On Thu, 29 Jun 2006, JackRain wrote: > because I write the device usb firmware by myself,i print > less message only for the software flow chart. > > now: > 1)when device get READ_FORMAT_CAPCITY(0x23) command ,stall > the bulk-in endpoint. > 2)waitting for ep0setup interrupt,and get the clear_feature > request \ > unstall the endpoint and toggle the DATA pid by > disable then enable the bulk-in endpoint (isp1582)
You're supposed to set the data toggle to 0. Maybe disabling and then enabling the endpoint does that. > 3)bulk-in endpoint send a ACK signal to PC; This should not happen. The bulk-in endpoint should not send an ACK, since it has not received an IN pid. > 4)then send the CSW to PC to reflect the command status of > this unsupported command Okay. Remember to set dCSWResidue = dCBWDataTransferLength. > 5)EP0TX send a ACK signal to PC This isn't right. ep0 is supposed to send a 0-length packet to perform the handshake stage of the control message. Then the _host_ sends an ACK. > 6) bus reset. > 7)bulk-out endpoint interrypt occurs,read CBW > if command unsupported ,do the same thing 1~5; > > again bus reset. > > if command supported ,it's normal and go on processing SCSI > protocol. > and I can't see the disk tray icon on windows. > but because bus reset ,the device still won't work. Probably the bus resets occur because of the earlier protocol mistakes. Alan Stern Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
