Refactor for NuttX

Author: lupyuen

build.sh

@@ -292,7 +292,7 @@ function compile_lvgl {
 
 ## Build the Feature Phone Zig LVGL App for WebAssembly 
 ## TODO: Change ".." to your NuttX Project Directory
-function build_feature_phone {
+function build_feature_phone_wasm {
   zig build-lib \
     --verbose-cimport \
     -target wasm32-freestanding \
@@ -400,8 +400,47 @@ function build_feature_phone {
 
 }
 
+## Compile the Feature Phone Zig LVGL App for Apache NuttX RTOS
+function build_feature_phone_nuttx {
+  ## Compile the Zig LVGL App for PinePhone 
+  ## (armv8-a with cortex-a53)
+  ## TODO: Change ".." to your NuttX Project Directory
+  zig build-obj \
+    --verbose-cimport \
+    -target aarch64-freestanding-none \
+    -mcpu cortex_a53 \
+    \
+    -isystem "../nuttx/include" \
+    -I . \
+    -I "../apps/include" \
+    -I "../apps/graphics/lvgl" \
+    -I "../apps/graphics/lvgl/lvgl/src/core" \
+    -I "../apps/graphics/lvgl/lvgl/src/draw" \
+    -I "../apps/graphics/lvgl/lvgl/src/draw/arm2d" \
+    -I "../apps/graphics/lvgl/lvgl/src/draw/nxp" \
+    -I "../apps/graphics/lvgl/lvgl/src/draw/nxp/pxp" \
+    -I "../apps/graphics/lvgl/lvgl/src/draw/nxp/vglite" \
+    -I "../apps/graphics/lvgl/lvgl/src/draw/sdl" \
+    -I "../apps/graphics/lvgl/lvgl/src/draw/stm32_dma2d" \
+    -I "../apps/graphics/lvgl/lvgl/src/draw/sw" \
+    -I "../apps/graphics/lvgl/lvgl/src/draw/swm341_dma2d" \
+    -I "../apps/graphics/lvgl/lvgl/src/font" \
+    -I "../apps/graphics/lvgl/lvgl/src/hal" \
+    -I "../apps/graphics/lvgl/lvgl/src/misc" \
+    -I "../apps/graphics/lvgl/lvgl/src/widgets" \
+    feature-phone.zig
+
+  ## Copy the compiled Zig LVGL App to NuttX and overwrite `lv_demo_widgets.*.o`
+  ## TODO: Change ".." to your NuttX Project Directory
+  cp lvgltest.o \
+    ../apps/graphics/lvgl/lvgl/demos/widgets/lv_demo_widgets.*.o
+}
+
 ## Build the LVGL App (in Zig) and LVGL Library (in C) for PinePhone and WebAssembly
 build_zig
 
 ## Compile the Feature Phone Zig LVGL App for WebAssembly 
-build_feature_phone
+build_feature_phone_wasm
+
+## Compile the Feature Phone Zig LVGL App for Apache NuttX RTOS
+build_feature_phone_nuttx

feature-phone.js

@@ -125,10 +125,13 @@ canvas.addEventListener("touchend", (e) => {
 function main() {
     console.log("main: start");
     const start_ms = Date.now();
+    const zig = wasm.instance.exports;
+
+    // Init the LVGL Display and Input
+    zig.initDisplay();
 
     // Render the LVGL Widgets in Zig
-    wasm.instance.exports
-        .lv_demo_widgets();
+    zig.lv_demo_widgets();
 
     // Render Loop
     const loop = function() {
@@ -137,8 +140,7 @@ function main() {
         const elapsed_ms = Date.now() - start_ms;
 
         // Handle LVGL Tasks to update the display
-        wasm.instance.exports
-            .handleTimer(elapsed_ms);
+        zig.handleTimer(elapsed_ms);
 
         // Loop to next frame
         window.requestAnimationFrame(loop);

feature-phone.wasm

@@ -21,6 +21,18 @@ pub export fn lv_demo_widgets() void {
     debug("lv_demo_widgets: start", .{});
     defer debug("lv_demo_widgets: end", .{});
 
+    // Create the widgets for display
+    createWidgets() catch |e| {
+        // In case of error, quit
+        std.log.err("createWidgets failed: {}", .{e});
+        return;
+    };
+
+    // JavaScript should call handleTimer periodically to handle LVGL Tasks
+}
+
+/// Init the LVGL Display and Input
+pub export fn initDisplay() void {
     // Create the Memory Allocator for malloc
     memory_allocator = std.heap.FixedBufferAllocator.init(&memory_buffer);
 
@@ -54,15 +66,6 @@ pub export fn lv_demo_widgets() void {
     indev_drv.type = c.LV_INDEV_TYPE_POINTER;
     indev_drv.read_cb = readInput;
     _ = c.register_input(&indev_drv);
-
-    // Create the widgets for display
-    createWidgets() catch |e| {
-        // In case of error, quit
-        std.log.err("createWidgets failed: {}", .{e});
-        return;
-    };
-
-    // JavaScript should call handleTimer periodically to handle LVGL Tasks
 }
 
 /// LVGL Callback Function to Flush Display