Hallo
I have a question I cant find the solution for reading the manual.
Im using a LPC2478. Im interfacing to a LCD display and therby loosing the
USB_PWRD1 and USB_OVERCR1 to LCD signals.
But is it still posiible to operate the USB host block of the LPC2478?
Is it still possible to use USB Port 1 without these signals (As far I know the
two signals is used by USB Host block)?
Something that can be done (External IC's, work arounds?) to have 2x USB
host and LCD?
/Thomas
LPC2478 with two USB host and LCD?
Started by ●April 8, 2010
Reply by ●April 8, 20102010-04-08
ostehaps01 wrote:
> I have a question I cant find the solution for reading the manual.
> Im using a LPC2478. Im interfacing to a LCD display and therby loosing
> the USB_PWRD1 and USB_OVERCR1 to LCD signals.
>
> But is it still posiible to operate the USB host block of the LPC2478?
Yes, I'm doing just that.
--
Timo
> I have a question I cant find the solution for reading the manual.
> Im using a LPC2478. Im interfacing to a LCD display and therby loosing
> the USB_PWRD1 and USB_OVERCR1 to LCD signals.
>
> But is it still posiible to operate the USB host block of the LPC2478?
Yes, I'm doing just that.
--
Timo
Reply by ●April 8, 20102010-04-08
Hallo Timo
So you are saying that USB port 1 can be operated without the USB_OVRCR1 and USN_PWRD1 signal configured and connected?
I do have problems getting the USB port 1 working. Port 2 works fine.
/thomas
--- In l..., tike64@... wrote:
>
> ostehaps01 wrote:
> > I have a question I cant find the solution for reading the manual.
> > Im using a LPC2478. Im interfacing to a LCD display and therby loosing
> > the USB_PWRD1 and USB_OVERCR1 to LCD signals.
> >
> > But is it still posiible to operate the USB host block of the LPC2478?
>
> Yes, I'm doing just that.
>
> --
>
> Timo
>
So you are saying that USB port 1 can be operated without the USB_OVRCR1 and USN_PWRD1 signal configured and connected?
I do have problems getting the USB port 1 working. Port 2 works fine.
/thomas
--- In l..., tike64@... wrote:
>
> ostehaps01 wrote:
> > I have a question I cant find the solution for reading the manual.
> > Im using a LPC2478. Im interfacing to a LCD display and therby loosing
> > the USB_PWRD1 and USB_OVERCR1 to LCD signals.
> >
> > But is it still posiible to operate the USB host block of the LPC2478?
>
> Yes, I'm doing just that.
>
> --
>
> Timo
>
Reply by ●April 8, 20102010-04-08
ostehaps01 wrote:
> So you are saying that USB port 1 can be operated without the USB_OVRCR1
> and USN_PWRD1 signal configured and connected?
Yes - definitely at least hardwarewise. I can't recall anymore, what software
hacks I had to do, but I'm definitely using USB memory sticks on USB1 and both
PWRD and OVRCR signals are used with LCD.
> I do have problems getting the USB port 1 working. Port 2 works fine.
Do you use the PWRD signal now? If I recall right, PWRD signal was actually
inverted and I got the thing (different hardware with LPC2468) working only by
not configuring the pin as PWRD. It is possible that I made a wrong conclusion
though and it may be part and revision dependent.
--
Timo
> So you are saying that USB port 1 can be operated without the USB_OVRCR1
> and USN_PWRD1 signal configured and connected?
Yes - definitely at least hardwarewise. I can't recall anymore, what software
hacks I had to do, but I'm definitely using USB memory sticks on USB1 and both
PWRD and OVRCR signals are used with LCD.
> I do have problems getting the USB port 1 working. Port 2 works fine.
Do you use the PWRD signal now? If I recall right, PWRD signal was actually
inverted and I got the thing (different hardware with LPC2468) working only by
not configuring the pin as PWRD. It is possible that I made a wrong conclusion
though and it may be part and revision dependent.
--
Timo
Reply by ●April 8, 20102010-04-08
--- In l..., tike64@... wrote:
>
> ostehaps01 wrote:
> > So you are saying that USB port 1 can be operated without the USB_OVRCR1
> > and USN_PWRD1 signal configured and connected?
>
> Yes - definitely at least hardwarewise. I can't recall anymore, what software
> hacks I had to do, but I'm definitely using USB memory sticks on USB1 and both
> PWRD and OVRCR signals are used with LCD.
>
> > I do have problems getting the USB port 1 working. Port 2 works fine.
>
> Do you use the PWRD signal now? If I recall right, PWRD signal was actually
> inverted and I got the thing (different hardware with LPC2468) working only by
> not configuring the pin as PWRD. It is possible that I made a wrong conclusion
> though and it may be part and revision dependent.
As I can see, its noted in the LPC2468 errata sheet that there is a problem with the USB_PWRDx pins, but in the errata for LPC2478 there is not?
But in host mode, what is the usage of USB_PWRDx pins? Isnt it just a port power status. So actual it isnt that importent? (Just like over current). Just for SW usage..
In device mode its the actual Vbus from the host.
thomas
>
> --
>
> Timo
>
>
> ostehaps01 wrote:
> > So you are saying that USB port 1 can be operated without the USB_OVRCR1
> > and USN_PWRD1 signal configured and connected?
>
> Yes - definitely at least hardwarewise. I can't recall anymore, what software
> hacks I had to do, but I'm definitely using USB memory sticks on USB1 and both
> PWRD and OVRCR signals are used with LCD.
>
> > I do have problems getting the USB port 1 working. Port 2 works fine.
>
> Do you use the PWRD signal now? If I recall right, PWRD signal was actually
> inverted and I got the thing (different hardware with LPC2468) working only by
> not configuring the pin as PWRD. It is possible that I made a wrong conclusion
> though and it may be part and revision dependent.
As I can see, its noted in the LPC2468 errata sheet that there is a problem with the USB_PWRDx pins, but in the errata for LPC2478 there is not?
But in host mode, what is the usage of USB_PWRDx pins? Isnt it just a port power status. So actual it isnt that importent? (Just like over current). Just for SW usage..
In device mode its the actual Vbus from the host.
thomas
>
> --
>
> Timo
>
