diff options
Diffstat (limited to 'src/ao_usb.c')
| -rw-r--r-- | src/ao_usb.c | 4 |
1 files changed, 3 insertions, 1 deletions
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]; |