Espressif Systems ESP32-LyraTD-SYNA Manual de usuario

ESP32-LyraTD-SYNA

User Guide

Version 1.0

Espressif Systems

About This Guide

This document helps you to get started with the ESP32-LyraTD-SYNA development board.

Release Notes

Documentation Change Notiﬁcation

Espressif provides email notiﬁcations to keep customers updated on changes to

technical documentation. Please subscribe at https://www.espressif.com/en/subscribe.

Certiﬁcation

Download certiﬁcates for Espressif products from https://www.espressif.com/en/

certiﬁcates.!

Date

Version

Release notes

2019.09

V1.0

Initial release.

Table of Contents 
Overview 1................................................................................................................................
1. ESP32-LyraTD-SYNA!1".................................................................................................................
2. Hardware Resources!1"..................................................................................................................
Conﬁguring for AVS 3...............................................................................................................
1. Software Preparation!3".................................................................................................................
2. Hardware Preparation!3"................................................................................................................
3. Flashing the Firmware!4"................................................................................................................
3.1. Driver Installation!4"..........................................................................................................
3.2. Flashing ESP32!4".............................................................................................................
4. Network Conﬁguration!7"...............................................................................................................
4.1. Wi-Fi Networking!7"..........................................................................................................
5. Interactive Function!10"..................................................................................................................
5.1. Voice Recognition!10".......................................................................................................
5.2. Buttons!10".......................................................................................................................
A. Appendix - Schematics 11.......................................................................................................

1.Overview

1. Overview

ESP32-LyraTD-SYNA is one of Espressif’s Audio Development Board based on ESP32

MCU and Synaptics DSP. It is an Acoustic Echo Cancelation (AEC) solution, supporting

voice recognition and voice wake-up. Audio ﬁles in the format of WAV, MP3, AAC, FLAC,

OPUS and OGG can be decoded and encoded without quality loss. It also supports

connection to Amazon’s AVS (Alexa Voice Service), Google's Dialogﬂow and Google's GVA

(Google Voice Assistant).

1.1. ESP32-LyraTD-SYNA

ESP32-LyraTD-SYNA is based on ESP32-WROVER-B, a BT/Wi-Fi combo module, and a

digital signal processor (DSP) that features a two-microphone array for noise reduction and

echo cancelation, as well as a Coder-Decoder (CODEC) that includes two pairs of DACs &

ADCs with high sampling rates.

Figure 1-1. ESP32-LyraTD-SYNA

1.2. Hardware Resources

1. USB Power Port

Provides power supply to the whole system. It is recommended that the system be

connected to a power adapter for sufﬁcient current supply.

2. ESP32-WROVER-B module

This is a powerful, general-purpose, Wi-Fi+BT+BLE dual core MCU module, targeting a

wide variety of applications ranging from low-power sensor networks to the most

demanding tasks, such as voice encoding/decoding, music streaming and runs voice

assistant client SDK.

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1.Overview

3. CX20921 DSP

CX20921 is a dual core, far ﬁeld voice input processor which supports Smart Source

Pickup(SSP) noise suppression and various functionalities such as voice control, voice

search, Voice over Internet Protocol (VOlP) and acoustic echo cancellation (AEC). This

audio DSP is used for wake-word detection. It captures audio data from two external

microphones.

4. CX20721 codec

CX20721 is an audio Coder-Decoder which has integrated AudioSmart Class-D with

2.8W per channel.

5. CP2102N USB-UART Chip

An upgraded version of the CP2102 chip supports USB-to-UART conversion.

6. USB Communication Port

This is a normal USB communication port between PC and ESP32 module.

7. ON-Board microphone

There are two types of microphone connection, on-board and by MIC-IN connector.

8. MIC-IN microphone connector

Supports two external microphones.

9. FPC connector

This connection is reserved for connecting external sub board consisting of more

devices, such as microphone array, buttons and LEDs etc.

10. Earphone jack

Used for plugging in earphones. Audio output is via codec.

11. Speaker output port

Supports two external speakers output via codec.

12. Button

The six buttons ﬁgure different functions, such as RST, BOOT, PLAY, VOL+/-, MUTE etc.

⚠Notice:

The IC design of this chip is a little different from CP2102.

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2. Conﬁguring for AVS

2.1. Software Preparation

1. Installing Flash Download Tool

Linux/macOS/Windows users can use the terminal to ﬂash ﬁrmware. For more details,

please check ESP-IDF Programming Guide.

Windows users may also use a graphical tool to ﬂash ﬁrmware onto the board using the

Flash Download Tool.

2. Downloading Firmware

Please follow the build instructions of the Alexa SDK from the Github page: https://

github.com/espressif/esp-va-sdk.

3. Debugging Tool

Use serial monitor/console that suits your development environment at baud rate of

115200.

4. App for Provisioning

In order to run Alexa you need to provision LyraTD-SYNA with Alexa credentials and

network settings (Wi-Fi SSID and passphrase).

•Android APK: https://play.google.com/store/apps/details?

id=com.espressif.provbleavs

•iOS: https://apps.apple.com/us/app/esp-alexa/id1464127534

2.2. Hardware Preparation

•1 x PC (Linux Operating System is recommended).

•1 x ESP32-LyraTD-SYNA.

•2 x Micro USB cables (one is for the USB power supply).

•1 x Speaker or 1 x earphone.

⚠Notice:

The GitHub repository uses Espressif’s wake-word engine (WWE) for processing the ‘Alexa’ wake-

word. This allows easy evaluations. For production use cases, please reach out to

[email protected] or your Synaptics sales representative to obtain an Amazon certiﬁed wake-word

engine.

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2. Conﬁguring for AVS

2.3. Flashing the Firmware

This document captures the process of ﬂashing the ﬁrmware on Windows. Please refer to

the ESP-VA-SDK repository on Github for setup on other platforms.

2.3.1. Driver Installation

Connect the board to a PC with a Micro-USB cable and install the USB-to-UART driver.

2.3.2. Flashing ESP32

Figure 2-1. Flash Download Tool

•In order to build examples of esp-va-sdk, please follow the instructions mentioned on

the GitHub page.

•Once you build the Alexa ﬁrmware, you will generate three artifacts: bootloader.bin,

partitions.bin and alexa.bin.

•For Flash Download Tool users, follow the instructions given below.

1. Run Flash Download Tool, and click on “ESP32 Download Tool” at the interface.

See Figure 2-1 above.

2. Then you will see the interface shown in Figure 2-2 below.

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2. Conﬁguring for AVS

Figure 2-2. ESP32 Download Tool

3. Select the binary ﬁles (mentioned in table below) and set appropriate address in the

tool as shown in Figure 2-3.

Binary Files

Address

Function

bootloader.bin

0x1000

basic conﬁguration

partitions.bin

0x8000

basic conﬁguration

alexa.bin

0x10000

audio application

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2. Conﬁguring for AVS

Figure 2-3. Flashing Conﬁguration

4. The SPI Download conﬁguration on the ESP32 Download Tool is shown in Figure

2-3. Select “80 MHz” for “SPI SPEED”; select “DIO” for “SPI MODE”; and select

“128 Mbit” for “FLASH SIZE”.

5. Select the COM port in line with the one used by the PC; select “1152000” as a baud

rate.

6. Click the “START” button on the ESP32 Flash Download Tool to start downloading

the ﬁrmware.

7. Wait for the download to ﬁnish. See Figure 2-4.

Figure 2-4. Downloading Firmware

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2. Conﬁguring for AVS

2.4. Network Conﬁguration

2.4.1. Wi-Fi Networking

1. After successfully downloading the ﬁrmware, power on the board again by pressing the

EN button.

2. To conﬁgure the network for the ﬁrst time:

•Turn on the bluetooth in your phone. Open Espressif’s Alexa programming app and

click on Provision New Device. Make sure your phone has internet connectivity.

Figure 2-5. Provision New Device

•The provisioning happens over BLE (Bluetooth Low Energy). Android mandates

applications to have Location permission for accessing BLE. Please provide the

permission when the pop-up shows up.

•You will see the list of available devices that needs to be provisioned, namely ESP-

Alexa-WXYZ. Select the device that you wish to provision.

📖Note:

Terminal users can follow the ﬂashing instructions as available on the GitHub page.

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