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样例使用说明
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Sample Description
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================================================================================
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功能描述：
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此样例演示了USB鼠标功能。
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USB鼠标主要通过USB HID类实现，将其模拟成一个USB鼠标设备。设备程序每隔1秒钟
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向主机发送一次鼠标相对位置。在PC端，您可以看到鼠标每隔1秒移动一次位置。
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Function descriptions:
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This sample demonstrates the USB mouse functionality.
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The USB mouse is mainly implemented using the USB HID class, simulating a USB
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mouse device.The device program sends the mouse relative position to the host
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every 1 second.On the PC side, you can observe the mouse moving its position
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every 1 second.
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================================================================================
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测试环境：
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测试用板：PY32F403_STK
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MDK版本： 5.28
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IAR版本： 9.20
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GCC版本：GNU Arm Embedded Toolchain 10.3-2021.10
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Test environment:
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Test board: PY32F403_STK
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MDK Version: 5.28
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IAR Version: 9.20
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GCC Version: GNU Arm Embedded Toolchain 10.3-2021.10
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================================================================================
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使用步骤：
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1. 下载并运行程序；
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2. 通过USB连接线，一端连接STK板，另一端连接PC电脑；
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3. PC端鼠标每隔1秒钟移动一次位置；
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Example execution steps:
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1. Download and run the program;
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2. Connect the STK board to the PC computer using the USB cable;
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3. The mouse position will be updated every 1 second on the PC side.
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================================================================================
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注意事项：
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1. 用户测试程序过程中，如果对USB接口进行热插拔，当重新插上USB线到PC端后，
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有可能鼠标不再移动。这是因为程序每次发送新坐标位置之前会判断上一次是否发送
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成功（检查标志位HID_STATE_BUSY）。如果热插拔过程中导致USB通讯失败一次，则
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会停止更新鼠标位置。您可以通过在程序中取消对HID_STATE_BUSY标志位的判断，即
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可实现热插拔不影响鼠标移动。
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Notes:
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1. During user testing, if the USB interface is hot-plugged, and after
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re-plugging the USB cable to the PC, the mouse movement may stop.
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This is because before sending a new mouse coordinate, the program
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checks if the previous transmission was successful (check the
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HID_STATE_BUSY flag). If there is a USB communication failure
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during the hot-plug process, it will stop updating the mouse
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position. You can implement hot-plug without affecting the mouse
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movement by removing the check for the HID_STATE_BUSY flag in
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the program.
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================================================================================
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