Reading Serial Port Data & Plotting Gray Image in Matlab

I my previous post I connected a OV7660 camera module to STM32F4 Discovery board. Then I was needed to display the data transmitted by micro controller to PC as an Gray scale image. To do that I use Matlab. Using Matlab reading a serial port is easy, but you must get familiar with matlab.

My micro controller sends data as bytes (0-255) to PC which indicating intensity values of each pixel in image. I pick those bytes by reading the relevant serial port in matlab. I suggest you to get familiar with matlab Serial functions before looking at the below code .

This code containes only few lines, but it does much work to read and display bytes as an image.

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clear all s = serial('COM1'); s.BaudRate = 921600; %get(s); image = zeros(70,80); row =1; col = 1; fopen(s); pix = fgetl(s); while str2double(pix)~= 256 pix = fgetl(s); end while str2double(pix)~= 300 pix = fgetl(s); end for i = 1:70*80 pix = fgetl(s); %class(str2double(pix)); image(row,col) =str2double(pix); %image(row,col) = 255; if mod(i,80) == 0 row=row+1; col = 0; end col=col+1; end fclose(s); %figure() colormap(gray); imagesc(image);

Following video presents how this code works. Each and every time pressing the Run icon, It will show the image captured by camera.

Comments are warmly welcome!