A USB host port implements the upstream end of a USB connection
2
votes
1answer
39 views
USB Interrupt and Isochronous transfer bandwidth concept
I read in the USB spec and other USB materials on the web that interrupt transfer mechanisms (for devices like mice/keyboard) are guaranteed a 'bounded latency'.
Whereas the isochronous transfers ...
0
votes
0answers
43 views
USB OTG Host A-Device stops supplying power to B-Device if low on power?
I have been working with Galaxy S3+USB OTG cable and have been successful in using it to power accessories related to a important project I am working on (yay!). However, I observed that the host ...
1
vote
1answer
106 views
keyboard and mouse interface
How do I interface a microcontroller with PC USB so that I can imitate the keystrokes and movement of keyboard and mouse. I've heard of software fixes, but is there any IC which can mimic the ...
1
vote
0answers
59 views
Getting more than 0.5W from USB OTG
Has anyone actually measured the maximum amount of power that can be drawn from a smartphone's (say Samsung S4) USB OTG in host mode?
I've read people suggest 100mA but can't find if anyone has ...
-1
votes
1answer
50 views
USB Compliant Power/Charging Circuit [closed]
I am designing a device that can charge a USB device, such as a cell phone. I have a 5v DC output source from my device. I know I can just tie D+ and D- together, and connect the 5v to the power pins, ...
0
votes
2answers
289 views
Internal USB (FFC?) cable with 90 Ohm Differential impedance
I'm trying to run USB D+/D- signals and some unrelated 19V power between two PCBs, on the daughter PCB the USB D+/D- will terminate to a USB-A-F jack. I have no problem maintaining 90 ohm differential ...
1
vote
1answer
66 views
Powering a USB Host with MCP1253 Charge Pump
I'm a SW head trying to design a circuit that can switch 5V to a USB Port for embedded Host Operation and switch it off for USB Device operation. Microchip have a few schematics which show the use of ...
-6
votes
1answer
130 views
USB host power dc/dc converter chip [closed]
I'm looking for a (cheap, surface mount) single-chip dc/dc converter to power a USB connection. I'm thinking that with so many USB chargers available, there might be a chip available specifically ...
5
votes
1answer
340 views
Building a USB 3.0 host device
Two of my friends and I want to build a device that helps one to transfer data from one USB mass storage device to another using a a touch screen interface. We have worked on embedded projects before ...
0
votes
2answers
116 views
Do I need an OS in my device?
I am planning to build a device that will help transfer data from one USB storage device to another.I am planning to incorporate a touch screen interface to provide the user with more control over ...
8
votes
3answers
752 views
What is a product ID in USB and do I need to buy it for my project?
I am trying to develop a portable device that will allow me to transfer data from one USB storage device to another without a using PC/Laptop.
I was reading the developers guide by Jan Axelson where ...
-2
votes
1answer
306 views
USB hub with power delivery OR android accessory mode
I'm looking for a USB hub solution for small host computer (like a Raspberry Pi or Nexus tablet) that can simultaneously power/charge said host computer.
I've heard about the USB power delivery ...
0
votes
2answers
685 views
Arduino Clone is not talking to my Mac
When I plugin my Osepp Uno (off-brand of Arduino Uno), the LED flickers a bunch, then the RX and TX lights do the same. But when I
ls /dev/ | grep -i usb
I get ...
4
votes
2answers
304 views
“Wireless” USB cable, via RF / 3G
I'm looking into the feasibility of a project to develop a USB-over-RF device for physical penetration testing engagements. The idea is that our tester could connect a device to a USB port on a ...
0
votes
1answer
436 views
Arduino MEGA ADK: read data from usb(not serial)
I'm new on this field and I've spent my last 3 days searching for a way to read some data from a usb device(http://www.willow.co.uk/TelosB_Datasheet.pdf). It sends packets of 12 octest and all I want ...
0
votes
0answers
92 views
Replacement for ISP1760
We have been using ISP1760 in our designs with Altium Nanoboard. The design uses a shared menory between the SRAM, USB interface, Flash component. Now, the USB controller for the Nanoboard ISP1760 is ...
1
vote
1answer
6k views
What exactly are the difference between a USB host and device
Came across some doubts:
What exactly are the differences between a USB host and device? Is it just that who powers the bus?
When two devices connect how the device say "hey I will be the host and ...
3
votes
1answer
217 views
Circuit explanation, role of the trimpot and capacitor, as shown in a part of the circuit
Here is a part of the IOIO circuit
.
Wondering if someone could explain the role played by the trimpot (R2) there (why not a fixed resistor?) and the role of the capacitor (C5).
1
vote
3answers
664 views
Are pull-down resistors included in the mbed USB ports?
For the mbed LPC 1768, I am trying to establish a USB connection with an external device (pins 31, 32, and 39 for D+, D-, and Vbus, respectively). According to USB in a NutShell: Connectors, a 15kΩ ...
0
votes
1answer
140 views
USB hosting options
I'm looking at a USB hosting application for the PIC platform, and it just seems that none of the compilers have good stacks available for USB hosting (though I've used CCS for usb devices with no ...
1
vote
3answers
483 views
Drawing 100mA / common ground for a bus-powered USB hub
I am trying to provide an external 5V power supply to a (previously) bus-powered USB hub.
My first attempt at this was to just connect the USB host's data pins to the hub's data pins, and the ...
0
votes
1answer
275 views
Does Arduino ADK shield for android, serves like a regular USB host shield?
I'm from Argentina and the guy whom I bought the Arduino accesories from doesn't have any USB hosts. But he has this.
I'm not interested in connecting an Android phone to it but I certainly would in ...
11
votes
8answers
15k views
Can an Android tablet serve as USB Host and be charged simultaneously through a single port?
A number of Android tablets are powered through the Micro B USB port but also provide USB Host support through the same port (e.g. Motorola Xoom 2, Acer A510/700). I need to be able to use USB Host ...
2
votes
1answer
709 views
iPad Doc connector: is it possible to using the camera connection kit while charging the ipad
I'm building a touch screen kiosk using an iPad and a USB BarCode Scanner (through the camera connection kit).
the problem:
The pinout here shows the USB pin that the scanner would connect to. ...
0
votes
2answers
479 views
USB Device Sharing
I have a product (or concept of) based on a microcontroller acting as a USB host to control a given device. The device also needs to be controlled by another device (host). Assume that my device has ...
8
votes
2answers
8k views
Converting passive USB Hub to powered USB Hub, by adding regulated wall-wart as power supply?
From a quick price-check on ebay,
Passive (bus-powered) USB Hubs - ~ $2-$5
Powered (externally) USB Hubs - ~ $15-$20
My use-case is to expand the no. of USB ports on a ARM-based SBC, and to embed ...
5
votes
1answer
771 views
USB host-mode on uC, to support small pre-defined set of USB devices
Apparently, one of the main reasons why most 8-bit/16-bit uC's do not support USB host-mode operation is because of the rather expensive process called "enumeration". From my research, this step seems ...
0
votes
2answers
4k views
FT232R eeprom problem .. how to make PC recognize it
it's my first time to use FT232R ..
when i connected it to the USB for the first time .. my Windows recognized it well, and its drivers were successfully installed ..
and even after programming it ...
3
votes
2answers
388 views
Can USB host controllers be used for device identification?
Does any USB host device provides any unique IDs which are available from USB controller to device? At software side, I can get the vendor ID (along with other hardware identification data such as ...
5
votes
1answer
807 views
TI LM3S ARM Cortex M3 with USB 3G Modem [duplicate]
I've got a TI LM3S Cortex-M3 Development board with USB host. I've done quite a bit of TCP/IP programming through the Ethernet and using SPI/UART GSM modems, but I was wondering the feasibility of ...
2
votes
1answer
584 views
PIC 32 interface to Logitech force feedback USB joystick
I am doing a project which requires interfacing the Force feedback USB joystick to a microcontroller, I came across pic32 which has USB hosting capability, now my question is: do I need to develop the ...
6
votes
4answers
3k views
Is it possible to use a Microchip PIC32 as a USB host and device at the same time?
I'm designing a system and maybe (if I don't find better alternatives) I will need to use a PIC32 as a handler in between two USB devices and a host. My plan is to use the PIC32 to hide the devices, ...
6
votes
4answers
704 views
Microcontroller acting as USB host for an audio device
Are there any microcontrollers which are able to act as a USB host for audio devices?
Basically I'd like to create an interface which allows my to connect my USB headset to the analog ...
