NXP Semiconductors I.MX 8M Manuale utente

NXPSemiconductors

Document Number: IMX8MAVSUG

User's Guide

Rev.

01/2019

User's Guide for NXP i.MX 8M Development

Kit for Amazon AVS

1.Introduction

The NXP i.MX 8M Development Kit for Amazon

Alexa Voice Service (AVS) enables its wide customer

base to easily integrate Alexa into their next generation

design based on i.MX processors. The development kit

consists of a 2-Mic array and the Pico i.MX 8M

development kit, both optimized to deliver a low cost

but flexible design to enable fast development to

production.

To enable customers to deliver a high-quality audio

experience we have partnered with DSP Concepts for

audio algorithms including echo cancellation, beam-

forming, and noise reduction to be delivered in

software. This results in a single chip solution, lowering

overall design cost, while ensuring customers to have

the support and expertise needed to deliver a high-

quality user experience in a short development time.

Contents

1. Introduction........................................................................1

2. What’s in the kit.................................................................2

3. Amazon account setup .......................................................4

4. Hardware setup ..................................................................9

5. Flash the board................................................................. 12

6. Install Alexa SDK ............................................................ 15

7. Running sample AVS App............................................... 26

8. Download MRM packages............................................... 29

9. Testing MRM................................................................... 34

10. Enable auto start of Alexa sample.................................. 44

11. Testing audio................................................................. 46

11.1. Testing audio with DSPC ..................................... 46

11.2. Testing Audio without DSPC (or before executing

setupAVS.sh) ..................................................................... 47

12. References ..................................................................... 48

12.1. Support ................................................................. 48

12.2. Key terms ............................................................. 48

12.3. Speaker references ................................................ 48

12.4. Ordering information and web links ..................... 48

What’s in the kit

User's Guide for NXP i.MX 8M Development Kit for Amazon AVS, User's Guide, Rev. 2, 01/2019

NXP Semiconductors

This user’s guide provides step-by-step instructions for setting up the development kit and accessing and

testing Amazon AVS including account, hardware and software setup. When finished, you will have a

fully functioning prototype with Alexa built-in that uses the TechNexion Voice Hat 2-Mic Development

Kit as an audio front end, and the PICO-PI-IMX8M development board as the processor handling the

Alexa wake word recognition and interface to Amazon AVS.

The NXP i.MX 8M Development Kit for Amazon AVS is available on

https://www.amazon.com/dp/B07HBB1L5Kandhttps://shop.technexion.com/pico-pi-imx8m-

alexa.html.

What’s in the kit

Figure 1. NXP i.MX 8M development kit for Amazon AVS components

NOTE

Antistatic precautions are recommended for assembling the kit.

Amazon account setup

User's Guide for NXP i.MX 8M Development Kit for Amazon AVS, User's Guide, Rev. 2, 01/2019

NXP Semiconductors

Figure 2. NXP i.MX 8M Development Kit with connected TechNexion Hat

In addition to the kit, you will also require:

1. A windows PC with internet connection and a USB port.

2. USB 5 V power adaptor (or use an USB port capable of sourcing power from a PC). Some PC’s may

not provide enough power to the board and will re-boot. If this occurs please use a 5V charger

current instead.

3. Download the serial-to-USB drivers for serial debugging found here.

4. Multi-Room Music (MRM) feature enables music to be played and controlled across multiple,

compatible Alexa devices at the same time. In order to test MRM, you will need a second voice

kit or a MRM-enabled Alexa device.

NOTE ON SPEAKERS

The speakers provided in the kit are for initial prototyping only. For best

Acoustic Echo Cancellation (AEC) and Barge-in performance of the voice

input system, low distortion audio reproduction is important. High quality

speakers are recommended and for space restrained applications, single

transducer configurations perform better than multiple transducers with a

cross-over network.

Go to speaker references section for recommendations.

User's Guide for NXP i.MX 8M Development Kit for Amazon AVS, User's Guide, Rev. 2, 01/2019

NXP Semiconductors

Amazon account setup

To setup a developer account with Amazon, please perform the following steps.

1. Create a free developer account at developer.amazon.com. You can review the AVS Terms and

Agreements here. Create Alexa Voice Service (AVS) project, as shown in Figure 3.

Figure 3. Create Amazon account

2. Follow the steps as explained at https://github.com/alexa/avs-device-sdk/wiki/Create-Security-

Profile#product-information to register your product and create a device and security profile.

After entering in the Security Profile and Security Profile description sections, make sure to

select Other devices and platforms, as shown in Figure 4. Enter in the Client ID section and

select Generate ID.

User's Guide for NXP i.MX 8M Development Kit for Amazon AVS, User's Guide, Rev. 2, 01/2019

NXP Semiconductors

Amazon account setup

Figure 4. Generate client ID

NOTE

When prompted for the Client ID, make sure to use the Client ID from the

Other devices and platforms section.

3. On the Products page, click Manage and you can view your product details, as shown in Figure

Figure 5. Product page

When done, the product profile is as shown in Figure 6 to Figure 9.

User's Guide for NXP i.MX 8M Development Kit for Amazon AVS, User's Guide, Rev. 2, 01/2019

NXP Semiconductors

Amazon account setup

Figure 6. Product Details –Information I

Figure 7. Product Details –Information II

User's Guide for NXP i.MX 8M Development Kit for Amazon AVS, User's Guide, Rev. 2, 01/2019

NXP Semiconductors

Amazon account setup

Figure 8. Product Details –Security Profile I

User's Guide for NXP i.MX 8M Development Kit for Amazon AVS, User's Guide, Rev. 2, 01/2019

NXP Semiconductors

Hardware setup

Figure 9. Product Details –Security Profile II

User's Guide for NXP i.MX 8M Development Kit for Amazon AVS, User's Guide, Rev. 2, 01/2019

NXP Semiconductors

Hardware setup

This section will describe how to connect the Voice Hat board to the PICO-PI-IMX8M board.

1. Remove the jumpers on J11 on the Pico-Pi baseboard, as shown in Figure 10.

Figure 10. J11 on Pico-Pi baseboard

2. Change J2 jumpers to allow the board to boot the preloaded Linux image from eMMC, as shown

in Figure 11.

Figure 11. J2 on Pico-Pi baseboard

3. Verify the pin headers and jumper settings on the back of the audio hat, as shown in Figure 12

and Figure 13.

Hardware setup

User's Guide for NXP i.MX 8M Development Kit for Amazon AVS, User's Guide, Rev. 0, 11/2018

NXP Semiconductors

Figure 12. Back of Voice HAT (header settings)

Figure 13. Back of Voice HAT (switch settings from 1 to 8:10101010)

4. If using Wifi, connect the antennae to the antennae connector located on the top left of the SOM

5. Install the pin extenders on the Pico-Pi base board.

6. Plug the audio hat into the pin extenders on the Pico-Pi board, as shown in Figure 14

Figure 14. Audio hat plugged into the pico-pi board

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