Hi, I've got a board running a LPC1343 with the ROM USBHID and have a strange behaviur with the way it connect to the pc. Basically to get the USB enumerated I have to first plug in the usb connector and after power the cpu with an external 5V supply and all works good but if I unplug the usb connector and replug it in again (without cycling power or reseting the cpu) a new enumeration does not happen... I have also noticed that if I power the board with the usb 5V I have the same problem, the point is I have to give power after I plug in the usb connector.

By what I have been able to see the USB_CONNECT pin is behaving correctly because if I remove the usb connector the signal goes high and when I plug it in again the signal goes low and also my PNP transistor with the 1K5 resistor on D+ is working.

P.S. I have also tested the CDC USB driver and I have the exact same problem...

Any ideas, maybe I'm forgetting to do something in software??

Thanks.

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Hi,

Are you using the BootROM Driver or your own application code?

Have a look at the HID and MSCD code bundle examples here:

http://ics.nxp.com/support/documents/microcontrollers/zip/an10905.zip
http://ics.nxp.com/support/documents/microcontrollers/zip/an10904.zip

Good luck,
Ken
--- In l..., "faro.salvatore" wrote:
>
> Hi, I've got a board running a LPC1343 with the ROM USBHID and have a strange behaviur with the way it connect to the pc. Basically to get the USB enumerated I have to first plug in the usb connector and after power the cpu with an external 5V supply and all works good but if I unplug the usb connector and replug it in again (without cycling power or reseting the cpu) a new enumeration does not happen... I have also noticed that if I power the board with the usb 5V I have the same problem, the point is I have to give power after I plug in the usb connector.
>
> By what I have been able to see the USB_CONNECT pin is behaving correctly because if I remove the usb connector the signal goes high and when I plug it in again the signal goes low and also my PNP transistor with the 1K5 resistor on D+ is working.
>
> P.S. I have also tested the CDC USB driver and I have the exact same problem...
>
> Any ideas, maybe I'm forgetting to do something in software??
>
> Thanks.
>

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Hi,

I'm looking through the AN10904 code which is very similar to mine for HID, so far they look the same...

I'm wondering if maybe I have to set the USB port pins, pullup's, ect.. By what I have read in the datasheets the init_clk_pins() function should do it all... but for now I'm just puzzled :(

This is the usb init. code I'm using:

volatile int n;

// HID Device Info
HidDevInfo.idVendor = USB_VENDOR_ID;
HidDevInfo.idProduct = USB_PROD_ID;
HidDevInfo.bcdDevice = USB_DEVICE;
HidDevInfo.StrDescPtr = (uint32_t)&USB_HIDStringDescriptor[0];
HidDevInfo.InReportCount = 1;
HidDevInfo.OutReportCount = 1;
HidDevInfo.SampleInterval = 0x20;
HidDevInfo.InReport = usbHIDGetInReport;
HidDevInfo.OutReport = usbHIDSetOutReport;

DeviceInfo.DevType = USB_DEVICE_CLASS_HUMAN_INTERFACE;
DeviceInfo.DevDetailPtr = (uint32_t)&HidDevInfo;

/* Enable Timer32_1, IOCON, and USB blocks (for USB ROM driver) */
SCB_SYSAHBCLKCTRL |= (SCB_SYSAHBCLKCTRL_CT32B1 | SCB_SYSAHBCLKCTRL_IOCON | SCB_SYSAHBCLKCTRL_USB_REG);

/* Use pll and pin init function in rom */
(*rom)->pUSBD->init_clk_pins();

/* insert a delay between clk init and usb init */
for (n = 0; n < 75; n++) {__asm("nop");}

(*rom)->pUSBD->init(&DeviceInfo); /* USB Initialization */
(*rom)->pUSBD->connect(TRUE); /* USB Connect */
}
--- In l..., "Kenneth" wrote:
>
> Hi,
>
> Are you using the BootROM Driver or your own application code?
>
> Have a look at the HID and MSCD code bundle examples here:
>
> http://ics.nxp.com/support/documents/microcontrollers/zip/an10905.zip
> http://ics.nxp.com/support/documents/microcontrollers/zip/an10904.zip
>
> Good luck,
> Ken
> --- In l..., "faro.salvatore" wrote:
> >
> > Hi, I've got a board running a LPC1343 with the ROM USBHID and have a strange behaviur with the way it connect to the pc. Basically to get the USB enumerated I have to first plug in the usb connector and after power the cpu with an external 5V supply and all works good but if I unplug the usb connector and replug it in again (without cycling power or reseting the cpu) a new enumeration does not happen... I have also noticed that if I power the board with the usb 5V I have the same problem, the point is I have to give power after I plug in the usb connector.
> >
> > By what I have been able to see the USB_CONNECT pin is behaving correctly because if I remove the usb connector the signal goes high and when I plug it in again the signal goes low and also my PNP transistor with the 1K5 resistor on D+ is working.
> >
> > P.S. I have also tested the CDC USB driver and I have the exact same problem...
> >
> > Any ideas, maybe I'm forgetting to do something in software??
> >
> > Thanks.
>

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Does the USB VBUS actually supply power to the board? I.e. is it
connected to one of the power rails?

Mike
> -----Original Message-----
> From: l...
> [mailto:l...]On Behalf
> Of faro.salvatore
> Sent: Sunday, August 15, 2010 8:20 AM
> To: l...
> Subject: [lpc2000] LPC1343 USB hot plugging
> Hi, I've got a board running a LPC1343 with the ROM USBHID
> and have a strange behaviur with the way it connect to the
> pc. Basically to get the USB enumerated I have to first plug
> in the usb connector and after power the cpu with an external
> 5V supply and all works good but if I unplug the usb
> connector and replug it in again (without cycling power or
> reseting the cpu) a new enumeration does not happen... I have
> also noticed that if I power the board with the usb 5V I have
> the same problem, the point is I have to give power after I
> plug in the usb connector.
>
> By what I have been able to see the USB_CONNECT pin is
> behaving correctly because if I remove the usb connector the
> signal goes high and when I plug it in again the signal goes
> low and also my PNP transistor with the 1K5 resistor on D+ is working.
>
> P.S. I have also tested the CDC USB driver and I have the
> exact same problem...
>
> Any ideas, maybe I'm forgetting to do something in software??
>
> Thanks.

Start a New Thread

Hi, the USB 5V supplies a 3,3V regulator that powers the cpu. The problem is that I must power the cpu or reset it after connecting the usb cable to get it correctly working.
--- In l..., "Michael Anton" wrote:
>
> Does the USB VBUS actually supply power to the board? I.e. is it
> connected to one of the power rails?
>
> Mike
> > -----Original Message-----
> > From: l...
> > [mailto:l...]On Behalf
> > Of faro.salvatore
> > Sent: Sunday, August 15, 2010 8:20 AM
> > To: l...
> > Subject: [lpc2000] LPC1343 USB hot plugging
> >
> >
> > Hi, I've got a board running a LPC1343 with the ROM USBHID
> > and have a strange behaviur with the way it connect to the
> > pc. Basically to get the USB enumerated I have to first plug
> > in the usb connector and after power the cpu with an external
> > 5V supply and all works good but if I unplug the usb
> > connector and replug it in again (without cycling power or
> > reseting the cpu) a new enumeration does not happen... I have
> > also noticed that if I power the board with the usb 5V I have
> > the same problem, the point is I have to give power after I
> > plug in the usb connector.
> >
> > By what I have been able to see the USB_CONNECT pin is
> > behaving correctly because if I remove the usb connector the
> > signal goes high and when I plug it in again the signal goes
> > low and also my PNP transistor with the 1K5 resistor on D+ is working.
> >
> > P.S. I have also tested the CDC USB driver and I have the
> > exact same problem...
> >
> > Any ideas, maybe I'm forgetting to do something in software??
> >
> > Thanks.
>

Start a New Thread

Finally got it working, I made the necessary changes to the AN10904 code to allow compilation with crossworks and it is all good.

I still don't understand why the other code is not working?? My other code was based on the microbuilder.eu reference board software that has a crossworks project already done...

--- In l..., "faro.salvatore" wrote:
>
> Hi, the USB 5V supplies a 3,3V regulator that powers the cpu. The problem is that I must power the cpu or reset it after connecting the usb cable to get it correctly working.
> --- In l..., "Michael Anton" wrote:
> >
> > Does the USB VBUS actually supply power to the board? I.e. is it
> > connected to one of the power rails?
> >
> > Mike
> >
> >
> > > -----Original Message-----
> > > From: l...
> > > [mailto:l...]On Behalf
> > > Of faro.salvatore
> > > Sent: Sunday, August 15, 2010 8:20 AM
> > > To: l...
> > > Subject: [lpc2000] LPC1343 USB hot plugging
> > >
> > >
> > > Hi, I've got a board running a LPC1343 with the ROM USBHID
> > > and have a strange behaviur with the way it connect to the
> > > pc. Basically to get the USB enumerated I have to first plug
> > > in the usb connector and after power the cpu with an external
> > > 5V supply and all works good but if I unplug the usb
> > > connector and replug it in again (without cycling power or
> > > reseting the cpu) a new enumeration does not happen... I have
> > > also noticed that if I power the board with the usb 5V I have
> > > the same problem, the point is I have to give power after I
> > > plug in the usb connector.
> > >
> > > By what I have been able to see the USB_CONNECT pin is
> > > behaving correctly because if I remove the usb connector the
> > > signal goes high and when I plug it in again the signal goes
> > > low and also my PNP transistor with the 1K5 resistor on D+ is working.
> > >
> > > P.S. I have also tested the CDC USB driver and I have the
> > > exact same problem...
> > >
> > > Any ideas, maybe I'm forgetting to do something in software??
> > >
> > > Thanks.
>

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