diff --git a/cherryusb_config_template.h b/cherryusb_config_template.h
index c0eb9751..d7fc7270 100644
--- a/cherryusb_config_template.h
+++ b/cherryusb_config_template.h
@@ -79,11 +79,12 @@
 
 /* ================ USB HOST Stack Configuration ================== */
 
-#define CONFIG_USBHOST_RHPORTS    1
-#define CONFIG_USBHOST_EXTHUB_NUM 1
-#define CONFIG_USBHOST_EHPORTS    4
-#define CONFIG_USBHOST_INTF_NUM   6
-#define CONFIG_USBHOST_EP_NUM     4
+#define CONFIG_USBHOST_MAX_RHPORTS          1
+#define CONFIG_USBHOST_MAX_EXTHUBS          1
+#define CONFIG_USBHOST_MAX_EHPORTS          4
+#define CONFIG_USBHOST_MAX_INTERFACES       6
+#define CONFIG_USBHOST_MAX_INTF_ALTSETTINGS 1
+#define CONFIG_USBHOST_MAX_ENDPOINTS        4
 
 #define CONFIG_USBHOST_DEV_NAMELEN 16
 
diff --git a/class/cdc/usbh_cdc_acm.c b/class/cdc/usbh_cdc_acm.c
index 0afbcde0..bb01e88c 100644
--- a/class/cdc/usbh_cdc_acm.c
+++ b/class/cdc/usbh_cdc_acm.c
@@ -111,7 +111,6 @@ int usbh_cdc_acm_set_line_state(struct usbh_cdc_acm *cdc_acm_class, bool dtr, bo
 
 static int usbh_cdc_acm_connect(struct usbh_hubport *hport, uint8_t intf)
 {
-    struct usbh_endpoint_cfg ep_cfg = { 0 };
     struct usb_endpoint_descriptor *ep_desc;
     int ret;
 
@@ -147,7 +146,7 @@ static int usbh_cdc_acm_connect(struct usbh_hubport *hport, uint8_t intf)
     }
 
 #ifdef CONFIG_USBHOST_CDC_ACM_NOTIFY
-    ep_desc = &hport->config.intf[intf].ep[0].ep_desc;
+    ep_desc = &hport->config.intf[intf].altsetting[0].ep[0].ep_desc;
     ep_cfg.ep_addr = ep_desc->bEndpointAddress;
     ep_cfg.ep_type = ep_desc->bmAttributes & USB_ENDPOINT_TYPE_MASK;
     ep_cfg.ep_mps = ep_desc->wMaxPacketSize;
@@ -156,25 +155,14 @@ static int usbh_cdc_acm_connect(struct usbh_hubport *hport, uint8_t intf)
     usbh_pipe_alloc(&cdc_acm_class->intin, &ep_cfg);
 
 #endif
-    for (uint8_t i = 0; i < hport->config.intf[intf + 1].intf_desc.bNumEndpoints; i++) {
-        ep_desc = &hport->config.intf[intf + 1].ep[i].ep_desc;
+    for (uint8_t i = 0; i < hport->config.intf[intf + 1].altsetting[0].intf_desc.bNumEndpoints; i++) {
+        ep_desc = &hport->config.intf[intf + 1].altsetting[0].ep[i].ep_desc;
 
-        ep_cfg.ep_addr = ep_desc->bEndpointAddress;
-        ep_cfg.ep_type = ep_desc->bmAttributes & USB_ENDPOINT_TYPE_MASK;
-        ep_cfg.ep_mps = ep_desc->wMaxPacketSize & USB_MAXPACKETSIZE_MASK;
-        ep_cfg.ep_interval = ep_desc->bInterval;
-        ep_cfg.hport = hport;
         if (ep_desc->bEndpointAddress & 0x80) {
-            usbh_pipe_alloc(&cdc_acm_class->bulkin, &ep_cfg);
+            usbh_hport_activate_epx(&cdc_acm_class->bulkin, hport, ep_desc);
         } else {
-            usbh_pipe_alloc(&cdc_acm_class->bulkout, &ep_cfg);
+            usbh_hport_activate_epx(&cdc_acm_class->bulkout, hport, ep_desc);
         }
-
-        USB_LOG_INFO("Ep=%02x Attr=%02u Mps=%d Interval=%02u\r\n",
-                     ep_desc->bEndpointAddress,
-                     ep_desc->bmAttributes,
-                     ep_desc->wMaxPacketSize,
-                     ep_desc->bInterval);
     }
 
     snprintf(hport->config.intf[intf].devname, CONFIG_USBHOST_DEV_NAMELEN, DEV_FORMAT, cdc_acm_class->minor);
@@ -191,7 +179,6 @@ static int usbh_cdc_acm_disconnect(struct usbh_hubport *hport, uint8_t intf)
     struct usbh_cdc_acm *cdc_acm_class = (struct usbh_cdc_acm *)hport->config.intf[intf].priv;
 
     if (cdc_acm_class) {
-
         usbh_cdc_acm_devno_free(cdc_acm_class);
 
         if (cdc_acm_class->bulkin) {
diff --git a/class/hid/usbh_hid.c b/class/hid/usbh_hid.c
index 9001e751..e844177b 100644
--- a/class/hid/usbh_hid.c
+++ b/class/hid/usbh_hid.c
@@ -112,7 +112,6 @@ int usbh_hid_get_idle(struct usbh_hid *hid_class, uint8_t *buffer)
 
 int usbh_hid_connect(struct usbh_hubport *hport, uint8_t intf)
 {
-    struct usbh_endpoint_cfg ep_cfg = { 0 };
     struct usb_endpoint_descriptor *ep_desc;
     int ret;
 
@@ -139,24 +138,13 @@ int usbh_hid_connect(struct usbh_hubport *hport, uint8_t intf)
         return ret;
     }
 
-    for (uint8_t i = 0; i < hport->config.intf[intf].intf_desc.bNumEndpoints; i++) {
-        ep_desc = &hport->config.intf[intf].ep[i].ep_desc;
-        ep_cfg.ep_addr = ep_desc->bEndpointAddress;
-        ep_cfg.ep_type = ep_desc->bmAttributes & USB_ENDPOINT_TYPE_MASK;
-        ep_cfg.ep_mps = ep_desc->wMaxPacketSize & USB_MAXPACKETSIZE_MASK;
-        ep_cfg.ep_interval = ep_desc->bInterval;
-        ep_cfg.hport = hport;
+    for (uint8_t i = 0; i < hport->config.intf[intf].altsetting[0].intf_desc.bNumEndpoints; i++) {
+        ep_desc = &hport->config.intf[intf].altsetting[0].ep[i].ep_desc;
         if (ep_desc->bEndpointAddress & 0x80) {
-            usbh_pipe_alloc(&hid_class->intin, &ep_cfg);
+            usbh_hport_activate_epx(&hid_class->intin, hport, ep_desc);
         } else {
-            usbh_pipe_alloc(&hid_class->intout, &ep_cfg);
+            usbh_hport_activate_epx(&hid_class->intout, hport, ep_desc);
         }
-
-        USB_LOG_INFO("Ep=%02x Attr=%02u Mps=%d Interval=%02u\r\n",
-                     ep_desc->bEndpointAddress,
-                     ep_desc->bmAttributes,
-                     ep_desc->wMaxPacketSize,
-                     ep_desc->bInterval);
     }
 
     snprintf(hport->config.intf[intf].devname, CONFIG_USBHOST_DEV_NAMELEN, DEV_FORMAT, hid_class->minor);
diff --git a/class/hub/usbh_hub.c b/class/hub/usbh_hub.c
index 3efdc195..892a3eef 100644
--- a/class/hub/usbh_hub.c
+++ b/class/hub/usbh_hub.c
@@ -26,7 +26,7 @@ usb_osal_thread_t hub_thread;
 USB_NOCACHE_RAM_SECTION struct usbh_hub roothub;
 struct usbh_hubport roothub_parent_port;
 
-USB_NOCACHE_RAM_SECTION struct usbh_hub exthub[CONFIG_USBHOST_EXTHUB_NUM];
+USB_NOCACHE_RAM_SECTION struct usbh_hub exthub[CONFIG_USBHOST_MAX_EXTHUBS];
 
 extern int usbh_hport_activate_ep0(struct usbh_hubport *hport);
 extern int usbh_hport_deactivate_ep0(struct usbh_hubport *hport);
@@ -261,14 +261,13 @@ static void hub_int_complete_callback(void *arg, int nbytes)
 
 static int usbh_hub_connect(struct usbh_hubport *hport, uint8_t intf)
 {
-    struct usbh_endpoint_cfg ep_cfg = { 0 };
     struct usb_endpoint_descriptor *ep_desc;
     struct hub_port_status port_status;
     int ret;
     int index;
 
     index = usbh_hub_devno_alloc();
-    if (index > (CONFIG_USBHOST_EXTHUB_NUM + EXTHUB_FIRST_INDEX)) {
+    if (index > (CONFIG_USBHOST_MAX_EXTHUBS + EXTHUB_FIRST_INDEX)) {
         return -ENOMEM;
     }
 
@@ -293,19 +292,9 @@ static int usbh_hub_connect(struct usbh_hubport *hport, uint8_t intf)
         hub->child[port].parent = hub;
     }
 
-    ep_desc = &hport->config.intf[intf].ep[0].ep_desc;
-    ep_cfg.ep_addr = ep_desc->bEndpointAddress;
-    ep_cfg.ep_type = ep_desc->bmAttributes & USB_ENDPOINT_TYPE_MASK;
-    ep_cfg.ep_mps = ep_desc->wMaxPacketSize & USB_MAXPACKETSIZE_MASK;
-    ep_cfg.ep_interval = ep_desc->bInterval;
-    ep_cfg.hport = hport;
+    ep_desc = &hport->config.intf[intf].altsetting[0].ep[0].ep_desc;
     if (ep_desc->bEndpointAddress & 0x80) {
-        usbh_pipe_alloc(&hub->intin, &ep_cfg);
-        USB_LOG_INFO("Ep=%02x Attr=%02u Mps=%d Interval=%02u\r\n",
-                     ep_desc->bEndpointAddress,
-                     ep_desc->bmAttributes,
-                     ep_desc->wMaxPacketSize,
-                     ep_desc->bInterval);
+        usbh_hport_activate_epx(&hub->intin, hport, ep_desc);
     } else {
         return -1;
     }
@@ -382,7 +371,7 @@ static void usbh_roothub_register(void)
     roothub.is_roothub = true;
     roothub.parent = &roothub_parent_port;
     roothub.hub_addr = roothub_parent_port.dev_addr;
-    roothub.hub_desc.bNbrPorts = CONFIG_USBHOST_RHPORTS;
+    roothub.hub_desc.bNbrPorts = CONFIG_USBHOST_MAX_RHPORTS;
     usbh_hub_register(&roothub);
 }
 
@@ -542,7 +531,7 @@ static void usbh_hub_events(struct usbh_hub *hub)
 
                 USB_LOG_INFO("Device on Hub %u, Port %u disconnected\r\n", hub->index, port + 1);
                 usbh_device_unmount_done_callback(child);
-                memset(child, 0, sizeof(struct usbh_hubport));
+                child->config.config_desc.bNumInterfaces = 0;
             }
         }
     }
@@ -553,7 +542,6 @@ static void usbh_hub_thread(void *argument)
     size_t flags;
     int ret = 0;
 
-    usbh_roothub_register();
     usb_hc_init();
     while (1) {
         ret = usb_osal_sem_take(hub_event_wait, 0xffffffff);
@@ -589,6 +577,8 @@ void usbh_hub_unregister(struct usbh_hub *hub)
 
 int usbh_hub_initialize(void)
 {
+    usbh_roothub_register();
+
     hub_event_wait = usb_osal_sem_create(0);
     if (hub_event_wait == NULL) {
         return -1;
diff --git a/class/msc/usbh_msc.c b/class/msc/usbh_msc.c
index f6fb3942..54abe2e4 100644
--- a/class/msc/usbh_msc.c
+++ b/class/msc/usbh_msc.c
@@ -305,7 +305,6 @@ int usbh_msc_scsi_read10(struct usbh_msc *msc_class, uint32_t start_sector, cons
 
 static int usbh_msc_connect(struct usbh_hubport *hport, uint8_t intf)
 {
-    struct usbh_endpoint_cfg ep_cfg = { 0 };
     struct usb_endpoint_descriptor *ep_desc;
     int ret;
 
@@ -329,25 +328,13 @@ static int usbh_msc_connect(struct usbh_hubport *hport, uint8_t intf)
 
     USB_LOG_INFO("Get max LUN:%u\r\n", g_msc_buf[0] + 1);
 
-    for (uint8_t i = 0; i < hport->config.intf[intf].intf_desc.bNumEndpoints; i++) {
-        ep_desc = &hport->config.intf[intf].ep[i].ep_desc;
-
-        ep_cfg.ep_addr = ep_desc->bEndpointAddress;
-        ep_cfg.ep_type = ep_desc->bmAttributes & USB_ENDPOINT_TYPE_MASK;
-        ep_cfg.ep_mps = ep_desc->wMaxPacketSize & USB_MAXPACKETSIZE_MASK;
-        ep_cfg.ep_interval = ep_desc->bInterval;
-        ep_cfg.hport = hport;
+    for (uint8_t i = 0; i < hport->config.intf[intf].altsetting[0].intf_desc.bNumEndpoints; i++) {
+        ep_desc = &hport->config.intf[intf].altsetting[0].ep[i].ep_desc;
         if (ep_desc->bEndpointAddress & 0x80) {
-            usbh_pipe_alloc(&msc_class->bulkin, &ep_cfg);
+            usbh_hport_activate_epx(&msc_class->bulkin, hport, ep_desc);
         } else {
-            usbh_pipe_alloc(&msc_class->bulkout, &ep_cfg);
+            usbh_hport_activate_epx(&msc_class->bulkout, hport, ep_desc);
         }
-
-        USB_LOG_INFO("Ep=%02x Attr=%02u Mps=%d Interval=%02u\r\n",
-                     ep_desc->bEndpointAddress,
-                     ep_desc->bmAttributes,
-                     ep_desc->wMaxPacketSize,
-                     ep_desc->bInterval);
     }
 
     ret = usbh_msc_scsi_testunitready(msc_class);
diff --git a/class/wireless/usbh_rndis.c b/class/wireless/usbh_rndis.c
index cffe15a9..035a16d6 100644
--- a/class/wireless/usbh_rndis.c
+++ b/class/wireless/usbh_rndis.c
@@ -228,7 +228,7 @@ static int usbh_rndis_connect(struct usbh_hubport *hport, uint8_t intf)
     hport->config.intf[intf + 1].priv = NULL;
 
 #ifdef CONFIG_USBHOST_RNDIS_NOTIFY
-    ep_desc = &hport->config.intf[intf].ep[0].ep_desc;
+    ep_desc = &hport->config.intf[intf].altsetting[0].ep[0].ep_desc;
     ep_cfg.ep_addr = ep_desc->bEndpointAddress;
     ep_cfg.ep_type = ep_desc->bmAttributes & USB_ENDPOINT_TYPE_MASK;
     ep_cfg.ep_mps = ep_desc->wMaxPacketSize & USB_MAXPACKETSIZE_MASK;;
@@ -237,8 +237,8 @@ static int usbh_rndis_connect(struct usbh_hubport *hport, uint8_t intf)
     usbh_pipe_alloc(&rndis_class->intin, &ep_cfg);
 
 #endif
-    for (uint8_t i = 0; i < hport->config.intf[intf + 1].intf_desc.bNumEndpoints; i++) {
-        ep_desc = &hport->config.intf[intf + 1].ep[i].ep_desc;
+    for (uint8_t i = 0; i < hport->config.intf[intf + 1].altsetting[0].intf_desc.bNumEndpoints; i++) {
+        ep_desc = &hport->config.intf[intf + 1].altsetting[0].ep[i].ep_desc;
 
         ep_cfg.ep_addr = ep_desc->bEndpointAddress;
         ep_cfg.ep_type = ep_desc->bmAttributes & USB_ENDPOINT_TYPE_MASK;
diff --git a/core/usbh_core.c b/core/usbh_core.c
index d2b246fb..b03cf632 100644
--- a/core/usbh_core.c
+++ b/core/usbh_core.c
@@ -169,10 +169,10 @@ static int parse_config_descriptor(struct usbh_hubport *hport, struct usb_config
 {
     struct usb_interface_descriptor *intf_desc;
     struct usb_endpoint_descriptor *ep_desc;
-    uint8_t cur_alt_setting;
+    uint8_t cur_alt_setting = 0xff;
     uint8_t cur_iface = 0xff;
     uint8_t cur_ep = 0xff;
-    uint8_t cur_ep_num;
+    uint8_t cur_ep_num = 0xff;
     uint32_t desc_len = 0;
     uint8_t *p;
 
@@ -211,6 +211,8 @@ static int parse_config_descriptor(struct usbh_hubport *hport, struct usb_config
         p += USB_SIZEOF_CONFIG_DESC;
         desc_len = USB_SIZEOF_CONFIG_DESC;
 
+        memset(hport->config.intf, 0, sizeof(struct usbh_interface) * CONFIG_USBHOST_MAX_INTERFACES);
+
         while (p[DESC_bLength] && (desc_len <= length)) {
             switch (p[DESC_bDescriptorType]) {
                 case USB_DESCRIPTOR_TYPE_INTERFACE:
@@ -219,14 +221,15 @@ static int parse_config_descriptor(struct usbh_hubport *hport, struct usb_config
                     cur_alt_setting = intf_desc->bAlternateSetting;
                     cur_ep_num = intf_desc->bNumEndpoints;
                     cur_ep = 0;
-                    if (cur_iface > CONFIG_USBHOST_INTF_NUM) {
+                    if (cur_iface > CONFIG_USBHOST_MAX_INTERFACES) {
                         return -ENOMEM;
                     }
-                    if (cur_ep_num > CONFIG_USBHOST_EP_NUM) {
+                    if (cur_alt_setting > CONFIG_USBHOST_MAX_INTF_ALTSETTINGS) {
+                        return -ENOMEM;
+                    }
+                    if (cur_ep_num > CONFIG_USBHOST_MAX_ENDPOINTS) {
                         return -ENOMEM;
                     }
-
-                    memset(&hport->config.intf[cur_iface], 0, sizeof(struct usbh_interface));
 #if 0
                     USB_LOG_DBG("Interface Descriptor:\r\n");
                     USB_LOG_DBG("bLength: 0x%02x            \r\n", intf_desc->bLength);
@@ -239,15 +242,12 @@ static int parse_config_descriptor(struct usbh_hubport *hport, struct usb_config
                     USB_LOG_DBG("bInterfaceProtocol: 0x%02x \r\n", intf_desc->bInterfaceProtocol);
                     USB_LOG_DBG("iInterface: 0x%02x         \r\n", intf_desc->iInterface);
 #endif
-                    memcpy(&hport->config.intf[cur_iface].intf_desc, intf_desc, 9);
-                    if (cur_alt_setting == 1) {
-                        USB_LOG_WRN("Altsetting enable, the previous intf info will be overwrited\r\n");
-                    }
+                    memcpy(&hport->config.intf[cur_iface].altsetting[cur_alt_setting].intf_desc, intf_desc, 9);
+                    hport->config.intf[cur_iface].altsetting_num = cur_alt_setting + 1;
                     break;
                 case USB_DESCRIPTOR_TYPE_ENDPOINT:
                     ep_desc = (struct usb_endpoint_descriptor *)p;
-                    memset(&hport->config.intf[cur_iface].ep[cur_ep], 0, sizeof(struct usbh_endpoint));
-                    memcpy(&hport->config.intf[cur_iface].ep[cur_ep].ep_desc, ep_desc, 7);
+                    memcpy(&hport->config.intf[cur_iface].altsetting[cur_alt_setting].ep[cur_ep].ep_desc, ep_desc, 7);
                     cur_ep++;
                     break;
 
@@ -308,25 +308,27 @@ static void usbh_print_hubport_info(struct usbh_hubport *hport)
     USB_LOG_RAW("bMaxPower: 0x%02x           \r\n", hport->config.config_desc.bMaxPower);
 
     for (uint8_t i = 0; i < hport->config.config_desc.bNumInterfaces; i++) {
-        USB_LOG_RAW("Interface Descriptor:\r\n");
-        USB_LOG_RAW("bLength: 0x%02x            \r\n", hport->config.intf[i].intf_desc.bLength);
-        USB_LOG_RAW("bDescriptorType: 0x%02x    \r\n", hport->config.intf[i].intf_desc.bDescriptorType);
-        USB_LOG_RAW("bInterfaceNumber: 0x%02x   \r\n", hport->config.intf[i].intf_desc.bInterfaceNumber);
-        USB_LOG_RAW("bAlternateSetting: 0x%02x  \r\n", hport->config.intf[i].intf_desc.bAlternateSetting);
-        USB_LOG_RAW("bNumEndpoints: 0x%02x      \r\n", hport->config.intf[i].intf_desc.bNumEndpoints);
-        USB_LOG_RAW("bInterfaceClass: 0x%02x    \r\n", hport->config.intf[i].intf_desc.bInterfaceClass);
-        USB_LOG_RAW("bInterfaceSubClass: 0x%02x \r\n", hport->config.intf[i].intf_desc.bInterfaceSubClass);
-        USB_LOG_RAW("bInterfaceProtocol: 0x%02x \r\n", hport->config.intf[i].intf_desc.bInterfaceProtocol);
-        USB_LOG_RAW("iInterface: 0x%02x         \r\n", hport->config.intf[i].intf_desc.iInterface);
+        for (uint8_t j = 0; j < hport->config.intf[i].altsetting_num; j++) {
+            USB_LOG_RAW("Interface Descriptor:\r\n");
+            USB_LOG_RAW("bLength: 0x%02x            \r\n", hport->config.intf[i].altsetting[j].intf_desc.bLength);
+            USB_LOG_RAW("bDescriptorType: 0x%02x    \r\n", hport->config.intf[i].altsetting[j].intf_desc.bDescriptorType);
+            USB_LOG_RAW("bInterfaceNumber: 0x%02x   \r\n", hport->config.intf[i].altsetting[j].intf_desc.bInterfaceNumber);
+            USB_LOG_RAW("bAlternateSetting: 0x%02x  \r\n", hport->config.intf[i].altsetting[j].intf_desc.bAlternateSetting);
+            USB_LOG_RAW("bNumEndpoints: 0x%02x      \r\n", hport->config.intf[i].altsetting[j].intf_desc.bNumEndpoints);
+            USB_LOG_RAW("bInterfaceClass: 0x%02x    \r\n", hport->config.intf[i].altsetting[j].intf_desc.bInterfaceClass);
+            USB_LOG_RAW("bInterfaceSubClass: 0x%02x \r\n", hport->config.intf[i].altsetting[j].intf_desc.bInterfaceSubClass);
+            USB_LOG_RAW("bInterfaceProtocol: 0x%02x \r\n", hport->config.intf[i].altsetting[j].intf_desc.bInterfaceProtocol);
+            USB_LOG_RAW("iInterface: 0x%02x         \r\n", hport->config.intf[i].altsetting[j].intf_desc.iInterface);
 
-        for (uint8_t j = 0; j < hport->config.intf[i].intf_desc.bNumEndpoints; j++) {
-            USB_LOG_RAW("Endpoint Descriptor:\r\n");
-            USB_LOG_RAW("bLength: 0x%02x          \r\n", hport->config.intf[i].ep[j].ep_desc.bLength);
-            USB_LOG_RAW("bDescriptorType: 0x%02x  \r\n", hport->config.intf[i].ep[j].ep_desc.bDescriptorType);
-            USB_LOG_RAW("bEndpointAddress: 0x%02x \r\n", hport->config.intf[i].ep[j].ep_desc.bEndpointAddress);
-            USB_LOG_RAW("bmAttributes: 0x%02x     \r\n", hport->config.intf[i].ep[j].ep_desc.bmAttributes);
-            USB_LOG_RAW("wMaxPacketSize: 0x%04x   \r\n", hport->config.intf[i].ep[j].ep_desc.wMaxPacketSize);
-            USB_LOG_RAW("bInterval: 0x%02x        \r\n", hport->config.intf[i].ep[j].ep_desc.bInterval);
+            for (uint8_t k = 0; k < hport->config.intf[i].altsetting[j].intf_desc.bNumEndpoints; k++) {
+                USB_LOG_RAW("Endpoint Descriptor:\r\n");
+                USB_LOG_RAW("bLength: 0x%02x          \r\n", hport->config.intf[i].altsetting[j].ep[k].ep_desc.bLength);
+                USB_LOG_RAW("bDescriptorType: 0x%02x  \r\n", hport->config.intf[i].altsetting[j].ep[k].ep_desc.bDescriptorType);
+                USB_LOG_RAW("bEndpointAddress: 0x%02x \r\n", hport->config.intf[i].altsetting[j].ep[k].ep_desc.bEndpointAddress);
+                USB_LOG_RAW("bmAttributes: 0x%02x     \r\n", hport->config.intf[i].altsetting[j].ep[k].ep_desc.bmAttributes);
+                USB_LOG_RAW("wMaxPacketSize: 0x%04x   \r\n", hport->config.intf[i].altsetting[j].ep[k].ep_desc.wMaxPacketSize);
+                USB_LOG_RAW("bInterval: 0x%02x        \r\n", hport->config.intf[i].altsetting[j].ep[k].ep_desc.bInterval);
+            }
         }
     }
 }
@@ -359,6 +361,27 @@ int usbh_hport_deactivate_ep0(struct usbh_hubport *hport)
     return 0;
 }
 
+int usbh_hport_activate_epx(usbh_pipe_t pipe, struct usbh_hubport *hport, struct usb_endpoint_descriptor *ep_desc)
+{
+    struct usbh_endpoint_cfg ep_cfg = { 0 };
+
+    ep_cfg.ep_addr = ep_desc->bEndpointAddress;
+    ep_cfg.ep_type = ep_desc->bmAttributes & USB_ENDPOINT_TYPE_MASK;
+    ep_cfg.ep_mps = ep_desc->wMaxPacketSize & USB_MAXPACKETSIZE_MASK;
+    ep_cfg.ep_interval = ep_desc->bInterval;
+    ep_cfg.mult = (ep_desc->wMaxPacketSize & USB_MAXPACKETSIZE_ADDITIONAL_TRANSCATION_MASK) >> USB_MAXPACKETSIZE_ADDITIONAL_TRANSCATION_SHIFT;
+    ep_cfg.hport = hport;
+
+    USB_LOG_INFO("Ep=%02x Attr=%02u Mps=%d Interval=%02u Mult=%02u\r\n",
+                 ep_cfg.ep_addr,
+                 ep_desc->bmAttributes,
+                 ep_cfg.ep_mps,
+                 ep_cfg.ep_interval,
+                 ep_cfg.mult);
+
+    return usbh_pipe_alloc(pipe, &ep_cfg);
+}
+
 int usbh_enumerate(struct usbh_hubport *hport)
 {
     struct usb_interface_descriptor *intf_desc;
@@ -561,7 +584,7 @@ int usbh_enumerate(struct usbh_hubport *hport)
     USB_LOG_INFO("Enumeration success, start loading class driver\r\n");
     /*search supported class driver*/
     for (uint8_t i = 0; i < hport->config.config_desc.bNumInterfaces; i++) {
-        intf_desc = &hport->config.intf[i].intf_desc;
+        intf_desc = &hport->config.intf[i].altsetting[0].intf_desc;
 
         struct usbh_class_driver *class_driver = (struct usbh_class_driver *)usbh_find_class_driver(intf_desc->bInterfaceClass, intf_desc->bInterfaceSubClass, intf_desc->bInterfaceProtocol, hport->device_desc.idVendor, hport->device_desc.idProduct);
 
diff --git a/core/usbh_core.h b/core/usbh_core.h
index 65856b0c..8d9ee453 100644
--- a/core/usbh_core.h
+++ b/core/usbh_core.h
@@ -93,6 +93,23 @@ static inline void usbh_int_urb_fill(struct usbh_urb *urb,
     urb->arg = arg;
 }
 
+static inline void usbh_iso_urb_fill(struct usbh_urb *urb,
+                                     usbh_pipe_t pipe,
+                                     uint8_t *transfer_buffer,
+                                     uint32_t transfer_buffer_length,
+                                     uint32_t timeout,
+                                     usbh_complete_callback_t complete,
+                                     void *arg)
+{
+    urb->pipe = pipe;
+    urb->setup = NULL;
+    urb->transfer_buffer = transfer_buffer;
+    urb->transfer_buffer_length = transfer_buffer_length;
+    urb->timeout = timeout;
+    urb->complete = complete;
+    urb->arg = arg;
+}
+
 struct usbh_class_info {
     uint8_t match_flags; /* Used for product specific matches; range is inclusive */
     uint8_t class;       /* Base device class code */
@@ -114,9 +131,14 @@ struct usbh_endpoint {
     struct usb_endpoint_descriptor ep_desc;
 };
 
-struct usbh_interface {
+struct usbh_interface_altsetting {
     struct usb_interface_descriptor intf_desc;
-    struct usbh_endpoint ep[CONFIG_USBHOST_EP_NUM];
+    struct usbh_endpoint ep[CONFIG_USBHOST_MAX_ENDPOINTS];
+};
+
+struct usbh_interface {
+    struct usbh_interface_altsetting altsetting[CONFIG_USBHOST_MAX_INTF_ALTSETTINGS];
+    uint8_t altsetting_num;
     char devname[CONFIG_USBHOST_DEV_NAMELEN];
     struct usbh_class_driver *class_driver;
     void *priv;
@@ -124,7 +146,7 @@ struct usbh_interface {
 
 struct usbh_configuration {
     struct usb_configuration_descriptor config_desc;
-    struct usbh_interface intf[CONFIG_USBHOST_INTF_NUM];
+    struct usbh_interface intf[CONFIG_USBHOST_MAX_INTERFACES];
 };
 
 struct usbh_hubport {
@@ -155,11 +177,13 @@ struct usbh_hub {
     USB_MEM_ALIGNX uint8_t int_buffer[1];
     struct usbh_urb inturb;
     struct usb_hub_descriptor hub_desc;
-    struct usbh_hubport child[CONFIG_USBHOST_EHPORTS];
+    struct usbh_hubport child[CONFIG_USBHOST_MAX_EHPORTS];
     struct usbh_hubport *parent;
     usb_slist_t hub_event_list;
 };
 
+int usbh_hport_activate_epx(usbh_pipe_t pipe, struct usbh_hubport *hport, struct usb_endpoint_descriptor *ep_desc);
+
 /* usb host transfer wrapper */
 
 /**
diff --git a/demo/es32/usb_device/ES32F369x/Inc/usb_config.h b/demo/es32/usb_device/ES32F369x/Inc/usb_config.h
index 9573485f..d7fc7270 100644
--- a/demo/es32/usb_device/ES32F369x/Inc/usb_config.h
+++ b/demo/es32/usb_device/ES32F369x/Inc/usb_config.h
@@ -79,10 +79,12 @@
 
 /* ================ USB HOST Stack Configuration ================== */
 
-#define CONFIG_USBHOST_RHPORTS  1
-#define CONFIG_USBHOST_EHPORTS  4
-#define CONFIG_USBHOST_INTF_NUM 6
-#define CONFIG_USBHOST_EP_NUM   4
+#define CONFIG_USBHOST_MAX_RHPORTS          1
+#define CONFIG_USBHOST_MAX_EXTHUBS          1
+#define CONFIG_USBHOST_MAX_EHPORTS          4
+#define CONFIG_USBHOST_MAX_INTERFACES       6
+#define CONFIG_USBHOST_MAX_INTF_ALTSETTINGS 1
+#define CONFIG_USBHOST_MAX_ENDPOINTS        4
 
 #define CONFIG_USBHOST_DEV_NAMELEN 16
 
diff --git a/demo/es32/usb_host/ES32F369x/Inc/usb_config.h b/demo/es32/usb_host/ES32F369x/Inc/usb_config.h
index fc84dcaf..078010e6 100644
--- a/demo/es32/usb_host/ES32F369x/Inc/usb_config.h
+++ b/demo/es32/usb_host/ES32F369x/Inc/usb_config.h
@@ -79,11 +79,12 @@
 
 /* ================ USB HOST Stack Configuration ================== */
 
-#define CONFIG_USBHOST_RHPORTS    1
-#define CONFIG_USBHOST_EXTHUB_NUM 1
-#define CONFIG_USBHOST_EHPORTS    4
-#define CONFIG_USBHOST_INTF_NUM   6
-#define CONFIG_USBHOST_EP_NUM     4
+#define CONFIG_USBHOST_MAX_RHPORTS          1
+#define CONFIG_USBHOST_MAX_EXTHUBS          1
+#define CONFIG_USBHOST_MAX_EHPORTS          4
+#define CONFIG_USBHOST_MAX_INTERFACES       6
+#define CONFIG_USBHOST_MAX_INTF_ALTSETTINGS 1
+#define CONFIG_USBHOST_MAX_ENDPOINTS        4
 
 #define CONFIG_USBHOST_DEV_NAMELEN 16
 
diff --git a/demo/hpm/usb_device/src/usb_config.h b/demo/hpm/usb_device/src/usb_config.h
index 430b3cb4..ff2ec878 100644
--- a/demo/hpm/usb_device/src/usb_config.h
+++ b/demo/hpm/usb_device/src/usb_config.h
@@ -79,11 +79,12 @@
 
 /* ================ USB HOST Stack Configuration ================== */
 
-#define CONFIG_USBHOST_RHPORTS    1
-#define CONFIG_USBHOST_EXTHUB_NUM 1
-#define CONFIG_USBHOST_EHPORTS    4
-#define CONFIG_USBHOST_INTF_NUM   6
-#define CONFIG_USBHOST_EP_NUM     4
+#define CONFIG_USBHOST_MAX_RHPORTS          1
+#define CONFIG_USBHOST_MAX_EXTHUBS          1
+#define CONFIG_USBHOST_MAX_EHPORTS          4
+#define CONFIG_USBHOST_MAX_INTERFACES       6
+#define CONFIG_USBHOST_MAX_INTF_ALTSETTINGS 1
+#define CONFIG_USBHOST_MAX_ENDPOINTS        4
 
 #define CONFIG_USBHOST_DEV_NAMELEN 16
 
diff --git a/demo/hpm/usb_host/src/usb_config.h b/demo/hpm/usb_host/src/usb_config.h
index 430b3cb4..ff2ec878 100644
--- a/demo/hpm/usb_host/src/usb_config.h
+++ b/demo/hpm/usb_host/src/usb_config.h
@@ -79,11 +79,12 @@
 
 /* ================ USB HOST Stack Configuration ================== */
 
-#define CONFIG_USBHOST_RHPORTS    1
-#define CONFIG_USBHOST_EXTHUB_NUM 1
-#define CONFIG_USBHOST_EHPORTS    4
-#define CONFIG_USBHOST_INTF_NUM   6
-#define CONFIG_USBHOST_EP_NUM     4
+#define CONFIG_USBHOST_MAX_RHPORTS          1
+#define CONFIG_USBHOST_MAX_EXTHUBS          1
+#define CONFIG_USBHOST_MAX_EHPORTS          4
+#define CONFIG_USBHOST_MAX_INTERFACES       6
+#define CONFIG_USBHOST_MAX_INTF_ALTSETTINGS 1
+#define CONFIG_USBHOST_MAX_ENDPOINTS        4
 
 #define CONFIG_USBHOST_DEV_NAMELEN 16
 
diff --git a/demo/stm32/usb_device/stm32f103c8t6/Core/Inc/usb_config.h b/demo/stm32/usb_device/stm32f103c8t6/Core/Inc/usb_config.h
index 9573485f..d7fc7270 100644
--- a/demo/stm32/usb_device/stm32f103c8t6/Core/Inc/usb_config.h
+++ b/demo/stm32/usb_device/stm32f103c8t6/Core/Inc/usb_config.h
@@ -79,10 +79,12 @@
 
 /* ================ USB HOST Stack Configuration ================== */
 
-#define CONFIG_USBHOST_RHPORTS  1
-#define CONFIG_USBHOST_EHPORTS  4
-#define CONFIG_USBHOST_INTF_NUM 6
-#define CONFIG_USBHOST_EP_NUM   4
+#define CONFIG_USBHOST_MAX_RHPORTS          1
+#define CONFIG_USBHOST_MAX_EXTHUBS          1
+#define CONFIG_USBHOST_MAX_EHPORTS          4
+#define CONFIG_USBHOST_MAX_INTERFACES       6
+#define CONFIG_USBHOST_MAX_INTF_ALTSETTINGS 1
+#define CONFIG_USBHOST_MAX_ENDPOINTS        4
 
 #define CONFIG_USBHOST_DEV_NAMELEN 16
 
diff --git a/demo/stm32/usb_device/stm32f429igt6/Core/Inc/usb_config.h b/demo/stm32/usb_device/stm32f429igt6/Core/Inc/usb_config.h
index 9573485f..d7fc7270 100644
--- a/demo/stm32/usb_device/stm32f429igt6/Core/Inc/usb_config.h
+++ b/demo/stm32/usb_device/stm32f429igt6/Core/Inc/usb_config.h
@@ -79,10 +79,12 @@
 
 /* ================ USB HOST Stack Configuration ================== */
 
-#define CONFIG_USBHOST_RHPORTS  1
-#define CONFIG_USBHOST_EHPORTS  4
-#define CONFIG_USBHOST_INTF_NUM 6
-#define CONFIG_USBHOST_EP_NUM   4
+#define CONFIG_USBHOST_MAX_RHPORTS          1
+#define CONFIG_USBHOST_MAX_EXTHUBS          1
+#define CONFIG_USBHOST_MAX_EHPORTS          4
+#define CONFIG_USBHOST_MAX_INTERFACES       6
+#define CONFIG_USBHOST_MAX_INTF_ALTSETTINGS 1
+#define CONFIG_USBHOST_MAX_ENDPOINTS        4
 
 #define CONFIG_USBHOST_DEV_NAMELEN 16
 
diff --git a/demo/stm32/usb_device/stm32h743vbt6/Core/Inc/usb_config.h b/demo/stm32/usb_device/stm32h743vbt6/Core/Inc/usb_config.h
index 9573485f..d7fc7270 100644
--- a/demo/stm32/usb_device/stm32h743vbt6/Core/Inc/usb_config.h
+++ b/demo/stm32/usb_device/stm32h743vbt6/Core/Inc/usb_config.h
@@ -79,10 +79,12 @@
 
 /* ================ USB HOST Stack Configuration ================== */
 
-#define CONFIG_USBHOST_RHPORTS  1
-#define CONFIG_USBHOST_EHPORTS  4
-#define CONFIG_USBHOST_INTF_NUM 6
-#define CONFIG_USBHOST_EP_NUM   4
+#define CONFIG_USBHOST_MAX_RHPORTS          1
+#define CONFIG_USBHOST_MAX_EXTHUBS          1
+#define CONFIG_USBHOST_MAX_EHPORTS          4
+#define CONFIG_USBHOST_MAX_INTERFACES       6
+#define CONFIG_USBHOST_MAX_INTF_ALTSETTINGS 1
+#define CONFIG_USBHOST_MAX_ENDPOINTS        4
 
 #define CONFIG_USBHOST_DEV_NAMELEN 16
 
diff --git a/demo/stm32/usb_host/stm32f429igt6/Core/Inc/usb_config.h b/demo/stm32/usb_host/stm32f429igt6/Core/Inc/usb_config.h
index bee802f4..796311dd 100644
--- a/demo/stm32/usb_host/stm32f429igt6/Core/Inc/usb_config.h
+++ b/demo/stm32/usb_host/stm32f429igt6/Core/Inc/usb_config.h
@@ -79,11 +79,12 @@
 
 /* ================ USB HOST Stack Configuration ================== */
 
-#define CONFIG_USBHOST_RHPORTS    1
-#define CONFIG_USBHOST_EXTHUB_NUM 1
-#define CONFIG_USBHOST_EHPORTS    4
-#define CONFIG_USBHOST_INTF_NUM   6
-#define CONFIG_USBHOST_EP_NUM     4
+#define CONFIG_USBHOST_MAX_RHPORTS          1
+#define CONFIG_USBHOST_MAX_EXTHUBS          1
+#define CONFIG_USBHOST_MAX_EHPORTS          4
+#define CONFIG_USBHOST_MAX_INTERFACES       6
+#define CONFIG_USBHOST_MAX_INTF_ALTSETTINGS 1
+#define CONFIG_USBHOST_MAX_ENDPOINTS        4
 
 #define CONFIG_USBHOST_DEV_NAMELEN 16
 
diff --git a/demo/stm32/usb_host/stm32h743xih6/Core/Inc/usb_config.h b/demo/stm32/usb_host/stm32h743xih6/Core/Inc/usb_config.h
index bee802f4..796311dd 100644
--- a/demo/stm32/usb_host/stm32h743xih6/Core/Inc/usb_config.h
+++ b/demo/stm32/usb_host/stm32h743xih6/Core/Inc/usb_config.h
@@ -79,11 +79,12 @@
 
 /* ================ USB HOST Stack Configuration ================== */
 
-#define CONFIG_USBHOST_RHPORTS    1
-#define CONFIG_USBHOST_EXTHUB_NUM 1
-#define CONFIG_USBHOST_EHPORTS    4
-#define CONFIG_USBHOST_INTF_NUM   6
-#define CONFIG_USBHOST_EP_NUM     4
+#define CONFIG_USBHOST_MAX_RHPORTS          1
+#define CONFIG_USBHOST_MAX_EXTHUBS          1
+#define CONFIG_USBHOST_MAX_EHPORTS          4
+#define CONFIG_USBHOST_MAX_INTERFACES       6
+#define CONFIG_USBHOST_MAX_INTF_ALTSETTINGS 1
+#define CONFIG_USBHOST_MAX_ENDPOINTS        4
 
 #define CONFIG_USBHOST_DEV_NAMELEN 16
 
diff --git a/port/dwc2/usb_hc_dwc2.c b/port/dwc2/usb_hc_dwc2.c
index 24d9da21..a9c8364e 100644
--- a/port/dwc2/usb_hc_dwc2.c
+++ b/port/dwc2/usb_hc_dwc2.c
@@ -540,7 +540,7 @@ int usbh_roothub_control(struct usb_setup_packet *setup, uint8_t *buf)
     uint8_t port;
     uint32_t status;
 
-    nports = CONFIG_USBHOST_RHPORTS;
+    nports = CONFIG_USBHOST_MAX_RHPORTS;
     port = setup->wIndex;
     if (setup->bmRequestType & USB_REQUEST_RECIPIENT_DEVICE) {
         switch (setup->bRequest) {
diff --git a/port/musb/usb_hc_musb.c b/port/musb/usb_hc_musb.c
index 32afeb3b..5318eac8 100644
--- a/port/musb/usb_hc_musb.c
+++ b/port/musb/usb_hc_musb.c
@@ -441,7 +441,7 @@ int usbh_roothub_control(struct usb_setup_packet *setup, uint8_t *buf)
     uint8_t port;
     uint32_t status;
 
-    nports = CONFIG_USBHOST_RHPORTS;
+    nports = CONFIG_USBHOST_MAX_RHPORTS;
     port = setup->wIndex;
     if (setup->bmRequestType & USB_REQUEST_RECIPIENT_DEVICE) {
         switch (setup->bRequest) {