X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fao_usb.c;h=527e9b302ec387355317b447c7cacad1ea926540;hb=2d77c18b15834046b7b79d49d87211828f2409e9;hp=daca71a734e911995045318b6afe802ac60b3581;hpb=ca5d323a3d206050d95f52a61e92c69e1f54e7b5;p=fw%2Faltos

diff --git a/src/ao_usb.c b/src/ao_usb.c
index daca71a7..527e9b30 100644
--- a/src/ao_usb.c
+++ b/src/ao_usb.c
@@ -377,11 +377,13 @@ char
 ao_usb_pollchar(void) __critical
 {
 	char c;
-	while (ao_usb_out_bytes == 0) {
+	if (ao_usb_out_bytes == 0) {
 		USBINDEX = AO_USB_OUT_EP;
 		if ((USBCSOL & USBCSOL_OUTPKT_RDY) == 0)
 			return AO_READ_AGAIN;
 		ao_usb_out_bytes = (USBCNTH << 8) | USBCNTL;
+		if (ao_usb_out_bytes == 0)
+			return AO_READ_AGAIN;
 	}
 	--ao_usb_out_bytes;
 	c = USBFIFO[AO_USB_OUT_EP << 1];