Clock Pulses Counter

Based in my last post, I decided to modified a little bit the code and create a 'Clock Pulses Counter'.

It is very easy following the steps explained in 'Increment/Decrement Variable (counter)' and adding some additional features.

Since the example is based in my last post, the main block will be the 'Matlab Function' block.

The schematic in this example can be seen in the next figure:

Clock pulses counter Schematic

As it can be seen, the schematic is almost identical, but a global variable called flag has been added.

The code I used in this example is the following:

 function y = fcn(u)

%clock flag counter

global A;

global flag;

if u

    if flag

        A = A+1;

        flag = false;

    end

else

flag = true;

end

y = A;

Global variable A is an int counter and global variable flag a boolean, which can be true or false.

Global variable A properties

Global variable flag properties

After initialized the global variable flag in the fuction Matlab block like it was explained in the last post, the example is ready to be run.

The output in this case would be a little bit different:

Output when clock period is 0.1 seconds

Output when clock period is 0.05 seconds

Notice that the counter would be faster or lower depending on the frequency of the clock.

Note: In order to see the ouput signal like the image above the simulation must be run step by step.