SD Card Test Demo

Features

• SD Card Initialization: Mounts an SD card using the SDMMC host driver.
• File I/O: Demonstrates writing to and reading from a file on the SD card.
• Card Information: Retrieves and displays the SD card's name, type, capacity, and other details.
• Error Handling: Includes checks for common errors during SD card operations.

Preparation

• 1 × supported OpenNextion ESP32-S3 smart display
• 1 × USB data cable
• 1 × microSD Card
• 1 × Windows/Mac computer

Before starting, ensure the USB cable supports data transfer and maintain a stable connection between the board and your computer.

Flashing the Firmware

1. Click Flash Online at the top of the page.
2. Select the OpenNextion device model you are using.
3. Choose the corresponding serial port when prompted in the browser.
4. Wait for erasing, writing, and verification to complete. Do not unplug the USB cable during this process.

After successful flashing, the board will automatically restart.

Operating Instructions

1. Prepare the SD Card: Format a microSD card with a FAT32 file system.
2. Connect Hardware: Insert the SD card into the SD card slot on the OpenNextion device.
3. Monitor Output: Open a serial monitor to view the output of the SD card test.