README.md

wiringNPi

wiringNPi, a GPIO library for friendly arm nano pi 2, which featured samsung s5p4418 soc.

中文HOWTO

提示

理论上库适用于所有使用友善之臂s5p4418芯片的板子。 PWM依赖于matrix_pwm内核模块，首先开机加载该模块。 编辑/etc/modules，添加如下内容。

matrix_pwm

安装前

只需要安装基本的编译工具即可

# apt-get install build-essential

编译以及安装

进入源码目录

make
make install

开始使用wiringNPi

要使用wiringNPi库，只需要在你的代码中#include <wiringNPi.h>，编译的时候链接wiringNPi库，即编译的时候加上-lwiringNPi参数。如

gcc main.c -lwiringNPi -o main

demo

#include <stdio.h>
#include <stdlib.h>
#include <wiringNPi.h>
#include <wiringNPiSPI.h>


int main(int argc, char * argv[])
{
	int i = 0;
	//You must setup first.
	wiringNPiSetup();

	//GPIO RW
	pinMode(GPIOC(12), OUTPUT);

	for(i = 0; i < 100000; i++)
	{
		digitalWrite(GPIOC(12), HIGH);
		digitalWrite(GPIOC(12), LOW);
	}

	//PWM R/W
	analogWrite(PWM0, 1000000, 200);
	delay(500);

	analogWrite(PWM1, 1000000, 900);

	//You can delay in ms
	delay(500);

	//You can also delay in us
	delayMicroseconds (1000);


	//Stop pwm.
	analogStop(PWM0);
	analogStop(PWM1);



	//Setup SPI first.
	wiringNPiSPISetup(SPI0_CHANNEL0, 100000);

	unsigned char spi_buf[100] = {};

	for(i = 0; i < 30; i++)
	{
		spi_buf[i] = i + '0';
	}

	wiringNPiSPIDataRW(SPI0_CHANNEL0, spi_buf, 30);

	for(i = 0; i < 30; i++)
	{
		printf("%c\n", spi_buf[i]);
	}

	return EXIT_SUCCESS;

}