Bluetooth voice speaker

Project Overview:
This project uses the STC8H8K64U-45I-LQFP32 as the main controller for serial communication with the KT1025A, and can be operated via button control and voice control.
Bluetooth Chip Description:
The KT1025A chip is a single-chip solution supporting Bluetooth audio and data, as well as playback from USB flash drives and TF cards. Its highlights include support for lossless music playback, simple and clear serial port control functions, and support for BLE and SPP pass-through functions. This significantly reduces the development difficulty of embedding Bluetooth in other products. Priced around 3 yuan, it's very popular. The BT201 is a test demo of the KT1025A and KT1025B chips. Function descriptions: 1. 16-bit Stereo DAC with headphone amplifier, SNR >= 95dB; 2. No crystal oscillator or load capacitor required, the chip automatically generates the Bluetooth MAC address, no need for rolling programming; 3. Supports full decoding of MP3, WAV, WMA, FLAC, AAC, and APE formats; 4. Supports up to 128GB USB flash drives and TF cards; 5. Supports breakpoint memory and track memory functions; 6. Supports Bluetooth audio transmission to connect to a mobile phone for music transfer, supports play/pause, and skip tracks; 7. Supports Bluetooth calling function, which can be canceled by the user, supporting answering, hanging up, calling back, and rejecting calls; 8. Bluetooth 5.0 version, supports HFP/A2DP/AVRCP/HSP/GAVDP/IOP/SPP/BLE, with a range of approximately 10 meters; 9. Class 2 4dBM. The frequency range is 2.4G-2.480G5, supports BLE transparent transmission function, and can be connected separately to "BT201-BLE" to support SPP transparent transmission function.
Physical diagram,

schematic diagram and design description:
This project uses STC8H8K64U-45I-LQFP32 as the main controller to communicate with KT1025A via serial port, and can be operated by button control and voice control.