> -----Original Message----- > From: David Brownell [mailto:[EMAIL PROTECTED] > Sent: Wednesday, March 28, 2007 2:10 PM > Then badness ... the detail shown in the JPG being: > > - SETUP, ACK > - PING, ACK (*) > - write 8 bytes, NYET (**) > - IN --> STALL > > (*) This is unexpected, but likely not incorrect. Net2280 sticks > SETUP data in special registers, DATA uses the ep0 fifo, so space > availability won't be an issue. > > (**) 8.5.1 in the USB 2.0 spec says that after a NYET handshake, > "the host controller must return to using a PING token until the > endpoint indicates it has space". > > Clearly, the HDRC did not issue any PINGs ... it just went right > to the status handshake. Fishy, and quite possibly something
The PING flow-control is only for the OUT tokens. So Host should send PING only if next OUT token is to be sent. The IN token has no restriction and the device should NAK the IN token till it can process the next IN token. So the HDRC flow looks ok. Do you agree? > the net2280 interpreted as "wrong" (ergo the STALL). I'd guess > the RTL from Mentor is triggering the "tx data was ACKed" IRQ > too early ... treating the NYET as an ACK. > > > > An experiment you could try: before starting the status stage > of an ep0 OUT transfer, stick a udelay(50) or somesuch. Then > compare what the HDRC is doing. With luck, the net2280 only > cares about that illegal state in a small window, and the udelay > will get past it... > > - Dave When I enable all the logging in the code on Host side (which is lot of unnecessary logs) I see that the test case passes. I can see that for the error transactions, the IN token is rightly NAK'ed by netchip at times but never STALL'ed. > > > > > Host-MUSBHDRC sends (OUT-TOKEN) 9 bytes to Control end point. > > CATC trace attached to this mail (as jpg) shows that the Netchip gets > > the 9 bytes. > > > > Host-MUSBHDRC sends IN-token to netchip. > > > > Netchip instead of ACK/NACK, does a STALL to the IN token, which is not > > right. > > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
