libjpeg example – encode JPEG to memory buffer instead of file
How can I use libjpeg to encode directly to memory without using a file on my embedded system?
Author Archive for: kgodden
Entries by Kevin Godden
Get the Subversion (SVN) URL for a file using Tortoise SVN?
How can I get the Subversion (SVN) URL for a single file using Tortoise SVN?
Fire-And-Forget wrapper for sending simple UDP data using boost::asio libraries
So I had a problem, as part of an embedded software system I was working on I needed to periodically send some GPS information via UDP datagrams to other devices on the network – really simple stuff, transmit a string to an IP address on a given port, Fire And Forget, send a string from […]
Use PIC Timer2 not Timer0 for accurate Interval Timing on an Embedded system
Recently I was struggling to achieve very accurately synchronised camera and light triggers for a real-time computer vision project that I was working on, my original PIC embedded system for triggering everything using a PIC micro-controller had a fairly reliable accuracy of about 250us which was sufficient for a few years, but for various reasons […]
Using ‘Mod’ on (small) Embedded Systems while Avoiding Time Penalties
The Mod/Modulo (% in C) operator is incredibly useful in many situations, it calculates the remainder from an integer division, for example 10 Mod 3 = 1 (10 Div 3 = 3, 3 * 3 = 9, 10 – 9 = 1). Although you can happily call the % operator from your embedded C program […]
Python Monty Hall Problem Simulation
Python simulator of Monty Hall Probability Experiment
boost::split – warning C4996: ‘std::copy::_Unchecked_iterators::_Deprecate’: Call to ‘std::copy’ with parameters that may be unsafe
If you’re using the very handy boost::split() on Visual Studio, then you may run into the following annoying warning: warning C4996: ‘std::copy::_Unchecked_iterators::_Deprecate’: Call to ‘std::copy’ with parameters that may be unsafe – this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on […]
Remote Desktop Connection Closes / Disappears silently soon after Connecting
I had a strange problem with my Windows 10 Remote Desktop connections over the last few days, soon after connecting the connection would simply disappear without any message or warning, this would happen typically under a minute after connecting to the remote machine – amusing, but quite frustrating if you wanted to get anything done! […]
Connections from multiple Browsers to Mosquitto MQTT via Web Sockets not Working
If you are using the paho javascript MQTT client library to connect to MQTT via web sockets, you might notice that you can’t connect from multiple browser sessions at the same time. This may be because you are using the same client ID for each connection – you should use a different client ID for […]
A recipe for building a Web UI using MQTT for your IoT / Embedded App
Cook up a simple & tasty web UI for your embedded project with just a few simple ingredients! Served on a bed of wholesome Linux goodness on an SBC, (my favourites are: Raspbery Pi or Odroid N2 but substitute alternatives for your own taste) – this is sure to delight family and friends alike! Ingredients […]