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 NEO2
NanoPI M1
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
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/
git checkout nanopi-m1
chmod 755 build
./build
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 NEO2:
root@FriendlyARM:~# gpio readall
+-----+-----+----------+------+---+-NanoPi NEO/NEO2--+------+----------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+----------+------+---+----++----+---+------+----------+-----+-----+
| | | 3.3V | | | 1 || 2 | | | 5V | | |
| 12 | 8 | GPIOA12 | OFF | 0 | 3 || 4 | | | 5V | | |
| 11 | 9 | GPIOA11 | OFF | 0 | 5 || 6 | | | 0v | | |
| 203 | 7 | GPIOG11 | OUT | 1 | 7 || 8 | 0 | OFF | GPIOG6 | 15 | 198 |
| | | 0v | | | 9 || 10 | 0 | OFF | GPIOG7 | 16 | 199 |
| 0 | 0 | GPIOA0 | OFF | 0 | 11 || 12 | 0 | OFF | 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 | OFF | GPIOG9 | 5 | 201 |
| 64 | 12 | GPIOC0 | OFF | 0 | 19 || 20 | | | 0v | | |
| 65 | 13 | GPIOC1 | OFF | 0 | 21 || 22 | 0 | OFF | GPIOA1 | 6 | 1 |
| 66 | 14 | GPIOC2 | OFF | 0 | 23 || 24 | 0 | OFF | GPIOC3 | 10 | 67 |
+-----+-----+----------+------+---+----++----+---+------+----------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+----------+------+---+-NanoPi NEO/NEO2--+------+----------+-----+-----+
+-----+----NanoPi NEO/NEO2 Debug UART-+----+
| BCM | wPi | Name | Mode | V | Ph |
+-----+-----+----------+------+---+----+
| 4 | 17 | GPIOA4 | ALT5 | 0 | 37 |
| 5 | 18 | GPIOA5 | ALT4 | 0 | 38 |
+-----+-----+----------+------+---+----+
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.
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.