This is a GPIO access library for NanoPI. It is based on the WiringOP for Orange PI which is based on original WiringPi for Raspberry Pi.
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README.md

WiringNP

This is a GPIO access library for NanoPi. It is based on the WiringOP for Orange PI which is based on original WiringPi for Raspberry Pi.

Currently supported boards:
NanoPi Neo
NanoPi Neo Air
NanoPi Duo
NanoPi Duo2
NanoPi NEO2
NanoPi NEO Plus2
NanoPi M1
NanoPi M1 Plus
NanoPi NEO Core
NanoPi NEO Core2
NanoPi K1 Plus

Installation

Install WiringNP

Log into your nano board via SSH, open a terminal and install the WiringNP library by running the following commands:

git clone https://github.com/friendlyarm/WiringNP
cd WiringNP/
chmod 755 build
./build

Verify WiringNP

The WiringNP library contains a set of gpio commands. Users can use them to access the GPIO pins on a nano board. You can verify your WiringNP by running the following command:

gpio readall

If your installation is successful the following messages will show up. Here is the message list for NanoPi NEO Core:

root@FriendlyARM:~# gpio readall
  +-----+-----+----------+------+---+-NanoPi-NEO-Core--+------+----------+-----+-----+
 | BCM | wPi |   Name   | Mode | V | Physical | V | Mode | Name     | wPi | BCM |
 +-----+-----+----------+------+---+----++----+---+------+----------+-----+-----+
 |     |     |     3.3v |      |   |  1 || 2  |   |      | 5v       |     |     |
 |  12 |   8 |  GPIOA12 | ALT5 | 0 |  3 || 4  |   |      | 5v       |     |     |
 |  11 |   9 |  GPIOA11 | ALT5 | 0 |  5 || 6  |   |      | 0v       |     |     |
 | 203 |   7 |  GPIOG11 |  OUT | 1 |  7 || 8  | 0 | ALT5 | GPIOG6   | 15  | 198 |
 |     |     |       0v |      |   |  9 || 10 | 0 | ALT5 | GPIOG7   | 16  | 199 |
 |   0 |   0 |   GPIOA0 |  OUT | 0 | 11 || 12 | 1 | OUT  | GPIOA6   | 1   | 6   |
 |   2 |   2 |   GPIOA2 |  OFF | 0 | 13 || 14 |   |      | 0v       |     |     |
 |   3 |   3 |   GPIOA3 |  OFF | 0 | 15 || 16 | 0 | OFF  | GPIOG8   | 4   | 200 |
 |     |     |     3.3v |      |   | 17 || 18 | 0 | ALT2 | GPIOG9   | 5   | 201 |
 |  64 |  12 |   GPIOC0 | ALT4 | 0 | 19 || 20 |   |      | 0v       |     |     |
 |  65 |  13 |   GPIOC1 | ALT4 | 0 | 21 || 22 | 1 | OUT  | GPIOA1   | 6   | 1   |
 |  66 |  14 |   GPIOC2 | ALT4 | 0 | 23 || 24 | 1 | OUT  | GPIOC3   | 10  | 67  |
 +-----+-----+----------+------+---+----++----+---+------+----------+-----+-----+
 | BCM | wPi |   Name   | Mode | V | Physical | V | Mode | Name     | wPi | BCM |
 +-----+-----+----------+------+---+-NanoPi-NEO-Core--+------+----------+-----+-----+

 +-----+-----+----------+---- NanoPi-NEO-Core USB/Audio ----+----------+-----+-----+
 | BCM | wPi |   Name   | Mode | V | Physical | V | Mode | Name     | wPi | BCM |
 +-----+-----+----------+------+---+----++----+---+------+----------+-----+-----+
 |     |     |       5v |      |   | 25 || 26 | 0 | ALT4 | GPIOA15  | 22  | 15  |
 |     |     |     USB1 |      |   | 27 || 28 | 0 | ALT4 | GPIOA16  | 23  | 16  |
 |     |     |     USB1 |      |   | 29 || 30 | 0 | ALT4 | GPIOA14  | 21  | 14  |
 |     |     |     USB2 |      |   | 31 || 32 | 0 | ALT4 | GPIOA13  | 20  | 13  |
 |     |     |     USB2 |      |   | 33 || 34 |   |      | Mic      |     |     |
 |     |     |       IR |      |   | 35 || 36 |   |      | Mic      |     |     |
 |  17 |  19 |  GPIOA17 |  OFF | 0 | 37 || 38 |   |      | Audio    |     |     |
 |     |     |      I2S |      |   | 39 || 40 |   |      | Audio    |     |     |
 |     |     |      I2S |      |   | 41 || 42 | 0 | ALT5 | GPIOA5   | 18  | 5   |
 |     |     |      I2S |      |   | 43 || 44 | 0 | ALT5 | GPIOA4   | 17  | 4   |
 |     |     |      I2S |      |   | 45 || 46 |   |      | 5V       |     |     |
 |     |     |       0v |      |   | 47 || 48 |   |      | 0v       |     |     |
 +-----+-----+----------+------+---+----++----+---+------+----------+-----+-----+
 | BCM | wPi |   Name   | Mode | V | Physical | V | Mode | Name     | wPi | BCM |
 +-----+-----+----------+------+---+-NanoPi-NEO-Core--+------+----------+-----+-----+

 +-----+-----+----------+---- NanoPi-NEO-Core Network ----+----------+-----+-----+
 | BCM | wPi |   Name   | Mode | V | Physical | V | Mode | Name     | wPi | BCM |
 +-----+-----+----------+------+---+----++----+---+------+----------+-----+-----+
 |     |     |      Eth |      |   | 49 || 50 |   |      | Eth      |     |     |
 |     |     |      Eth |      |   | 51 || 52 |   |      | Eth      |     |     |
 |     |     |      Eth |      |   | 53 || 54 |   |      | Eth      |     |     |
 |     |     |       NC |      |   | 55 || 56 |   |      | NC       |     |     |
 |     |     |       NC |      |   | 57 || 58 |   |      | NC       |     |     |
 |     |     |       0v |      |   | 59 || 60 |   |      | 0v       |     |     |
 |     |     |     USB3 |      |   | 61 || 62 | 0 | OFF  | GPIOA7   | 24  | 7   |
 |     |     |     USB3 |      |   | 63 || 64 |   |      | GPIOE12  |     |     |
 |     |     |       5v |      |   | 65 || 66 |   |      | GPIOE13  |     |     |
 |     |     |       5v |      |   | 67 || 68 |   |      | 3.3v     |     |     |
 +-----+-----+----------+------+---+----++----+---+------+----------+-----+-----+
 | BCM | wPi |   Name   | Mode | V | Physical | V | Mode | Name     | wPi | BCM |
 +-----+-----+----------+------+---+-NanoPi-NEO-Core--+------+----------+-----+-----+

Code Sample with WiringNP

connect a LED module to a NanoPi (Pin7), Make a C source file:

vi test.c

Type the following lines:

#include <wiringPi.h>
int main(void)
{
  wiringPiSetup() ;
  pinMode (7, OUTPUT) ;
  for(;;)
  {
    digitalWrite(7, HIGH) ;
    delay (500) ;
    digitalWrite(7,  LOW) ;
    delay (500) ;
  }
}

Compile and run "test.c":

gcc -Wall -o test test.c -lwiringPi -lpthread
sudo ./test

You can see the LED is blinking.

PWM Code Sample

The PWM pin in NanoPi NEO/NEO2 is multiplexing which can be set to either PWM or SerialPort0. To set this pin to PWM you need to run "sudo npi-config" and enter the "Advanced Options" menu to Enable/Disable PWM. Note: after PWM is enabled SerialPort0 will not be accessed and you need to login your board via SSH.

connect a Buzzer to a NanoPi NEO2, create a source file in C:

vi pwmtest.c

Type the following code:

#include <wiringPi.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
int main (void)
{
  int l ;
  printf ("PWM test program\n") ;
 
  //using wiringPi Pin Number
  int pin = 18;              
  if (wiringPiSetup () == -1)
    exit (1) ;               
 
  /*
  //using Physical Pin Number
  int pin = 38;              
  if (wiringPiSetupPhys() == -1)
    exit (1) ;                  
  */                            
 
  /*
  //using BCM Pin Number
  int pin = 5;          
  if (wiringPiSetupGpio() == -1)
    exit (1);                   
  */                            
 
  pinMode (pin, PWM_OUTPUT);
  for (;;) {                      
    for (l = 0 ; l < 1024 ; ++l) {
      pwmWrite (pin, l) ;         
      delay (1) ;        
    }                              
    for (l = 1023 ; l >= 0 ; --l) {
      pwmWrite (pin, l) ;          
      delay (1) ;        
    }            
  }         
  return 0 ;
}

Compile the pwmtest.c file and run the generated executable:

gcc -Wall -o pwmtest pwmtest.c -lwiringPi -lpthread
./pwmtest

Connect a PWM beeper to a NEO/NEO2 and the beeper will sound.