SIM

It is possible to run NuttX in a simulator called sim, but some features currently are supported only on Linux host (i.e.: Bluetooth, I2C, SPI, etc).

Using sim you can test many of NuttX features without a supported board. Examples of supported features: Audio, Bluetooth, ELF, I2C, SPI, LVGL, Flash File System, NX Serves, NX Demos, NX Window Manager, ROMFS, Network: TCP, UDP, IP,6LoWPAN, and many more.

Toolchain

All you need is your machine gcc working.

Compiling

All you need to do is select your desired board profile configuration (see: nuttx/sim/sim/sim/configs for the listing) :

 make distclean

 ./tools/configure.sh sim:nsh

 make

Running

When the compilation finishes it will create a nuttx binary, then run it:

 ./nuttx 
login: admin
password: Administrator
User Logged-in!

NuttShell (NSH) NuttX-10.1.0
MOTD: username=admin password=Administrator
nsh> ?
help usage:  help [-v] [<cmd>]

  .         cd        echo      hexdump   mkfatfs   pwd       source    unset     
  [         cp        exec      kill      mkrd      readlink  test      usleep    
  ?         cmp       exit      losetup   mount     rm        time      xd        
  basename  dirname   false     ln        mv        rmdir     true      
  break     dd        free      ls        poweroff  set       uname     
  cat       df        help      mkdir     ps        sleep     umount    

Builtin Apps:
  sh     hello  nsh    
nsh> uname -a
NuttX 10.1.0 508215581f Sep  3 2021 10:47:34 sim sim
nsh>

Running LVGL

It is possible to run the LVGL Demo directly in the NuttX simulator :

 make distclean

 ./tools/configure.sh sim:lvgl_fb

 make -j

 ./nuttx

You should see a window with the touch calibration and then the LVGL demo:

Running VNC Server

NuttX supports a VNC server, so it means even boards without a LCD display could export a display interface over network. Also you can test it on NuttX simulator before getting it working on your board, just follow these steps :

 make distclean

 ./tools/configure.sh sim:vncserver

 make -j

 ./nuttx

Open a new terminal and execute :

 remmina -c vnc://localhost

You should see some squares in different colors displayed in remmina:

{.align-center width="100.0%"}

Running Simulated CAN

The simulator supports CAN support via SocketCAN on the host. The CAN interface of the host must be properly configured:

ip link set can0 type can bitrate 1000000
ip link set can0 up

Virtual CAN interface can be used as well:

ip link add dev can0 type vcan
ifconfig can0 up

Supported Boards

boards//