Freenove ESP32-S3 User Manual

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Chapter 4 Read and Write the SDcard
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} else {
Serial.println("UNKNOWN");
}
Call the listDir() function to read the folder and file names in the SD card, and print them out through the
serial port. This function can be found in "sd_read_write.cpp".
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listDir(SD_MMC, "/", 0);
Call createDir() to create a folder, and call removeDir() to delete a folder.
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createDir(SD_MMC, "/mydir");
removeDir(SD_MMC, "/mydir");
Call writeFile() to write any content to the txt file. If there is no such file, create this file first.
Call appendFile() to append any content to txt.
Call readFile() to read the content in txt and print it via the serial port.
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writeFile(SD_MMC, "/hello.txt", "Hello ");
appendFile(SD_MMC, "/hello.txt", "World!\n");
readFile(SD_MMC, "/hello.txt");
Call deleteFile() to delete a specified file.
Call renameFile() to copy a file and rename it.
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deleteFile(SD_MMC, "/foo.txt");
renameFile(SD_MMC, "/hello.txt", "/foo.txt");
Call the testFileIO() function to test the time it takes to read 512 bytes and the time it takes to write 2048*512
bytes of data.
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testFileIO(SD_MMC, "/test.txt");
Print the total size and used size of the SD card via the serial port.
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Serial.printf("Total space: %lluMB\r\n", SD_MMC.totalBytes() / (1024 * 1024));
Serial.printf("Used space: %lluMB\r\n", SD_MMC.usedBytes() / (1024 * 1024));

Freenove ESP32-S3 Specifications

General

Brand	Freenove
Model	ESP32-S3
Category	Control Unit
Language	English