Initial test with string passing and Rust

Author: alvarowolfx

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch
+node_modules
+*.wasm
+app.wasm.h
+.vscode/

.travis.yml

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+# Continuous Integration (CI) is the practice, in software
+# engineering, of merging all developer working copies with a shared mainline
+# several times a day < https://docs.platformio.org/page/ci/index.html >
+#
+# Documentation:
+#
+# * Travis CI Embedded Builds with PlatformIO
+#   < https://docs.travis-ci.com/user/integration/platformio/ >
+#
+# * PlatformIO integration with Travis CI
+#   < https://docs.platformio.org/page/ci/travis.html >
+#
+# * User Guide for `platformio ci` command
+#   < https://docs.platformio.org/page/userguide/cmd_ci.html >
+#
+#
+# Please choose one of the following templates (proposed below) and uncomment
+# it (remove "# " before each line) or use own configuration according to the
+# Travis CI documentation (see above).
+#
+
+
+#
+# Template #1: General project. Test it using existing `platformio.ini`.
+#
+
+# language: python
+# python:
+#     - "2.7"
+#
+# sudo: false
+# cache:
+#     directories:
+#         - "~/.platformio"
+#
+# install:
+#     - pip install -U platformio
+#     - platformio update
+#
+# script:
+#     - platformio run
+
+
+#
+# Template #2: The project is intended to be used as a library with examples.
+#
+
+# language: python
+# python:
+#     - "2.7"
+#
+# sudo: false
+# cache:
+#     directories:
+#         - "~/.platformio"
+#
+# env:
+#     - PLATFORMIO_CI_SRC=path/to/test/file.c
+#     - PLATFORMIO_CI_SRC=examples/file.ino
+#     - PLATFORMIO_CI_SRC=path/to/test/directory
+#
+# install:
+#     - pip install -U platformio
+#     - platformio update
+#
+# script:
+#     - platformio ci --lib="." --board=ID_1 --board=ID_2 --board=ID_N

assemblyscript/app.ts

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+@external("arduino", "millis")
+declare function millis(): u32;
+
+@external("arduino", "delay")
+declare function delay(ms: u32): void;
+
+@external("arduino", "pinMode")
+declare function pinMode(pin: u32, mode: u32): void;
+
+@external("arduino", "digitalWrite")
+declare function digitalWrite(pin: u32, value: u32): void;
+
+@external("arduino", "getPinLED")
+declare function getPinLED(): u32;
+
+@external("arduino", "serialLog")
+declare function println(output: string): void;
+//declare function println(output: usize, len: i32): void;
+//declare function println(output: string, len: i32): void;
+
+function log(out: string): void {
+  //println(out, out.length)  // <- Only first letter arrives, but lenght is correct
+  println(out);
+  //println(out); // <- Only first letter arrives
+  //String.UTF16.encode(out) // <- Just referencing this crashes
+  //println(changetype<usize>(String.UTF8.encode(out, true)), String.UTF8.byteLength(out, true)); // <- Crash
+  //println(String.UTF8.encode(out, true), String.UTF8.byteLength(out, true)); // <- Crash
+}
+
+const LOW: u32 = 0;
+const HIGH: u32 = 1;
+
+const INPUT: u32 = 0x0;
+const OUTPUT: u32 = 0x1;
+const INPUT_PULLUP: u32 = 0x2;
+
+let LED: u32 = -1;
+
+function setup(): void {
+  LED = getPinLED();
+  pinMode(LED, OUTPUT);
+}
+
+function run(): void {
+  log('From Web Assembly')
+  digitalWrite(LED, HIGH);
+  delay(1000);
+  digitalWrite(LED, LOW);
+  delay(1000);
+}
+
+/*
+ * Entry point
+ */
+export function _start(): void {
+  setup();
+  while (1) run();
+}

assemblyscript/package-lock.json

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+{
+  "name": "wasm-arduino-wifi-app",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "build": "npm run asbuild:optimized && xxd -i app.wasm > app.wasm.h",
+    "asbuild:optimized": "npx asc app.ts -b app.wasm -O3z --runtime full --noAssert --use abort="
+  },
+  "author": "Alvaro Viebrantz",
+  "license": "MIT",
+  "devDependencies": {
+    "as-bind": "^0.1.3",
+    "assemblyscript": "^0.8.1"
+  }
+}

assemblyscript/package.json

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+{
+  "extends": "./node_modules/assemblyscript/std/assembly.json",
+  "include": [
+    "./**/*.ts"
+  ]
+}

assemblyscript/tsconfig.json

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

include/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

lib/README

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+;PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32]
+platform = espressif32
+board = esp32dev
+framework = arduino
+
+monitor_speed = 115200
+
+src_build_flags =  
+  -Dd_m3LogOutput=false
+  -DLED_BUILTIN=5
+  -DESP32
+  -O3 -flto
+  -Wno-unused-function 
+  -Wno-unused-variable 
+  -Wno-unused-parameter 
+  -Wno-missing-field-initializers
+
+lib_deps=
+  #wasm3/wasm3
+  wasm3/wasm3-arduino
+
+#lib_extra_dirs=
+  #.pio/libdeps/esp32/wasm3

platformio.ini

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+#![no_std]
+
+mod arduino_api;
+use arduino_api::*;
+
+static LED: u32 = 5;
+
+fn setup() {
+    pin_mode(LED, OUTPUT);
+}
+
+fn run() {
+    serial_log("Hello from Rust");    
+    digital_write(LED, HIGH);
+    delay(1000);
+    digital_write(LED, LOW);
+    delay(1000);
+}
+
+/*
+ * Entry point
+ */
+
+#[no_mangle]
+pub extern fn _start() {
+    setup();
+    loop {
+        run();
+    }
+}
+
+#[panic_handler]
+fn handle_panic(_: &core::panic::PanicInfo) -> ! {
+    loop {}
+}

rust/app.rs

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+#![allow(dead_code)]
+
+#[link(wasm_import_module = "arduino")]
+extern {
+  #[link_name = "millis"]         fn unsafe_millis() -> u32;
+  #[link_name = "delay"]          fn unsafe_delay(ms: u32);
+  #[link_name = "pinMode"]        fn unsafe_pinMode(pin:u32, mode:u32);
+  #[link_name = "digitalWrite"]   fn unsafe_digitalWrite(pin:u32, value:u32);
+  #[link_name = "serialLog"]      fn unsafe_println(out: *const u8);
+  #[link_name = "getPinLED"]      fn unsafe_getPinLED() -> u32;
+}
+
+pub static LOW:u32  = 0;
+pub static HIGH:u32 = 1;
+
+pub static INPUT:u32          = 0x0;
+pub static OUTPUT:u32         = 0x1;
+pub static INPUT_PULLUP:u32   = 0x2;
+
+pub fn millis         () -> u32              { unsafe { unsafe_millis() } }
+pub fn delay          (ms: u32)              { unsafe { unsafe_delay(ms); } }
+pub fn pin_mode       (pin:u32, mode:u32)    { unsafe { unsafe_pinMode(pin, mode) } }
+pub fn digital_write  (pin:u32, value:u32)   { unsafe { unsafe_digitalWrite(pin, value) } }
+pub fn serial_log     (out: &str)       { 
+  unsafe {     
+    unsafe_println(out.as_bytes().as_ptr() as *const u8)
+  }
+}
+pub fn get_pin_led    () -> u32              { unsafe { unsafe_getPinLED() } }