#include <gpiod.h>
#include <stdio.h>
#include <unistd.h>
#define CONSUMER "ExampleConsumer"
#define GPIO_PIN 25 // GPIO Pin 25
int main(void)
{
struct gpiod_chip *chip;
struct gpiod_line *line;
int ret;
// Open the GPIO chip
chip = gpiod_chip_open_by_number(0); // Use the correct chip number for your platform, usually 0 or 1
if (!chip) {
perror("Open chip failed");
return 1;
}
// Get the line corresponding to the GPIO pin
line = gpiod_chip_get_line(chip, GPIO_PIN);
if (!line) {
perror("Get line failed");
gpiod_chip_close(chip);
return 1;
}
// Request the line as an output and set its initial value to 0 (LOW)
ret = gpiod_line_request_output(line, CONSUMER, 0);
if (ret < 0) {
perror("Request line as output failed");
gpiod_chip_close(chip);
return 1;
}
// Set the GPIO line to 1 (HIGH) to turn on the LED
ret = gpiod_line_set_value(line, 1);
if (ret < 0) {
perror("Set line value failed");
gpiod_chip_close(chip);
return 1;
}
// Wait for 5 seconds
sleep(5);
// Set the GPIO line to 0 (LOW) to turn off the LED
ret = gpiod_line_set_value(line, 0);
if (ret < 0) {
perror("Set line value failed");
gpiod_chip_close(chip);
return 1;
}
// Release resources
gpiod_chip_close(chip);
return 0;
}
I want to run this code but gcc isn’t installed or any type of package manager.
Questions:
- In order for me to interface with the GPIOs I should use the sysfs virutal file system?
- Is it possible to use the libgpiod to interface with the GPIOs?
- Do I have to build the Linux from the beginning with buildroot to have GCC and other important programs installed?
- How can I install a package manager and gcc?
Thanks