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diff --git a/tinyusb/src/class/dfu/dfu_device.h b/tinyusb/src/class/dfu/dfu_device.h
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+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021 XMOS LIMITED
+ *
+ * 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_DFU_DEVICE_H_
+#define _TUSB_DFU_DEVICE_H_
+
+#include "dfu.h"
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+//--------------------------------------------------------------------+
+// Class Driver Default Configure & Validation
+//--------------------------------------------------------------------+
+
+#if !defined(CFG_TUD_DFU_XFER_BUFSIZE)
+  #error "CFG_TUD_DFU_XFER_BUFSIZE must be defined, it has to be set to the buffer size used in TUD_DFU_DESCRIPTOR"
+#endif
+
+//--------------------------------------------------------------------+
+// Application API
+//--------------------------------------------------------------------+
+
+// Must be called when the application is done with flashing started by
+// tud_dfu_download_cb() and tud_dfu_manifest_cb().
+// status is DFU_STATUS_OK if successful, any other error status will cause state to enter dfuError
+void tud_dfu_finish_flashing(uint8_t status);
+
+//--------------------------------------------------------------------+
+// Application Callback API (weak is optional)
+//--------------------------------------------------------------------+
+
+// Note: alt is used as the partition number, in order to support multiple partitions like FLASH, EEPROM, etc.
+
+// Invoked right before tud_dfu_download_cb() (state=DFU_DNBUSY) or tud_dfu_manifest_cb() (state=DFU_MANIFEST)
+// Application return timeout in milliseconds (bwPollTimeout) for the next download/manifest operation.
+// During this period, USB host won't try to communicate with us.
+uint32_t tud_dfu_get_timeout_cb(uint8_t alt, uint8_t state);
+
+// Invoked when received DFU_DNLOAD (wLength>0) following by DFU_GETSTATUS (state=DFU_DNBUSY) requests
+// This callback could be returned before flashing op is complete (async).
+// Once finished flashing, application must call tud_dfu_finish_flashing()
+void tud_dfu_download_cb (uint8_t alt, uint16_t block_num, uint8_t const *data, uint16_t length);
+
+// Invoked when download process is complete, received DFU_DNLOAD (wLength=0) following by DFU_GETSTATUS (state=Manifest)
+// Application can do checksum, or actual flashing if buffered entire image previously.
+// Once finished flashing, application must call tud_dfu_finish_flashing()
+void tud_dfu_manifest_cb(uint8_t alt);
+
+// Invoked when received DFU_UPLOAD request
+// Application must populate data with up to length bytes and
+// Return the number of written bytes
+TU_ATTR_WEAK uint16_t tud_dfu_upload_cb(uint8_t alt, uint16_t block_num, uint8_t* data, uint16_t length);
+
+// Invoked when a DFU_DETACH request is received
+TU_ATTR_WEAK void tud_dfu_detach_cb(void);
+
+// Invoked when the Host has terminated a download or upload transfer
+TU_ATTR_WEAK void tud_dfu_abort_cb(uint8_t alt);
+
+//--------------------------------------------------------------------+
+// Internal Class Driver API
+//--------------------------------------------------------------------+
+void     dfu_moded_init(void);
+void     dfu_moded_reset(uint8_t rhport);
+uint16_t dfu_moded_open(uint8_t rhport, tusb_desc_interface_t const * itf_desc, uint16_t max_len);
+bool     dfu_moded_control_xfer_cb(uint8_t rhport, uint8_t stage, tusb_control_request_t const * request);
+
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* _TUSB_DFU_MODE_DEVICE_H_ */