A Blog About Random Computer Subjects
Frank DeCaire I’ve talked about Inversion Of Control in previous posts, but I’m going to go over it again. If you’re new to IOC containers, breaking dependencies and unit testing, then this is the blog post you’ll want to read. So let’s get started… Basic Concept of Unit Testing Developing and maintaining software is one of the … Read moreDot Net Core Using the IOC Container
When I started using .Net Core and xUnit I found it difficult to find information on how to mock or fake the Entity Framework database code. So I’m going to show a minimized code sample using xUnit, Entity Framework, In Memory Database with .Net Core. I’m only going to setup two projects: DataSource and UnitTests. … Read moreDot Net Core In Memory Unit Testing Using xUnit
I’m currently working on an ALU in VHDL. To get warmed up, I tried my hand at some basic arithmetic, which I’m going to discuss in this blog post. Here’s the diagram of the ALU: A and B are the two inputs and F will be the result. Each input and output is a 4-bit … Read moreVHDL Arithmetic Functions
Today is March 14th, which means that it’s PI day! So I’m going to talk about computing the number PI. Years ago I wanted to use my computer to calculate the number PI and I assumed that it was just a matter of getting a formula for PI and just running through a loop that … Read moreComputing PI
My latest hobby is to learn VHDL and apply to the Mimas V2 FPGA board. As with any language, reading about the language is all well and good, but attempting a real application is where the rubber hits the road. I read through several tutorials and some introduction material to familiarize myself with some of … Read moreVHDL – Shift Register
This is a continuation of my FPGA series. I’m going to show how to create a one-bit full adder circuit using a schematic diagram in Xilinx HDL language. Then I’m going to send the compiled code to the Mimas V2 Spartan-6 board and test it. This project is for the entry-level FPGA programmer. If you … Read moreHDL – Full Adder Schematic
After finishing the beginner’s guide for the Mimas V2 Development Board, I decided to try my hand at a circuit that I previously built with the GAL16V8 chip. I already had the PDS file for the BCD to Hexadecimal LED display, so I decided to try that. First, I needed to figure out what I … Read moreFPGA – Hex LED Display
I recently purchased an FPGA development board. Specifically, the Mimas V2 Spartan 6 board. There’s a really good introduction to this board which you can access by clicking here. The board looks like this: You can connect a micro-USB to USB cable to this board and program it from your PC. Plus, the power from … Read moreThe FPGA
In previous blog posts, I showed how the GAL16V8 operated and how to program it (see here and here). In this blog post, I’m going to discuss the differences between the 16V8 and the 22V10. Here’s the specification sheet for the GAL22V10: Lattice GAL22V10 Specifications. On first inspection, both devices look identical, except for the … Read moreProgramming the GAL22V10
When I wrote my blog post about building an ALU from an EPROM, I intended to use an EPROM from my old bag of parts. Unfortunately, none of my old UV erasable PROMs worked with the programmer. I’m assuming they are old and not usable. So I purchased a pair of 28C64’s from Jameco Electronics. … Read moreBuilding an ALU From EPROM – The Circuit