sorry to jump in here, but (without knowing any details about your hardware - you didn't give any) are you sure you need to send actual image data over the USB bus?
Most LCD displays (full displays, that is) that I've seen send the actual image (screen) data over the normal (i.e. dedicated extremely high bandwidth) "monitor" line, and only control data (like setting the horiz/vert, and calibration for touch-LCDs) goes over the USB line. Yours may be different, but any "regular" type monitor is going to require a massive amount of throughput (probably more than USB can deliver) at all times, just for screen refreshes. Unless the monitor does fb cacheing and the host only sends updates - but who does that? On Thu, 2 May 2002, Manoj Sharma wrote: >Brad, > >It is a HID device. >I need to run X based applications over this LCD display. >Since X server uses /dev/fb to write to the frame buffer, I thought of >writing a frame buffer driver that reads the buffer (allocated by the >driver) and passes its contents to the the LCD controller over USB. >I don't know if there is a better way to do it. > >Thanks, >Manoj. > >On Thu, 2 May 2002, Brad Hards wrote: > >> On Thu, 2 May 2002 21:45, Manoj Sharma wrote: >> > Hi, >> > >> > I wanted to write driver for an USB based LCD display. >> > Is there any USB based open source LCD display driver or frame buffer >> > driver available? >> What sort of device? Is it a HID device or a full video device? >> I've done a driver (in userspace) that used the EZUSB chip as a USB to I2C >> interface, with a Matrox Orbital display. It ran a hacked version of LCDproc >> - worked quite well, but it was a bit ugly. >> That is a long way from a HID display (which I know of being worked on, but >> probably can't pass on details). It is even further from a full video >> display. >> >> Perhaps you could explain more about your requirements and hardware? >> >> Brad >> > > > >_______________________________________________________________ > >Have big pipes? SourceForge.net is looking for download mirrors. We supply >the hardware. You get the recognition. Email Us: [EMAIL PROTECTED] >_______________________________________________ >[EMAIL PROTECTED] >To unsubscribe, use the last form field at: >https://lists.sourceforge.net/lists/listinfo/linux-usb-devel > -- Dan Streetman [EMAIL PROTECTED] -------------------------------------------------- 186,282 miles per second: It isn't just a good idea, it's the law! _______________________________________________________________ Have big pipes? SourceForge.net is looking for download mirrors. We supply the hardware. You get the recognition. Email Us: [EMAIL PROTECTED] _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
