Orange Pi one Armbian Mod 2 GPIO control

[david]

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How to control GPIO on Orange Pi one using Armbian Mod 2

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1. To control the GPIO pins on the Orange Pi One, we can use the SysFS interface provided by the Linux kernel. Here's an example of GPIO control using the SysFS interface:
This example use :GPIO pin PA3

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#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

#define GPIO_PIN        3    // GPIO pin number for the LED (PA3)

int main(void) {
    int fd;
    char buf[64];

    // Open the GPIO value file for writing
    if ((fd = open("/sys/class/gpio/export", O_WRONLY)) < 0) {
        printf("Failed to open GPIO export.\n");
        return 1;
    }

    // Export the desired GPIO pin
    snprintf(buf, sizeof(buf), "%d", GPIO_PIN);
    write(fd, buf, strlen(buf));
    close(fd);

    // Open the direction file for writing
    snprintf(buf, sizeof(buf), "/sys/class/gpio/gpio%d/direction", GPIO_PIN);
    if ((fd = open(buf, O_WRONLY)) < 0) {
        printf("Failed to open GPIO direction.\n");
        return 1;
    }

    // Set the pin as output
    write(fd, "out", 3);
    close(fd);

    // Open the value file for writing
    snprintf(buf, sizeof(buf), "/sys/class/gpio/gpio%d/value", GPIO_PIN);
    if ((fd = open(buf, O_WRONLY)) < 0) {
        printf("Failed to open GPIO value.\n");
        return 1;
    }

    while (1) {
        // Turn on the LED
        write(fd, "1", 1);
        usleep(1000000);  // Delay for 1 second

        // Turn off the LED
        write(fd, "0", 1);
        usleep(1000000);  // Delay for 1 second
    }

    // Close the GPIO value file
    close(fd);

    // Open the GPIO unexport file for writing
    if ((fd = open("/sys/class/gpio/unexport", O_WRONLY)) < 0) {
        printf("Failed to open GPIO unexport.\n");
        return 1;
    }

    // Unexport the GPIO pin
    snprintf(buf, sizeof(buf), "%d", GPIO_PIN);
    write(fd, buf, strlen(buf));
    close(fd);

    return 0;
}

Copy the code to blink.c file and compile with this command.

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 g++ blink.c -o blink

Run blink file as root:

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./blink

2.Second method is using Wiring Pi lib that use Arduino like C code to control GPIO pins:

Download and install Wiring Pi for Orange Pi.

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# apt-get update
# apt-get install -y git
# git clone https://github.com/orangepi-xunlong/wiringOP.git

How to build wiringOP

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# cd wiringOP
# ./build clean
# ./build 

Now from terminal:

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gpio write 8 1
gpio write 8 0

You are sending command "1" "turn on" or "0" turn off !
It use same pin as previous example PA3


3.How to Create C program example for controlling GPIO using Wiring Pi.


Creare file blink.c and copy this code into the file!

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#include <stdio.h>
#include <wiringPi.h>

#define LED 8 // GPIO pin number for the LED

int main(void) {

 wiringPiSetup () ;
 pinMode (LED, OUTPUT) ;

    while (1) {
        digitalWrite(LED, HIGH); // Turn on the LED
        delay(1000); // Delay for 1 second
        digitalWrite(LED, LOW); // Turn off the LED
        delay(1000); // Delay for 1 second
    }

    return 0;
}

Compile and run the blink program!

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g++ blink.c -o blink -lwiringPi

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./blink

[pepeloke]

I tryed this simple C program it works also with Orange Pi PC !