CH554例程： 【EXAM_键盘鼠标多媒体自定义HID\USB\Devie\CompositeKM.C】文件中的 Fullspeed全速或低速的选择，是不是搞反了？请看下面的代码

#define Fullspeed               1

#ifdef  Fullspeed
#define THIS_ENDP0_SIZE         64
#else
#define THIS_ENDP0_SIZE         8  //低速USB，中断传输、控制传输最大包长度为8
#endif

#ifdef  Fullspeed 
    0x07,0x05,0x84,0x03,THIS_ENDP0_SIZE,0x00,0x01,              //端点描述符(全速间隔时间改成1ms)
    0x07,0x05,0x04,0x03,THIS_ENDP0_SIZE,0x00,0x01,              //端点描述符
#else
    0x07,0x05,0x84,0x03,THIS_ENDP0_SIZE,0x00,0x0A,              //端点描述符(低速间隔时间最小10ms)
    0x07,0x05,0x04,0x03,THIS_ENDP0_SIZE,0x00,0x0A              //端点描述符
#endif 

void CH554USBDevWakeup( )
{
#ifdef Fullspeed
 UDEV_CTRL |= bUD_LOW_SPEED;
 mDelaymS(2);
 UDEV_CTRL &= ~bUD_LOW_SPEED;  
#else
 UDEV_CTRL &= ~bUD_LOW_SPEED;
 mDelaymS(2);
 UDEV_CTRL |= bUD_LOW_SPEED; 
#endif
}

 IE_USB = 0;
 USB_CTRL = 0x00;                                                           // 先设定USB设备模式
 UDEV_CTRL = bUD_PD_DIS;                                                    // 禁止DP/DM下拉电阻

#ifndef Fullspeed
    UDEV_CTRL |= bUD_LOW_SPEED;                                                //选择低速1.5M模式
    USB_CTRL |= bUC_LOW_SPEED;
#else
    UDEV_CTRL &= ~bUD_LOW_SPEED;                                               //选择全速12M模式，默认方式
    USB_CTRL &= ~bUC_LOW_SPEED;
#endif

CH554.H中的定义：

#define bUD_LOW_SPEED     0x04      // enable USB physical port low speed: 0=full speed, 1=low speed

请问你是指代码哪里有问题？

 如果Fullspeed为1, 是要执行系列代码吧？
#define THIS_ENDP0_SIZE         8  //低速USB，中断传输、控制传输最大包长度为8

    0x07,0x05,0x84,0x03,THIS_ENDP0_SIZE,0x00,0x0A,              //端点描述符(低速间隔时间最小10ms)
    0x07,0x05,0x04,0x03,THIS_ENDP0_SIZE,0x00,0x0A              //端点描述符

 UDEV_CTRL &= ~bUD_LOW_SPEED;
 mDelaymS(2);
 UDEV_CTRL |= bUD_LOW_SPEED;

 UDEV_CTRL &= ~bUD_LOW_SPEED;                                               //选择全速12M模式，默认方式
 USB_CTRL &= ~bUC_LOW_SPEED;

代码前面是#ifdef  Fullspeed ，后面是#ifndef Fullspeed，你前面的看错了