[GitHub] [nuttx-apps] lupyuen opened a new pull request, #1494: examples/lvgldemo: Select default demo

[GitBox]

lupyuen opened a new pull request, #1494:
URL: https://github.com/apache/nuttx-apps/pull/1494

   ## Summary
   
   The LVGL Example App `lvgldemo` currently requires 1 argument: the name of 
the demo to show.
   
   ```bash
   lvgldemo widgets
   ```
   
   In this PR, we propose to make the argument optional if there is only one 
demo configured. This will enable PINE64 PinePhone to boot straight into 
`lvgldemo` and auto-start the LVGL App, without entering any `nsh` commands.
   
   ### Modified Files
   
   `examples/lvgldemo/lvgldemo.c`: If no arguments are specified and only 1 
demo exists, select the demo
   
   ## Impact
   
   With this PR, `lvgldemo` will no longer require an argument if there is only 
one demo configured. So this command:
   
   ```bash
   lvgldemo
   ```
   
   Is equivalent to `lvgldemo widgets` if there is only one demo `widgets` 
configured.
   
   If there is more than one demo configured, or if an argument is provided, 
`lvgldemo` will work the same way as before.
   
   ## Testing
   
   We successfully tested `lvgldemo` with a Single Configured Demo:
   
   ```bash
   lvgldemo
     [Shows Widgets Demo]
   lvgldemo widgets
     [Shows Widgets Demo]
   ```
   
   [(See the Test 
Log)](https://gist.github.com/lupyuen/b01b325d91c9ad72a0ec88e057e982a8)
   
   And we tested `lvgldemo` with Multiple Configured Demos:
   
   ```bash
   lvgldemo
     [Shows List of Configured Demos and exits]
   lvgldemo music
     [Shows Music Demo]
   lvgldemo stress
     [Shows Stress Demo]
   ```
   
   [(See the Test 
Log)](https://gist.github.com/lupyuen/b96ed96db295334db1cfabf461efad83)
   
   Also we verified that PinePhone boots successfully to the `lvgldemo widgets` 
demo automatically, without entering any `nsh` commands. We configured the 
PinePhone build as follows:
   
   ```bash
   tools/configure.sh pinephone:lvgl
   make menuconfig
   ```
   
   1. RTOS Features > Tasks and Scheduling
   
      -  Set "Application entry point" to `lvgldemo_main`
   
         (INIT_ENTRYPOINT)
   
      - Set "Application entry name" to `lvgldemo_main`
   
        (INIT_ENTRYNAME)
   
   2. Application Configuration > NSH Library
   
       - Disable "Have architecture-specific initialization"
   
         (NSH_ARCHINIT)
   


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