Creating App¶

In the ecosystem of wio, app is a project that can be executed or uploaded. It is what runs on machines and displays “Hello world”.

Setting up the Project¶

wio create app projectDir

This will create a project in directory projectDir
This application has no platform, framework, and board
- You will need to specify these fields before a project can be built.
- You can create various targets for various configurations.
- For example to create an AVR project:
```
wio create app --platform avr --framework arduino --board uno projectDir
```

Congrats you have created your first wio application. Your project structure will look like this:

projectDir
├── src
├── wio.yml
├── README.md
├── .gitignore

The result of generated wio.yml file:

type: app

project:
  name: projectDir
  version: 0.0.1
  keywords:
  - wio
  - app
  compile_options:
    wio_version: 0.4.0
    default_target: main

targets:
  main:
    src: src

Initialize the App¶

Now you can create main_native.cpp and main_arduino.cpp files and place them in src folder based on their target.

cd projectDir
mkdir src/native
mkdir src/arduino

main_native.cpp file in src/native directory:

#include <iostream>

int main() {
    std::cout << "Hello world!!" << std::endl;
}

main_arduino.cpp file in src/arduino directory:

/**
 * Blink
 *
 * Turns on an LED on for one second,
 *  then off for one second, repeatedly.
 */

#include "Arduino.h"

#ifndef LED_BUILTIN 
#define LED_BUILTIN 13
#endif

void setup() {
    // initialize LED digital pin as an output. 
    pinMode(LED_BUILTIN, OUTPUT);
} 

void loop() {
    // turn the LED on (HIGH is the voltage level) 
    digitalWrite(LED_BUILTIN, HIGH);

    // wait for a second 
    delay(1000);
    
    // turn the LED off by making the voltage LOW
    digitalWrite(LED_BUILTIN, LOW);
    
    // wait for a second 
    delay(1000);
}

Final project structure will look like:

projectDir
└── src
    └── native
        └── main_native.cpp
    └── arduino
        └── main_arduino.cpp
├── wio.yml
├── README.md
├── .gitignore

Building and Executing¶

We have two sets of code that we want to build and run. This is achieved by using targets. We will modify wio.yml file and create a target for both native and arduino code.

wio.yml after update:

type: app

project:
  name: projectDir
  version: 0.0.1
  keywords:
  - wio
  - app
  compile_options:
    wio_version: 0.4.0

targets:
  native:
    src: src/native
    platform: native
  arduino:
    src: src/arduino
    platform: avr
    framework: arduino
    board: uno

If you want to test using a different framework like Cosa or a different board like mega2560, you can create even more targets.

Building each target is very simple:

# native target
wio build native

# arduino target
wio build arduino

To execute each target:

# native
wio run native

# arduino
wio run arduino