denis
89 lines
2.2 KiB
Python
89 lines
2.2 KiB
Python
'''
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Created on 29 août 2022
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@author: denis
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'''
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import logging
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import threading
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from RPLCD.i2c import CharLCD
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logger = logging.getLogger(__name__)
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logging.basicConfig(level=logging.INFO)
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#lcd = CharLCD(settings.LCD_EXPANDER, settings.LCD_ADDR, port=settings.LCD_PORT)
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class LCD():
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def __init__(self, lcd, timeout=None):
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self.lcd = lcd
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self.waiter = threading.Event()
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self.cols = 16
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self.timeout = timeout
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self.screen_enabled = True
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@property
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def screen_enabled(self):
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return self._enabled
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@screen_enabled.setter
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def screen_enabled(self, v):
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self.lcd.backlight_enabled = v
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self._enabled = v
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def create_char(self, pos, cc):
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self.lcd.create_char(pos, cc)
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# LCD display
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def _display(self, event, msg, timeout):
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self.screen_enabled = True
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self.lcd.clear()
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self.lcd.write_string(msg)
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event.wait(timeout)
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self.screen_enabled = False
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def write_msg(self, msg, timeout=5):
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if not self.waiter.is_set():
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self.waiter.set()
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self.waiter = threading.Event()
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threading.Thread(target=self._display, args=(self.waiter, msg, timeout, )).start()
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def _screen_enable(self, event, timeout):
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self.screen_enabled = True
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event.wait(timeout)
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self.screen_enabled = False
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def screen_disable(self):
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if not self.waiter.is_set():
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self.waiter.set()
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self.screen_enabled = False
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def screen_enable(self):
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if self.timeout is not None:
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if not self.waiter.is_set():
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self.waiter.set()
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self.waiter = threading.Event()
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threading.Thread(target=self._screen_enable, args=(self.waiter, self.timeout, )).start()
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else:
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self.screen_enabled = True
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def display(self, msg, pos=(0, 0), align=None, clear=True):
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self.screen_enable()
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if clear:
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self.lcd.clear()
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self.lcd.cursor_pos = pos
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if align=='left':
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self.lcd.write_string(msg.ljust(self.cols))
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elif align=='right':
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self.lcd.write_string(msg.rjust(self.cols))
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else:
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self.lcd.write_string(msg)
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