wamr Webassembly Micro Runtime

This guides explains how to try WAMR on NuttX.

Install WASI SDK

We need to be able to build WASM programs. This can be done by installing the wasi-sdk as shown in the WAMR guide.

Make sure the installation is reachable via /opt/wasi-sdk on your host, as this is expected by the build script of the WASM hello world sample below.

Building NuttX

We use the sim/wamr config to build WAMR with NuttX. Note that at this writing, the that CMake scripts don't work for this configuration. For now, please use the makefile build instead:

 cd nuttx
 tools/configure.sh sim/wamr
 make -j4
 ls -l nuttx
-rwxrwxr-x 1 yf yf 4176376 Jun 10 08:11 nuttx

This will generate a nutxx binary. Also a WASM sample is available in the folder apps/interpreters/wamr/wamr/product-mini/app-samples/hello-world folder. We build the sample as follows:

 cd apps/interpreters/wamr/wamr/product-mini/app-samples/hello-world
 ./build.sh
 ls -l test.wasm
-rwxrwxr-x 1 yf yf  413 Jun 10 08:18 test.wasm

The test.wasm program should be accessible from NuttX later.

Try WAMR in NSH

Copy the test.wasm to the folder where the nuttx program lives, then run ./nuttx to kick off NuttX and run iwasm /data/test.wasm from NSH:

 ./nuttx

NuttShell (NSH) NuttX-12.4.0
nsh> iwasm /data/test.wasm
Hello world!
buf ptr: 0x1460
buf: 1234
nsh>