Serial Port Communication Matlab Code For Finite

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Reading with serial port in matlab. Learn more about serial, plot MATLAB. Toggle Main Navigation. I was unable to trsanfer this into matlab code 'bytesavailablefcn to a routine that will fread() the 200*6 bytes, decode the sequences, store the data into a cumulative buffer if required, and plot the new data'. Can you help me out with. Sep 08, 2016  This tutorial show the Communication between MATLAB and Serial Port based on RS232 Protocol. Tutorial Link: http://embeddedlaboratory.blogspot.in/2016/06/ser. Communication using the serial port interface. Convert instrument object to MATLAB code: query: Write text to instrument, and read data from instrument. The serial port object establishes a connection between MATLAB ® and the instrument via the serial port. Configuring Communication. Seriallist returns a list of all serial ports on a system. The list includes virtual serial ports provided by USB-to-serial devices and Bluetooth Serial Port Profile devices. This provides a list of the serial ports that you have access to on your computer and could use for serial port communication. MATLAB takes few seconds for processing the code and start the serial communication, wait until MATLAB shows ‘BUSY’ message at the bottom left corner of the software screen, as shown in below image.

I have a Verilog code simulated and synthesized on ISE design toolkit. I've got an FPGA spartan 6 device which is to be used for the implementation. But there is a problem with the device (probably a power issue) which makes the device unavailable in any of the COM ports when I connected it to my PC. So I want to check whether my Matlab code which I made for serial communication through the device does the desired job. So I need a method to test serial communication via any of the COM ports without connecting a serial com device to the PC. Is there any such method that I can Tx Rx serial data from Matlab to COM ports? Any software or any other method would be highly appreciated :)

Qiu

2 Answers

I found a way to test Matlab serial communication using virtual serial ports.

Download 'Freeware Virtual COM Ports Emulator' from: http://freevirtualserialports.com/
I installed it in Windows 10, and it's working (as trial).

Add a pair of two serial ports:

Execute the following Matlab code sample to verify it's working:

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The output is:

Bypassing the problem 'it only stays for a single test session'.
There is a problem when creating a pair of virtual ports using the software, it only stays for a single test session.
I guess it's a problem with the COM port emulation software.
The following solution, is not a good practice (and not a true solution).

• Declare the serial object as global, keeping the object persistent.
• Create the serial object only if it's not created.
• Don't delete and don't clear the serial object.

See the following code sample:

You can also look for a better virtual COM port software.

RotemRotem

As Rotem suggested, if you need to communicate via serial line between 2 program of your PC you need a virtual COM port emulator.

It seems you are running on Windows OS so I would recommend a completely free emulator (not a trial one). For Windows I use com0com Null-modem emulator (from SourceForge).

In the example below I will show how to communicate with 'another' device so Matlab will not handle both side of the communication. The other device will be simulated by a simple terminal. For windows I use RealTerm: Serial/TCP Terminal (also from SourceForge).

Setup:

Execute the setup of both program with all default options. by default com0com will create a virtual pair COM3/COM4 but if these port already exist on your system the program may assign other numbers. Check the numbers before you run the example. (it will also create a CNCA0/CNCB0 pair but you can ignore this one for now).

For RealTerm, once installed (don't forget to activate the server registration at the end of the setup, it should be ticked by default though), it will look like below. Keep all default options, just set the port number and the baud rate if they need to be changed.

Test MATLAB -> Terminal

You are ready to send Ascii characters or binary values from MATLAB to your device. The animation below shows you an example of both option:
_{you can click on the picture to see it full size. It is running in loop so you may want to wait until it restart from the beginning.}

Test Terminal -> MATLAB

Below animation shows you how to test the communication in the other way:

Don't forget to tick [CR][LF] on RealTerm when you send Ascii characters and want to use the '%s' format specifier on MATLAB, as it needs these characters to detect the end of the string.

Note:

• If you have another terminal program that you are more used too, itwill work the same.
• If the RealTerm option does not suit you, or if you want to handleboth sides of communication from Matlab, then you can use the codeprovided by Rotem in his first answer. Just install com0com butignore all the RealTerm part.

HokiHoki

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I am looking to take in data from a temperature sensor on an Arduino Uno board and have matlab store the data while also plotting the data on a graph in real time to monitor sensor changes. This will eventually be implemented with a different sensor and this more of a proof of concept. I have two issues currently troubling me:

1) I need to be gathering the data points 1000x a second (which my current code cannot do)

2) After several seconds of monitoring the data a great deal of noise enters the system

Here is my matlab code

Here is my arduino code

2 Answers

From what I have tried, the serial communication at 38400bd is enough to transmit an int at 1kHz. You can use 115200bds; your speed of 500000bds is not supported, even if it usually works.

The ADC will have no problem with 1000Hz. The Arduino command analogRead works at 10kHz; and if you would access register of atmel MCU directly, you could speed up analogRead to 100kHz.

Your code is slowed down with drawnow. You dont need to refresh at 1kHz; if you refresh at 10Hz, it will be real time for your eye.

Bisection Method Matlab Code

In arduino sketch you should put a delay(1) (1ms), so you know the serial buffer wont get full.

Matlab Code For Finite Element Method

also , to speedup the transfer speed, sending the data as binary will help a lot the Serial.println(tempreading); you used sends data as string. meaning it will send 6 characters each time. (5 characters + the CR). sending as binary will need only 2 bytes.; a 3X speed increment already.
To send data as binary in arduino , use

tryingToLearn

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