/* EPn */
                if (ep->direct == USB_DIR_OUT) {
                        /* OUT */
-                       if (bflag == FALSE)
+                       if (!bflag)
                                nret = _nbu2ss_epn_out_transfer(udc, ep, req);
                } else {
                        /* IN */
                if (0x0000 == (wIndex & 0xFF70)) {
                        if (selector == USB_ENDPOINT_HALT) {
                                ep_adrs = wIndex & 0xFF;
-                               if (bset == FALSE) {
+                               if (!bset) {
                                        _nbu2ss_endpoint_toggle_reset(
                                                udc, ep_adrs);
                                }
                }
        }
 
-       if (bcall_back == FALSE) {
+       if (!bcall_back) {
                if (udc->ep0state == EP0_IN_STATUS_PHASE) {
                        if (nret >= 0) {
                                /*--------------------------------------*/
 
        preq = &req->req;
 
-       if (req->dma_flag == FALSE)
+       if (!req->dma_flag)
                return;
 
        preq->actual += req->div_len;
        bflag = list_empty(&ep->queue);
        list_add_tail(&req->queue, &ep->queue);
 
-       if ((bflag != FALSE) && (ep->stalled == FALSE)) {
+       if (bflag && !ep->stalled) {
 
                result = _nbu2ss_start_transfer(udc, ep, req, FALSE);
                if (result < 0) {