Re: where to get info to write basic usb driver for own device?
On Sun, Jul 04, 2004 at 09:49:01PM +, Aho K.F. Li wrote: What kind of device do you had build? A HID? If your device is not with heaven traffic, you can consider to develop your driver at user space with ugen(4) or uhid(4) at first. And then, move it into kernel space when you need. I had wrote a drive for a touch panel device. Actually, it is a input device for XFree86. I worked it with uhid(4), all my work was finished at user space. It would be a good entry point. I absolutely agree with this -- it's very hard to write good kernel USB drivers in FreeBSD, and if it can be done with ugen(4)/libusb, you'll safe yourself a lot of time and pain. -- Brian Fundakowski Feldman \'[ FreeBSD ]''\ [EMAIL PROTECTED] \ The Power to Serve! \ Opinions expressed are my own. \,,\ ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: where to get info to write basic usb driver for own device?
On Sun, Jul 04, 2004 at 12:53:39PM +, [EMAIL PROTECTED] wrote: So what I guess what I am asking is how hard would this be? (I have a reasonable knowledge of C and Java and have been using FreeBSD for a couple of years but have never written a device driver (for any OS)) Do I actually need to write a driver or can I use something already existing? Where would I get information on how to do this? So far I've been looking at the existing drivers; ugen, ufm etc., the programmers handbook and am starting to look at libusb...? Sorry for the long message. Any pointers etc. would be greatly appreciated. I am actually in a similar situation. I know some C, and want to write a device driver for a USB device (web cam), but I have no idea where to start. I've searched for a beginners guide to writing device drivers but failed miserably :-( -- Avleen Vig Systems Administrator Personal: www.silverwraith.com EFnet:irc.mindspring.com (Earthlink user access only) ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: where to get info to write basic usb driver for own device?
This may go without saying, but have you read Chapter 22 of the FreeBSD Developers' Handbook? I have not read intro(4) extensively but that is probably a good starting place, if you are completely in the dark. -Zera Holladay On Sun, 4 Jul 2004, Avleen Vig wrote: On Sun, Jul 04, 2004 at 12:53:39PM +, [EMAIL PROTECTED] wrote: So what I guess what I am asking is how hard would this be? (I have a reasonable knowledge of C and Java and have been using FreeBSD for a couple of years but have never written a device driver (for any OS)) Do I actually need to write a driver or can I use something already existing? Where would I get information on how to do this? So far I've been looking at the existing drivers; ugen, ufm etc., the programmers handbook and am starting to look at libusb...? Sorry for the long message. Any pointers etc. would be greatly appreciated. I am actually in a similar situation. I know some C, and want to write a device driver for a USB device (web cam), but I have no idea where to start. I've searched for a beginners guide to writing device drivers but failed miserably :-( -- Avleen Vig Systems Administrator Personal: www.silverwraith.com EFnet:irc.mindspring.com (Earthlink user access only) ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED] ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: where to get info to write basic usb driver for own device?
I would read up some code in /dev/usb and see how others did theirs. I would also read the Dynamic Kernel Linker by Andrew Reiter http://www.daemonnews.org/200010/blueprints.html, and the white paper by zep software http://www.zepsoftware.com/whitepapers/bsd_devtree.php. That's how I wrote my first USB driver. Rita - Original Message - From: Zera Holladay [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thursday, July 08, 2004 1:11 PM Subject: Re: where to get info to write basic usb driver for own device? This may go without saying, but have you read Chapter 22 of the FreeBSD Developers' Handbook? I have not read intro(4) extensively but that is probably a good starting place, if you are completely in the dark. -Zera Holladay On Sun, 4 Jul 2004, Avleen Vig wrote: On Sun, Jul 04, 2004 at 12:53:39PM +, [EMAIL PROTECTED] wrote: So what I guess what I am asking is how hard would this be? (I have a reasonable knowledge of C and Java and have been using FreeBSD for a couple of years but have never written a device driver (for any OS)) Do I actually need to write a driver or can I use something already existing? Where would I get information on how to do this? So far I've been looking at the existing drivers; ugen, ufm etc., the programmers handbook and am starting to look at libusb...? Sorry for the long message. Any pointers etc. would be greatly appreciated. I am actually in a similar situation. I know some C, and want to write a device driver for a USB device (web cam), but I have no idea where to start. I've searched for a beginners guide to writing device drivers but failed miserably :-( -- Avleen Vig Systems Administrator Personal: www.silverwraith.com EFnet:irc.mindspring.com (Earthlink user access only) ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED] ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED] ___ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: where to get info to write basic usb driver for own device?
On Sunday 04 Jul 2004 19:20, Avleen Vig wrote: I am actually in a similar situation. I know some C, and want to write a device driver for a USB device (web cam), but I have no idea where to start. I've searched for a beginners guide to writing device drivers but failed miserably :-( I briefly looked into this as well, and in summery, webcams are a bit of a pain. Unlike Linux folks, there's no Video4BSD (although there was some talk of one a while back), and so there's no standard way of doing it. The only proven video in API is the one used by meteora (I think) and bktr, and thats by all accounts hideous, which leaves you needing to write a lot more code than you first thought, and that was enough to put me off. A standard thing to do with the video stream having extracted it from the webcam which applications like gnomemeeting understand would make the job much easier. -- Mark 'If it compiles, ship it' pgp4htAe57hKA.pgp Description: signature
