NXP Semiconductors MCU-SMHMI-UG User manual

MCU-SMHMI-UG
Smart HMI User Guide
Rev. 0 — 29 September 2022 User guide
Document information
Information Content
Keywords MCU-SMHMI-UG, SLN-TLHMI-IOT, Human Machine Interface (HMI), Smart
Home, IoT
Abstract This document describes the smart Human Machine Interface (HMI) solution,
and its associated out-of-box features. The SLN-TLHMI-IOT turnkey solution
provides OEMs with a fully integrated, self-contained, software, and hardware
solution.

NXP Semiconductors MCU-SMHMI-UG
Smart HMI User Guide
1 Introduction
The SLN-TLHMI-IOT development kit implements NXP’s EdgeReady turnkey solution
for smart Human Machine Interface (HMI) projects. A high-performance member of the
i.MX RT1170 microcontroller (MCU) family enables this solution. It runs on a Real-Time
Operating System (RTOS) under dual-core architecture. One is Arm Cortex-M7 at 1
GHz clock rates and the other is Cortex-M4 at 400 MHz, with 2 MB on-chip SRAM. The
smart HMI solution provides OEMs with a fully integrated, self-contained, software, and
hardware turnkey solution. It includes cross-platform framework, pre-integrated machine
learning vision, voice algorithm, a 2D graphics accelerator supported by Light and
Versatile Graphics Library (LVGL). The SLN-TLHMI-IOT also includes required drivers for
all necessary peripherals, including memories, cameras, mics, speaker, display, and Wi-
Fi + Bluetooth Low Energy combo chipset. A runtime license to this software solution is
bundled with the i.MX RT117H-numbered devices in the i.MX RT1170 family. The solution
enables developers to implement multi-modal smart interactions with Machine Learning
(ML) vision (face and gesture recognition), far-field voice control, and 2D graphical user
interface on their products. This functionality can be enabled by using only a single
high-performance NXP crossover MCU, simplifying the overall system design. NXP’s
cross-platform dual-core framework architecture empowers designers with the flexibility
to customize their products, making i.MX RT117H a versatile fit for numerous smart
HMI applications. These applications include but are not limited to both consumer and
industrial applications.
Target applications
Smart appliance, smart home, smart building, and smart industrial applications that
require smart, intuitive human machine interactions.
•Smart appliances
–Whitegoods (fridge, standing air conditioner, ovens, laundry, and so on)
–Counter-top (coffee machine, purifier food processor, and so on)
•Smart home
–Alarm and smart home control panels
–Thermostats
–Universal remote controls
–Home entertainment
•Smart building, smart industrial
–Elevator
–Industrial HMI
–Healthcare
–Transportation
–Access and Identification
•Remote conference system, and so on
1.1 Processor overview
The i.MX RT117H is an EdgeReady member of the i.MX RT1170 family of crossover
MCUs, targeting low-cost embedded intellectual HMI applications. It features advanced
implementation of the Arm Cortex-M7 core from NXP. The i.MX RT117H operates at
speed up to 1 GHz and has a power-efficient Cortex-M4 core up to 400 MHz to provide
high-performance and real-time response. The i.MX RT117H has available CPU and
memory resources and many integrated peripherals. These features offer customers
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the maximum flexibility to customize and define products for a multitude of different use
cases.
The i.MX RT117H MCU is licensed to run NXP’s facial biometric authentication library,
audio front-end runtime library, and ML speech engine runtime library, which includes:
•Unified cross-platform framework
•Camera drivers, image capture, and pre-processing
•Face detection, tracking, alignment, and recognition (with quantified results and
confidence measure)
•Voice seeker Audio Front-End (AFE) for Acoustic Echo Cancellation (AEC), Noise
Reduction (NR), beamforming, and barge-in
•Conversa for full duplex speakerphone
•Cyberon or Voice Intelligent Technology (VIT) for automatic speech recognition (wake
words and commands)
•Display drivers, 2D graphics accelerator supported by LVGL
•Built-in security, bootloader, and application validation
•All drivers, including Bluetooth Low Energy and Wi-Fi
•USB mass storage device updates
•Support secure firmware update over a wireless connection
•Factory automation scripts
•Supported by an MCUXpresso SDK, MCUXpresso IDE, and configuration tools
1.2 Voice library limitations
Voice seeker AFE and Cyberon ASR libraries are provided with our SLN-TLHMI-IOT
projects as evaluation versions.
Note: Voice seeker AFE stops working after 25 hours, while Cyberon ASR stops working
after 100 detections.
To have voice detection work again, a power cycle is required when either one of these
thresholds is met.
Production versions of the libraries can be shared upon request.
2 Recommended configuration
Modifying and debugging the SLN-TLHMI-IOT example projects requires an up-to-date
computer that can run MCUXpresso IDE version 11.5.0.
Note: Both the 11.5.1 and 11.6.0 versions have bugs preventing the SLN-TLHMI-IOT
development experience from working as intended.
Computer type OS version Terminal program
Apple MAC OS PuTTY
PC Windows 7/10/11 PuTTY/Tera Term
PC Linux PuTTY
Table 1. Recommended computer configuration
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3 Hardware
The SLN-TLHMI-IOT turnkey solution for combined face and voice recognition comes
with a cost and form-factor-optimized hardware reference designs and access to full
software source code. In addition to the i.MXRT117H MCU, the board employs different
sensors and peripherals to provide tools to help develop applications with a wide array
of functions. Many of the onboard sensors and peripherals can be seen in Figure 1 and
Figure 2.
Figure 1. SLN-TLHMI-IOT kit callout
Figure 2. SLN-TLHMI-IOT main board callout
CAUTION: Depending on the mode of operation, the SLN-TLHMI-IOT kit can emit highly
concentrated white or non-visible infrared light which can be hazardous to human eyes.
Products which incorporate these devices must follow the safety precautions given in IEC
60825-1 and IEC 62471.
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For more information about the hardware design of the SLN-TLHMI-IOT, see the Smart
HMI Hardware Development User Guide.
3.1 Screen
The SLN-TLHMI-IOT kit, by default, uses a 5.5 inch TFT display (Rocktech
RK055MHD091A0-CTG) with 720*1280 resolution, LED backlight, full viewing angle,
MIPI interface, and a capacitive touch panel.
Datasheet: Rocktech RK055MHD091A0-CTG
Purchase link: Rocktech RK055MHD091A0-CTG
3.2 Speaker
A PUI ASE02808MR-150-R enclosed 8 Ω 2 W speaker is embedded in the SLN-TLHMI-
IOT kit.
Datasheet: ASE02808MR-LW150-R
Purchase link: ASE02808MR-LW150-R
3.3 Cameras
The SLN-TLHMI-IOT kit uses a GC2145 camera sensor by default. The GC2145 is a
high-quality 2MP CMOS image sensor. It incorporates a 1616 V x 1232 H active pixel
array, on-chip 10-bit ADC, and an image signal processor. The camera sensor connects
to the kit via a Mobile Industry Processor Interface (MIPI) interface. Additionally, the SDK
associated with the SLN-TLHMI-IOT has software support for both the device driver and
Hardware Abstraction Layer (HAL) driver for the sensor.
The stock firmware utilizes the camera sensor to register face data and recognize faces.
In addition to the GC2145 camera sensor, alternative image sensors are available for
use, including the GC0308 sensor. The default firmware does not support the GC0308
sensor. Enabling this camera requires minor code modifications to enable the respective
HAL device driver in the firmware. The GC0308 sensor connects to the kit using a CSI-
DVP interface.
3.4 Wireless radios
Usage condition
The following information is provided per Article 10.8 of the Radio Equipment Directive
2014/53/EU:
(a) Frequency bands in which the equipment operates
(b) The maximum RF power transmitted
PN RF technology (a) Frequency range (b) Maximum
transmitted power
SLN-TLHMI-IOT Bluetooth 2402-2483 MHz 4 dBm
Table 2. Bluetooth/WLAN frequency and power
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PN RF technology (a) Frequency range (b) Maximum
transmitted power
WLAN 2.4 GHz ISM Bands 2.412-2.472
GHz
5.15-5.25 GHz (FCC UNII-low
band) for US/Canada and Europe
5.25-5.35 GHz (FCC UNII-middle
band) for US/Canada and Europe
5.47-5.725 GHz for Europe
5.725-5.825 GHz (FCC UNII-high
band) for US/Canada
18.5 dBm
Table 2. Bluetooth/WLAN frequency and power...continued
EUROPEAN DECLARATION OF CONFORMITY (Simplified DoC per Article 10.9 of
the Radio Equipment Directive 2014/53/EU)
This apparatus, namely SLN-TLHMI-IOT, conforms to the Radio Equipment Directive
2014/53/EU. The full EU Declaration of Conformity for this apparatus can be found at:
www.nxp.com/mcu-smhmi.
4 Bootloader
The SLN-TLHMI-IOT uses a multi-stage boot process to enhance the capabilities of the
out-of-box firmware (FW) to include additional functionality. Such as the ability to flash
new firmware images remotely and without a debugging probe.
The bootloader operates as the first stage of the boot process, determining which
available out-of-box demo applications (coffee machine and elevator) to use, if any.
The bootloader, in addition to choosing which of the default out-of-box applications to
use (Normal Boot mode), also supports an additional boot mode: Mass Storage Device
(MSD) update mode. The following sections describe each of these different boot modes
in more detail.
4.1 Boot modes
The bootloader supports several different boot-up methods which augment the boot-up
behavior. These methods include Normal Boot mode (default) and Mass Storage Device
(MSD) mode for drag-and-drop flashing of new firmware images. The following sections
describe the usage of each different boot mode and how to enable them.
A high-level overview of the purpose of each of these features is discussed below.
Information regarding their usage, creating update payloads, and more can be found in
the Smart HMI Software Development User Guide.
4.1.1 Normal boot
By default, if no boot flags are set during the boot phase, the Normal Boot mode is used.
During Normal Boot, the bootloader simply boots into the "main" out-of-box demo
application that is most recently used. For example, if the coffee machine application is
used most recently, the bootloader jumps to the flash address associated with the coffee
machine application. Similarly, if either the elevator or smart home panel application
is used most recently, the bootloader jumps to the flash address associated with the
elevator or smart home panel application. If powering the kit for the first time and no
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previous application has been selected, the bootloader requires an application to be
manually selected first.
The OoBE FW has a set of three different applications that can be booted into at startup.
To select an application for the bootloader to use, while the kit is being powering on,
press and hold one of the onboard push buttons on the back of the kit. The switch
corresponding to each application is shown below:
•SW1 – Coffee Machine
•SW2 – Elevator
4.1.2 Mass Storage Device (MSD)
The MSD feature allows the SLN-TLHMI-IOT to receive firmware updates without a
debugging probe like a SEGGER J-Link. Instead MSD uses USB to emulate an MSD
interface like the one that is used for USB flash drives.1 This feature can be especially
useful for marketers or engineers in the field without access to a dedicated debug probe
tool.
MSD mode is enabled by pressing and holding the SW0 pushbutton on the back of the kit
while the kit is powering on.
Once enabled, a blinking purple LED on the front of the kit which pulsates at an interval
of roughly 1 second indicates MSD mode.
1Currently only supported on Windows PC devices running Windows 7 or newer
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Figure 3. Purple LED indicating MSD mode
Additionally, the PC recognizes the USB interface, assuming your SLN-TLHMI-IOT is
connected to a Windows PC. It shows a new USB Drive corresponding to your SLN-
TLHMI-IOT kit.
Figure 4. New USB drive for SLN-TLHMI-IOT kit
To update the firmware image on your kit, drag and drop the new binary to the USB drive
corresponding to your kit. Assuming the binary is properly generated, the bootloader
automatically updates the firmware on your device. Flashing a new firmware image
results in a pop-up window identical to the one used when copying files to a real USB
flash drive device.
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Figure 5. Copying new binary to the USB drive
Note: Only the main application (for example, coffee machine or elevator) can be
updated using MSD. The bootloader cannot be updated using MSD and requires the use
of a SEGGER J-Link Debug Probe or the Factory Programming Flow. Instructions MSD,
J-Link-based updates, and the Factory Programming Flow can be found in the Smart
HMI Software Development User Guide.
For more information regarding MSD mode and its usage, as well as instructions on
generating FW binaries compatible with MSD mode, see the Smart HMI Software
Development User Guide.
5 Out-of-box demo applications
5.1 Overview
There are two distinct applications that come pre-flashed with your kit: Coffee Machine
and Elevator. These example applications are built to showcase the complex machine
vision, machine voice, and advanced graphical UI capabilities the kit supports. They also
provide a base software platform for rapid integration of unique customer applications
and requirements.
The Coffee Machine application presents an example of a potential smart HMI use
case. Here, an HMI device must operate using hands-free voice control capabilities while
providing custom user experiences using face recognition to recognize repeat users of
the machine.
The Elevator application presents similar capabilities to the coffee machine demo by
providing an example of a smart HMI device. This device operates using hands-free
voice control capabilities to interact with an elevator, selecting the floor number, opening
and closing the elevator doors, and so on. Additionally, the elevator demo application
automatically recognizes new users and asks to save the floor number they traveled to.
When powering on your kit, a brief startup screen appears which shows icons for each
available out-of-box demo application. The icon associated with the currently enabled
application is most prominently displayed using a slightly larger icon.
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Figure 6. Startup screen
Each of the out-of-box demo applications is described in more depth in the following
sections.
5.2 Coffee machine
5.2.1 Overview
The coffee machine application, preprogrammed in the SLN-TLHMI-IOT kit, presents
a demo application. This application integrates both face and multi-language speech
recognition while showcasing the advanced graphics capabilities of the RT117H’s 2D
GPU as well.
In the demo, users can select their coffee preferences using onscreen touch controls
and hands-free voice control. After selecting their preferred coffee, they can save their
order by anonymously associating it with their face. The next time that face is recognized,
they can either choose a new coffee selection or automatically use their saved coffee
selection.
The following sections describe the out-of-box features of the coffee machine demo and
their usage.
5.2.2 Standby screen
After exiting the startup screen, a standby screen is displayed, which acts as a screen
saver to indicate that the system is waiting for user interaction. The standby screen
is shown in a few different scenarios, including: after startup, after coffee has finished
brewing, and after a ~60 second timeout with no user interaction (voice commands/touch
controls) has been reached.
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Figure 7. Standby screen
The standby screen also allows you to select your preferred language settings using the
drop-down language selector menu found in the top-right corner of the screen or by using
the wake word associated with your preferred language.
To exit the standby screen, simply touch the touchscreen or use the wake word
supported by your preferred language, as described in Section 5.2.6.
5.2.3 Home screen
You can access the home screen by speaking the wake word "Hey NXP" or touching the
screen while the application is in Standby mode.
The home screen is split into two distinct sections: a camera preview pane on the left
side of the screen, and a coffee selection section on the right side of the screen.
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Figure 8. Home screen
By default, the dedicated camera preview shows output from the RGB camera2. A
bounding box in the center of the camera preview window is intended to help users
properly align their faces with the camera. The box indicates the status of the face
recognition pipeline ("Face Not Detected", "Face Detected", and "Face Recognized")
based on the color of the box.
Figure 9. Face not detected
2For an alternative to the camera preview pane, see the Section 5.2.7.
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Figure 10. Face detected
Figure 11. Face recognized
On the right half of the screen are the three different selections for modifying the coffee
selection: the coffee type, size, and strength.
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Figure 12. Coffee selection
In addition to the camera preview and coffee selection menu, there is also a Start button
in the bottom-left portion of the screen. The screen also has a language selector drop-
down menu in the top-right corner.
The Start button enables the brewing screen which "brews" a coffee based on the user’s
selected coffee preferences.
The language drop-down menu is used to configure the UI language settings as well as
the language used for the hands-free voice commands. See Section 5.2.6 for more info
regarding supported languages, wake words, and commands.
5.2.3.1 Bounding box colors
As previously mentioned, the coffee machine home screen has a camera preview
window with a bounding box for helping users align their faces properly for detection.
By default, this bounding box is blue. The blue color indicates the default face recognition
state, which means that no face is recognized yet.
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Figure 13. No face detected
The bounding box turns red when a face is detected but is not recognized. This state
indicates that the following coffee selection can be associated with the face detected.
Figure 14. Face is detected but not registered
The bounding box turns green when a face is detected and a coffee selection is
associated with it. Additionally, a red X for removing the recognized face is displayed in
the top-left corner of the screen. For information about how to save your coffee selection,
see Section 5.2.3.6.
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Figure 15. Face is detected and a coffee is associated with it
5.2.3.2 Selecting coffee type
The coffee machine application allows configuring several different coffee preference
settings, including the type of coffee. The coffee machine application has four default
coffee types: Americano, Cappuccino, Espresso, and Café Latte. Each coffee type can
be selected using touch controls or hands-free voice commands.
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Figure 16. Available coffee types
When using voice commands, a confirmation tone plays, saying "Americano",
"Cappuccino", "Espresso", or "Café Latte", and a green LED indicates that the command
is successfully recognized.
When the onscreen coffee type touch controls are used or a "Coffee Type" voice
command is recognized, the icon indicating the currently selected coffee type updates to
reflect the new selection.
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Figure 17. Selecting coffee type
5.2.3.3 Selecting coffee size
The coffee machine application allows configuring several different coffee preference
settings, including the size of the coffee. The onscreen Size selector can be used to
adjust the size of the coffee to "Small", "Medium", or "Large" by using the touchscreen
controls.
Figure 18. Selecting coffee size
In addition to the touchscreen controls, the coffee size can be adjusted using the
"Small", "Medium", and "Large" voice commands, depending on the desired coffee size3.
3These commands apply only when the language setting is set to “English.” For commands supported in
other languages, see the Voice Commands section.
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Upon successfully recognizing a voice command, the slider position updates, and a
confirmation tone with a green LED pulse indicate the success of the voice command.
The chosen size affects how long the animation on the brewing screen takes. For
example, small takes the shortest amount of time while large takes the longest.
5.2.3.4 Selecting coffee strength
The coffee machine application allows configuring several different coffee preference
settings, including the strength of the coffee. The onscreen Strength slider can also be
used to adjust the strength of the coffee by using the touchscreen controls.
In addition to the touchscreen controls, the coffee strength can be adjusted using
"Soft", "Mild", or "Strong" voice commands depending on the desired coffee strength4.
Upon successfully recognizing a voice command, the slider position updates, and a
confirmation tone with a green LED pulse indicates the success of the voice command.
Figure 19. Selecting coffee strength
5.2.3.5 Brewing coffee
After setting coffee preferences, users may begin brewing the coffee by pressing
the onscreen Start button or using the equivalent "Start" command in the configured
language. The Start button remains greyed out and unusable until a coffee type, size,
and strength have been selected.
4These commands apply only when the language setting is set to “English.” For commands supported in
other languages, see the Voice Commands section.
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Figure 20. Start button
During the brewing process, the display transitions to the brewing screen, which
represents a coffee being brewed and dispensed. While coffee is brewing, the selected
type, size, and strength of the coffee being brewed are shown onscreen.
5.2.3.6 Saving coffee selection
Users can associate their preferred coffee and language settings with their face for the
TLHMI kit to reuse their coffee preferences when the camera next recognizes them.
To save a new user, configure the preferred coffee and language settings using the
controls described in the previous sections. After configuring the settings, begin brewing
coffee, by pressing the Start button or using the "Start" voice command.
When the coffee brewing animation is complete, the screen briefly transitions to the final
screen before re-enabling the standby screen.
While the final screen is being shown, an audio prompt plays, "Save your coffee
selection? Confirm or Cancel" for either of the following events:
•The application detects an unrecognized face
•A face is recognized, but a coffee different from the saved preferences is chosen
Replying "Confirm" (or the equivalent in the configured language) saves the current
coffee selection to the user’s face and transitions the kit back to Standby mode.
Replying "Cancel" (or the equivalent in the configured language) aborts saving the
current coffee selection and transitions the kit back to Standby mode.
5.2.3.7 Automatic coffee selection
When the application boots and/or transitions out of Standby mode and recognizes a
face, an audio prompt asks users if they would like to reuse their saved coffee selection.
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