How do I implement interrupts and timers using the C-caller function on Simulink.

#include "mbed.h"

// IR Reflective Sensor Pin
DigitalIn sensorPin(D2); // Connect the output pin of the LM393 module to digital pin D2

// Variables for RPM calculation
volatile unsigned long prevTime = 0; // Previous time stamp
volatile unsigned long currTime = 0; // Current time stamp
volatile unsigned int pulseCount = 0; // Count of pulses in one revolution
volatile unsigned int rpm = 0; // Revolutions per minute

void countPulse() {
    pulseCount++;
}

int main() {
    sensorPin.mode(PullUp); // Enable internal pull-up resistor on sensor pin
    sensorPin.rise(&countPulse); // Attach the rising edge interrupt handler

    while (1) {
        if (pulseCount > 0) {
            __disable_irq(); // Disable interrupts while calculating RPM
            currTime = us_ticker_read();
            rpm = (60000000 * pulseCount) / (currTime - prevTime);
            prevTime = currTime;
            pulseCount = 0;
            __enable_irq(); // Enable interrupts
        }
        wait_ms(100); // Adjust the delay as needed for your application
    }
}

Answer 1

[Karanjot]

Hi Kuhle,

I understand that you want to integrate your C code using C caller blocks in Simulink.

The C Caller block resolves source C code and extracts the functions to utilize in your Simulink models. C Caller block only supports models with no dynamic states and variables. To include dynamic states and variables in your model, you should. May refer to the below documentation:

Implement C/C++ S-Functions

To use the C Caller block, define your C source code and any supporting files, on the Modeling tab, click Model Settings > Simulation Target.

Then, bring a C Caller block to the Simulink canvas, using Library Browser > Simulink > User Defined Functions.

You may refer to an example Simulink model:

Call C Functions Using C Caller Block - MATLAB & Simulink - MathWorks India

To learn more about this, you can refer to the below documentation:

Integrate C Code Using C Caller Blocks - MATLAB & Simulink - MathWorks India

I hope this helps!

Regards,

Karanjot Singh