Raspberry Pi Zero W en C

GPIO avec wiring Pi

Raspberry Pi ZeroW: 192.168.1.35, port 22, root

ssh root@192.168.1.35

pwd: root

Installation de WiringPi:

Si git pas installé:

sudo apt-get install git-core

Pour vérifie si gpio installé

gpio -v

Pour supprimer wiringpi:

sudo apt-get purge wiringpi

hash -r

Télécharger wiringPi:

sudo apt-get purge wiringpi

Installer WiringPi quand téléchargé

cd WiringPi

git pull origin

./buil

Et vérifier installation:

gpio -v

Voir les gpio:

gpio readall

Test en sortie

gpio -g mode 26 output

gpio -g write 26 1

gpio -g write 26 0

Test en entrée:

gpio -g mode 26 up

gpio -g read 26

En C:

#include <wiringPi.h>

digitalWrite(26, HIGH);

Compilation programme utilisation wiringPi:

gcc -o prog prog.c -l wiringPi

GPIO sans wiringPi

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#define GPIO_ROOT "/sys/class/gpio"

#define EXPORT "/sys/class/gpio/export"

#define UNEXPORT "/sys/class/gpio/export"

#define LOW 0

#define HIGH 1

int export_pin(int num) {

   FILE* export = fopen(EXPORT, "w");

   if (export == NULL) {

       printf("Failed to open the export file\n");

       exit(-1);

   }

   fprintf(export, "%d", num);

   fclose(export);

   return 0;

}

int unexport_pin(int num) {

   FILE* unexport = fopen(UNEXPORT, "w");

   if (unexport == NULL) {

       printf("Failed to open the unexport file\n");

       exit(-1);

   }

   fprintf(unexport, "%d", num);

   fclose(unexport);

   return 0;

}

int set_direction(char *mode, int num) {

   char direction_file_path[1024];

   snprintf(direction_file_path, sizeof(direction_file_path), "/sys/class/gpio/gpio%d/direction", num);

   FILE* direction = fopen(direction_file_path, "w");

   if (direction == NULL) {

       printf("Failed to open the direction file\n");

       exit(-1);

   }

   fputs(mode, direction);

   fclose(direction);

   return 0;

}

int set_value(int val, int num) {

   char value_file_path[1024];

   snprintf(value_file_path, sizeof(value_file_path), "/sys/class/gpio/gpio%d/value", num);

   FILE* value = fopen(value_file_path, "w");

   if (value == NULL) {

       printf("Failed to open the value file\n");

       exit(-1);

   }

   fprintf(value, "%d", val);

   fclose(value);

   return 0;

}

int main() {

   int rslt;

   int num;

   int num_blinks;

   num = 26;

   num_blinks = 5;

   printf("\nFred will blink !!\n");

   rslt = export_pin(num);

   rslt = set_direction("out", num);

   for (int i = 0; i < num_blinks; i++) {

       rslt = set_value(HIGH, num);

       usleep(500000);     // Temps en µS, et sleep(xx) = temps en secondes

       rslt = set_value(LOW, num);

       usleep(500000);

   }

   rslt = set_value(LOW, num);

   rslt = set_direction("in", num);

   rslt = unexport_pin(num);

   return EXIT_SUCCESS;

}

Qt 

https://linuxhint.com/install-qt-creator-raspberry-pi/