Synaptics AudioSmart User manual

Synaptics AudioSmart 4-Mic Development Kit

for Amazon AVS

511-000838-01 Rev A

Downloaded from Arrow.com.

Synaptics AudioSmart 4-Mic Development Kit for Amazon AVS 511-000838-01 Rev A

Synaptics Confidential. Internal Use Only.

Synaptics Confidential. Disclosed Only Under NDA - Limited Distribution.

S ti C fid ti l Di l d O l U d NDA

Revision History

Document No. Release Date Change Description

511-000838-01 Rev A 11/07/17 Conversion to Synaptics template

005UGR01 09/19/17 Updated:

Step 2 in “Writing Raspian OS to microSD Card” on page 6.

005UGR00 05/03/17 Initial release

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CX20924 User Guide Table of Contents

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Table of Contents

Revision History ...........................................................................................................................................................2

Scope.............................................................................................................................................................................1

Target Audience ............................................................................................................................................................1

References ....................................................................................................................................................................1

Definitions, Acronyms, and Abbreviations.................................................................................................................1

Overview........................................................................................................................................................................2

CX20924 EVK ................................................................................................................................................................3

Microphone/LED Module..............................................................................................................................................4

Step-by-Step Setup Summary .....................................................................................................................................5

Writing Raspbian OS to the microSD Card ................................................................................................................6

Connecting the EVK and Microphone/LED Module to the RPi 2..............................................................................7

AVS Setup....................................................................................................................................................................10

Building and Installing the Linux Kernel ..................................................................................................................14

Running LED Server, Node.js Service, Sample App, Wake Word Engine, and Recording Agent.......................18

Terminal Window 1 ............................................................................................................................................................ 19

Terminal Window 2 ............................................................................................................................................................ 19

Terminal Window 3 ............................................................................................................................................................ 19

Terminal Window 4 ............................................................................................................................................................ 19

Terminal Window 5 ............................................................................................................................................................ 20

AVS Setup: Amazon Account Login ................................................................................................................................ 20

Verifying the Setup .....................................................................................................................................................23

Installing the Cypress Siena USB-to-I2C Device Driver..........................................................................................24

Flashing New Firmware..............................................................................................................................................26

Trademarks..................................................................................................................................................................28

Notice...........................................................................................................................................................................28

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CX20924 User Guide List of Figures

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List of Figures

Figure 1: Development Kit Components...........................................................................................................................................2

Figure 2: CX20924 EVK: Connections, Interfaces, and Devices......................................................................................................3

Figure 3: Microphone/LED Module: Four Digital Microphone Locations........................................................................................... 4

Figure 4: Connecting Cable Assembly to RPi GPIO Pins.................................................................................................................7

Figure 5: Connecting Output of 4-Mic Processed Signal.................................................................................................................. 8

Figure 6: Connecting Powered Speakers to the LINEOUT Port....................................................................................................... 8

Figure 7: Connecting 5V Power Supply to J1 Connector on the EVK .............................................................................................. 9

Figure 8: DS20924 Mounted on Speaker ......................................................................................................................................... 9

Figure 9: Alexa Voice Service User Interface ................................................................................................................................. 20

Figure 10: Example FCP Folder ..................................................................................................................................................... 26

Figure 11: Build Folder Contents .................................................................................................................................................... 27

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User Guide Scope

Synaptics Confidential

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Scope

This documentation provides step-by-step instructions on setting up the Synaptics AudioSmart™ 4-Mic

Development Kit for Amazon AVS. The document covers how to make the necessary hardware

connections, install the driver, flash the firmware (only when needed), configure the Raspberry Pi2 (RPi 2),

and set up the Amazon Alexa Voice Service (AVS).

Note: Only use the RPi 2 with this configuration. Do not use the Raspberry Pi 3 (RPi 3).

Target Audience

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

that utilize the Synaptics AudioSmart 4-Mic Development Kit and the RPi 2 (not provided with the kit)

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

References

Definitions, Acronyms, and Abbreviations

Subject Description Location

I2CI

2C Specification http://www.nxp.com/documents/user_manual/UM10204.pdf

ACPI Advanced Configuration and

Power Interface

http://www.acpi.info/DOWNLOADS/ACPIspec50.pdf

RPi 2 An open source code single-

board computer

https://www.raspberrypi.org/products/raspberry-pi-2-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

RPi 2 Kernel building https://www.raspberrypi.org/documentation/linux/kernel/

building.md

Name of Document Description

AVS Alexa Voice Service

DSDT Differentiated System Description Table

GPIO General-Purpose Input/Output

I2CInter-Integrated Circuit

RPi 2 Raspberry Pi 2

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User Guide Overview

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Overview

The Synaptics AudioSmart 4-Mic Development Kit for Amazon AVS contains the following:

•CX20924 EVK

•Microphone/LED module (positioned on top of the CX20924 when shipped)

•USB cable

•Cable assembly (colored wires)

•+5V power supply

Note:

•Micro SD card of at least 16GB is required.

•Powered speakers, RPi 2, and micro SD card are all mandatory for the set up but are NOT

included in the Synaptics AudioSmart 4-Mic Development Kit for Amazon AVS.

Proper speaker selection will enhance overall performance. Download External Loudspeaker Guidelines

and Recommendation for Smart Speaker Applications (008DGR0x) document for additional info.

Figure 1: Development Kit Components

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User Guide CX20924 EVK

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CX20924 EVK

Figure 2: CX20924 EVK: Connections, Interfaces, and Devices

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User Guide Microphone/LED Module

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Microphone/LED Module

Figure 3: Microphone/LED Module: Four Digital Microphone Locations

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User Guide Step-by-Step Setup Summary

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Step-by-Step Setup Summary

1. Write a Raspbian Image to the micro SD. Load the current Raspbian OS using Linux kernel version

4.4. See "Writing Raspbian OS to the microSD Card" on page 6.

2. Connections between the CX20924 EVK and the Microphone / LED module are already established.

To set up the hardware connection between these two boards and the RPi 2 (not provided with the kit)

refer to "Connecting the EVK and Microphone/LED Module to the RPi 2" on page 7.

3. Set up the AVS. See "AVS Setup" on page 10.

4. Build and install the Linux kernel. See "Building and Installing the Linux Kernel" on page 14.

5. Once the hardware and software setup is complete, refer to the following to run the 4-mic setup:

"Running LED Server, Node.js Service, Sample App, Wake Word Engine, and Recording Agent" on

page 18.

6. Refer to the following to connect to an Amazon account: "AVS Setup: Amazon Account Login" on page

20.

7. Verify the setup. See "Verifying the Setup" on page 23.

8. Conduct Cypress Siena USB-to-I2C device driver installation if required. This step is optional. See:

"Installing the Cypress Siena USB-to-I2C Device Driver" on page 24.

9. Flashing New Firmware. This step is optional. Upgrade the firmware for the CX20924 device. Note that

the CX20924 evaluation board is pre-flashed with the firmware required so this step is only necessary

if an updated CX20924 firmware is provided. See "Flashing New Firmware" on page 26.

User Guide Writing Raspbian OS to the microSD Card

Synaptics Confidential

11/07/17 511-000838-01 6

Writing Raspbian OS to the microSD Card

1. Format the SD card. This can be done by going to the 'Computer' folder and right clicking on the SD

card. Click Format… to display the format options. When reformatting, confirm that the File system is

FAT32 or FAT, as shown below.

2. Download the Raspbian Jessie OS. The zip file is located at the following link:

http://downloads.raspberrypi.org/raspbian/images/raspbian-2017-07-05/

3. Unzip and write the downloaded image to the SD card using Win32DiskImager. This tool can be found

at the following link: https://sourceforge.net/projects/win32diskimager/

4. Run the Win32DiskImager to write the image to the SD card.

–Browse to the subdirectory icon and select the image file.

–Select the device drive in the Device drop down menu to write the Raspbian OS.

–Click Write to write the image to the SD card.

5. After the image has finished writing, insert the microSD card into the RPi 2.

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