USB_DMACHCR_DE
return (chcr & (USB_DMACHCR_DE | USB_DMACHCR_TE)) == USB_DMACHCR_DE;
USB_DMACHCR_NULLE | USB_DMACHCR_IE | USB_DMACHCR_DE);
chcr &= ~(USB_DMACHCR_IE | USB_DMACHCR_TE | USB_DMACHCR_DE);
mask |= USB_DMACHCR_DE | USB_DMACHCR_TE | USB_DMACHCR_SP;
if (chcr & USB_DMACHCR_DE)