They both made it, but you didn't put a tag on it. I have tagged this one.


> [hope this 2nd attempt makes it]
>=20
>=20
> Hello, PIClist.
>=20
> I am trying to make a USB-connected PIC18F2553 send some kind of event
> every 30 seconds or so, to keep the screensaver on my Windows 7 PC from
> activating while idle.
>=20
> I figured the most innocuous events to send would be "volume up"
> followed by "volume down" keypresses.  I presume these key events will
> reset the screensaver timeout, and don't see them affecting much else
> that might be in the foreground.  I want to leave the device plugged in
> at all times, and mouse movements or virtually any other keypress might
> be misinterpreted depending on what I'm working on.
>=20
> I am using JALv2 and have the following code running. However the 0x80
> and 0x81 scancodes for Volume Up/Down do not seem to be recognized by
> Windows.  I have changed them to "alpha" keys and it accepts those and
> produces the characters, so I know the underlying code is working.
>=20
> The full USB HID scancode list is here:
> http://www.freebsddiary.org/APC/usb_hid_usages.php
>=20
> Anyone know how to get these events recognized, or have any other
> "innocuous key" suggestions?
>=20
> Thanks in advance for any insights!
>=20
>=20
>=20
> Joe Koberg
>=20
>=20
>=20
> ---------- JALv2 Code -----------------------
>=20
>     include 18f2553
>=20
>     pragma target PLLDIV        P1          -- divide by 1 - 4MHz crystal
>     pragma target CPUDIV        P2         -- Divide 96MHz PLL by 2 for C=
PU
>     pragma target USBPLL        F48MHZ      -- Use PLL for USB
>     pragma target OSC           XT_PLL      -- Low-speed crystal with PLL=
..
>     pragma target clock         48_000_000
>=20
>     include usb_keyboard
>=20
>     const USB_KEYBOARD_KEY_VOLUME_UP =3D 0x80
>     const USB_KEYBOARD_KEY_VOLUME_DOWN =3D 0x81
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>     enable_digital_io()
>=20
>     usb_keyboard_init()
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>     while( !usb_is_configured ) loop
>     end loop
>=20
>     var dword counter
>=20
>     forever loop
>          usb_keyboard_flush()
>          if( usb_is_configured() ) then
>              counter =3D counter + 1;
>              if( counter > 10000000 ) then
>                  counter =3D 0
>                  ush_keyboard_send_key(0x00, USB_KEYBOARD_KEY_VOLUME_UP)
>                  usb_keyboard_flush()
>                  ush_keyboard_send_key(0x00, USB_KEYBOARD_KEY_NONE)
>                  usb_keyboard_flush()
>                  ush_keyboard_send_key(0x00, USB_KEYBOARD_KEY_VOLUME_DOWN=
)
>                  usb_keyboard_flush()
>                  ush_keyboard_send_key(0x00, USB_KEYBOARD_KEY_NONE)
>                  usb_keyboard_flush()
>              end if
>          end if
>     end loop


--=20
Scanned by iCritical.

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