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diff --git a/tinyusb/examples/device/webusb_serial/src/main.c b/tinyusb/examples/device/webusb_serial/src/main.c
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--- a/tinyusb/examples/device/webusb_serial/src/main.c
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-/*
- * The MIT License (MIT)
- *
- * Copyright (c) 2019 Ha Thach (tinyusb.org)
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- *
- */
-
-/* This example demonstrates WebUSB as web serial with browser with WebUSB support (e.g Chrome).
- * After enumerated successfully, browser will pop-up notification
- * with URL to landing page, click on it to test
- * - Click "Connect" and select device, When connected the on-board LED will litted up.
- * - Any charters received from either webusb/Serial will be echo back to webusb and Serial
- *
- * Note:
- * - The WebUSB landing page notification is currently disabled in Chrome
- * on Windows due to Chromium issue 656702 (https://crbug.com/656702). You have to
- * go to landing page (below) to test
- *
- * - On Windows 7 and prior: You need to use Zadig tool to manually bind the
- * WebUSB interface with the WinUSB driver for Chrome to access. From windows 8 and 10, this
- * is done automatically by firmware.
- *
- * - On Linux/macOS, udev permission may need to be updated by
- * - copying '/examples/device/99-tinyusb.rules' file to /etc/udev/rules.d/ then
- * - run 'sudo udevadm control --reload-rules && sudo udevadm trigger'
- */
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-
-#include "bsp/board.h"
-#include "tusb.h"
-#include "usb_descriptors.h"
-
-//--------------------------------------------------------------------+
-// MACRO CONSTANT TYPEDEF PROTYPES
-//--------------------------------------------------------------------+
-
-/* Blink pattern
- * - 250 ms : device not mounted
- * - 1000 ms : device mounted
- * - 2500 ms : device is suspended
- */
-enum {
- BLINK_NOT_MOUNTED = 250,
- BLINK_MOUNTED = 1000,
- BLINK_SUSPENDED = 2500,
-
- BLINK_ALWAYS_ON = UINT32_MAX,
- BLINK_ALWAYS_OFF = 0
-};
-
-static uint32_t blink_interval_ms = BLINK_NOT_MOUNTED;
-
-#define URL "example.tinyusb.org/webusb-serial/"
-
-const tusb_desc_webusb_url_t desc_url =
-{
- .bLength = 3 + sizeof(URL) - 1,
- .bDescriptorType = 3, // WEBUSB URL type
- .bScheme = 1, // 0: http, 1: https
- .url = URL
-};
-
-static bool web_serial_connected = false;
-
-//------------- prototypes -------------//
-void led_blinking_task(void);
-void cdc_task(void);
-void webserial_task(void);
-
-/*------------- MAIN -------------*/
-int main(void)
-{
- board_init();
-
- tusb_init();
-
- while (1)
- {
- tud_task(); // tinyusb device task
- cdc_task();
- webserial_task();
- led_blinking_task();
- }
-
- return 0;
-}
-
-// send characters to both CDC and WebUSB
-void echo_all(uint8_t buf[], uint32_t count)
-{
- // echo to web serial
- if ( web_serial_connected )
- {
- tud_vendor_write(buf, count);
- }
-
- // echo to cdc
- if ( tud_cdc_connected() )
- {
- for(uint32_t i=0; i<count; i++)
- {
- tud_cdc_write_char(buf[i]);
-
- if ( buf[i] == '\r' ) tud_cdc_write_char('\n');
- }
- tud_cdc_write_flush();
- }
-}
-
-//--------------------------------------------------------------------+
-// Device callbacks
-//--------------------------------------------------------------------+
-
-// Invoked when device is mounted
-void tud_mount_cb(void)
-{
- blink_interval_ms = BLINK_MOUNTED;
-}
-
-// Invoked when device is unmounted
-void tud_umount_cb(void)
-{
- blink_interval_ms = BLINK_NOT_MOUNTED;
-}
-
-// Invoked when usb bus is suspended
-// remote_wakeup_en : if host allow us to perform remote wakeup
-// Within 7ms, device must draw an average of current less than 2.5 mA from bus
-void tud_suspend_cb(bool remote_wakeup_en)
-{
- (void) remote_wakeup_en;
- blink_interval_ms = BLINK_SUSPENDED;
-}
-
-// Invoked when usb bus is resumed
-void tud_resume_cb(void)
-{
- blink_interval_ms = BLINK_MOUNTED;
-}
-
-//--------------------------------------------------------------------+
-// WebUSB use vendor class
-//--------------------------------------------------------------------+
-
-// Invoked when a control transfer occurred on an interface of this class
-// Driver response accordingly to the request and the transfer stage (setup/data/ack)
-// return false to stall control endpoint (e.g unsupported request)
-bool tud_vendor_control_xfer_cb(uint8_t rhport, uint8_t stage, tusb_control_request_t const * request)
-{
- // nothing to with DATA & ACK stage
- if (stage != CONTROL_STAGE_SETUP) return true;
-
- switch (request->bmRequestType_bit.type)
- {
- case TUSB_REQ_TYPE_VENDOR:
- switch (request->bRequest)
- {
- case VENDOR_REQUEST_WEBUSB:
- // match vendor request in BOS descriptor
- // Get landing page url
- return tud_control_xfer(rhport, request, (void*) &desc_url, desc_url.bLength);
-
- case VENDOR_REQUEST_MICROSOFT:
- if ( request->wIndex == 7 )
- {
- // Get Microsoft OS 2.0 compatible descriptor
- uint16_t total_len;
- memcpy(&total_len, desc_ms_os_20+8, 2);
-
- return tud_control_xfer(rhport, request, (void*) desc_ms_os_20, total_len);
- }else
- {
- return false;
- }
-
- default: break;
- }
- break;
-
- case TUSB_REQ_TYPE_CLASS:
- if (request->bRequest == 0x22)
- {
- // Webserial simulate the CDC_REQUEST_SET_CONTROL_LINE_STATE (0x22) to connect and disconnect.
- web_serial_connected = (request->wValue != 0);
-
- // Always lit LED if connected
- if ( web_serial_connected )
- {
- board_led_write(true);
- blink_interval_ms = BLINK_ALWAYS_ON;
-
- tud_vendor_write_str("\r\nTinyUSB WebUSB device example\r\n");
- }else
- {
- blink_interval_ms = BLINK_MOUNTED;
- }
-
- // response with status OK
- return tud_control_status(rhport, request);
- }
- break;
-
- default: break;
- }
-
- // stall unknown request
- return false;
-}
-
-void webserial_task(void)
-{
- if ( web_serial_connected )
- {
- if ( tud_vendor_available() )
- {
- uint8_t buf[64];
- uint32_t count = tud_vendor_read(buf, sizeof(buf));
-
- // echo back to both web serial and cdc
- echo_all(buf, count);
- }
- }
-}
-
-
-//--------------------------------------------------------------------+
-// USB CDC
-//--------------------------------------------------------------------+
-void cdc_task(void)
-{
- if ( tud_cdc_connected() )
- {
- // connected and there are data available
- if ( tud_cdc_available() )
- {
- uint8_t buf[64];
-
- uint32_t count = tud_cdc_read(buf, sizeof(buf));
-
- // echo back to both web serial and cdc
- echo_all(buf, count);
- }
- }
-}
-
-// Invoked when cdc when line state changed e.g connected/disconnected
-void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts)
-{
- (void) itf;
-
- // connected
- if ( dtr && rts )
- {
- // print initial message when connected
- tud_cdc_write_str("\r\nTinyUSB WebUSB device example\r\n");
- }
-}
-
-// Invoked when CDC interface received data from host
-void tud_cdc_rx_cb(uint8_t itf)
-{
- (void) itf;
-}
-
-//--------------------------------------------------------------------+
-// BLINKING TASK
-//--------------------------------------------------------------------+
-void led_blinking_task(void)
-{
- static uint32_t start_ms = 0;
- static bool led_state = false;
-
- // Blink every interval ms
- if ( board_millis() - start_ms < blink_interval_ms) return; // not enough time
- start_ms += blink_interval_ms;
-
- board_led_write(led_state);
- led_state = 1 - led_state; // toggle
-}
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