原理图：
树梅派学习 5. RGB LED实验_d3
接线：
树梅派学习 5. RGB LED实验_#include_02

c语言程序：

#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)\n",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;
}

编译运行：

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