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diff --git a/docs/quick_start/rt-thread/rt-thread.md b/docs/quick_start/rt-thread/rt-thread.md
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-# RT-Thread based Software Package Development Guide
-
-[中文版](rt-thread_zh.md)
-
-To use CherryUSB package, you need to select it in the RT-Thread package manager. The specific path is as follows:
-
-```
--> RT-Thread online packages
-    -> system packages
-        --- CherryUSB: tiny and portable USB stack for embedded system with USB IP
-
-            CherryUSB Options  ---->
-                    USB Speed (FS)  --->
-                    [*] Enable usb device mode
-                    [*]   Enable usb cdc acm device
-                    [ ]   Enable usb hid device
-                    [ ]   Enable usb dfu device
-                    [ ]   Enable usb msc device
-                    [ ]   Enable usb hub device
-                    [ ]   Enable usb audio device
-                    [ ]   Enable usb video device
-
-            Version (latest)  --->
-```
-
-## Based ON STM32 Platform
-
-Please note that stm32 series have two usb ip. For usb ip, like stm32f0、stm32f1、stm32f3, for usb otg ip(as we know it is from **synopsys**),like stm32f4、stm32f7 and so on.
-
-### Use USB Device
-
-- Firstly,you should have a bsp project,and then go to `board\CubeMX_Config` directory, open file that suffix name with `.ioc` in **STM32CubeMX**.
-- Enable **USB** or **USB_OTG_FS** or **USB_OTG_HS** in **Connectivity** List,enable USB IRQ in **NVIC Setting**.
-
-![STM32CubeMX USB setting](img/stm32cubemx.png)
-
-- Enable USB Clock for 48Mhz in **Clock configuration**.
-
-![STM32CubeMX USB clock](img/stm32cubemx_clk.png)
-
-- Generate code.
-- Copy **SystemClock_Config** into **board.c**.
-- ~~Copy **MX_USB_OTG_FS_PCD_Init** or **MX_USB_OTG_HS_PCD_Init** into **main.c** if you use **usb_dc_hal.c**.Also, USB Irq from **it.c** needs the same.~~
-- Implement **usb_dc_low_level_init** and copy codes in from ``HAL_PCD_MspInit``.
-
-```
-void usb_dc_low_level_init(void)
-{
-    /* Peripheral clock enable */
-    __HAL_RCC_USB_CLK_ENABLE();
-    /* USB interrupt Init */
-    HAL_NVIC_SetPriority(USB_LP_CAN1_RX0_IRQn, 0, 0);
-    HAL_NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
-
-}
-```
-
-- Implement **printf** or modify with **rt_kprintf** in **usb_utils.h**, usb stack needs.
-- Now we can call some functions provided by **usb_stack**.Your should register descriptors、interfaces and endpoint callback firstly, and then call `usb_dc_init`. Example is as follows:
-
-```
-int main(void)
-{
-    extern void cdc_init(void);
-    cdc_init();
-    usb_dc_init();
-    while (1)
-    {
-        uint8_t data_buffer[10] = { 0x31, 0x32, 0x33, 0x34, 0x35, 0x31, 0x32, 0x33, 0x34, 0x35 };
-        usbd_ep_write(0x81, data_buffer, 10, NULL);
-        rt_thread_mdelay(500);
-    }
-}
-```
-
-- How to register class you can go to [stm32 class examples](https://github.com/sakumisu/usb_stack/tree/master/demo/stm32/stm32f103c8t6/example) for a reference.
-
-### CDC Demo Demonstration
-
-![CDC Demo](img/rtt_cdc_demo.png)
-
-### Video manual
-
-If you have problem from steps above, you can see this video：[Use USB Stack in RT-Thread package manager](https://www.bilibili.com/video/BV1Ef4y1t73d?p=26)。
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diff --git a/docs/quick_start/rt-thread/rt-thread_zh.md b/docs/quick_start/rt-thread/rt-thread_zh.md
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-# 基于 RT-Thread 软件包开发指南
-
-[English Version](rt-thread.md)
-
-使用 CherryUSB package 需要在 RT-Thread 的包管理器中选择它，具体路径如下：
-
-```
--> RT-Thread online packages
-    -> system packages
-        ---  CherryUSB: tiny and portable USB stack for embedded system with USB IP
-
-            CherryUSB Options  ---->
-                    USB Speed (FS)  --->
-                    [*] Enable usb device mode
-                    [ ] Enable usb host mode
-                    [*]   Enable usb cdc acm device
-                    [ ]   Enable usb hid device
-                    [ ]   Enable usb dfu device
-                    [ ]   Enable usb msc device
-                    [ ]   Enable usb hub device
-                    [ ]   Enable usb audio device
-                    [ ]   Enable usb video device
-
-            Version (latest)  --->
-```
-
-## 基于 STM32 平台
-
-STM32 系列单片机有两种 USB IP,分别是 USB IP 和 USB OTG IP。其中 USB IP，例如 STM32F0、STM32F1、STM32F3等等，USB OTG IP(我们都知道用的是 **synopsys** 公司的)的有 STM32F4、STM32F7、STM32H7等等。当前如果你需要使用 USB Device 功能，porting 接口提供了两种，一种是适配 USB IP的 **fsdev**,另一种是适配 USB OTG IP 的 **synopsys**。
-
-### 使用 USB Device 功能
-
-- 首先，你需要有一个 bsp 工程，之后进入到 `board\CubeMX_Config` 目录下，使用 **STM32CubeMX** 打开后缀名为 `.ioc` 的文件。
-- 进入 **Connectivity** 选项，选择 **USB** 或者 **USB_OTG_FS** 或者 **USB_OTG_HS**，并使能 device 功能，在 **NVIC Setting** 中开启 USB 中断。
-
-![STM32CubeMX USB setting](img/stm32cubemx.png)
-
-- 在 **Clock configuration** 栏配置 USB 时钟为 48Mhz.
-
-![STM32CubeMX USB clock](img/stm32cubemx_clk.png)
-
-- 点击 **Generate code**。
-- 复制 **SystemClock_Config** 函数内容到 **board.c** 中。
-- 实现 ``usb_dc_low_level_init``，并将 ``HAL_PCD_MspInit`` 里面内容复制进来，例如：
-
-```
-void usb_dc_low_level_init(void)
-{
-    /* Peripheral clock enable */
-    __HAL_RCC_USB_CLK_ENABLE();
-    /* USB interrupt Init */
-    HAL_NVIC_SetPriority(USB_LP_CAN1_RX0_IRQn, 0, 0);
-    HAL_NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
-
-}
-```
-
-- 由于协议栈默认使用 `printf` 和 `malloc` 和 `free`,所以需要开启 libc 支持或者自己实现。
-![libc](img/rtt_libc.png)
-
-- 使用 **menuconfig** 配置 **CherryUSB** 软件包，使能 usb device 并勾选需要的 device class。
-![usb host](img/rtt_menuconfig1.png)
-
-- 现在我们可以调用 CherryUSB 中的函数来注册描述符、接口、端点中断，并调用 `usb_dc_init`，示例如下：
-
-```
-#include <rtthread.h>
-#include <rtdevice.h>
-#include <board.h>
-#include <stdio.h>
-
-extern void usb_dc_init(void);
-int main(void)
-{
-    extern void cdc_init(void);
-    cdc_init();
-    usb_dc_init();
-    while (1)
-    {
-        uint8_t data_buffer[10] = { 0x31, 0x32, 0x33, 0x34, 0x35, 0x31, 0x32, 0x33, 0x34, 0x35 };
-        usbd_ep_write(0x81, data_buffer, 10, NULL);
-        rt_thread_mdelay(500);
-    }
-}
-
-```
-
-- 关于如何注册 class 类可以参考 [stm32 class examples](https://github.com/sakumisu/usb_stack/tree/master/demo/stm32/stm32f103c8t6/example)。
-
-### 使用 USB Host 功能
-
-- 首先，你需要有一个 bsp 工程，之后进入到 `board\CubeMX_Config` 目录下，使用 **STM32CubeMX** 打开后缀名为 `.ioc` 的文件。
-- 进入 **Connectivity** 选项，选择 **USB_OTG_FS** 或者 **USB_OTG_HS**，并使能 **host only** 功能，在 **NVIC Setting** 中开启 OTG GLOBAL 中断，其余两个端点中断不需要。
-
-![STM32CubeMX USB setting](img/stm32cubemx2.png)
-
-- 在 **Clock configuration** 栏配置 USB 时钟为 48Mhz.
-- 点击 **Generate code**。
-- 复制 **SystemClock_Config** 函数内容到 **board.c** 中。
-- 修改 **usb_hc_synopsys.c** 中 HAL 库头文件包含，例如 `#include "stm32f4xx_hal.h"`。
-- 手动增加 **xxx_hal_hcd.c** 和 **xxx_ll_usb.c** 文件
-- 由于协议栈默认使用 `printf` 和 `malloc` 和 `free`,所以需要开启 libc 支持或者自己实现。
-![libc](img/rtt_libc.png)
-
-- 使用 **menuconfig** 配置 **CherryUSB** 软件包，使能 usb host（默认加载所有支持的 class）。
-![usb host](img/rtt_menuconfig2.png)
-
-- `main.c` 中调用 `usbh_initialize` 初始化 host 协议栈。
-
-```
-#include <rtthread.h>
-#include <rtdevice.h>
-#include <board.h>
-#include "usbh_core.h"
-/* defined the LED0 pin: PH10 */
-#define LED0_PIN    GET_PIN(H, 10)
-
-int main(void)
-{
-    /* set LED0 pin mode to output */
-    rt_pin_mode(LED0_PIN, PIN_MODE_OUTPUT);
-    usbh_initialize();
-    while (1)
-    {
-        rt_pin_write(LED0_PIN, PIN_HIGH);
-        rt_thread_mdelay(500);
-        rt_pin_write(LED0_PIN, PIN_LOW);
-        rt_thread_mdelay(500);
-    }
-}
-
-
-```
-
-### Demo 演示
-
-- cdc acm device demo
-
-![CDC Device Demo](img/rtt_cdc_demo.png)
-- host demo
-
-![USB Host Demo1](img/1.png)
-![USB Host Demo2](img/2.png)
-![USB Host Demo3](img/3.png)
-
-### 视频教程
-
-如果对上述步骤还有问题，可以参考 [协议栈在 RT-Thread 包管理器中的使用](https://www.bilibili.com/video/BV1Ef4y1t73d?p=26)。
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