FelipeMdeO opened a new pull request, #3529:
URL: https://github.com/apache/nuttx-apps/pull/3529
## Summary
This PR adds a new RNG90 example application in apps.
Changes included:
- New RNG90 example source: examples/rng90/rng90_main.c
- Build integration files for Make and CMake:
- examples/rng90/Makefile
- examples/rng90/Make.defs
- examples/rng90/CMakeLists.txt
- Kconfig integration:
- examples/rng90/Kconfig
The example opens the RNG90 character device, reads random bytes, and prints
hex output. It supports optional command-line arguments for device path and
requested byte count.
How to enable via Kconfig:
- In nuttx (driver side), enable: `Device Drivers -> Cryptographic Device
Drivers -> RNG90` (`CONFIG_DEV_RNG90=y`)
- In apps, enable: `Application Configuration -> Examples -> Microchip RNG90
TRNG example` (`CONFIG_EXAMPLES_RNG90=y`)
- Optional app settings:
- `CONFIG_EXAMPLES_RNG90_PROGNAME`
- `CONFIG_EXAMPLES_RNG90_DEVPATH`
- `CONFIG_EXAMPLES_RNG90_PRIORITY`
- `CONFIG_EXAMPLES_RNG90_STACKSIZE`
## Impact
- Adds a new user-space example under apps/examples.
- No changes to existing examples behavior.
- Requires RNG90 driver support in nuttx (CONFIG_DEV_RNG90) to run.
## Testing
Host:
- macOS
Target:
- esp32c3-devkit
- RNG90 connected and enabled
- Serial settings: 115200 8N1
Build/flash used for validation:
- make -j8
- make flash ESPTOOL_PORT=/dev/tty.wchusbserial1140
Hardware validation transcript:
```text
nsh> uname -a
NuttX 12.6.0-RC1 4423760152-dirty Jun 7 2026 23:00:02 risc-v esp32c3-devkit
nsh> ls /dev/rng0
/dev/rng0
nsh> rng90
RNG90 example: device /dev/rng0
Read 32 random byte(s):
4f fc 96 27 91 99 95 32 90 b4 46 3c 3d a0 4c e9
ce 86 6d 41 7e a4 ab 02 4f 3a fe 34 ef c8 d0 15
nsh> rng90 /dev/rng0 16
RNG90 example: device /dev/rng0
Read 16 random byte(s):
82 6e 45 0b 1c f1 df d3 75 32 19 32 eb a5 e6 cc
nsh> rng90 /dev/rng0 64
Invalid count 64, clamping to 32
RNG90 example: device /dev/rng0
Read 32 random byte(s):
8d 8d fb 91 07 01 41 e7 54 e4 8b 77 9a 1d e9 2b
83 55 18 b9 79 0b 26 1c 52 07 56 77 f7 34 aa 77
```
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