diff options
| author | Keith Packard <keithp@keithp.com> | 2010-08-30 04:52:00 -0700 |
|---|---|---|
| committer | Keith Packard <keithp@keithp.com> | 2010-08-30 04:52:00 -0700 |
| commit | c7ba92317ac55272acbde12416448ebd17b983a6 (patch) | |
| tree | 38fec34856ddacd28862b935a180d54a733d2f35 /src | |
| parent | 20a472cfe3369200150ea4ff067ceb28968dbcac (diff) | |
altos: Windows sends USB Out packets of 0 length. Ack them.
This was an untested case as no other operating system sents 0-length
out packets (they're not necessary). The correct response is to ACK
them by clearing the OUTPKT_RDY bit so that another packet can be sent.
Signed-off-by: Keith Packard <keithp@keithp.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/ao_usb.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/src/ao_usb.c b/src/ao_usb.c index b55130f2..b4e3f1fe 100644 --- a/src/ao_usb.c +++ b/src/ao_usb.c @@ -383,8 +383,11 @@ ao_usb_pollchar(void) __critical if ((USBCSOL & USBCSOL_OUTPKT_RDY) == 0) return AO_READ_AGAIN; ao_usb_out_bytes = (USBCNTH << 8) | USBCNTL; - if (ao_usb_out_bytes == 0) + if (ao_usb_out_bytes == 0) { + USBINDEX = AO_USB_OUT_EP; + USBCSOL &= ~USBCSOL_OUTPKT_RDY; return AO_READ_AGAIN; + } } --ao_usb_out_bytes; c = USBFIFO[AO_USB_OUT_EP << 1]; |