Hi, I am newbie to this field. I tried to write a file into a SD card by using PlatformIO and doit esp32 devkit board. The result appears sucess. However, it didn’t work, I can’t see any files in the SD card after all. My code is down below. Thanks for your help.
#include “FS.h”
#include “SD.h”
#include “SPI.h”
void writeFile(fs::FS &fs, const char * path, const char * message){
Serial.printf(“Writing file: %s\n”, path);
File file = fs.open(path, FILE_WRITE);
if(!file){
Serial.println(“Failed to open file for writing”);
return;
}
if(file.print(message)){
Serial.println(“File written”);
} else {
Serial.println(“Write failed”);
}
file.close();
}
void setup(){
Serial.begin(115200);
if(!SD.begin(5)){
Serial.println(“Card Mount Failed”);
return;
}
uint8_t cardType = SD.cardType();
if(cardType == CARD_NONE){
Serial.println(“No SD card attached”);
return;
}
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);
}
void loop(){
writeFile(SD, “hello.txt”, "hello ");
Serial.printf(“write done”);
}