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Modified TensorFlow Lite Micro Peripherals

This directory provides drivers with generic interfaces to peripherals used with the TFLM examples.

Table of contents

LEDs

Copy from TensorFlow Lite Micro Library for Arduino Examples.

A generic LED API is provided in the led.h header file.

The physical default LED will vary between peripherals and platforms. The GPIO pin that connects to the default LED is defined in the peripherals.h header file.

The generic LED API provides the following functionality:

  • Turning the LED on/off
  • Blinking the LED at an application defined duty cycle and rate

Analog microphone for Pico

This implementation is based on the Microphone Library for Pico, see README_pico_microphone. It requires the Raspberry Pi Pico Arduino core, for all RP2040 boards to be installed.

The original analog_microphone from the Microphone Library for Pico has been modified and adapted to work with Arduino IDE, as follows:

  • Flatten implementation to have all required files in the peripherals directory
  • Convert *.c to *.cpp, including the use of new/delete instead of malloc/free
  • Move code within namespace peripherals {} and namespace {} to match how the overall peripherals implementation approach
  • Ensure the analog_microphone_init() and analog_microphone_start() functions have a return 0 at the end (were missing from the original C implementation)

This peripheral implementation is used by the analog_audio_provider, based on the pico-wake-word implementation. Remember to enable #define ANALOG_MIC in audio_provider.h.

NOTE1: The Raspberry Pi Pico Arduino core, for all RP2040 boards has support for ADCInput API, based on DMA buffering, with similar functionality as provided in analog_microphone from the Microphone Library for Pico. This is not used in the current code, yet.

PDM microphone for Pico

This uses PDM Arduino library based on Microphone Library for Pico

This peripheral implementation is used by the pdm_audio_provider, based on the pico-wake-word implementation. Remember to enable #define PDM_MIC in audio_provider.h.

NOTE2: The Raspberry Pi Pico Arduino core, for all RP2040 boards has support also for I2S API, based on DMA buffering, with similar functionality as provided in pdm_microphone from the Microphone Library for Pico. This is not used in the current code, yet.