NetworkSwitch/gpioFileSystem.h at main · AnthonyMLau/NetworkSwitch · GitHub

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#include <errno.h>

#include <fcntl.h>

#include <stdio.h>

#include <stdlib.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <unistd.h>

#include <string.h>

void exportPin(int pin){

int fd;

char buf[100];

//Export the specific GPIO

//this will create a new folder with the gpio name

sprintf(buf, "%d", pin);

fd = open("/sys/class/gpio/export", O_WRONLY);

if (fd < 0){

perror("Unable to open /sys/class/gpio/export");

}

write(fd, buf, strlen(buf));

close(fd);

return;

}

void setDirectionOut(int pin){

// Set the pin to be an output by writing "out" to /sys/class/gpio/gpio24/direction

int fd;

char buf[100];

//Set the direction of the GPIO to output

sprintf(buf, "/sys/class/gpio/gpio%d/direction", pin);

fd = open(buf, O_WRONLY);

if (fd < 0){

perror("Unable to open /sys/class/gpio/export");

}

write(fd, "out", 3); // Set out direction

close(fd);

}

void setDirectionIn(int pin){

// Set the pin to be an output by writing "in" to /sys/class/gpio/gpio24/direction

int fd;

char buf[100];

//Set the direction of the GPIO to output

sprintf(buf, "/sys/class/gpio/gpio%d/direction", pin);

fd = open(buf, O_WRONLY);

if (fd < 0){

perror("Unable to open /sys/class/gpio/export");

}

write(fd, "in", 2); // Set in direction

close(fd);

}

void writePin(int fd, int pin, char val){

if (fd == -1) {

perror("Unable to open /sys/class/gpio/export");

return;

}

write(fd, &val, 1);

}

void readPin(int fd, int pin, char &val){

if (fd == -1) {

perror("Unable to open /sys/class/gpio/export");

return;

}

read(fd, &val, 1);

}

NetworkSwitch/gpioFileSystem.h at main · AnthonyMLau/NetworkSwitch · GitHub

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