptor desc;
+
+ desc.buf_size = 2 * w * h;
+ desc.width = w;
+ desc.pitch = w;
+ desc.height = h;
+ display_write(lvgl_display_dev, x1, y1, &desc, (void *) color_p);
+
+ lv_flush_ready();
+}
+
+#define zephyr_vdb_write NULL
+
+#else
+
+#error "Unsupported pixel format conversion"
+
+#endif /* CONFIG_LVGL_BITS_PER_PIXEL */
+
+void *get_disp_flush(void)
+{
+ return zephyr_disp_flush;
+}
+
+void *get_vdb_write(void)
+{
+ return zephyr_vdb_write;
+}
+
+void *get_round_func(void)
+{
+ return NULL;
+}
diff --git a/lib/gui/lvgl/lvgl_color_32.c b/lib/gui/lvgl/lvgl_color_32.c
new file mode 100644
index 0000000..497b10d
--- /dev/null
+++ b/lib/gui/lvgl/lvgl_color_32.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <lvgl.h>
+#include "lvgl_color.h"
+
+#if CONFIG_LVGL_BITS_PER_PIXEL == 0
+
+static void zephyr_disp_flush(s32_t x1, s32_t y1, s32_t x2, s32_t y2,
+ const lv_color_t *color_p)
+{
+ u16_t w = x2 - x1 + 1;
+ u16_t h = y2 - y1 + 1;
+ struct display_buffer_descriptor desc;
+
+ desc.buf_size = 4 * w * h;
+ desc.width = w;
+ desc.pitch = w;
+ desc.height = h;
+ display_write(lvgl_display_dev, x1, y1, &desc, (void *) color_p);
+
+ lv_flush_ready();
+}
+
+#define zephyr_vdb_write NULL
+
+#elif CONFIG_LVGL_BITS_PER_PIXEL == 24
+
+static void zephyr_disp_flush(s32_t x1, s32_t y1, s32_t x2, s32_t y2,
+ const lv_color_t *color_p)
+{
+ u16_t w = x2 - x1 + 1;
+ u16_t h = y2 - y1 + 1;
+ struct display_buffer_descriptor desc;
+
+ desc.buf_size = 3 * w * h;
+ desc.width = w;
+ desc.pitch = w;
+ desc.height = h;
+ display_write(lvgl_display_dev, x1, y1, &desc, (void *) color_p);
+
+ lv_flush_ready();
+}
+
+static void zephyr_vdb_write(u8_t *buf, lv_coord_t buf_w, lv_coord_t x,
+ lv_coord_t y, lv_color_t color, lv_opa_t opa)
+{
+ u8_t *buf_xy = buf + x + y * buf_w;
+
+ if (opa != LV_OPA_COVER) {
+ lv_color_t mix_color;
+
+ mix_color.red = *buf_xy;
+ mix_color.green = *(buf_xy+1);
+ mix_color.blue = *(buf_xy+2);
+ color = lv_color_mix(color, mix_color, opa);
+ }
+
+ *buf_xy = color.red;
+ *(buf_xy + 1) = color.green;
+ *(buf_xy + 2) = color.blue;
+}
+
+#else
+
+#error "Unsupported pixel format conversion"
+
+#endif /* CONFIG_LVGL_BITS_PER_PIXEL */
+
+void *get_disp_flush(void)
+{
+ return zephyr_disp_flush;
+}
+
+void *get_vdb_write(void)
+{
+ return zephyr_vdb_write;
+}
+
+void *get_round_func(void)
+{
+ return NULL;
+}
diff --git a/lib/gui/lvgl/lvgl_color_8.c b/lib/gui/lvgl/lvgl_color_8.c
new file mode 100644
index 0000000..170b788
--- /dev/null
+++ b/lib/gui/lvgl/lvgl_color_8.c
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr.h>
+#include <lvgl.h>
+#include "lvgl_color.h"
+
+#if CONFIG_LVGL_BITS_PER_PIXEL == 0
+
+static void zephyr_disp_flush(s32_t x1, s32_t y1, s32_t x2, s32_t y2,
+ const lv_color_t *color_p)
+{
+ u16_t w = x2 - x1 + 1;
+ u16_t h = y2 - y1 + 1;
+ struct display_buffer_descriptor desc;
+
+ desc.buf_size = w * h;
+ desc.width = w;
+ desc.pitch = w;
+ desc.height = h;
+ display_write(lvgl_display_dev, x1, y1, &desc, (void *) color_p);
+
+ lv_flush_ready();
+}
+
+#define zephyr_vdb_write NULL
+
+#else
+
+#error "Unsupported pixel format conversion"
+
+#endif /* CONFIG_LVGL_BITS_PER_PIXEL */
+
+void *get_disp_flush(void)
+{
+ return zephyr_disp_flush;
+}
+
+void *get_vdb_write(void)
+{
+ return zephyr_vdb_write;
+}
+
+void *get_round_func(void)
+{
+ return NULL;
+}
diff --git a/lib/gui/lvgl/lvgl_fs.c b/lib/gui/lvgl/lvgl_fs.c
new file mode 100644
index 0000000..a4edb97
--- /dev/null
+++ b/lib/gui/lvgl/lvgl_fs.c
@@ -0,0 +1,243 @@
+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <lvgl.h>
+#include <zephyr.h>
+#include <fs.h>
+
+/* Stub for LVGL ufs (ram based FS) init function
+ * as we use Zephyr FS API instead
+ */
+void lv_ufs_init(void)
+{
+}
+
+bool lvgl_fs_ready(void)
+{
+ return true;
+}
+
+static lv_fs_res_t errno_to_lv_fs_res(int err)
+{
+ switch (err) {
+ case 0:
+ return LV_FS_RES_OK;
+ case -EIO:
+ /*Low level hardware error*/
+ return LV_FS_RES_HW_ERR;
+ case -EBADF:
+ /*Error in the file system structure */
+ return LV_FS_RES_FS_ERR;
+ case -ENOENT:
+ /*Driver, file or directory is not exists*/
+ return LV_FS_RES_NOT_EX;
+ case -EFBIG:
+ /*Disk full*/
+ return LV_FS_RES_FULL;
+ case -EACCES:
+ /*Access denied. Check 'fs_open' modes and write protect*/
+ return LV_FS_RES_DENIED;
+ case -EBUSY:
+ /*The file system now can't handle it, try later*/
+ return LV_FS_RES_BUSY;
+ case -ENOMEM:
+ /*Not enough memory for an internal operation*/
+ return LV_FS_RES_OUT_OF_MEM;
+ case -EINVAL:
+ /*Invalid parameter among arguments*/
+ return LV_FS_RES_INV_PARAM;
+ default:
+ return LV_FS_RES_UNKNOWN;
+ }
+}
+
+static lv_fs_res_t lvgl_fs_open(void *file, const char *path,
+ lv_fs_mode_t mode)
+{
+ int err;
+
+ err = fs_open((struct fs_file_t *)file, path);
+ return errno_to_lv_fs_res(err);
+}
+
+static lv_fs_res_t lvgl_fs_close(void *file)
+{
+ int err;
+
+ err = fs_close((struct fs_file_t *)file);
+ return LV_FS_RES_NOT_IMP;
+}
+
+static lv_fs_res_t lvgl_fs_remove(const char *path)
+{
+ int err;
+
+ err = fs_unlink(path);
+ return errno_to_lv_fs_res(err);
+}
+
+static lv_fs_res_t lvgl_fs_read(void *file, void *buf, u32_t btr,
+ u32_t *br)
+{
+ int err;
+
+ err = fs_read((struct fs_file_t *)file, buf, btr);
+ if (err > 0) {
+ if (br != NULL) {
+ *br = err;
+ }
+ err = 0;
+ } else if (br != NULL) {
+ *br = 0;
+ }
+ return errno_to_lv_fs_res(err);
+}
+
+static lv_fs_res_t lvgl_fs_write(void *file, const void *buf, u32_t btw,
+ u32_t *bw)
+{
+ int err;
+
+ err = fs_write((struct fs_file_t *)file, buf, btw);
+ if (err == btw) {
+ if (bw != NULL) {
+ *bw = btw;
+ }
+ err = 0;
+ } else if (err < 0) {
+ if (bw != NULL) {
+ *bw = 0;
+ }
+ } else {
+ if (bw != NULL) {
+ *bw = err;
+ }
+ err = -EFBIG;
+ }
+ return errno_to_lv_fs_res(err);
+}
+
+static lv_fs_res_t lvgl_fs_seek(void *file, u32_t pos)
+{
+ int err;
+
+ err = fs_seek((struct fs_file_t *)file, pos, FS_SEEK_SET);
+ return errno_to_lv_fs_res(err);
+}
+
+static lv_fs_res_t lvgl_fs_tell(void *file, u32_t *pos_p)
+{
+ *pos_p = fs_tell((struct fs_file_t *)file);
+ return LV_FS_RES_OK;
+}
+
+static lv_fs_res_t lvgl_fs_trunc(void *file)
+{
+ int err;
+ off_t length;
+
+ length = fs_tell((struct fs_file_t *) file);
+ ++length;
+ err = fs_truncate((struct fs_file_t *)file, length);
+ return errno_to_lv_fs_res(err);
+}
+
+static lv_fs_res_t lvgl_fs_size(void *file, u32_t *fsize)
+{
+ int err;
+ off_t org_pos;
+
+ /* LVGL does not provided path but pointer to file struct as such
+ * we can not use fs_stat, instead use a combination of fs_tell and
+ * fs_seek to get the files size.
+ */
+
+ org_pos = fs_tell((struct fs_file_t *) file);
+
+ err = fs_seek((struct fs_file_t *) file, 0, FS_SEEK_END);
+ if (err != 0) {
+ *fsize = 0;
+ return errno_to_lv_fs_res(err);
+ }
+
+ *fsize = fs_tell((struct fs_file_t *) file) + 1;
+
+ err = fs_seek((struct fs_file_t *) file, org_pos, FS_SEEK_SET);
+
+ return errno_to_lv_fs_res(err);
+}
+
+static lv_fs_res_t lvgl_fs_rename(const char *from, const char *to)
+{
+ int err;
+
+ err = fs_rename(from, to);
+ return errno_to_lv_fs_res(err);
+}
+
+static lv_fs_res_t lvgl_fs_free(u32_t *total_p, u32_t *free_p)
+{
+ /* We have no easy way of telling the total file system size.
+ * Zephyr can only return this information per mount point.
+ */
+ return LV_FS_RES_NOT_IMP;
+}
+
+static lv_fs_res_t lvgl_fs_dir_open(void *dir, const char *path)
+{
+ int err;
+
+ err = fs_opendir((struct fs_dir_t *)dir, path);
+ return errno_to_lv_fs_res(err);
+}
+
+static lv_fs_res_t lvgl_fs_dir_read(void *dir, char *fn)
+{
+ /* LVGL expects a string as return parameter but the format of the
+ * string is not documented.
+ */
+ return LV_FS_RES_NOT_IMP;
+}
+
+static lv_fs_res_t lvgl_fs_dir_close(void *dir)
+{
+ int err;
+
+ err = fs_closedir((struct fs_dir_t *)dir);
+ return errno_to_lv_fs_res(err);
+}
+
+
+void lvgl_fs_init(void)
+{
+ lv_fs_drv_t fs_drv;
+
+ memset(&fs_drv, 0, sizeof(lv_fs_drv_t));
+
+ fs_drv.file_size = sizeof(struct fs_file_t);
+ fs_drv.rddir_size = sizeof(struct fs_dir_t);
+ fs_drv.letter = '/';
+ fs_drv.ready = lvgl_fs_ready;
+
+ fs_drv.open = lvgl_fs_open;
+ fs_drv.close = lvgl_fs_close;
+ fs_drv.remove = lvgl_fs_remove;
+ fs_drv.read = lvgl_fs_read;
+ fs_drv.write = lvgl_fs_write;
+ fs_drv.seek = lvgl_fs_seek;
+ fs_drv.tell = lvgl_fs_tell;
+ fs_drv.trunc = lvgl_fs_trunc;
+ fs_drv.size = lvgl_fs_size;
+ fs_drv.rename = lvgl_fs_rename;
+ fs_drv.free = lvgl_fs_free;
+
+ fs_drv.dir_open = lvgl_fs_dir_open;
+ fs_drv.dir_read = lvgl_fs_dir_read;
+ fs_drv.dir_close = lvgl_fs_dir_close;
+
+ lv_fs_add_drv(&fs_drv);
+}
+
diff --git a/lib/gui/lvgl/lvgl_fs.h b/lib/gui/lvgl/lvgl_fs.h
new file mode 100644
index 0000000..02a3732
--- /dev/null
+++ b/lib/gui/lvgl/lvgl_fs.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_LIB_GUI_LVGL_LVGL_FS_H_
+#define ZEPHYR_LIB_GUI_LVGL_LVGL_FS_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void lvgl_fs_init(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ZEPHYR_LIB_GUI_LVGL_LVGL_FS_H */
diff --git a/lib/gui/lvgl/lvgl_mem.h b/lib/gui/lvgl/lvgl_mem.h
new file mode 100644
index 0000000..9b6c552
--- /dev/null
+++ b/lib/gui/lvgl/lvgl_mem.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#ifndef ZEPHYR_LIB_GUI_LVGL_MEM_H_
+#define ZEPHYR_LIB_GUI_LVGL_MEM_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+
+void *lvgl_malloc(size_t size);
+
+void lvgl_free(void *ptr);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ZEPHYR_LIB_GUI_LVGL_MEM_H_i */
diff --git a/lib/gui/lvgl/lvgl_mem_kernel.c b/lib/gui/lvgl/lvgl_mem_kernel.c
new file mode 100644
index 0000000..52030f9
--- /dev/null
+++ b/lib/gui/lvgl/lvgl_mem_kernel.c
@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "lvgl_mem.h"
+#include <zephyr.h>
+#include <init.h>
+#include <misc/mempool.h>
+
+K_MEM_POOL_DEFINE(lvgl_mem_pool,
+ CONFIG_LVGL_MEM_POOL_MIN_SIZE,
+ CONFIG_LVGL_MEM_POOL_MAX_SIZE,
+ CONFIG_LVGL_MEM_POOL_NUMBER_BLOCKS, 4);
+
+void *lvgl_malloc(size_t size)
+{
+ return k_mem_pool_malloc(&lvgl_mem_pool, size);
+}
+
+void lvgl_free(void *ptr)
+{
+ k_free(ptr);
+}
diff --git a/lib/gui/lvgl/lvgl_mem_user.c b/lib/gui/lvgl/lvgl_mem_user.c
new file mode 100644
index 0000000..8464aba
--- /dev/null
+++ b/lib/gui/lvgl/lvgl_mem_user.c
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2018 Jan Van Winkel <jan.van_winkel@dxplore.eu>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "lvgl_mem.h"
+#include <zephyr.h>
+#include <init.h>
+#include <misc/mempool.h>
+
+K_MUTEX_DEFINE(lvgl_mem_pool_mutex);
+SYS_MEM_POOL_DEFINE(lvgl_mem_pool, &lvgl_mem_pool_mutex,
+ CONFIG_LVGL_MEM_POOL_MIN_SIZE,
+ CONFIG_LVGL_MEM_POOL_MAX_SIZE,
+ CONFIG_LVGL_MEM_POOL_NUMBER_BLOCKS, 4, .data);
+
+void *lvgl_malloc(size_t size)
+{
+ return sys_mem_pool_alloc(&lvgl_mem_pool, size);
+}
+
+void lvgl_free(void *ptr)
+{
+ sys_mem_pool_free(ptr);
+}
+
+static int lvgl_mem_pool_init(struct device *unused)
+{
+#ifdef CONFIG_USERSPACE
+ k_object_access_all_grant(&lvgl_mem_pool_mutex);
+#endif
+ sys_mem_pool_init(&lvgl_mem_pool);
+ return 0;
+}
+
+SYS_INIT(lvgl_mem_pool_init, APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);
