diff --git a/sysmoOCTSIM/usb/device/usbdc.c b/sysmoOCTSIM/usb/device/usbdc.c
new file mode 100644
index 0000000..3cfd7bc
--- /dev/null
+++ b/sysmoOCTSIM/usb/device/usbdc.c
@@ -0,0 +1,1027 @@
+/**
+ * \file
+ *
+ * \brief USB Device Stack Core Layer Implementation.
+ *
+ * Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * Subject to your compliance with these terms, you may use Microchip
+ * software and any derivatives exclusively with Microchip products.
+ * It is your responsibility to comply with third party license terms applicable
+ * to your use of third party software (including open source software) that
+ * may accompany Microchip software.
+ *
+ * THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS". NO WARRANTIES,
+ * WHETHER EXPRESS, IMPLIED OR STATUTORY, APPLY TO THIS SOFTWARE,
+ * INCLUDING ANY IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY,
+ * AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL MICROCHIP BE
+ * LIABLE FOR ANY INDIRECT, SPECIAL, PUNITIVE, INCIDENTAL OR CONSEQUENTIAL
+ * LOSS, DAMAGE, COST OR EXPENSE OF ANY KIND WHATSOEVER RELATED TO THE
+ * SOFTWARE, HOWEVER CAUSED, EVEN IF MICROCHIP HAS BEEN ADVISED OF THE
+ * POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT
+ * ALLOWED BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY
+ * RELATED TO THIS SOFTWARE WILL NOT EXCEED THE AMOUNT OF FEES, IF ANY,
+ * THAT YOU HAVE PAID DIRECTLY TO MICROCHIP FOR THIS SOFTWARE.
+ *
+ * \asf_license_stop
+ *
+ */
+
+#include "usbdc.h"
+
+#define USBDC_VERSION 0x00000001u
+
+/**
+ * \brief USB Device Core Sof Handler
+ */
+struct usbdc_sof_handler {
+	struct usbdc_sof_handler *next;
+	usbdc_sof_cb_t            cb;
+};
+
+/**
+ * \brief USB Device Core Request Handler
+ */
+struct usbdc_req_handler {
+	struct usbdc_req_handler *next;
+	usbdc_req_cb_t            cb;
+};
+
+/**
+ * \brief USB Device Core Change Handler
+ */
+struct usbdc_change_handler {
+	struct usbdc_change_handler *next;
+	usbdc_change_cb_t            cb;
+};
+
+/**
+ * \brief USB Device Core Handler
+ */
+struct usbdc_handlers {
+	struct list_descriptor sof_list;
+	struct list_descriptor req_list;
+	struct list_descriptor change_list;
+};
+
+/**
+ * \brief USB Device Core Driver Structure
+ */
+struct usbdc_driver {
+	/** Pointer to descriptions of descriptors. */
+	struct usbdc_descriptors desces;
+	/** Callback handlers. */
+	struct usbdc_handlers handlers;
+	/** list of function drivers. */
+	struct list_descriptor func_list;
+	/** Control buffer. */
+	uint8_t *ctrl_buf;
+	/** Device status. */
+	uint16_t status;
+	/** Device state. */
+	uint8_t state;
+	/** Configuration value. */
+	uint8_t cfg_value;
+	/** Control endpoint size. */
+	uint8_t ctrl_size;
+	/** Alternate interface used map */
+	uint8_t ifc_alt_map;
+};
+
+/**
+ * \brief USB Device Core Driver Instance
+ */
+static struct usbdc_driver usbdc;
+
+/**
+ * \brief Process the GetDeviceDescriptor request
+ * \param[in] ep Endpoint address.
+ * \param[in] req Pointer to the request.
+ * \return Operation status.
+ * \retval true Request is handled OK.
+ * \retval false Request not supported.
+ */
+static bool usbdc_get_dev_desc(const uint8_t ep, struct usb_req *req)
+{
+	uint8_t *dev_desc = NULL;
+	uint16_t length   = req->wLength;
+	if (length > 0x12) {
+		length = 0x12;
+	}
+#if CONF_USBD_HS_SP
+	if (usb_d_get_speed() == USB_SPEED_HS && usbdc.desces.hs) {
+		dev_desc = usb_find_desc(usbdc.desces.hs->sod, usbdc.desces.hs->eod, USB_DT_DEVICE);
+	} else {
+		/* Obtain descriptor from FS descriptors */
+	}
+#endif
+	if (!dev_desc) {
+		dev_desc = usb_find_desc(usbdc.desces.ls_fs->sod, usbdc.desces.ls_fs->eod, USB_DT_DEVICE);
+	}
+	if (!dev_desc) {
+		return false;
+	}
+	if (ERR_NONE != usbdc_xfer(ep, dev_desc, length, false)) {
+		return false;
+	}
+	return true;
+}
+
+/**
+ * \brief Process the GetConfigurationDescriptor request
+ * \param[in] ep Endpoint address.
+ * \param[in] req Pointer to the request.
+ * \return Operation status.
+ * \retval true Request is handled OK.
+ * \retval false Request not supported.
+ */
+static bool usbdc_get_cfg_desc(const uint8_t ep, struct usb_req *req)
+{
+	uint8_t *cfg_desc = NULL;
+	uint16_t total_len;
+	uint16_t length   = req->wLength;
+	uint8_t  index    = req->wValue & 0x00FF;
+	bool     need_zlp = !(length & (usbdc.ctrl_size - 1));
+
+#if CONF_USBD_HS_SP
+	if (usb_d_get_speed() == USB_SPEED_HS && usbdc.desces.hs) {
+		cfg_desc = usb_find_cfg_desc(usbdc.desces.hs->sod, usbdc.desces.hs->eod, index + 1);
+	} else {
+		/* Obtain descriptor from FS descriptors */
+	}
+#endif
+	if (!cfg_desc) {
+		cfg_desc = usb_find_cfg_desc(usbdc.desces.ls_fs->sod, usbdc.desces.ls_fs->eod, index + 1);
+	}
+	if (NULL == cfg_desc) {
+		return false;
+	}
+	total_len = usb_cfg_desc_total_len(cfg_desc);
+	if (length <= total_len) {
+		need_zlp = false;
+	} else {
+		length = total_len;
+	}
+	if (ERR_NONE != usbdc_xfer(ep, cfg_desc, length, need_zlp)) {
+		return false;
+	}
+	return true;
+}
+
+/**
+ * \brief Process the GetStringDescriptor request
+ * \param[in] ep Endpoint address.
+ * \param[in] req Pointer to the request.
+ * \return Operation status.
+ * \retval true Request is handled OK.
+ * \retval false Request not supported.
+ */
+static bool usbdc_get_str_desc(const uint8_t ep, struct usb_req *req)
+{
+	uint8_t *str_desc;
+	uint16_t length   = req->wLength;
+	uint8_t  index    = req->wValue & 0x00FF;
+	bool     need_zlp = !(length & (usbdc.ctrl_size - 1));
+	/* All string are in default descriptors block: FS/LS */
+	str_desc = usb_find_str_desc(usbdc.desces.ls_fs->sod, usbdc.desces.ls_fs->eod, index);
+	if (NULL == str_desc) {
+		return false;
+	}
+	if (length <= str_desc[0]) {
+		need_zlp = false;
+	} else {
+		length = str_desc[0];
+	}
+	if (ERR_NONE != usbdc_xfer(ep, str_desc, length, need_zlp)) {
+		return false;
+	}
+	return true;
+}
+
+#if CONF_USBD_HS_SP
+/**
+ * \brief Process the GetDeviceQualifierDescriptor request
+ * \param[in] ep Endpoint address.
+ * \param[in] req Pointer to the request.
+ * \return Operation status.
+ * \retval true Request is handled OK.
+ * \retval false Request not supported.
+ */
+static bool usbdc_get_devqual_desc(const uint8_t ep, struct usb_req *req)
+{
+	uint8_t *dev_desc = NULL;
+	uint16_t length   = req->wLength;
+	if (length > 0x12) {
+		length = 0x12;
+	}
+	if (usb_d_get_speed() == USB_SPEED_HS && usbdc.desces.hs) {
+		dev_desc = usb_find_desc(usbdc.desces.hs->sod, usbdc.desces.hs->eod, USB_DT_DEVICE_QUALIFIER);
+	}
+	if (!dev_desc) {
+		dev_desc = usb_find_desc(usbdc.desces.ls_fs->sod, usbdc.desces.ls_fs->eod, USB_DT_DEVICE_QUALIFIER);
+	}
+	if (!dev_desc) {
+		return false;
+	}
+	if (ERR_NONE != usbdc_xfer(ep, dev_desc, length, false)) {
+		return false;
+	}
+	return true;
+}
+
+/**
+ * \brief Process the GetOtherSpeedConfigurationDescriptor request
+ * \param[in] ep Endpoint address.
+ * \param[in] req Pointer to the request.
+ * \return Operation status.
+ * \retval true Request is handled OK.
+ * \retval false Request not supported.
+ */
+static bool usbdc_get_othspdcfg_desc(const uint8_t ep, struct usb_req *req)
+{
+	uint8_t *cfg_desc = NULL;
+	uint16_t total_len;
+	uint16_t length   = req->wLength;
+	uint8_t  index    = req->wValue & 0x00FF;
+	bool     need_zlp = !(length & (usbdc.ctrl_size - 1));
+
+	if (usb_d_get_speed() == USB_SPEED_HS && usbdc.desces.hs) {
+		cfg_desc = usb_find_othspdcfg_desc(usbdc.desces.hs->sod, usbdc.desces.hs->eod, index + 1);
+	} else {
+		/* Obtain descriptor from FS descriptors */
+	}
+	if (!cfg_desc) {
+		cfg_desc = usb_find_othspdcfg_desc(usbdc.desces.ls_fs->sod, usbdc.desces.ls_fs->eod, index + 1);
+	}
+	if (NULL == cfg_desc) {
+		return false;
+	}
+	total_len = usb_cfg_desc_total_len(cfg_desc);
+	if (length <= total_len) {
+		need_zlp = false;
+	} else {
+		length = total_len;
+	}
+	if (ERR_NONE != usbdc_xfer(ep, cfg_desc, length, need_zlp)) {
+		return false;
+	}
+	return true;
+}
+#endif
+
+/**
+ * \brief Process the GetDescriptor request
+ * \param[in] ep Endpoint address.
+ * \param[in] req Pointer to the request.
+ * \return Operation status.
+ * \retval true Request is handled OK.
+ * \retval false Request not supported.
+ */
+static bool usbdc_get_desc_req(const uint8_t ep, struct usb_req *req)
+{
+	uint8_t type = (uint8_t)(req->wValue >> 8);
+	switch (type) {
+	case USB_DT_DEVICE:
+		return usbdc_get_dev_desc(ep, req);
+	case USB_DT_CONFIG:
+		return usbdc_get_cfg_desc(ep, req);
+#if CONF_USBD_HS_SP
+	case USB_DT_DEVICE_QUALIFIER:
+		return usbdc_get_devqual_desc(ep, req);
+	case USB_DT_OTHER_SPEED_CONFIG:
+		return usbdc_get_othspdcfg_desc(ep, req);
+#endif
+	case USB_DT_STRING:
+		return usbdc_get_str_desc(ep, req);
+	default:
+		break;
+	}
+	return false;
+}
+
+/**
+ * \brief Process the GetStatus request
+ * \param[in] ep Endpoint address.
+ * \param[in] req Pointer to the request.
+ * \return Operation status.
+ * \retval true Request is handled OK.
+ * \retval false Request not supported.
+ */
+static bool usbdc_get_status_req(const uint8_t ep, const struct usb_req *req)
+{
+	int32_t st;
+	(void)ep;
+
+	switch (req->bmRequestType & USB_REQT_RECIP_MASK) {
+	case USB_REQT_RECIP_DEVICE:
+	case USB_REQT_RECIP_INTERFACE:
+		st = 0;
+		break;
+	case USB_REQT_RECIP_ENDPOINT:
+		st = usb_d_ep_halt(req->wIndex & 0xFF, USB_EP_HALT_GET);
+		if (st < 0) {
+			return false;
+		}
+		st = st & 0x1;
+		break;
+	default:
+		return false;
+	}
+	memcpy(usbdc.ctrl_buf, &st, 2);
+	usbdc_xfer(ep, usbdc.ctrl_buf, 2, false);
+	return true;
+}
+
+/**
+ * \brief Process the standard Get Interface
+ * \param[in] req Point to usb request struct.
+ * \return Operation status.
+ * \retval true Request is handled OK.
+ * \retval false Request not supported.
+ */
+static bool usbdc_get_interface(struct usb_req *req)
+{
+	struct usbdf_driver *func = (struct usbdf_driver *)usbdc.func_list.head;
+	int32_t              rc;
+
+	if (!(usbdc.ifc_alt_map & (1 << req->wIndex))) {
+		/* Return 0 if alternate is not used */
+		usbdc.ctrl_buf[0] = 0;
+		usbdc_xfer(0, usbdc.ctrl_buf, 1, false);
+		return true;
+	}
+	/* Check function drivers only if alternate is used */
+	while (NULL != func) {
+		if (0 > (rc = func->ctrl(func, USBDF_GET_IFACE, req))) {
+			func = func->next;
+		} else {
+			usbdc.ctrl_buf[0] = (uint8_t)rc;
+			usbdc_xfer(0, usbdc.ctrl_buf, 1, false);
+			return true;
+		}
+	}
+	return false;
+}
+
+/**
+ * \brief Process the standard Get request
+ * \param[in] ep Endpoint address.
+ * \param[in] req Pointer to the request.
+ * \return Operation status.
+ * \retval true Request is handled OK.
+ * \retval false Request not supported.
+ */
+static bool usbdc_get_req(const uint8_t ep, struct usb_req *req)
+{
+	switch (req->bRequest) {
+	case USB_REQ_GET_DESC:
+		return usbdc_get_desc_req(ep, req);
+	case USB_REQ_GET_CONFIG:
+		*(uint8_t *)usbdc.ctrl_buf = usbdc.cfg_value;
+		usbdc_xfer(ep, usbdc.ctrl_buf, 1, false);
+		return true;
+	case USB_REQ_GET_STATUS:
+		return usbdc_get_status_req(ep, req);
+	case USB_REQ_GET_INTERFACE:
+		return usbdc_get_interface(req);
+	default:
+		return false;
+	}
+}
+
+/**
+ * \brief Process the standard ClearFeature request
+ * \param[in] ep Endpoint address.
+ * \param[in] req Pointer to the request.
+ * \return Operation status.
+ * \retval true Request is handled OK.
+ * \retval false Request not supported.
+ */
+static bool usbdc_clear_ftr_req(const uint8_t ep, const struct usb_req *req)
+{
+	(void)ep;
+	switch (req->bmRequestType & USB_REQT_RECIP_MASK) {
+	case USB_REQT_RECIP_ENDPOINT:
+		if (req->wLength != 0) {
+			return false;
+		}
+		usb_d_ep_halt(req->wIndex & 0xFF, USB_EP_HALT_CLR);
+		usbdc_xfer(ep, NULL, 0, true);
+		return true;
+	default:
+		return false;
+	}
+}
+
+/**
+ * \brief Process the standard SetFeature request
+ * \param[in] ep Endpoint address.
+ * \param[in] req Pointer to the request.
+ * \return Operation status.
+ * \retval true Request is handled OK.
+ * \retval false Request not supported.
+ */
+static bool usbdc_set_ftr_req(const uint8_t ep, const struct usb_req *req)
+{
+	(void)ep;
+	switch (req->bmRequestType & USB_REQT_RECIP_MASK) {
+	case USB_REQT_RECIP_ENDPOINT:
+		if (req->wLength != 0) {
+			return false;
+		}
+		usb_d_ep_halt(req->wIndex & 0xFF, USB_EP_HALT_SET);
+		usbdc_xfer(ep, NULL, 0, true);
+		return true;
+	default:
+		return false;
+	}
+}
+
+/**
+ * \brief Unconfig, close all interfaces
+ */
+static void usbdc_unconfig(void)
+{
+	struct usbdf_driver *func = (struct usbdf_driver *)usbdc.func_list.head;
+	while (NULL != func) {
+		func->ctrl(func, USBDF_DISABLE, NULL);
+		func = func->next;
+	}
+}
+
+/**
+ * \brief Apply Set Configuration Value
+ * \param[in] cfg_value Configuration Value
+ * \retval true Set configuration OK.
+ * \retval false Request error.
+ */
+static bool usbdc_set_config(uint8_t cfg_value)
+{
+	struct usbd_descriptors desc;
+	struct usbdf_driver *   func;
+	uint8_t *               cfg_desc = NULL;
+	uint16_t                total_len;
+	uint8_t                 last_iface = 0xFF;
+
+	if (cfg_value == 0) {
+		usbdc_unconfig();
+		return true;
+	}
+
+#if CONF_USBD_HS_SP
+	if (usb_d_get_speed() == USB_SPEED_HS && usbdc.desces.hs) {
+		cfg_desc = usb_find_cfg_desc(usbdc.desces.hs->sod, usbdc.desces.hs->eod, cfg_value);
+	} else {
+		/* Obtain descriptor from FS descriptors */
+	}
+#endif
+	if (!cfg_desc) {
+		cfg_desc = usb_find_cfg_desc(usbdc.desces.ls_fs->sod, usbdc.desces.ls_fs->eod, cfg_value);
+	}
+	if (NULL == cfg_desc) {
+		return false;
+	}
+
+	total_len = usb_cfg_desc_total_len(cfg_desc);
+	desc.eod  = cfg_desc + total_len;
+	desc.sod  = usb_find_desc(cfg_desc, desc.eod, USB_DT_INTERFACE);
+
+	while (NULL != desc.sod) {
+		/* Apply very first alternate setting (must be 0) of the interface */
+		if (last_iface != desc.sod[2] /* bInterfaceNumber */) {
+			last_iface = desc.sod[2];
+			func       = (struct usbdf_driver *)usbdc.func_list.head;
+			while (NULL != func) {
+				if (func->ctrl(func, USBDF_ENABLE, &desc)) {
+					func = func->next;
+				} else {
+					break;
+				}
+			}
+		}
+		desc.sod = usb_desc_next(desc.sod);
+		desc.sod = usb_find_desc(desc.sod, desc.eod, USB_DT_INTERFACE);
+	}
+	return true;
+}
+
+/**
+ * \brief Apply the USB device address
+ * \param[in] addr address to be set.
+ */
+static void usbdc_set_address(uint8_t addr)
+{
+	usb_d_set_address(addr);
+}
+
+/**
+ * \brief Process the standard Set Interface
+ * \param[in] alt_set Alternate Setting.
+ * \param[in] ifc_id Interface Index.
+ * \return Operation status.
+ * \retval true Request is handled OK.
+ * \retval false Request not supported.
+ */
+static bool usbdc_set_interface(uint16_t alt_set, uint16_t ifc_id)
+{
+	struct usbd_descriptors desc;
+	struct usbdf_driver *   func;
+	uint8_t *               ifc = NULL;
+
+#if CONF_USBD_HS_SP
+	if (usb_d_get_speed() == USB_SPEED_HS && usbdc.desces.hs) {
+		ifc = usb_find_cfg_desc(usbdc.desces.hs->sod, usbdc.desces.hs->eod, usbdc.cfg_value);
+	} else {
+		/* Obtain descriptor from FS descriptors */
+	}
+#endif
+	if (!ifc) {
+		ifc = usb_find_cfg_desc(usbdc.desces.ls_fs->sod, usbdc.desces.ls_fs->eod, usbdc.cfg_value);
+	}
+	if (NULL == ifc) {
+		return false;
+	}
+	desc.sod = ifc;
+	desc.eod = ifc + usb_cfg_desc_total_len(ifc);
+
+	if (NULL == (ifc = usb_find_desc(desc.sod, desc.eod, USB_DT_INTERFACE))) {
+		return false;
+	}
+
+	while (ifc[2] != ifc_id || ifc[3] != alt_set) {
+		desc.sod = usb_desc_next(desc.sod);
+		ifc      = usb_find_desc(desc.sod, desc.eod, USB_DT_INTERFACE);
+		if (NULL == ifc) {
+			return false;
+		}
+	}
+
+	desc.sod = ifc;
+	func     = (struct usbdf_driver *)usbdc.func_list.head;
+
+	while (NULL != func) {
+		if (func->ctrl(func, USBDF_DISABLE, &desc)) {
+			func = func->next;
+		} else if (ERR_NONE == func->ctrl(func, USBDF_ENABLE, &desc)) {
+			if (alt_set) {
+				/* Alternate settings are used from now on */
+				usbdc.ifc_alt_map |= 1 << ifc_id;
+			}
+			usbdc_xfer(0, NULL, 0, 0);
+			return true;
+		} else {
+			return false;
+		}
+	}
+
+	return false;
+}
+
+/**
+ * \brief Process the standard Set request
+ * \param[in] ep Endpoint address.
+ * \param[in] req Pointer to the request.
+ * \return Operation status.
+ * \retval true Request is handled OK.
+ * \retval false Request not supported.
+ */
+static bool usbdc_set_req(const uint8_t ep, struct usb_req *req)
+{
+	switch (req->bRequest) {
+	case USB_REQ_SET_ADDRESS:
+		return (ERR_NONE == usbdc_xfer(ep, NULL, 0, true));
+	case USB_REQ_SET_CONFIG:
+		if (!usbdc_set_config(req->wValue)) {
+			return false;
+		}
+		return (ERR_NONE == usbdc_xfer(ep, NULL, 0, true));
+	case USB_REQ_CLEAR_FTR:
+		return usbdc_clear_ftr_req(ep, req);
+	case USB_REQ_SET_FTR:
+		return usbdc_set_ftr_req(ep, req);
+	case USB_REQ_SET_INTERFACE:
+		return usbdc_set_interface(req->wValue, req->wIndex);
+	default:
+		return false;
+	}
+}
+
+/** Invoke all registered SOF callbacks. */
+static void usbdc_sof_notify(void)
+{
+	struct usbdc_sof_handler *sof = (struct usbdc_sof_handler *)usbdc.handlers.sof_list.head;
+
+	while (sof != NULL) {
+		if (NULL != sof->cb) {
+			sof->cb();
+		}
+		sof = sof->next;
+	}
+}
+
+/** Invoke all registered Change notification callbacks. */
+static void usbdc_change_notify(enum usbdc_change_type change, uint32_t value)
+{
+	struct usbdc_change_handler *cg = (struct usbdc_change_handler *)usbdc.handlers.change_list.head;
+
+	while (cg != NULL) {
+		if (NULL != cg->cb) {
+			cg->cb(change, value);
+		}
+		cg = cg->next;
+	}
+}
+
+/** Invoke all registered request callbacks until request handled. */
+static int32_t usbdc_request_handler(uint8_t ep, struct usb_req *req, enum usb_ctrl_stage stage)
+{
+	struct usbdc_req_handler *h = (struct usbdc_req_handler *)usbdc.handlers.req_list.head;
+	int32_t                   rc;
+
+	while (h != NULL) {
+		if (NULL != h->cb) {
+			rc = h->cb(ep, req, stage);
+			if (0 == rc) {
+				return true;
+			} else if (ERR_NOT_FOUND != rc) {
+				return -1;
+			}
+		}
+		h = h->next;
+	}
+	return false;
+}
+
+/**
+ * \brief Callback invoked on USB device SOF
+ */
+static void usbd_sof_cb(void)
+{
+	usbdc_sof_notify();
+}
+
+/**
+ * \brief Callback invoked when control request is received
+ * \param[in] ep Endpoint address.
+ * \param[in] req Pointer to the request.
+ * \return Operation status.
+ * \retval true Request is handled OK.
+ * \retval false Request not supported.
+ */
+static bool usbdc_cb_ctl_req(const uint8_t ep, struct usb_req *req)
+{
+	switch (usbdc_request_handler(ep, req, USB_SETUP_STAGE)) {
+	case true:
+		return true;
+	case -1:
+		return false;
+	default:
+		break;
+	}
+
+	// STD request handling
+	switch (req->bmRequestType & (USB_REQT_TYPE_MASK | USB_REQT_DIR_IN)) {
+	case USB_REQT_TYPE_STANDARD:
+		return usbdc_set_req(ep, req);
+	case (USB_REQT_TYPE_STANDARD | USB_REQT_DIR_IN):
+		return usbdc_get_req(ep, req);
+	default:
+		return false;
+	}
+}
+
+/**
+ * \brief When control status stage is end
+ * \param[in] req Pointer to the request.
+ */
+static void usbdc_ctrl_status_end(const struct usb_req *req)
+{
+	if (req->bmRequestType != USB_REQT_TYPE_STANDARD) {
+		return;
+	}
+	switch (req->bRequest) {
+	case USB_REQ_SET_CONFIG:
+		usbdc.cfg_value = req->wValue;
+		usbdc.state     = req->wValue ? USBD_S_CONFIG : USBD_S_ADDRESS;
+		usbdc_change_notify(USBDC_C_STATE, usbdc.state);
+		break;
+	case USB_REQ_SET_ADDRESS:
+		usbdc_set_address(req->wValue);
+		usbdc.state = req->wValue ? USBD_S_ADDRESS : USBD_S_DEFAULT;
+		usbdc_change_notify(USBDC_C_STATE, usbdc.state);
+		break;
+	default:
+		break;
+	}
+}
+
+/**
+ * \brief When control data stage is end
+ * \param[in] req Pointer to the request.
+ */
+static bool usbdc_ctrl_data_end(struct usb_req *req)
+{
+	usbdc_request_handler(0, req, USB_DATA_STAGE);
+	return false;
+}
+
+/**
+ * \brief Callback invoked when control data done or status done
+ * \param[in] ep Endpoint number with direction on bit 8.
+ * \param[in] code Status code.
+ * \param[in] req Pointer to the control setup request.
+ * \return Data has error or not.
+ * \retval true There is data error, protocol error.
+ * \retval false There is no data error.
+ */
+static bool usbdc_cb_ctl_done(const uint8_t ep, const enum usb_xfer_code code, struct usb_req *req)
+{
+	(void)ep;
+
+	switch (code) {
+	case USB_XFER_DONE:
+		usbdc_ctrl_status_end(req);
+		break;
+	case USB_XFER_DATA:
+		return usbdc_ctrl_data_end(req);
+	default:
+		break;
+	}
+	return false;
+}
+
+/**
+ * \brief USB Device Core Reset
+ */
+void usbdc_reset(void)
+{
+	usbdc_unconfig();
+
+	usbdc.state       = USBD_S_DEFAULT;
+	usbdc.cfg_value   = 0;
+	usbdc.ifc_alt_map = 0;
+
+	// Setup EP0
+	usb_d_ep_deinit(0);
+	usb_d_ep0_init(usbdc.ctrl_size);
+	usb_d_ep_register_callback(0, USB_D_EP_CB_SETUP, (FUNC_PTR)usbdc_cb_ctl_req);
+	usb_d_ep_register_callback(0, USB_D_EP_CB_XFER, (FUNC_PTR)usbdc_cb_ctl_done);
+	usb_d_ep_enable(0);
+}
+
+/**
+ * \brief Callback invoked on USB device events
+ * \param[in] ev Event code.
+ * \param[in] param Event parameter for event handling.
+ */
+static void usbd_event_cb(const enum usb_event ev, const uint32_t param)
+{
+	(void)param;
+
+	switch (ev) {
+	case USB_EV_VBUS:
+		usbdc_change_notify(USBDC_C_CONN, param);
+		break;
+
+	case USB_EV_RESET:
+		usbdc_reset();
+		break;
+
+	default:
+		break;
+	}
+}
+
+/**
+ * \brief Issue USB device transfer
+ */
+int32_t usbdc_xfer(uint8_t ep, uint8_t *buf, uint32_t size, bool zlp)
+{
+	struct usb_d_transfer xfer = {(uint8_t *)buf, size, ep, zlp};
+	return usb_d_ep_transfer(&xfer);
+}
+
+/**
+ * \brief Register the handler
+ */
+void usbdc_register_handler(enum usbdc_handler_type type, const struct usbdc_handler *h)
+{
+	switch (type) {
+	case USBDC_HDL_SOF:
+		list_insert_at_end(&usbdc.handlers.sof_list, (void *)h);
+		break;
+	case USBDC_HDL_REQ:
+		list_insert_at_end(&usbdc.handlers.req_list, (void *)h);
+		break;
+	case USBDC_HDL_CHANGE:
+		list_insert_at_end(&usbdc.handlers.change_list, (void *)h);
+		break;
+	default:
+		break;
+	}
+}
+
+/**
+ * \brief Unregister the handler
+ */
+void usbdc_unregister_handler(enum usbdc_handler_type type, const struct usbdc_handler *h)
+{
+	switch (type) {
+	case USBDC_HDL_SOF:
+		list_delete_element(&usbdc.handlers.sof_list, (void *)h);
+		break;
+	case USBDC_HDL_REQ:
+		list_delete_element(&usbdc.handlers.req_list, (void *)h);
+		break;
+	case USBDC_HDL_CHANGE:
+		list_delete_element(&usbdc.handlers.change_list, (void *)h);
+		break;
+	default:
+		break;
+	}
+}
+
+/**
+ * \brief Initialize the USB device core driver
+ */
+int32_t usbdc_init(uint8_t *ctrl_buf)
+{
+	ASSERT(ctrl_buf);
+
+	int32_t rc;
+
+	rc = usb_d_init();
+	if (rc < 0) {
+		return rc;
+	}
+
+	memset(&usbdc, 0, sizeof(usbdc));
+	usbdc.ctrl_buf = ctrl_buf;
+	usb_d_register_callback(USB_D_CB_SOF, (FUNC_PTR)usbd_sof_cb);
+	usb_d_register_callback(USB_D_CB_EVENT, (FUNC_PTR)usbd_event_cb);
+
+	return 0;
+}
+
+/**
+ * \brief De-initialize the USB device core driver
+ */
+int32_t usbdc_deinit(void)
+{
+	usb_d_deinit();
+	return 0;
+}
+
+/**
+ * \brief Register/unregister function support of a USB device function
+ *
+ * Must be invoked when USB device is stopped.
+ */
+void usbdc_register_function(struct usbdf_driver *func)
+{
+	list_insert_at_end(&usbdc.func_list, func);
+}
+
+/**
+ * \brief Unregister function support of a USB device function
+ *
+ * Must be invoked when USB device is stopped.
+ */
+void usbdc_unregister_function(struct usbdf_driver *func)
+{
+	list_delete_element(&usbdc.func_list, func);
+}
+
+/**
+ * \brief Validate the descriptor
+ */
+int32_t usbdc_validate_desces(struct usbd_descriptors *desces)
+{
+	uint8_t *sod, *eod;
+	if (desces == NULL) {
+		return ERR_NOT_FOUND;
+	}
+	sod = usb_find_desc(desces->sod, desces->eod, USB_DT_DEVICE);
+	if (sod == NULL) {
+		return ERR_BAD_DATA;
+	}
+	sod = usb_find_desc(desces->sod, desces->eod, USB_DT_CONFIG);
+	if (sod == NULL) {
+		return ERR_BAD_DATA;
+	}
+	eod = sod + usb_cfg_desc_total_len(sod);
+	if (eod > desces->eod) {
+		return ERR_BAD_DATA;
+	}
+	return 0;
+}
+
+/**
+ * \brief Validate the descriptor
+ */
+int32_t usbdc_check_desces(struct usbdc_descriptors *desces)
+{
+#if CONF_USBD_HS_SP
+	int32_t rc;
+	if (desces->hs == NULL && desces->ls_fs == NULL) {
+		return ERR_NOT_FOUND;
+	}
+	if (desces->hs) {
+		rc = usbdc_validate_desces(desces->hs);
+		if (rc < 0) {
+			return rc;
+		}
+	}
+#endif
+	return usbdc_validate_desces(desces->ls_fs);
+}
+
+/**
+ * \brief Start the USB device driver with specific descriptors set
+ */
+int32_t usbdc_start(struct usbd_descriptors *desces)
+{
+	if (usbdc.state >= USBD_S_POWER) {
+		return ERR_BUSY;
+	}
+
+	if (desces) {
+		usbdc.desces.ls_fs = desces;
+#if CONF_USBD_HS_SP
+		usbdc.desces.hs = &desces[1];
+#endif
+	} else {
+		return ERR_BAD_DATA;
+	}
+
+	usbdc.ctrl_size = desces->sod[7];
+	usbdc.state     = USBD_S_POWER;
+	usb_d_enable();
+	return ERR_NONE;
+}
+
+/**
+ * \brief Stop the USB device driver
+ */
+int32_t usbdc_stop(void)
+{
+	usb_d_disable();
+	usbdc.state = USBD_S_OFF;
+	return ERR_NONE;
+}
+
+/**
+ * \brief Attach the USB device to host
+ */
+void usbdc_attach(void)
+{
+	usb_d_attach();
+}
+
+/**
+ * \brief Detach the USB device from host
+ */
+void usbdc_detach(void)
+{
+	usb_d_detach();
+}
+
+/**
+ * \brief Send remote wakeup to host
+ */
+void usbdc_remotewakeup(void)
+{
+	usb_d_send_remotewakeup();
+	usbdc.state = USBD_S_POWER;
+}
+
+/**
+ * \brief Return USB Device endpoint0 buffer
+ */
+uint8_t *usbdc_get_ctrl_buffer(void)
+{
+	return usbdc.ctrl_buf;
+}
+
+/**
+ * \brief Return current USB state
+ */
+uint8_t usbdc_get_state(void)
+{
+	if (usbdc.state & USBD_S_SUSPEND) {
+		return USBD_S_SUSPEND;
+	}
+	return usbdc.state;
+}
+
+/**
+ * \brief Return version
+ */
+uint32_t usbdc_get_version(void)
+{
+	return USBDC_VERSION;
+}