Sometimes we require to communicate with an external device like a printer, microcontroller board or any serial device using the serial port of a windows machine. There is a lot of serial application available like Hercules, HyperTerminal, Docklight, .etc.
We can use any one of them for serial communication but sometimes we require to create own custom serial application for communication. In windows, it is easy to create the custom serial application using the win32 API.
Simple C class example using serial port, USB, wireless This post is part of the Practical C programming tutorial for Bioloid Here you can find a post serie about using serial port communications with C/C and C#, for Windows, Linux and microcontrollers. For programming purposes we usually want to communicate computers with others computers, microcontrollers or other devices like GPS, LED or LCD displays. Serial port programming in C/C, Windows and Linux. Using the serial port is a lot easier, but sometimes tricky. This chapter introduces serial communications, RS-232 and other standards that are used on most computers as well as how to access a serial port from a C program. What Are Serial Communications? Computers transfer information (data) one or more bits at a time. Serial refers to the transfer of data one bit at a time.
C program to Linux Serial port read write. Rate this: Please Sign up or sign in to vote. Hi all, I am new to C and linux I wrote a C serial port program in linux to read the.txt file from ttyusb and to save this to a another.txt file. Serial Port Programming in Linux. I'm receiving data from a serial port in C, using Serial Programming Guide for POSIX Operating Systems as a guide. The data I receive should be always 10 bytes in length but I want to be sure that. Free unreal tournament download full game.
You can also see the below articles that how to change the properties of com port like baud rate, parity using the windows API.
Finding COM port Number of a Device
In windows, the serial device will display in com port section of device manager with name as COM1, COM2, COM3, COM4. etc. Generally, COM1 and COM2 refer to the hardware serial ports present in the PC and another com port number is export when any serial device or USB to serial device attached with PC. It also possible that com id could be virtual ( for example static virtual com port).
In my laptop, I have attached an Arduino board (Atmega 2560) and its COM id would be shown in com port section (Control Panel > Device Manager > Ports).
Compilers and IDE’s used
Here I have used Visual Studio 2013. You can also use MinGW (Minimalist GNU for Windows) an Open Source programming tool. Here I am assuming that you know how to create the console application using the visual studio and familiar with win32 API.
Opening a Serial Port
In Windows using the CreateFile(), we can open the serial port. The CreateFile() is a Win32 API which creates or opens a file or I/O device.
On success CreateFile() returns a handle that can be used to access the file or device depending on the flags and attributes specified.
Closing a Serial Port
You should remember that after opening the com port using the CreateFile(), you have to close it by calling the CloseHandle() otherwise it will be unavailable to other application.
On success CloseHandle() returns zero.
Serial port communication Application
Let see an example code where I am talking with a Mega2560 Arduino device. I have written a small code for mega2560 in which it receives serial data. If received data is “aticleworld” then it will send a message “Welcome to AticleWorld !” or otherwise it will send the message “Please Send Correct Message”.
Mega2560 serial code,
You can purchase Mega2560 from Amazon, Click here
Windows console Application,
In the below console application, I am using the win32 API to open the com port and sending the data to the open COM port. See the below video where I have downloaded the Arduino code in the Arduino board and communicating with this board using the console application.
Reference: https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-createfilea
Connections and operating system symbolic names
A serial port is a communication physical interface through which information transfers in or out one bit at a time (in contrast to a parallel port) being, more or less compliant, with the RS-232 standard.
But serial port communications aren’t only useful for wired DE-9 connectors. it also allows us to use it with USB (ftdi), Bluetooth (serial profile) and Zigbee using virtual serial ports.
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C Windows Serial Port Programming
Serial and virtual serial ports appear as COMx in Windows operating systems (COM1, COM2, …) andin UNIX/Linux as ttySx or ttyUSBx or even ttyACMx (ttyS0, ttyS1, ttyUSB0, ttyUSB1, ttyACM0, ttyACM1,…).
For programming purposes we usually want to communicate computers with others computers, microcontrollers or other devices like GPS, LED or LCD displays.
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Serial port programming in C/C++, Windows and Linux
Using the serial port is a lot easier, but sometimes tricky. The basic commands are to open a connection, read and write over this connection and, finally, tom close it, better if using the C++ RAII idiom.
Windows commands:
Here you can find a complete C++ for Windows example.
With these next two definitions (among others needed):
serialPortHandle wchar_t * device
…
Unix/Linux commands:
Here you can find a complete C++ for Linux example.
With these two definitions:
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char *device;
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…
More information:
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https://en.wikipedia.org/wiki/Serial_communication
http://en.wikipedia.org/wiki/Serial_port
http://www.lvr.com/serport.htm
http://digilander.libero.it/robang/rubrica/serial.htm http://en.wikibooks.org/wiki/Serial_Programming Comments are closed.
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