USB is Universal Serial Bus. If your question relates to a specific chip, please mention it in your question.

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0answers
15 views

Connecting an Xbox controller to multiple devices [migrated]

I have an Xbox 360 and a wired USB 2.0 controller. I would like to be able to play a game on the console with the controller whilst a Windows computer registers what my input on the controller is. I ...
0
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2answers
47 views

SPI to USB converter Question (for STM32F105)

I have a question regarding which SPI to USB connector to choose and what the main difference is between them. All i want to to is monitor the SPI activity going on which is possible through an SPI ...
0
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1answer
33 views

connecting 2 GNDs with relative voltage difference

I have USB ground and Lab Voltage Source ground, for which I need common reference. I thought I could just connect them together, but I found, that USB ground is relatively higher than Voltage Source ...
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0answers
25 views

STM32 USB VCP bug

I have been working on a project for the past two weeks now and debugging this one issue has taken up this entire week. Wondering if anyone can help, I will try to be as explicit and clear as ...
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0answers
52 views

Why is a USB hub contoller need? [on hold]

If I wanted to use a single USB port to connect 4 devices. Why would I need a USB hub controller, what purpose does it serve? Can you link any helpful resources?
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0answers
23 views

Altium: Via plane Connect Style

How do you set up different connects Style for Vias in Altium, i have tried the recommended method that is in Altium Tec. docs. ie. (ObjectKind = 'Via') And (ViaDiameter = '24') but this don't work, ...
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1answer
40 views

Usb input current requirements for a power bank

My project is to take solar power from a 6w/6v panel, run it through a buck circuit tuned to 5v and charge one of the LiPo power banks. I perceive a buck circuit would do better at efficiency than a ...
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votes
4answers
852 views

Can a faulty USB device fry other devices on the same hub?

Some Googling revealed that a faulty USB device may fry the entire motherboard+processor of a computer if it is not fitted with appropriate fuses (if it is known though, I wonder why they wouldn't!), ...
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2answers
127 views

What is the purpose of input protection on USB (or at all)?

I have seen quite a bit where reverse biased diodes are used to clamp input voltages when spikes occur. What is the typical reverse breakdown voltage for a diode used in this type of application? ...
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0answers
22 views

FTDI2232d + TM4C1294 configurations

I posted this question before, but I am still struggling with this. I captured a schematic and others in this time so it should be more clear to see what's going on. I was given a custom board ...
1
vote
1answer
25 views

COM port assignments changing for DLP USB232M

I am working with some legacy PCBs containing USB-to-TTL UART adapters. The adapters are powered via the USB bus with only the transmit, receive and ground pins interconnected to the rest of the PCB. ...
0
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1answer
33 views

Custom USB PC-PC Interface

I would like to build a software interface using the usb4java library, for sending triggers for synchronization with the following specifications: Latency below 1 ms Range: 8-bit [0, 255] + bit [0, ...
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0answers
29 views

Converting USB webcam to wireless

I have a PC workstation and a usb camera installed about 5m away. There is power available at the camera but the USB port is now broken. It is prohibitively expensive to replace as it is installed ...
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1answer
18 views

Data transfer to Android USB Digital Audio device

Android 5.0 (API level 21) and above supports a subset of USB audio class 1 (UAC1) features: https://source.android.com/devices/audio/usb.html related links: ...
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0answers
28 views

DIY dual/hybrid pendrive

I have couple of damaged old pen drives lying around. The damage is related just to their fragile USB ports and adding a new port makes them work as new. Now since I am severing some cheap micro USB ...
0
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1answer
43 views

Split USB Port Into 2 Separate Ports

I've a device (An old NES cart, actually) that I've fitted with a USB port and a flash drive. I'm using it in a NES to Raspberry Pi conversion. My idea was to have a port on the side for connecting to ...
0
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3answers
62 views

usb to rs232 to usb

I have a system where there is usb slave device that is in a rotating structure behind a slipring. I need to pass the signal through the slipring (we only have 4 "wires") and onto a computer. Due to ...
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0answers
17 views

Do the usb ports (type c) of the new macbook or chromebook have direct PCIe access? Or do we not know yet? [migrated]

The usb type c standard supports PCIe signals as an alt-mode. Do we know if the type c ports on the latest macbook and chromebook have PCIe access. If they don't or we don't know yet, then what is ...
0
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1answer
39 views

USB charger with power bank charged from solar panel and peltiers

I would like to charge some batteries (maybe 1 lipo?) from either a 12V solar panel (about 300mA) or 2 peltiers (also about 200-300mA) in series (about 4V, but it’s really unstable and voltage changes ...
0
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1answer
47 views

cheap usb hubs passing on mains voltages

So we've heard a lot of sensational stories about people dying from cheap mains->5V USB converters. What sort of corners do these manufacturers cut and do they even save much money than if they made a ...
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0answers
36 views

Intermediary to Cut Power to USB after Certain Time without Data Communication

I have a mouse that includes rather bright lights that, irritatingly, stay on even after the computer has been shut off and the mouse is therefore not in use. While I could probably reconfigure the ...
0
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0answers
22 views

How to rewire a 6-port usb charging hub

For a project in school I am building a product which displays and charges any device which can run from a usb port. The problem is that I have the holes for the usb ports cut out of custom positions ...
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0answers
26 views

ATMega32U2 USB Issues

I purchased a couple ATMega32U2 chips from Varical the other day since they were very well priced and there was free shipping. I also finally discovered the pinout to this QFP32 socket I have. So I ...
2
votes
1answer
65 views

STM32 Virtual COM port baud rate

I'm using the STM32 VCP firmware and I want to transmit data to my PC from STM32F4 discovery board. The configuration of the virtual COM port is fine, the properties are the following in device ...
2
votes
2answers
158 views

How does a USB C port provide the power to charge laptops?

I've heard about laptops such as the new Chromebooks that are charged via a wall charger that connects to a USB-C port. I'm quite happy that this will supposedly standardize laptop chargers but I'm a ...
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0answers
11 views

New commands for Eibotboard firmware

My project involves an Eibotboard with slightly modified firmware to act as a polarisation controller for optical fiber. Here is the current initialisation script that is sent via USB with ucon: ...
0
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1answer
82 views

STM32F4 VCP transmit/receive data

I'm using STM32 VCP firmware on STM32F4 discovery. I generated the code with CubeMX and I could successfully integrate it into my Eclipse project. After calling the initialisation functions, the ...
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0answers
26 views

swd debug / programming via usb connector

im looking to use a usb mini connector for both charging and programming / debugging a small circuit. The customer will use the port for charging a lithium battery via 5v. There will be no USB comms, ...
2
votes
1answer
46 views

Why is USB D+ tied to VDD (for PCM2707 at least)

I'm trying to implement an audio DAC using PCM2707 as a receiver and, looking over a couple schematics of previous implementations - at least one being verified as correct, I noticed D+ being ...
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0answers
12 views

USB-like connection by bluetooth

I would like to ask if it is possible to plug in a bluetooth adapter into the portable drive instead of USB cable to wirelessly explore the data? I just want to make a USB-like connection wirelessly. ...
0
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3answers
55 views

USB 3.0 RX and TX Lines

If i design a PCB(1) with a type B USB 3.0 connector on it and use a Type A to B cable to connect my board to a standard personal computer with type A USB 3.0 connector do i have to swap the RX and TX ...
0
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0answers
16 views

USB OTG - Is a suspend/wakeup state necessary?

I am currently designing a USB OTG device, and am wondering if it is necessary to include suspend/wakeup protocols. I have taken a look at the USB OTG physical layer supplement/checklists ...
2
votes
1answer
53 views

Okay for USB to send data without specific OUT command first?

I have been going back and forth between writing software for my device and the PC application trying to get the protocol right. I have a pic18f4550 talking over interrupt transfers. It needs to ...
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0answers
68 views

Can I (re-)use USB data lines after charger detection?

I'm looking to add the Texas Instruments BQ24253 battery charger to my hardware design and to connect it a micro-usb receptacle. Does BC1.2 Compatible D+, D– Detection mean I can no longer use ...
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2answers
73 views

USB Short Circuit Breakdown [closed]

First of all, apologies for posting this here, but I couldn't find any stack exchange hardware website. While plugging the headphones to my laptop it touched the USB port and I heard (through the ...
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0answers
59 views

Smallest chip to provide MIDI/USB [closed]

I used to build many MIDI devices in the 2000s: good old MidiBox kit (ucapps.de) and some other MIDI interfaces with a kit. But now things have changed, and I can imagine that we can find a MIDI/USB ...
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0answers
43 views

USB interfacing on MSP430

I'm currently doing a project on MSP430F5638. I want to implement USB on it. I got the code from TI website, but while running this code I am facing some problems. 1.values in ...
2
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2answers
68 views

Temperature measurement into USB [closed]

I am trying to get a couple of temperatures into my computer. In my little lab I have about 50 thermistors that look a bit like this NTC-Thermistor. I now would like to get the temperature of all of ...
2
votes
3answers
92 views

Quality of usb-cables [duplicate]

Some suppliers recommend to use the original micro-usb cables for usage with there device. One example is syncing via Samsung Kies. I also exerienced that some devices seem to be realy sensitive to ...
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2answers
63 views

Does a USB hub fall under the definition of 'backplane'?

I am just curious if a typical USB hub with a couple ports for devices falls under the definition of a backplane.
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1answer
61 views

High speed data from microcontrollers to pc using daisy chain

I have STM32F4 discovery boards. I have 30 such boards supporting maximum data of 128Mbps. The max data at any instance in complete system would be 300Mbps.I need to pick this data and send it to PC. ...
1
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0answers
26 views

PIC M-Stack “add . to include” confusion

I am experimenting with the open source USB stack called M-Stack for the first time. I decided to start by building the HID mouse sample application, but I had to create my own project configuration ...
0
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1answer
60 views

Power ATMEL ATMEGA328P directly from USB

im wondering if it is Ok to power an ATMEGA328P directly from an USB-Poweroutlet i.e. an Apple-USB-Charger. And I mean directy: VCC to Pin 7+20 GND to Pin 8+22 Peripherals should be powered from this ...
0
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0answers
31 views

USB 3.1 Alt-mode standards for PCI Express

Is there a central set of standards for USB 3.1 alt-modes? I have seen standards for DisplayPort and MHL but nothing else yet. Is PCI Express going to have a standard? I have seen suggestions that ...
1
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1answer
65 views

How to measure the quality of a USB charging cable?

I have a set of USB cables (data and charge) and I noticed that, for a given charger, the charge time differs by cable. What would be a good way to measure the charging fitness of a USB cable? ...
0
votes
2answers
91 views

Switching between power supplies - USB dominant

I'm trying to create a data logger. I want the data logger to be able to run in 2 modes. Bench mode (usb powered 5V) Field mode (externally powered 3.3 - 12V) Bench mode is active whenever power ...
1
vote
1answer
77 views

AVR USB to Serial Converter; Quick Question

I have a TI86 calculator that I've had for over 7 years now. Well I'm letting a lady friend on mine borrow it, and I was going to load it up with some apps for her. And the tradeoff is happening this ...
0
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1answer
29 views

How do I specify 3 interrupt transfers per microframe in high-speed USB?

I am sending interrupt transfers over USB 2.0 and trying to get the maximum bandwidth possible. According to various documents, they indicate that "the endpoint descriptor may specify up to 3 ...
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0answers
36 views

CSI/DSI over one meter cabel

Imaging you have a smartphone where the display and the camera is attached with a one meter long cable. What would be the best and most power efficient way to transfer camera (CSI/I2C) and display ...
2
votes
3answers
60 views

What's the best way to add USB support to a project

It just so happened that I need to add a usb communication for my next project that I am working on.What's the best/cheapest way to do this. Should I be using a microcontroller with USB support like ...