mlearning/tflite-micro: enable Makefile hello-world and usable tflm

[Abhishekmishra2808]

Summary

Makefile tflm_hello was CMake-only, tflm skipped AllocateTensors() and registered INT8-only ops, syslog stripped TFLM strings unless debug was on, and Darknet ignored CONFIG_DARKNET_YOLO_VER. This builds hello-world from Makefile, makes tflm usable, keeps syslog strings without debug, and fetches Darknet from the Kconfig version.

Impact

• CONFIG_TFLITEMICRO_HELLOWORLD now produces tflm_hello for Makefile and CMake.
• tflm requires -o only with -C; operator set is generic (float and quantized).
• TF_LITE_STRIP_ERROR_STRINGS is not set when syslog is enabled without debug.
• Darknet Makefile uses CONFIG_DARKNET_YOLO_VER.

Testing

I confirm that changes are verified on local setup and works as intended:

• Build Host(s): Linux (WSL2), x86_64, GCC 13.3.0
• Target(s): sim:tflm Makefile build

✔️ All checks pass.

Register: hello
Register: tflm
Register: tflm_hello
Register: dd
Register: nsh
Register: sh
Register: init

CXX:  tflite-micro/tensorflow/lite/micro/examples/hello_world/hello_world_test.cc
CXX:  tflm_tool.cc
IN: /home/abhishek/nuttx-apps/libapps.a -> staging/libapps.a
LD:  nuttx
Pac SIM with dynamic libs..
'/lib/x86_64-linux-gnu/libz.so.1' -> 'sim-pac/libs/libz.so.1'
'/lib/x86_64-linux-gnu/libstdc++.so.6' -> 'sim-pac/libs/libstdc++.so.6'
'/lib/x86_64-linux-gnu/libm.so.6' -> 'sim-pac/libs/libm.so.6'
'/lib/x86_64-linux-gnu/libc.so.6' -> 'sim-pac/libs/libc.so.6'
'/lib/x86_64-linux-gnu/libgcc_s.so.1' -> 'sim-pac/libs/libgcc_s.so.1'
'/lib64/ld-linux-x86-64.so.2' -> 'sim-pac/ld-linux-x86-64.so.2'
SIM elf with dynamic libs archive in nuttx.tgz

nsh> tflm -h

Utility to use tflite micro on nuttx.
[ -C       ] Compile tflite model into c++ codes.
[ -E       ] Do once evaluation (for profiling).
[ -i <str> ] Readable model file path.
[ -o <str> ] Writable c++ file path (required with -C).
[ -p <str> ] Prefix of compiled code.
[ -a <int> ] Arena size (mempool).
[ -h       ] Print this message.
nsh> tflm_hello
0 (id=0): size=16, offset=0, first_used=0 last_used=1
1 (id=1): size=64, offset=64, first_used=1 last_used=2
2 (id=2): size=64, offset=0, first_used=2 last_used=3
3 (id=3): size=16, offset=64, first_used=3 last_used=3
 0: 0000000000...................................................................... (1k)
 1: 0000000000..............................1111111111111111111111111111111111111111 (1k)
 2: 22222222222222222222222222222222222222221111111111111111111111111111111111111111 (1k)
 3: 22222222222222222222222222222222222222223333333333.............................. (1k)

"Unique Tag","Total ticks across all events with that tag."
FULLY_CONNECTED, 0
"total number of ticks", 0

[RecordingMicroAllocator] Arena allocation total 2504 bytes
[RecordingMicroAllocator] Arena allocation head 128 bytes
[RecordingMicroAllocator] Arena allocation tail 2376 bytes
[RecordingMicroAllocator] 'TfLiteEvalTensor data' used 240 bytes with alignment overhead (requested 240 bytes for 10 allocations)
[RecordingMicroAllocator] 'Persistent TfLiteTensor data' used 224 bytes with alignment overhead (requested 224 bytes for 2 tensors)
[RecordingMicroAllocator] 'Persistent buffer data' used 1144 bytes with alignment overhead (requested 1100 bytes for 7 allocations)
[RecordingMicroAllocator] 'NodeAndRegistration struct' used 264 bytes with alignment overhead (requested 264 bytes for 3 NodeAndRegistration structs)
0 (id=0): size=16, offset=0, first_used=0 last_used=1
1 (id=1): size=64, offset=64, first_used=1 last_used=2
2 (id=2): size=64, offset=0, first_used=2 last_used=3
3 (id=3): size=16, offset=64, first_used=3 last_used=3
 0: 0000000000...................................................................... (1k)
 1: 0000000000..............................1111111111111111111111111111111111111111 (1k)
 2: 22222222222222222222222222222222222222221111111111111111111111111111111111111111 (1k)
 3: 22222222222222222222222222222222222222223333333333.............................. (1k)
0 (id=0): size=16, offset=16, first_used=0 last_used=1
1 (id=1): size=16, offset=0, first_used=1 last_used=2
2 (id=2): size=16, offset=16, first_used=2 last_used=3
3 (id=3): size=16, offset=0, first_used=3 last_used=3
 0: ................0000000000000000................................................ (1k)
 1: 11111111111111110000000000000000................................................ (1k)
 2: 11111111111111112222222222222222................................................ (1k)
 3: 33333333333333332222222222222222................................................ (1k)
~~~ALL TESTS PASSED~~~

nsh> poweroff

[acassis]

@Abhishekmishra2808 please help to create a google documentation explaining how to test it.