working with Real-time windows target by M-file

I'm just getting to know and develop a simple control with MATLAB's real-time windows target.

Basically, the tool supports real-time application developed with Simulink block diagram with just a interface card.

My control application is fairly simple. The pseudo-code can be described shortly as:

while (1)
{
if (flg)
{
valve.open();
}

if (pressure > thres_pressure_B) && (flg)
{
valve.off();
wait(5s);
valve.reverse();
flg=0;
}

if (pressure < thres_pressure_A) && (!flg)
{
prog.exit();
}
}

with pressure: real-time sensor feedback reading valve: value transmitted to I/O card

where the aim of the control is to vary the pressure (in a container) up from thres_pressure_A to thres_pressure_B and down back to A (similar to a trapezoidal trajectory)

However, I feel difficulty implementing this algorithm in Simulink which is required by the toolbox (real-time windows target)

Is there any way-around this e.g. I can program it with M-file (preferred)? or any Simulink toolbox that can perform the same logic

Thank you and Merry Christmas!

Answer 1

[Jan Houska]

You need a Simulink model to work with Real-Time Windows Target. However, there are several possibilities how to implement your algorithm in a Simulink model.

The closest way to a M-file would be the MATLAB Function block. Although you can try to implement the whole algorithm as MATLAB Function block, I would not recommend doing so. Instead, it looks like your model needs to do a control action every 5 seconds. That would indicate a 5s sample rate. Then, in each sample, you perform one pass of your while loop. You can model the "if" condition e.g. by a conditional "If" subsystem. You can model the exit() by the Stop Simulation block.

[study]

the answer resolves to a MUST in Simulink model in order to work with Real-time Windows Target. That is also what I did in the last few days. Thank you