LPC MicrocontrollersのトピックRe: Why RhPortStatus1 and RhPortStatus2 in USB

Why RhPortStatus1 and RhPortStatus2 in USB

lpcware — Wed, 15 Jun 2016 18:03:50 GMT

Content originally posted in LPCWare by jayudhandha on Thu Jan 22 22:25:31 MST 2015
Hello,

I am not able to understand the reason of RhPortStatus1 and RhPortStatus2 this two ports are used in usb interfacing. Why two?

Regards,
Jayesh dhandha

Re: Why RhPortStatus1 and RhPortStatus2 in USB

lpcware — Wed, 15 Jun 2016 18:03:51 GMT

Content originally posted in LPCWare by MikeSimmonds on Fri Jan 23 03:52:18 MST 2015
Why have your other USB Host posts disappeared -- taking my replies with them.
Did you get the document in my email?

Mike

Re: Why RhPortStatus1 and RhPortStatus2 in USB

lpcware — Wed, 15 Jun 2016 18:03:52 GMT

Content originally posted in LPCWare by MikeSimmonds on Fri Jan 23 04:07:03 MST 2015
Because the built in host controller hardware can have up to two ports.
Whether or not each possible port actually is a host port is controlled
by the setting of the PORTSEL register (Table 315 in latest UM10470)

Presumably, if a particular port is not set as host, no status change or interrupt
bits for that port will be set.

Mike.

Re: Why RhPortStatus1 and RhPortStatus2 in USB

lpcware — Wed, 15 Jun 2016 18:03:53 GMT

Content originally posted in LPCWare by jayudhandha on Sat Jan 24 00:45:49 MST 2015
Yes i got your mail. And i got the answer as well. :-)

Re: Why RhPortStatus1 and RhPortStatus2 in USB

lpcware — Wed, 15 Jun 2016 18:03:53 GMT

Content originally posted in LPCWare by jayudhandha on Sat Jan 24 02:47:21 MST 2015
Not able to understand the difference between HcDoneHead and
HccaDoneHead.