__xdata uint8_t this_len;
__xdata uint8_t cs0;
+ /* If the IN packet hasn't been picked up, just return */
USBINDEX = 0;
cs0 = USBCS0;
if (cs0 & USBCS0_INPKT_RDY)
- ao_panic(0);
+ return;
this_len = ao_usb_ep0_in_len;
if (this_len > AO_USB_CONTROL_SIZE)
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];
}
char
-ao_usb_getchar(void)
+ao_usb_getchar(void) __critical
{
char c;