Post by thread:[PIC]:USB with 16C765?

PICers, Has anyone done anything with the PIC 16C765 low speed USB MCU ? I'm sort of thinking about/researching the idea of using it to grab frames from a (USB) PC cam - anyone done anything along those lines? Example code etc? I have datasheets TB054-8 in hand - the thing looks do-able. also had alook at the FTDI site (see below). Looks cool. Thanx if can advise - Deb Old PICLIST threads :- piclist 2002\04\05\074312a Thread: USB implementation on pic BY: Bob Barr emai Check out Cypress for a full range of USB parts. Thread: re: USB implementation on pic BY: spam_OUTasenaTakeThisOuTbigfoot.com i' ve been working with FTDI devices for a while. They have RS232<->USB and PARALLEL<->USB, along with some other things. Their chips are really great, you just have to put a driver on the PC side, and it works like a virtual COM port on the USB... Take a look at: http://www.ftdichip.com regards Antonio Sergio Sena CT2GPW .....asenaKILLspam@spam@bigfoot.com.NOSPAM BEng Electrical & Electronic Engineering Heriot-Watt University - Edinburgh Homepage: http://www.qsl.net/ct2gpw USB resources :- http://www.usb.org http://www.lvr.com http://www.beyondlogic.org/usb/ftdi.htm http://www.sold.com.au - SOLD.com.au - Find yourself a bargain! -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body

> Has anyone done anything with the PIC 16C765 low speed > USB MCU ? I'm sort of > thinking about/researching the idea of using it to > grab frames from a (USB) PC cam - anyone > done anything along those lines? Example code etc? Are you really sure the camera does low speed USB? Low speed USB is slow and has other restrictions such that I would be surprised to find is supported by a camera. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservKILLspam.....mitvma.mit.edu with SET PICList DIGEST in the body

On Fri, 14 Jun 2002 17:11:22 -0400, Olin Lathrop wrote: >> Has anyone done anything with the PIC 16C765 low speed >> USB MCU ? I'm sort of >> thinking about/researching the idea of using it to >> grab frames from a (USB) PC cam - anyone >> done anything along those lines? Example code etc? > >Are you really sure the camera does low speed USB? Low speed USB is slow >and has other restrictions such that I would be surprised to find is >supported by a camera. > I agree, I'd expect that the camera would almost have to be a full speed USB device. Low speed USB is a-w-f-u-l-l-y s-l-o-w (i.e. hundreds of bytes per second). This speed would be painful, especially for large chunks of data like pictures. Whether the camera can operate as a low speed USB device or not, though, the PIC would have to act as the USB host to talk to it. That aspect of it could get real ugly real fast. Regards, Bob -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email EraseMElistservspam_OUTTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

thanks guys. the more more we get into this thing the worse it looks. mt brother did a whole lot of research into using image sensor chips direct. the show stopper with most of them is the co-processor they use. When I saw Uchip's 765 listed as "USB trained", I thought "problem solved!". Shuks .. maybe some things just aren't meant to be :( Debbie http://www.sold.com.au - SOLD.com.au - Find yourself a bargain! -- http://www.piclist.com hint: To leave the PICList piclist-unsubscribe-requestspam_OUTmitvma.mit.edu

Most (if not all) WEB cams support low speed USB. My Canon S110 digital camera also works just fine on low speed USB. w.. Olin Lathrop wrote: {Quote hidden}> > > Has anyone done anything with the PIC 16C765 low speed > > USB MCU ? I'm sort of > > thinking about/researching the idea of using it to > > grab frames from a (USB) PC cam - anyone > > done anything along those lines? Example code etc? > > Are you really sure the camera does low speed USB? Low speed USB is slow > and has other restrictions such that I would be surprised to find is > supported by a camera. > > ***************************************************************** > Embed Inc, embedded system specialists in Littleton Massachusetts > (978) 742-9014, http://www.embedinc.com > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email @spam@listservKILLspammitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Walter Banks <KILLspamPICLISTKILLspammitvma.mit.edu> wrote: > Most (if not all) WEB cams support low speed USB. My Canon S110 > digital camera also works just fine on low speed USB. Walter: There are three USB speeds, with dumb names that are easily confused. "Low speed" is 1.5 megabits per second max, limited in most real applications to about 800 bytes per second. "Full speed" (which I expect is what you were thinking when you wrote "low speed") is 12 magabits per second, with a useful throughput of about 1 megabyte per second. "High speed" is 480 megabits per second, which works out to a max of about 53 megabytes per second in the real world. -Andy === Andrew Warren -- RemoveMEaiwTakeThisOuTcypress.com === Principal Design Engineer === Cypress Semiconductor Corporation === === Opinions expressed above do not === necessarily represent those of === Cypress Semiconductor Corporation -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Quoting Andrew Warren <spamBeGoneaiwspamBeGoneCYPRESS.COM>: > Walter Banks <TakeThisOuTPICLISTEraseMEspam_OUTmitvma.mit.edu> wrote: > > > Most (if not all) WEB cams support low speed USB. My Canon S110 > > digital camera also works just fine on low speed USB. > > Walter: > > There are three USB speeds, with dumb names that are easily confused. > > "Low speed" is 1.5 megabits per second max, limited in most real > applications to about 800 bytes per second. > > "Full speed" (which I expect is what you were thinking when you wrote > "low speed") is 12 magabits per second, with a useful throughput of > about 1 megabyte per second. > > "High speed" is 480 megabits per second, which works out to a max of > about 53 megabytes per second in the real world. Yeah, however this last one is only available on USB-2 devices. {Quote hidden}> -Andy > > === Andrew Warren -- RemoveMEaiwTakeThisOuTcypress.com > === Principal Design Engineer > === Cypress Semiconductor Corporation > === > === Opinions expressed above do not > === necessarily represent those of > === Cypress Semiconductor Corporation > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > -- -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.