Try this code if you have expansion board with SD installed
#include "FS.h"
#include "SD.h"
#include "SPI.h"
#include <time.h>
#include <WiFi.h>
//#define SD_chipSelect D2 //XIAO
#define SD_chipSelect 21 //XIAO ESP32S3 Cam Board
const char* ssid = "your-ssid";
const char* password = "your-password";
long timezone = -5;
byte daysavetime = 0;
void listDir(fs::FS &fs, const char * dirname, uint8_t levels)
{//Begin
Serial.printf("Listing directory: %s\n", dirname);
File root = fs.open(dirname);
if(!root)
{//Begin
Serial.println("Failed to open directory");
return;
}// End
if(!root.isDirectory())
{//Begin
Serial.println("Not a directory");
return;
}// End
File file = root.openNextFile();
while(file)
{//Begin
if(file.isDirectory())
{//Begin
Serial.print(" DIR : ");
Serial.print (file.name());
time_t t= file.getLastWrite();
struct tm * tmstruct = localtime(&t);
Serial.printf(" LAST WRITE: %d-%02d-%02d %02d:%02d:%02d\n",(tmstruct->tm_year)+1900,( tmstruct->tm_mon)+1, tmstruct->tm_mday,tmstruct->tm_hour , tmstruct->tm_min, tmstruct->tm_sec);
if(levels)
{listDir(fs, file.path(), levels -1);}
}// End
else
{//Begin
Serial.print(" FILE: ");
Serial.print(file.name());
Serial.print(" SIZE: ");
Serial.print(file.size());
time_t t= file.getLastWrite();
struct tm * tmstruct = localtime(&t);
Serial.printf(" LAST WRITE: %d-%02d-%02d %02d:%02d:%02d\n",(tmstruct->tm_year)+1900,( tmstruct->tm_mon)+1, tmstruct->tm_mday,tmstruct->tm_hour , tmstruct->tm_min, tmstruct->tm_sec);
}// End
file = root.openNextFile();
}// End
}// End
void createDir(fs::FS &fs, const char * path)
{//Begin
Serial.printf("Creating Dir: %s\n", path);
if(fs.mkdir(path))
{Serial.println("Dir created");}
else
{Serial.println("mkdir failed");}
}// End
void removeDir(fs::FS &fs, const char * path)
{//Begin
Serial.printf("Removing Dir: %s\n", path);
if(fs.rmdir(path))
{Serial.println("Dir removed");}
else
{Serial.println("rmdir failed");}
}// End
void readFile(fs::FS &fs, const char * path)
{//Begin
Serial.printf("Reading file: %s\n", path);
File file = fs.open(path);
if(!file)
{//Begin
Serial.println("Failed to open file for reading");
return;
}// End
Serial.print("Read from file: ");
while(file.available())
{Serial.write(file.read());}
file.close();
}// End
void writeFile(fs::FS &fs, const char * path, const char * message)
{//Begin
Serial.printf("Writing file: %s\n", path);
File file = fs.open(path, FILE_WRITE);
if(!file)
{//Begin
Serial.println("Failed to open file for writing");
return;
}// End
if(file.print(message))
{Serial.println("File written");}
else
{Serial.println("Write failed");}
file.close();
}// End
void appendFile(fs::FS &fs, const char * path, const char * message)
{//Begin
Serial.printf("Appending to file: %s\n", path);
File file = fs.open(path, FILE_APPEND);
if(!file)
{//Begin
Serial.println("Failed to open file for appending");
return;
}// End
if(file.print(message))
{Serial.println("Message appended");}
else
{Serial.println("Append failed");}
file.close();
}// End
void renameFile(fs::FS &fs, const char * path1, const char * path2)
{//Begin
Serial.printf("Renaming file %s to %s\n", path1, path2);
if (fs.rename(path1, path2))
{Serial.println("File renamed");}
else
{Serial.println("Rename failed");}
}// End
void deleteFile(fs::FS &fs, const char * path)
{//Begin
Serial.printf("Deleting file: %s\n", path);
if(fs.remove(path))
{Serial.println("File deleted");}
else
{Serial.println("Delete failed");}
}// End
void setup()
{//Begin
Serial.begin(19200);
// We start by connecting to a WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{//Begin
delay(500);
Serial.print(".");
}// End
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
Serial.println("Contacting Time Server");
configTime(3600*timezone, daysavetime*3600, "time.nist.gov", "0.pool.ntp.org", "1.pool.ntp.org");
struct tm tmstruct ;
delay(2000);
tmstruct.tm_year = 0;
getLocalTime(&tmstruct, 5000);
Serial.printf("\nNow is : %d-%02d-%02d %02d:%02d:%02d\n",(tmstruct.tm_year)+1900,( tmstruct.tm_mon)+1, tmstruct.tm_mday,tmstruct.tm_hour , tmstruct.tm_min, tmstruct.tm_sec);
Serial.println("");
if(!SD.begin(SD_chipSelect))
{//Begin
Serial.println("Card Mount Failed");
return;
}// End
uint8_t cardType = SD.cardType();
if(cardType == CARD_NONE)
{//Begin
Serial.println("No SD card attached");
return;
}// End
Serial.print("SD 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.cardSize() / (1024 * 1024);
Serial.printf("SD Card Size: %lluMB\n", cardSize);
listDir(SD, "/", 0);
removeDir(SD, "/mydir");
createDir(SD, "/mydir");
deleteFile(SD, "/hello.txt");
writeFile(SD, "/hello.txt", "Hello ");
appendFile(SD, "/hello.txt", "World!\n");
listDir(SD, "/", 0);
Serial.printf("All Done!....");
}// End
void loop()
{}