Part yang dibutuhkkan:
- ESP32 development board
- MicroSD Card Module
- MicroSD Card
- Jumper Wires
- Breadboard
Modul kartu microSD berkomunikasi menggunakan protokol komunikasi SPI. Anda dapat menghubungkannya ke ESP32 menggunakan pin SPI default.
| MicroSD card module | ESP32 |
| 3V3 | 3.3V |
| CS | GPIO 5 |
| MOSI | GPIO 23 |
| CLK | GPIO 18 |
| MISO | GPIO 19 |
| GND | GND |
Pada bagian ini, kami akan menunjukkan kepada Anda bagaimana menangani file dengan kartu microSD menggunakan ESP32 dan Arduino IDE. Kami akan menggunakan contoh pustaka SD untuk mendemonstrasikan semua fungsi penanganan file utama termasuk membaca, menghapus, menambahkan file, dll. Pustaka SD untuk ESP32 menggunakan pengontrol SPI.
Persiapan Micro SD Card Module
Sebelum memasukkan Kartu SD ke dalam modul pembaca kartu SD, Anda perlu memformat kartu dengan benar sebelum Anda benar-benar dapat menggunakannya, jika tidak, Anda akan mengalami masalah karena modul pembaca kartu SD hanya dapat membaca sistem file FAT16 atau FAT32. Jika kartu sd Anda baru maka kemungkinan besar kartu tersebut diformat pabrik, itu mungkin juga tidak berfungsi karena kartu pra-format dilengkapi dengan sistem file FAT, bagaimanapun juga, lebih baik memformat kartu lama untuk mengurangi masalah selama pengoperasian.
Ada beberapa contoh di Arduino IDE yang menunjukkan cara menangani file di kartu microSD menggunakan ESP32. Di Arduino IDE, buka File > Examples > SD(esp32) > SD_Test,
Program Micro SD Card Module
/** Connect the SD card to the following pins:** SD Card | ESP32* D2 -* D3 SS* CMD MOSI* VSS GND* VDD 3.3V* CLK SCK* VSS GND* D0 MISO* D1 -*/#include "FS.h"#include "SD.h"#include "SPI.h"void listDir(fs::FS &fs, const char * dirname, uint8_t levels){Serial.printf("Listing directory: %s\n", dirname);File root = fs.open(dirname);if(!root){Serial.println("Failed to open directory");return;}if(!root.isDirectory()){Serial.println("Not a directory");return;}File file = root.openNextFile();while(file){if(file.isDirectory()){Serial.print(" DIR : ");Serial.println(file.name());if(levels){listDir(fs, file.path(), levels -1);}} else {Serial.print(" FILE: ");Serial.print(file.name());Serial.print(" SIZE: ");Serial.println(file.size());}file = root.openNextFile();}}void createDir(fs::FS &fs, const char * path){Serial.printf("Creating Dir: %s\n", path);if(fs.mkdir(path)){Serial.println("Dir created");} else {Serial.println("mkdir failed");}}void removeDir(fs::FS &fs, const char * path){Serial.printf("Removing Dir: %s\n", path);if(fs.rmdir(path)){Serial.println("Dir removed");} else {Serial.println("rmdir failed");}}void readFile(fs::FS &fs, const char * path){Serial.printf("Reading file: %s\n", path);File file = fs.open(path);if(!file){Serial.println("Failed to open file for reading");return;}Serial.print("Read from file: ");while(file.available()){Serial.write(file.read());}file.close();}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 appendFile(fs::FS &fs, const char * path, const char * message){Serial.printf("Appending to file: %s\n", path);File file = fs.open(path, FILE_APPEND);if(!file){Serial.println("Failed to open file for appending");return;}if(file.print(message)){Serial.println("Message appended");} else {Serial.println("Append failed");}file.close();}void renameFile(fs::FS &fs, const char * path1, const char * path2){Serial.printf("Renaming file %s to %s\n", path1, path2);if (fs.rename(path1, path2)) {Serial.println("File renamed");} else {Serial.println("Rename failed");}}void deleteFile(fs::FS &fs, const char * path){Serial.printf("Deleting file: %s\n", path);if(fs.remove(path)){Serial.println("File deleted");} else {Serial.println("Delete failed");}}void testFileIO(fs::FS &fs, const char * path){File file = fs.open(path);static uint8_t buf[512];size_t len = 0;uint32_t start = millis();uint32_t end = start;if(file){len = file.size();size_t flen = len;start = millis();while(len){size_t toRead = len;if(toRead > 512){toRead = 512;}file.read(buf, toRead);len -= toRead;}end = millis() - start;Serial.printf("%u bytes read for %u ms\n", flen, end);file.close();} else {Serial.println("Failed to open file for reading");}file = fs.open(path, FILE_WRITE);if(!file){Serial.println("Failed to open file for writing");return;}size_t i;start = millis();for(i=0; i<2048; i++){file.write(buf, 512);}end = millis() - start;Serial.printf("%u bytes written for %u ms\n", 2048 * 512, end);file.close();}void setup(){Serial.begin(115200);if(!SD.begin()){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);listDir(SD, "/", 0);createDir(SD, "/mydir");listDir(SD, "/", 0);removeDir(SD, "/mydir");listDir(SD, "/", 2);writeFile(SD, "/hello.txt", "Hello ");appendFile(SD, "/hello.txt", "World!\n");readFile(SD, "/hello.txt");deleteFile(SD, "/foo.txt");renameFile(SD, "/hello.txt", "/foo.txt");readFile(SD, "/foo.txt");testFileIO(SD, "/test.txt");Serial.printf("Total space: %lluMB\n", SD.totalBytes() / (1024 * 1024));Serial.printf("Used space: %lluMB\n", SD.usedBytes() / (1024 * 1024));}void loop(){}Hasil Akan ditampilkan pada Serial Monitor
