@KamilTomaszewski Thank you, I will give it a try and will edit the post with the result!

Hi, @Chandasri-G
Yes, multi-threading is possible using SDK-CLI. You can use asymmetrical (ASMP) or symmetrical (SMP) multiprocessing.

@KamilTomaszewski gave a very good answer about multiprocessing in Spresense in the Questions regarding Multiprocessing topic.
Please refer to it to read further details.

You can use the pthreads library when using SMP (symmetric multiprocessing). SMP is controlled by Nuttx, so you just have to enable it and assign how many cores you want to allocate for it.

Let me know if I can help you any further.

@Chandasri-G
I'm glad to hear the issue was resolved!
If you have an idea of what caused the issue or what you did to fix it, please share so we can help other developers in the future 🙂

@KamilTomaszewski
okay. thanks for your reply!!

Hi @Chandasri-G,

The following steps are required to deploy and run a TensorFlow model on a Spresense:

1. Train a model:

Generate a small TensorFlow model that can fit your target device and contains supported operations: https://www.tensorflow.org/lite/microcontrollers/build_convert#operation_support.

Convert to a TensorFlow Lite model using the TensorFlow Lite converter: https://www.tensorflow.org/lite/microcontrollers/build_convert#model_conversion.

Convert to a C byte array using standard tools to store it in a read-only program memory on device: https://www.tensorflow.org/lite/microcontrollers/build_convert#convert_to_a_c_array

2. Run inference on device using the C++ library and process the results.

So first you train your model on your PC. You can use Python for that. However, to run the model on Spresense you must use the TensorFlow Lite Micro library. It is written in C++. To make it easier to use this library on the Spresense SDK we have created a wrapper for this library. It's called TFLM Runtime: https://developer.sony.com/develop/spresense/docs/sdk_developer_guide_en.html#_tflm_runtime

I hope it helps you.

Best Regards,
Kamil Tomaszewski

@KamilTomaszewski Thank you!

@MatBen-0 Some files in the flash memory may be corrupted. Please try to execute the recovery tool: https://developer.sony.com/develop/spresense/developer-tools/spresense-recovery-tool

Best Regards,
Kamil Tomaszewski

Hi @KamilTomaszewski

It worked and solved the issue. Thanks for your help

Thanks

Hi @Jishil3660-0-0-0-0-0-0-0 ,

Could you please try to erase flash: https://developer.sony.com/develop/spresense/docs/sdk_tutorials_en.html#_how_to_erase_flash and flash circuitpython image again? Looks like you wrote some app that made Spresense stuck on it. If you know what could have caused it, let me know.

Best Regards,
Kamil Tomaszewski

Hi @ar22,

Please be aware of these limitations:

SD and SDHC cards are supported, but SDXC cards is not supported. Formats of FAT12, FAT16 and FAT32 are supported, exFAT is not supported. Capacity of up to 32 GB is supported.

Best Regards,
Kamil Tomaszewski

Hi @kr4tr1m,

Do you connect the cable to the main board or to the extension board micro USB port?

Best Regards,
Kamil Tomaszewski

Hi @kamiltomaszewski,

Thank you so much for the quick response!

Hi @kiruthika,

You can try to use a Hardware Serial which is on pins 0 and 1 using Serial2.

Do you have operating voltage set on Spresense to 3.3V? See: https://developer.sony.com/develop/spresense/docs/hw_docs_en.html#_setting_operating_voltage

Best Regards,
Kamil Tomaszewski

Thank you so much @KamilTomaszewski, your example worked & it helped me a lot.

Hi @kamiltomaszewski,
Thank you, it worked,made my day.

Hi @kamiltomaszewski thank you so much.

Thank you @KamilTomaszewski, your suggestion worked & it helped me a lot.

Hi @kamiltomaszewski,
This solution did worked, thank you for your time and answer.

Hi @tsg-0-0-0-0-0-0-0 ,

You can use ASMP or SMP. You can also use them together.

Information about ASMP can be found here: https://developer.sony.com/develop/spresense/docs/sdk_developer_guide_en.html#_asmp_framework. This is a framework that provides initialization and communication between cores. ASMP does not use NuttX. Example: https://github.com/sonydevworld/spresense/tree/master/examples/asmp/

Information about SMP you can find here: https://developer.sony.com/develop/spresense/docs/sdk_tutorials_en.html#_feature_smp and https://nuttx.apache.org/docs/latest/reference/os/smp.html. SMP is controlled by NuttX so you just have to enable it and assign how many cores you want to allocate for SMP. Example: https://github.com/sonydevworld/spresense-nuttx-apps/tree/1a501330f462e8d433c31fd6f6b7822a70ed0c26/testing/smp

You can use ASMP and SMP together. You can see how this works using example/smp_asmp config.

Best Regards,
Kamil Tomaszewski