N9H30 must have I2S codec in hardware design for audio playback,
The emWin don't support the mp3 decoder.

if you need the chip information.

you can refer the page
https://www.nuvoton.com/hq/products/iot ... _locale=en

NK-N9H20

NuMaker emWin N9H20 Features


CPU :200 MHz ARM926EJ-S N9H20K51N
Memory : 32MB DDR memory

USB 2.0 High speed device
USB 2.0 Full speed host
3.5” (320x240) 24-bit RGB LCD
UART x 1
Where to buy
https://direct.nuvoton.com/en/numaker-emwin-n9h20

RDK-N9H30 CPU : N9H30K51IEC 300MHz ARM926 Core LCD : 7" 800x480 , 24bit Color , resistive touch Memory 32MB DDR Memory 1Gbit NAND Flash 128Mbit SPI NOR Flah SD Card Feature 1 port 10/100 Ethernet 2 port UART (Tx/Rx) 1 port RS485 1 port CAN Bus 1 port USB 2.0 High Speed Host 1 port USB 2.0 High Spee...

RDK-N9H20 CPU : N9H20K51N 200MHz ARM926 Core LCD : 4.3" 480x272 , 24bit Color , resistive touch Memory 32MB DDR Memory 1Gbit NAND Flash Feature 1 port UART (Tx/Rx) Power 5V /2A RDK-N9H20(F) (複製).png RDK-N9H20(B) (複製).png Where to download resources https://www.nuvoton.com/hq/products/application-sp...

Can you provide the reference code ?

If you need the Tomato board .
you can buy it from Nuvoton's Driect store.
https://direct.nuvoton.com/en/numaker/

Nuvoton NuMaker Tomato is a single board computer (SBC) with simple layout. It adopts the developer-friendly open source environment, and runs on the Linux operating system. It is embedded with the 32-bit ARM926EJ-S NUC976DK62Y processor core which runs up to 300 MHz. The Tomato includes the NAU8822...