added copy of hackrf usb stack

firmware/baseband/sd_over_usb/usb_bulk_buffer.h

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2012-2022 Great Scott Gadgets <info@greatscottgadgets.com>
+ * Copyright 2012 Jared Boone
+ * Copyright 2013 Benjamin Vernoux
+ *
+ * This file is part of HackRF.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __USB_BULK_BUFFER_H__
+#define __USB_BULK_BUFFER_H__
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#define USB_BULK_BUFFER_SIZE 0x8000
+#define USB_BULK_BUFFER_MASK 0x7FFF
+
+/* Address of usb_bulk_buffer is set in ldscripts. If you change the name of this
+ * variable, it won't be where it needs to be in the processor's address space,
+ * unless you also adjust the ldscripts.
+ */
+extern uint8_t usb_bulk_buffer[USB_BULK_BUFFER_SIZE];
+
+#endif /*__USB_BULK_BUFFER_H__*/