USB_MAX_XFER_BLOCKS
i = (i + 1) % USB_MAX_XFER_BLOCKS;
i = (i + 1) % USB_MAX_XFER_BLOCKS;
if (xfer->ndata >= USB_MAX_XFER_BLOCKS)
xfer->tail = (xfer->tail + 1) % USB_MAX_XFER_BLOCKS;
struct usb_data_xfer_block data[USB_MAX_XFER_BLOCKS];
idx = (idx + 1) % USB_MAX_XFER_BLOCKS;
idx = (idx + 1) % USB_MAX_XFER_BLOCKS;