Freenove ESP32-S3 User Manual

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63
Chapter 4 Read and Write the SDcard
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The following is the program code:
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#include "sd_read_write.h"
#include "SD_MMC.h"
#define SD_MMC_CMD 38 //Please do not modify it.
#define SD_MMC_CLK 39 //Please do not modify it.
#define SD_MMC_D0 40 //Please do not modify it.
void setup(){
Serial.begin(115200);
SD_MMC.setPins(SD_MMC_CLK, SD_MMC_CMD, SD_MMC_D0);
if (!SD_MMC.begin("/sdcard", true, true, SDMMC_FREQ_DEFAULT, 5)) {
Serial.println("Card Mount Failed");
return;
}
uint8_t cardType = SD_MMC.cardType();
if(cardType == CARD_NONE){
Serial.println("No SD_MMC card attached");
return;
}
Serial.print("SD_MMC Card Type: ");
if(cardType == CARD_MMC){
Serial.println("MMC");
} else if(cardType == CARD_SD){
Serial.println("SDSC");
} else if(cardType == CARD_SDHC){
Serial.println("SDHC");
} else {
Serial.println("UNKNOWN");
}
uint64_t cardSize = SD_MMC.cardSize() / (1024 * 1024);
Serial.printf("SD_MMC Card Size: %lluMB\n", cardSize);
listDir(SD_MMC, "/", 0);
createDir(SD_MMC, "/mydir");
listDir(SD_MMC, "/", 0);
removeDir(SD_MMC, "/mydir");
listDir(SD_MMC, "/", 2);
writeFile(SD_MMC, "/hello.txt", "Hello ");
appendFile(SD_MMC, "/hello.txt", "World!\n");

Freenove ESP32-S3 Specifications

General

Brand	Freenove
Model	ESP32-S3
Category	Control Unit
Language	English