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-# RT-Thread package Userguide with CherryUSB
-
-[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)  --->
-```
-
-## How to use
-
-### In STM32
-
-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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