1. Hardware

- The ESK32-A9A21 expansion board x 1
- HT32 series development board x 1
- Micro USB cable x 1
- Computer x 1
- Speaker x 1

Please refer to below development boards which can use alongside the ESK32-A9A21.

2. Software

- HT32 Voice Tool
- Keil^TM MDK-ARM μVision5 (open source: Cortex-M0+ version)
- Keil^TM MDK-ARM μVision5 Installation Guide

STEP 1.

Align the socket on the back of ESK32-A9A21 with the pin header of HT32 series development board and insert it.
If the expansion board does not work, please check that whether the socket has a poor contact or insert the pin header deeper.

STEP 2.

It is important that PWM output on the expansion board needs to correspond with development board.
For example: when using the ESK32-30501 (development board of MCU HT32F52352), the Jumper needs to be connected to PWM_1A and PWM_1B.

STEP 3.

Connect speaker to speaker output of the expansion board.

STEP 4.

Connect the USB to the e-Link32 Lite interface of the expansion board.

STEP 5.

Open the HT32 Voice Tool software and import WAV file (only monophonic WAV file can be import to the software), and program the music to the development board. Please refer to Audacity for format conversion.

STEP 6.

Press the reset button on the development board to reset program. Users can demonstrate voice effect via the expansion board after then.

1. Holtek HT32 Series Expansion Board: ESK32-A9A21, including user manual.
2. BBC Sound Effects: provide open source of WAV files. Only for personal, education and research uses.
3. Audacity: open source software for music recording and editing. It can be used to convert music format and edit pitch, sound speed, etc.