feat(platform/rtthread): support adb shell and serial framework

Signed-off-by: sakumisu <1203593632@qq.com>

Kconfig

@@ -123,16 +123,17 @@ if CHERRYUSB
             prompt "Enable usb mtp device, it is commercial charge"
             default n
 
-        config CHERRYUSB_DEVICE_DFU
-            bool
-            prompt "Enable usb dfu device"
-            default n
 
         config CHERRYUSB_DEVICE_ADB
             bool
             prompt "Enable usb adb device"
             default n
 
+        config CHERRYUSB_DEVICE_DFU
+            bool
+            prompt "Enable usb dfu device"
+            default n
+
         choice
             prompt "Select usb device template"
             default CHERRYUSB_DEVICE_TEMPLATE_NONE

Kconfig.rtt

@@ -125,6 +125,11 @@ if RT_USING_CHERRYUSB
             prompt "Enable usb mtp device, it is commercial charge"
             default n
 
+        config RT_CHERRYUSB_DEVICE_ADB
+            bool
+            prompt "Enable usb adb device"
+            default n
+
         config RT_CHERRYUSB_DEVICE_DFU
             bool
             prompt "Enable usb dfu device"
@@ -169,6 +174,8 @@ if RT_USING_CHERRYUSB
                 bool "winusbv2_cdc"
             config RT_CHERRYUSB_DEVICE_TEMPLATE_WINUSBV2_HID
                 bool "winusbv2_hid"
+            config RT_CHERRYUSB_DEVICE_TEMPLATE_ADB
+                bool "adb"
         endchoice
 
         config CONFIG_USBDEV_MSC_BLOCK_DEV_NAME

Kconfig.rttpkg

@@ -124,6 +124,11 @@ if PKG_USING_CHERRYUSB
             prompt "Enable usb mtp device, it is commercial charge"
             default n
 
+        config PKG_CHERRYUSB_DEVICE_ADB
+            bool
+            prompt "Enable usb adb device"
+            default n
+
         config PKG_CHERRYUSB_DEVICE_DFU
             bool
             prompt "Enable usb dfu device"
@@ -168,6 +173,8 @@ if PKG_USING_CHERRYUSB
                 bool "winusbv2_cdc"
             config PKG_CHERRYUSB_DEVICE_TEMPLATE_WINUSBV2_HID
                 bool "winusbv2_hid"
+            config PKG_CHERRYUSB_DEVICE_TEMPLATE_ADB
+                bool "adb"
         endchoice
 
         config CONFIG_USBDEV_MSC_BLOCK_DEV_NAME

SConscript

@@ -127,6 +127,9 @@ if GetDepend(['PKG_CHERRYUSB_DEVICE']):
         src += Glob('class/cdc/usbd_cdc_ncm.c')
     if GetDepend(['PKG_CHERRYUSB_DEVICE_DFU']):
         src += Glob('class/dfu/usbd_dfu.c')
+    if GetDepend(['PKG_CHERRYUSB_DEVICE_ADB']):
+        src += Glob('class/adb/usbd_adb.c')
+        src += Glob('platform/rtthread/usbd_adb_shell.c')
 
     if GetDepend(['PKG_CHERRYUSB_DEVICE_TEMPLATE_CDC_ACM']):
         src += Glob('demo/cdc_acm_template.c')
@@ -162,6 +165,8 @@ if GetDepend(['PKG_CHERRYUSB_DEVICE']):
         src += Glob('demo/winusb2.0_cdc_template.c')
     if GetDepend(['PKG_CHERRYUSB_DEVICE_TEMPLATE_WINUSBV2_HID']):
         src += Glob('demo/winusb2.0_hid_template.c')
+    if GetDepend(['PKG_CHERRYUSB_DEVICE_TEMPLATE_ADB']):
+        src += Glob('demo/adb/usbd_adb_template.c')
 
 # USB HOST
 if GetDepend(['PKG_CHERRYUSB_HOST']):
@@ -285,6 +290,13 @@ if GetDepend(['PKG_CHERRYUSB_HOST']):
         CPPDEFINES+=['TEST_USBH_MSC=0']
         src += Glob('demo/usb_host.c')
 
+    if GetDepend(['PKG_CHERRYUSB_HOST_CDC_ACM'])    \
+        or GetDepend(['PKG_CHERRYUSB_HOST_FTDI'])   \
+        or GetDepend(['PKG_CHERRYUSB_HOST_CH34X'])  \
+        or GetDepend(['PKG_CHERRYUSB_HOST_CP210X']) \
+        or GetDepend(['PKG_CHERRYUSB_HOST_PL2303']):
+        src += Glob('platform/rtthread/usbh_serial.c')
+
     if GetDepend('RT_USING_DFS') and GetDepend(['PKG_CHERRYUSB_HOST_MSC']):
        src += Glob('platform/rtthread/usbh_dfs.c')
 

demo/adb/usbd_adb_template.c

@@ -164,7 +164,7 @@ static const char *string_descriptor_callback(uint8_t speed, uint8_t index)
     return string_descriptors[index];
 }
 
-const struct usb_descriptor msc_bootuf2_descriptor = {
+const struct usb_descriptor adb_descriptor = {
     .device_descriptor_callback = device_descriptor_callback,
     .config_descriptor_callback = config_descriptor_callback,
     .device_quality_descriptor_callback = device_quality_descriptor_callback,
@@ -274,9 +274,16 @@ static void usbd_event_handler(uint8_t busid, uint8_t event)
 
 static struct usbd_interface intf0;
 
+#ifdef RT_USING_MSH
+extern void usbd_adb_shell_init(uint8_t in_ep, uint8_t out_ep);
+#else
 extern int shell_init(bool need_login);
+#endif
 void cherryadb_init(uint8_t busid, uint32_t reg_base)
 {
+#ifdef RT_USING_MSH
+    usbd_adb_shell_init(WINUSB_IN_EP, WINUSB_OUT_EP);
+#else
     /* default password is : 12345678 */
     /* shell_init() must be called in-task */
     if (0 != shell_init(false)) {
@@ -286,7 +293,7 @@ void cherryadb_init(uint8_t busid, uint32_t reg_base)
             ;
         }
     }
-
+#endif
 #ifdef CONFIG_USBDEV_ADVANCE_DESC
     usbd_desc_register(busid, &adb_descriptor);
 #else

platform/README.md

@@ -18,7 +18,8 @@ lwip support with usb host net class(cdc_ecm/cdc_ncm/cdc_rndis/asix/rtl8152/bl61
 - DFS support with usb host msc.
 - lwip support with usb host net class(cdc_ecm/cdc_ncm/cdc_rndis/asix/rtl8152/bl616_wifi).
 - msh support with lsusb
-
+- device char support with host cdc_acm/ftdi/ch34x/cp210x/pl2303
+- shell support with adb
 
 ## Nuttx
 

platform/rtthread/usb_check.c

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2022 ~ 2025, sakumisu
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
 #include "rtthread.h"
 #include "usb_config.h"
 

platform/rtthread/usbd_adb_shell.c

@@ -0,0 +1,156 @@
+/*
+ * Copyright (c) 2025, sakumisu
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <rtthread.h>
+#include <rtdevice.h>
+
+#include "usbd_core.h"
+#include "usbd_adb.h"
+
+#ifndef CONFIG_USBDEV_SHELL_RX_BUFSIZE
+#define CONFIG_USBDEV_SHELL_RX_BUFSIZE (2048)
+#endif
+
+struct usbd_adb_shell {
+    struct rt_device parent;
+    usb_osal_sem_t tx_done;
+    struct rt_ringbuffer rx_rb;
+    rt_uint8_t rx_rb_buffer[CONFIG_USBDEV_SHELL_RX_BUFSIZE];
+} g_usbd_adb_shell;
+
+void usbd_adb_notify_shell_read(uint8_t *data, uint32_t len)
+{
+    rt_ringbuffer_put(&g_usbd_adb_shell.rx_rb, data, len);
+
+    if (g_usbd_adb_shell.parent.rx_indicate) {
+        g_usbd_adb_shell.parent.rx_indicate(&g_usbd_adb_shell.parent, len);
+    }
+}
+
+void usbd_adb_notify_write_done(void)
+{
+    if (g_usbd_adb_shell.tx_done) {
+        usb_osal_sem_give(g_usbd_adb_shell.tx_done);
+    }
+}
+
+static rt_err_t usbd_adb_shell_open(struct rt_device *dev, rt_uint16_t oflag)
+{
+    while (!usb_device_is_configured(0)) {
+        rt_thread_mdelay(10);
+    }
+    return RT_EOK;
+}
+
+static rt_err_t usbd_adb_shell_close(struct rt_device *dev)
+{
+    if (g_usbd_adb_shell.tx_done) {
+        usb_osal_sem_give(g_usbd_adb_shell.tx_done);
+    }
+
+    return RT_EOK;
+}
+
+static rt_ssize_t usbd_adb_shell_read(struct rt_device *dev,
+                                      rt_off_t pos,
+                                      void *buffer,
+                                      rt_size_t size)
+{
+    return rt_ringbuffer_get(&g_usbd_adb_shell.rx_rb, (rt_uint8_t *)buffer, size);
+}
+
+static rt_ssize_t usbd_adb_shell_write(struct rt_device *dev,
+                                       rt_off_t pos,
+                                       const void *buffer,
+                                       rt_size_t size)
+{
+    int ret = 0;
+
+    RT_ASSERT(dev != RT_NULL);
+
+    if (!usb_device_is_configured(0)) {
+        return size;
+    }
+
+    if (usbd_adb_can_write() && size) {
+        usb_osal_sem_reset(g_usbd_adb_shell.tx_done);
+        usbd_abd_write(ADB_SHELL_LOALID, buffer, size);
+        usb_osal_sem_take(g_usbd_adb_shell.tx_done, 0xffffffff);
+    }
+
+    return size;
+}
+
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops usbd_adb_shell_ops = {
+    NULL,
+    usbd_adb_shell_open,
+    usbd_adb_shell_close,
+    usbd_adb_shell_read,
+    usbd_adb_shell_write,
+    NULL
+};
+#endif
+
+void usbd_adb_shell_init(uint8_t in_ep, uint8_t out_ep)
+{
+    rt_err_t ret;
+    struct rt_device *device;
+
+    device = &(g_usbd_adb_shell.parent);
+
+    device->type = RT_Device_Class_Char;
+    device->rx_indicate = RT_NULL;
+    device->tx_complete = RT_NULL;
+
+#ifdef RT_USING_DEVICE_OPS
+    device->ops = &usbd_adb_shell_ops;
+#else
+    device->init = NULL;
+    device->open = usbd_adb_shell_open;
+    device->close = usbd_adb_shell_close;
+    device->read = usbd_adb_shell_read;
+    device->write = usbd_adb_shell_write;
+    device->control = NULL;
+#endif
+    device->user_data = NULL;
+
+    /* register a character device */
+    ret = rt_device_register(device, "adb-sh", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE);
+
+#ifdef RT_USING_POSIX_DEVIO
+    /* set fops */
+    device->fops = NULL;
+#endif
+
+    g_usbd_adb_shell.tx_done = usb_osal_sem_create(0);
+    rt_ringbuffer_init(&g_usbd_adb_shell.rx_rb, g_usbd_adb_shell.rx_rb_buffer, sizeof(g_usbd_adb_shell.rx_rb_buffer));
+}
+
+static int adb_enter(int argc, char **argv)
+{
+    (void)argc;
+    (void)argv;
+
+    finsh_set_device("adb-sh");
+    rt_console_set_device("adb-sh");
+
+    return 0;
+}
+MSH_CMD_EXPORT(adb_enter, adb_enter);
+
+static int adb_exit(int argc, char **argv)
+{
+    (void)argc;
+    (void)argv;
+
+    usbd_adb_close(ADB_SHELL_LOALID);
+
+    finsh_set_device(RT_CONSOLE_DEVICE_NAME);
+    rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
+
+    return 0;
+}
+MSH_CMD_EXPORT(adb_exit, adb_exit);

platform/rtthread/usbh_dfs.c

@@ -38,7 +38,7 @@ static ssize_t rt_udisk_read(rt_device_t dev, rt_off_t pos, void *buffer,
     rt_uint8_t *align_buf;
 
     align_buf = (rt_uint8_t *)buffer;
-#ifdef RT_USING_CACHE
+#ifdef CONFIG_USB_DCACHE_ENABLE
     if ((uint32_t)buffer & (CONFIG_USB_ALIGN_SIZE - 1)) {
         align_buf = rt_malloc_align(size * msc_class->blocksize, CONFIG_USB_ALIGN_SIZE);
         if (!align_buf) {
@@ -53,7 +53,7 @@ static ssize_t rt_udisk_read(rt_device_t dev, rt_off_t pos, void *buffer,
         rt_kprintf("usb mass_storage read failed\n");
         return 0;
     }
-#ifdef RT_USING_CACHE
+#ifdef CONFIG_USB_DCACHE_ENABLE
     if ((uint32_t)buffer & (CONFIG_USB_ALIGN_SIZE - 1)) {
         usb_memcpy(buffer, align_buf, size * msc_class->blocksize);
         rt_free_align(align_buf);
@@ -70,7 +70,7 @@ static ssize_t rt_udisk_write(rt_device_t dev, rt_off_t pos, const void *buffer,
     rt_uint8_t *align_buf;
 
     align_buf = (rt_uint8_t *)buffer;
-#ifdef RT_USING_CACHE
+#ifdef CONFIG_USB_DCACHE_ENABLE
     if ((uint32_t)buffer & (CONFIG_USB_ALIGN_SIZE - 1)) {
         align_buf = rt_malloc_align(size * msc_class->blocksize, CONFIG_USB_ALIGN_SIZE);
         if (!align_buf) {
@@ -86,7 +86,7 @@ static ssize_t rt_udisk_write(rt_device_t dev, rt_off_t pos, const void *buffer,
         rt_kprintf("usb mass_storage write failed\n");
         return 0;
     }
-#ifdef RT_USING_CACHE
+#ifdef CONFIG_USB_DCACHE_ENABLE
     if ((uint32_t)buffer & (CONFIG_USB_ALIGN_SIZE - 1)) {
         rt_free_align(align_buf);
     }

platform/rtthread/usbh_serial.c

@@ -0,0 +1,919 @@
+/*
+ * Copyright (c) 2025, sakumisu
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#include <rtthread.h>
+#include <rtdevice.h>
+
+#include "usbh_core.h"
+#include "usbh_cdc_acm.h"
+#include "usbh_ftdi.h"
+#include "usbh_cp210x.h"
+#include "usbh_ch34x.h"
+#include "usbh_pl2303.h"
+
+#define DEV_FORMAT_VENDOR  "ttyUSB%d"
+#define DEV_FORMAT_CDC_ACM "ttyACM%d"
+
+#define USBH_RX_MAX_SIZE 2048
+
+#ifndef CONFIG_USBHOST_MAX_VENDOR_SERIAL_CLASS
+#define CONFIG_USBHOST_MAX_VENDOR_SERIAL_CLASS (4)
+#endif
+
+#ifndef CONFIG_USBHOST_SERIAL_RX_BUFSIZE
+#define CONFIG_USBHOST_SERIAL_RX_BUFSIZE (USBH_RX_MAX_SIZE * 2)
+#endif
+
+enum usbh_serial_type {
+    USBH_SERIAL_TYPE_CDC_ACM = 0,
+    USBH_SERIAL_TYPE_FTDI,
+    USBH_SERIAL_TYPE_CP210X,
+    USBH_SERIAL_TYPE_CH34X,
+    USBH_SERIAL_TYPE_PL2303,
+};
+
+struct usbh_serial {
+    struct rt_device parent;
+    enum usbh_serial_type type;
+    uint8_t minor;
+    char name[CONFIG_USBHOST_DEV_NAMELEN];
+    struct rt_ringbuffer rx_rb;
+    rt_uint8_t rx_rb_buffer[CONFIG_USBHOST_SERIAL_RX_BUFSIZE];
+};
+
+static uint32_t g_devinuse_vendor = 0;
+static uint32_t g_devinuse_cdc_acm = 0;
+
+static USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t g_usbh_serial_vendor_rx_buf[CONFIG_USBHOST_MAX_VENDOR_SERIAL_CLASS][USB_ALIGN_UP(USBH_RX_MAX_SIZE, CONFIG_USB_ALIGN_SIZE)];
+static USB_NOCACHE_RAM_SECTION USB_MEM_ALIGNX uint8_t g_usbh_serial_cdc_acm_rx_buf[CONFIG_USBHOST_MAX_CDC_ACM_CLASS][USB_ALIGN_UP(USBH_RX_MAX_SIZE, CONFIG_USB_ALIGN_SIZE)];
+
+static struct usbh_serial *usbh_serial_alloc(uint8_t type)
+{
+    uint8_t devno;
+    struct usbh_serial *serial;
+
+    for (devno = 0; devno < CONFIG_USBHOST_MAX_VENDOR_SERIAL_CLASS; devno++) {
+        if ((g_devinuse_vendor & (1U << devno)) == 0) {
+            g_devinuse_vendor |= (1U << devno);
+
+            serial = rt_malloc(sizeof(struct usbh_serial));
+            memset(serial, 0, sizeof(struct usbh_serial));
+            serial->type = type;
+            serial->minor = devno;
+            snprintf(serial->name, CONFIG_USBHOST_DEV_NAMELEN, DEV_FORMAT_VENDOR, serial->minor);
+            return serial;
+        }
+    }
+    return NULL;
+}
+
+static void usbh_serial_free(struct usbh_serial *serial)
+{
+    uint8_t devno = serial->minor;
+
+    if (devno < 32) {
+        g_devinuse_vendor &= ~(1U << devno);
+    }
+    memset(serial, 0, sizeof(struct usbh_serial));
+    rt_free(serial);
+}
+
+static struct usbh_serial *usbh_serial_cdc_acm_alloc(uint8_t type)
+{
+    uint8_t devno;
+    struct usbh_serial *serial;
+
+    for (devno = 0; devno < CONFIG_USBHOST_MAX_CDC_ACM_CLASS; devno++) {
+        if ((g_devinuse_cdc_acm & (1U << devno)) == 0) {
+            g_devinuse_cdc_acm |= (1U << devno);
+
+            serial = rt_malloc(sizeof(struct usbh_serial));
+            memset(serial, 0, sizeof(struct usbh_serial));
+            serial->type = type;
+            serial->minor = devno;
+            snprintf(serial->name, CONFIG_USBHOST_DEV_NAMELEN, DEV_FORMAT_CDC_ACM, serial->minor);
+            return serial;
+        }
+    }
+    return NULL;
+}
+
+static void usbh_serial_cdc_acm_free(struct usbh_serial *serial)
+{
+    uint8_t devno = serial->minor;
+
+    if (devno < 32) {
+        g_devinuse_cdc_acm &= ~(1U << devno);
+    }
+    memset(serial, 0, sizeof(struct usbh_serial));
+    rt_free(serial);
+}
+
+static rt_err_t usbh_serial_open(struct rt_device *dev, rt_uint16_t oflag)
+{
+    struct usbh_serial *serial;
+    struct usbh_cdc_acm *cdc_acm_class;
+
+    RT_ASSERT(dev != RT_NULL);
+
+    serial = (struct usbh_serial *)dev;
+    cdc_acm_class = (struct usbh_cdc_acm *)dev->user_data;
+
+    switch (serial->type) {
+        case USBH_SERIAL_TYPE_CDC_ACM:
+            break;
+        case USBH_SERIAL_TYPE_FTDI:
+            break;
+        case USBH_SERIAL_TYPE_CP210X:
+            break;
+        case USBH_SERIAL_TYPE_CH34X:
+            break;
+        case USBH_SERIAL_TYPE_PL2303:
+            break;
+
+        default:
+            break;
+    }
+
+    return RT_EOK;
+}
+
+static rt_err_t usbh_serial_close(struct rt_device *dev)
+{
+    struct usbh_serial *serial;
+    struct usbh_cdc_acm *cdc_acm_class;
+
+    RT_ASSERT(dev != RT_NULL);
+
+    serial = (struct usbh_serial *)dev;
+    cdc_acm_class = (struct usbh_cdc_acm *)dev->user_data;
+
+    switch (serial->type) {
+        case USBH_SERIAL_TYPE_CDC_ACM:
+            break;
+        case USBH_SERIAL_TYPE_FTDI:
+            break;
+        case USBH_SERIAL_TYPE_CP210X:
+            break;
+        case USBH_SERIAL_TYPE_CH34X:
+            break;
+        case USBH_SERIAL_TYPE_PL2303:
+            break;
+
+        default:
+            break;
+    }
+
+    return RT_EOK;
+}
+
+static rt_ssize_t usbh_serial_read(struct rt_device *dev,
+                                   rt_off_t pos,
+                                   void *buffer,
+                                   rt_size_t size)
+{
+    struct usbh_serial *serial;
+    struct usbh_cdc_acm *cdc_acm_class;
+
+    RT_ASSERT(dev != RT_NULL);
+
+    serial = (struct usbh_serial *)dev;
+
+    return rt_ringbuffer_get(&serial->rx_rb, (rt_uint8_t *)buffer, size);
+}
+
+static rt_ssize_t usbh_serial_write(struct rt_device *dev,
+                                    rt_off_t pos,
+                                    const void *buffer,
+                                    rt_size_t size)
+{
+    struct usbh_serial *serial;
+    int ret = 0;
+    rt_uint8_t *align_buf;
+
+    RT_ASSERT(dev != RT_NULL);
+
+    serial = (struct usbh_serial *)dev;
+
+    align_buf = (rt_uint8_t *)buffer;
+#ifdef RT_USING_CACHE
+    if ((uint32_t)buffer & (CONFIG_USB_ALIGN_SIZE - 1)) {
+        align_buf = rt_malloc_align(size, CONFIG_USB_ALIGN_SIZE);
+        if (!align_buf) {
+            USB_LOG_ERR("serial get align buf failed\n");
+            return 0;
+        }
+
+        usb_memcpy(align_buf, buffer, size);
+    }
+#endif
+
+    switch (serial->type) {
+#if defined(PKG_CHERRYUSB_HOST_CDC_ACM) || defined(RT_CHERRYUSB_HOST_CDC_ACM)
+        case USBH_SERIAL_TYPE_CDC_ACM:
+            ret = usbh_cdc_acm_bulk_out_transfer((struct usbh_cdc_acm *)dev->user_data, (uint8_t *)align_buf, size, RT_WAITING_FOREVER);
+            if (ret < 0) {
+                USB_LOG_ERR("usbh_cdc_acm_bulk_out_transfer failed: %d\n", ret);
+#ifdef CONFIG_USB_DCACHE_ENABLE
+                rt_free_align(align_buf);
+#endif
+                return 0;
+            }
+            break;
+#endif
+#if defined(PKG_CHERRYUSB_HOST_FTDI) || defined(RT_CHERRYUSB_HOST_FTDI)
+        case USBH_SERIAL_TYPE_FTDI:
+            ret = usbh_ftdi_bulk_out_transfer((struct usbh_ftdi *)dev->user_data, (uint8_t *)align_buf, size, RT_WAITING_FOREVER);
+            if (ret < 0) {
+                USB_LOG_ERR("usbh_ftdi_bulk_out_transfer failed: %d\n", ret);
+#ifdef CONFIG_USB_DCACHE_ENABLE
+                rt_free_align(align_buf);
+#endif
+                return 0;
+            }
+            break;
+#endif
+#if defined(PKG_CHERRYUSB_HOST_CH34X) || defined(RT_CHERRYUSB_HOST_CH34X)
+        case USBH_SERIAL_TYPE_CH34X:
+            ret = usbh_ch34x_bulk_out_transfer((struct usbh_ch34x *)dev->user_data, (uint8_t *)align_buf, size, RT_WAITING_FOREVER);
+            if (ret < 0) {
+                USB_LOG_ERR("usbh_ch34x_bulk_out_transfer failed: %d\n", ret);
+#ifdef CONFIG_USB_DCACHE_ENABLE
+                rt_free_align(align_buf);
+#endif
+                return 0;
+            }
+            break;
+#endif
+#if defined(PKG_CHERRYUSB_HOST_PL2303) || defined(RT_CHERRYUSB_HOST_PL2303)
+        case USBH_SERIAL_TYPE_PL2303:
+            ret = usbh_pl2303_bulk_out_transfer((struct usbh_pl2303 *)dev->user_data, (uint8_t *)align_buf, size, RT_WAITING_FOREVER);
+            if (ret < 0) {
+                USB_LOG_ERR("usbh_pl2303_bulk_out_transfer failed: %d\n", ret);
+#ifdef CONFIG_USB_DCACHE_ENABLE
+                rt_free_align(align_buf);
+#endif
+                return 0;
+            }
+            break;
+#endif
+        default:
+            break;
+    }
+
+#ifdef CONFIG_USB_DCACHE_ENABLE
+    if ((uint32_t)buffer & (CONFIG_USB_ALIGN_SIZE - 1)) {
+        rt_free_align(align_buf);
+    }
+#endif
+
+    return ret;
+}
+
+static rt_err_t usbh_serial_control(struct rt_device *dev,
+                                    int cmd,
+                                    void *args)
+{
+    struct usbh_serial *serial;
+    struct serial_configure *config;
+    struct cdc_line_coding line_coding;
+    int ret = RT_EINVAL;
+
+    RT_ASSERT(dev != RT_NULL);
+
+    serial = (struct usbh_serial *)dev;
+
+    switch (serial->type) {
+#if defined(PKG_CHERRYUSB_HOST_CDC_ACM) || defined(RT_CHERRYUSB_HOST_CDC_ACM)
+        case USBH_SERIAL_TYPE_CDC_ACM:
+            if (cmd == RT_DEVICE_CTRL_CONFIG) {
+                struct usbh_cdc_acm *cdc_acm_class;
+                cdc_acm_class = (struct usbh_cdc_acm *)dev->user_data;
+
+                config = (struct serial_configure *)args;
+
+                line_coding.dwDTERate = config->baud_rate;
+                line_coding.bDataBits = config->data_bits;
+                line_coding.bCharFormat = 0; // STOP_BITS_1
+                line_coding.bParityType = config->parity;
+
+                usbh_cdc_acm_set_line_coding(cdc_acm_class, &line_coding);
+            }
+
+            ret = RT_EOK;
+            break;
+#endif
+#if defined(PKG_CHERRYUSB_HOST_FTDI) || defined(RT_CHERRYUSB_HOST_FTDI)
+        case USBH_SERIAL_TYPE_FTDI:
+            if (cmd == RT_DEVICE_CTRL_CONFIG) {
+                struct usbh_ftdi *ftdi_class;
+                ftdi_class = (struct usbh_ftdi *)dev->user_data;
+
+                config = (struct serial_configure *)args;
+
+                line_coding.dwDTERate = config->baud_rate;
+                line_coding.bDataBits = config->data_bits;
+                line_coding.bCharFormat = 0; // STOP_BITS_1
+                line_coding.bParityType = config->parity;
+
+                usbh_ftdi_set_line_coding(ftdi_class, &line_coding);
+            }
+
+            ret = RT_EOK;
+            break;
+#endif
+#if defined(PKG_CHERRYUSB_HOST_CP210X) || defined(RT_CHERRYUSB_HOST_CP210X)
+        case USBH_SERIAL_TYPE_CP210X:
+            if (cmd == RT_DEVICE_CTRL_CONFIG) {
+                struct usbh_cp210x *cp210x_class;
+                cp210x_class = (struct usbh_cp210x *)dev->user_data;
+
+                config = (struct serial_configure *)args;
+
+                line_coding.dwDTERate = config->baud_rate;
+                line_coding.bDataBits = config->data_bits;
+                line_coding.bCharFormat = 0; // STOP_BITS_1
+                line_coding.bParityType = config->parity;
+
+                usbh_cp210x_set_line_coding(cp210x_class, &line_coding);
+            }
+
+            ret = RT_EOK;
+            break;
+#endif
+#if defined(PKG_CHERRYUSB_HOST_CH34X) || defined(RT_CHERRYUSB_HOST_CH34X)
+        case USBH_SERIAL_TYPE_CH34X:
+            if (cmd == RT_DEVICE_CTRL_CONFIG) {
+                struct usbh_ch34x *ch34x_class;
+                ch34x_class = (struct usbh_ch34x *)dev->user_data;
+
+                config = (struct serial_configure *)args;
+
+                line_coding.dwDTERate = config->baud_rate;
+                line_coding.bDataBits = config->data_bits;
+                line_coding.bCharFormat = 0; // STOP_BITS_1
+                line_coding.bParityType = config->parity;
+
+                usbh_ch34x_set_line_coding(ch34x_class, &line_coding);
+            }
+
+            ret = RT_EOK;
+            break;
+#endif
+#if defined(PKG_CHERRYUSB_HOST_PL2303) || defined(RT_CHERRYUSB_HOST_PL2303)
+        case USBH_SERIAL_TYPE_PL2303:
+            if (cmd == RT_DEVICE_CTRL_CONFIG) {
+                struct usbh_pl2303 *pl2303_class;
+                pl2303_class = (struct usbh_pl2303 *)dev->user_data;
+
+                config = (struct serial_configure *)args;
+
+                line_coding.dwDTERate = config->baud_rate;
+                line_coding.bDataBits = config->data_bits;
+                line_coding.bCharFormat = 0; // STOP_BITS_1
+                line_coding.bParityType = config->parity;
+
+                usbh_pl2303_set_line_coding(pl2303_class, &line_coding);
+            }
+
+            ret = RT_EOK;
+            break;
+#endif
+        default:
+            break;
+    }
+
+    return RT_EINVAL;
+}
+
+#ifdef RT_USING_DEVICE_OPS
+const static struct rt_device_ops usbh_serial_ops = {
+    NULL,
+    usbh_serial_open,
+    usbh_serial_close,
+    usbh_serial_read,
+    usbh_serial_write,
+    usbh_serial_control
+};
+#endif
+
+#ifdef RT_USING_POSIX_DEVIO
+#include <unistd.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <sys/ioctl.h>
+#include <dfs_file.h>
+
+#ifdef RT_USING_POSIX_TERMIOS
+#include <termios.h>
+#endif
+
+static rt_err_t usbh_serial_fops_rx_ind(rt_device_t dev, rt_size_t size)
+{
+    rt_wqueue_wakeup(&(dev->wait_queue), (void*)POLLIN);
+
+    return RT_EOK;
+}
+
+/* fops for serial */
+static int usbh_serial_fops_open(struct dfs_file *fd)
+{
+    rt_err_t ret = 0;
+    rt_uint16_t flags = 0;
+    rt_device_t device;
+
+    device = (rt_device_t)fd->vnode->data;
+    RT_ASSERT(device != RT_NULL);
+
+    switch (fd->flags & O_ACCMODE)
+    {
+    case O_RDONLY:
+        USB_LOG_DBG("fops open: O_RDONLY!");
+        flags = RT_DEVICE_FLAG_RDONLY;
+        break;
+    case O_WRONLY:
+        USB_LOG_DBG("fops open: O_WRONLY!");
+        flags = RT_DEVICE_FLAG_WRONLY;
+        break;
+    case O_RDWR:
+        USB_LOG_DBG("fops open: O_RDWR!");
+        flags = RT_DEVICE_FLAG_RDWR;
+        break;
+    default:
+        USB_LOG_ERR("fops open: unknown mode - %d!", fd->flags & O_ACCMODE);
+        break;
+    }
+
+    if ((fd->flags & O_ACCMODE) != O_WRONLY)
+        rt_device_set_rx_indicate(device, usbh_serial_fops_rx_ind);
+    ret = rt_device_open(device, flags);
+    if (ret == RT_EOK) return 0;
+
+    return ret;
+}
+
+static int usbh_serial_fops_close(struct dfs_file *fd)
+{
+    rt_device_t device;
+
+    device = (rt_device_t)fd->vnode->data;
+
+    rt_device_set_rx_indicate(device, RT_NULL);
+    rt_device_close(device);
+
+    return 0;
+}
+
+static int usbh_serial_fops_ioctl(struct dfs_file *fd, int cmd, void *args)
+{
+    rt_device_t device;
+    int flags = (int)(rt_base_t)args;
+    int mask  = O_NONBLOCK | O_APPEND;
+
+    device = (rt_device_t)fd->vnode->data;
+    switch (cmd)
+    {
+    case FIONREAD:
+        break;
+    case FIONWRITE:
+        break;
+    case F_SETFL:
+        flags &= mask;
+        fd->flags &= ~mask;
+        fd->flags |= flags;
+        break;
+    }
+
+    return rt_device_control(device, cmd, args);
+}
+
+static int usbh_serial_fops_read(struct dfs_file *fd, void *buf, size_t count)
+{
+    int size = 0;
+    rt_device_t device;
+
+    device = (rt_device_t)fd->vnode->data;
+
+    do
+    {
+        size = rt_device_read(device, -1,  buf, count);
+        if (size <= 0)
+        {
+            if (fd->flags & O_NONBLOCK)
+            {
+                size = -EAGAIN;
+                break;
+            }
+
+            rt_wqueue_wait(&(device->wait_queue), 0, RT_WAITING_FOREVER);
+        }
+    }while (size <= 0);
+
+    return size;
+}
+
+static int usbh_serial_fops_write(struct dfs_file *fd, const void *buf, size_t count)
+{
+    rt_device_t device;
+
+    device = (rt_device_t)fd->vnode->data;
+    return rt_device_write(device, -1, buf, count);
+}
+
+static int usbh_serial_fops_poll(struct dfs_file *fd, struct rt_pollreq *req)
+{
+    int mask = 0;
+    int flags = 0;
+    rt_device_t device;
+    struct usbh_serial *serial;
+
+    device = (rt_device_t)fd->vnode->data;
+    RT_ASSERT(device != RT_NULL);
+
+    serial = (struct usbh_serial *)device;
+
+    /* only support POLLIN */
+    flags = fd->flags & O_ACCMODE;
+    if (flags == O_RDONLY || flags == O_RDWR)
+    {
+        rt_base_t level;
+
+        rt_poll_add(&(device->wait_queue), req);
+
+        level = rt_hw_interrupt_disable();
+
+        if (rt_ringbuffer_data_len(&serial->rx_rb))
+            mask |= POLLIN;
+        rt_hw_interrupt_enable(level);
+    }
+    // mask|=POLLOUT;
+   return mask;
+}
+
+const static struct dfs_file_ops usbh_serial_fops =
+{
+    usbh_serial_fops_open,
+    usbh_serial_fops_close,
+    usbh_serial_fops_ioctl,
+    usbh_serial_fops_read,
+    usbh_serial_fops_write,
+    RT_NULL, /* flush */
+    RT_NULL, /* lseek */
+    RT_NULL, /* getdents */
+    usbh_serial_fops_poll,
+};
+#endif /* RT_USING_POSIX_DEVIO */
+
+rt_err_t usbh_serial_register(struct usbh_serial *serial,
+                              void *data)
+{
+    rt_err_t ret;
+    struct rt_device *device;
+    RT_ASSERT(serial != RT_NULL);
+
+    device = &(serial->parent);
+
+    device->type = RT_Device_Class_Char;
+    device->rx_indicate = RT_NULL;
+    device->tx_complete = RT_NULL;
+
+#ifdef RT_USING_DEVICE_OPS
+    device->ops = &usbh_serial_ops;
+#else
+    device->init = NULL;
+    device->open = usbh_serial_open;
+    device->close = usbh_serial_close;
+    device->read = usbh_serial_read;
+    device->write = usbh_serial_write;
+    device->control = usbh_serial_control;
+#endif
+    device->user_data = data;
+
+    /* register a character device */
+    ret = rt_device_register(device, serial->name, RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE);
+
+#ifdef RT_USING_POSIX_DEVIO
+    /* set fops */
+    device->fops = &usbh_serial_fops;
+#endif
+    rt_ringbuffer_init(&serial->rx_rb, serial->rx_rb_buffer, sizeof(serial->rx_rb_buffer));
+
+    return ret;
+}
+
+void usbh_serial_unregister(struct usbh_serial *serial)
+{
+    RT_ASSERT(serial != NULL);
+
+    rt_device_unregister(&serial->parent);
+
+    if (serial->type == USBH_SERIAL_TYPE_CDC_ACM) {
+        usbh_serial_cdc_acm_free(serial);
+    } else {
+        usbh_serial_free(serial);
+    }
+}
+
+#if defined(PKG_CHERRYUSB_HOST_CDC_ACM) || defined(RT_CHERRYUSB_HOST_CDC_ACM)
+void usbh_cdc_acm_callback(void *arg, int nbytes)
+{
+    struct usbh_cdc_acm *cdc_acm_class = (struct usbh_cdc_acm *)arg;
+    struct usbh_serial *serial;
+    int ret;
+    struct usbh_urb *urb = &cdc_acm_class->bulkin_urb;
+
+    if (nbytes > 0) {
+        serial = (struct usbh_serial *)cdc_acm_class->user_data;
+        rt_ringbuffer_put(&serial->rx_rb, g_usbh_serial_cdc_acm_rx_buf[serial->minor], nbytes);
+
+        if (serial->parent.rx_indicate) {
+            serial->parent.rx_indicate(&serial->parent, nbytes);
+        }
+
+        usbh_bulk_urb_fill(urb, cdc_acm_class->hport, cdc_acm_class->bulkin, g_usbh_serial_cdc_acm_rx_buf[serial->minor], sizeof(g_usbh_serial_cdc_acm_rx_buf[serial->minor]), 0, usbh_cdc_acm_callback, cdc_acm_class);
+        ret = usbh_submit_urb(urb);
+        if (ret < 0) {
+            USB_LOG_ERR("usbh_submit_urb failed: %d\n", ret);
+        }
+    }
+}
+
+void usbh_cdc_acm_run(struct usbh_cdc_acm *cdc_acm_class)
+{
+    struct usbh_serial *serial;
+    int ret;
+    struct usbh_urb *urb = &cdc_acm_class->bulkin_urb;
+
+    serial = usbh_serial_cdc_acm_alloc(USBH_SERIAL_TYPE_CDC_ACM);
+    cdc_acm_class->user_data = serial;
+
+    usbh_serial_register(serial, cdc_acm_class);
+
+    struct cdc_line_coding linecoding;
+    linecoding.dwDTERate = 115200;
+    linecoding.bDataBits = 8;
+    linecoding.bParityType = 0;
+    linecoding.bCharFormat = 0;
+    usbh_cdc_acm_set_line_coding(cdc_acm_class, &linecoding);
+
+    usbh_bulk_urb_fill(urb, cdc_acm_class->hport, cdc_acm_class->bulkin, g_usbh_serial_cdc_acm_rx_buf[serial->minor], sizeof(g_usbh_serial_cdc_acm_rx_buf[serial->minor]), 0, usbh_cdc_acm_callback, cdc_acm_class);
+    ret = usbh_submit_urb(urb);
+    if (ret < 0) {
+        USB_LOG_ERR("usbh_submit_urb failed: %d\n", ret);
+        usbh_serial_unregister(serial);
+        return;
+    }
+}
+
+void usbh_cdc_acm_stop(struct usbh_cdc_acm *cdc_acm_class)
+{
+    struct usbh_serial *serial;
+
+    serial = (struct usbh_serial *)cdc_acm_class->user_data;
+    usbh_serial_unregister(serial);
+}
+#endif
+
+#if defined(PKG_CHERRYUSB_HOST_FTDI) || defined(RT_CHERRYUSB_HOST_FTDI)
+void usbh_ftdi_callback(void *arg, int nbytes)
+{
+    struct usbh_ftdi *ftdi_class = (struct usbh_ftdi *)arg;
+    struct usbh_serial *serial;
+    int ret;
+    struct usbh_urb *urb = &ftdi_class->bulkin_urb;
+
+    if (nbytes >= 2) {
+        serial = (struct usbh_serial *)ftdi_class->user_data;
+
+        nbytes -= 2; // Skip the first two bytes (header)
+        rt_ringbuffer_put(&serial->rx_rb, &g_usbh_serial_vendor_rx_buf[serial->minor][2], nbytes);
+
+        if (serial->parent.rx_indicate && nbytes) {
+            serial->parent.rx_indicate(&serial->parent, nbytes);
+        }
+
+        usbh_bulk_urb_fill(urb, ftdi_class->hport, ftdi_class->bulkin, g_usbh_serial_vendor_rx_buf[serial->minor], sizeof(g_usbh_serial_vendor_rx_buf[serial->minor]), 0, usbh_ftdi_callback, ftdi_class);
+        ret = usbh_submit_urb(urb);
+        if (ret < 0) {
+            USB_LOG_ERR("usbh_submit_urb failed: %d\n", ret);
+        }
+    }
+}
+
+void usbh_ftdi_run(struct usbh_ftdi *ftdi_class)
+{
+    struct usbh_serial *serial;
+    int ret;
+    struct usbh_urb *urb = &ftdi_class->bulkin_urb;
+
+    serial = usbh_serial_alloc(USBH_SERIAL_TYPE_FTDI);
+    ftdi_class->user_data = serial;
+
+    usbh_serial_register(serial, ftdi_class);
+
+    struct cdc_line_coding linecoding;
+    linecoding.dwDTERate = 115200;
+    linecoding.bDataBits = 8;
+    linecoding.bParityType = 0;
+    linecoding.bCharFormat = 0;
+    usbh_ftdi_set_line_coding(ftdi_class, &linecoding);
+
+    usbh_bulk_urb_fill(urb, ftdi_class->hport, ftdi_class->bulkin, g_usbh_serial_vendor_rx_buf[serial->minor], sizeof(g_usbh_serial_vendor_rx_buf[serial->minor]), 0, usbh_ftdi_callback, ftdi_class);
+    ret = usbh_submit_urb(urb);
+    if (ret < 0) {
+        USB_LOG_ERR("usbh_submit_urb failed: %d\n", ret);
+        usbh_serial_unregister(serial);
+        return;
+    }
+}
+
+void usbh_ftdi_stop(struct usbh_ftdi *ftdi_class)
+{
+    struct usbh_serial *serial;
+
+    serial = (struct usbh_serial *)ftdi_class->user_data;
+    usbh_serial_unregister(serial);
+}
+#endif
+
+#if defined(PKG_CHERRYUSB_HOST_CH34X) || defined(RT_CHERRYUSB_HOST_CH34X)
+void usbh_ch34x_callback(void *arg, int nbytes)
+{
+    struct usbh_ch34x *ch34x_class = (struct usbh_ch34x *)arg;
+    struct usbh_serial *serial;
+    int ret;
+    struct usbh_urb *urb = &ch34x_class->bulkin_urb;
+
+    if (nbytes > 0) {
+        serial = (struct usbh_serial *)ch34x_class->user_data;
+        rt_ringbuffer_put(&serial->rx_rb, g_usbh_serial_vendor_rx_buf[serial->minor], nbytes);
+
+        if (serial->parent.rx_indicate) {
+            serial->parent.rx_indicate(&serial->parent, nbytes);
+        }
+
+        usbh_bulk_urb_fill(urb, ch34x_class->hport, ch34x_class->bulkin, g_usbh_serial_vendor_rx_buf[serial->minor], sizeof(g_usbh_serial_vendor_rx_buf[serial->minor]), 0, usbh_ch34x_callback, ch34x_class);
+        ret = usbh_submit_urb(urb);
+        if (ret < 0) {
+            USB_LOG_ERR("usbh_submit_urb failed: %d\n", ret);
+        }
+    }
+}
+
+void usbh_ch34x_run(struct usbh_ch34x *ch34x_class)
+{
+    struct usbh_serial *serial;
+    int ret;
+    struct usbh_urb *urb = &ch34x_class->bulkin_urb;
+
+    serial = usbh_serial_alloc(USBH_SERIAL_TYPE_CH34X);
+    ch34x_class->user_data = serial;
+
+    usbh_serial_register(serial, ch34x_class);
+
+    struct cdc_line_coding linecoding;
+    linecoding.dwDTERate = 115200;
+    linecoding.bDataBits = 8;
+    linecoding.bParityType = 0;
+    linecoding.bCharFormat = 0;
+    usbh_ch34x_set_line_coding(ch34x_class, &linecoding);
+
+    usbh_bulk_urb_fill(urb, ch34x_class->hport, ch34x_class->bulkin, g_usbh_serial_vendor_rx_buf[serial->minor], sizeof(g_usbh_serial_vendor_rx_buf[serial->minor]), 0, usbh_ch34x_callback, ch34x_class);
+    ret = usbh_submit_urb(urb);
+    if (ret < 0) {
+        USB_LOG_ERR("usbh_submit_urb failed: %d\n", ret);
+        usbh_serial_unregister(serial);
+        return;
+    }
+}
+
+void usbh_ch34x_stop(struct usbh_ch34x *ch34x_class)
+{
+    struct usbh_serial *serial;
+
+    serial = (struct usbh_serial *)ch34x_class->user_data;
+    usbh_serial_unregister(serial);
+}
+#endif
+
+#if defined(PKG_CHERRYUSB_HOST_CP210X) || defined(RT_CHERRYUSB_HOST_CP210X)
+void usbh_cp210x_callback(void *arg, int nbytes)
+{
+    struct usbh_cp210x *cp210x_class = (struct usbh_cp210x *)arg;
+    struct usbh_serial *serial;
+    int ret;
+    struct usbh_urb *urb = &cp210x_class->bulkin_urb;
+
+    if (nbytes > 0) {
+        serial = (struct usbh_serial *)cp210x_class->user_data;
+        rt_ringbuffer_put(&serial->rx_rb, g_usbh_serial_vendor_rx_buf[serial->minor], nbytes);
+
+        if (serial->parent.rx_indicate) {
+            serial->parent.rx_indicate(&serial->parent, nbytes);
+        }
+
+        usbh_bulk_urb_fill(urb, cp210x_class->hport, cp210x_class->bulkin, g_usbh_serial_vendor_rx_buf[serial->minor], sizeof(g_usbh_serial_vendor_rx_buf[serial->minor]), 0, usbh_cp210x_callback, cp210x_class);
+        ret = usbh_submit_urb(urb);
+        if (ret < 0) {
+            USB_LOG_ERR("usbh_submit_urb failed: %d\n", ret);
+        }
+    }
+}
+
+void usbh_cp210x_run(struct usbh_cp210x *cp210x_class)
+{
+    struct usbh_serial *serial;
+    int ret;
+    struct usbh_urb *urb = &cp210x_class->bulkin_urb;
+
+    serial = usbh_serial_alloc(USBH_SERIAL_TYPE_CP210X);
+    cp210x_class->user_data = serial;
+
+    usbh_serial_register(serial, cp210x_class);
+
+    struct cdc_line_coding linecoding;
+    linecoding.dwDTERate = 115200;
+    linecoding.bDataBits = 8;
+    linecoding.bParityType = 0;
+    linecoding.bCharFormat = 0;
+    usbh_cp210x_set_line_coding(cp210x_class, &linecoding);
+
+    usbh_bulk_urb_fill(urb, cp210x_class->hport, cp210x_class->bulkin, g_usbh_serial_vendor_rx_buf[serial->minor], sizeof(g_usbh_serial_vendor_rx_buf[serial->minor]), 0, usbh_cp210x_callback, cp210x_class);
+    ret = usbh_submit_urb(urb);
+    if (ret < 0) {
+        USB_LOG_ERR("usbh_submit_urb failed: %d\n", ret);
+        usbh_serial_unregister(serial);
+        return;
+    }
+}
+
+void usbh_cp210x_stop(struct usbh_cp210x *cp210x_class)
+{
+    struct usbh_serial *serial;
+
+    serial = (struct usbh_serial *)cp210x_class->user_data;
+    usbh_serial_unregister(serial);
+}
+#endif
+
+#if defined(PKG_CHERRYUSB_HOST_PL2303) || defined(RT_CHERRYUSB_HOST_PL2303)
+void usbh_pl2303_callback(void *arg, int nbytes)
+{
+    struct usbh_pl2303 *pl2303_class = (struct usbh_pl2303 *)arg;
+    struct usbh_serial *serial;
+    int ret;
+    struct usbh_urb *urb = &pl2303_class->bulkin_urb;
+
+    if (nbytes > 0) {
+        serial = (struct usbh_serial *)pl2303_class->user_data;
+        rt_ringbuffer_put(&serial->rx_rb, g_usbh_serial_vendor_rx_buf[serial->minor], nbytes);
+
+        if (serial->parent.rx_indicate) {
+            serial->parent.rx_indicate(&serial->parent, nbytes);
+        }
+
+        usbh_bulk_urb_fill(urb, pl2303_class->hport, pl2303_class->bulkin, g_usbh_serial_vendor_rx_buf[serial->minor], sizeof(g_usbh_serial_vendor_rx_buf[serial->minor]), 0, usbh_pl2303_callback, pl2303_class);
+        ret = usbh_submit_urb(urb);
+        if (ret < 0) {
+            USB_LOG_ERR("usbh_submit_urb failed: %d\n", ret);
+        }
+    }
+}
+
+void usbh_pl2303_run(struct usbh_pl2303 *pl2303_class)
+{
+    struct usbh_serial *serial;
+    int ret;
+    struct usbh_urb *urb = &pl2303_class->bulkin_urb;
+
+    serial = usbh_serial_alloc(USBH_SERIAL_TYPE_PL2303);
+    pl2303_class->user_data = serial;
+
+    usbh_serial_register(serial, pl2303_class);
+
+    struct cdc_line_coding linecoding;
+    linecoding.dwDTERate = 115200;
+    linecoding.bDataBits = 8;
+    linecoding.bParityType = 0;
+    linecoding.bCharFormat = 0;
+    usbh_pl2303_set_line_coding(pl2303_class, &linecoding);
+
+    usbh_bulk_urb_fill(urb, pl2303_class->hport, pl2303_class->bulkin, g_usbh_serial_vendor_rx_buf[serial->minor], sizeof(g_usbh_serial_vendor_rx_buf[serial->minor]), 0, usbh_pl2303_callback, pl2303_class);
+    ret = usbh_submit_urb(urb);
+    if (ret < 0) {
+        USB_LOG_ERR("usbh_submit_urb failed: %d\n", ret);
+        usbh_serial_unregister(serial);
+        return;
+    }
+}
+
+void usbh_pl2303_stop(struct usbh_pl2303 *pl2303_class)
+{
+    struct usbh_serial *serial;
+
+    serial = (struct usbh_serial *)pl2303_class->user_data;
+    usbh_serial_unregister(serial);
+}
+#endif