Synaptics AudioSmart User manual

Synaptics AudioSmart® 2-Mic Development Kit for

Amazon AVS

PN:

511-000841-01 Rev C

Synaptics AudioSmart 2-Mic Development Kit for Amazon AVS PN: 511-000841-01 Rev C

Contents

1. Introduction ...................................................................................................................................................... 5

1.1. Target Audience .................................................................................................................................... 5

1.2. References ............................................................................................................................................ 5

1.3. Definitions, Acronyms, and Abbreviations........................................................................................... 5

2. Overview ........................................................................................................................................................... 6

2.1. CX20921 Evaluation Board.................................................................................................................. 7

2.2. Pin Definition......................................................................................................................................... 8

3. Using the Development Kit.............................................................................................................................. 9

3.1. Hardware Setup .................................................................................................................................... 9

3.1.1. Connecting the Evaluation Board to the RPi3 ...................................................................... 9

3.2. Software Setup ................................................................................................................................... 12

3.2.1. Writing Raspbian OS to the MicroSD Card.......................................................................... 12

3.3. Install, Configure, and Build the SDK ................................................................................................ 13

3.4. Running the Setup .............................................................................................................................. 17

3.5. Verifying the Setup.............................................................................................................................. 19

4. Installing the Cypress Siena USB-to-I2C Device Driver ................................................................................. 20

4.1. Flashing New Firmware ...................................................................................................................... 22

5. Troubleshooting.............................................................................................................................................. 24

6. Revision History.............................................................................................................................................. 25

Synaptics AudioSmart 2-Mic Development Kit for Amazon AVS PN: 511-000841-01 Rev C

List of Figures

Figure 1. Development Kit Components .................................................................................................................... 6

Figure 2. CX20921 Evaluation Board: Connections, Interfaces and Devices.......................................................... 7

Figure 3. RPi3 pinout................................................................................................................................................... 8

Figure 4. CX20921 evaluation board setup with RPi3 board and Mic board (with 2-mic attached)...................... 9

Figure 5. Connections for CX20921 evaluation board and Mic board (with 2-mic attached) .............................. 10

Figure 6. Connections for RPi3 .................................................................................................................................11

Figure 7. Example fcp folder .....................................................................................................................................22

Figure 8. Build folder contents .................................................................................................................................22

Synaptics AudioSmart 2-Mic Development Kit for Amazon AVS PN: 511-000841-01 Rev C

List of Tables

Table 1. References .................................................................................................................................................... 5

Table 2. Definitions...................................................................................................................................................... 5

Table 3. CX20921 to RPi3 connections ...................................................................................................................11

Synaptics AudioSmart 2-Mic Development Kit for Amazon AVS PN: 511-000841-01 Rev C

1. Introduction

This document provides step-by-step introductions on setting up the Synaptics AudioSmart®2-Mic

Development Kit for Amazon™ AVS. This document describes how to make the necessary hardware

connections, install the driver, flash the firmware (only when needed), set up the Amazon Alexa™ Voice Service

(AVS), and switch between the keyword detection (voice trigger) modes.

1.1. Target Audience

This document is intended for manufacturers and developers for creating Smart Home device prototypes that

use the Synaptics AudioSmart 2-Mic Development Kit and the Raspberry Pi 3 (RPi3) (not provided with the kit)

to offer an ideal Voice Control experience via Amazon’s Alexa Voice Service.

1.2. References

Table 1. References

Name Description Location

I2C I2C Specification http://www.nxp.com/documents/user_manual/UM10204.pdf

ACPI Advance Configuration and Power Interface http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf

RPi3 An open source code single-board

computer

https://www.raspberrypi.org/products/raspberry-pi-3-model-b/

ALSA The Advanced Linux Sound Architecture

(ALSA) provides audio and MIDI

functionality to the Linux operating system.

http://www.alsa-project.org/main/index.php/Main_Page

ASoC ALSA system on Chip for I2S codecs http://www.alsa-project.org/main/index.php/ASoC

Sensory Wake word engine plug-in for Raspberry Pi https://github.com/Sensory/Alexa-rpi

1.3. Definitions, Acronyms, and Abbreviations

Table 2. Definitions

Term Definition

AVS Alexa Voice Service

DSDT Differentiated System Description Table

GPIO General-Purpose Input/Output

I2C Inter-Integrated Circuit

RPi3 Raspberry Pi 3

Synaptics AudioSmart 2-Mic Development Kit for Amazon AVS PN: 511-000841-01 Rev C

2. Overview

The Synaptics AudioSmart 2-Mic Development Kit for Amazon AVS contains the following:

•CX20921 evaluation board, pre-flashed with firmware for the CX20921 device.

•Microphone module with two omnidirectional mics

•Stereo 3.5 mm male-to-male audio cable

•Micro-USB cable

•Type A to Type B USB cable

•Cable assembly (colored wires)

•+5V power supply for CX20921 evaluation board

Note:

•Micro SD card of at least 8 GB is required

•Powered speakers, RPi3 board, and micro SD card are all mandatory for the set up but are NOT included

in the Synaptics AudioSmart 2-mic Development Kit.

•Proper speaker protection will enhance overall performance. See External Loudspeaker Guidelines

and Recommendations for Smart Speaker Applications (PN: 507-000837-01) document for additional

information.

Figure 1

Development Kit Components

Synaptics AudioSmart 2-Mic Development Kit for Amazon AVS PN: 511-000841-01 Rev C

2.1. CX20921 Evaluation Board

Figure 2

CX20921 Evaluation Board: Connections, Interfaces and Devices

Synaptics AudioSmart 2-Mic Development Kit for Amazon AVS PN: 511-000841-01 Rev C

2.2. Pin Definition

Figure 3 shows the RPi3 pinout definition. Pins 13 and 14 are used and are emphasized in red.

Figure 3

RPi3 pinout

Synaptics AudioSmart 2-Mic Development Kit for Amazon AVS PN: 511-000841-01 Rev C

3. Using the Development Kit

3.1. Hardware Setup

Connect the CX20921 evaluation board and the RPi3 (not provided with the kits).

3.1.1. Connecting the Evaluation Board to the RPi3

Make the following hardware connections between the CX20921 evaluation board and the RPi3 (not provided

with the kit), as shown in Figure 4 and Figure 5.

Figure 4

CX20921 evaluation board setup with RPi3 board and Mic board (with 2-mic attached)

Synaptics AudioSmart 2-Mic Development Kit for Amazon AVS PN: 511-000841-01 Rev C

Figure 5

Connections for CX20921 evaluation board and Mic board (with 2-mic attached)

1. Connect the 3.5 mm audio jack on the RPi3 (J7) to LINEIN on the CX20921 evaluation board (J25).

2. Connect audio jack (J3) (Line Out labeled as HP) on the CX20921 evaluation board to a powered

speaker.

3. Connect the microphone module to the CX20921 evaluation board (J19).

a. Spacing between the left MIC and right MIC should be set to 55 mm with the preloaded

configuration (see Figure 4).

b. Software tool (FCP Essential) will be provided for mic distance adjustment between 30 mm –

120 mm.

4. Connect the audio path from micro USB (J1) to USB port on RPi3.

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