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Questions tagged [usb-host]

A USB host port implements the upstream end of a USB connection

0
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1answer
66 views

Fpga communicate to pc through usb

I'm currently working on my thesis project on making a secure pendrive. For that I have to design an USB protocol implementation on an FPGA. But I don't know how to physically connect that USB core ...
0
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1answer
92 views

Small microcontroller with USB host peripheral [closed]

I'm trying to find microcontroller with low pin coutn that has USB host capabilities. I know this can be done with big PIC24 or PIC33 microcontrollers, but I wonder if there are others chips that ...
1
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1answer
42 views

USB hub and upstream/downstream speeds

I am designing a USB hub that has a 2.0 upstream connection (pc is only 2.0). To one of the downstream ports I am connecting a Ethernet to USB IC capable of USB3.0 speed and Gb ethernet. My question ...
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3answers
106 views

Unrecognized usb3.0 device using non-standard connector

I Have two PCBs,pin out define as follows ,the host pcb is A connector,and the device pcb is B connector. I use the 1.25pitch connectors&USB3.0 cable to connect two boards,but the host board ...
0
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1answer
54 views

Can an Arduino Pro Micro act as a USB hid and usb host device at the same time?

I know that the Pro Micro can act as a HID device. As far as I understand the Pro Micro can also act as a USB Host using a usb-host adapter (shield) - right? Now can the pro micro be both a device ...
4
votes
1answer
106 views

USB Camera to GPU Memory Directly

There may be several points in this question which may not make sense to a knowledgeable person, so I do thank you for your understanding in advance. For a computer vision project I wish to process ...
0
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2answers
97 views

USB hub circuit

I have a custom made USB hub with 4 USB ports. It gets 5V max 500mA. Below is the datasheet for the hub chip http://minipcsale.ru/images/Minix-Neo-X8-h/GL852G.pdf now my question is If i connect 4 ...
0
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1answer
57 views

HID “report descriptor” includes set/get features?

After reading about HID report descriptor, it seems that it only includes "input report". http://www.rennes.supelec.fr/ren/fi/elec/docs/usb/hid1_11.pdf But what about get/set features ? Why it is ...
2
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2answers
87 views

What are the limitations of the USB Composite device

I am looking at coding a USB device that is capable of encapsulating two USB devices. I would like to create a HID keyboard with a single extra USB port. A mass storage device would be connected to ...
0
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2answers
271 views

How to increase write speed with USB High speed host mode with STM32F4? [closed]

I want to write into a text file in a Flash drive using STM32F407 (XCore407I Core Board) and via USB HS mode. I have used fatfs library and also Tilen Majerle Libraries for USB HS HOST mode. I ...
0
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1answer
80 views

Is there any way a usb device can identify the usb host operating system? [closed]

Is there any way for the USB device to know if it is connected to a Windows or to a Mac without the installation of a third party software? Maybe there is a way to "ask" a question via USB and figure ...
0
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1answer
131 views

What USB-2 cabling hardware do I need to connect two Windows 10 computers together? [closed]

I want to run a .NET app in each of the two computers, so that they send and receive data through USB-2. What kind of cable adapter will do this? BACKGROUND: I need to build a GUI on Windows that ...
1
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1answer
220 views

USB 2.0 circuit

I am designing and using a USB 2.0 (High-Speed) specification circuit. The circuit is shown as below. Sometimes CPU cannot recognize the USB stick (USB 2.0 High speed). At first, I changed the ...
0
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0answers
1k views

after replacing micro usb port, tablet charges only 450mah [duplicate]

I changed micro usb port which was broken (it takes out from motherboard) on tablet. On motherboard are 5 contacts and one is damaged (4. - it is for data transfer, ID). I solder +5 VDC contact and ...
0
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0answers
218 views

stm32f4 USB Host HID to interface touchpad..?

In developing a USB Host HID application where using the controller STM32F4, and the USB stack library available on the ST website, we are trying to send data/command to an USB HID device. But in the ...
0
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0answers
41 views

USB A 2.0 +5V bus interfering with Vsys?

I want to have a USB connector on my PCB that will act only as host for joysticks. It will be a USB2.0 A connector. The voltage supplied for this is from +5V_Vsys. My question is what happens when a ...
0
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4answers
173 views

uln2003a: Switching ground of device works, however, optional USB function of device doesn't work correctly

I use the uln2003a to switch a device (with use of a MCU) that is capable doing several things, like fm-radio, bluetooth, playing MP3's etc. It also provides an USB ...
0
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2answers
570 views

How to use USB to communicate PC with a USB device? [closed]

As I stated above I need to learn to create a healthy communication pathway between a PC and a USB device. I need to achieve 120MBytes/s(at least) baud-rate and I don't even have any idea about what ...
-3
votes
1answer
50 views

Micro USB Type B Splitter? [closed]

Is there a way to connect multiple (around 3-10) devices with a single micro usb-b cable? Planning to do something similar to this: With the end result to hopefully have all devices synchronized so ...
0
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2answers
54 views

USB 2.0 Host PC enumeration requirement

I am looking into USB 2.0 Ports in Host PC and LapTop computers. I am designing a device that will need to draw as much current as possible. Does anyone know how common these ports require enumeration ...
0
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0answers
61 views

Power Supply drop when Load is connected

I am trying to build my own circuit that is a representation of an OTG Y-Cable, i.e. There is a bi-directional connection to the phone, as the phone will supply power as well as receive it to charge. ...
2
votes
1answer
656 views

Charging a mobile Tablet while communicating with a USB device at the same time [duplicate]

I have designed a product (small spectrometer) using FT234XD usb-to-uart bridge and it connects to any mobile phone via ...
-1
votes
2answers
249 views

Can I Set A Voltage Output On The D+/D- Lines Of USB Communication [duplicate]

I asked a similar question on a different website, DreamInCode, for assistance programming on an Android. I've also come on to this site for a different question but I can see that the folk that use ...
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2answers
356 views

Isochronous and interrupt transfers for USB, where to learn about it? [closed]

I have been working with the TM4C129 uC from texas instruments, using the bulk example code that the company provides I was able to desing an osciloscope using the analog to digital converters, it was ...
0
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1answer
105 views

Which end is host in a USB-C to USB-C charging/power cable?

I have two different kinds of DIY USB-C connectors...one kind that is rigged to be a "host" USB-C connector (pulled-up with a 56k resistor per spec), and the other is rigged to be a "device" USB-C ...
0
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1answer
349 views

Understanding USB processing and polling delay in USB host controller

I am doing measurements related USB delay with USB-UART converter chip(CP2102 Silicon laboratories chip). I am sending array of data, when 0xee is received the ...
0
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1answer
262 views

Wiring a USB-C (host) cable question

I have wired some custom USB-C cables from scratch in the past, where the USB-A connector is plugging in to a host PC. If I wired a USB cable where the USB-C connector was plugging into a host ...
1
vote
1answer
71 views

USB2.0 EH with USB type-C in accordance with USB specifications? Reasoning?

We would like to implement a slim USB host to store/retrieve small files to/from an USB-flash-drive (with Type-C Plug). We would like to implement an embedded (targeted) host according to the On-the-...
-2
votes
2answers
85 views

How can I increase USB3.0 PCIe card voltage output? [closed]

I have 4-port SS PCIe card, which outputs 5V 900mA on each USB port. I have a need to communicate with a distant USB device and the cable length and current demands are probably dropping the ...
1
vote
0answers
1k views

STM32F4 USB host HID problem

I'm trying to drive USB host as MSC and HID on STM32F4, I have one STM32F407 Discovery board and one custom design PCB based on STM32F407. I'm using Keil compiler and ST std periph library, and for ...
-3
votes
1answer
211 views

how to write eprom data into USB Device by using USB Host in an embedded system? [closed]

I want to write AT24C64D EEPROM data to USB Device i.e (pen drive) using USB Host i.e (STM32L100RCT6 MCU). eeprom is interfaced with STM32L100RCT6 via I2C and this STM32L100RCT6 has USB device ...
3
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2answers
8k views

Does USB Host always supply power on VBUS?

I know a fair bit about USB, but for some reasons I am not able to answer this question myself. Does the USB Host port (let's say USB 2.0) always supply 5V on the VBUS pin? If not, how does it ...
0
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1answer
293 views

USB 3.0 RX&TX Connection

Sorry for the inexperience. This will be quick. I have two Texas Instrument ICs, one is a device, the other is a hub. I'm looking at a USB 3.0 device that has the TX and RX lines. When connecting ...
0
votes
1answer
794 views

USB plug in detection for charging port

Is there a way to detect if there is a USB cable physically inserted into a USB receptacle, even if it is just a cable (with nothing attached to it). I am designing a USB charging port (short D+ and ...
0
votes
1answer
454 views

Android USB Accessory as a Device?

The Android AOA specification states that When the Android-powered device is in host mode, it acts as the USB host and powers the bus. and When the Android-powered device is in USB accessory ...
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2answers
414 views

My USB D+ and D- signals have what looks like a clock signal embedded onto it. The chip is a ISP1362

I am trying to load a firmware up-rev to a device with a USB stick. It doesn't see the stick. My USB D+ and D- signals have what looks like a clock signal embedded onto them. The chip is an ISP1362 ...
0
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1answer
375 views

How does usb c charge and power peripherals with only one vbus pin [closed]

I am curious, if i am reading the digram correctly, how usb - c can charge a laptop and then with the same port(different time) power a peripheral device(like hard drive.) looking at the pinout it has ...
0
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2answers
1k views

USB Interrupt endpoint polling rate

I have captured USB traffic between host and device operating at Full Speed. Then I am filtering on an Interrupt endpoint. bInterval value is 9 for this endpoint. In the capture I am seeing IN token ...
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1answer
1k views

Homemade Arduino USB Host Shield

I'm trying to build the Circuits@Home USB Host Shield (based on the MAX3421E chip) from scratch; since I need to be able to power the Arduino using OTG mode, a premade board will not work for my ...
0
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0answers
67 views

USB port identification

I have to come up with an architecture for a system where PC communicates to two identical(but independent) micro controllers(in-built usb controller) over 2 USB channels. I don't have experience in ...
0
votes
1answer
197 views

Is it possible to connect USB printer to Atmega8 [closed]

I have a usb thermal printer, that I want to control using Hex commands in its datasheet from cheap micro-controllers. But to do that I need to create USB host in my board and it requires more than ...
0
votes
1answer
375 views

USB Vbus discharge

What's the purpose of discharging VBUS on the host side? I see that there is always a discharge circuit on the host side of USB VBUS but I want to know why it is needed and is it ok if I don't add ...
0
votes
1answer
625 views

Use mobile to power external LED(bulb) via a Micro USB port?

I have heard people using OTG cable and a USB cable to charge one mobile from another mobile. I was wondering, Could I use the micro USB port directly to power external devices like LEDs. I cut up ...
0
votes
1answer
136 views

USB Type-C EMCA cable - where does the mux happen?

If I wanted to re-route SBU1 and SBU2 to a separate controller because I only intend to use the USB 2.0 capabilities of the wire - Do I have to worry about the EMCA chip interfering? Does the USB ...
1
vote
1answer
168 views

AT90USBKEY as USB host

Can AT90USBKEY be used as dev. board for USB host device? What I would like to try is to use this board to check if I can send SCPI commands to some third party device via USB. And can this usb ...
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2answers
202 views

Most cost-efficient way to implement USB full-speed host? [closed]

I need to a device which can act as a USB host to send various chunks of static binary data periodically to a full-peed USB serial peripheral of FT232 type (RS-232-ish UART). I was thinking maybe ...
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votes
4answers
342 views

can a female A USB port be used on an OTG host?

I'm designing a USB device that will act as a host all the time. Instead of using a mini-AB OTG receptacle i'd like to use a classic female A receptacle on the PCB. Is this allowed and can this ...
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votes
2answers
91 views

Can we control our computer's USB port? [closed]

what i want to do is : I want to connect a USB fan to my laptop and through programming want to turn on and turn off the fan. Is it possible to do so? Please post your valuable suggestions.
3
votes
1answer
101 views

FTDI Vinculum code read out protection

I designed a USB dual host based on a FTDI's VNC2-32L1B. I'd want to protect its firmware from being read/copied cause it contains pretty sensitive data (private keys, etc.), but the VNC2 has no read ...
3
votes
2answers
1k views

Waterproofing USB port

Recently Samsung came out with the new Galaxy and Edge phones which are advertised as IP68 rated.The mircro USB ports on these phones are completely exposed, yet are still IP68 rated. My question is, ...