second commit

relaycontroller/modules/lcd.py

@@ -0,0 +1,88 @@
+'''
+Created on 29 août 2022
+
+@author: denis
+'''
+import logging
+import threading
+from RPLCD.i2c import CharLCD
+
+logger = logging.getLogger(__name__)
+logging.basicConfig(level=logging.INFO)
+
+#lcd = CharLCD(settings.LCD_EXPANDER, settings.LCD_ADDR, port=settings.LCD_PORT)
+
+
+class LCD():
+    def __init__(self, lcd, timeout=None):
+        self.lcd = lcd
+        self.waiter = threading.Event()
+        self.cols = 16
+        self.timeout = timeout
+        self.screen_enabled = True
+
+    @property
+    def screen_enabled(self):
+        return self._enabled
+
+    @screen_enabled.setter
+    def screen_enabled(self, v):
+        self.lcd.backlight_enabled = v
+        self._enabled = v
+
+
+    def create_char(self, pos, cc):
+        self.lcd.create_char(pos, cc)
+
+
+    # LCD display
+    def _display(self, event, msg, timeout):
+        self.screen_enabled = True
+        self.lcd.clear()
+        self.lcd.write_string(msg)
+        event.wait(timeout)
+        self.screen_enabled = False
+
+
+    def write_msg(self, msg, timeout=5):
+        if not self.waiter.is_set():
+            self.waiter.set()
+        self.waiter = threading.Event()
+        threading.Thread(target=self._display, args=(self.waiter, msg, timeout, )).start()
+
+
+    def _screen_enable(self, event, timeout):
+        self.screen_enabled = True
+        event.wait(timeout)
+        self.screen_enabled = False
+
+
+    def screen_disable(self):
+        if not self.waiter.is_set():
+            self.waiter.set()
+        self.screen_enabled = False
+
+
+    def screen_enable(self):
+        if self.timeout is not None:
+            if not self.waiter.is_set():
+                self.waiter.set()
+            self.waiter = threading.Event()
+            threading.Thread(target=self._screen_enable, args=(self.waiter, self.timeout, )).start()
+        else:
+            self.screen_enabled = True
+
+
+    def display(self, msg, pos=(0, 0), align=None, clear=True):
+        self.screen_enable()
+
+        if clear:
+            self.lcd.clear()
+        self.lcd.cursor_pos = pos
+        if align=='left':
+            self.lcd.write_string(msg.ljust(self.cols))
+        elif align=='right':
+            self.lcd.write_string(msg.rjust(self.cols))
+        else:
+            self.lcd.write_string(msg)
+