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Hi everybody,
I am attempting to extend the USBMOUSE example (provided with PBP under /usb18 folder), so the target device (18F2550 or 18F4550) would be recognized by WinXP/OsX as both an HID Mouse and Keyboard. I'm not clear on how to use the USB desc files and would appreciate any examples and advise. If anyone has an example for just a Keyboard, that would also be of great help.
Cheers
Amit Pitaru
Brooklyn, NY
To implement a usb keyboard it is just a matter of setting up the descriptors properly. The hid documentation has a good example of the keyboard descriptor. http://www.usb.org/developers/devclass_docs/HID1_11.pdf
Here is the mouse example descriptor that has been modified to work as a keyboard. To send a key stroke to the PC is as simple as (similar to mouse example included with PBP):
USBOut 1, buffer, 8, endgame
after initializing the device
where buffer is 8x8bytes
1st byte = modifier keys (i.e. ctrl, alt, shift)
2nd byte = reserved
3-8 = keys pressed ( 0x04 = a, 0x05 = b, ...)
I don't know how to combine both a keyboard and a mouse together in one device but I have heard of making a composite device being one possible way. But as of yet, I have not got anything working.
I understand this is a late reply but hopefully someone else might get something from it.
Hi,
I realize I am resurrecting an old thread here, but I'm trying to get an 18F4550 to act as a "virtual keyboard". I've used Merfy's KBDDESC.ASM (above) and i've managed to get the PC to detect it as a keyboard, and can send keystrokes, however when I do, it seems to send the keystroke over and over and over until I send another one.
If I do this for example (and keep in mind this line is only run once):
USBOut 1, buffer, 8, endgame
where buffer=[0,0,$14,0,0,0,0,0] ' ($14=q)
the pc types "qqqqqqqqqqqqqqqqqqqqqq....." and on forever.
any suggestions?
Not really sure if this has anything to do with your problem...Quote:
Originally Posted by Kamikaze47
http://www.beyondlogic.org/keyboard/keybrd.htm
Looks to me like you you're on the right track...just not all the way there yet.
You've told the PC that you've pressed the 'q' key, but you haven't told the PC that you've released it, therefore, it repeats.
The first paragraph of the link above has some good info in it on the whole keyboard theory...should give you all the answers you need.
I can't seem to get the USB to work with PIC18F4550 using the KBDDESC.ASMQuote:
Originally Posted by skimask
I keep getting USB error if i plug in the PIC.
Code:buffer Var Byte[8]
loopcnt Var Byte
state Var Byte
Define OSC 48
Pause 10
USBInit
buffer[0] = 0
buffer[1] = 0
buffer[2] = 0
buffer[3] = 0
buffer[4] = 0
buffer[5] = 0
buffer[6] = 0
buffer[7] = 0
movecursor:
buffer[0] = 0
buffer[1] = 0
buffer[2] = $14
buffer[3] = 0
endgame:
USBService ' Must service USB regularly
USBOut 1, buffer, 8, endgame ' Send buffer to endpoint 1
while(1)
wend
Goto movecursor ' Do it forever
Anyone knows what is wrong ?
what speed external clock are you using?
and what configs are you using?
Using 20Mhz crystal.
Config is:
__CONFIG _CONFIG1L, _PLLDIV_5_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_2_1L
__CONFIG _CONFIG1H, _FOSC_HSPLL_HS_1H & _FCMEN_OFF_1H & _IESO_OFF_1H
I have tried using diff cap recommended in this forum.
Try this
Code:DEFINE OSC 48
@ __CONFIG _CONFIG1L, _PLLDIV_5_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_2_1L
@ __CONFIG _CONFIG1H, _FOSC_HSPLL_HS_1H
@ __CONFIG _CONFIG2H, _WDT_OFF_2H & _WDTPS_512_2H
@ __CONFIG _CONFIG3H, _PBADEN_OFF_3H & _MCLRE_OFF_3H
@ __CONFIG _CONFIG4L, _LVP_OFF_4L & _ICPRT_OFF_4L &_XINST_OFF_4L
I use KBDDESC.txt
USBOut 1, buffer, 8, endgame
t = $0
where buffer=[t,0,$14,0,0,0,0,0] ' ($14=q) OK
t = $2
buffer=[t,0,$33,0,0,0,0,0]' ($33 = /) error
i need send "?" = #33 + shift = $2