1 files changed, 47 insertions, 0 deletions
diff --git a/bin/i2c.py b/bin/i2c.py
new file mode 100644
index 0000000..a79d9d1
--- /dev/null
+++ b/bin/i2c.py
@@ -0,0 +1,47 @@
+import smbus2 as SMBus
+import time
+
+LCD_BACKLIGHT = 0x08
+LCD_NOBACKLIGHT = 0x00
+ENABLE_BIT = 0b00000100
+LINES = {1: 0x80, 2: 0xC0}
+ALIGN_FUNC = {"left": "ljust", "right": "rjust", "center": "center"}
+
+
+class LCD:
+
+    def __init__(self, address=0x27, bus=1, width=20, rows=4, backlight=True):
+        self.address = address
+        self.bus = SMBus(bus)
+        self.width = width
+        self.rows = rows
+        self.backlight_status = backlight
+        self.delay = 0.0005
+
+        for cmd in (0x33, 0x32, 0x06, 0x0C, 0x28, 0x01):
+            self.write(cmd)
+            time.sleep(self.delay)
+
+    def write(self, byte, mode=0):
+        backlight = LCD_BACKLIGHT if self.backlight_status else LCD_NOBACKLIGHT
+        self._write_byte(mode | ((byte << 4) & 0xF0) | backlight)
+
+    def _write_byte(self, byte):
+        self.bus.write_byte(self.address, byte)
+        self.bus.write_byte(self.address, (byte | ENABLE_BIT))
+        time.sleep(self.delay)
+        self.bus.write_byte(self.address, (byte & ~ENABLE_BIT))
+        time.sleep(self.delay)
+
+    def display_text(self, text, line=1, align="left"):
+        self.write(LINES.get(line, LINES[1]))
+        aligned_text = getattr(text, ALIGN_FUNC.get(align, "ljust"))(self.width)
+        for char in aligned_text:
+            self.write(ord(char), mode=1)
+
+    def clear(self):
+        self.write(0x01)
+
+    def set_backlight(self, turn_on=True):
+        self.backlight_status = turn_on
+        self.write(0)