Arduino GIGA USB OTG

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1

Hi, i am trying to read root directory from my thumb drive connected to USB-A on my Arduino board, however I still receive error -19 "No such device".

I am using code directly from "cheat sheet", I've already tried 3 different thumb drives - all formatted to FAT32 (their capacity: 2GB, 4GB and 4GB). I've tried to upgrade Arduino_USBHostMbed5 library to 0.0.4 and still the same :-/

Did any of you encounter similar issue?

Thanks
Lukas

2

Is your USB drive named as in the arduino code?

3

OH NO, dont tell me, I've made this stupid mistake :D, so mbed::FATFileSystem usb("USB_DRIVE_DESIGNATION"), flash drive has to be named "USB_DRIVE_DESIGNATION"?

Will try and let you know :slight_smile:

1 Like
4

Either that, or I think you can just rename the line in code

5

Oh yeah, I thought that "if I run exactly that code, the thumb drive should be named like that..." :slight_smile:

I dont think issues is in this however, because it didnt help. Error -19 occurs while trying to read root dir - so msb is connected. I am attaching my complete sketch and output on serial line:

#include <FATFileSystem.h>
#include <Arduino_USBHostMbed5.h> //doinstalovat pomoci LibraryManageru

USBHostMSD msd;
mbed::FATFileSystem usb("MCDONALDS"); //toto je jakesi "designation", ktere pote musime pouzit v pripade prace se soubory
//FILE *f = fopen("/usb/text.txt", "r+");

void setup()
{
  Serial.begin(115200);
  while (!Serial);

  Serial.println("\n\n");

  Serial.println("Setting PA_15 and enabling USB-A port");
  pinMode(PA_15, OUTPUT); //enable the USB-A port
  digitalWrite(PA_15, HIGH);

  while (!msd.connect()) {
    Serial.println("Connecting msb");
    delay(1000);
  }
  Serial.println("\t...done");

  Serial.println("Mounting USB device...");
  int err = usb.mount(&msd);
  if (err)
  {
    Serial.print("Error while mounting on USB drive, code: ");
    Serial.println(err);
    while (true); 
  }
  Serial.println("\t...done");

 rootDirDisplay();
}

void loop() {

}

void rootDirDisplay()
{
    Serial.println("Opening the root directory... ");
    DIR* d = opendir("/usb/");
    char buf[256];
    if (!d)
    {
      snprintf(buf, sizeof(buf), "Fail, error: %s (%d)\r\n", strerror(errno), -errno);
      Serial.print(buf);
    }
    else
    {
      Serial.println("...\tdone");
      Serial.println("Root directory:");
      unsigned int count { 0 };

      while (true)
      {
        struct dirent* e = readdir(d);
        if (!e)
          break;
        count++;
        snprintf(buf, sizeof(buf), "    %s\r\n", e->d_name);
        Serial.print(buf);
      }
      Serial.print(count);
      Serial.println(" files found!");

      snprintf(buf, sizeof(buf), "Closing the root directory... ");
      Serial.print(buf);

      fflush(stdout);
      int err = closedir(d);
      snprintf(buf, sizeof(buf), "%s\r\n", (err < 0 ? "Fail :(" : "OK"));
      Serial.print(buf);
      if (err < 0)
      {
        snprintf(buf, sizeof(buf), "error: %s (%d)\r\n", strerror(errno), -errno);
        Serial.print(buf);
      }
    }
}

void readFile()
{
  mbed::fs_file_t file;
  struct dirent *ent;
  int dirIndex = 0;
  int res = 0;
  
  Serial.println("Open file..");
  FILE *f = fopen("/usb/Arduino.txt", "r+");
  char buf[256];
  
  Serial.println("File content:");
  while (fgets(buf, 256, f) != NULL)
  {
    Serial.print(buf);
  }
  Serial.println("File closing");
  res = fclose(f);
}

Setting PA_15 and enabling USB-A port
Connecting msb
Connecting msb
...done
Mounting USB device...
...done
Opening the root directory...
Fail, error: No such device (-19)

6

Soooo, if by any chance someone will be stuck on similar issue, the solution is here:

mbed::FATFileSystem usb("usb");

In constructor you have to specify DESIGNATION, which is "usb" - since you are using usb :smiley: