FelipeMdeO opened a new pull request, #19056:
URL: https://github.com/apache/nuttx/pull/19056
## Summary
This PR adds support for the Microchip RNG90 in NuttX and documents the
example application.
Changes included:
- RNG90 driver integration in kernel/board flow (device registration and
usage via /dev/rng0).
- ESP32-C3 board configuration updates for RNG90 enablement.
- New user documentation for the RNG90 example at
Documentation/applications/examples/rng90/index.rst, including overview,
configuration, usage, references, and hardware validation transcript.
## Impact
- New hardware feature support: RNG90 TRNG device.
- New board configuration support for esp32c3-devkit.
## Testing
Host:
- macOS
Target:
- esp32c3-devkit
- RNG90 connected and enabled
- Serial port: /dev/cu.wchusbserial140
- Serial settings: 115200 8N1
Build/flash:
- make -j4
- make flash ESPTOOL_PORT=<your device>
Hardware validation transcript:
```text
nsh> uname -a
NuttX 12.6.0-RC1 4130050287-dirty Jun 7 2026 22:11:21 risc-v esp32c3-devkit
nsh> ls /dev/rng0
/dev/rng0
nsh> rng90
RNG90 example: device /dev/rng0
Read 32 random byte(s):
0d b2 71 d1 40 1f 3c 50 52 3d c6 2c a9 74 ec 60
44 ab 67 bb c4 34 1b ac 48 62 fe b9 fd 95 c9 cb
nsh> rng90 /dev/rng0 16
RNG90 example: device /dev/rng0
Read 16 random byte(s):
ef 82 5f b7 41 f1 48 13 5a 41 16 3a 67 1b 90 f2
nsh> rng90 /dev/rng0 64
Invalid count 64, clamping to 32
RNG90 example: device /dev/rng0
Read 32 random byte(s):
bb be 2f 20 7f c8 33 8d 18 90 c8 fb 94 db bc e6
84 41 17 6f 5a be 5a 06 c3 7b f1 30 ac f2 a6 f5
```
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