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Added get_channels() method to PCA9685 driver

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This commit is contained in:
Fabio Manganiello 2021-05-16 17:51:51 +02:00
parent 132c659d3c
commit abf793e703
1 changed files with 29 additions and 2 deletions
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31
platypush/plugins/pwm/pca9685.py
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@ -32,6 +32,7 @@ class PwmPca9685Plugin(Plugin):
MIN_PWM_VALUE = 0
MAX_PWM_VALUE = 0xffff
N_CHANNELS = 16
def __init__(self, frequency: float, step_value: float = 0.1, step_duration: float = 0.05, **kwargs):
"""
@ -48,13 +49,23 @@ class PwmPca9685Plugin(Plugin):
@staticmethod
def _convert_percent_to_duty_cycle(value: float) -> int:
"""
Convert a duty cycle percentage value to a PCA9685 value between 0 and `0xffff`.
Convert a duty cycle percentage value to a PCA9685 value between 0 and ``0xffff``.
:param value: Duty cycle value, between 0 and 1.
:return: Duty cycle 16-bit value, between 0 and `0xffff`.
:return: Duty cycle 16-bit value, between 0 and ``0xffff``.
"""
return int(value * 65535)
@staticmethod
def _convert_duty_cycle_to_percent(value: int) -> float:
"""
Convert a PCA9685 duty cycle value value to a percentage value.
:param value: Duty cycle 16-bit value, between 0 and ``0xffff``.
:return: Duty cycle percentage, between 0 and 1.
"""
return value / 65535
@action
def execute(self, channels: Dict[int, float], frequency: Optional[float] = None, step_value: Optional[float] = None,
step_duration: Optional[float] = None):
@ -97,6 +108,22 @@ class PwmPca9685Plugin(Plugin):
time.sleep(step_duration)
@action
def get_channels(self) -> Dict[int, float]:
"""
Get the current duty cycle value of the channels.
:return: A map in the format ``channel_index -> value``, where ``value`` is the duty cycle of the associated
channel, as a percentage value between 0 and 1.
"""
if not self._pca:
return {i: 0 for i in range(self.N_CHANNELS)}
return {
i: self._convert_duty_cycle_to_percent(channel.duty_cycle)
for i, channel in enumerate(self._pca.channels)
}
@action
def deinit(self):
"""