How to control the generation of fixed points within a fixed period of 1ms and gradually generate points (waveforms) according to the progress of the period (time)？

@Peter,

I did encounter a similar problem when working on one of my client projects. T address your query, I implemented a time-based interrupt-driven system that triggers the generation of waveform points at regular intervals. Hope, this will give you clue to help started with your project.Here is a simplified example to illustrate this concept:

#include stdio.h

#include unistd.h

#include signal.h

#include sys/time.h // Include sys/time.h for struct itimerval and timer functions

int waveform_points = 0;

void generateWaveformPoint() {

    // Generate waveform point based on progress

    printf("Generated waveform point: %d\n", waveform_points);

    waveform_points++;
}

void timerHandler(int signal) {

    generateWaveformPoint();
}

int main() {

    // Set up timer interrupt to trigger every 1ms

    struct itimerval timer;

    signal(SIGALRM, timerHandler);

    timer.it_value.tv_sec = 0;

    timer.it_value.tv_usec = 1000; // 1ms

    timer.it_interval = timer.it_value;

    setitimer(ITIMER_REAL, &timer, NULL);

    // Simulate other tasks within the 1ms cycle

    while (1) {

        // Perform other tasks

        usleep(500); // Simulate task taking 0.5ms
    }

    return 0;
}

Please see attached results.

So, The generateWaveformPoint() function generates a waveform point based on the progress of the time period, then the timerHandler() function is called when the timer interrupt occurs (every 1ms) and triggers the generation of a waveform point and the main() function sets up a timer interrupt to trigger every 1ms and simulates other tasks within the 1ms cycle. By using interrupts and handling waveform generation in a time-driven manner, you can ensure that new points are generated at regular intervals without missing or overwriting existing points.