yf13 commented on PR #840:
URL: https://github.com/apache/nuttx-apps/pull/840#issuecomment-3095292242
Based on latest micropython master, I added an NuttX app `interpreters/mpy`
like below:
```sh
$ lt interpreters/mpy/
-rw-rw-r-- 1 yf yf 1536 Jul 21 11:09 Kconfig
-rw-rw-r-- 1 yf yf 3646 Jul 21 12:07 CMakeLists.txt
-rw-rw-r-- 1 yf yf 1049 Jul 21 12:22 mpconfigport.h
-rw-rw-r-- 1 yf yf 1468 Jul 21 12:22 main.c
```
Here `main.c` and `mpconfigport.h` are copied from micropython embedding
example. The `mpconfigport.h` is enriched to select architecture per NuttX
configs.
This same NuttX app can run on QEMU rv32 target with all NuttX operation
modes:
- The FLAT mode has no memory protection at all.
- The PROTECTED mode uses MPU to isolate apps from NuttX kernel.
- The KERNEL mode further uses MMU to isolate Apps and the kernel.
Here is a session log from the KERNEL mode:
```sh
$ size nuttx bin/mpy
text data bss dec hex filename
113187 421 24048 137656 219b8 nuttx
110434 4 8588 119026 1d0f2 bin/mpy
$ qemu-system-riscv32 -M virt,aclint=on -semihosting -nographic -bios nuttx
ABC
NuttShell (NSH)
nsh> cat /proc/version
NuttX version 0.0.0 3ba55aa7-dirty Jul 21 2025 12:08:03 rv-virt/nsbi-dirty
nsh> ls -l /system/bin/mpy
-rwxrwxrwx 120572 /system/bin/mpy
nsh> free
total used free maxused maxfree nused
nfree
Kmem: 4166652 8028 4158624 20448 4156376 25
4
Page: 4194304 602112 3592192 3592192
nsh> mpy
hello world! [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]eol
iter 00000000
iter 00000001
iter 00000002
iter 00000003
iter 00000004
iter 00000005
iter 00000006
iter 00000007
iter 00000008
iter 00000009
caught exception ZeroDivisionError('divide by zero',)
run GC collect
finish
nsh> free
total used free maxused maxfree nused
nfree
Kmem: 4166652 8028 4158624 20448 4156376 25
4
Page: 4194304 602112 3592192 3592192
```
@dpgeorge, I am wondering if this is the right approach?
Of course there are still a lot to do before we can have a meaningful
integration:
- Micropython side to enhance embeding with more features, ideally to have
REPL.
- The port needs use more NuttX services like POSIX threads, file system,
drivers, connectivity stacks etc.
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