Raspberry Pi Forums

Code: Select all

#include <wiringPi.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <time.h>

int main(void)
{
int pin =7;
if(wiringPiSetup()==-1)
{
 return 0;
}
pinMode(pin,OUTPUT);//on indique que le GPIO7 est en mode sortie
while(1)
{
 digitalWrite(pin,1);//la valeur est définie à HIGH (3.3v)
 delay(500); //on attend 500ms
 digitalWrite(pin,0);//la valeur est définie à LOW (0V)
 delay(500);
}
return 0;
}

Code: Select all

int main() 
{
//===============================
// initialise the GPIO
if (!bcm2835_init()) return 1;

// indique que la PIN "pinOut" est en sortie
bcm2835_gpio_fsel(pinOut, BCM2835_GPIO_FSEL_OUTP);

unsigned int myDelay = 1000; // délais en [ms]. On aurait pu le déclarer : #define myDelay 1000

while (1) 
{
  bcm2835_gpio_set(pinOut); // allume la LED
  bcm2835_delay(myDelay);   // bcm_delayMicroseconds(utin64_t micros);  fait un delay en microsecondes.
  bcm2835_gpio_clr(pinOut); // éteint la LED
  bcm2835_delay(myDelay);
  }
} // main  */

Code: Select all

#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

int main()
{
    // Export the desired pin by writing to /sys/class/gpio/export

    int fd = open("/sys/class/gpio/export", O_WRONLY);
    if (fd == -1) {
        perror("Unable to open /sys/class/gpio/export");
        close(fd);
        exit(1);
    }
    //printf("%d\n" ,fd);
    if (write(fd, "18", 3) != 3) {
        perror("Error writing to /sys/class/gpio/export");
        close(fd);
        exit(1);
    }

    close(fd);

    // Set the pin to be an output by writing "out" to /sys/class/gpio/gpio24/direction
    
    fd = open("/sys/class/gpio/gpio24/direction", O_WRONLY);
    //printf("%d\n" ,fd);
    
    if (fd == -1) {
        perror("Unable to open /sys/class/gpio/gpio24/direction");
        close(fd);
        exit(1);
    }

    if (write(fd, "out", 3) != 3) {
        perror("Error writing to /sys/class/gpio/gpio24/direction");
        close(fd);
        exit(1);
    }

    close(fd);

    fd = open("/sys/class/gpio/gpio24/value", O_WRONLY);
    if (fd == -1) {
        perror("Unable to open /sys/class/gpio/gpio24/value");
        close(fd);
        exit(1);
    }

    // Toggle LED 50 ms on, 50ms off, 100 times (10 seconds)

    for (int i = 0; i < 100; i++) 
    {
        if (write(fd, "1", 1) != 1) 
        {
            perror("Error writing to /sys/class/gpio/gpio24/value");
            close(fd);
            exit(1);
        }
        usleep(50000);

        if (write(fd, "0", 1) != 1) 
        {
            perror("Error writing to /sys/class/gpio/gpio24/value");
            close(fd);
            exit(1);
        }
        usleep(50000);
    }

    close(fd);

    // Unexport the pin by writing to /sys/class/gpio/unexport

    fd = open("/sys/class/gpio/unexport", O_WRONLY);
    if (fd == -1) {
        perror("Unable to open /sys/class/gpio/unexport");
        exit(1);
    }

    if (write(fd, "24", 2) != 2) {
        perror("Error writing to /sys/class/gpio/unexport");
        exit(1);
    }

    close(fd);

    // And exit
    return 0;
}