Good document on USB.

Started by JY Kim in comp.arch.embedded10 years ago 2 replies
USB

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...

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 USB. 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 summary of USB spec. USB 2.0 spec seems to be too big for me to read. I don't need to know about USB 2....


Something like FT245BM for USB 2.0 ? Parallel -> USB with real USB 2.0 bandwidth ?

Started by Martin Maurer in comp.arch.embedded13 years ago 12 replies
USB

Hello, 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...

Hello, 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 chip, which achieves more than 1 MByte / s ? I think with USB 2.0 there must be at least a factor of 10 to thi...


Multiple USB 1.1 devices in USB 2 Hub speed ?

Started by Anton Erasmus in comp.arch.embedded9 years ago 13 replies
USB

Hi, 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...

Hi, 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 something from Samtec, Bulgin and the mil circular D38999 series, but all these options are very bulky....


MCU + USB

Started by Mochuelo in comp.arch.embedded12 years ago 14 replies

Hi, I don't know if there is a better group to ask about USB. I want to create a device that will communicate with a PC via USB. I prefer...

Hi, I don't know if there is a better group to ask about USB. I want to create a device that will communicate with a PC via USB. I prefer USB to RS232 because I plan to power the device from the USB supply. I guess I have (at least) two options: 1) I use an MCU with integrated USB interface. 2) I use any MCU, plus an FTDI FT232R (USB-UART device), or equivalent. Option 2 makes pro...


1 USB to 2 via USB Hub chip?

Started by tommpro in comp.arch.embedded8 years ago

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...

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 linux)? Thanks! --------------------------------------- Posted through http://www...


Looking for USB hub with ULPI upstream port

Started by Allan Herriman in comp.arch.embedded5 years ago

Hi 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...

Hi 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 USB hub. I can find USB hub chips. I can find USB transceiver chips as well (to convert ULPI to U...


USB 1.1 host

Started by Martin Roth in comp.arch.embedded13 years ago 4 replies
USB

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...

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 PC. Thanks, Martin Roth Motorola Israel


Wireless USB Bridge

Started by Tom Lucas in comp.arch.embedded10 years ago

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...

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 it would need to be a USB to USB link. Although, thinking about it, it is possible that the Hum...


Embedded USB webcam IDENTIFIER hardware

Started by USB wcam in comp.arch.embedded8 years ago 1 reply

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...

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 work at USB 1.1. Due this is a embedded design, no computer interaction is required (this means that th...


USB non-buspowered GND - what to do

Started by Tobias Alte in comp.arch.embedded13 years ago 5 replies
USB

Hi, I'm currently working on a selfpowered USB device and have just a quick question. Maybe I overlooked/missed some info on the datasheets...

Hi, I'm currently working on a selfpowered USB device and have just a quick question. Maybe I overlooked/missed some info on the datasheets etc. but I am questioning myself what to do with the GND coming from the USB host. My device has its own supply so I don't need the USB supply. Should I connect the USB bus GND to the GND at the board for EMV purposes ( and leave USB +5V unconnect...


USB Host?

Started by Nick in comp.arch.embedded12 years ago 17 replies

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...

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 suitable. 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 predetermined. What might be the easiest way to achieve this? It's for a commercial application, t...


USB pin connections

Started by Anonymous in comp.arch.embedded10 years ago 2 replies

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...

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 "disables voltage regulator and pass-through Vcc for pull-up", but does not indicate whether or not to ph...


USB Stack

Started by guru in comp.arch.embedded12 years ago 3 replies

HI all, 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...

HI all, 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 controller card or we have to write our own. 3. What's the difference b/w USB host stack and USB device stac...


How to connect USB keyboard to embedded device?

Started by Mike Silva in comp.arch.embedded12 years ago 42 replies
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...

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" cannot function as hosts. I also gather that Hosts are much more difficult than hubs and functions. ...


How to safely test USB connector installation

Started by Norm Dresner in comp.arch.embedded13 years ago 12 replies

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...

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 these boards and I have destroyed the USB interface on one of them by plugging a device into the USB w...


USB-serial converter with a USB-device connector

Started by Urs Beeli in comp.arch.embedded12 years ago 6 replies

We are currently redesigning one of our machines that only has RS-232 interfaces and out marketing wants us to support USB as an interface....

We are currently redesigning one of our machines that only has RS-232 interfaces and out marketing wants us to support USB as an interface. The redesigned interface board will contain an USB device interface but will not be available soon enough for the suits :-) So as an iterim solution we are looking into ways to make our old product 'speak USB' at little cost. What we are thinking abou...


better way to implement USB interface?

Started by kathy in comp.arch.embedded11 years ago 8 replies

We are trying to implement an embedded system with USB interface. What is the easy and cost efficient way to implement it? - Which chip...

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 interface? I am pretty new to USB interface. I only use some 8051/z80 20 years ago.


USB device driver

Started by jeff in comp.arch.embedded14 years ago 1 reply

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...

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 find many tutorials on writing USB drivers for Linux or Windows, but nothing on how to do something on a more "...


USB device driver / LPC board

Started by ashu in comp.arch.embedded8 years ago 6 replies

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...

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 communication possible without writing a USB driver from scratch. Some ready made USB API or some software li...


USB frames synchronous?

Started by John Speth in comp.arch.embedded10 years ago 2 replies

Hi group- Does anyone know if the USB frame messages sent to all USB devices connected to the same computer are guaranteed to be synchronous...

Hi group- 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 where, when muliple sensors are connected to the same computer, they must all sample the sensin...