RaspberryPi学习教程系列3（编程实验篇-双色LED实验）

#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)
",LedPin); //when initialize wiring successfully,print message to screen

    ledInit();

    while(1){
        ledColorSet(0x55,0x55);   //red    
        delay(5000);
        ledColorSet(0x00,0xff);   //green
        delay(5000);
        ledColorSet(0xff,0x45);    
        delay(500);
        ledColorSet(0xff,0xff);    
        delay(500);
        ledColorSet(0x7c,0xfc);    
        delay(500);
    }

    return 0;
}

#!/usr/bin/env python
import RPi.GPIO as GPIO
import time

colors = [0xFF00, 0x00FF, 0x0FF0, 0xF00F]
pins = {'pin_R':11, 'pin_G':12}  # pins is a dict

GPIO.setmode(GPIO.BOARD)       # Numbers GPIOs by physical location
for i in pins:
    GPIO.setup(pins[i], GPIO.OUT)   # Set pins' mode is output
    GPIO.output(pins[i], GPIO.HIGH) # Set pins to high(+3.3V) to off led

p_R = GPIO.PWM(pins['pin_R'], 2000)  # set Frequece to 2KHz
p_G = GPIO.PWM(pins['pin_G'], 2000)

p_R.start(0)      # Initial duty Cycle = 0(leds off)
p_G.start(0)

def map(x, in_min, in_max, out_min, out_max):
    return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min

def setColor(col):   # For example : col = 0x112233
    R_val = (col & 0x1100) >> 8
    G_val = (col & 0x0011) >> 0
    
    R_val = map(R_val, 0, 255, 0, 100)
    G_val = map(G_val, 0, 255, 0, 100)
    
    p_R.ChangeDutyCycle(R_val)     # Change duty cycle
    p_G.ChangeDutyCycle(G_val)

def loop():
    while True:
        for col in colors:
            setColor(col)
            time.sleep(0.5)

def destroy():
    p_R.stop()
    p_G.stop()
    for i in pins:
        GPIO.output(pins[i], GPIO.HIGH)    # Turn off all leds
    GPIO.cleanup()

if __name__ == "__main__":
    try:
        loop()
    except KeyboardInterrupt:
        destroy()

var rpio = require('rpio');

//  打开 GPIO17 针脚 作为输出
rpio.open(11, rpio.OUTPUT);

function blink(){
　　 // 指定 GPIO17 输出电流 高电平
    rpio.write(11, rpio.HIGH);
    setTimeout(function(){
　　　　 // 指定 GPIO17 停止输出（LOW）
        rpio.write(11, rpio.LOW);
        rpio.open(12, rpio.OUTPUT);
        rpio.write(12, rpio.HIGH);
    },1000)
}


setInterval(blink, 2000);