Libraries: modernize USBMSD library

Author: facchinm

libraries/USBMSD/examples/AccessFlashAsUSBDisk/AccessFlashAsUSBDisk.ino

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+/*
+   QSPI as USB Mass Storage
+   This example shows how to expose a QSPIF BlockDevice (16MB external flash on the Portenta H7)
+   as an USB stick. It can be adapted to any kind of BlockDevice (FlashIAP or either RAM via HeapBlockDevice)
+   Before loading this example, make sure you execute PortentWiFiFirmwareUpdater sketch
+   to create and format the proper partitions.
+*/
+
+#include "PluggableUSBMSD.h"
+#include "QSPIFBlockDevice.h"
+#include "MBRBlockDevice.h"
+#include "FATFileSystem.h"
+
+static QSPIFBlockDevice root;
+mbed::MBRBlockDevice wifi_data(&root, 1);
+mbed::MBRBlockDevice ota_data(&root, 2);
+static mbed::FATFileSystem wifi("wifi");
+static mbed::FATFileSystem ota("ota");
+
+void USBMSD::begin()
+{
+  int err = wifi.mount(&wifi_data);
+  if (err) {
+    while (!Serial);
+    Serial.println("Please run PortentWiFiFirmwareUpdater before");
+    return;
+  }
+  ota.mount(&ota_data);
+}
+
+
+USBMSD MassStorage(&root);
+
+void setup() {
+  Serial.begin(115200);
+  MassStorage.begin();
+}
+
+void printDirectory(char* name) {
+  DIR *d;
+  struct dirent *p;
+
+  d = opendir(name);
+  if (d != NULL) {
+    while ((p = readdir(d)) != NULL) {
+      Serial.println(p->d_name);
+    }
+  }
+  closedir(d);
+}
+
+void loop() {
+  if (MassStorage.media_removed()) {
+    // list the content of the partitions
+    // you may need to restart the board for the list to update if you copied new files
+    Serial.println("Content of WiFi partition:");
+    printDirectory("/wifi");
+    Serial.println("Content of OTA partition:");
+    printDirectory("/ota");
+  }
+  delay(1000);
+}

libraries/USBMSD/examples/Nano33BLE_FlashMassStorage/Nano33BLE_FlashMassStorage.ino

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+/*
+   This example exposes the second half (512KB) of Nano 33 BLE flash
+   as a USB disk.
+   The user can interact with this disk as a bidirectional communication with the board
+   For example, the board could save data in a file to be retrieved later with a drag and drop
+*/
+
+#include "PluggableUSBMSD.h"
+
+void setup() {
+  Serial.begin(115200);
+  MassStorage.begin();
+
+  // write a file with some data
+  // a+ means append, so every time the board is rebooted the file will grow by a new line
+  FILE *f = fopen("/fs/data.txt", "a+");
+  String hello = "Hello from Nano33BLE Filesystem\n";
+  fwrite(hello.c_str(), hello.length(), 1, f);
+  fclose(f);
+}
+
+void loop() {
+  delay(1000);
+}

libraries/USBMSD/library.properties

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+name=USB Mass Storage
+version=1.0
+author=Arduino
+maintainer=Arduino <info@arduino.cc>
+sentence=Allow exposing block devices as USB disk when connected to a PC
+paragraph=
+category=Data Storage
+url=https://github.com/arduino/ArduinoCore-mbed/tree/master/libraries/USBMSD
+architectures=mbed,mbed_portenta,mbed_nano,mbed_edge,mbed_rp2040