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Weining Lu
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README.md
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README.md
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#User Guide
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#1.Overview
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Littlevgl is an Open-source Embedded GUI Library. We definde an UI APP, and it can be running in 3 scenarios.
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1. Native Linux. The App code built into Linux executables.
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2. WASM VM for Different platform. WASM VM and native extension being built into Linux and Zephyr platforms. With WASM VM inside, many WASM APP can run on top of it.
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3. WASM APP. This kind of binary can be run on WASM VM.
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##Folder structure
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├── build.sh **build script, will create build and out folder.**
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├── LICENCE.txt
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├── UI.JPG **UI appearence.**
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├── user_guide.md **User Guide.**
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### 1. vgl-native-ui-app
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Littlevgl graphics app has being built into Linux application named "vgl_native_ui_app", which can directly run on Linux.
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├── vgl-native-ui-app
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│ ├── CMakeLists.txt
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│ ├── lv_drivers **Display and input device driver sources.**
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│ └── main.c **UI app logic.**
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### 2. vgl-wasm-runtime
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Wasm micro-runtime and littlevgl native interface built into Linux application named "littlevgl", where wasm apps can run on it.
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├── vgl-wasm-runtime
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│ ├── CMakeLists.txt
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│ ├── src **Cantains WASM VM initialization adn native extension sources.**
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│ │ ├── display_indev.h **App called methods which are implemented in WASM native.**
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│ │ ├── ext-lib-export.c **WASM exported function**
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│ │ ├── platform **Native method Implementation on different platform.**
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│ │ │ ├── linux **Linux implementation**
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│ │ │ │ ├── display_indev.c
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│ │ │ │ ├── iwasm_main.c
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│ │ │ │ ├── main.c
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│ │ │ │ └── mouse.c
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│ │ │ └── zephyr **Zephyr implementation**
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│ │ │ ├── display.h
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│ │ │ ├── display_ili9340_adafruit_1480.c
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│ │ │ ├── display_ili9340.c
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│ │ │ ├── display_ili9340.h
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│ │ │ ├── display_indev.c
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│ │ │ ├── LICENSE
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│ │ │ ├── XPT2046.c
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│ │ │ └── XPT2046.h
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│ │ └── test_wasm.h
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│ └── zephyr-build **Zephyr project files**
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│ ├── CMakeLists.txt
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│ └── prj.conf
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##Introduction
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###3. wasm-apps
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A wasm app with littlevgl graphics.
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└── wasm-apps
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├── build_wasm_app.sh **Git clone lvgl and build app.**
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├── Makefile_wasm_app **Makefile**
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└── src **source code of UI app.**
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This project aims to demonstrate wasm app management and programming model of WAMR.
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##Build all binaries
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Execute the build.sh script then all binaries including wasm application files would be generated in 'out' directory.
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#2.Install required SDK and libraries.
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##1. 32 bit SDL(simple directmedia layer)
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###a. Use apt-get
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sudo apt-get install libsdl2-dev:i386
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###b. Install from source
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www.libsdl.org
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`./configure C_FLAGS=-m32 CXX_FLAGS=-m32 LD_FLAGS=-m32`
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` ./make`
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`./sudo make install`
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##2. Install EMSDK
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https://emscripten.org/docs/tools_reference/emsdk.html
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##3. Cmake
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CMAKE version above 3.13.1.
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#3.Build & Run
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##1. Build and run on Linux
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###a. Build
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`./build.sh`
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All binaries are in "out", which contains "host_tool", "vgl_native_ui_app", "TestApplet1.wasm" and "vgl_wasm_runtime".
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###b.Run native Linux application
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`./vgl_native_ui_app`
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###c.Run WASM VM Linux applicaton & install WASM APP
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####1. Start vgl_wasm_runtime in server mode
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`./vgl_wasm_runtime -s`
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####2. Install wasm APP
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`./host_tool -i TestApplet1 -f TestApplet1.wasm`
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##2. Build and run on zephyr
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WASM VM and native extension method can be built into zephyr, Then we can install wasm app into STM32.
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###1.Build wasm into Zephyr system
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####a. clone zephyr source code
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`git clone https://github.com/zephyrproject-rtos/zephyr.git`
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####b. copy samples
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`cd zephyr/samples/`
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`cp -a <iwasm_root_dir>projects/littlevgl/vgl-wasm-runtime vgl-wasm-runtime`
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`cd vgl-wasm-runtime/zephyr_build`
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####c. create a link to wamr core
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` ln -s <iwasm_root_dir>/core core`
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####d. build source code
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We use nucleo_f767zi, which is almost the same as nucleo_f746zg, except SRAM size in DTS.
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Duplicate zephyr board support of nucleo_f746zg, then change SRAM size to 512KB.
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`mkdir build && cd build`
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`source ../../../../zephyr-env.sh`
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`cmake -GNinja -DBOARD=nucleo_f767ZI ..`
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` ninja flash`
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###2. Test on STM32 NUCLEO_F767ZI with ILI9341 Display with XPT2046 touch.
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####a. Hardware Connetions
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+-------------------+-+------------------+
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|NUCLEO-F767ZI || ILI9341 Display |
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+-------------------+-+------------------+
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| CN7.10 | CLK |
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+-------------------+-+------------------+
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| CN7.12 | MISO |
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+-------------------+-+------------------+
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| CN7.14 | MOSI |
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+-------------------+-+------------------+
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| CN11.1 | CS1 for ILI9341 |
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+-------------------+-+------------------+
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| CN11.2 | D/C |
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+-------------------+-+------------------+
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| CN11.3 | RESET |
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+-------------------+-+------------------+
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| CN9.25 | PEN interrupt |
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+-------------------+-+------------------+
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| CN9.27 | CS2 for XPT2046|
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+-------------------+-+------------------+
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| CN10.14 | PC UART RX |
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+-------------------+-+------------------+
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| CN11.16 | PC UART RX |
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+-------------------+-+------------------+
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####b. Install wasm app to zephyr using host_tool
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First connect PC and STM32 with UART. Then install use host_tool.
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`./host_tool -D /dev/ttyUSB0 -i TestApplet1 -f TestApplet1.wasm`
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