SD.h Nano - can't read/write after directory listing (or vv)

hello

i have sketch using sd.h , serialcommand.h pass commands on serial create , write files (commands in sketch called csd, lsd, dsd).  this works fine.

i added command list files on sd card (sd).  this gets bit weird.

i can create, read , write files day long, if open root "/" doesn't return files - , read/write fails.

however, if open "/" after booting works fine.  until create/read , write files - "/" won't open more.  thought due not closing "/" - think closing correctly.


any ideas?  doing wrong?



code snippets: i've tried 2 methods list root directory structure:

 //first method read dir
   if (!card.init(spi_half_speed, 10)) {
   serial.println("initialization failed. things check:");
   serial.println("* card inserted?");
   serial.println("* wiring correct?");
   serial.println("* did change chipselect pin match shield or module?");
   return;
 } else {
  serial.println("wiring correct , card present.");
 }

  if (!volume.init(card)) {
    serial.println("could not find fat16/fat32 partition.\n\rmake sure you've formatted card");
  }
 root.openroot(volume);
 root.ls(ls_r | ls_date | ls_size);
 root.close();


and

//second method read dir
   myfile = sd.open("/");
   if(myfile) {
   printdirectory(myfile, 0);
   serial.println("done!");
   }
   myfile.close();
   return;

both give pretty same response.


any ideas?

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