Page 4 of 14
Page 54
#define _GNU_SOURCE
#include <gpiod.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int res;
int main(int argc, char **argv) {
for (;;) {
res = gpiod_ctxless_set_value("0", 4, 1, 1, "output test", NULL, NULL);
res = gpiod_ctxless_set_value("0", 4, 0, 1, "output test", NULL, NULL);
}
}
Remember to change "0" to "4" if running on a Pi 5.
Page 55
#define _DEFAULT_SOURCE
#include <gpiod.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
int res;
int delayms(int ms)
{
struct timespec delay = {0, ms * 1000 * 1000};
return nanosleep(&delay, NULL);
}
int main(int argc, char **argv)
{
for (;;)
{
res = gpiod_ctxless_set_value("0", 4, 1, 1, "output test", (gpiod_ctxless_set_value_cb)delayms, (void *)100);
res = gpiod_ctxless_set_value("0", 4, 0, 1, "output test", (gpiod_ctxless_set_value_cb)delayms, (void *)100);
}
}
Remember to change "0" to "4" if running on a Pi 5.
Page 56
#define _DEFAULT_SOURCE
#include <gpiod.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
int res;
int delayms(int ms)
{
struct timespec delay = {0, ms * 1000 * 1000};
return nanosleep(&delay, NULL);
}
int main(int argc, char **argv)
{
int offsets[] = {4, 17};
int state1[] = {1, 0};
int state2[] = {0, 1};
for (;;)
{
gpiod_ctxless_set_value_multiple("0", offsets, state1, 2, 1, "output test", (gpiod_ctxless_set_value_cb)delayms, (void *)1);
gpiod_ctxless_set_value_multiple("0", offsets, state2, 2, 1, "output test", (gpiod_ctxless_set_value_cb)delayms, (void *)2);
}
}
Remember to change "0" to "4" if running on a Pi 5.
Page 58
#define _GNU_SOURCE
#include <gpiod.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
int res;
struct gpiod_chip *chip = gpiod_chip_open_by_number(0);
const char *name = gpiod_chip_name(chip);
int num = gpiod_chip_num_lines(chip);
printf("%s %d", name, num);
gpiod_chip_close(chip);
}
Remember to change chip number 0 to 4 if running on a Pi 5.
Page 60
#define _GNU_SOURCE
#include <gpiod.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
int res;
struct gpiod_chip *chip = gpiod_chip_open_by_number(0);
struct gpiod_line *line4 = gpiod_chip_get_line(chip, 4);
res = gpiod_line_request_output(line4, "test output", 0);
for (;;)
{
res = gpiod_line_set_value(line4, 1);
res = gpiod_line_set_value(line4, 0);
};
}
Remember to change chip number 0 to 4 if running on a Pi 5.
Page 64
#define _GNU_SOURCE
#include <gpiod.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
int res;
struct gpiod_chip *chip = gpiod_chip_open_by_number(0);
struct gpiod_line_bulk bulk;
gpiod_line_bulk_init(&bulk);
gpiod_line_bulk_add(&bulk, gpiod_chip_get_line(chip, 4));
gpiod_line_bulk_add(&bulk, gpiod_chip_get_line(chip, 17));
res = gpiod_line_request_bulk_output(&bulk, "test", 0);
for (;;)
{
gpiod_line_set_value_bulk(&bulk, (int[2]){0, 1});
gpiod_line_set_value_bulk(&bulk, (int[2]){1, 0});
};
}
Remember to change chip number 0 to 4 if running on a Pi 5.
Page 66
#define _GNU_SOURCE
#include <gpiod.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
void gpiod_line_release(struct gpiod_line *line);
int main(int argc, char **argv)
{
int res;
struct timespec delay = {0, 10 * 1000 * 1000};
struct timespec time1, time2;
struct gpiod_chip *chip = gpiod_chip_open_by_number(0);
struct gpiod_line *line4 = gpiod_chip_get_line(chip, 4);
res = gpiod_line_request_input(line4, "RMeasure");
nanosleep(&delay, NULL);
gpiod_line_release(line4);
res = gpiod_line_request_output(line4, "RMeasure", 0);
nanosleep(&delay, NULL);
gpiod_line_release(line4);
clock_gettime(CLOCK_REALTIME, &time1);
gpiod_line_request_input(line4, "RMeasure");
while (gpiod_line_get_value(line4) == 0)
{
};
clock_gettime(CLOCK_REALTIME, &time2);
printf("Time=%d", (time2.tv_nsec - time1.tv_nsec) / 1000);
}
