Sub directories of SD from user input

Projects Programming
1

Hello,

I have been trying to write a program which prints the contents of an SD card (able to do that from the examples given). After printing the card contents, I am want for the user to be able to type in a directory on the card within the serial monitor. Then the contents of the Sd card should be searched, if there is a match between what the user typed and a file on the card - this should then open that directory into a sub directory, the user then being able to select one of the specific files in that sub-directory.

This is what I have so far, I am able to type in the initial directory. I think the problem lies within the line

File userInput = printSound.openNextFile();

As it always opens the first directory on the card and not the one the user has typed in.

here is the rest of the code:

#include <Arduino.h>
#include <SD.h>
#include <SdFat.h>
#include <Audio.h>
#include <String.h>

//#define _SD_DAT3 46

#define numSampleFiles 12
//File root;
File currentDirectory;
File soundDirectory;

String fileExtension = ".wav";
String userInput;
char dataChar[16] = {'\0'};



char fileNameBuff[80]; //Vector<string> filenames;
char newfileNameBuff[80];
char rootSampleDir[25];
samples samps [numSampleFiles];
const long maxSampleLength = 1200000;
int numItems;

void printDir(File currentDirectory, int numTabs);
void scanFile(File printSound);

#define MOSI_PIN 11
#define SCK_PIN 13
#define CS_PIN = BUILTIN_SDCARD

void setup()
{

 Serial.begin(9600);
 //SPI.setMOSI(MOSI_PIN);
 //SPI.setSCK(SCK_PIN);

  while(!Serial);

  Serial.println("Initializing MicroSD"); // Message whilst waiting for the SD card to be inserted
  if (!SD.begin(BUILTIN_SDCARD))                  // If not inserted
  {
    Serial.println("MicroSD card not initialized"); // Infinite Loop so that it is clear no SD card has been inserted
    while (1);
  }
  Serial.println("MicroSD card initialized!"); // otherwise print message to show it has been inserted

  currentDirectory = SD.open("/");
  
  soundDirectory = SD.open("/");
  
  printDir(currentDirectory, 0);
  
  scanFile(soundDirectory);

  
  for (int i = 0; i < numSampleFiles; i++)
  {
    sprintf(samps[i].fileName, "S%d.wav", i+1);
    if (!SerialFlash.exists(samps[i].fileName)){
      SerialFlash.createErasable(samps[i].fileName, maxSampleLength);
    }
  }
  

  //See what's in our root Sample directory
  sprintf(fileNameBuff, "/");
  sprintf(rootSampleDir, "/");

  //currentDirectory = SD.open(rootSampleDir);
  //printDir(currentDirectory, 0);

  Serial.println("contents printed");
  
}


void printDir(File dir, int numTabs)
{
  //Serial.println("TESTING");
  while(true) 
  {

    File entry = dir.openNextFile();

     if (!entry) 
     {
      //currentDirectory.rewindDirectory(); //This gets stick in a constant loop?
      break;
     }
     
     else
     {
      numItems = numItems+1;
     }
     
      for(uint8_t i = 0; i < numTabs; i++)
      {
       Serial.print('\t');
      }
      Serial.print(entry.name());
      if(entry.isDirectory())
      {
        Serial.println("/");
        printDir(entry, numTabs + 1);
      }
      else
      {
        Serial.print("\t\t");
      }    
      delay(1);
    entry.close();
  }
  

  
   


void scanFile(File printSound)
{
  Serial.println("\nPlease type in a directory: ");
  while(Serial.available()==0)
  {
    //This keeps the serial looped until something is typed
  }

  
  while(1)
  {

    userInput = Serial.readString(); //Takes user input
    Serial.println(userInput);       //prints user input

    //File select = printSound.openNextFile();
    File userInput = printSound.openNextFile(); //Maybe this should be open SELECT file - not just next?
    
    

    Serial.println(userInput.name());

    if(userInput.isDirectory())
    {
      Serial.println("/");
      scanFile(userInput); 
      
      Serial.println("selected directory is: " + userInput);            
    }
      
  }

hope this makes sense. Thanks!
J

2

so you read in something in your String and the next line you define a local variable with the same name and of type File and just go to next file regardless of what the user typed in?

how is that supposed to work?

3

Okay, yes I see what your saying. I'm unsure how to check if there is a directory with the same name the user typed in and then open it if so? Would I have to declare a new function which says
if there is a directory
SD.open(...?)

4

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