树莓派RGB LED实验(C程序)

一、接线图

   按照下图将RGB LED接到树莓派上。

二、C程序

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

#define uchar unsigned char

#define LedPinRed    0
#define LedPinGreen  1
#define LedPinBlue   2

void ledInit(void)
{
	softPwmCreate(LedPinRed,  0, 100);
	softPwmCreate(LedPinGreen,0, 100);
	softPwmCreate(LedPinBlue, 0, 100);
}

void ledColorSet(uchar r_val, uchar g_val, uchar b_val)
{
	softPwmWrite(LedPinRed,   r_val);
	softPwmWrite(LedPinGreen, g_val);
	softPwmWrite(LedPinBlue,  b_val);
}

int main(void)
{
	int i;

	if(wiringPiSetup() == -1){ //when initialize wiring failed, print message to screen
		printf("setup wiringPi failed !");
		return 1; 
	}
	//printf("linker LedPin : GPIO %d(wiringPi pin)
",LedPin); //when initialize wiring successfully,print message to screen

	ledInit();

	while(1){
		ledColorSet(0xff,0x00,0x00);   //red	
		delay(500);
		ledColorSet(0x00,0xff,0x00);   //green
		delay(500);
		ledColorSet(0x00,0x00,0xff);   //blue
		delay(500);

		ledColorSet(0xff,0xff,0x00);   //yellow
		delay(500);
		ledColorSet(0xff,0x00,0xff);   //pick
		delay(500);
		ledColorSet(0xc0,0xff,0x3e);
		delay(500);

		ledColorSet(0x94,0x00,0xd3);
		delay(500);
		ledColorSet(0x76,0xee,0x00);
		delay(500);
		ledColorSet(0x00,0xc5,0xcd);	
		delay(500);

	}

	return 0;
}

三、程序运行

gcc rgb_led.c -o rgb_led -lwiringPi -lpthread 
./rgb_led