Advanced users • Re: Experimental RPi 6.12 kernel builds

Code:

#include <pigpiod_if2.h>#include <thread> using namespace std; #define PIN 30 int main(){   auto instance = pigpio_start(NULL, NULL);    // 2000Hz   set_PWM_frequency(instance, PIN, 2000);    // 128/255 = 50% duty   set_PWM_dutycycle(instance, PIN, 128);    // play for 10 seconds   this_thread::sleep_for(chrono::milliseconds(10000));   set_PWM_dutycycle(instance, PIN, 0);    pigpio_stop(instance);    return 0;}

Code:

#include <gpiod.h>#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <signal.h>#include <errno.h>// GPIO chip and line settings#define GPIO_CHIP "gpiochip0"#define GPIO_LINE 30// Global variables for cleanupstruct gpiod_chip *chip = NULL;struct gpiod_line *line = NULL;void cleanup(int signum) {    if (line) {        gpiod_line_set_value(line, 0); // Set GPIO low        gpiod_line_release(line);    }    if (chip) {        gpiod_chip_close(chip);    }    printf("\nCleaned up and exiting.\n");    exit(0);}void spin_wait(int us) {    struct timespec start, current;    clock_gettime(CLOCK_MONOTONIC, &start);    long target_ns = us * 1000; // in nanoseconds    do {        clock_gettime(CLOCK_MONOTONIC, &current);    } while ((current.tv_sec - start.tv_sec) * 1000000000L + (current.tv_nsec - start.tv_nsec) < target_ns);}int main() {    // Set up signal handler for Ctrl+C    signal(SIGINT, cleanup);    // Open GPIO chip    chip = gpiod_chip_open_by_name(GPIO_CHIP);    if (!chip) {        perror("Failed to open GPIO chip");        return 1;    }    // Get GPIO line    line = gpiod_chip_get_line(chip, GPIO_LINE);    if (!line) {        perror("Failed to get GPIO line");        gpiod_chip_close(chip);        return 1;    }    // Request line as output    int ret = gpiod_line_request_output(line, "toggle_gpio", 0);    if (ret < 0) {        perror("Failed to request GPIO as output");        gpiod_line_release(line);        gpiod_chip_close(chip);        return 1;    }    // Toggle GPIO at 2kHz (500us period, 250us per state)    while (1) {        gpiod_line_set_value(line, 1); // Set high        usleep(150);                   // Wait 250us        spin_wait(100);        gpiod_line_set_value(line, 0); // Set low        usleep(150);                   // Wait 250us        spin_wait(100);    }    // Unreachable due to infinite loop, cleanup handled by signal    return 0;}