Pràctiques de «Tecnologia i digitalització» amb Wemos D1 R32 i Arduino IDE
Test targeta SD
Fes el següent muntatge:

1) Abans de provar res cal que formates la targeta MiscroSHDC al format FAT32 amb l'ordinador.
2) Algunes SD_card admeten el voltatge de 3.3V , mentre que altres admeten el voltatge de 5V. Mira la web del fabricant.
3) Fes el muntatge.
4) Prova el programa per veure si es pot detectar la targeta.
/*
Autor: Rui Santos
Font: https://RandomNerdTutorials.com/esp32-microsd-card-arduino/
*/
#include "FS.h"
#include "SD.h"
#include "SPI.h"
const int chipSelect = SS;//10;
void listDir(fs::FS &fs, const char * dirname, uint8_t levels){
Serial.println("LISTDIR.....");
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.name(), 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.println("CREATEDIR.....");
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.println("REMOVEDIR.....");
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.println("READFILE.....");
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);
Serial.println("WRITEFILE.....");
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.println("APPENDFILE.....");
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.println("RENAMEFILE.....");
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.println("DELETEFILE.....");
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){
Serial.println("TESTFILEIO.....");
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);
delay(2000);
if(!SD.begin(SS)){
// 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;
}
delay(2000);
Serial.println("TIPO DE TARJETA...");
Serial.print("SD Card Type: ");
if(cardType == CARD_MMC){
Serial.println("MMC");
} else if(cardType == CARD_SD){
Serial.println("SDSC"); //ESTA
} else if(cardType == CARD_SDHC){
Serial.println("SDHC");
} else {
Serial.println("UNKNOWN");
}
delay(2000);
Serial.println("TAMAÑO TARJETA...");
uint64_t cardSize = SD.cardSize() / (1024 * 1024);
Serial.printf("SD Card Size: %lluMB\n", cardSize); //1910MB
listDir(SD, "/", 0);
delay(2000);
createDir(SD, "/mydir");
delay(2000);
listDir(SD, "/", 0);
delay(2000);
removeDir(SD, "/mydir");
delay(2000);
listDir(SD, "/", 2);
delay(2000);
writeFile(SD, "/hello.txt", "Hello ");
delay(2000);
appendFile(SD, "/hello.txt", "World!\n");
delay(2000);
readFile(SD, "/hello.txt");
delay(2000);
deleteFile(SD, "/foo.txt");
delay(2000);
renameFile(SD, "/hello.txt", "/foo.txt");
delay(2000);
readFile(SD, "/foo.txt");
delay(2000);
testFileIO(SD, "/test.txt");
delay(2000);
delay(2000);
Serial.println("ESPACIO LIBRE TARJETA..");
Serial.printf("Total space: %lluMB\n", SD.totalBytes() / (1024 * 1024));
Serial.printf("Used space: %lluMB\n", SD.usedBytes() / (1024 * 1024));
}
void loop(){
//nada que hacer
delay(20000);
Serial.println("OTRO BUCLE MAS");
}// Final del programa
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Quan executem el programa veurem una eixida com aquesta o semblant.

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