Questions tagged [usb]
usb, short for Universal Serial Bus, is an industry standard developed by USB Implementers Forum Inc that defines the cables, connectors and communications protocols used in a bus for connection, communication and power supply between computers and electronic devices.
11 questions
8 votes
8 answers
3k views
When is a device driver needed and when is it OK to read/write directly to the port?
I'm having a difficult time understanding when device drivers are needed, and when its fine to just talk directly to a port controller via the OS-provided serial/parallel/USB/etc. driver. For ...
- 4,970
-2 votes
1 answer
310 views
Loading My Custom OS from USB flash drive
Suppose I want to create a portable OS, that needs a USB flash drive only to work. and i wrote my boatloader in the first sector to be loaded by the BIOS, from here on, what can I do to load my OS ...
- 17
4 votes
1 answer
3k views
SPI vs SCI on TI processor
I have a Texas Instruments development board: LAUNCHXL-F28027. I'm confused on the difference between SPI (Serial Peripheral Interface) and SCI (Serial Communications Interface). What are their ...
- 171
1 vote
1 answer
83 views
How exactly does USB integration work from the micro controller end?
I have no prior USB integration and about 8 months of learning embedded systems on Atmel devices. I am trying to use an Atmel SAM L series to connect over USB to a computer. The use case is for data ...
- 11
5 votes
1 answer
1k views
Driving Linux input events from serial device
I'd like to build a RaspberryPi-based device that can communicate with my Linux laptop over USB (don't think it matters, but I'll be using a custom made USB dongle that has an FTDI chip on it, and my ...
- 4,970
3 votes
3 answers
3k views
Read data from a device through usb port at high frequency
I need to know if I can get acceleration data from an IMU at 500Hz via USB. I've been going through the code that the manufacturer provides and trying to improve it. Right now I cannot go faster ...
- 1,232
-1 votes
1 answer
1k views
Determine file type and then decompile to edit source [closed]
I'm new to this type of programming, but proficient in web development... looking to expand my palette a little. I have this file. In Windows 7 the file properties window claims its a 'system file', ...
- 103
0 votes
3 answers
4k views
Best Way to Access Hardware per COM Serial Port over USB Adapter
We are starting a total new Branch at our firm. I am usually developing database interfaces or internal server/client applications/tools for our company, but I never had to do something with hardware. ...
- 144
6 votes
2 answers
22k views
How does a USB device whether know to draw 500mA, 1A or 2.1A from a computer USB port?
I'm having some issues with my Nexus 7 drawing just 500mA from a USB port able to supply 2.1A (test with my iPad). Details in this question. However, there is a comment posted "The Nexus obviously ...
- 1,394
1 vote
1 answer
612 views
Developing a cross-platform interface for writing to hardware like PicKit OR USB over the web?
I thought long and hard on weather to put this question in programmers or stack overflow. Please let me know if this is not the right place and I will post it to SO. My friend and I am developing a ...
0 votes
2 answers
4k views
How are interrupts implemented in practice? [closed]
Consider an USB device that is receiving data over a wireless network and an application running on the PC is reading this data. Now, on many languages (consider C# DataReceived), we have event ...
- 4,165