h3n3/darkwater_python_640
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added correction factor

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shrkey
2016-08-15 20:30:58 +01:00
parent 6b2e637272
commit 95d9be87cd
2 changed files with 4 additions and 4 deletions
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darkwater_640/PCA9685.py
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@@ -83,7 +83,7 @@ class PCA9685(object):
self._device.write8(MODE1, mode1)
time.sleep(0.005) # wait for oscillator
def set_pwm_freq(self, freq_hz):
def set_pwm_freq(self, freq_hz, correctionFactor=1.0):
"""Set the PWM frequency to the provided value in hertz."""
prescaleval = 25000000.0 # 25MHz
prescaleval /= 4096.0 # 12-bit
@@ -91,7 +91,7 @@ class PCA9685(object):
prescaleval -= 1.0
logger.debug('Setting PWM frequency to {0} Hz'.format(freq_hz))
logger.debug('Estimated pre-scale: {0}'.format(prescaleval))
prescale = int(math.floor(prescaleval + 0.5))
prescale = round(prescaleval * correctionFactor + 0.5)
logger.debug('Final pre-scale: {0}'.format(prescale))
oldmode = self._device.readU8(MODE1);
newmode = (oldmode & 0x7F) | 0x10 # sleep