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diff --git a/circuitpython/lib/tinyusb/src/host/usbh.h b/circuitpython/lib/tinyusb/src/host/usbh.h
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+++ b/circuitpython/lib/tinyusb/src/host/usbh.h
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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 file is part of the TinyUSB stack.
+ */
+
+#ifndef _TUSB_USBH_H_
+#define _TUSB_USBH_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+#include "common/tusb_common.h"
+#include "hcd.h"
+
+//--------------------------------------------------------------------+
+// MACRO CONSTANT TYPEDEF
+//--------------------------------------------------------------------+
+
+typedef bool (*tuh_control_complete_cb_t)(uint8_t daddr, tusb_control_request_t const * request, xfer_result_t result);
+
+//--------------------------------------------------------------------+
+// APPLICATION API
+//--------------------------------------------------------------------+
+
+// Init host stack
+bool tuh_init(uint8_t rhport);
+
+// Check if host stack is already initialized
+bool tuh_inited(void);
+
+// Task function should be called in main/rtos loop
+void tuh_task(void);
+
+// Interrupt handler, name alias to HCD
+extern void hcd_int_handler(uint8_t rhport);
+#define tuh_int_handler   hcd_int_handler
+
+bool tuh_vid_pid_get(uint8_t daddr, uint16_t* vid, uint16_t* pid);
+
+tusb_speed_t tuh_speed_get(uint8_t daddr);
+
+// Check if device is connected and configured
+bool tuh_mounted(uint8_t daddr);
+
+// Check if device is suspended
+TU_ATTR_ALWAYS_INLINE
+static inline bool tuh_suspended(uint8_t daddr)
+{
+  // TODO implement suspend & resume on host
+  (void) daddr;
+  return false;
+}
+
+// Check if device is ready to communicate with
+TU_ATTR_ALWAYS_INLINE
+static inline bool tuh_ready(uint8_t daddr)
+{
+  return tuh_mounted(daddr) && !tuh_suspended(daddr);
+}
+
+// Carry out control transfer
+bool tuh_control_xfer (uint8_t daddr, tusb_control_request_t const* request, void* buffer, tuh_control_complete_cb_t complete_cb);
+
+// Set Configuration
+// config_num = 0 will un-configure device. Note: config_num = config_descriptor_index + 1
+bool tuh_configuration_set(uint8_t daddr, uint8_t config_num, tuh_control_complete_cb_t complete_cb);
+
+//------------- descriptors -------------//
+
+// Get an descriptor
+bool tuh_descriptor_get(uint8_t daddr, uint8_t type, uint8_t index,
+                        void* buffer, uint16_t len, tuh_control_complete_cb_t complete_cb);
+
+// Get device descriptor
+bool tuh_descriptor_device_get(uint8_t daddr, void* buffer, uint16_t len, tuh_control_complete_cb_t complete_cb);
+
+// Get configuration descriptor
+bool tuh_descriptor_configuration_get(uint8_t daddr, uint8_t index, void* buffer, uint16_t len, tuh_control_complete_cb_t complete_cb);
+
+// Get string descriptor
+bool tuh_descriptor_string_get(uint8_t daddr, uint16_t language_id, uint8_t index,
+                               void* buffer, uint16_t len, tuh_control_complete_cb_t complete_cb);
+
+// Get manufacturer string descriptor
+bool tuh_descriptor_string_manufacturer_get(uint8_t daddr, uint16_t language_id, void* buffer, uint16_t len, tuh_control_complete_cb_t complete_cb);
+
+// Get product string descriptor
+bool tuh_descriptor_string_product_get(uint8_t daddr, uint16_t language_id, void* buffer, uint16_t len, tuh_control_complete_cb_t complete_cb);
+
+// Get serial string descriptor
+bool tuh_descriptor_string_serial_get(uint8_t daddr, uint16_t language_id, void* buffer, uint16_t len, tuh_control_complete_cb_t complete_cb);
+
+//--------------------------------------------------------------------+
+// APPLICATION CALLBACK
+//--------------------------------------------------------------------+
+//TU_ATTR_WEAK uint8_t tuh_attach_cb (tusb_desc_device_t const *desc_device);
+
+// Invoked when device is mounted (configured)
+TU_ATTR_WEAK void tuh_mount_cb (uint8_t daddr);
+
+/// Invoked when device is unmounted (bus reset/unplugged)
+TU_ATTR_WEAK void tuh_umount_cb(uint8_t daddr);
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif