Category Archives: C++

C, C++, Operating Systems, Programming, Windows

Compiling a C Program from Visual C++ 2015 Command Prompt

For quick compiling of C/C++ programs on a Windows PC,  the Visual C++ 2015 Command Prompt is your go to program. Many programs have no need for development in an IDE.

Before you can compile a c/c++ program you will need to install the Microsoft Visual C++ Build Tools 2015.

Once installed you will have a new list of shortcuts in your Start Menu.

Visual C++ Build Tools Start Menu Shortcuts
Visual C++ Build Tools Start Menu Shortcuts

If you right click on any one of the Visual C++ 2015 Programs and choose Open File Location you will also see the extensive list of tools.

Visual C++ Build Tools Explorer Shortcuts
Visual C++ Build Tools Explorer Shortcuts

Depending on what system architecture you are running, open one of the programs. If in doubt select:
Visual C++ 2015 x86 Native Build Tools  Command Prompt
or
Visual C++ 2015 x64  x86 cross Build Tools  Command Prompt

The following window will appear:

Visual C++ 2015 Build Tools Command Prompt
Visual C++ 2015 Build Tools Command Prompt

To verify that the prompt is functioning property, type cl and the prompt will output the exact same information again.
Note: You can use the Visual C++ 2015 Build Tools Command Prompt the same way you would use the standard command prompt for directory navigation.

  1. To test a simple C program, first create a test directory to hold your test program. md c:\test to create a directory, and then enter cd c:\test to change to that directory. This is where your source files and executable will be stored.
  2. Type notepad test.c  When the  Notepad alert dialog  pops up, choose Yes to create the new test.c file in your current working directory.
  3. In Notepad, enter the following code and save as test.c:
#include <stdio.h>
int main()
{
printf("Hello World!\n");
getchar(); //used to prevent executable from closing when double clicked
return ;
}
  1. Now from the Visual C++ Build Tools Command Prompt type: cl test.c. If the program compiled successfully you will see: /out:test.exe and test.obj. In your test folder you will now have the test.c source file along with test.obj and test.exe
  2. To run your newly compiled program simply type test and your program will run in the command prompt. You can also double click the test.exe executable.

To compile a program with more than one source file simply type:

cl test.c test2.c test3.c

The compiler will output a single file called file test.c
To change the name of the output program, add an /out linker option:

cl test.c test2.c test3.c /link /out:mynewprogram.exe

test.c source file

C, C++, Electronics, Integrated Circuits, Microcontrollers

What Is An Arduino?

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The Arduino was introduced in 2005 by founders Massimo Banzi, David Cuartielles, Tom Igoe, Gianluca Martino, and David Mellis. The Arduino is not really the board itself or the microprocessor on the board. The Arduino is a hardware/software platform that was designed to provide an inexpensive and easy way for hobbyists, students and professionals to create devices that interact with their environment. The Arduino platform is completely open hardware and open source software.

Arduino boards can be purchased pre-assembled or as do-it-yourself kits. The hardware design information is available for those who would like to assemble an Arduino by hand. The current prices of Arduino boards run around $20-$30 on SparkFun and clones as low as $9 on Amazon

The Arduino platform is a single-board microcontroller designed around an 8-bit Atmel AVR microcontroller, or a 32-bit Atmel ARM. Official Arduinos have used the megaAVR series of chips, specifically the ATmega8, ATmega168, ATmega328, ATmega1280, and ATmega2560. Most boards include a 5 volt linear regulator and a 16 MHz crystal oscillator.

The Arduino platfrom feature a USB interface, 6 analog input pins, as well as 14 digital I/O pins (six of which can produce pulse-width modulated signals) which allows the user to attach various interchangeable add-on modules known as shields or basic breadboards. Many shields are individually addressable via an I²C serial bus, allowing many shields to be stacked and used in parallel. Shields or jumper wires to a breadboard are plugged into the top of the board, via female 0.10-inch (2.5 mm) headers. The Arduino has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers

The Arduino’s microcontroller is also pre-programmed with a boot loader that simplifies uploading of programs to the on-chip flash memory, compared with other devices that typically need an external programmer. Arduino boards are programmed via USB over an RS-232 serial connection implemented using USB-to-serial adapter chips such as the FTDI FT232

The Arduino Platform comes with a simple down-loadable, cross-platform, integrated development environment (IDE) written in JAVA and allows users to write programs for Arduino using C or C++. The code you write is C/C++ syntax but not a valid C/C++ program. An extra include header at the top and a very simple main() function at the bottom, to make it a valid C++ program. The IDE is derived from the IDE for the Processing programming language and the Wiring development platform and contains a C/C++ library called “Wiring”. Wiring was based on the original work done on Processing project in MIT. The Wiring IDE uses the GNU toolchain and AVR Libc to compile programs, and uses avrdude to upload programs to the board. You can program the arduino in standard C using avrstudio and upload with avrdude.

Programming in the Arduino IDE is as simple as creating 2 functions()
1. setup() – a function run once at start up that can be used to define initial environment settings
2. loop() – a function called repeatedly until the board is powered off

A simple program to blink the Arduino LED

/*
Blink
Turns on an LED on for one second, then off for one second, repeatedly.

This example code is in the public domain.
*/

// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led = 13;

// the setup routine runs once when you press reset:
void setup() {
// initialize the digital pin as an output.
pinMode(led, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop() {
digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(led, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second
}

We have hundreds of tutorials in mind for the Arduino Developemnt Platform. We will begin to produce them soon so keep checking back.

For more information right now, check out the offical Arduino page at https://arduino.cc be sure to check out the Arduino playground which has tons of information to get you started.