我在初始化的时候遇到了相同的情况，结果是下面注释掉的那一行非法访问RXFIFO引起的：USB_OTG_CoreInitHost()  /* Flush out any leftover queued requests. */  num_channels = pdev->cfg.host_channels;    for (i = 0; i < num_channels; i++)   {    USB_OTG_HCGINTMSK_TypeDef  hcintmsk;    hcchar.d32 = USB_OTG_READ_REG32(&pdev->regs.HC_REGS->HCCHAR);    hcchar.b.chen = 0;    hcchar.b.chdis = 1;    hcchar.b.epdir = 0;    USB_OTG_WRITE_REG32(&pdev->regs.HC_REGS->HCCHAR, hcchar.d32);     hcchar.d32 = USB_OTG_READ_REG32(&pdev->regs.HC_REGS->HCCHAR);    hcchar.b.chen = 1;    hcchar.b.chdis = 1;    hcchar.b.epdir = 0;    USB_OTG_WRITE_REG32(&pdev->regs.HC_REGS->HCCHAR, hcchar.d32);     do    {      //USB_OTG_READ_REG32(&pdev->regs.GREGS->GRXSTSP);      hcchar.d32 = USB_OTG_READ_REG32(&pdev->regs.HC_REGS->HCCHAR);      USB_OTG_BSP_mDelay (20);    }     while (hcchar.b.chen);    hcintmsk.d32 = USB_OTG_READ_REG32(&pdev->regs.HC_REGS->HCGINTMSK);    hcintmsk.b.chhltd = 0;    USB_OTG_WRITE_REG32(&pdev->regs.HC_REGS->HCGINTMSK , hcintmsk.d32);         /* Clear all pending HC Interrupts */    USB_OTG_WRITE_REG32( &pdev->regs.HC_REGS->HCINT, 0xFFFFFFFF );