/*
 * buck_emulator.c
 *
 *  Created on: 12 May 2025
 *      Author: Christian Lind Vie Madsen
 */


typedef struct {
    float Vin;      // Input voltage
    float Vout;     // Output voltage
    float IL;       // Inductor current
    float L;        // Inductance
    float C;        // Capacitance
    float Rload;    // Load resistance
    float dt;       // Time step (e.g., 25e-6)
} BuckConverter;

void simulate_step(BuckConverter *buck, float duty_cycle) {
    float dIL = (buck->Vin * duty_cycle - buck->Vout) / buck->L;
    buck->IL += dIL * buck->dt;

    float dVout = (buck->IL - buck->Vout / buck->Rload) / buck->C;
    buck->Vout += dVout * buck->dt;
}

/*
int main() {
    BuckConverter buck = {
        .Vin = 12.0,
        .Vout = 0.0,
        .IL = 0.0,
        .L = 100e-6,
        .C = 100e-6,
        .Rload = 10.0,
        .dt = 25e-6
    };

    float duty_cycle = 0.5;
    float Vref = 5.0;
    float error, previous_error = 0, integral = 0;
    float Kp = 0.2, Ki = 1000;

    for (int i = 0; i < 40000; ++i) {
        error = Vref - buck.Vout;
        integral += error * buck.dt;

        duty_cycle = Kp * error + Ki * integral;
        if (duty_cycle > 1.0) duty_cycle = 1.0;
        if (duty_cycle < 0.0) duty_cycle = 0.0;

        simulate_step(&buck, duty_cycle);

        // For debug:
        if (i % 1000 == 0)
            printf("Time: %.3f ms, Vout: %.2f V, IL: %.2f A, Duty: %.2f\n",
                   i * buck.dt * 1000, buck.Vout, buck.IL, duty_cycle);
    }

    return 0;
}
 */