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Merge pull request #154 from waveform80/pwm-active-high

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Fix #143
This commit is contained in:
Dave Jones
2016-01-31 16:18:15 +00:00
parent 741a9b48ed de5dff3c1d
commit 80f0597345
1 changed files with 14 additions and 6 deletions
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20
gpiozero/output_devices.py
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@@ -245,10 +245,10 @@ class PWMOutputDevice(OutputDevice):
The frequency (in Hz) of pulses emitted to drive the device. Defaults The frequency (in Hz) of pulses emitted to drive the device. Defaults
to 100Hz. to 100Hz.
""" """
def __init__(self, pin=None, frequency=100): def __init__(self, pin=None, active_high=True, frequency=100):
self._pwm = None self._pwm = None
self._blink_thread = None self._blink_thread = None
super(PWMOutputDevice, self).__init__(pin) super(PWMOutputDevice, self).__init__(pin, active_high)
try: try:
self._pwm = GPIO.PWM(self.pin, frequency) self._pwm = GPIO.PWM(self.pin, frequency)
self._pwm.start(0.0) self._pwm.start(0.0)
@@ -289,12 +289,18 @@ class PWMOutputDevice(OutputDevice):
The duty cycle of the PWM device. 0.0 is off, 1.0 is fully on. Values The duty cycle of the PWM device. 0.0 is off, 1.0 is fully on. Values
in between may be specified for varying levels of power in the device. in between may be specified for varying levels of power in the device.
""" """
return self._read() if self.active_high:
return self._read()
else:
return 1 - self._read()
@value.setter @value.setter
def value(self, value): def value(self, value):
self._stop_blink() self._stop_blink()
self._write(value) if self._active_high:
self._write(value)
else:
self._write(1 - value)
def on(self): def on(self):
self._stop_blink() self._stop_blink()
@@ -392,6 +398,8 @@ class PWMOutputDevice(OutputDevice):
for i in range(int(50 * fade_out_time)) for i in range(int(50 * fade_out_time))
] ]
sequence.append((0.0, off_time)) sequence.append((0.0, off_time))
if not self.active_high:
sequence = [(1 - value, delay) for (value, delay) in sequence]
sequence = ( sequence = (
cycle(sequence) if n is None else cycle(sequence) if n is None else
chain.from_iterable(repeat(sequence, n)) chain.from_iterable(repeat(sequence, n))
@@ -458,11 +466,11 @@ class RGBLED(SourceMixin, CompositeDevice):
:param int blue: :param int blue:
The GPIO pin that controls the blue component of the RGB LED. The GPIO pin that controls the blue component of the RGB LED.
""" """
def __init__(self, red=None, green=None, blue=None): def __init__(self, red=None, green=None, blue=None, active_high=True):
if not all([red, green, blue]): if not all([red, green, blue]):
raise OutputDeviceError('red, green, and blue pins must be provided') raise OutputDeviceError('red, green, and blue pins must be provided')
super(RGBLED, self).__init__() super(RGBLED, self).__init__()
self._leds = tuple(PWMLED(pin) for pin in (red, green, blue)) self._leds = tuple(PWMLED(pin, active_high) for pin in (red, green, blue))
red = _led_property(0) red = _led_property(0)
green = _led_property(1) green = _led_property(1)