05_rgb.py 文件源码

def setup():
    global p_R, p_G, p_B
    # Set the GPIO modes to BCM Numbering
    GPIO.setmode(GPIO.BCM)
    # Set all LedPin's mode to output, 
    # and initial level to High(3.3v)
    for i in pins:
        GPIO.setup(pins[i], GPIO.OUT, initial=GPIO.HIGH)

    # Set all led as pwm channel,
    #  and frequece to 2KHz
    p_R = GPIO.PWM(pins['Red'], 2000)
    p_G = GPIO.PWM(pins['Green'], 2000)
    p_B = GPIO.PWM(pins['Blue'], 2000)

    # Set all begin with value 0
    p_R.start(0)
    p_G.start(0)
    p_B.start(0)

# Define a MAP function for mapping values.
# Like from 0~255 to 0~100