usb_audio_class_example

Source Path: example\cherryusb\device\emmc_disk

Supported Platforms

sf32lb52-lcd_n16r8

Overview

This example demonstrates using CherryUSB MSC with eMMC (via the SDIO interface) to implement a virtual USB flash drive (U disk). It includes:

The PC can view a USB drive named “SiFli MSC DEMO” in the file manager.

How to Use This Example

Hardware Requirements

Before running this example, you need to prepare:

A development board supported by this example (Supported Platforms).
A USB-A to Type-C data cable with data transfer capability.
A host device that supports USB.

menuconfig Configuration

Enable SDIO:
- Path: On-chip Peripheral RTOS Drivers → Enable SPI BUS
- Enable: Enable SDIO
  - Macro: BSP_USING_SDIO
  - Purpose: Enable the SDIO driver.
Enable and configure SD device:
- Path: RTOS → RT-Thread Components → Device Drivers
- Enable: Using SD/MMC device drivers
  - Macro: RT_USING_SDIO
  - Purpose: Use SDIO as the underlying interface, so SDIO must be enabled.

Compilation and Flashing

Switch to the project directory and run the scons command to compile:

scons –board=sf32lb52-lcd_n16r8 -j32

Switch to the project/build_xx directory and run uart_download.bat. Follow the prompts to select the port for downloading:

./uart_download.bat

Uart Download

please input the serial port num:5

For detailed steps on compilation and downloading, please refer to the Quick Start Guide.

Expected Results

After the example starts: The host connects to the board via the data cable. The PC can see a USB drive named “SiFli MSC DEMO” in the file manager. In Windows Device Manager, a new device appears under Universal Serial Bus controllers: USB Mass Storage Device.

Troubleshooting

Reference Documents

Revision History

Version	Date	Release Notes
0.0.1	09/2025	Initial version