diff --git a/examples/CDC/no_serial/no_serial.ino b/examples/CDC/no_serial/no_serial.ino
index c7538d5b..6883a444 100644
--- a/examples/CDC/no_serial/no_serial.ino
+++ b/examples/CDC/no_serial/no_serial.ino
@@ -23,6 +23,11 @@ int led = LED_BUILTIN;
 
 void setup()
 {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
+
   // clear configuration will remove all USB interfaces including CDC (Serial)
   TinyUSBDevice.clearConfiguration();
 
@@ -31,8 +36,16 @@ void setup()
 
 void loop()
 {
-  digitalWrite(led, HIGH);
-  delay(1000);
-  digitalWrite(led, LOW);
-  delay(1000);
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+
+  // toggle LED
+  static uint32_t ms = 0;
+  static uint8_t led_state = 0;
+  if (millis() - ms > 1000) {
+    ms = millis();
+    digitalWrite(LED_BUILTIN, 1-led_state);
+  }
 }
diff --git a/examples/Composite/mouse_external_flash/.feather52833.test.skip b/examples/Composite/mouse_external_flash/.feather52833.test.skip
deleted file mode 100644
index e69de29b..00000000
diff --git a/examples/Composite/mouse_external_flash/.pico_rp2040_tinyusb_host.test.skip b/examples/Composite/mouse_external_flash/.pico_rp2040_tinyusb_host.test.skip
deleted file mode 100644
index e69de29b..00000000
diff --git a/examples/Composite/mouse_external_flash/mouse_external_flash.ino b/examples/Composite/mouse_external_flash/mouse_external_flash.ino
deleted file mode 100644
index 8cdbbb1d..00000000
--- a/examples/Composite/mouse_external_flash/mouse_external_flash.ino
+++ /dev/null
@@ -1,200 +0,0 @@
-/*********************************************************************
- Adafruit invests time and resources providing this open source code,
- please support Adafruit and open-source hardware by purchasing
- products from Adafruit!
-
- MIT license, check LICENSE for more information
- Copyright (c) 2019 Ha Thach for Adafruit Industries
- All text above, and the splash screen below must be included in
- any redistribution
-*********************************************************************/
-
-/* This sketch demonstrates USB Mass Storage and HID mouse (and CDC)
- * - Enumerated as disk using on-board external flash
- * - Press button pin will move mouse toward bottom right of monitor
- */
-
-#include "SPI.h"
-#include "SdFat.h"
-#include "Adafruit_SPIFlash.h"
-#include "Adafruit_TinyUSB.h"
-
-//--------------------------------------------------------------------+
-// MSC External Flash Config
-//--------------------------------------------------------------------+
-
-// Un-comment to run example with custom SPI SPI and SS e.g with FRAM breakout
-// #define CUSTOM_CS   A5
-// #define CUSTOM_SPI  SPI
-
-#if defined(CUSTOM_CS) && defined(CUSTOM_SPI)
-  Adafruit_FlashTransport_SPI flashTransport(CUSTOM_CS, CUSTOM_SPI);
-
-#elif defined(ARDUINO_ARCH_ESP32)
-  // ESP32 use same flash device that store code.
-  // Therefore there is no need to specify the SPI and SS
-  Adafruit_FlashTransport_ESP32 flashTransport;
-
-#elif defined(ARDUINO_ARCH_RP2040)
-  // RP2040 use same flash device that store code.
-  // Therefore there is no need to specify the SPI and SS
-  // Use default (no-args) constructor to be compatible with CircuitPython partition scheme
-  Adafruit_FlashTransport_RP2040 flashTransport;
-
-  // For generic usage:
-  //    Adafruit_FlashTransport_RP2040 flashTransport(start_address, size)
-  // If start_address and size are both 0, value that match filesystem setting in
-  // 'Tools->Flash Size' menu selection will be used
-
-#else
-  // On-board external flash (QSPI or SPI) macros should already
-  // defined in your board variant if supported
-  // - EXTERNAL_FLASH_USE_QSPI
-  // - EXTERNAL_FLASH_USE_CS/EXTERNAL_FLASH_USE_SPI
-  #if defined(EXTERNAL_FLASH_USE_QSPI)
-    Adafruit_FlashTransport_QSPI flashTransport;
-
-  #elif defined(EXTERNAL_FLASH_USE_SPI)
-    Adafruit_FlashTransport_SPI flashTransport(EXTERNAL_FLASH_USE_CS, EXTERNAL_FLASH_USE_SPI);
-
-  #else
-    #error No QSPI/SPI flash are defined on your board variant.h !
-  #endif
-#endif
-
-Adafruit_SPIFlash flash(&flashTransport);
-
-Adafruit_USBD_MSC usb_msc;
-
-//--------------------------------------------------------------------+
-// HID Config
-//--------------------------------------------------------------------+
-
-// HID report descriptor using TinyUSB's template
-// Single Report (no ID) descriptor
-uint8_t const desc_hid_report[] = {
-    TUD_HID_REPORT_DESC_MOUSE()
-};
-
-// USB HID object
-Adafruit_USBD_HID usb_hid;
-
-#if defined(ARDUINO_SAMD_CIRCUITPLAYGROUND_EXPRESS) || defined(ARDUINO_NRF52840_CIRCUITPLAY)
-  const int pin = 4; // Left Button
-  bool activeState = true;
-
-#elif defined(ARDUINO_FUNHOUSE_ESP32S2)
-  const int pin = BUTTON_DOWN;
-  bool activeState = true;
-
-#elif defined PIN_BUTTON1
-  const int pin = PIN_BUTTON1;
-  bool activeState = false;
-
-#elif defined(ARDUINO_ARCH_ESP32)
-  const int pin = 0;
-  bool activeState = false;
-
-#else
-  const int pin = 12;
-  bool activeState = false;
-#endif
-
-
-// the setup function runs once when you press reset or power the board
-void setup()
-{
-#if defined(ARDUINO_ARCH_MBED) && defined(ARDUINO_ARCH_RP2040)
-  // Manual begin() is required on core without built-in support for TinyUSB such as mbed rp2040
-  TinyUSB_Device_Init(0);
-#endif
-
-  flash.begin();
-
-  pinMode(LED_BUILTIN, OUTPUT);
-
-  // Set disk vendor id, product id and revision with string up to 8, 16, 4 characters respectively
-  usb_msc.setID("Adafruit", "External Flash", "1.0");
-
-  // Set callback
-  usb_msc.setReadWriteCallback(msc_read_cb, msc_write_cb, msc_flush_cb);
-
-  // Set disk size, block size should be 512 regardless of spi flash page size
-  usb_msc.setCapacity(flash.size()/512, 512);
-
-  // MSC is ready for read/write
-  usb_msc.setUnitReady(true);
-  
-  usb_msc.begin();
-
-  // Set up button
-  pinMode(pin, activeState ? INPUT_PULLDOWN : INPUT_PULLUP);
-
-  // Set up HID
-  usb_hid.setReportDescriptor(desc_hid_report, sizeof(desc_hid_report));
-  usb_hid.setBootProtocol(HID_ITF_PROTOCOL_NONE);
-  usb_hid.setPollInterval(2);
-  usb_hid.begin();
-
-  Serial.begin(115200);
-  //while ( !Serial ) delay(10);   // wait for native usb
-
-  Serial.println("Adafruit TinyUSB Mouse + Mass Storage (external flash) example");
-}
-
-void loop()
-{
-  // poll gpio once each 10 ms
-  delay(10);
-
-  // button is active low
-  uint32_t const btn = (digitalRead(pin) == activeState);
-
-  // Remote wakeup
-  if ( TinyUSBDevice.suspended() && btn )
-  {
-    // Wake up host if we are in suspend mode
-    // and REMOTE_WAKEUP feature is enabled by host
-    tud_remote_wakeup();
-  }
-
-  /*------------- Mouse -------------*/
-  if ( usb_hid.ready() )
-  {
-    if ( btn )
-    {
-      int8_t const delta = 5;
-      usb_hid.mouseMove(0, delta, delta); // no ID: right + down
-
-      // delay a bit before attempt to send keyboard report
-      delay(10);
-    }
-  }
-}
-
-// Callback invoked when received READ10 command.
-// Copy disk's data to buffer (up to bufsize) and 
-// return number of copied bytes (must be multiple of block size) 
-int32_t msc_read_cb (uint32_t lba, void* buffer, uint32_t bufsize)
-{
-  // Note: SPIFLash Bock API: readBlocks/writeBlocks/syncBlocks
-  // already include 4K sector caching internally. We don't need to cache it, yahhhh!!
-  return flash.readBlocks(lba, (uint8_t*) buffer, bufsize/512) ? bufsize : -1;
-}
-
-// Callback invoked when received WRITE10 command.
-// Process data in buffer to disk's storage and 
-// return number of written bytes (must be multiple of block size)
-int32_t msc_write_cb (uint32_t lba, uint8_t* buffer, uint32_t bufsize)
-{
-  // Note: SPIFLash Bock API: readBlocks/writeBlocks/syncBlocks
-  // already include 4K sector caching internally. We don't need to cache it, yahhhh!!
-  return flash.writeBlocks(lba, buffer, bufsize/512) ? bufsize : -1;
-}
-
-// Callback invoked when WRITE10 command is completed (status received and accepted by host).
-// used to flush any pending cache.
-void msc_flush_cb (void)
-{
-  flash.syncBlocks();
-}
diff --git a/examples/Composite/mouse_ramdisk/mouse_ramdisk.ino b/examples/Composite/mouse_ramdisk/mouse_ramdisk.ino
index 09da8690..08c6e113 100644
--- a/examples/Composite/mouse_ramdisk/mouse_ramdisk.ino
+++ b/examples/Composite/mouse_ramdisk/mouse_ramdisk.ino
@@ -23,6 +23,7 @@
 // 8KB is the smallest size that windows allow to mount
 #define DISK_BLOCK_NUM  16
 #define DISK_BLOCK_SIZE 512
+
 #include "ramdisk.h"
 
 Adafruit_USBD_MSC usb_msc;
@@ -41,37 +42,41 @@ uint8_t const desc_hid_report[] = {
 Adafruit_USBD_HID usb_hid;
 
 #if defined(ARDUINO_SAMD_CIRCUITPLAYGROUND_EXPRESS) || defined(ARDUINO_NRF52840_CIRCUITPLAY)
-  const int pin = 4; // Left Button
-  bool activeState = true;
+const int pin = 4; // Left Button
+bool activeState = true;
 
 #elif defined(ARDUINO_FUNHOUSE_ESP32S2)
-  const int pin = BUTTON_DOWN;
-  bool activeState = true;
+const int pin = BUTTON_DOWN;
+bool activeState = true;
 
 #elif defined PIN_BUTTON1
-  const int pin = PIN_BUTTON1;
-  bool activeState = false;
+const int pin = PIN_BUTTON1;
+bool activeState = false;
 
 #elif defined(ARDUINO_ARCH_ESP32)
-  const int pin = 0;
-  bool activeState = false;
+const int pin = 0;
+bool activeState = false;
+
+#elif defined(ARDUINO_ARCH_RP2040)
+const int pin = D0;
+bool activeState = false;
 
 #else
-  const int pin = 12;
-  bool activeState = false;
+const int pin = A0;
+bool activeState = false;
 #endif
 
+
 // the setup function runs once when you press reset or power the board
-void setup()
-{
-#if defined(ARDUINO_ARCH_MBED) && defined(ARDUINO_ARCH_RP2040)
-  // Manual begin() is required on core without built-in support for TinyUSB such as mbed rp2040
-  TinyUSB_Device_Init(0);
-#endif
+void setup() {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
 
   // Set disk vendor id, product id and revision with string up to 8, 16, 4 characters respectively
   usb_msc.setID("Adafruit", "Mass Storage", "1.0");
-  
+
   // Set disk size
   usb_msc.setCapacity(DISK_BLOCK_NUM, DISK_BLOCK_SIZE);
 
@@ -80,7 +85,7 @@ void setup()
 
   // Set Lun ready (RAM disk is always ready)
   usb_msc.setUnitReady(true);
-  
+
   usb_msc.begin();
 
   // Set up button
@@ -93,32 +98,23 @@ void setup()
   usb_hid.begin();
 
   Serial.begin(115200);
-  while( !TinyUSBDevice.mounted() ) delay(1);   // wait for native usb
-
   Serial.println("Adafruit TinyUSB Mouse + Mass Storage (ramdisk) example");
 }
 
-void loop()
-{
-  // poll gpio once each 10 ms
-  delay(10);
-
+void process_hid() {
   // button is active low
   uint32_t const btn = (digitalRead(pin) == activeState);
 
   // Remote wakeup
-  if ( TinyUSBDevice.suspended() && btn )
-  {
+  if (TinyUSBDevice.suspended() && btn) {
     // Wake up host if we are in suspend mode
     // and REMOTE_WAKEUP feature is enabled by host
     tud_remote_wakeup();
   }
 
   /*------------- Mouse -------------*/
-  if ( usb_hid.ready() )
-  {
-    if ( btn )
-    {
+  if (usb_hid.ready()) {
+    if (btn) {
       int8_t const delta = 5;
       usb_hid.mouseMove(0, delta, delta); // no ID: right + down
 
@@ -128,11 +124,29 @@ void loop()
   }
 }
 
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+
+  // not enumerated()/mounted() yet: nothing to do
+  if (!TinyUSBDevice.mounted()) {
+    return;
+  }
+
+  // poll gpio once each 10 ms
+  static uint32_t ms = 0;
+  if (millis() - ms > 10) {
+    ms = millis();
+    process_hid();
+  }
+}
+
 // Callback invoked when received READ10 command.
 // Copy disk's data to buffer (up to bufsize) and 
 // return number of copied bytes (must be multiple of block size) 
-int32_t msc_read_cb (uint32_t lba, void* buffer, uint32_t bufsize)
-{
+int32_t msc_read_cb(uint32_t lba, void* buffer, uint32_t bufsize) {
   uint8_t const* addr = msc_disk[lba];
   memcpy(buffer, addr, bufsize);
 
@@ -142,8 +156,7 @@ int32_t msc_read_cb (uint32_t lba, void* buffer, uint32_t bufsize)
 // Callback invoked when received WRITE10 command.
 // Process data in buffer to disk's storage and 
 // return number of written bytes (must be multiple of block size)
-int32_t msc_write_cb (uint32_t lba, uint8_t* buffer, uint32_t bufsize)
-{
+int32_t msc_write_cb(uint32_t lba, uint8_t* buffer, uint32_t bufsize) {
   uint8_t* addr = msc_disk[lba];
   memcpy(addr, buffer, bufsize);
 
@@ -152,7 +165,6 @@ int32_t msc_write_cb (uint32_t lba, uint8_t* buffer, uint32_t bufsize)
 
 // Callback invoked when WRITE10 command is completed (status received and accepted by host).
 // used to flush any pending cache.
-void msc_flush_cb (void)
-{
+void msc_flush_cb(void) {
   // nothing to do
 }
diff --git a/examples/HID/hid_boot_keyboard/hid_boot_keyboard.ino b/examples/HID/hid_boot_keyboard/hid_boot_keyboard.ino
index c5bca727..38395220 100644
--- a/examples/HID/hid_boot_keyboard/hid_boot_keyboard.ino
+++ b/examples/HID/hid_boot_keyboard/hid_boot_keyboard.ino
@@ -10,10 +10,9 @@
 *********************************************************************/
 
 #include "Adafruit_TinyUSB.h"
-#include <Adafruit_NeoPixel.h>
 
 /* This sketch demonstrates USB HID keyboard.
- * - PIN A0-A5 is used to send digit '0' to '5' respectively
+ * - PIN A0-A3 is used to send digit '0' to '3' respectively
  *   (On the RP2040, pins D0-D5 used)
  * - LED and/or Neopixels will be used as Capslock indicator
  */
@@ -21,7 +20,7 @@
 // HID report descriptor using TinyUSB's template
 // Single Report (no ID) descriptor
 uint8_t const desc_hid_report[] = {
-  TUD_HID_REPORT_DESC_KEYBOARD()
+    TUD_HID_REPORT_DESC_KEYBOARD()
 };
 
 // USB HID object. For ESP32 these values cannot be changed after this declaration
@@ -32,45 +31,29 @@ Adafruit_USBD_HID usb_hid;
 // Array of pins and its keycode.
 // Notes: these pins can be replaced by PIN_BUTTONn if defined in setup()
 #ifdef ARDUINO_ARCH_RP2040
-  uint8_t pins[] = { D0, D1, D2, D3 };
+uint8_t pins[] = { D0, D1, D2, D3 };
 #else
-  uint8_t pins[] = { A0, A1, A2, A3 };
+uint8_t pins[] = {A0, A1, A2, A3};
 #endif
 
 // number of pins
-uint8_t pincount = sizeof(pins)/sizeof(pins[0]);
+uint8_t pincount = sizeof(pins) / sizeof(pins[0]);
 
 // For keycode definition check out https://github.com/hathach/tinyusb/blob/master/src/class/hid/hid.h
-uint8_t hidcode[] = { HID_KEY_ARROW_RIGHT, HID_KEY_ARROW_LEFT, HID_KEY_ARROW_DOWN, HID_KEY_ARROW_UP };
+uint8_t hidcode[] = {HID_KEY_0, HID_KEY_1, HID_KEY_2, HID_KEY_3};
 
 #if defined(ARDUINO_SAMD_CIRCUITPLAYGROUND_EXPRESS) || defined(ARDUINO_NRF52840_CIRCUITPLAY) || defined(ARDUINO_FUNHOUSE_ESP32S2)
-  bool activeState = true;
+bool activeState = true;
 #else
-  bool activeState = false;
+bool activeState = false;
 #endif
 
-//------------- Neopixel -------------//
-// #define PIN_NEOPIXEL  8
-#ifdef PIN_NEOPIXEL
-
-// How many NeoPixels are attached to the Arduino?
-// use on-board defined NEOPIXEL_NUM if existed
-#ifndef NEOPIXEL_NUM
-  #define NEOPIXEL_NUM  10
-#endif
-
-Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NEOPIXEL_NUM, PIN_NEOPIXEL, NEO_GRB + NEO_KHZ800);
-
-#endif
-
-
 // the setup function runs once when you press reset or power the board
-void setup()
-{
-#if defined(ARDUINO_ARCH_MBED) && defined(ARDUINO_ARCH_RP2040)
-  // Manual begin() is required on core without built-in support for TinyUSB such as mbed rp2040
-  TinyUSB_Device_Init(0);
-#endif
+void setup() {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
 
   // Setup HID
   usb_hid.setBootProtocol(HID_ITF_PROTOCOL_KEYBOARD);
@@ -87,17 +70,6 @@ void setup()
   pinMode(LED_BUILTIN, OUTPUT);
   digitalWrite(LED_BUILTIN, LOW);
 
-  // neopixel if existed
-#ifdef PIN_NEOPIXEL
-  pixels.begin();
-  pixels.setBrightness(50);
-
-  #ifdef NEOPIXEL_POWER
-  pinMode(NEOPIXEL_POWER, OUTPUT);
-  digitalWrite(NEOPIXEL_POWER, NEOPIXEL_POWER_ON);
-  #endif
-#endif
-
   // overwrite input pin with PIN_BUTTONx
 #ifdef PIN_BUTTON1
   pins[0] = PIN_BUTTON1;
@@ -116,32 +88,21 @@ void setup()
 #endif
 
   // Set up pin as input
-  for (uint8_t i=0; i<pincount; i++)
-  {
+  for (uint8_t i = 0; i < pincount; i++) {
     pinMode(pins[i], activeState ? INPUT_PULLDOWN : INPUT_PULLUP);
   }
-
-  // wait until device mounted
-  while( !TinyUSBDevice.mounted() ) delay(1);
 }
 
-
-void loop()
-{
-  // poll gpio once each 2 ms
-  delay(2);
-
+void process_hid() {
   // used to avoid send multiple consecutive zero report for keyboard
   static bool keyPressedPreviously = false;
 
-  uint8_t count=0;
-  uint8_t keycode[6] = { 0 };
+  uint8_t count = 0;
+  uint8_t keycode[6] = {0};
 
   // scan normal key and send report
-  for(uint8_t i=0; i < pincount; i++)
-  {
-    if ( activeState == digitalRead(pins[i]) )
-    {
+  for (uint8_t i = 0; i < pincount; i++) {
+    if (activeState == digitalRead(pins[i])) {
       // if pin is active (low), add its hid code to key report
       keycode[count++] = hidcode[i];
 
@@ -150,45 +111,59 @@ void loop()
     }
   }
 
-  if ( TinyUSBDevice.suspended() && count )
-  {
+  if (TinyUSBDevice.suspended() && count) {
     // Wake up host if we are in suspend mode
     // and REMOTE_WAKEUP feature is enabled by host
     TinyUSBDevice.remoteWakeup();
   }
 
   // skip if hid is not ready e.g still transferring previous report
-  if ( !usb_hid.ready() ) return;
+  if (!usb_hid.ready()) return;
 
-  if ( count )
-  {
+  if (count) {
     // Send report if there is key pressed
     uint8_t const report_id = 0;
     uint8_t const modifier = 0;
 
     keyPressedPreviously = true;
     usb_hid.keyboardReport(report_id, modifier, keycode);
-  }else
-  {
+  } else {
     // Send All-zero report to indicate there is no keys pressed
     // Most of the time, it is, though we don't need to send zero report
     // every loop(), only a key is pressed in previous loop()
-    if ( keyPressedPreviously )
-    {
+    if (keyPressedPreviously) {
       keyPressedPreviously = false;
       usb_hid.keyboardRelease(0);
     }
   }
 }
 
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+
+  // not enumerated()/mounted() yet: nothing to do
+  if (!TinyUSBDevice.mounted()) {
+    return;
+  }
+
+  // poll gpio once each 2 ms
+  static uint32_t ms = 0;
+  if (millis() - ms > 2) {
+    ms = millis();
+    process_hid();
+  }
+}
+
 // Output report callback for LED indicator such as Caplocks
-void hid_report_callback(uint8_t report_id, hid_report_type_t report_type, uint8_t const* buffer, uint16_t bufsize)
-{
+void hid_report_callback(uint8_t report_id, hid_report_type_t report_type, uint8_t const* buffer, uint16_t bufsize) {
   (void) report_id;
   (void) bufsize;
 
   // LED indicator is output report with only 1 byte length
-  if ( report_type != HID_REPORT_TYPE_OUTPUT ) return;
+  if (report_type != HID_REPORT_TYPE_OUTPUT) return;
 
   // The LED bit map is as follows: (also defined by KEYBOARD_LED_* )
   // Kana (4) | Compose (3) | ScrollLock (2) | CapsLock (1) | Numlock (0)
@@ -196,9 +171,4 @@ void hid_report_callback(uint8_t report_id, hid_report_type_t report_type, uint8
 
   // turn on LED if capslock is set
   digitalWrite(LED_BUILTIN, ledIndicator & KEYBOARD_LED_CAPSLOCK);
-
-#ifdef PIN_NEOPIXEL
-  pixels.fill(ledIndicator & KEYBOARD_LED_CAPSLOCK ? 0xff0000 : 0x000000);
-  pixels.show();
-#endif
 }
diff --git a/examples/HID/hid_boot_mouse/hid_boot_mouse.ino b/examples/HID/hid_boot_mouse/hid_boot_mouse.ino
index 1715d768..39455822 100644
--- a/examples/HID/hid_boot_mouse/hid_boot_mouse.ino
+++ b/examples/HID/hid_boot_mouse/hid_boot_mouse.ino
@@ -19,43 +19,45 @@
  * and its active state (when pressed) are different
  */
 #if defined(ARDUINO_SAMD_CIRCUITPLAYGROUND_EXPRESS) || defined(ARDUINO_NRF52840_CIRCUITPLAY)
-  const int pin = 4; // Left Button
-  bool activeState = true;
+const int pin = 4; // Left Button
+bool activeState = true;
 
 #elif defined(ARDUINO_FUNHOUSE_ESP32S2)
-  const int pin = BUTTON_DOWN;
-  bool activeState = true;
+const int pin = BUTTON_DOWN;
+bool activeState = true;
 
 #elif defined PIN_BUTTON1
-  const int pin = PIN_BUTTON1;
-  bool activeState = false;
+const int pin = PIN_BUTTON1;
+bool activeState = false;
 
 #elif defined(ARDUINO_ARCH_ESP32)
-  const int pin = 0;
-  bool activeState = false;
+const int pin = 0;
+bool activeState = false;
 
+#elif defined(ARDUINO_ARCH_RP2040)
+const int pin = D0;
+bool activeState = false;
 #else
-  const int pin = 12;
-  bool activeState = false;
+const int pin = A0;
+bool activeState = false;
 #endif
 
 
 // HID report descriptor using TinyUSB's template
 // Single Report (no ID) descriptor
 uint8_t const desc_hid_report[] = {
-  TUD_HID_REPORT_DESC_MOUSE()
+    TUD_HID_REPORT_DESC_MOUSE()
 };
 
 // USB HID object
 Adafruit_USBD_HID usb_hid;
 
 // the setup function runs once when you press reset or power the board
-void setup()
-{
-#if defined(ARDUINO_ARCH_MBED) && defined(ARDUINO_ARCH_RP2040)
-  // Manual begin() is required on core without built-in support for TinyUSB such as mbed rp2040
-  TinyUSB_Device_Init(0);
-#endif
+void setup() {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
 
   // Set up button, pullup opposite to active state
   pinMode(pin, activeState ? INPUT_PULLDOWN : INPUT_PULLUP);
@@ -69,18 +71,10 @@ void setup()
   usb_hid.begin();
 
   Serial.begin(115200);
-
-  // wait until device mounted
-  while( !TinyUSBDevice.mounted() ) delay(1);
-
   Serial.println("Adafruit TinyUSB HID Mouse example");
 }
 
-void loop()
-{
-  // poll gpio once each 10 ms
-  delay(10);
-
+void process_hid() {
   // Whether button is pressed
   bool btn_pressed = (digitalRead(pin) == activeState);
 
@@ -88,17 +82,34 @@ void loop()
   if (!btn_pressed) return;
 
   // Remote wakeup
-  if ( TinyUSBDevice.suspended() )
-  {
+  if (TinyUSBDevice.suspended()) {
     // Wake up host if we are in suspend mode
     // and REMOTE_WAKEUP feature is enabled by host
     TinyUSBDevice.remoteWakeup();
   }
 
-  if ( usb_hid.ready() )
-  {
+  if (usb_hid.ready()) {
     uint8_t const report_id = 0; // no ID
     int8_t const delta = 5;
     usb_hid.mouseMove(report_id, delta, delta); // right + down
   }
 }
+
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+
+  // not enumerated()/mounted() yet: nothing to do
+  if (!TinyUSBDevice.mounted()) {
+    return;
+  }
+
+  // poll gpio once each 10 ms
+  static uint32_t ms = 0;
+  if (millis() - ms > 10) {
+    ms = millis();
+    process_hid();
+  }
+}
diff --git a/examples/HID/hid_composite/hid_composite.ino b/examples/HID/hid_composite/hid_composite.ino
index 3f179260..f2b9fdf4 100644
--- a/examples/HID/hid_composite/hid_composite.ino
+++ b/examples/HID/hid_composite/hid_composite.ino
@@ -20,30 +20,34 @@
  * and its active state (when pressed) are different
  */
 #if defined(ARDUINO_SAMD_CIRCUITPLAYGROUND_EXPRESS) || defined(ARDUINO_NRF52840_CIRCUITPLAY)
-  const int pin = 4; // Left Button
-  bool activeState = true;
+const int pin = 4; // Left Button
+bool activeState = true;
 
 #elif defined(ARDUINO_FUNHOUSE_ESP32S2)
-  const int pin = BUTTON_DOWN;
-  bool activeState = true;
+const int pin = BUTTON_DOWN;
+bool activeState = true;
 
 #elif defined PIN_BUTTON1
-  const int pin = PIN_BUTTON1;
-  bool activeState = false;
+const int pin = PIN_BUTTON1;
+bool activeState = false;
 
 #elif defined(ARDUINO_ARCH_ESP32)
-  const int pin = 0;
-  bool activeState = false;
+const int pin = 0;
+bool activeState = false;
+
+#elif defined(ARDUINO_ARCH_RP2040)
+const int pin = D0;
+bool activeState = false;
 
 #else
-  const int pin = 12;
-  bool activeState = false;
+const int pin = A0;
+bool activeState = false;
+
 #endif
 
 
 // Report ID
-enum
-{
+enum {
   RID_KEYBOARD = 1,
   RID_MOUSE,
   RID_CONSUMER_CONTROL, // Media, volume etc ..
@@ -51,17 +55,21 @@ enum
 
 // HID report descriptor using TinyUSB's template
 uint8_t const desc_hid_report[] = {
-  TUD_HID_REPORT_DESC_KEYBOARD( HID_REPORT_ID(RID_KEYBOARD) ),
-  TUD_HID_REPORT_DESC_MOUSE   ( HID_REPORT_ID(RID_MOUSE) ),
-  TUD_HID_REPORT_DESC_CONSUMER( HID_REPORT_ID(RID_CONSUMER_CONTROL) )
+    TUD_HID_REPORT_DESC_KEYBOARD(HID_REPORT_ID(RID_KEYBOARD)),
+    TUD_HID_REPORT_DESC_MOUSE   (HID_REPORT_ID(RID_MOUSE)),
+    TUD_HID_REPORT_DESC_CONSUMER(HID_REPORT_ID(RID_CONSUMER_CONTROL))
 };
 
 // USB HID object.
 Adafruit_USBD_HID usb_hid;
 
 // the setup function runs once when you press reset or power the board
-void setup()
-{
+void setup() {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
+
   // Set up HID
   usb_hid.setPollInterval(2);
   usb_hid.setReportDescriptor(desc_hid_report, sizeof(desc_hid_report));
@@ -73,32 +81,22 @@ void setup()
   pinMode(pin, activeState ? INPUT_PULLDOWN : INPUT_PULLUP);
 
   Serial.begin(115200);
-
-  // wait until device mounted
-  while( !TinyUSBDevice.mounted() ) delay(1);
-
   Serial.println("Adafruit TinyUSB HID Composite example");
 }
 
-void loop()
-{
-  // poll gpio once each 10 ms
-  delay(10);
-
+void process_hid() {
   // Whether button is pressed
   bool btn_pressed = (digitalRead(pin) == activeState);
 
   // Remote wakeup
-  if ( TinyUSBDevice.suspended() && btn_pressed )
-  {
+  if (TinyUSBDevice.suspended() && btn_pressed) {
     // Wake up host if we are in suspend mode
     // and REMOTE_WAKEUP feature is enabled by host
     TinyUSBDevice.remoteWakeup();
   }
 
   /*------------- Mouse -------------*/
-  if ( usb_hid.ready() && btn_pressed )
-  {
+  if (usb_hid.ready() && btn_pressed) {
     int8_t const delta = 5;
     usb_hid.mouseMove(RID_MOUSE, delta, delta); // right + down
 
@@ -107,21 +105,18 @@ void loop()
   }
 
   /*------------- Keyboard -------------*/
-  if ( usb_hid.ready() )
-  {
+  if (usb_hid.ready()) {
     // use to send key release report
     static bool has_key = false;
 
-    if ( btn_pressed )
-    {
-      uint8_t keycode[6] = { 0 };
+    if (btn_pressed) {
+      uint8_t keycode[6] = {0};
       keycode[0] = HID_KEY_A;
 
       usb_hid.keyboardReport(RID_KEYBOARD, 0, keycode);
 
       has_key = true;
-    }else
-    {
+    } else {
       // send empty key report if previously has key pressed
       if (has_key) usb_hid.keyboardRelease(RID_KEYBOARD);
       has_key = false;
@@ -132,8 +127,7 @@ void loop()
   }
 
   /*------------- Consumer Control -------------*/
-  if ( usb_hid.ready() )
-  {
+  if (usb_hid.ready()) {
     // Consumer Control is used to control Media playback, Volume, Brightness etc ...
     // Consumer report is 2-byte containing the control code of the key
     // For list of control check out https://github.com/hathach/tinyusb/blob/master/src/class/hid/hid.h
@@ -141,16 +135,33 @@ void loop()
     // use to send consumer release report
     static bool has_consumer_key = false;
 
-    if ( btn_pressed )
-    {
+    if (btn_pressed) {
       // send volume down (0x00EA)
       usb_hid.sendReport16(RID_CONSUMER_CONTROL, HID_USAGE_CONSUMER_VOLUME_DECREMENT);
       has_consumer_key = true;
-    }else
-    {
+    } else {
       // release the consume key by sending zero (0x0000)
       if (has_consumer_key) usb_hid.sendReport16(RID_CONSUMER_CONTROL, 0);
       has_consumer_key = false;
     }
   }
 }
+
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+
+  // not enumerated()/mounted() yet: nothing to do
+  if (!TinyUSBDevice.mounted()) {
+    return;
+  }
+
+  // poll gpio once each 10 ms
+  static uint32_t ms = 0;
+  if (millis() - ms > 10) {
+    ms = millis();
+    process_hid();
+  }
+}
diff --git a/examples/HID/hid_composite_joy_featherwing/hid_composite_joy_featherwing.ino b/examples/HID/hid_composite_joy_featherwing/hid_composite_joy_featherwing.ino
index 01f4481d..11bcf414 100644
--- a/examples/HID/hid_composite_joy_featherwing/hid_composite_joy_featherwing.ino
+++ b/examples/HID/hid_composite_joy_featherwing/hid_composite_joy_featherwing.ino
@@ -33,17 +33,15 @@ uint32_t button_mask = (1 << BUTTON_A) | (1 << BUTTON_B) |
 Adafruit_seesaw ss;
 
 // Report ID
-enum
-{
+enum {
   RID_KEYBOARD = 1,
   RID_MOUSE
 };
 
 // HID report descriptor using TinyUSB's template
-uint8_t const desc_hid_report[] =
-{
-  TUD_HID_REPORT_DESC_KEYBOARD( HID_REPORT_ID(RID_KEYBOARD) ),
-  TUD_HID_REPORT_DESC_MOUSE   ( HID_REPORT_ID(RID_MOUSE) )
+uint8_t const desc_hid_report[] = {
+    TUD_HID_REPORT_DESC_KEYBOARD(HID_REPORT_ID(RID_KEYBOARD)),
+    TUD_HID_REPORT_DESC_MOUSE   (HID_REPORT_ID(RID_MOUSE))
 };
 
 // USB HID object. For ESP32 these values cannot be changed after this declaration
@@ -53,20 +51,23 @@ Adafruit_USBD_HID usb_hid(desc_hid_report, sizeof(desc_hid_report), HID_ITF_PROT
 int last_x, last_y;
 
 // the setup function runs once when you press reset or power the board
-void setup()
-{
+void setup() {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
+
   // Notes: following commented-out functions has no affect on ESP32
   // usb_hid.setPollInterval(2);
   // usb_hid.setReportDescriptor(desc_hid_report, sizeof(desc_hid_report));
-
   usb_hid.begin();
 
   Serial.begin(115200);
   Serial.println("Adafruit TinyUSB HID Mouse with Joy FeatherWing example");
 
-  if(!ss.begin(0x49)){
+  if (!ss.begin(0x49)) {
     Serial.println("ERROR! seesaw not found");
-    while(1);
+    while (1) {}
   } else {
     Serial.println("seesaw started");
     Serial.print("version: ");
@@ -77,16 +78,9 @@ void setup()
 
   last_y = ss.analogRead(2);
   last_x = ss.analogRead(3);
-
-  // wait until device mounted
-  while( !TinyUSBDevice.mounted() ) delay(1);
 }
 
-void loop()
-{
-  // poll gpio once each 10 ms
-  delay(10);
-
+void process_hid() {
   // If either analog stick or any buttons is pressed
   bool has_action = false;
 
@@ -98,12 +92,10 @@ void loop()
   int dx = (x - last_x) / 2;
   int dy = (y - last_y) / 2;
 
-  if ( (abs(dx) > 3) || (abs(dy) > 3) )
-  {
+  if ((abs(dx) > 3) || (abs(dy) > 3)) {
     has_action = true;
 
-    if ( usb_hid.ready() )
-    {
+    if (usb_hid.ready()) {
       usb_hid.mouseMove(RID_MOUSE, dx, dy); // no ID: right + down
 
       last_x = x;
@@ -114,31 +106,27 @@ void loop()
     }
   }
 
-
   /*------------- Keyboard -------------*/
   // button is active low, invert read value for convenience
   uint32_t buttons = ~ss.digitalReadBulk(button_mask);
 
-  if ( usb_hid.ready() )
-  {
+  if (usb_hid.ready()) {
     // use to prevent sending multiple consecutive zero report
     static bool has_key = false;
 
-    if ( buttons & button_mask )
-    {
+    if (buttons & button_mask) {
       has_action = true;
       has_key = true;
 
-      uint8_t keycode[6] = { 0 };
-      
-      if ( buttons & (1 << BUTTON_A) ) keycode[0] = HID_KEY_A;
-      if ( buttons & (1 << BUTTON_B) ) keycode[0] = HID_KEY_B;
-      if ( buttons & (1 << BUTTON_X) ) keycode[0] = HID_KEY_X;
-      if ( buttons & (1 << BUTTON_Y) ) keycode[0] = HID_KEY_Y;
+      uint8_t keycode[6] = {0};
+
+      if (buttons & (1 << BUTTON_A)) keycode[0] = HID_KEY_A;
+      if (buttons & (1 << BUTTON_B)) keycode[0] = HID_KEY_B;
+      if (buttons & (1 << BUTTON_X)) keycode[0] = HID_KEY_X;
+      if (buttons & (1 << BUTTON_Y)) keycode[0] = HID_KEY_Y;
 
       usb_hid.keyboardReport(RID_KEYBOARD, 0, keycode);
-    }else
-    {
+    } else {
       // send empty key report if previously has key pressed
       if (has_key) usb_hid.keyboardRelease(RID_KEYBOARD);
       has_key = false;
@@ -147,10 +135,28 @@ void loop()
 
   /*------------- Remote Wakeup -------------*/
   // Remote wakeup if PC is suspended and we has user interaction with joy feather wing
-  if ( has_action && TinyUSBDevice.suspended() )
-  {
+  if (has_action && TinyUSBDevice.suspended()) {
     // Wake up only works if REMOTE_WAKEUP feature is enable by host
     // Usually this is the case with Mouse/Keyboard device
     TinyUSBDevice.remoteWakeup();
   }
 }
+
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+
+  // not enumerated()/mounted() yet: nothing to do
+  if (!TinyUSBDevice.mounted()) {
+    return;
+  }
+
+  // poll gpio once each 10 ms
+  static uint32_t ms = 0;
+  if (millis() - ms > 10) {
+    ms = millis();
+    process_hid();
+  }
+}
diff --git a/examples/HID/hid_dual_interfaces/hid_dual_interfaces.ino b/examples/HID/hid_dual_interfaces/hid_dual_interfaces.ino
index 43f5445b..7a863c06 100644
--- a/examples/HID/hid_dual_interfaces/hid_dual_interfaces.ino
+++ b/examples/HID/hid_dual_interfaces/hid_dual_interfaces.ino
@@ -19,37 +19,41 @@
  * and its active state (when pressed) are different
  */
 #if defined(ARDUINO_SAMD_CIRCUITPLAYGROUND_EXPRESS) || defined(ARDUINO_NRF52840_CIRCUITPLAY)
-  const int pin = 4; // Left Button
-  bool activeState = true;
+const int pin = 4; // Left Button
+bool activeState = true;
 
 #elif defined(ARDUINO_FUNHOUSE_ESP32S2)
-  const int pin = BUTTON_DOWN;
-  bool activeState = true;
+const int pin = BUTTON_DOWN;
+bool activeState = true;
 
 #elif defined PIN_BUTTON1
-  const int pin = PIN_BUTTON1;
-  bool activeState = false;
+const int pin = PIN_BUTTON1;
+bool activeState = false;
 
 #elif defined PIN_BUTTON
-  const int pin = PIN_BUTTON;
-  bool activeState = false;
+const int pin = PIN_BUTTON;
+bool activeState = false;
 
 #elif defined(ARDUINO_ARCH_ESP32)
-  const int pin = 0;
-  bool activeState = false;
+const int pin = 0;
+bool activeState = false;
 
+#elif defined(ARDUINO_ARCH_RP2040)
+const int pin = D0;
+bool activeState = false;
 #else
-  const int pin = 12;
-  bool activeState = false;
+
+const int pin = A0;
+bool activeState = false;
 #endif
 
 // HID report descriptor using TinyUSB's template
 uint8_t const desc_keyboard_report[] = {
-  TUD_HID_REPORT_DESC_KEYBOARD()
+    TUD_HID_REPORT_DESC_KEYBOARD()
 };
 
 uint8_t const desc_mouse_report[] = {
-  TUD_HID_REPORT_DESC_MOUSE()
+    TUD_HID_REPORT_DESC_MOUSE()
 };
 
 // USB HID objects
@@ -57,8 +61,12 @@ Adafruit_USBD_HID usb_keyboard;
 Adafruit_USBD_HID usb_mouse;
 
 // the setup function runs once when you press reset or power the board
-void setup()
-{
+void setup() {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
+
   // HID Keyboard
   usb_keyboard.setPollInterval(2);
   usb_keyboard.setBootProtocol(HID_ITF_PROTOCOL_KEYBOARD);
@@ -77,54 +85,61 @@ void setup()
   pinMode(pin, activeState ? INPUT_PULLDOWN : INPUT_PULLUP);
 
   Serial.begin(115200);
-
-  // wait until device mounted
-  //while( !TinyUSBDevice.mounted() ) delay(1);
   Serial.println("Adafruit TinyUSB HID Composite example");
 }
 
-void loop()
-{
-  // poll gpio once each 10 ms
-  delay(10);
-
+void process_hid() {
   // Whether button is pressed
   bool btn_pressed = (digitalRead(pin) == activeState);
 
   // Remote wakeup
-  if ( TinyUSBDevice.suspended() && btn_pressed )
-  {
+  if (TinyUSBDevice.suspended() && btn_pressed) {
     // Wake up host if we are in suspend mode
     // and REMOTE_WAKEUP feature is enabled by host
     TinyUSBDevice.remoteWakeup();
   }
 
   /*------------- Mouse -------------*/
-  if (usb_mouse.ready() && btn_pressed )
-  {
+  if (usb_mouse.ready() && btn_pressed) {
     int8_t const delta = 5;
     usb_mouse.mouseMove(0, delta, delta); // right + down
   }
 
   /*------------- Keyboard -------------*/
-  if ( usb_keyboard.ready() )
-  {
+  if (usb_keyboard.ready()) {
     // use to send key release report
     static bool has_key = false;
 
-    if ( btn_pressed )
-    {
-      uint8_t keycode[6] = { 0 };
+    if (btn_pressed) {
+      uint8_t keycode[6] = {0};
       keycode[0] = HID_KEY_A;
 
       usb_keyboard.keyboardReport(0, 0, keycode);
 
       has_key = true;
-    }else
-    {
+    } else {
       // send empty key report if previously has key pressed
       if (has_key) usb_keyboard.keyboardRelease(0);
       has_key = false;
     }
   }
+}
+
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+
+  // not enumerated()/mounted() yet: nothing to do
+  if (!TinyUSBDevice.mounted()) {
+    return;
+  }
+
+  // poll gpio once each 10 ms
+  static uint32_t ms = 0;
+  if (millis() - ms > 10) {
+    ms = millis();
+    process_hid();
+  }
 }
\ No newline at end of file
diff --git a/examples/HID/hid_gamepad/hid_gamepad.ino b/examples/HID/hid_gamepad/hid_gamepad.ino
index 84b3289c..79fc8f07 100644
--- a/examples/HID/hid_gamepad/hid_gamepad.ino
+++ b/examples/HID/hid_gamepad/hid_gamepad.ino
@@ -23,7 +23,7 @@
 // HID report descriptor using TinyUSB's template
 // Single Report (no ID) descriptor
 uint8_t const desc_hid_report[] = {
-  TUD_HID_REPORT_DESC_GAMEPAD()
+    TUD_HID_REPORT_DESC_GAMEPAD()
 };
 
 // USB HID object
@@ -32,31 +32,35 @@ Adafruit_USBD_HID usb_hid;
 // Report payload defined in src/class/hid/hid.h
 // - For Gamepad Button Bit Mask see  hid_gamepad_button_bm_t
 // - For Gamepad Hat    Bit Mask see  hid_gamepad_hat_t
-hid_gamepad_report_t    gp;
+hid_gamepad_report_t gp;
 
-void setup() 
-{
-#if defined(ARDUINO_ARCH_MBED) && defined(ARDUINO_ARCH_RP2040)
-  // Manual begin() is required on core without built-in support for TinyUSB such as mbed rp2040
-  TinyUSB_Device_Init(0);
-#endif
+void setup() {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
 
   Serial.begin(115200);
-  
+
   // Setup HID
   usb_hid.setPollInterval(2);
   usb_hid.setReportDescriptor(desc_hid_report, sizeof(desc_hid_report));
-
   usb_hid.begin();
 
-  // wait until device mounted
-  while( !TinyUSBDevice.mounted() ) delay(1);
-  
   Serial.println("Adafruit TinyUSB HID Gamepad example");
 }
 
-void loop() 
-{ 
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+
+  // not enumerated()/mounted() yet: nothing to do
+  if (!TinyUSBDevice.mounted()) {
+    return;
+  }
+
 //  // Remote wakeup
 //  if ( TinyUSBDevice.suspended() && btn )
 //  {
@@ -65,22 +69,22 @@ void loop()
 //    TinyUSBDevice.remoteWakeup();
 //  }
 
-  if ( !usb_hid.ready() ) return;
+  if (!usb_hid.ready()) return;
 
   // Reset buttons
   Serial.println("No pressing buttons");
-  gp.x       = 0;
-  gp.y       = 0;
-  gp.z       = 0;
-  gp.rz      = 0;
-  gp.rx      = 0;
-  gp.ry      = 0;
-  gp.hat     = 0;
+  gp.x = 0;
+  gp.y = 0;
+  gp.z = 0;
+  gp.rz = 0;
+  gp.rx = 0;
+  gp.ry = 0;
+  gp.hat = 0;
   gp.buttons = 0;
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
 
-  
+
   // Hat/DPAD UP
   Serial.println("Hat/DPAD UP");
   gp.hat = 1; // GAMEPAD_HAT_UP;
@@ -105,12 +109,12 @@ void loop()
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
 
-   // Hat/DPAD DOWN
+  // Hat/DPAD DOWN
   Serial.println("Hat/DPAD DOWN");
   gp.hat = 5; // GAMEPAD_HAT_DOWN;
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
-  
+
   // Hat/DPAD DOWN LEFT
   Serial.println("Hat/DPAD DOWN LEFT");
   gp.hat = 6; // GAMEPAD_HAT_DOWN_LEFT;
@@ -135,14 +139,14 @@ void loop()
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
 
-  
+
   // Joystick 1 UP
   Serial.println("Joystick 1 UP");
   gp.x = 0;
   gp.y = -127;
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
-  
+
   // Joystick 1 DOWN
   Serial.println("Joystick 1 DOWN");
   gp.x = 0;
@@ -156,7 +160,7 @@ void loop()
   gp.y = 0;
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
-  
+
   // Joystick 1 LEFT
   Serial.println("Joystick 1 LEFT");
   gp.x = -127;
@@ -174,35 +178,35 @@ void loop()
 
   // Joystick 2 UP
   Serial.println("Joystick 2 UP");
-  gp.z  = 0;
+  gp.z = 0;
   gp.rz = 127;
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
-  
+
   // Joystick 2 DOWN
   Serial.println("Joystick 2 DOWN");
-  gp.z  = 0;
+  gp.z = 0;
   gp.rz = -127;
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
 
   // Joystick 2 RIGHT
   Serial.println("Joystick 2 RIGHT");
-  gp.z  = 127;
+  gp.z = 127;
   gp.rz = 0;
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
-  
+
   // Joystick 2 LEFT
   Serial.println("Joystick 2 LEFT");
-  gp.z  = -127;
+  gp.z = -127;
   gp.rz = 0;
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
 
   // Joystick 2 CENTER
   Serial.println("Joystick 2 CENTER");
-  gp.z  = 0;
+  gp.z = 0;
   gp.rz = 0;
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
@@ -213,7 +217,7 @@ void loop()
   gp.rx = 127;
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
-  
+
   // Analog Trigger 1 DOWN
   Serial.println("Analog Trigger 1 DOWN");
   gp.rx = -127;
@@ -232,7 +236,7 @@ void loop()
   gp.ry = 127;
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
-  
+
   // Analog Trigger 2 DOWN
   Serial.println("Analog Trigger 2 DOWN");
   gp.ry = -127;
@@ -245,11 +249,11 @@ void loop()
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
 
-  
+
   // Test buttons (up to 32 buttons)
-  for (int i=0; i<32; ++i)
-  {
-    Serial.print("Pressing button "); Serial.println(i);
+  for (int i = 0; i < 32; ++i) {
+    Serial.print("Pressing button ");
+    Serial.println(i);
     gp.buttons = (1U << i);
     usb_hid.sendReport(0, &gp, sizeof(gp));
     delay(1000);
@@ -258,13 +262,13 @@ void loop()
 
   // Random touch
   Serial.println("Random touch");
-  gp.x       = random(-127, 128);
-  gp.y       = random(-127, 128);
-  gp.z       = random(-127, 128);
-  gp.rz      = random(-127, 128);
-  gp.rx      = random(-127, 128);
-  gp.ry      = random(-127, 128);
-  gp.hat     = random(0,      9);
+  gp.x = random(-127, 128);
+  gp.y = random(-127, 128);
+  gp.z = random(-127, 128);
+  gp.rz = random(-127, 128);
+  gp.rx = random(-127, 128);
+  gp.ry = random(-127, 128);
+  gp.hat = random(0, 9);
   gp.buttons = random(0, 0xffff);
   usb_hid.sendReport(0, &gp, sizeof(gp));
   delay(2000);
diff --git a/examples/HID/hid_generic_inout/hid_generic_inout.ino b/examples/HID/hid_generic_inout/hid_generic_inout.ino
index b543dd78..ab4974ef 100644
--- a/examples/HID/hid_generic_inout/hid_generic_inout.ino
+++ b/examples/HID/hid_generic_inout/hid_generic_inout.ino
@@ -40,19 +40,18 @@
 // HID report descriptor using TinyUSB's template
 // Generic In Out with 64 bytes report (max)
 uint8_t const desc_hid_report[] = {
-  TUD_HID_REPORT_DESC_GENERIC_INOUT(64)
+    TUD_HID_REPORT_DESC_GENERIC_INOUT(64)
 };
 
 // USB HID object
 Adafruit_USBD_HID usb_hid;
 
 // the setup function runs once when you press reset or power the board
-void setup()
-{
-#if defined(ARDUINO_ARCH_MBED) && defined(ARDUINO_ARCH_RP2040)
-  // Manual begin() is required on core without built-in support for TinyUSB such as mbed rp2040
-  TinyUSB_Device_Init(0);
-#endif
+void setup() {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
 
   // Notes: following commented-out functions has no affect on ESP32
   usb_hid.enableOutEndpoint(true);
@@ -64,23 +63,20 @@ void setup()
   usb_hid.begin();
 
   Serial.begin(115200);
-
-  // wait until device mounted
-  while( !TinyUSBDevice.mounted() ) delay(1);
-
   Serial.println("Adafruit TinyUSB HID Generic In Out example");
 }
 
-void loop()
-{
-  // nothing to do
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
 }
 
 // Invoked when received GET_REPORT control request
 // Application must fill buffer report's content and return its length.
 // Return zero will cause the stack to STALL request
-uint16_t get_report_callback (uint8_t report_id, hid_report_type_t report_type, uint8_t* buffer, uint16_t reqlen)
-{
+uint16_t get_report_callback(uint8_t report_id, hid_report_type_t report_type, uint8_t* buffer, uint16_t reqlen) {
   // not used in this example
   (void) report_id;
   (void) report_type;
@@ -91,8 +87,7 @@ uint16_t get_report_callback (uint8_t report_id, hid_report_type_t report_type,
 
 // Invoked when received SET_REPORT control request or
 // received data on OUT endpoint ( Report ID = 0, Type = 0 )
-void set_report_callback(uint8_t report_id, hid_report_type_t report_type, uint8_t const* buffer, uint16_t bufsize)
-{
+void set_report_callback(uint8_t report_id, hid_report_type_t report_type, uint8_t const* buffer, uint16_t bufsize) {
   // This example doesn't use multiple report and report ID
   (void) report_id;
   (void) report_type;
diff --git a/examples/MIDI/midi_multi_ports/midi_multi_ports.ino b/examples/MIDI/midi_multi_ports/midi_multi_ports.ino
index 8d39c06c..c7edd8ee 100644
--- a/examples/MIDI/midi_multi_ports/midi_multi_ports.ino
+++ b/examples/MIDI/midi_multi_ports/midi_multi_ports.ino
@@ -23,10 +23,10 @@ void setup()
 {
   pinMode(LED_BUILTIN, OUTPUT);
 
-#if defined(ARDUINO_ARCH_MBED) && defined(ARDUINO_ARCH_RP2040)
-  // Manual begin() is required on core without built-in support for TinyUSB such as mbed rp2040
-  TinyUSB_Device_Init(0);
-#endif
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
 
   // Set name for each cable, must be done before usb_midi.begin()
   usb_midi.setCableName(1, "Keyboard");
@@ -38,9 +38,16 @@ void setup()
 
 void loop()
 {
-  digitalWrite(LED_BUILTIN, HIGH);
-  delay(1000);
-
-  digitalWrite(LED_BUILTIN, LOW);
-  delay(1000);
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+
+  // toggle LED
+  static uint32_t ms = 0;
+  static uint8_t led_state = 0;
+  if (millis() - ms > 1000) {
+    ms = millis();
+    digitalWrite(LED_BUILTIN, 1-led_state);
+  }
 }
diff --git a/examples/MIDI/midi_test/midi_test.ino b/examples/MIDI/midi_test/midi_test.ino
index ce41970b..22cd124c 100644
--- a/examples/MIDI/midi_test/midi_test.ino
+++ b/examples/MIDI/midi_test/midi_test.ino
@@ -31,20 +31,19 @@ uint32_t position = 0;
 
 // Store example melody as an array of note values
 byte note_sequence[] = {
-  74,78,81,86,90,93,98,102,57,61,66,69,73,78,81,85,88,92,97,100,97,92,88,85,81,78,
-  74,69,66,62,57,62,66,69,74,78,81,86,90,93,97,102,97,93,90,85,81,78,73,68,64,61,
-  56,61,64,68,74,78,81,86,90,93,98,102
+    74, 78, 81, 86, 90, 93, 98, 102, 57, 61, 66, 69, 73, 78, 81, 85, 88, 92, 97, 100, 97, 92, 88, 85, 81, 78,
+    74, 69, 66, 62, 57, 62, 66, 69, 74, 78, 81, 86, 90, 93, 97, 102, 97, 93, 90, 85, 81, 78, 73, 68, 64, 61,
+    56, 61, 64, 68, 74, 78, 81, 86, 90, 93, 98, 102
 };
 
-void setup()
-{
-#if defined(ARDUINO_ARCH_MBED) && defined(ARDUINO_ARCH_RP2040)
-  // Manual begin() is required on core without built-in support for TinyUSB such as mbed rp2040
-  TinyUSB_Device_Init(0);
-#endif
+void setup() {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
 
   pinMode(LED_BUILTIN, OUTPUT);
-  
+
   usb_midi.setStringDescriptor("TinyUSB MIDI");
 
   // Initialize MIDI, and listen to all MIDI channels
@@ -59,37 +58,42 @@ void setup()
   MIDI.setHandleNoteOff(handleNoteOff);
 
   Serial.begin(115200);
-
-  // wait until device mounted
-  while( !TinyUSBDevice.mounted() ) delay(1);
 }
 
-void loop()
-{
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+
+  // not enumerated()/mounted() yet: nothing to do
+  if (!TinyUSBDevice.mounted()) {
+    return;
+  }
+
   static uint32_t start_ms = 0;
-  if ( millis() - start_ms > 266 )
-  {
+  if (millis() - start_ms > 266) {
     start_ms += 266;
-    
+
     // Setup variables for the current and previous
     // positions in the note sequence.
     int previous = position - 1;
-  
+
     // If we currently are at position 0, set the
     // previous position to the last note in the sequence.
     if (previous < 0) {
       previous = sizeof(note_sequence) - 1;
     }
-  
+
     // Send Note On for current position at full velocity (127) on channel 1.
     MIDI.sendNoteOn(note_sequence[position], 127, 1);
-  
+
     // Send Note Off for previous note.
     MIDI.sendNoteOff(note_sequence[previous], 0, 1);
-  
+
     // Increment position
     position++;
-  
+
     // If we are at the end of the sequence, start over.
     if (position >= sizeof(note_sequence)) {
       position = 0;
@@ -97,11 +101,10 @@ void loop()
   }
 
   // read any new MIDI messages
-  MIDI.read();  
+  MIDI.read();
 }
 
-void handleNoteOn(byte channel, byte pitch, byte velocity)
-{
+void handleNoteOn(byte channel, byte pitch, byte velocity) {
   // Log when a note is pressed.
   Serial.print("Note on: channel = ");
   Serial.print(channel);
@@ -113,8 +116,7 @@ void handleNoteOn(byte channel, byte pitch, byte velocity)
   Serial.println(velocity);
 }
 
-void handleNoteOff(byte channel, byte pitch, byte velocity)
-{
+void handleNoteOff(byte channel, byte pitch, byte velocity) {
   // Log when a note is released.
   Serial.print("Note off: channel = ");
   Serial.print(channel);
diff --git a/examples/MassStorage/msc_ramdisk_dual/msc_ramdisk_dual.ino b/examples/MassStorage/msc_ramdisk_dual/msc_ramdisk_dual.ino
index 302fb7e4..27322cba 100644
--- a/examples/MassStorage/msc_ramdisk_dual/msc_ramdisk_dual.ino
+++ b/examples/MassStorage/msc_ramdisk_dual/msc_ramdisk_dual.ino
@@ -14,20 +14,20 @@
 // 8KB is the smallest size that windows allow to mount
 #define DISK_BLOCK_NUM  16
 #define DISK_BLOCK_SIZE 512
+
 #include "ramdisk.h"
 
 Adafruit_USBD_MSC usb_msc;
 
 // the setup function runs once when you press reset or power the board
-void setup()
-{
-#if defined(ARDUINO_ARCH_MBED) && defined(ARDUINO_ARCH_RP2040)
-  // Manual begin() is required on core without built-in support for TinyUSB such as mbed rp2040
-  TinyUSB_Device_Init(0);
-#endif
+void setup() {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
 
   usb_msc.setMaxLun(2);
-  
+
   // Set disk size and callback for Logical Unit 0 (LUN 0)
   usb_msc.setID(0, "Adafruit", "Lun0", "1.0");
   usb_msc.setCapacity(0, DISK_BLOCK_NUM, DISK_BLOCK_SIZE);
@@ -39,7 +39,7 @@ void setup()
   usb_msc.setCapacity(1, DISK_BLOCK_NUM, DISK_BLOCK_SIZE);
   usb_msc.setReadWriteCallback(1, ram1_read_cb, ram1_write_cb, ram1_flush_cb);
   usb_msc.setUnitReady(1, true);
-    
+
   usb_msc.begin();
 
   Serial.begin(115200);
@@ -48,9 +48,11 @@ void setup()
   Serial.println("Adafruit TinyUSB Mass Storage Dual RAM Disks example");
 }
 
-void loop()
-{
-  // nothing to do
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
 }
 
 
@@ -61,8 +63,7 @@ void loop()
 // Callback invoked when received READ10 command.
 // Copy disk's data to buffer (up to bufsize) and 
 // return number of copied bytes (must be multiple of block size) 
-int32_t ram0_read_cb (uint32_t lba, void* buffer, uint32_t bufsize)
-{
+int32_t ram0_read_cb(uint32_t lba, void* buffer, uint32_t bufsize) {
   uint8_t const* addr = msc_disk0[lba];
   memcpy(buffer, addr, bufsize);
 
@@ -72,8 +73,7 @@ int32_t ram0_read_cb (uint32_t lba, void* buffer, uint32_t bufsize)
 // Callback invoked when received WRITE10 command.
 // Process data in buffer to disk's storage and 
 // return number of written bytes (must be multiple of block size)
-int32_t ram0_write_cb (uint32_t lba, uint8_t* buffer, uint32_t bufsize)
-{
+int32_t ram0_write_cb(uint32_t lba, uint8_t* buffer, uint32_t bufsize) {
   uint8_t* addr = msc_disk0[lba];
   memcpy(addr, buffer, bufsize);
 
@@ -82,8 +82,7 @@ int32_t ram0_write_cb (uint32_t lba, uint8_t* buffer, uint32_t bufsize)
 
 // Callback invoked when WRITE10 command is completed (status received and accepted by host).
 // used to flush any pending cache.
-void ram0_flush_cb (void)
-{
+void ram0_flush_cb(void) {
   // nothing to do
 }
 
@@ -95,8 +94,7 @@ void ram0_flush_cb (void)
 // Callback invoked when received READ10 command.
 // Copy disk's data to buffer (up to bufsize) and 
 // return number of copied bytes (must be multiple of block size) 
-int32_t ram1_read_cb (uint32_t lba, void* buffer, uint32_t bufsize)
-{
+int32_t ram1_read_cb(uint32_t lba, void* buffer, uint32_t bufsize) {
   uint8_t const* addr = msc_disk1[lba];
   memcpy(buffer, addr, bufsize);
 
@@ -106,8 +104,7 @@ int32_t ram1_read_cb (uint32_t lba, void* buffer, uint32_t bufsize)
 // Callback invoked when received WRITE10 command.
 // Process data in buffer to disk's storage and 
 // return number of written bytes (must be multiple of block size)
-int32_t ram1_write_cb (uint32_t lba, uint8_t* buffer, uint32_t bufsize)
-{
+int32_t ram1_write_cb(uint32_t lba, uint8_t* buffer, uint32_t bufsize) {
   uint8_t* addr = msc_disk1[lba];
   memcpy(addr, buffer, bufsize);
 
@@ -116,7 +113,6 @@ int32_t ram1_write_cb (uint32_t lba, uint8_t* buffer, uint32_t bufsize)
 
 // Callback invoked when WRITE10 command is completed (status received and accepted by host).
 // used to flush any pending cache.
-void ram1_flush_cb (void)
-{
+void ram1_flush_cb(void) {
   // nothing to do
 }
diff --git a/examples/Video/video_capture/video_capture.ino b/examples/Video/video_capture/video_capture.ino
index 353489b1..6cf47587 100644
--- a/examples/Video/video_capture/video_capture.ino
+++ b/examples/Video/video_capture/video_capture.ino
@@ -120,6 +120,11 @@ static unsigned already_sent = 0;
 static void fill_color_bar(uint8_t* buffer, unsigned start_position);
 
 void setup() {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
+
   Serial.begin(115200);
 
   usb_video.addTerminal(&desc_camera_terminal);
@@ -132,6 +137,11 @@ void setup() {
 }
 
 void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+
   if (!tud_video_n_streaming(0, 0)) {
     already_sent = 0;
     frame_num = 0;
diff --git a/examples/WebUSB/webusb_rgb/webusb_rgb.ino b/examples/WebUSB/webusb_rgb/webusb_rgb.ino
index 72bc32bb..f1849801 100644
--- a/examples/WebUSB/webusb_rgb/webusb_rgb.ino
+++ b/examples/WebUSB/webusb_rgb/webusb_rgb.ino
@@ -54,12 +54,11 @@ Adafruit_USBD_WebUSB usb_web;
 WEBUSB_URL_DEF(landingPage, 1 /*https*/, "example.tinyusb.org/webusb-rgb/index.html");
 
 // the setup function runs once when you press reset or power the board
-void setup()
-{
-#if defined(ARDUINO_ARCH_MBED) && defined(ARDUINO_ARCH_RP2040)
-  // Manual begin() is required on core without built-in support for TinyUSB such as mbed rp2040
-  TinyUSB_Device_Init(0);
-#endif
+void setup() {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
   //usb_web.setStringDescriptor("TinyUSB WebUSB");
   usb_web.setLandingPage(&landingPage);
   usb_web.setLineStateCallback(line_state_callback);
@@ -79,21 +78,24 @@ void setup()
   pixels.show();
 
   // wait until device mounted
-  while( !TinyUSBDevice.mounted() ) delay(1);
+  while (!TinyUSBDevice.mounted()) delay(1);
 
   Serial.println("TinyUSB WebUSB RGB example");
 }
 
 // convert a hex character to number
-uint8_t char2num(char c)
-{
+uint8_t char2num(char c) {
   if (c >= 'a') return c - 'a' + 10;
   if (c >= 'A') return c - 'A' + 10;
-  return c - '0';  
+  return c - '0';
 }
 
-void loop()
-{
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+
   // Landing Page 7 characters as hex color '#RRGGBB'
   if (usb_web.available() < 7) return;
 
@@ -104,17 +106,16 @@ void loop()
   Serial.write(input, 7);
   Serial.println();
 
-  uint8_t red   = 16*char2num(input[1]) + char2num(input[2]);
-  uint8_t green = 16*char2num(input[3]) + char2num(input[4]);
-  uint8_t blue  = 16*char2num(input[5]) + char2num(input[6]);
+  uint8_t red = 16 * char2num(input[1]) + char2num(input[2]);
+  uint8_t green = 16 * char2num(input[3]) + char2num(input[4]);
+  uint8_t blue = 16 * char2num(input[5]) + char2num(input[6]);
 
   uint32_t color = (red << 16) | (green << 8) | blue;
   pixels.fill(color);
   pixels.show();
 }
 
-void line_state_callback(bool connected)
-{
+void line_state_callback(bool connected) {
   // connected = green, disconnected = red
   pixels.fill(connected ? 0x00ff00 : 0xff0000);
   pixels.show();
diff --git a/examples/WebUSB/webusb_serial/webusb_serial.ino b/examples/WebUSB/webusb_serial/webusb_serial.ino
index 6dd52d28..90cb9ee7 100644
--- a/examples/WebUSB/webusb_serial/webusb_serial.ino
+++ b/examples/WebUSB/webusb_serial/webusb_serial.ino
@@ -37,16 +37,15 @@ WEBUSB_URL_DEF(landingPage, 1 /*https*/, "example.tinyusb.org/webusb-serial/inde
 int led_pin = LED_BUILTIN;
 
 // the setup function runs once when you press reset or power the board
-void setup()
-{
-#if defined(ARDUINO_ARCH_MBED) && defined(ARDUINO_ARCH_RP2040)
-  // Manual begin() is required on core without built-in support for TinyUSB such as mbed rp2040
-  TinyUSB_Device_Init(0);
-#endif
+void setup() {
+  // Manual begin() is required on core without built-in support e.g. mbed rp2040
+  if (!TinyUSBDevice.isInitialized()) {
+    TinyUSBDevice.begin(0);
+  }
 
   pinMode(led_pin, OUTPUT);
   digitalWrite(led_pin, LOW);
-  
+
   usb_web.setLandingPage(&landingPage);
   usb_web.setLineStateCallback(line_state_callback);
   //usb_web.setStringDescriptor("TinyUSB WebUSB");
@@ -55,57 +54,53 @@ void setup()
   Serial.begin(115200);
 
   // wait until device mounted
-  while( !TinyUSBDevice.mounted() ) delay(1);
+  while (!TinyUSBDevice.mounted()) delay(1);
 
   Serial.println("TinyUSB WebUSB Serial example");
 }
 
 // function to echo to both Serial and WebUSB
-void echo_all(uint8_t buf[], uint32_t count)
-{
-  if (usb_web.connected())
-  {
+void echo_all(uint8_t buf[], uint32_t count) {
+  if (usb_web.connected()) {
     usb_web.write(buf, count);
     usb_web.flush();
   }
 
-  if ( Serial )
-  {
-    for(uint32_t i=0; i<count; i++)
-    {
+  if (Serial) {
+    for (uint32_t i = 0; i < count; i++) {
       Serial.write(buf[i]);
-      if ( buf[i] == '\r' ) Serial.write('\n');
+      if (buf[i] == '\r') Serial.write('\n');
     }
     Serial.flush();
   }
 }
 
-void loop()
-{
+void loop() {
+  #ifdef TINYUSB_NEED_POLLING_TASK
+  // Manual call tud_task since it isn't called by Core's background
+  TinyUSBDevice.task();
+  #endif
+
   uint8_t buf[64];
   uint32_t count;
 
   // From Serial to both Serial & webUSB
-  if (Serial.available())
-  {
+  if (Serial.available()) {
     count = Serial.read(buf, 64);
     echo_all(buf, count);
   }
 
   // from WebUSB to both Serial & webUSB
-  if (usb_web.available())
-  {
+  if (usb_web.available()) {
     count = usb_web.read(buf, 64);
     echo_all(buf, count);
   }
 }
 
-void line_state_callback(bool connected)
-{
+void line_state_callback(bool connected) {
   digitalWrite(led_pin, connected);
 
-  if ( connected )
-  {
+  if (connected) {
     usb_web.println("WebUSB interface connected !!");
     usb_web.flush();
   }
diff --git a/src/arduino/Adafruit_USBD_Interface.h b/src/arduino/Adafruit_USBD_Interface.h
index 7103958c..3527516c 100644
--- a/src/arduino/Adafruit_USBD_Interface.h
+++ b/src/arduino/Adafruit_USBD_Interface.h
@@ -28,6 +28,12 @@
 #include <stddef.h>
 #include <stdint.h>
 
+#if defined(CH32V20x) || defined(CH32V30x)
+// HACK: required for ch32 core version 1.0.4 or prior, removed when 1.0.5 is
+// released
+extern "C" void yield(void);
+#endif
+
 class Adafruit_USBD_Interface {
 protected:
   uint8_t _strid;