Do you know if it is ACCEPTABLE to turn of SOF interrupt when there is nothing to send????
a. would it stop SOF generation towards the function/device? b. can the driver turns on SOF before having something to send??? and turn if off after all ack/tarnsactions are completed???? this is to prevent loading down the cpu for those 1ms interrupt??? thanks Pei Liu wrote: > > > > >i am not sure if i understand this driver in depth.... the question > >i have is who can multiple "packets" be sent within the same frame? > > Yes, you can send multiple USB transactions within the same frame. > > > > >the interrupt service routine (hc_interrupt) seems to allow only ONE > >packet per frame? is this correct??? > > > >when xferdone is handled... the sh_done_list is called... if the > >packet is done... it would return a (-1)... and the interrupt service > >routine would not start another transaction (sh_schedule_transaction) > >if the return value is not 0.... that means no packet will go out until > >next frame? > > > > When USB Done interrupt occurred, it handles the interrupt by calling > sh_done_list() function. The sh_done_list() returns a code that determines > if the current USB transactions has completed. If it has not completed, it > would call the sh_add_packet() to complete current USB transaction. If it > has completed, then it would call the sh_schedule_trans() routine which will > schedule the next USB transactions. > > Pei ------------------------------------------------------- This SF.NET email is sponsored by: FREE SSL Guide from Thawte are you planning your Web Server Security? Click here to get a FREE Thawte SSL guide and find the answers to all your SSL security issues. http://ads.sourceforge.net/cgi-bin/redirect.pl?thaw0026en _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
