ex_usb_kbmouse : waiting for enumaration...

[NicolasC]

CCS HID Mouse/Keyboard Multiple Interface Demo
Press button to make mouse move in a circle and send an A over the keyboard
PCH: v3.249

USB connected, waiting for enumaration...
USB disconnected, waiting for connection...
USB connected, waiting for enumaration...
USB disconnected, waiting for connection...
USB connected, waiting for enumaration...
...
...

Any hint on what may be wrong ?
I'm using my own hardware with a 20MHz crystal.

Regards

[Douglas Kennedy]

1) Check you have a capacitor connected to the PIC's VUSB pin.
2) If you are using a USB sense pin check you have it wired right.

[Guest]

Thanks for your help

1) I have a 470 nF capacitor connected to the PIC's VUSB pin. May be I dhould change this to a 220nF.

2) I'm using a 18F2550, bus powered only. no sense pin.

Regards

[Douglas Kennedy]

470nf should be fine. I assume you tried rebooting your PC or have tried plugging into a different port. Start troubleshooting with a port directly connnected to your mobo before trying a remote hub. Probably your D+ and D- connections are ok and assuming you don't have the usb power bus overloaded..I think the CCS descriptor (bus power is in 2ma units) is defaulted to 50 for 100ma; it is going to be software. I use snoopypro (free download from the web) as a usb sniffer. Now if you are using a Softee OS things will be quirky. They will abort the enumeration after getting a few bytes of a perfectly good descriptor then immediately ask for it again this time accepting it. Once you are enumerated and out of the Softee woods things are very logical as far as the data flowing in the pipes.With the usb sniffer you'll see the exchange and can troubleshoot from there. Oh check the registry under HKey_LOCAL_MACHINE> SYSTEM>ControlSet001>Enum>USB to see if the VID PID you are using is
registered. If it is not it should ask you for the driver but this is a Softee OS so it may exhibit free undocumented features.
Another thing the usb section of your PIC must run at 48 Mhz so double check the divisor selection. The rest of the PIC can run at another speed entirely. I used the CCS ICDU 40 but mine is unstable at 40mhz , with my pic divisor set to give 32 Mhz and the USB section at 48Mhz it worked well.

[NicolasC]

In descriptor bus power is set to 50 for 100mA. The code comes from the examples directory and is almost unchanged.

When I plug USB connector, WinXP shows the unknown device message popup.

As my serial link for debug msg runs fine, I guess the divisor selection is not so bad :
20MHz crytal,
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN
#use delay(clock=48000000)

In the source, as I don't use sens pin,I added comment out for the following line:
// #define USB_CON_SENSE_PIN PIN_B2

Now I'm "looping" anymore, I just hang waiting for enumeration :

CCS HID Mouse/Keyboard Multiple Interface Demo
Press button to make mouse move in a circle and send an A over the keyboard
PCH: v3.249

USB connected, waiting for enumaration...

[NicolasC]

Arg !!!!!
I'm so STUPID. After checking for the xxx times I found it !!! D+ D- signal crossed in my schematic so also on the PCB.
Now it's running fine.

Thanks a lot for your help.