USB in Comp.Arch.Embedded
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JY Kim - 2007-05-31 05:02:00
It seems that I have to implement USB client on board with ST STR710
micom. driver seems to be provided but I think I have to learn about
I do not know much about technical aspect of USB. and I have searched
usb.org and google but I couldn't find good document for USB,
something like summa...
If I have a number of USB 1.1 devices plugged into a USB 2 Hub, can I
get the full 12MB/s of each USB 1.1 device via the USB 2 link to a
host ? Or does the USB 2 link fall back to a 1.1 compatible mode ?
I am also looking for a Mini USB IP67 bulkhead connector. So far I
have found some...
is there a chip, in functionality like a FT245BM for USB 2.0 ?
I found on websites mentioning the FT245BM compatible for USB 2.0,
but i think they don't use USB 2.0, because transfer rate is "only" 1
MByte/s, which looks like high speed USB.
Is there a faster parallel USB c...
guru - 2006-03-16 06:19:00
I am having some doubts. I am new to USB devices.
1.Whether USB stack should be implemented for each type of storage
device or one single USB stack is enough for all the storage devices.
2. Whether Drivers for disk controllers are included within the
operating system or a controlle...
tommpro - 2010-02-18 14:42:00
I am looking at a Atmel micro that supports 1 HS USB Host/OTG interface. I
have a need for at least 2 HS interfaces. Are there any issues connecting
the 1 HS USB Host interface to a USB Controller chip? Is there any Glue
Logic or SW needed to support this beyond normal USB stacks (like in
Does anybody know if the USB standard allows connection between USB 1.1
host with USB 2.0 peripheral ?
I know that you can connect the USB 1.1 peripheral device to USB 2.0 host
I want to build embedded system with USB-based communication device to
transfer data and update the configuration.
I've googled and found that the USB CDC class is not "standarized" (why
do we need standards if there's so many of them??)..The USB CDC is
divided into :
Started by kunil
7 years ago
I'm currently working on a selfpowered USB device and have just a quick
Maybe I overlooked/missed some info on the datasheets etc. but I am
myself what to do with the GND coming from the USB host. My device has its
supply so I don't need the USB supply.
USB wcam - 2009-06-10 20:18:00
Hi, I need to develop a embedded hardware (with a FPGA, example Xilinx(R)
Spartan-3AN FPGA) capable of IDENTIFY what kind of USB web cam is
plugged-in (example webcam manufacturer, speed, data transfer rate, etc.),
the USB will work with USB 1.0 or USB 1.1 (not USB 2.0) so a USB 2.0 web
cam will wor...
kathy - 2006-09-18 17:12:00
We are trying to implement an embedded system with USB interface. What
is the easy and cost efficient way to implement it? - Which chip set?
Free USB stack? chip with USB implemented or stand alone USB chip
I am pretty new to USB interface. I only use some 8051/z80 20 years ago.
Nick - 2006-01-22 15:31:00
I need to write data to a USB device (a printer) from a MCU. I believe I
need a USB host controller to do this, so USB-enabled PICs etc. won't be
This is purely a one-on-one configuration, there will be no other USB
devices or hubs connected, and the make/model of printer will be
eugene - 2006-07-01 21:35:00
Can somebody give me resources on how to develop a serial to usb
device? I'm not allowed to use rs232 to usb ICs so I have to develop my
Already have the USB specification.
uzinei - 2006-08-09 03:47:00
I'm designing an audio data transfer circuit using USB 2.0 interface.
I use the Cypress USB tranceiver.
I want to know the worst case transmission speed of USB 2.0.
I already read USB 2.0 Specification, but I cannot found any
information about that.
In USB 2.0 spec., there are only information ...
hectorhg - 2008-04-22 11:02:00
I'm trying to programme a USB to behave like a mass storage device and a
network unit (rndis) as the same time (only one usb port), i mean, when i
plug it to a windows PC i would like to see two new devices plugged. The
only way i've found is to show the usb like a hub with virtual un...
I'm looking at ways to update our companies firmware out in the field (it
will mostly be fpga code in .bit format). A USB memory stick would work
nicely for this. Do any of you have any recommendations on a
microcontroller that has a USB host core? Or what about USB-OTG?
Started by Ron
8 years ago
ashu - 2009-09-16 09:41:00
I have a LPC2478 board (http://www.embeddedartists.com/products/kits/
lpc2478_kit.php) which comes with a USB OTG port.
I will run linux on this board and connect this to PC which runs
windowsXP via USB OTG port.
I wanted to know if there is any quick way of making this USB
Allan Herriman - 2012-09-04 10:35:00
I have a microcontroller that I'm considering using for a new design. It
has a USB controller with a ULPI interface that requires an external USB
transceiver to connect to the USB DP and DM signals.
The chip has one ULPI but my application needs two USB host ports, so I
need to use a U...
email@example.com - 2007-01-28 01:24:00
I am working on a project using the i.MX21 processor having the
The processor contains the USB controller on chip. The board also has
a JTAG interface for debugging.
My current problem is that, I need to write a small basic driver to
check if the USB sub-system...
I am wondering is LPC-H2214 from here
has USB host? It is not clear to me what "USB-RS232 virtual port" means.
I am looking for ARM7TDMI based microcontroller with USB port so I can
plug USB peripherals into it ...
Atilla Filiz - 2009-02-16 06:31:00
I want to play with USB and microcontrollers. Can you suggest some uC s
that are easy to use as USB slaves to my laptop or embedded toys(like the
GP2X or Freerunner). I want to make some simple toys that can act like
USB keyboards etc.
ubrida - 2009-07-24 16:23:00
I need to build a custom usb to usb bridge. At a high level it is like a
one port hub with custom logic in the middle. So I need 2 usb ports, one
host and one device, and a programable MCU. It needs to support Mass
Storage Devices at USB 2.0 Hi-Speed (480 mbps). I am hoping to use vendor
Rob Horton - 2006-10-06 10:18:00
Anyone ever considered using USB as a (simple) control network instead
of using something like CAN?
The USB master could be a small computer, maybe running Linux. The
devices to be controlled could be based on the PIC18F2450 USB
We have a need in a new product design to be able to connect a standard
USB keyboard. That's the only USB device we will ever want to plug in
(no, really!). I know next to nothing about USB, having just
downloaded the spec yesterday. I gather we want a USB Host, and that
most "USB micros...
Kouso Wieaka - 2005-08-25 09:31:00
I recently saw a Micro-USB module on Dontronics's web site
(http://www.dontronics.com/micro-usb.html). Appearently it convert RS232 to
USB and vice versa.
Would it possible (how) to use this Micro-USB module con connect and an
off-the shelf USB webcam to a micro controller such as A...
Started by Unknown 5 years ago
I'm new at working with USB and need some help with a design issue.
My uC with USB functionality (Cypress PSoC CY8C24994) needs to
operate on 3.3V but I am aware that the USB Vcc is traditionally 5V.
PSoC Designer allows me to start up the uC in 3V USB operation mode,
which effectively "...
sau_sol - 2009-09-27 09:13:00
I am currently using LPC2138 for my designs.
now I got a similar controller LPC2141 with the additional feature of USB
Now I want to know is there any way to implement a USB Host firmware by
using a USB device hardware.
If yes please let me know the method.
Jim Flanagan - 2009-08-19 21:49:00
I am just getting up to speed on using USB in an embedded
environment. What I am wanting to do is to use one of the
available microcontrollers (AVR,PIC,etc) in a USB HOST mode.
In particular, I desire to interface a USB mouse to
an embedded project. Is this feasible with the
RJR - 2007-03-26 05:21:00
I have a working design that has a USB (1.1) client interface and uses
the USB 5V supplied by the Host PC to re-charge internal Li-Ion
I am now considering upgrading the device to USB OTG. My processor is
capable of this - when equipped with an external Charge pump (e.g.
Does anyone know if the USB frame messages sent to all USB devices connected
to the same computer are guaranteed to be synchronous and in lock step?
Please excuse my limited knowledge of USB. The reason I'm asking is that
I'm looking into the implementation of a USB based sensor...
Any suggestions on uCs that have USB interfaces? Trying to avoid 8051
Atmel seem to make some AVRs with USB, anyone have experience with them?
Started by Hw
8 years ago
We are building a board based on the NIOS processor. In addition, we
are putting 2 USB ports to be able to use "off the shelf" USB devices.
We are using the TI TUSB2136 chip to control the USB ports. We are
running a simple control loop and ISRs instead of an actual RTOS.
I can fi...
Started by jeff
9 years ago
Tom Lucas - 2007-09-12 04:40:00
I've just bought a Humax Digital Video Recorder and it has a USB 2.0
interface to allow saved films to be copied onto a PC. However, it is
upstairs in my living room and my PC is in the basment and I don't want
to run a cable down there.
Humax's PC software will only work with a USB port so...
I want to do some vision recogition experiments using an ordinary USB webcam
(640x480pixels should be more than sufficient) on eCos. Obviously, there are
no drivers for eCos so I'll have to write my own. Does anyone know if there
are USB webcams out there for which the transmitted USB packets are...
sc - 2006-04-27 06:30:00
hi to all!!!!!!!!!
can you please suggest me some video processors that i want to include
in my design of USB frame grabber.let me be more clear.i am under
process of designing of one frame grabber board which will receive
input from USB cameras via USB 1.1 port and wil pass the frames to the
Bruno Richard - 2006-10-19 09:43:00
I am in search for a microcontroller with a USB interface. Lots of them
are available, but I would like to have a MASTER USB capability (my
device will act as a hub).
As I do not require USB 1.1 (only very small pieces of information to
be exchanged) I want to select a, 8-bit device. ...
Okay, I admit it, I've screwed it up before and I don't want to do it again.
I have several Single Board Computers that have SBC headers on them and I
have to run a commercial cable from the headers to a standard USB chassis
connector. The polarity of the USB header isn't obvious on some of thes...
Started by Unknown 6 years ago
I wonder if anyone can help, I am looking for a USB Microcontroller
with the following specifications
USB+USART+SPI , possibly not need SPI
USB slow or fast, RS232-300-19200 baud min, prefer upto 115200.
When the USB is in suspend or not connected Microcontroller needs to
run at low speed suc...
Venkateswaran - 2006-07-26 13:13:00
If anybody used Renesas SH7720-USB in your product/application, please
share your experience/comments!. I undestand that SH7720 had bug in
USB/silicon. Now they are claiming that, the problem is fixed.
We wanted to check the Sh7720 USB function, to ensure that its working
perfectly with S...
S45 - 2006-12-28 04:11:00
I am a board design engineer( < 6 months experience). I wish to design a
wireless USB docking station. At the moment I am into selection of
parts(wireless USB controllers). Is there any wireless USB hub
controller/ wireless audio controller/ wireless peripheral controller
I am designing a microcontroller based device which needs to connect to
PC, probably by USB, and also needs some removable storage.
My first thought was to use compact flash for the storage because I've
done that before & know how to use it. But then I wondered about using
the USB flash...