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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| # Copyright 2019 PeppyMeter peppy.player@gmail.com | ||
| # | ||
| # This file is part of PeppyMeter. | ||
| # | ||
| # PeppyMeter is free software: you can redistribute it and/or modify | ||
| # it under the terms of the GNU General Public License as published by | ||
| # the Free Software Foundation, either version 3 of the License, or | ||
| # (at your option) any later version. | ||
| # | ||
| # PeppyMeter is distributed in the hope that it will be useful, | ||
| # but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| # GNU General Public License for more details. | ||
| # | ||
| # You should have received a copy of the GNU General Public License | ||
| # along with PeppyMeter. If not, see <http://www.gnu.org/licenses/>. | ||
|
|
||
| import time | ||
| import sys | ||
| import logging | ||
|
|
||
| from threading import Thread | ||
| from configfileparser import PWM_INTERFACE, FREQUENCY, GPIO_PIN_LEFT, GPIO_PIN_RIGHT, UPDATE_PERIOD | ||
|
|
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| class DummyPWM(object): | ||
| """ Dummy PWM class used for development on Windows platform """ | ||
|
|
||
| def __init__(self): | ||
| """ Initializer """ | ||
|
|
||
| pass | ||
|
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| def start(self, value): | ||
| """ Dummy start """ | ||
|
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| pass | ||
|
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| def ChangeDutyCycle(self, value): | ||
| """ Dummy change duty cycle """ | ||
|
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| pass | ||
|
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| def stop(self, value): | ||
| """ Dummy stop """ | ||
|
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| pass | ||
|
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| class PWMInterface(object): | ||
| """ PWM interface class. | ||
| Can be used with devices controlled by means of PWM signal e.g. LED, gas tubes etc. | ||
| """ | ||
| def __init__(self, config, data_source): | ||
| """ Initializer """ | ||
|
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| self.data_source = data_source | ||
|
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| self.frequency = config[PWM_INTERFACE][FREQUENCY] | ||
| self.gpio_pin_left = config[PWM_INTERFACE][GPIO_PIN_LEFT] | ||
| self.gpio_pin_right = config[PWM_INTERFACE][GPIO_PIN_RIGHT] | ||
| self.update_period = config[PWM_INTERFACE][UPDATE_PERIOD] | ||
|
|
||
| if "win" in sys.platform: | ||
| self.left = DummyPWM() | ||
| self.right = DummyPWM() | ||
| else: | ||
| import RPi.GPIO as gpio | ||
| gpio.setmode(gpio.BCM) | ||
| gpio.setwarnings(False) | ||
|
|
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| gpio.setup(self.gpio_pin_left, gpio.OUT) | ||
| gpio.setup(self.gpio_pin_right, gpio.OUT) | ||
|
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| self.left = gpio.PWM(self.gpio_pin_left, self.frequency) | ||
| self.right = gpio.PWM(self.gpio_pin_right, self.frequency) | ||
|
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| self.logging_template = "PWM left: {0} right: {1}" | ||
|
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| def start_writing(self): | ||
| """ Start writing thread """ | ||
|
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| self.running = True | ||
| thread = Thread(target = self.write_data) | ||
| thread.start() | ||
|
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| def write_data(self): | ||
| """ Method of the writing thread """ | ||
|
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| self.left.start(0) | ||
| self.right.start(0) | ||
|
|
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| while self.running: | ||
| time.sleep(self.update_period) | ||
|
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| v = self.data_source.get_value() | ||
|
|
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| if v == 0: | ||
| continue | ||
|
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| logging.debug(v) | ||
| left = float(int(v[0])) | ||
| right = float(int(v[1])) | ||
|
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| logging.debug(self.logging_template.format(left, right)) | ||
|
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| self.left.ChangeDutyCycle(left) | ||
| self.right.ChangeDutyCycle(right) | ||
|
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| def stop_writing(self): | ||
| """ Stop writing thread and stop PWM """ | ||
|
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| self.running = False | ||
| time.sleep(self.update_period) | ||
| self.left.stop() | ||
| self.right.stop() | ||
|
|
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