USOUND HELIKE 1.0 UA-E3010 User manual

DEVELOPMENT BOARD
Helike 1.0 UA-E3010 is a development
board for assessing multiple USound
MEMS speaker-based products for rapid
prototyping. The evaluation board is
designed to function in three modes
—standalone, as USB audio device
(UAC 2.0) or as an extension board to
a Raspberry Pi platform with 40 Pin
GPIO interface. Helike 1.0 UA-E3010
also contains a set of ampliers to
drive two MEMS speakers and two
electrodynamic speakers along with
multiple supply options.
HELIKE 1.0 UA-E3010 | USER MANUAL
FEATURES
Standalone mode (SD card playback)
USB Audio Device (UAC 2.0)
Raspberry Pi platform via I2S interface
Multiple supply options, depending on the
availability and application
Compatible with several USound audio
products
2 x MEMS ampliers
2 x electrodynamic speaker ampliers
Digital audio equalizer
Dynamic compression algorithm for MEMS
speakers
SD-Card slot
Joystick for playback control
Helike 1.0 UA-E3010 | User manual
Released in November 2020, updated in June 2022
USound GmbH | www.usound.com | [e-mail]

2
Helike 1.0 UA-E3010 | User manual
Released in November 2020, updated in June 2022
USound GmbH | www.usound.com | [e-mail]
CONTENT
1. OVERVIEW................................................................................................................................................... 5
2. REQUIRED ADDITIONAL PARTS .............................................................................................................. 5
3. BEFORE GETTING STARTED ..................................................................................................................... 5
4. PCB LAYOUT................................................................................................................................................ 6
4.1. TOP LAYER.................................................................................................................................................... 6
4.2. BOTTOM LAYER .......................................................................................................................................... 6
5. SUPPLYING THE HELIKE 1.0 UA-E3010 BOARD.................................................................................... 7
5.1. USB SUPPLY................................................................................................................................................. 8
5.2. EXTERNAL 36 V SUPPLY .......................................................................................................................... 8
5.3. EXTERNAL 5 V ............................................................................................................................................. 9
5.4. 5 V SUPPLY FROM EXPANSION HEADER............................................................................................ 9
6. AUDIO INPUT CONFIGURATION .............................................................................................................. 9
6.1. STANDALONE MODE................................................................................................................................. 9
6.1.1. SD card input ..................................................................................................................................................................9
6.1.2. USB input...................................................................................................................................................................... 10
6.2. SLAVE MODE..............................................................................................................................................10
6.2.1. I2S input ........................................................................................................................................................................ 10
6.3. OVERVIEW..................................................................................................................................................10
7. OUTPUT CONFIGURATION......................................................................................................................11
7.1. CARME SPEAKER BOXES ....................................................................................................................... 12
7.1.1. DIP switch settings.................................................................................................................................................... 12
7.1.2. Speaker attachment .................................................................................................................................................. 13
7.2. FOR DIONE MAXI UY-R3020..................................................................................................................13
7.2.1. DIP switch settings.................................................................................................................................................... 13
7.2.2. Speaker attachment .................................................................................................................................................. 14
7.3. FOR DIONE MINI UY-R3010 ...................................................................................................................14

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Helike 1.0 UA-E3010 | User manual
Released in November 2020, updated in June 2022
USound GmbH | www.usound.com | [email protected]
7.3.1. DIP switch settings.................................................................................................................................................... 14
7.3.2. Speaker attachment .................................................................................................................................................. 14
7.4. FOR DANUBE 5.0 UAM-P2050..............................................................................................................15
7.4.1. DIP switch settings.................................................................................................................................................... 15
7.4.2. Speaker attachment .................................................................................................................................................. 16
8. CREATING A HELIKE 1.0 UA-E3010 CONFIGURATION FILE ..............................................................16
8.1. CUSTOMIZE A HELIKE 1.0 .JSON FILE .................................................................................................16
8.2. FILTER CONFIGURATION........................................................................................................................17
8.3. DRC CONFIGURATION ............................................................................................................................18
8.4. CONVERT .JSON FILE TO .BIN FILE ......................................................................................................19
8.5. PLACE FILE ON MICROSD CARD AND SET DIP SWITCHES .........................................................20
9. INTERFACES...............................................................................................................................................20
9.1. JOYSTICK .....................................................................................................................................................20
9.2. BUTTONS ....................................................................................................................................................21
9.3. LEDS .............................................................................................................................................................21
10. FIRMWARE UPDATE ..............................................................................................................................21
10.1. UPDATE VIA USB-C PORT .....................................................................................................................21
10.2. FIRMWARE UPDATE TROUBLESHOOTING.......................................................................................25
10.2.1. Helike 1.0 UA-E3010 is not detected as DFU device in the DefuSe software ................................. 25
10.2.2. Installing DFU drivers manually......................................................................................................................... 25
10.3. UPDATE VIA SWD INTERFACE.............................................................................................................26
11. TROUBLESHOOTING..............................................................................................................................26
11.1. .WAV AUDIO REPRODUCTION.............................................................................................................26
11.2. ACOUSTIC CANCELLATION ON LEFT CHANNEL IN A TWO-WAY SPEAKER SYSTEM ........27
11.3. EQUALIZATION FILTER IMPLEMENTATION EXAMPLE...................................................................27
11.3.1. Open sample.json file ............................................................................................................................................ 27
11.3.2. Generate coefficients.............................................................................................................................................. 27

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Helike 1.0 UA-E3010 | User manual
Released in November 2020, updated in June 2022
USound GmbH | www.usound.com | [email protected]
11.3.3. Copy coefficients to .json file............................................................................................................................... 27
11.3.4. Convert to .bin and copy to MicroSD card ...................................................................................................... 28
REVISION HISTORY
November 2020: first release.
February 2021:
Updated connector name from J4 to J2, page 8.
Corrected sampling rate information in section 6.1.1, page 9.
Corrected entries in table 4 for I2S slave configuration, page 10.
Added DRC configuration section, page 18.
Added instructions for firmware update via USB-C connector, page 21.
March 2022:
Added Carme Kit to compatible product table, page 5 and page 10.
Add JsonBsonConverter Instruction, page 19.
Add instructions for DFU driver installation and manual DFU driver installation, pages
21-25. Added Troubleshooting section, page 26
June 2022:
Added filter configuration example, page 2
Updated Carme Kit connection section, page 11.

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Helike 1.0 UA-E3010 | User manual
Released in November 2020, updated in June 2022
USound GmbH | www.usound.com | [email protected]
1. OVERVIEW
USound MEMS speakers offer a series of advantages compared to traditional electrodynamic speakers. The
Helike 1.0 UA-E3010 development board enables the evaluation of USound MEMS speakers and the
following USound extension kits:
Table 1: Helike 1.0 UA-E3010 compatible USound products and the corresponding connectors
2. REQUIRED ADDITIONAL PARTS
The Helike 1.0 UA-E3010 development board is delivered with a MicroSD card that can be used to store
filter coefficients and audio files for playback. Note that the MicroSD card is empty when delivered, and the
user must place the desired files (media, configuration files).
Depending on which of the above products will be tested, the corresponding extension kit must be
acquired separately.
3. BEFORE GETTING STARTED
Before getting started, we recommend updating the Helike 1.0 UA-E3010 firmware to the latest available
version. The open-source firmware is available from the public git repository
under https://github.com/usound-audio/Helike 1.0. The compiled firmware files are in the public git
repository under https://github.com/usound-tech/audio_device_configuration in the “release” folder. They
can be used to update Helike 1.0 UA-E3010 via the USB port. Find details in the Firmware update section.
Extension kits
Description
Connector
Dione Maxi UY-R3020
Bendable MEMS speaker array with
external amplifier board
Dione Maxi UY-R3020 connector
Dione Mini UY-R3010
Bendable MEMS speaker array with
integrated amplifiers, extendable
Dione Mini UY-R3010 connector
Carme 3.0 UJ-R1030
Speaker box designed for testing the
performance of MEMS speakers. Can be
fitted with Adap or Achelous speakers.
2.54 mm header from MEMS amp
Danube 5.0 UAM-P2050
Audio module combining a MEMS
tweeter and an electrodynamic woofer
in a 2-way system
2.54 mm header from MEMS and
electrodynamic amp
Carme Kit Ganymede
UJ-E1040G00
Speaker evaluation kit designed for
testing the performance of USound
Ganymede MEMS speakers. Can be
fitted with Adap or Achelous speakers.
2.54 mm header from MEMS amp

6
Helike 1.0 UA-E3010 | User manual
Released in November 2020, updated in June 2022
USound GmbH | www.usound.com | [email protected]
4. PCB LAYOUT
Figure 1 and Figure 2 show the component placement on the PCB.
4.1. TOP LAYER
Figure 1: Component placement on the top layer of the PCB, supply jumpers highlighted
4.2. BOTTOM LAYER
Figure 2: Component placement on the bottom layer of the PCB

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Helike 1.0 UA-E3010 | User manual
Released in November 2020, updated in June 2022
USound GmbH | www.usound.com | [email protected]
5. SUPPLYING THE HELIKE 1.0 UA-E3010 BOARD
The Helike 1.0 UA-E3010 board has four supply options for the microcontroller and its peripherals: USB,
5 V external, 36 V external, and 5 V via Raspberry Pi header. The used supply input depends on the user’s
preference and the used output device. Figure 3 shows the block diagram of the supply lines in the
Helike 1.0 UA-E3010 development board.
Figure 3: Helike 1.0 UA-E3010 supply block diagram
Jumpers JP1, JP2, JP3 and JP4 are used to select the power supply. Note that only one of these jumpers
should be set at a time.
The output device dictates the power consumption of Helike 1.0 UA-E3010. Refer to Table 2 to see which
output device can be used in conjunction with the different power supplies and the limits that apply.

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Helike 1.0 UA-E3010 | User manual
Released in November 2020, updated in June 2022
USound GmbH | www.usound.com | [email protected]
Table 2: Helike 1.0 UA-E3010 supplies and compatible products
1) The copper lines of VCC_36V0 are designed for a current rating of 2 A. One Dione Maxi UY-R3020 sound strip —in
conjunction with an Amalthea 2.0 UA-R3020 amplifier, has a maximum current consumption of 275 mA (20 kHz). Providing
that the power supply can source sufficient current, up to seven Dione Maxi UY-R3020 sound strips can be attached to the
outputs.
2) The copper lines of VCC_5V0_EXTERNAL are designed for a current rating of 10 A. Dione Mini UY-R3010 has a maximum
current consumption of 900 mA (per segment, 20 kHz). Since the power supply can source sufficient current, up to ten
Dione Mini UY-R3010 segments can be attached to the outputs. In a typical use case, the current drawn by one
Dione Mini UY-R3010 segment should not exceed 21 mA.
3) A Carme speaker box (Carme 3.0 UJ-R1030 or Carme Kit Ganymede UJ-E1040G00 speaker box) has a maximum current
consumption of 180 mA (20 kHz). Since the power supply can source sufficient current, up to eight speaker boxes can be
attached to the Helike 1.0 UA-E3010 outputs (four per amplifier).
4) Up to four Danube 5.0 UAM-R2050 audio modules can be connected to Helike 1.0 UA-E3010.
For high current applications (>2 A on VCC_5V0_External and >2.5 A on VCC_36V) replace the respective
coaxial connectors with screw terminals. The respective THT holes are in place underneath the barrel
connectors. TE Connectivity PN 282836-1 are recommended.
5.1. USB SUPPLY
To supply the Helike 1.0 UA-E3010 PCB via the built-in USB-C connector, set a jumper to location JP1.
Ensure that no jumper is set at JP2, JP3, or JP4.
The Helike 1.0 UA-E3010 PCB is configured as USB slave device with a current draw of up to 3 A. When
using the USB supply scheme, ensure that the host device (e.g., a computer, a phone or a power bank) can
supply the required current.
5.2. EXTERNAL 36 V SUPPLY
The Helike 1.0 UA-E3010 PCB can be supplied externally with a voltage of 36 V via the barrel
connector J2. JP2 needs to be set to select this supply. An onboard DCDC converter is used to provide
suitable voltages to the microcontroller and peripherals.
The 36 V external supply is intended for use in conjunction with the Dione Maxi UY-R3020 output device.
The necessary Amalthea 2.0 UA-R3020 amplifier can then be directly supplied with power via the Dione
Maxi UY-R3020 output connector (J16).
Supply/Device
VBUS USB-C
(3 A @5 V)
VCC_36V0 from
barrel connector
VCC_5V0_EXTERNAL
from barrel connector
VCC_5V0_PI
RasPi header
Dione Maxi UY-R3020
No
Yes 1)
No
No
Dione Mini UY-R3010
No
No
Yes 2)
No
Carme 3.0 UJ-R1030
Yes 3)
Yes 3)
Yes 3)
Yes 3)
Carme Kit
Ganymede UJ-E1040G00
Yes 3)
Yes 3)
Yes 3)
Yes 3)
Danube 5.0 UAM-R2050
Yes 4)
Yes 4)
Yes 4)
Yes 4)

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Helike 1.0 UA-E3010 | User manual
Released in November 2020, updated in June 2022
USound GmbH | www.usound.com | [email protected]
5.3. EXTERNAL 5 V
The 5 V external supply is selected by setting jumper JP3. The voltage source needs to be connected to the
P1J barrel connector (J4). Using this supply is mandatory when Dione Mini UY-R3010 is used as an output
device.
5.4. 5 V SUPPLY FROM EXPANSION HEADER
5 V can be supplied from the RaspberryPi expansion header (J17 Pin 2 and 4). This is achieved by setting
jumper JP4. A minimum current of 500 mA is required.
6. AUDIO INPUT CONFIGURATION
The Helike 1.0 UA-E3010 evaluation board has two input configuration options:
In standalone mode, the I2S clocks are generated by the STM32 microcontroller and audio signals can be
input via the USB-C connector (USB soundcard) or by reading audio files from a MicroSD card.
In slave mode, the input comes from a Raspberry Pi or another I2S source and is forwarded by the STM32
microcontroller to the DAC converters.
6.1. STANDALONE MODE
The standalone mode is selected by setting the DIP switch S1 position 8 (S1-8) to OFF. In standalone
mode, the STM32 is the master on all I2S clocks, and the MicroSD card, or the USB input can be selected as
audio sources.
To use the standalone mode the jumpers and solder bridges must be set according to Table 3.
Name
Status
Name
Status
Name
Status
JP5
Removed
JP10
Removed
R5
Irrelevant
JP6
Removed
JP11
Inserted
R6
Irrelevant
JP7
Removed
JP12
Removed
R7
Irrelevant
JP8
Removed
JP13
Removed
R8
Irrelevant
JP9
Removed
R4
Irrelevant
Table 3: Jumper and solder bridge settings for standalone mode
6.1.1. SD CARD INPUT
To select the MicroSD card as the audio source, set the DIP switch S1 position 7 (S1-7) to OFF. MP3 and
WAV files stored in the root directory on the MicroSD card will be played back automatically. The playback
of the files (play, pause, next track) can be controlled with the joystick as described in section 9.1. Note that
the sampling rate of the audio files must be 48 kHz.

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Helike 1.0 UA-E3010 | User manual
Released in November 2020, updated in June 2022
USound GmbH | www.usound.com | [email protected]
6.1.2. USB INPUT
The USB soundcard feature requires the operating system to support UAC 2.0 devices. For Windows, this
applies to Windows 10 build 1703 and later.
To select the USB input as the audio source, set the DIP switch S1 position 7 (S1-7) to ON. When
Helike 1.0 UA-E3010 is connected to a computer via the USB-C connector, it will appear in the operating
system as a stereo soundcard. Select the soundcard and reproduce audio content from the host device.
It is possible to supply Helike 1.0 UA-E3010 via an external supply (VCC_36V0, VCC_5V0, VCC_5V0_PI)
and simultaneously provide the audio data via the USB cable.
6.2. SLAVE MODE
The slave mode is selected by setting the DIP switch S1 position 8 (S1-8) to ON. In slave mode, the STM32
receives I2S audio data and clocks from a source device such as a RaspberryPi.
To use the slave mode the jumpers and solder bridges must be set according to Table 4.
Name
Status
Name
Status
Name
Status
JP5
Removed
JP10
Inserted
R5
Connected
JP6
Removed
JP11
Irrelevant
R6
Connected
JP7
Removed
JP12
Inserted
R7
Connected
JP8
Removed
JP13
Inserted
R8
Connected
JP9
Inserted
R4
Connected
Table 4: Jumper and solder bridge settings for slave mode
6.2.1. I2S INPUT
I2S data can be input to Helike 1.0 UA-E3010 via header J17. The pinout matches the RaspberryPi 40 pin
header and can be seen in the schematics. Helike 1.0 UA-E3010 expects audio data in I2S format with the
following specifications:
•16 bits of resolution
•BTCLK = 1.536 MHz
•FSCLK = 48 kHz, and the falling edge occurs before the first data bit
•Data must be MSB-first and is strobed on the rising edge of the bit clock
6.3. OVERVIEW
Table 5 shows the appropriate settings for DIP switches S1-7 and S1-8 for the three audio input modes.
Input configuration
DIP switch S1-7
DIP switch S1-8
SD card
Off
Off
USB
On
Off
I2S
Off
On
Table 5: DIP S1-7 and S1-8 positions to select audio input mode