Tag: raspberry pi
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Does calling sqrtf always result in a single asm instruction?
I was recently running some performance benchmarks across different platforms to understand the cost of some simple mathematic functions such as sqrtf and quickly noticed, under certain circumstances compilers such as MSVC, Clang and GCC by default will not generate a single x86-64 sqrtss instruction, there is a little more to it… I think discovering…
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Programming a Digital Potentiometer (MCP4131) With Raspberry Pi & WiringPi
Github Link: https://github.com/comeradealexi/MCP4131 Datasheet One of the most important parts of programming an MCP is studying the datasheet provided with it. For the MCP4131, you can download it here: https://www.microchip.com/en-us/product/MCP4131 It will provide everything you need to know about the chip. One of the most basic pieces of information we’ll need to start with is…
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Connecting to Raspberry Pi direct to PC via Ethernet
This article will show you how to connect directly to a Raspberry Pi by connecting an ethernet cable directly to your PC without needing to do any setup on the Raspberry Pi itself. This means you don’t need to plug a keyboard and monitor into your Pi to connect to it. Requirements: PC with ethernet…
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lighttpd – Changing default user (Raspberry Pi)
After following the great tutorial here (http://www.penguintutor.com/linux/light-webserver) for getting lighttpd setup and running on my Raspberry Pi, I wanted to change the default user the service ran as so I could run commands from php scripts requiring more permissions. The part I got stuck on was that on a reboot, the folder in /var/run/lighttpd would…
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Problems with VisualGDB and Raspberry Pi 2
I followed the tutorial for setting up VisualGDB for a Raspberry Pi from this link: VisualGDB and below are some issues that I ran into and how I fixed them. Hope it helps! Compile Error: “bits/c++config.h: No such file or directory”: With this error, all you need to do is add the following include path to…