remove comments to reduce rows

19 files changed, 181 insertions, 844 deletions

diff --git a/class/audio/usbd_audio.c b/class/audio/usbd_audio.c
index 2201d175..28185c58 100644
--- a/class/audio/usbd_audio.c
+++ b/class/audio/usbd_audio.c
@@ -63,6 +63,7 @@ struct audio_entity_info {
 
 static usb_slist_t usbd_audio_entity_info_head = USB_SLIST_OBJECT_INIT(usbd_audio_entity_info_head);
 
+#if CONFIG_USBDEV_AUDIO_VERSION >= 0x0200
 const uint8_t default_sampling_freq_table[] = {
     AUDIO_SAMPLE_FREQ_NUM(1),
     // AUDIO_SAMPLE_FREQ_4B(8000),
@@ -90,6 +91,7 @@ const uint8_t default_sampling_freq_table[] = {
     AUDIO_SAMPLE_FREQ_4B(192000),
     AUDIO_SAMPLE_FREQ_4B(0x00),
 };
+#endif
 
 #if CONFIG_USBDEV_AUDIO_VERSION < 0x0200
 static int audio_custom_request_handler(struct usb_setup_packet *setup, uint8_t **data, uint32_t *len)
@@ -144,7 +146,9 @@ static int audio_class_request_handler(struct usb_setup_packet *setup, uint8_t *
 
     struct audio_entity_info *current_entity_info = NULL;
     struct usbd_audio_attribute_control *current_feature_control = NULL;
+#if CONFIG_USBDEV_AUDIO_VERSION >= 0x0200
     uint32_t *sampling_freq;
+#endif
     usb_slist_t *i;
     uint8_t entity_id;
     uint8_t control_selector;
@@ -176,8 +180,9 @@ static int audio_class_request_handler(struct usb_setup_packet *setup, uint8_t *
     }
 
     current_feature_control = (struct usbd_audio_attribute_control *)current_entity_info->priv[0];
+#if CONFIG_USBDEV_AUDIO_VERSION >= 0x0200
     sampling_freq = (uint32_t *)current_entity_info->priv[1];
-
+#endif
     if (current_entity_info->bDescriptorSubtype == AUDIO_CONTROL_FEATURE_UNIT) {
 #if CONFIG_USBDEV_AUDIO_VERSION < 0x0200
         float volume2db = 0.0;
@@ -443,11 +448,15 @@ void usbd_audio_add_entity(uint8_t entity_id, uint16_t bDescriptorSubtype)
 #endif
         entity_info->priv[0] = control;
     } else if (bDescriptorSubtype == AUDIO_CONTROL_CLOCK_SOURCE) {
+#if CONFIG_USBDEV_AUDIO_VERSION >= 0x0200
         uint32_t *sampling_freq = usb_malloc(sizeof(uint32_t) * CONFIG_USBDEV_AUDIO_MAX_CHANNEL);
         for (size_t ch = 0; ch < CONFIG_USBDEV_AUDIO_MAX_CHANNEL; ch++) {
             sampling_freq[ch] = 16000;
         }
         entity_info->priv[1] = sampling_freq;
+#else
+        entity_info->priv[1] = NULL;
+#endif
     }
 
     usb_slist_add_tail(&usbd_audio_entity_info_head, &entity_info->list);
@@ -464,12 +473,12 @@ __WEAK void usbd_audio_set_mute(uint8_t entity_id, uint8_t ch, uint8_t enable)
 __WEAK void usbd_audio_set_sampling_freq(uint8_t entity_id, uint8_t ep_ch, uint32_t sampling_freq)
 {
 }
-
+#if CONFIG_USBDEV_AUDIO_VERSION >= 0x0200
 __WEAK void usbd_audio_get_sampling_freq_table(uint8_t entity_id, uint8_t **sampling_freq_table)
 {
     *sampling_freq_table = (uint8_t *)default_sampling_freq_table;
 }
-
+#endif
 __WEAK void usbd_audio_set_pitch(uint8_t ep, bool enable)
 {
 }
diff --git a/class/cdc/usbd_cdc.c b/class/cdc/usbd_cdc.c
index b542b1c9..b540a49c 100644
--- a/class/cdc/usbd_cdc.c
+++ b/class/cdc/usbd_cdc.c
@@ -26,7 +26,6 @@
 const char *stop_name[] = { "1", "1.5", "2" };
 const char *parity_name[] = { "N", "O", "E", "M", "S" };
 
-/* Device data structure */
 struct usbd_cdc {
     struct cdc_line_coding line_coding;
     bool dtr;
@@ -48,15 +47,7 @@ static void usbd_cdc_acm_reset(void)
     g_usbd_cdc_acm_class.line_coding.bCharFormat = 0;
 }
 #endif
-/**
- * @brief Handler called for Class requests not handled by the USB stack.
- *
- * @param setup    Information about the request to execute.
- * @param len       Size of the buffer.
- * @param data      Buffer containing the request result.
- *
- * @return  0 on success, negative errno code on fail.
- */
+
 static int cdc_acm_class_request_handler(struct usb_setup_packet *setup, uint8_t **data, uint32_t *len)
 {
     USB_LOG_DBG("CDC Class request: "
diff --git a/class/dfu/usbd_dfu.c b/class/dfu/usbd_dfu.c
index 88901ffe..b5375d2b 100644
--- a/class/dfu/usbd_dfu.c
+++ b/class/dfu/usbd_dfu.c
@@ -23,7 +23,6 @@
 #include "usbd_core.h"
 #include "usbd_dfu.h"
 
-/* Device data structure */
 struct dfu_cfg_priv {
     struct dfu_info info;
 } usbd_dfu_cfg;
diff --git a/class/hid/usbd_hid.c b/class/hid/usbd_hid.c
index 9aa909a8..a7e2f839 100644
--- a/class/hid/usbd_hid.c
+++ b/class/hid/usbd_hid.c
@@ -23,9 +23,6 @@
 #include "usbd_core.h"
 #include "usbd_hid.h"
 
-#define HID_STATE_IDLE 0
-#define HID_STATE_BUSY 1
-
 struct usbd_hid {
     const uint8_t *hid_descriptor;
     const uint8_t *hid_report_descriptor;
diff --git a/class/msc/usbd_msc.c b/class/msc/usbd_msc.c
index 00dd9ee2..a2da817a 100644
--- a/class/msc/usbd_msc.c
+++ b/class/msc/usbd_msc.c
@@ -76,9 +76,6 @@ USB_NOCACHE_RAM_SECTION struct usbd_msc_cfg_priv {
     uint8_t block_buffer[CONFIG_USBDEV_MSC_BLOCK_SIZE];
 } usbd_msc_cfg;
 
-/*memory OK (after a usbd_msc_memory_verify)*/
-static bool memOK;
-
 #ifdef CONFIG_USBDEV_MSC_THREAD
 static volatile uint8_t thread_op;
 static usb_osal_sem_t msc_sem;
@@ -91,15 +88,6 @@ static void usbd_msc_reset(void)
     usbd_msc_cfg.stage = MSC_READ_CBW;
 }
 
-/**
- * @brief Handler called for Class requests not handled by the USB stack.
- *
- * @param setup    Information about the request to execute.
- * @param len       Size of the buffer.
- * @param data      Buffer containing the request result.
- *
- * @return  0 on success, negative errno code on fail.
- */
 static int msc_storage_class_request_handler(struct usb_setup_packet *setup, uint8_t **data, uint32_t *len)
 {
     USB_LOG_DBG("MSC Class request: "
@@ -640,7 +628,8 @@ static bool SCSI_write12(uint8_t **data, uint32_t *len)
     usbd_ep_start_read(mass_ep_data[MSD_OUT_EP_IDX].ep_addr, &usbd_msc_cfg.block_buffer[usbd_msc_cfg.scsi_blk_addr % usbd_msc_cfg.scsi_blk_size], MASS_STORAGE_BULK_EP_MPS);
     return true;
 }
-
+/* do not use verify to reduce code size */
+#if 0
 static bool SCSI_verify10(uint8_t **data, uint32_t *len)
 {
     /* Logical Block Address of First Block */
@@ -681,11 +670,10 @@ static bool SCSI_verify10(uint8_t **data, uint32_t *len)
         return false;
     }
 
-    memOK = true;
     usbd_msc_cfg.stage = MSC_DATA_OUT;
     return true;
 }
-
+#endif
 #ifdef CONFIG_USBDEV_MSC_THREAD
 static void usbd_msc_thread_memory_read_done(void)
 {
@@ -863,7 +851,8 @@ static bool SCSI_CBWDecode(uint32_t nbytes)
                 ret = SCSI_write12(NULL, 0);
                 break;
             case SCSI_CMD_VERIFY10:
-                ret = SCSI_verify10(NULL, 0);
+                //ret = SCSI_verify10(NULL, 0);
+                ret = false;
                 break;
 
             default:
diff --git a/class/mtp/usbd_mtp.c b/class/mtp/usbd_mtp.c
index efa00485..8a066a9a 100644
--- a/class/mtp/usbd_mtp.c
+++ b/class/mtp/usbd_mtp.c
@@ -23,7 +23,6 @@
 #include "usbd_core.h"
 #include "usbd_mtp.h"
 
-/* Device data structure */
 struct mtp_cfg_priv {
     uint8_t device_status;
 } usbd_mtp_cfg;
@@ -41,15 +40,6 @@ struct mtp_cfg_priv {
 /* Describe EndPoints configuration */
 static usbd_endpoint_t mtp_ep_data[2];
 
-/**
- * @brief Handler called for Class requests not handled by the USB stack.
- *
- * @param setup    Information about the request to execute.
- * @param len       Size of the buffer.
- * @param data      Buffer containing the request result.
- *
- * @return  0 on success, negative errno code on fail.
- */
 static int mtp_class_request_handler(struct usb_setup_packet *setup, uint8_t **data, uint32_t *len)
 {
     USB_LOG_DBG("MTP Class request: "
diff --git a/class/printer/usbd_printer.c b/class/printer/usbd_printer.c
index fae89532..c49b8018 100644
--- a/class/printer/usbd_printer.c
+++ b/class/printer/usbd_printer.c
@@ -23,21 +23,11 @@
 #include "usbd_core.h"
 #include "usbd_printer.h"
 
-/* Device data structure */
 struct printer_cfg_priv {
     uint8_t *device_id;
     uint8_t port_status;
 } usbd_printer_cfg;
 
-/**
- * @brief Handler called for Class requests not handled by the USB stack.
- *
- * @param setup    Information about the request to execute.
- * @param len       Size of the buffer.
- * @param data      Buffer containing the request result.
- *
- * @return  0 on success, negative errno code on fail.
- */
 static int printer_class_request_handler(struct usb_setup_packet *setup, uint8_t **data, uint32_t *len)
 {
     USB_LOG_DBG("Printer Class request: "
diff --git a/common/usb_dc.h b/common/usb_dc.h
index 0910283a..4caf8705 100644
--- a/common/usb_dc.h
+++ b/common/usb_dc.h
@@ -35,35 +35,20 @@ extern "C" {
  * Structure containing the USB endpoint configuration.
  */
 struct usbd_endpoint_cfg {
-    /** The number associated with the EP in the device
-     *  configuration structure
-     *       IN  EP = 0x80 | \<endpoint number\>
-     *       OUT EP = 0x00 | \<endpoint number\>
-     */
-    uint8_t ep_addr;
-    /** Endpoint Transfer Type.
-     * May be Bulk, Interrupt, Control or Isochronous
-     */
-    uint8_t ep_type;
-    /** Endpoint max packet size */
-    uint16_t ep_mps;
+    uint8_t ep_addr; /* Endpoint addr with direction */
+    uint8_t ep_type; /* Endpoint type */
+    uint16_t ep_mps; /* Endpoint max packet size */
 };
 
 /**
- * @brief USB Device Core Layer API
- * @defgroup _usb_device_core_api USB Device Core API
- * @{
- */
-
-/**
  * @brief init device controller registers.
- * @return 0 on success, negative errno code on fail.
+ * @return On success will return 0, and others indicate fail.
  */
 int usb_dc_init(void);
 
 /**
  * @brief deinit device controller registers.
- * @return 0 on success, negative errno code on fail.
+ * @return On success will return 0, and others indicate fail.
  */
 int usb_dc_deinit(void);
 
@@ -72,43 +57,35 @@ int usb_dc_deinit(void);
  *
  * @param[in] addr Device address
  *
- * @return 0 on success, negative errno code on fail.
+ * @return On success will return 0, and others indicate fail.
  */
 int usbd_set_address(const uint8_t addr);
 
 /**
  * @brief configure and enable endpoint.
  *
- * This function sets endpoint configuration according to one specified in USB.
- * endpoint descriptor and then enables it for data transfers.
- *
- * @param [in]  ep_desc Endpoint descriptor byte array.
+ * @param [in]  ep_cfg Endpoint config.
  *
- * @return true if successfully configured and enabled.
+ * @return On success will return 0, and others indicate fail.
  */
 int usbd_ep_open(const struct usbd_endpoint_cfg *ep_cfg);
 
 /**
  * @brief Disable the selected endpoint
  *
- * Function to disable the selected endpoint. Upon success interrupts are
- * disabled for the corresponding endpoint and the endpoint is no longer able
- * for transmitting/receiving data.
- *
- * @param[in] ep Endpoint address corresponding to the one
- *               listed in the device configuration table
+ * @param[in] ep Endpoint address
  *
- * @return 0 on success, negative errno code on fail.
+ * @return On success will return 0, and others indicate fail.
  */
 int usbd_ep_close(const uint8_t ep);
 
 /**
  * @brief Set stall condition for the selected endpoint
  *
- * @param[in] ep Endpoint address corresponding to the one
- *               listed in the device configuration table
+ * @param[in] ep Endpoint address
  *
- * @return 0 on success, negative errno code on fail.
+ *
+ * @return On success will return 0, and others indicate fail.
  */
 int usbd_ep_set_stall(const uint8_t ep);
 
@@ -118,18 +95,18 @@ int usbd_ep_set_stall(const uint8_t ep);
  * @param[in] ep Endpoint address corresponding to the one
  *               listed in the device configuration table
  *
- * @return 0 on success, negative errno code on fail.
+ * @return On success will return 0, and others indicate fail.
  */
 int usbd_ep_clear_stall(const uint8_t ep);
 
 /**
  * @brief Check if the selected endpoint is stalled
  *
- * @param[in]  ep       Endpoint address corresponding to the one
- *                      listed in the device configuration table
+ * @param[in]  ep       Endpoint address
+ *
  * @param[out] stalled  Endpoint stall status
  *
- * @return 0 on success, negative errno code on fail.
+ * @return On success will return 0, and others indicate fail.
  */
 int usbd_ep_is_stalled(const uint8_t ep, uint8_t *stalled);
 
diff --git a/common/usb_def.h b/common/usb_def.h
index 043eadaa..c4042733 100644
--- a/common/usb_def.h
+++ b/common/usb_def.h
@@ -46,7 +46,7 @@
 /**< maximum packet size (MPS) for EP 0 */
 #define USB_CTRL_EP_MPS 64
 
-// USB PID Types
+/* USB PID Types */
 #define USB_PID_OUT   (0x01) /* Tokens */
 #define USB_PID_IN    (0x09)
 #define USB_PID_SOF   (0x05)
diff --git a/common/usb_hc.h b/common/usb_hc.h
index 78575388..5896387d 100644
--- a/common/usb_hc.h
+++ b/common/usb_hc.h
@@ -31,6 +31,7 @@ extern "C" {
 
 typedef void (*usbh_asynch_callback_t)(void *arg, int nbytes);
 typedef void *usbh_epinfo_t;
+
 /**
  * @brief USB Endpoint Configuration.
  *
@@ -38,38 +39,24 @@ typedef void *usbh_epinfo_t;
  */
 struct usbh_endpoint_cfg {
     struct usbh_hubport *hport;
-    /** The number associated with the EP in the device
-     *  configuration structure
-     *       IN  EP = 0x80 | \<endpoint number\>
-     *       OUT EP = 0x00 | \<endpoint number\>
-     */
-    uint8_t ep_addr;
-    /** Endpoint Transfer Type.
-     * May be Bulk, Interrupt, Control or Isochronous
-     */
-    uint8_t ep_type;
-    uint8_t ep_interval;
-    /** Endpoint max packet size */
-    uint16_t ep_mps;
+    uint8_t ep_addr;     /* Endpoint addr with direction */
+    uint8_t ep_type;     /* Endpoint type */
+    uint16_t ep_mps;     /* Endpoint max packet size */
+    uint8_t ep_interval; /* Endpoint interval */
+    uint16_t ep_mps;     /* Endpoint max packet size */
 };
 
 /**
- * @brief USB Host Core Layer API
- * @defgroup _usb_host_core_api USB Host Core API
- * @{
- */
-
-/**
  * @brief usb host software init, used for global reset.
  *
- * @return int
+ * @return On success will return 0, and others indicate fail.
  */
 int usb_hc_sw_init(void);
 
 /**
  * @brief usb host controller hardware init.
  *
- * @return int
+ * @return On success will return 0, and others indicate fail.
  */
 int usb_hc_hw_init(void);
 
@@ -77,8 +64,7 @@ int usb_hc_hw_init(void);
  * @brief get port connect status
  *
  * @param port
- * @return true
- * @return false
+ * @return On success will return 0, and others indicate fail.
  */
 bool usbh_get_port_connect_status(const uint8_t port);
 
@@ -86,7 +72,7 @@ bool usbh_get_port_connect_status(const uint8_t port);
  * @brief reset roothub port
  *
  * @param port port index
- * @return int
+ * @return On success will return 0, and others indicate fail.
  */
 int usbh_reset_port(const uint8_t port);
 
diff --git a/common/usb_util.h b/common/usb_util.h
index 4a7fbb83..cef8915a 100644
--- a/common/usb_util.h
+++ b/common/usb_util.h
@@ -138,23 +138,11 @@
 #define HI_BYTE(x) ((uint8_t)((x & 0xFF00) >> 8))
 #endif
 
-/**
- * @def MAX
- * @brief The larger value between @p a and @p b.
- * @note Arguments are evaluated twice.
- */
 #ifndef MAX
-/* Use Z_MAX for a GCC-only, single evaluation version */
 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
 #endif
 
-/**
- * @def MIN
- * @brief The smaller value between @p a and @p b.
- * @note Arguments are evaluated twice.
- */
 #ifndef MIN
-/* Use Z_MIN for a GCC-only, single evaluation version */
 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
 #endif
 
@@ -208,13 +196,6 @@
         (field)[3] = (uint8_t)((value) >> 0);  \
     } while (0)
 
-#define REQTYPE_GET_DIR(x)   (((x) >> 7) & 0x01)
-#define REQTYPE_GET_TYPE(x)  (((x) >> 5) & 0x03U)
-#define REQTYPE_GET_RECIP(x) ((x)&0x1F)
-
-#define GET_DESC_TYPE(x)  (((x) >> 8) & 0xFFU)
-#define GET_DESC_INDEX(x) ((x)&0xFFU)
-
 #define WBVAL(x) (x & 0xFF), ((x >> 8) & 0xFF)
 #define DBVAL(x) (x & 0xFF), ((x >> 8) & 0xFF), ((x >> 16) & 0xFF), ((x >> 24) & 0xFF)
 
@@ -239,6 +220,4 @@
         19, 18, 17, 16, 15, 14, 13, 12, 11, 10, \
         9, 8, 7, 6, 5, 4, 3, 2, 1, 0
 
-#define USB_DESC_SECTION __attribute__((section("usb_desc"))) __USED __ALIGNED(1)
-
 #endif
diff --git a/core/usbd_core.c b/core/usbd_core.c
index 16794f55..418f2ad5 100644
--- a/core/usbd_core.c
+++ b/core/usbd_core.c
@@ -61,8 +61,6 @@ USB_NOCACHE_RAM_SECTION struct usbd_core_cfg_priv {
     bool configured;
     /** Currently selected configuration */
     uint8_t configuration;
-    /** Remote wakeup feature status */
-    uint16_t remote_wakeup;
 } usbd_core_cfg;
 
 static usb_slist_t usbd_class_head = USB_SLIST_OBJECT_INIT(usbd_class_head);
@@ -70,17 +68,8 @@ static struct usb_msosv1_descriptor *msosv1_desc;
 static struct usb_msosv2_descriptor *msosv2_desc;
 static struct usb_bos_descriptor *bos_desc;
 
-#ifdef CONFIG_USBDEV_TEST_MODE
-void usbd_set_feature(uint16_t index, uint16_t value);
-void usbd_clear_feature(uint16_t index, uint16_t value);
-#endif
 static void usbd_class_event_notify_handler(uint8_t event, void *arg);
-/**
- * @brief print the contents of a setup packet
- *
- * @param [in] setup The setup packet
- *
- */
+
 static void usbd_print_setup(struct usb_setup_packet *setup)
 {
     USB_LOG_INFO("Setup: "
@@ -92,65 +81,10 @@ static void usbd_print_setup(struct usb_setup_packet *setup)
                  setup->wLength);
 }
 
-/**
- * @brief Check if the device is in Configured state
- *
- * @return true if Configured, false otherwise.
- */
 static bool is_device_configured(void)
 {
     return (usbd_core_cfg.configuration != 0);
 }
-/**
- * @brief Check if the interface of given number is valid
- *
- * @param [in] interface Number of the addressed interface
- *
- * This function searches through descriptor and checks
- * is the Host has addressed valid interface.
- *
- * @return true if interface exists - valid
- */
-static bool is_interface_valid(uint8_t interface)
-{
-    const uint8_t *p = (uint8_t *)usbd_core_cfg.descriptors;
-    const struct usb_configuration_descriptor *cfg_descr;
-
-    /* Search through descriptor for matching interface */
-    while (p[DESC_bLength] != 0U) {
-        if (p[DESC_bDescriptorType] == USB_DESCRIPTOR_TYPE_CONFIGURATION) {
-            cfg_descr = (const struct usb_configuration_descriptor *)p;
-
-            if (interface < cfg_descr->bNumInterfaces) {
-                return true;
-            }
-        }
-
-        p += p[DESC_bLength];
-    }
-
-    return false;
-}
-/**
- * @brief Check if the endpoint of given address is valid
- *
- * @param [in] ep Address of the Endpoint
- *
- * This function checks if the Endpoint of given address
- * is valid for the configured device. Valid Endpoint is
- * either Control Endpoint or one used by the device.
- *
- * @return true if endpoint exists - valid
- */
-// static bool is_ep_valid(uint8_t ep)
-// {
-//     /* Check if its Endpoint 0 */
-//     if ((ep & 0x7f) == 0) {
-//         return true;
-//     }
-
-//     return true;
-// }
 
 /**
  * @brief configure and enable endpoint
@@ -219,8 +153,8 @@ static bool usbd_get_descriptor(uint16_t type_index, uint8_t **data, uint32_t *l
     uint32_t cur_index = 0U;
     bool found = false;
 
-    type = GET_DESC_TYPE(type_index);
-    index = GET_DESC_INDEX(type_index);
+    type = HI_BYTE(type_index);
+    index = LO_BYTE(type_index);
 
     if ((type == USB_DESCRIPTOR_TYPE_STRING) && (index == USB_OSDESC_STRING_DESC_INDEX)) {
         USB_LOG_INFO("read MS OS 2.0 descriptor string\r\n");
@@ -276,14 +210,12 @@ static bool usbd_get_descriptor(uint16_t type_index, uint8_t **data, uint32_t *l
     }
 
     if (found) {
-        /* set data pointer */
+        /* found descriptor, save descriptor premiere address */
         *data = p;
 
-        /* get length from structure */
         if ((type == USB_DESCRIPTOR_TYPE_CONFIGURATION) || ((type == USB_DESCRIPTOR_TYPE_OTHER_SPEED))) {
-            /* configuration descriptor is an
-             * exception, length is at offset
-             * 2 and 3
+            /* configuration or other speed descriptor is an
+             * exception, length is at offset 2 and 3
              */
             *len = (p[CONF_DESC_wTotalLength]) |
                    (p[CONF_DESC_wTotalLength + 1] << 8);
@@ -318,12 +250,6 @@ static bool usbd_set_configuration(uint8_t config_index, uint8_t alt_setting)
     uint8_t cur_config = 0xFF;
     bool found = false;
 
-    if (config_index == 0U) {
-        /* TODO: unconfigure device */
-        USB_LOG_ERR("Device not configured - invalid configuration\r\n");
-        return true;
-    }
-
     /* configure endpoints for this configuration/altsetting */
     while (p[DESC_bLength] != 0U) {
         switch (p[DESC_bDescriptorType]) {
@@ -436,46 +362,34 @@ static bool usbd_set_interface(uint8_t iface, uint8_t alt_setting)
 static bool usbd_std_device_req_handler(struct usb_setup_packet *setup, uint8_t **data, uint32_t *len)
 {
     uint16_t value = setup->wValue;
-#ifdef CONFIG_USBDEV_TEST_MODE
-    uint16_t index = setup->wIndex;
-#endif
     bool ret = true;
 
     switch (setup->bRequest) {
         case USB_REQUEST_GET_STATUS:
             /* bit 0: self-powered */
             /* bit 1: remote wakeup */
-            *data = (uint8_t *)&usbd_core_cfg.remote_wakeup;
-
+            (*data)[0] = 0x00;
+            (*data)[1] = 0x00;
             *len = 2;
             break;
 
         case USB_REQUEST_CLEAR_FEATURE:
-#ifdef CONFIG_USBDEV_TEST_MODE
-            /* process for feature */
-            usbd_clear_feature(index, value);
-#endif
             if (value == USB_FEATURE_REMOTE_WAKEUP) {
-                usbd_core_cfg.remote_wakeup = 0;
                 usbd_class_event_notify_handler(USBD_EVENT_CLEAR_REMOTE_WAKEUP, NULL);
             }
-
+            *len = 0;
             break;
 
         case USB_REQUEST_SET_FEATURE:
-#ifdef CONFIG_USBDEV_TEST_MODE
-            /* process for feature */
-            usbd_set_feature(index, value);
-#endif
             if (value == USB_FEATURE_REMOTE_WAKEUP) {
-                usbd_core_cfg.remote_wakeup = 1;
                 usbd_class_event_notify_handler(USBD_EVENT_SET_REMOTE_WAKEUP, NULL);
             }
-
+            *len = 0;
             break;
 
         case USB_REQUEST_SET_ADDRESS:
             usbd_set_address(value);
+            *len = 0;
             break;
 
         case USB_REQUEST_GET_DESCRIPTOR:
@@ -487,7 +401,6 @@ static bool usbd_std_device_req_handler(struct usb_setup_packet *setup, uint8_t
             break;
 
         case USB_REQUEST_GET_CONFIGURATION:
-            /* indicate if we are configured */
             *data = (uint8_t *)&usbd_core_cfg.configuration;
             *len = 1;
             break;
@@ -496,28 +409,22 @@ static bool usbd_std_device_req_handler(struct usb_setup_packet *setup, uint8_t
             value &= 0xFF;
 
             if (!usbd_set_configuration(value, 0)) {
-                USB_LOG_DBG("USB Set Configuration failed\r\n");
                 ret = false;
             } else {
-                /* configuration successful,
-                 * update current configuration
-                 */
                 usbd_core_cfg.configuration = value;
                 usbd_core_cfg.configured = true;
                 usbd_class_event_notify_handler(USBD_EVENT_CONFIGURED, NULL);
                 usbd_configure_done_callback();
             }
-
+            *len = 0;
             break;
 
         case USB_REQUEST_GET_INTERFACE:
-            break;
-
         case USB_REQUEST_SET_INTERFACE:
+            ret = false;
             break;
 
         default:
-            USB_LOG_ERR("Illegal device req 0x%02x\r\n", setup->bRequest);
             ret = false;
             break;
     }
@@ -537,48 +444,40 @@ static bool usbd_std_device_req_handler(struct usb_setup_packet *setup, uint8_t
 static bool usbd_std_interface_req_handler(struct usb_setup_packet *setup,
                                            uint8_t **data, uint32_t *len)
 {
-    /** The device must be configured to accept standard interface
-     * requests and the addressed Interface must be valid.
-     */
-    if (!is_device_configured() ||
-        (!is_interface_valid((uint8_t)setup->wIndex))) {
+    bool ret = true;
+
+    /* Only when device is configured, then interface requests can be valid. */
+    if (!is_device_configured()) {
         return false;
     }
 
     switch (setup->bRequest) {
         case USB_REQUEST_GET_STATUS:
-            /* no bits specified */
-            *data = (uint8_t *)&usbd_core_cfg.remote_wakeup;
-
+            (*data)[0] = 0x00;
+            (*data)[1] = 0x00;
             *len = 2;
             break;
 
         case USB_REQUEST_CLEAR_FEATURE:
         case USB_REQUEST_SET_FEATURE:
-            /* not defined for interface */
-            return false;
-
+            ret = false;
+            break;
         case USB_REQUEST_GET_INTERFACE:
-            /** This handler is called for classes that does not support
-             * alternate Interfaces so always return 0. Classes that
-             * support alternative interfaces handles GET_INTERFACE
-             * in custom_handler.
-             */
             (*data)[0] = 0;
-
             *len = 1;
             break;
 
         case USB_REQUEST_SET_INTERFACE:
             usbd_set_interface(setup->wIndex, setup->wValue);
+            *len = 0;
             break;
 
         default:
-            USB_LOG_ERR("Illegal interface req 0x%02x\r\n", setup->bRequest);
-            return false;
+            ret = false;
+            break;
     }
 
-    return true;
+    return ret;
 }
 
 /**
@@ -593,87 +492,56 @@ static bool usbd_std_interface_req_handler(struct usb_setup_packet *setup,
 static bool usbd_std_endpoint_req_handler(struct usb_setup_packet *setup, uint8_t **data, uint32_t *len)
 {
     uint8_t ep = (uint8_t)setup->wIndex;
+    bool ret = true;
+
+    /* Only when device is configured, then endpoint requests can be valid. */
+    if (!is_device_configured()) {
+        return false;
+    }
 
     switch (setup->bRequest) {
         case USB_REQUEST_GET_STATUS:
-
-            /** This request is valid for Control Endpoints when
-             * the device is not yet configured. For other
-             * Endpoints the device must be configured.
-             * Firstly check if addressed ep is Control Endpoint.
-             * If no then the device must be in Configured state
-             * to accept the request.
-             */
-            if (((ep & 0x7f) == 0) || is_device_configured()) {
-                /* bit 0 - Endpoint halted or not */
-                usbd_ep_is_stalled(ep, (uint8_t *)&usbd_core_cfg.remote_wakeup);
-                *data = (uint8_t *)&usbd_core_cfg.remote_wakeup;
-
-                *len = 2;
-                break;
-            }
-
-            return false;
-
+            (*data)[0] = 0x00;
+            (*data)[1] = 0x00;
+            *len = 2;
+            break;
         case USB_REQUEST_CLEAR_FEATURE:
             if (setup->wValue == USB_FEATURE_ENDPOINT_HALT) {
-                /** This request is valid for Control Endpoints when
-                 * the device is not yet configured. For other
-                 * Endpoints the device must be configured.
-                 * Firstly check if addressed ep is Control Endpoint.
-                 * If no then the device must be in Configured state
-                 * to accept the request.
-                 */
-                if (((ep & 0x7f) == 0) || is_device_configured()) {
-                    USB_LOG_ERR("ep:%x clear halt\r\n", ep);
+                USB_LOG_ERR("ep:%02x clear halt\r\n", ep);
 
-                    usbd_ep_clear_stall(ep);
-                    usbd_class_event_notify_handler(USBD_EVENT_CLEAR_HALT, NULL);
-                    break;
-                }
+                usbd_ep_clear_stall(ep);
+                usbd_class_event_notify_handler(USBD_EVENT_CLEAR_HALT, NULL);
+                break;
+            } else {
+                ret = false;
             }
-
-            /* only ENDPOINT_HALT defined for endpoints */
-            return false;
-
+            *len = 0;
+            break;
         case USB_REQUEST_SET_FEATURE:
             if (setup->wValue == USB_FEATURE_ENDPOINT_HALT) {
-                /** This request is valid for Control Endpoints when
-                 * the device is not yet configured. For other
-                 * Endpoints the device must be configured.
-                 * Firstly check if addressed ep is Control Endpoint.
-                 * If no then the device must be in Configured state
-                 * to accept the request.
-                 */
-                if (((ep & 0x7f) == 0) || is_device_configured()) {
-                    /* set HALT by stalling */
-                    USB_LOG_ERR("ep:%x set halt\r\n", ep);
+                USB_LOG_ERR("ep:%02x set halt\r\n", ep);
 
-                    usbd_ep_set_stall(ep);
-                    usbd_class_event_notify_handler(USBD_EVENT_SET_HALT, NULL);
-                    break;
-                }
+                usbd_ep_set_stall(ep);
+                usbd_class_event_notify_handler(USBD_EVENT_SET_HALT, NULL);
+            } else {
+                ret = false;
             }
-
-            /* only ENDPOINT_HALT defined for endpoints */
-            return false;
+            *len = 0;
+            break;
 
         case USB_REQUEST_SYNCH_FRAME:
-
-            return false;
-
+            ret = false;
+            break;
         default:
-            USB_LOG_ERR("Illegal ep req 0x%02x\r\n", setup->bRequest);
-            return false;
+            ret = false;
+            break;
     }
 
-    return true;
+    return ret;
 }
 
 /**
- * @brief default handler for standard ('chapter 9') requests
- *
- * If a custom request handler was installed, this handler is called first.
+ * @brief handle standard requests (list in chapter 9)
  *
  * @param [in]     setup    The setup packet
  * @param [in,out] data     Data buffer
@@ -709,6 +577,7 @@ static int usbd_standard_request_handler(struct usb_setup_packet *setup, uint8_t
 
         default:
             rc = -1;
+            break;
     }
 
     return rc;
@@ -727,7 +596,6 @@ static int usbd_standard_request_handler(struct usb_setup_packet *setup, uint8_t
  */
 static int usbd_class_request_handler(struct usb_setup_packet *setup, uint8_t **data, uint32_t *len)
 {
-    USB_LOG_DBG("bRequest 0x%02x, wIndex 0x%04x\r\n", setup->bRequest, setup->wIndex);
     usb_slist_t *i, *j;
     if ((setup->bmRequestType & USB_REQUEST_RECIPIENT_MASK) == USB_REQUEST_RECIPIENT_INTERFACE) {
         usb_slist_for_each(i, &usbd_class_head)
@@ -774,13 +642,6 @@ static int usbd_class_request_handler(struct usb_setup_packet *setup, uint8_t **
  */
 static int usbd_vendor_request_handler(struct usb_setup_packet *setup, uint8_t **data, uint32_t *len)
 {
-    USB_LOG_DBG("bRequest 0x%02x, wValue0x%04x, wIndex 0x%04x\r\n", setup->bRequest, setup->wValue, setup->wIndex);
-
-    // if((setup->bmRequestType & USB_REQUEST_RECIPIENT_MASK) != USB_REQUEST_RECIPIENT_DEVICE)
-    // {
-    //     return -1;
-    // }
-
     if (msosv1_desc) {
         if (setup->bRequest == msosv1_desc->vendor_code) {
             switch (setup->wIndex) {
@@ -836,9 +697,7 @@ static int usbd_vendor_request_handler(struct usb_setup_packet *setup, uint8_t *
 }
 
 /**
- * @brief handler for special requests
- *
- * If a custom request handler was installed, this handler is called first.
+ * @brief handler for special requests (for hid report or audio ep request, later will be removed)
  *
  * @param [in]     setup    The setup packet
  * @param [in,out] data     Data buffer
@@ -848,8 +707,6 @@ static int usbd_vendor_request_handler(struct usb_setup_packet *setup, uint8_t *
  */
 static int usbd_custom_request_handler(struct usb_setup_packet *setup, uint8_t **data, uint32_t *len)
 {
-    USB_LOG_DBG("bRequest 0x%02x, wIndex 0x%04x\r\n", setup->bRequest, setup->wIndex);
-
     if ((setup->bmRequestType & USB_REQUEST_RECIPIENT_MASK) != USB_REQUEST_RECIPIENT_INTERFACE) {
         return -1;
     }
@@ -873,12 +730,7 @@ static int usbd_custom_request_handler(struct usb_setup_packet *setup, uint8_t *
 }
 
 /**
- * @brief handle a request by calling one of the installed request handlers
- *
- * Local function to handle a request by calling one of the installed request
- * handlers. In case of data going from host to device, the data is at *ppbData.
- * In case of data going from device to host, the handler can either choose to
- * write its data at *ppbData or update the data pointer.
+ * @brief handle setup request( standard/class/vendor/other)
  *
  * @param [in]     setup The setup packet
  * @param [in,out] data  Data buffer
@@ -993,7 +845,7 @@ void usbd_event_ep0_setup_complete_handler(uint8_t *psetup)
     usbd_core_cfg.ep0_data_buf_len = setup->wLength;
     usbd_core_cfg.zlp_flag = false;
 
-    /* this maybe set code in class request code  */
+    /* handle class request when all the data is received */
     if (setup->wLength && ((setup->bmRequestType & USB_REQUEST_DIR_MASK) == USB_REQUEST_DIR_OUT)) {
         USB_LOG_DBG("Start reading %d bytes from ep0\r\n", setup->wLength);
         usbd_ep_start_read(USB_CONTROL_OUT_EP0, usbd_core_cfg.ep0_data_buf, setup->wLength);
@@ -1162,14 +1014,4 @@ int usbd_initialize(void)
 {
     usb_dc_init();
     return 0;
-}
-
-#ifdef CONFIG_USBDEV_TEST_MODE
-__WEAK void usbd_set_feature(uint16_t index, uint16_t value)
-{
-}
-
-__WEAK void usbd_clear_feature(uint16_t index, uint16_t value)
-{
-}
-#endif
+}
\ No newline at end of file
diff --git a/core/usbd_core.h b/core/usbd_core.h
index 1243c663..aecb59be 100644
--- a/core/usbd_core.h
+++ b/core/usbd_core.h
@@ -82,26 +82,8 @@ enum usbd_event_type {
     USBD_EVENT_UNKNOWN
 };
 
-/**
- * @brief Callback function signature for the USB Endpoint status
- */
+typedef int (*usbd_request_handler)(struct usb_setup_packet *setup, uint8_t **data, uint32_t *len);
 typedef void (*usbd_endpoint_callback)(uint8_t ep, uint32_t nbytes);
-
-/**
- * @brief Callback function signature for class specific requests
- *
- * Function which handles Class specific requests corresponding to an
- * interface number specified in the device descriptor table. For host
- * to device direction the 'len' and 'payload_data' contain the length
- * of the received data and the pointer to the received data respectively.
- * For device to host class requests, 'len' and 'payload_data' should be
- * set by the callback function with the length and the address of the
- * data to be transmitted buffer respectively.
- */
-typedef int (*usbd_request_handler)(struct usb_setup_packet *setup,
-                                    uint8_t **data, uint32_t *len);
-
-/* callback function pointer structure for Application to handle events */
 typedef void (*usbd_notify_handler)(uint8_t event, void *arg);
 
 typedef struct usbd_endpoint {
diff --git a/core/usbh_core.c b/core/usbh_core.c
index 610933c6..719cc1d2 100644
--- a/core/usbh_core.c
+++ b/core/usbh_core.c
@@ -50,8 +50,8 @@ struct usbh_devaddr_priv {
 };
 
 struct usbh_roothubport_priv {
-    struct usbh_hubport hport;       /* Common hub port definitions */
-    struct usbh_devaddr_priv devgen; /* Address generation data */
+    struct usbh_hubport hport;
+    struct usbh_devaddr_priv devgen;
 };
 
 struct usbh_core_priv {
@@ -75,11 +75,7 @@ static int usbh_allocate_devaddr(struct usbh_devaddr_priv *devgen)
     int index;
     int bitno;
 
-    /* Loop until we find a valid device address */
-
     for (;;) {
-        /* Try the next device address */
-
         devaddr = devgen->next;
         if (devgen->next >= 0x7f) {
             devgen->next = 1;
@@ -87,24 +83,14 @@ static int usbh_allocate_devaddr(struct usbh_devaddr_priv *devgen)
             devgen->next++;
         }
 
-        /* Is this address already allocated? */
-
         index = devaddr >> 5;
         bitno = devaddr & 0x1f;
         if ((devgen->alloctab[index] & (1 << bitno)) == 0) {
-            /* No... allocate it now */
-
             devgen->alloctab[index] |= (1 << bitno);
             return (int)devaddr;
         }
 
-        /* This address has already been allocated.  The following logic will
-       * prevent (unexpected) infinite loops.
-       */
-
         if (startaddr == devaddr) {
-            /* We are back where we started... the are no free device address */
-
             return -ENOMEM;
         }
     }
@@ -119,13 +105,12 @@ static int usbh_free_devaddr(struct usbh_devaddr_priv *devgen, uint8_t devaddr)
         index = devaddr >> USB_DEV_ADDR_MARK_OFFSET;
         bitno = devaddr & USB_DEV_ADDR_MARK_MASK;
 
-        /* Free the address by clearing the associated bit in the alloctab[]; */
+        /* Free the address  */
         if ((devgen->alloctab[index] |= (1 << bitno)) != 0) {
             devgen->alloctab[index] &= ~(1 << bitno);
         } else {
             return -1;
         }
-        /* Reset the next pointer if the one just released has a lower value */
 
         if (devaddr < devgen->next) {
             devgen->next = devaddr;
@@ -463,7 +448,7 @@ static int usbh_enumerate(struct usbh_hubport *hport)
         ep_mps = 64;
         descsize = USB_SIZEOF_DEVICE_DESC;
     } else {
-        /* Eight will work for both low- and full-speed */
+        /* For low or full, we use 8 bytes, 64 bytes is also ok */
         ep_mps = 8;
         descsize = 8;
     }
@@ -516,7 +501,7 @@ static int usbh_enumerate(struct usbh_hubport *hport)
         goto errout;
     }
 
-    /* wait device address set completely */
+    /* Wait device set address completely */
     usb_osal_msleep(2);
 
     /* Assign the function address to the port */
diff --git a/port/dwc2/usb_hc_dwc2.c b/port/dwc2/usb_hc_dwc2.c
index 53fea5c8..19250969 100644
--- a/port/dwc2/usb_hc_dwc2.c
+++ b/port/dwc2/usb_hc_dwc2.c
@@ -30,12 +30,6 @@
 #define USB_OTG_HC(i)   ((USB_OTG_HostChannelTypeDef *)(USB_BASE + USB_OTG_HOST_CHANNEL_BASE + ((i)*USB_OTG_HOST_CHANNEL_SIZE)))
 #define USB_OTG_FIFO(i) *(__IO uint32_t *)(USB_BASE + USB_OTG_FIFO_BASE + ((i)*USB_OTG_FIFO_SIZE))
 
-/* This structure retains the state of one host channel.  NOTE: Since there
- * is only one channel operation active at a time, some of the fields in
- * in the structure could be moved in struct stm32_ubhost_s to achieve
- * some memory savings.
- */
-
 struct dwc2_pipe {
     uint8_t ep_addr;
     uint8_t ep_type;
@@ -46,8 +40,8 @@ struct dwc2_pipe {
     uint8_t chidx;
     bool inuse;               /* True: This channel is "in use" */
     uint8_t ep_interval;      /* Interrupt/isochronous EP polling interval */
-    uint16_t num_packets;     /* for HCTSIZx*/
-    uint32_t xferlen;         /* for HCTSIZx*/
+    uint16_t num_packets;     /* for HCTSIZx */
+    uint32_t xferlen;         /* for HCTSIZx */
     uint8_t *buffer;          /* for dcache invalidate */
     volatile int result;      /* The result of the transfer */
     volatile uint32_t xfrd;   /* Bytes transferred (at end of transfer) */
@@ -358,65 +352,25 @@ static inline uint32_t dwc2_get_current_frame(void)
     return (USB_OTG_HOST->HFNUM & USB_OTG_HFNUM_FRNUM);
 }
 
-/****************************************************************************
- * Name: dwc2_pipe_alloc
- *
- * Description:
- *   Allocate a channel.
- *
- ****************************************************************************/
-
 static int dwc2_pipe_alloc(void)
 {
     int chidx;
 
-    /* Search the table of channels */
-
     for (chidx = 0; chidx < CONFIG_USB_DWC2_PIPE_NUM; chidx++) {
-        /* Is this channel available? */
         if (!g_dwc2_hcd.chan[chidx].inuse) {
-            /* Yes... make it "in use" and return the index */
-
             g_dwc2_hcd.chan[chidx].inuse = true;
             return chidx;
         }
     }
 
-    /* All of the channels are "in-use" */
-
     return -EBUSY;
 }
 
-/****************************************************************************
- * Name: dwc2_pipe_free
- *
- * Description:
- *   Free a previoiusly allocated channel.
- *
- ****************************************************************************/
-
 static void dwc2_pipe_free(struct dwc2_pipe *chan)
 {
-    /* Mark the channel available */
-
     chan->inuse = false;
 }
 
-/****************************************************************************
- * Name: dwc2_pipe_waitsetup
- *
- * Description:
- *   Set the request for the transfer complete event well BEFORE enabling
- *   the transfer (as soon as we are absolutely committed to the transfer).
- *   We do this to minimize race conditions.  This logic would have to be
- *   expanded if we want to have more than one packet in flight at a time!
- *
- * Assumptions:
- *   Called from a normal thread context BEFORE the transfer has been
- *   started.
- *
- ****************************************************************************/
-
 static int dwc2_pipe_waitsetup(struct dwc2_pipe *chan)
 {
     size_t flags;
@@ -424,13 +378,7 @@ static int dwc2_pipe_waitsetup(struct dwc2_pipe *chan)
 
     flags = usb_osal_enter_critical_section();
 
-    /* Is the device still connected? */
-
     if (usbh_get_port_connect_status(1)) {
-        /* Yes.. then set waiter to indicate that we expect to be informed
-       * when either (1) the device is disconnected, or (2) the transfer
-       * completed.
-       */
         chan->waiter = true;
         chan->result = -EBUSY;
         chan->xfrd = 0;
@@ -444,21 +392,6 @@ static int dwc2_pipe_waitsetup(struct dwc2_pipe *chan)
     return ret;
 }
 
-/****************************************************************************
- * Name: dwc2_pipe_asynchsetup
- *
- * Description:
- *   Set the request for the transfer complete event well BEFORE enabling
- *   the transfer (as soon as we are absolutely committed to the to avoid
- *   transfer).  We do this to minimize race conditions.  This logic would
- *   have to be expanded if we want to have more than one packet in flight
- *   at a time!
- *
- * Assumptions:
- *   Might be called from the level of an interrupt handler
- *
- ****************************************************************************/
-
 #ifdef CONFIG_USBHOST_ASYNCH
 static int dwc2_pipe_asynchsetup(struct dwc2_pipe *chan, usbh_asynch_callback_t callback, void *arg)
 {
@@ -466,14 +399,8 @@ static int dwc2_pipe_asynchsetup(struct dwc2_pipe *chan, usbh_asynch_callback_t
     int ret = -ENODEV;
 
     flags = usb_osal_enter_critical_section();
-    /* Is the device still connected? */
 
     if (usbh_get_port_connect_status(1)) {
-        /* Yes.. then set waiter to indicate that we expect to be informed
-       * when either (1) the device is disconnected, or (2) the transfer
-       * completed.
-       */
-
         chan->waiter = false;
         chan->result = -EBUSY;
         chan->xfrd = 0;
@@ -488,27 +415,11 @@ static int dwc2_pipe_asynchsetup(struct dwc2_pipe *chan, usbh_asynch_callback_t
 }
 #endif
 
-/****************************************************************************
- * Name: dwc2_pipe_wait
- *
- * Description:
- *   Wait for a transfer on a channel to complete.
- *
- * Assumptions:
- *   Called from a normal thread context
- *
- ****************************************************************************/
-
 static int dwc2_pipe_wait(struct dwc2_pipe *chan, uint32_t timeout)
 {
     int ret;
 
-    /* Loop, testing for an end of transfer condition.  The channel 'result'
-   * was set to EBUSY and 'waiter' was set to true before the transfer;
-   * 'waiter' will be set to false and 'result' will be set appropriately
-   * when the transfer is completed.
-   */
-
+    /* wait until timeout or sem give */
     if (chan->waiter) {
         ret = usb_osal_sem_take(chan->waitsem, timeout);
         if (ret < 0) {
@@ -516,66 +427,43 @@ static int dwc2_pipe_wait(struct dwc2_pipe *chan, uint32_t timeout)
         }
     }
 
-    /* The transfer is complete re-enable interrupts and return the result */
+    /* Sem give, check if giving from error isr */
     ret = chan->result;
-
     if (ret < 0) {
         return ret;
     }
     return chan->xfrd;
 }
 
-/****************************************************************************
- * Name: dwc2_pipe_wakeup
- *
- * Description:
- *   A channel transfer has completed... wakeup any threads waiting for the
- *   transfer to complete.
- *
- * Assumptions:
- *   This function is called from the transfer complete interrupt handler for
- *   the channel.  Interrupts are disabled.
- *
- ****************************************************************************/
-
 static void dwc2_pipe_wakeup(struct dwc2_pipe *chan)
 {
     usbh_asynch_callback_t callback;
     void *arg;
     int nbytes;
 
-    /* Is the transfer complete? */
-
-    if (chan->result != -EBUSY) {
-        /* Is there a thread waiting for this transfer to complete? */
-
-        if (chan->waiter) {
-            /* Wake'em up! */
-            chan->waiter = false;
-            usb_osal_sem_give(chan->waitsem);
-        }
+    if (chan->waiter) {
+        chan->waiter = false;
+        usb_osal_sem_give(chan->waitsem);
+    }
 #ifdef CONFIG_USBHOST_ASYNCH
-        /* No.. is an asynchronous callback expected when the transfer
-       * completes?
-       */
-        else if (chan->callback) {
-            callback = chan->callback;
-            arg = chan->arg;
-            nbytes = chan->xfrd;
-            chan->callback = NULL;
-            chan->arg = NULL;
-            if (chan->result < 0) {
-                nbytes = chan->result;
-            }
+    else if (chan->callback) {
+        callback = chan->callback;
+        arg = chan->arg;
+        nbytes = chan->xfrd;
+        chan->callback = NULL;
+        chan->arg = NULL;
+        if (chan->result < 0) {
+            nbytes = chan->result;
+        }
 #ifdef CONFIG_USB_DCACHE_ENABLE
-            if (((chan->ep_addr & 0x80) == 0x80) && (nbytes > 0)) {
-                usb_dcache_invalidate((uint32_t)chan->buffer, nbytes);
-            }
-#endif
-            callback(arg, nbytes);
+        if (((chan->ep_addr & 0x80) == 0x80) && (nbytes > 0)) {
+            usb_dcache_invalidate((uint32_t)chan->buffer, nbytes);
         }
 #endif
+        callback(arg, nbytes);
     }
+
+#endif
 }
 
 __WEAK void usb_hc_low_level_init(void)
@@ -755,6 +643,7 @@ int usbh_ep_alloc(usbh_epinfo_t *ep, const struct usbh_endpoint_cfg *ep_cfg)
 
     chan = &g_dwc2_hcd.chan[chidx];
 
+    /* store variables */
     waitsem = chan->waitsem;
     exclsem = chan->exclsem;
 
@@ -775,6 +664,7 @@ int usbh_ep_alloc(usbh_epinfo_t *ep, const struct usbh_endpoint_cfg *ep_cfg)
         chan->data_pid = HC_PID_DATA0;
     }
 
+    /* restore variables */
     chan->inuse = true;
     chan->waitsem = waitsem;
     chan->exclsem = exclsem;
@@ -1076,9 +966,7 @@ int usb_ep_cancel(usbh_epinfo_t ep)
 
     flags = usb_osal_enter_critical_section();
 
-    chan->result = -ESHUTDOWN;
 #ifdef CONFIG_USBHOST_ASYNCH
-    /* Extract the callback information */
     callback = chan->callback;
     arg = chan->arg;
     chan->callback = NULL;
@@ -1087,17 +975,14 @@ int usb_ep_cancel(usbh_epinfo_t ep)
 #endif
     usb_osal_leave_critical_section(flags);
 
-    /* Is there a thread waiting for this transfer to complete? */
-
+    /* Check if there is a thread waiting for this transfer to complete? */
     if (chan->waiter) {
-        /* Wake'em up! */
         chan->waiter = false;
         usb_osal_sem_give(chan->waitsem);
     }
 #ifdef CONFIG_USBHOST_ASYNCH
     /* No.. is an asynchronous callback expected when the transfer completes? */
     else if (callback) {
-        /* Then perform the callback */
         callback(arg, -ESHUTDOWN);
     }
 #endif
diff --git a/port/hpm/usb_hc_hpm.c b/port/hpm/usb_hc_hpm.c
index a9b9ce1b..c9b6258d 100644
--- a/port/hpm/usb_hc_hpm.c
+++ b/port/hpm/usb_hc_hpm.c
@@ -96,21 +96,6 @@ bool hcd_init(uint8_t rhport)
     return true;
 }
 
-/****************************************************************************
- * Name: hpm_ehci_pipe_waitsetup
- *
- * Description:
- *   Set the request for the transfer complete event well BEFORE enabling
- *   the transfer (as soon as we are absolutely committed to the transfer).
- *   We do this to minimize race conditions.  This logic would have to be
- *   expanded if we want to have more than one packet in flight at a time!
- *
- * Assumptions:
- *   Called from a normal thread context BEFORE the transfer has been
- *   started.
- *
- ****************************************************************************/
-
 static int hpm_ehci_pipe_waitsetup(struct hpm_ehci_pipe *chan)
 {
     size_t flags;
@@ -118,13 +103,8 @@ static int hpm_ehci_pipe_waitsetup(struct hpm_ehci_pipe *chan)
 
     flags = usb_osal_enter_critical_section();
 
-    /* Is the device still connected? */
-
     if (usbh_get_port_connect_status(1)) {
-        /* Yes.. then set waiter to indicate that we expect to be informed
-       * when either (1) the device is disconnected, or (2) the transfer
-       * completed.
-       */
+
         chan->waiter = true;
         chan->result = -EBUSY;
         chan->xfrd = 0;
@@ -138,21 +118,6 @@ static int hpm_ehci_pipe_waitsetup(struct hpm_ehci_pipe *chan)
     return ret;
 }
 
-/****************************************************************************
- * Name: hpm_ehci_pipe_asynchsetup
- *
- * Description:
- *   Set the request for the transfer complete event well BEFORE enabling
- *   the transfer (as soon as we are absolutely committed to the to avoid
- *   transfer).  We do this to minimize race conditions.  This logic would
- *   have to be expanded if we want to have more than one packet in flight
- *   at a time!
- *
- * Assumptions:
- *   Might be called from the level of an interrupt handler
- *
- ****************************************************************************/
-
 #ifdef CONFIG_USBHOST_ASYNCH
 static int hpm_ehci_pipe_asynchsetup(struct hpm_ehci_pipe *chan, usbh_asynch_callback_t callback, void *arg)
 {
@@ -160,14 +125,8 @@ static int hpm_ehci_pipe_asynchsetup(struct hpm_ehci_pipe *chan, usbh_asynch_cal
     int ret = -ENODEV;
 
     flags = usb_osal_enter_critical_section();
-    /* Is the device still connected? */
 
     if (usbh_get_port_connect_status(1)) {
-        /* Yes.. then set waiter to indicate that we expect to be informed
-       * when either (1) the device is disconnected, or (2) the transfer
-       * completed.
-       */
-
         chan->waiter = false;
         chan->result = -EBUSY;
         chan->xfrd = 0;
@@ -182,27 +141,11 @@ static int hpm_ehci_pipe_asynchsetup(struct hpm_ehci_pipe *chan, usbh_asynch_cal
 }
 #endif
 
-/****************************************************************************
- * Name: hpm_ehci_pipe_wait
- *
- * Description:
- *   Wait for a transfer on a channel to complete.
- *
- * Assumptions:
- *   Called from a normal thread context
- *
- ****************************************************************************/
-
 static int hpm_ehci_pipe_wait(struct hpm_ehci_pipe *chan, uint32_t timeout)
 {
     int ret;
 
-    /* Loop, testing for an end of transfer condition.  The channel 'result'
-   * was set to EBUSY and 'waiter' was set to true before the transfer;
-   * 'waiter' will be set to false and 'result' will be set appropriately
-   * when the transfer is completed.
-   */
-
+    /* wait until timeout or sem give */
     if (chan->waiter) {
         ret = usb_osal_sem_take(chan->waitsem, timeout);
         if (ret < 0) {
@@ -210,7 +153,7 @@ static int hpm_ehci_pipe_wait(struct hpm_ehci_pipe *chan, uint32_t timeout)
         }
     }
 
-    /* The transfer is complete re-enable interrupts and return the result */
+    /* Sem give, check if giving from error isr */
     ret = chan->result;
 
     if (ret < 0) {
@@ -219,57 +162,34 @@ static int hpm_ehci_pipe_wait(struct hpm_ehci_pipe *chan, uint32_t timeout)
     return chan->xfrd;
 }
 
-/****************************************************************************
- * Name: hpm_ehci_pipe_wakeup
- *
- * Description:
- *   A channel transfer has completed... wakeup any threads waiting for the
- *   transfer to complete.
- *
- * Assumptions:
- *   This function is called from the transfer complete interrupt handler for
- *   the channel.  Interrupts are disabled.
- *
- ****************************************************************************/
-
 static void hpm_ehci_pipe_wakeup(struct hpm_ehci_pipe *chan)
 {
     usbh_asynch_callback_t callback;
     void *arg;
     int nbytes;
 
-    /* Is the transfer complete? */
-
-    if (chan->result != -EBUSY) {
-        /* Is there a thread waiting for this transfer to complete? */
-
-        if (chan->waiter) {
-            /* Wake'em up! */
-            chan->waiter = false;
-            usb_osal_sem_give(chan->waitsem);
-        }
+    if (chan->waiter) {
+        chan->waiter = false;
+        usb_osal_sem_give(chan->waitsem);
+    }
 #ifdef CONFIG_USBHOST_ASYNCH
-        /* No.. is an asynchronous callback expected when the transfer
-       * completes?
-       */
-        else if (chan->callback) {
-            callback = chan->callback;
-            arg = chan->arg;
-            nbytes = chan->xfrd;
-            chan->callback = NULL;
-            chan->arg = NULL;
-            if (chan->result < 0) {
-                nbytes = chan->result;
-            }
+    else if (chan->callback) {
+        callback = chan->callback;
+        arg = chan->arg;
+        nbytes = chan->xfrd;
+        chan->callback = NULL;
+        chan->arg = NULL;
+        if (chan->result < 0) {
+            nbytes = chan->result;
+        }
 #ifdef CONFIG_USB_DCACHE_ENABLE
-            if (((chan->ep_addr & 0x80) == 0x80) && (nbytes > 0)) {
-                l1c_dc_invalidate((uint32_t)chan->buffer, nbytes);
-            }
-#endif
-            callback(arg, nbytes);
+        if (((chan->ep_addr & 0x80) == 0x80) && (nbytes > 0)) {
+            l1c_dc_invalidate((uint32_t)chan->buffer, nbytes);
         }
 #endif
+        callback(arg, nbytes);
     }
+#endif
 }
 
 __WEAK void usb_hc_low_level_init(void)
@@ -394,6 +314,7 @@ int usbh_ep_alloc(usbh_epinfo_t *ep, const struct usbh_endpoint_cfg *ep_cfg)
         }
     }
 
+    /* store variables */
     waitsem = chan->waitsem;
     exclsem = chan->exclsem;
 
@@ -419,7 +340,7 @@ int usbh_ep_alloc(usbh_epinfo_t *ep, const struct usbh_endpoint_cfg *ep_cfg)
 
     usb_host_edpt_open(&usb_host_handle, hport->dev_addr, &ep_desc);
 
-    /* restore variable */
+    /* restore variables */
     chan->waitsem = waitsem;
     chan->exclsem = exclsem;
 
diff --git a/port/musb/usb_hc_musb.c b/port/musb/usb_hc_musb.c
index 1c24a0c0..99cf5cf7 100644
--- a/port/musb/usb_hc_musb.c
+++ b/port/musb/usb_hc_musb.c
@@ -262,21 +262,6 @@ static void musb_read_packet(uint8_t ep_idx, uint8_t *buffer, uint16_t len)
     }
 }
 
-/****************************************************************************
- * Name: musb_pipe_waitsetup
- *
- * Description:
- *   Set the request for the transfer complete event well BEFORE enabling
- *   the transfer (as soon as we are absolutely committed to the transfer).
- *   We do this to minimize race conditions.  This logic would have to be
- *   expanded if we want to have more than one packet in flight at a time!
- *
- * Assumptions:
- *   Called from a normal thread context BEFORE the transfer has been
- *   started.
- *
- ****************************************************************************/
-
 static int musb_pipe_waitsetup(struct musb_pipe *chan)
 {
     size_t flags;
@@ -284,13 +269,7 @@ static int musb_pipe_waitsetup(struct musb_pipe *chan)
 
     flags = usb_osal_enter_critical_section();
 
-    /* Is the device still connected? */
-
     if (usbh_get_port_connect_status(0)) {
-        /* Yes.. then set waiter to indicate that we expect to be informed
-       * when either (1) the device is disconnected, or (2) the transfer
-       * completed.
-       */
         chan->waiter = true;
         chan->enable = true;
         chan->result = -EBUSY;
@@ -305,21 +284,6 @@ static int musb_pipe_waitsetup(struct musb_pipe *chan)
     return ret;
 }
 
-/****************************************************************************
- * Name: musb_pipe_asynchsetup
- *
- * Description:
- *   Set the request for the transfer complete event well BEFORE enabling
- *   the transfer (as soon as we are absolutely committed to the to avoid
- *   transfer).  We do this to minimize race conditions.  This logic would
- *   have to be expanded if we want to have more than one packet in flight
- *   at a time!
- *
- * Assumptions:
- *   Might be called from the level of an interrupt handler
- *
- ****************************************************************************/
-
 #ifdef CONFIG_USBHOST_ASYNCH
 static int musb_pipe_asynchsetup(struct musb_pipe *chan, usbh_asynch_callback_t callback, void *arg)
 {
@@ -327,13 +291,8 @@ static int musb_pipe_asynchsetup(struct musb_pipe *chan, usbh_asynch_callback_t
     int ret = -ENODEV;
 
     flags = usb_osal_enter_critical_section();
-    /* Is the device still connected? */
 
     if (usbh_get_port_connect_status(0)) {
-        /* Yes.. then set waiter to indicate that we expect to be informed
-       * when either (1) the device is disconnected, or (2) the transfer
-       * completed.
-       */
         chan->waiter = false;
         chan->enable = true;
         chan->result = -EBUSY;
@@ -348,27 +307,11 @@ static int musb_pipe_asynchsetup(struct musb_pipe *chan, usbh_asynch_callback_t
 }
 #endif
 
-/****************************************************************************
- * Name: musb_pipe_wait
- *
- * Description:
- *   Wait for a transfer on a channel to complete.
- *
- * Assumptions:
- *   Called from a normal thread context
- *
- ****************************************************************************/
-
 static int musb_pipe_wait(struct musb_pipe *chan, uint32_t timeout)
 {
     int ret;
 
-    /* Loop, testing for an end of transfer condition.  The channel 'result'
-   * was set to EBUSY and 'waiter' was set to true before the transfer;
-   * 'waiter' will be set to false and 'result' will be set appropriately
-   * when the transfer is completed.
-   */
-
+    /* wait until timeout or sem give */
     if (chan->waiter) {
         ret = usb_osal_sem_take(chan->waitsem, timeout);
         if (ret < 0) {
@@ -376,7 +319,7 @@ static int musb_pipe_wait(struct musb_pipe *chan, uint32_t timeout)
         }
     }
 
-    /* The transfer is complete and return the result */
+    /* Sem give, check if giving from error isr */
     ret = chan->result;
 
     if (ret < 0) {
@@ -386,19 +329,6 @@ static int musb_pipe_wait(struct musb_pipe *chan, uint32_t timeout)
     return chan->xfrd;
 }
 
-/****************************************************************************
- * Name: musb_pipe_wakeup
- *
- * Description:
- *   A channel transfer has completed... wakeup any threads waiting for the
- *   transfer to complete.
- *
- * Assumptions:
- *   This function is called from the transfer complete interrupt handler for
- *   the channel.  Interrupts are disabled.
- *
- ****************************************************************************/
-
 static void musb_pipe_wakeup(struct musb_pipe *chan)
 {
     usbh_asynch_callback_t callback;
@@ -406,16 +336,11 @@ static void musb_pipe_wakeup(struct musb_pipe *chan)
     int nbytes;
 
     chan->enable = false;
-    /* Is the transfer complete? */
     if (chan->waiter) {
-        /* Wake'em up! */
         chan->waiter = false;
         usb_osal_sem_give(chan->waitsem);
     }
 #ifdef CONFIG_USBHOST_ASYNCH
-    /* No.. is an asynchronous callback expected when the transfer
-       * completes?
-       */
     else if (chan->callback) {
         callback = chan->callback;
         arg = chan->arg;
@@ -894,7 +819,6 @@ int usbh_ep_bulk_async_transfer(usbh_epinfo_t ep, uint8_t *buffer, uint32_t bufl
     return ret;
 errout_with_mutex:
     chan->enable = false;
-    chan->enable = false;
     usb_osal_mutex_give(g_musb_hcd.exclsem[chan->ep_idx]);
     return ret;
 }
@@ -967,7 +891,6 @@ int usbh_ep_intr_async_transfer(usbh_epinfo_t ep, uint8_t *buffer, uint32_t bufl
     return ret;
 errout_with_mutex:
     chan->enable = false;
-    chan->enable = false;
     usb_osal_mutex_give(g_musb_hcd.exclsem[chan->ep_idx]);
     return ret;
 }
@@ -995,17 +918,15 @@ int usb_ep_cancel(usbh_epinfo_t ep)
 
     chan->enable = false;
     usb_osal_leave_critical_section(flags);
-    /* Is there a thread waiting for this transfer to complete? */
 
+    /* Check if there is a thread waiting for this transfer to complete? */
     if (chan->waiter) {
-        /* Wake'em up! */
         chan->waiter = false;
         usb_osal_sem_give(chan->waitsem);
     }
 #ifdef CONFIG_USBHOST_ASYNCH
     /* No.. is an asynchronous callback expected when the transfer completes? */
     else if (callback) {
-        /* Then perform the callback */
         callback(arg, -ESHUTDOWN);
     }
 #endif
diff --git a/port/template/usb_dc.c b/port/template/usb_dc.c
index c6148865..097041f8 100644
--- a/port/template/usb_dc.c
+++ b/port/template/usb_dc.c
@@ -1,7 +1,7 @@
 #include "usbd_core.h"
 
 #ifndef USBD_IRQHandler
-#define USBD_IRQHandler USB_FS_Handler //use actual usb irq name instead
+#define USBD_IRQHandler USBD_IRQHandler
 #endif
 
 #ifndef USB_NUM_BIDIR_ENDPOINTS
diff --git a/port/template/usb_hc.c b/port/template/usb_hc.c
index b5a0007f..c330a1e5 100644
--- a/port/template/usb_hc.c
+++ b/port/template/usb_hc.c
@@ -1,7 +1,7 @@
 #include "usbh_core.h"
 
 #ifndef USBH_IRQHandler
-#define USBH_IRQHandler OTG_FS_IRQHandler
+#define USBH_IRQHandler USBH_IRQHandler
 #endif
 
 struct xxx_pipe {
@@ -20,65 +20,25 @@ struct xxx_hcd {
     struct xxx_pipe chan[5];
 } g_xxx_hcd;
 
-/****************************************************************************
- * Name: xxx_pipe_alloc
- *
- * Description:
- *   Allocate a channel.
- *
- ****************************************************************************/
-
 static int xxx_pipe_alloc(void)
 {
     int chidx;
 
-    /* Search the table of channels */
-
     for (chidx = 0; chidx < HCD_MAX_ENDPOINT; chidx++) {
-        /* Is this channel available? */
         if (!g_xxx_hcd.chan[chidx].inuse) {
-            /* Yes... make it "in use" and return the index */
-
             g_xxx_hcd.chan[chidx].inuse = true;
             return chidx;
         }
     }
 
-    /* All of the channels are "in-use" */
-
     return -EBUSY;
 }
 
-/****************************************************************************
- * Name: xxx_pipe_free
- *
- * Description:
- *   Free a previoiusly allocated channel.
- *
- ****************************************************************************/
-
 static void xxx_pipe_free(struct xxx_pipe *chan)
 {
-    /* Mark the channel available */
-
     chan->inuse = false;
 }
 
-/****************************************************************************
- * Name: xxx_pipe_waitsetup
- *
- * Description:
- *   Set the request for the transfer complete event well BEFORE enabling
- *   the transfer (as soon as we are absolutely committed to the transfer).
- *   We do this to minimize race conditions.  This logic would have to be
- *   expanded if we want to have more than one packet in flight at a time!
- *
- * Assumptions:
- *   Called from a normal thread context BEFORE the transfer has been
- *   started.
- *
- ****************************************************************************/
-
 static int xxx_pipe_waitsetup(struct xxx_pipe *chan)
 {
     size_t flags;
@@ -86,13 +46,8 @@ static int xxx_pipe_waitsetup(struct xxx_pipe *chan)
 
     flags = usb_osal_enter_critical_section();
 
-    /* Is the device still connected? */
-
     if (usbh_get_port_connect_status(1)) {
-        /* Yes.. then set waiter to indicate that we expect to be informed
-       * when either (1) the device is disconnected, or (2) the transfer
-       * completed.
-       */
+
         chan->waiter = true;
         chan->result = -EBUSY;
         chan->xfrd = 0;
@@ -106,21 +61,6 @@ static int xxx_pipe_waitsetup(struct xxx_pipe *chan)
     return ret;
 }
 
-/****************************************************************************
- * Name: xxx_pipe_asynchsetup
- *
- * Description:
- *   Set the request for the transfer complete event well BEFORE enabling
- *   the transfer (as soon as we are absolutely committed to the to avoid
- *   transfer).  We do this to minimize race conditions.  This logic would
- *   have to be expanded if we want to have more than one packet in flight
- *   at a time!
- *
- * Assumptions:
- *   Might be called from the level of an interrupt handler
- *
- ****************************************************************************/
-
 #ifdef CONFIG_USBHOST_ASYNCH
 static int xxx_pipe_asynchsetup(struct xxx_pipe *chan, usbh_asynch_callback_t callback, void *arg)
 {
@@ -128,13 +68,8 @@ static int xxx_pipe_asynchsetup(struct xxx_pipe *chan, usbh_asynch_callback_t ca
     int ret = -ENODEV;
 
     flags = usb_osal_enter_critical_section();
-    /* Is the device still connected? */
 
     if (usbh_get_port_connect_status(1)) {
-        /* Yes.. then set waiter to indicate that we expect to be informed
-       * when either (1) the device is disconnected, or (2) the transfer
-       * completed.
-       */
 
         chan->waiter = false;
         chan->result = -EBUSY;
@@ -150,27 +85,10 @@ static int xxx_pipe_asynchsetup(struct xxx_pipe *chan, usbh_asynch_callback_t ca
 }
 #endif
 
-/****************************************************************************
- * Name: xxx_pipe_wait
- *
- * Description:
- *   Wait for a transfer on a channel to complete.
- *
- * Assumptions:
- *   Called from a normal thread context
- *
- ****************************************************************************/
-
 static int xxx_pipe_wait(struct xxx_pipe *chan, uint32_t timeout)
 {
     int ret;
 
-    /* Loop, testing for an end of transfer condition.  The channel 'result'
-   * was set to EBUSY and 'waiter' was set to true before the transfer;
-   * 'waiter' will be set to false and 'result' will be set appropriately
-   * when the transfer is completed.
-   */
-
     if (chan->waiter) {
         ret = usb_osal_sem_take(chan->waitsem, timeout);
         if (ret < 0) {
@@ -178,7 +96,6 @@ static int xxx_pipe_wait(struct xxx_pipe *chan, uint32_t timeout)
         }
     }
 
-    /* The transfer is complete re-enable interrupts and return the result */
     ret = chan->result;
 
     if (ret < 0) {
@@ -187,53 +104,30 @@ static int xxx_pipe_wait(struct xxx_pipe *chan, uint32_t timeout)
     return chan->xfrd;
 }
 
-/****************************************************************************
- * Name: xxx_pipe_wakeup
- *
- * Description:
- *   A channel transfer has completed... wakeup any threads waiting for the
- *   transfer to complete.
- *
- * Assumptions:
- *   This function is called from the transfer complete interrupt handler for
- *   the channel.  Interrupts are disabled.
- *
- ****************************************************************************/
-
 static void xxx_pipe_wakeup(struct xxx_pipe *chan)
 {
     usbh_asynch_callback_t callback;
     void *arg;
     int nbytes;
 
-    /* Is the transfer complete? */
-
-    if (chan->result != -EBUSY) {
-        /* Is there a thread waiting for this transfer to complete? */
-
-        if (chan->waiter) {
-            /* Wake'em up! */
-            chan->waiter = false;
-            usb_osal_sem_give(chan->waitsem);
-        }
+    if (chan->waiter) {
+        chan->waiter = false;
+        usb_osal_sem_give(chan->waitsem);
+    }
 #ifdef CONFIG_USBHOST_ASYNCH
-        /* No.. is an asynchronous callback expected when the transfer
-       * completes?
-       */
-        else if (chan->callback) {
-            callback = chan->callback;
-            arg = chan->arg;
-            nbytes = chan->xfrd;
-            chan->callback = NULL;
-            chan->arg = NULL;
-            if (chan->result < 0) {
-                nbytes = chan->result;
-            }
-
-            callback(arg, nbytes);
+    else if (chan->callback) {
+        callback = chan->callback;
+        arg = chan->arg;
+        nbytes = chan->xfrd;
+        chan->callback = NULL;
+        chan->arg = NULL;
+        if (chan->result < 0) {
+            nbytes = chan->result;
         }
-#endif
+
+        callback(arg, nbytes);
     }
+#endif
 }
 
 __WEAK void usb_hc_low_level_init(void)