#include <vector> #include <iostream> class Semantics { public: // Pass by value to store a new copy using std::move // (rvalue is moved, lvalue is copied) Semantics(std::vector<int> in) : m_v(std::move(in)) { } std::vector<int> get() const { return m_v; } // Pass by reference to modify an `out` parameter: lvalue only void append(std::vector<int> &out) { out.insert(out.end(),…
random things I made and things I learnt making them
Category: Programming
How to convert a byte vector into to a 32bit word vector
How do you convert a vector of 8bit values (bytes) to a vector of 32bit values (words)?
Why would you want to do such a thing? Well maybe you have a bytes stream that needs to be sent over a 32bit bus?
C++ Iterating Scoped Enumerations
Achieve the flexibility of Map but with the type safety of scoped enumerations.
Allow reverse lookup of the enumeration type from the mapped value by using class template iterators.
C++ Singleton Enumerated Map
Maps enum type literals to strings (or any type)
Singleton pattern ensure only single instance
Encapsulation checks if key exists to prevent lookup errors/exceptions.
C++ Encapsulated VectorOfVectors
Manage vector with the added safety of class encapsulation
C++ Serialize Function
Convert an unsigned integer to a vector of bytes (char) using function templates.
C++ Template argument deduction vs specialization
If you don’t know the type at compile time you can just use the template parameter type and the compiler will deduce the type from the function call itself. For example, see the commented out c’tor below. This is great for typing the size of std::array function parameter. However you could come unstuck if a…
Using struct module to send/receive floats over TCP socket with Python
Server This sends 10 floats at a time, on a loop. The transmit data type is determined by the’=%sf’ % payload.sizeformat string passed tostruct.pack. import socket from struct import * import numpy as np #number of floats we are sending payload_size = 10 payload = np.linspace(0, 10, payload_size) print(‘Sending {}’.format(payload)) #pack the floats as bytes…
Retaining axis limits using pan and zoom with Matplotlib
from matplotlib import pyplot as plt import numpy as np import matplotlib.animation as animation import sys class AniPlot(): # init the class def __init__(self): # get the figure object self.fig = plt.figure() # setup a single axes self.ax = plt.subplot(1, 1, 1) # register the callbac to kill the app when the window is closed…
SMBUS Touchscreen controller for 600W HP Server PSU with FreeRTOS
The purpose of this project is to use a touch screen to control the server PSU. In turn the touchscreen will display information from the PSU including its status, voltage, current and other data via SMBUS protocol. They are useful for charging LIPO batteries (with some modification) and running brushless motors or any circuit that draws large amounts of current.