Tab5 audio, I2C improvements, UiDensity moved to lvgl-module and cleanup (#506)

- UiDensity moved to lvgl-module
- Deleted tt_hal and tt_hal_gpio (breaks apps, but will fix those right after merging)
- Added I2C 8 bit register operations
- Added device.properties to simulator
- Improved Tab5 hardware init, implement audio
- Add README.md to kernel

Modules/lvgl-module/CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.20)
 
 # ####################################
-# Read properties
+# Read sdkconfig properties
 # ####################################
 
 include("${CMAKE_CURRENT_LIST_DIR}/../../Buildscripts/properties.cmake")
@@ -33,6 +33,34 @@ message(" - statusbar: ${statusbar_symbol_size}")
 message(" - launcher: ${launcher_symbol_size}")
 message(" - shared: ${shared_symbol_size}")
 
+# ####################################
+# Read device properties
+# ####################################
+
+# Load device.properties as a map
+get_property(TACTILITY_DEVICE_ID GLOBAL PROPERTY TACTILITY_DEVICE_ID)
+READ_PROPERTIES_TO_MAP(
+    "${CMAKE_CURRENT_LIST_DIR}/../../Devices/${TACTILITY_DEVICE_ID}/device.properties"
+    device_properties
+)
+# Read UI density
+GET_VALUE_FROM_MAP(device_properties "[lvgl]uiDensity" ui_density)
+# Define UiDensity enum value
+if (ui_density)
+    if (ui_density STREQUAL "default")
+        set(ui_density_variable "LVGL_UI_DENSITY_DEFAULT")
+    elseif (ui_density STREQUAL "compact")
+        set(ui_density_variable "LVGL_UI_DENSITY_COMPACT")
+    else ()
+        message(FATAL_ERROR "Invalid [lvgl]uiDensity: '${ui_density}'. Must be either 'default' or 'compact'")
+    endif ()
+    message("UI density set to '${ui_density}' via properties")
+else ()
+    set(ui_density "default")
+    set(ui_density_variable "LVGL_UI_DENSITY_DEFAULT")
+    message("UI density set to default: ${ui_density}")
+endif ()
+
 # ####################################
 # Create module
 # ####################################
@@ -66,17 +94,22 @@ tactility_add_module(lvgl-module
 tactility_get_module_name("lvgl-module" MODULE_NAME)
 
 target_compile_definitions(${MODULE_NAME} PUBLIC
+    # Ensure it loads <lvgl.h>
     "-DLV_LVGL_H_INCLUDE_SIMPLE"
+    # Text fonts
     "-DTT_LVGL_TEXT_FONT_SMALL_SIZE=${font_size_small}"
     "-DTT_LVGL_TEXT_FONT_SMALL_SYMBOL=lv_font_montserrat_${font_size_small}"
     "-DTT_LVGL_TEXT_FONT_DEFAULT_SIZE=${font_size_default}"
     "-DTT_LVGL_TEXT_FONT_DEFAULT_SYMBOL=lv_font_montserrat_${font_size_default}"
     "-DTT_LVGL_TEXT_FONT_LARGE_SIZE=${font_size_large}"
     "-DTT_LVGL_TEXT_FONT_LARGE_SYMBOL=lv_font_montserrat_${font_size_large}"
+    # Icon fonts
     "-DTT_LVGL_STATUSBAR_FONT_ICON_SIZE=${statusbar_symbol_size}"
     "-DTT_LVGL_STATUSBAR_FONT_ICON_SYMBOL=material_symbols_statusbar_${statusbar_symbol_size}"
     "-DTT_LVGL_LAUNCHER_FONT_ICON_SIZE=${launcher_symbol_size}"
     "-DTT_LVGL_LAUNCHER_FONT_ICON_SYMBOL=material_symbols_launcher_${launcher_symbol_size}"
     "-DTT_LVGL_SHARED_FONT_ICON_SIZE=${shared_symbol_size}"
     "-DTT_LVGL_SHARED_FONT_ICON_SYMBOL=material_symbols_shared_${shared_symbol_size}"
+    # UiDensity
+    "-DTT_LVGL_UI_DENSITY=${ui_density_variable}"
 )

Modules/lvgl-module/include/tactility/lvgl_module.h

@@ -16,6 +16,14 @@ extern "C" {
 #include <stdint.h>
 #include <stdbool.h>
 
+/** Affects LVGL widget style */
+enum UiDensity {
+    /** Ideal for very small non-touch screen devices (e.g. Waveshare S3 LCD 1.3") */
+    LVGL_UI_DENSITY_COMPACT,
+    /** Nothing was changed in the LVGL UI/UX */
+    LVGL_UI_DENSITY_DEFAULT
+};
+
 /**
  * @brief The LVGL module instance.
  */
@@ -86,6 +94,14 @@ void lvgl_unlock(void);
  */
 bool lvgl_is_running(void);
 
+/**
+ * @brief Gets the desired UI density for the target hardware.
+ * The density is defined in the `device.properties` of a hardware device.
+ * This setting is read by CMakeLists.txt and passed as a target compile definition of the LVGL module.
+ * @return the UI density
+ */
+enum UiDensity lvgl_get_ui_density(void);
+
 #ifdef __cplusplus
 }
 #endif

Modules/lvgl-module/source/arch/lvgl_posix.c

@@ -10,7 +10,7 @@
 
 #include <lvgl.h>
 
-#include "tactility/lvgl_module.h"
+#include <tactility/lvgl_module.h>
 
 extern struct LvglModuleConfig lvgl_module_config;
 

Modules/lvgl-module/source/module.c

@@ -60,6 +60,10 @@ bool lvgl_is_running() {
     return is_running;
 }
 
+enum UiDensity lvgl_get_ui_density(void) {
+    return TT_LVGL_UI_DENSITY;
+}
+
 struct Module lvgl_module = {
     .name = "lvgl",
     .start = start,

Modules/lvgl-module/source/symbols.c

@@ -11,6 +11,7 @@ const struct ModuleSymbol lvgl_module_symbols[] = {
     DEFINE_MODULE_SYMBOL(lvgl_try_lock),
     DEFINE_MODULE_SYMBOL(lvgl_unlock),
     DEFINE_MODULE_SYMBOL(lvgl_is_running),
+    DEFINE_MODULE_SYMBOL(lvgl_get_ui_density),
     // lvgl_fonts
     DEFINE_MODULE_SYMBOL(lvgl_get_shared_icon_font),
     DEFINE_MODULE_SYMBOL(lvgl_get_shared_icon_font_height),