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.
Aug 18, 2020 Screen is somewhat persnickety for Serial Port work so try Minicom. Minicom is a nice little text com program. Install with apt install minicom and run for the first time with 'sudo minicom -s' to set your default. Note I've change the default port from /dev/modem to /dev/ttyS4 and the speed, in my case, to 9600. Now that we have created our serial port object and opened the port, we now want to read from the serial port. Here are the basic read functions: (there are several other, but these are the simplest and will work for most applications) int readChar - returns the next char from the input buffer int readByte – returns the next byte from the input buffer string readLine – returns.
We can use any one of them for serial communication but sometimes we require to create our own custom serial application for communication. In windows, it is easy to create the custom serial application using the win32 API.
In this blog post, we will learn serial port programming using the Win32 API. In Windows, serial port programming is very easy, MSDN provide all the required win32 API information which require for the serial port programming.
You can also see the below articles that how to change the properties of com-port like baud rate, parity using the Windows API.
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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 to 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 that 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.
In this blog post, we will learn serial port programming using the Win32 API. In Windows, serial port programming is very easy, MSDN provide all the required win32 API information which require for the serial port programming.
You can also see the below articles that how to change the properties of com-port like baud rate, parity using the Windows API.
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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 to 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 that 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 applications.
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
Serial Application for the console,
Grm tools installer for mac. 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.
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Reference: https://docs.microsoft.com/en-us/windows/desktop/api/fileapi/nf-fileapi-createfilea