树梅派学习 4. 双色LED实验

安装面包板软件：
fritzing

实体接线：

到树梅派新建文件 ：
/home/pi/study/01.DualLED/C
新建：
dule_color_led.c

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

#define uchar unsigned char

#define LedPinRed    0
#define LedPinGreen  1

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

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

int main(void)
{
    int i;

    if(wiringPiSetup() == -1){ //when initialize wiring failed,print messageto 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);   //red 
        delay(500);
        ledColorSet(0x00,0xff);   //green
        delay(500);
        ledColorSet(0xff,0x45); 
        delay(500);
        ledColorSet(0xff,0xff); 
        delay(500);
        ledColorSet(0x7c,0xfc); 
        delay(500);
    }

    return 0;
}

编译运行：

gcc dule_color_led.c -o led -lwiringPi -lpthread
./led

运行结果可以看到双色灯红、黄交替闪烁。