disconnect USB - is it possible?

[keymuu]

Hi,
this can vary. I will reply tomorrow with a good example of how to do this unless somebody else replies first but for now look up posts from Darrell Taylor regarding the USB stuff as a hint.

Try:

    UCON.3 = 0                  ' UCON register bit 3 (USBEN) enables/disables
                                ' the USB - see page 164 18F4550 datasheeet

Thank you Rob !!!

UCON.3 ' USB Control Register, USB Module Enable Bit,0=Detached, datasheet 17.2.1
That did do the trick, nice and smooth, without any problems, without any other lines of code... very nice indeed

Totally untested thought...
what happen if you stop calling USBSERVICE?

Nothing, no dong-ding, nothing you could measure. Or maybe you can, bat because I did not hear the dong-ding I skipped rest of the "testing"...

thereafter, what may happen if you use the method shown in the famous known "POST 148"

I will take a closer look at it in the future. At the moment I'm quite happy with that one line solution...

Thank you again Rob and Mister_e thank you indeed

[Rob]

Hey Keymuu,

glad that worked for you. The stuff to read that I was going to point you to today is the post that Steve is referring to above - this will help you achieve USB enumeration correctly.

Good luck

Rob

[mister_e]

Yup, all good stuff to know. One day i may need to do it as well.

[Squibcakes]

Thank you Rob !!!

UCON.3 ' USB Control Register, USB Module Enable Bit,0=Detached, datasheet 17.2.1
That did do the trick, nice and smooth, without any problems, without any other lines of code... very nice indeed


Nothing, no dong-ding, nothing you could measure. Or maybe you can, bat because I did not hear the dong-ding I skipped rest of the "testing"...


I will take a closer look at it in the future. At the moment I'm quite happy with that one line solution...

Thank you again Rob and Mister_e thank you indeed

Guys,

Having trouble compiling UCON.3= 0

Getting a syntax error with PB2.47. Anyone else?

Squib

[FinchPJ]

Guys,

Having trouble compiling UCON.3= 0

Getting a syntax error with PB2.47. Anyone else?

Squib

I had the same problem - have now bought PBP2.6 upgrade but have not tested yet but I got around this in assembler where UCON is recognised:

            T0CON.7 = 0     ' Disable USBservice interrupts
'           UCON.1 = 1      ' UCON not defined in PBP 2.46
@	        clrf	UCON	; Disable USB & detach from bus
@	        clrf	UIE  	; Mask all USB interrupts

Peter

PS I have Timer0 running on 1 mSec interrupts - the Interrrupt handler simply doing an USBservice and returning - turned this off here also

[FinchPJ]

I have just had a chance to check this out and it works fine - add:

UCON    var byte EXT

to your PBP 2.46 program and it should solve the problem! You can now refer to for example:

       UCON.3 = 0

Peter