Interfacing hardware with PC through USB connection
in [Embedded]
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From: Oscar Almer on 13 Jul 2010 11:15 On Tue, 13 Jul 2010 10:56:56 -0400 Neil <NeilKurzm(a)worldnet.att.net> wrote: > On 7/11/2010 3:24 PM, anex wrote: > > Hi > > > > I am working on a project that requires me to interface a particular > > hardware with my PC through a USB port and stream some audio data > > through this connection. However i have never worked on USB > > interfacing before and am looking for some good resources or > > tutorials to start work in this field. I might also need to use a > > microcontroller in the interfacing circuitry. I cant buy expensive > > ready made interfacing tools available in the market and would want > > build them on my own. It would be great if you guys could suggest > > something related to such a project that might be of help.. > > > > Thanks in advance.! > > > > --------------------------------------- > > Posted through http://www.EmbeddedRelated.com > > Jan Axelsons Book USB Complete is Popular. I went looking for books on this very topic last week, found the same, and bought it. I feel like I'm missing something, however; it seems to discuss the high-level protocols well enough, but so far I've found it somewhat repetitive and importantly lacking in low-level details. (Low-level details is what makes the high-level picture, after all). And of course, it's microsoft-centric to the point that (using drivers for) MacOS and linux isn't even discussed, which I feel is a bit odd. It's giving me an overview of how the protocol works, but I suspect ill have to dig into other sources (embedded processor documentation, linux kernel stuff) to get at the information I would actually need to implement a workable system. Not to say the book isn't useful, but it feels, to me, a bit limited. //Oscar
From: linnix on 13 Jul 2010 11:59 On Jul 13, 8:15 am, Oscar Almer <o.al...(a)gmail.com> wrote: > On Tue, 13 Jul 2010 10:56:56 -0400 > > > > Neil <NeilKu...(a)worldnet.att.net> wrote: > > On 7/11/2010 3:24 PM, anex wrote: > > > Hi > > > > I am working on a project that requires me to interface a particular > > > hardware with my PC through a USB port and stream some audio data > > > through this connection. However i have never worked on USB > > > interfacing before and am looking for some good resources or > > > tutorials to start work in this field. I might also need to use a > > > microcontroller in the interfacing circuitry. I cant buy expensive > > > ready made interfacing tools available in the market and would want > > > build them on my own. It would be great if you guys could suggest > > > something related to such a project that might be of help.. > > > > Thanks in advance.! > > > > --------------------------------------- > > > Posted throughhttp://www.EmbeddedRelated.com > > > Jan Axelsons Book USB Complete is Popular. > > I went looking for books on this very topic last week, found the same, > and bought it. I feel like I'm missing something, however; it seems to > discuss the high-level protocols well enough, but so far I've found > it somewhat repetitive and importantly lacking in low-level details. > (Low-level details is what makes the high-level picture, after all). How does your application interface look like? Do you have custom driver/apps on the target? If so, you can just overlay your protocols on top of the existing standards. I always start with the CDC driver because it provides a quick and easy debugging environment (just printf). Even if I need another driver class, I would end up with composite device with at least the CDC debug port.
From: Jon Kirwan on 13 Jul 2010 13:50 On Tue, 13 Jul 2010 10:56:56 -0400, Neil <NeilKurzm(a)worldnet.att.net> wrote: >On 7/11/2010 3:24 PM, anex wrote: >> Hi >> >> I am working on a project that requires me to interface a particular >> hardware with my PC through a USB port and stream some audio data through >> this connection. However i have never worked on USB interfacing before and >> am looking for some good resources or tutorials to start work in this >> field. I might also need to use a microcontroller in the interfacing >> circuitry. I cant buy expensive ready made interfacing tools available in >> the market and would want build them on my own. It would be great if you >> guys could suggest something related to such a project that might be of >> help.. >> >> Thanks in advance.! >> >> --------------------------------------- >> Posted through http://www.EmbeddedRelated.com > >Jan Axelsons Book USB Complete is Popular. I consider the book largely useless for the OP's purposes. It may help clear up some ignorance on some terms, but it is very far from "complete." I bought it, read it, and haven't ever looked at it since. Not even occasionally, as a reference. Wasted my time and money. Jon
From: Bob on 13 Jul 2010 17:15 On 13 July, 18:50, Jon Kirwan <j...(a)infinitefactors.org> wrote: > I consider the book largely useless for the OP's purposes. It > may help clear up some ignorance on some terms, but it is > very far from "complete." I bought it, read it, and haven't > ever looked at it since. Not even occasionally, as a > reference. Wasted my time and money. I would have to concur, "Introduction to USB" might be more accurate, and it is a good introduction. I think it is the most technical book on the market though. Fortunately, it's easy enough to find a cheap USB platform and some open source USB code and get stuck in. I haven't seen any public projects of people doing audio/video over USB, although this is asked about now and then. I would be interested if anyone knows of any.
From: Jon Kirwan on 13 Jul 2010 20:10
On Tue, 13 Jul 2010 14:15:36 -0700 (PDT), Bob <bobcousins42(a)googlemail.com> wrote: >On 13 July, 18:50, Jon Kirwan <j...(a)infinitefactors.org> wrote: > >> I consider the book largely useless for the OP's purposes. It >> may help clear up some ignorance on some terms, but it is >> very far from "complete." �I bought it, read it, and haven't >> ever looked at it since. �Not even occasionally, as a >> reference. �Wasted my time and money. > >I would have to concur, "Introduction to USB" might be more accurate, >and it is a good introduction. I think it is the most technical book >on the market though. Fortunately, it's easy enough to find a cheap >USB platform and some open source USB code and get stuck in. > >I haven't seen any public projects of people doing audio/video over >USB, although this is asked about now and then. I would be interested >if anyone knows of any. I think there is a HUGE need here for something like a MindShare book on the subject of USB. Something that delves into all aspects, hardware _and_ software, and from host to slave. The USB specs, thorough in their own way as they may be, aren't entirely helpful to a newcomer. I was able to learn from them but it wasn't until I saw actual code that _some_ things came a little clearer. I've been learning some as I go, from exactly the method you mention above, but I would very much like to see a thorough book on the topic from someone who has been there, done that, and done so comprehensively and can cover the various cases from personal experience and experimentation. Big hole needs filling here. Jon |