Merge pull request #22 from malwareslayer/master

Adding Liquid Crystal Display I2C Example

Author: MrYsLab

examples/i2c_liquidcrystaldisplay.py

@@ -0,0 +1,213 @@
+from time import sleep
+from pymata4 import pymata4
+from typing import (
+    AnyStr
+)
+
+
+class LiquidCrystal_I2C:
+    LCD_CLEARDISPLAY = 0x01
+    LCD_RETURNHOME = 0x02
+    LCD_ENTRYMODESET = 0x04
+    LCD_DISPLAYCONTROL = 0x08
+    LCD_CURSORSHIFT = 0x10
+    LCD_FUNCTIONSET = 0x20
+    LCD_SETCGRAMADDR = 0x40
+    LCD_SETDDRAMADDR = 0x80
+
+    LCD_ENTRYRIGHT = 0x00
+    LCD_ENTRYLEFT = 0x02
+    LCD_ENTRYSHIFTINCREMENT = 0x01
+    LCD_ENTRYSHIFTDECREMENT = 0x00
+
+    LCD_DISPLAYON = 0x04
+    LCD_DISPLAYOFF = 0x00
+    LCD_CURSORON = 0x02
+    LCD_CURSOROFF = 0x00
+    LCD_BLINKON = 0x01
+    LCD_BLINKOFF = 0x00
+
+    LCD_DISPLAYMOVE = 0x08
+    LCD_CURSORMOVE = 0x00
+    LCD_MOVERIGHT = 0x04
+    LCD_MOVELEFT = 0x00
+
+    LCD_8BITMODE = 0x10
+    LCD_4BITMODE = 0x00
+    LCD_2LINE = 0x08
+    LCD_1LINE = 0x00
+    LCD_5x10DOTS = 0x04
+    LCD_5x8DOTS = 0x00
+
+    LCD_BACKLIGHT = 0x08
+    LCD_NOBACKLIGHT = 0x00
+
+    ENABLE_BIT = 0B00000100  # Enable bit
+    READ_WRITE_BIT = 0B00000010  # Read/Write bit
+    REGISTER_SELECT_BIT = 0B00000001  # Register select bit
+
+    _backlight_value: int = LCD_NOBACKLIGHT
+    _display_function: int = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS
+    _numlines: int = None
+    _display_control: int = None
+    _display_mode: int = None
+    _oled: bool = True
+
+    def write(self, value: int):
+        self.send(value, self.REGISTER_SELECT_BIT)
+
+    def __init__(self, address: int, column: int, row: int, board: pymata4.Pymata4, dotsize: int = 1) -> None:
+        self.address: int = address
+        self.column: int = column
+        self.row: int = row
+        if not isinstance(board, pymata4.Pymata4):
+            raise AttributeError("argument board not from pymata4.Pymata4")
+        else:
+            self.board: pymata4.Pymata4 = board
+
+        self.begin(self.column, self.row, dotsize=dotsize)
+
+    def begin(self, column: int, lines: int, dotsize: int = LCD_5x8DOTS) -> None:
+        self.board.set_pin_mode_i2c()
+
+        if lines >= 1:
+            self._display_function = self._display_function | self.LCD_2LINE
+
+        self._numlines = lines
+
+        if dotsize != 0 and lines == 1:
+            self._display_function = self._display_function | self.LCD_5x10DOTS
+
+        sleep(0.05)
+
+        self.expander_write(self._backlight_value)
+        sleep(1)
+
+        self.write_4_bits(0x03 << 0x4)
+        sleep(0.0045)
+
+        self.write_4_bits(0x03 << 0x4)
+        sleep(0.0045)
+
+        self.write_4_bits(0x03 << 0x4)
+        sleep(0.00015)
+
+        self.write_4_bits(0x02 << 0x4)
+
+        self.command(self.LCD_FUNCTIONSET | self._display_function)
+
+        self._display_control = self.LCD_DISPLAYON | self.LCD_CURSOROFF | self.LCD_BLINKOFF
+        self.enable_display()
+
+        self.clear()
+
+        self._display_mode = self.LCD_ENTRYLEFT | self.LCD_ENTRYSHIFTDECREMENT
+        self.command(self.LCD_ENTRYMODESET | self._display_mode)
+
+        self.home()
+
+    def clear(self):
+        self.command(self.LCD_CLEARDISPLAY)
+        sleep(0.002)
+        if self._oled:
+            self.set_cursor(0, 0)
+
+    def home(self) -> None:
+        self.command(self.LCD_RETURNHOME)
+        sleep(0.002)
+
+    def set_cursor(self, column: int, row: int) -> None:
+        row_offsets = [0x00, 0x40, 0x14, 0x54]
+        if row > self._numlines:
+            row = self._numlines - 1
+        self.command(self.LCD_SETDDRAMADDR | (column + row_offsets[row]))
+
+    def disable_display(self) -> None:
+        self._display_control = self._display_control & ~self.LCD_DISPLAYON
+        self.command(self.LCD_DISPLAYON | self._display_control)
+
+    def enable_display(self) -> None:
+        self._display_control = self._display_control | self.LCD_DISPLAYON
+        self.command(self.LCD_DISPLAYCONTROL | self._display_control)
+
+    def disable_cursor(self) -> None:
+        self._display_control = self._display_control & ~self.LCD_CURSORON
+        self.command(self.LCD_DISPLAYCONTROL | self._display_control)
+
+    def enable_cursor(self) -> None:
+        self._display_control = self._display_control | self.LCD_CURSORON
+        self.command(self.LCD_DISPLAYCONTROL | self._display_control)
+
+    def disable_blink(self) -> None:
+        self._display_control = self._display_control & ~self.LCD_BLINKON
+        self.command(self.LCD_DISPLAYCONTROL | self._display_control)
+
+    def enable_blink(self) -> None:
+        self._display_control = self._display_control | self.LCD_BLINKON
+        self.command(self.LCD_DISPLAYCONTROL | self._display_control)
+
+    def scroll_display_left(self) -> None:
+        self.command(self.LCD_CURSORSHIFT | self.LCD_DISPLAYMOVE | self.LCD_MOVELEFT)
+
+    def scroll_display_right(self) -> None:
+        self.command(self.LCD_CURSORSHIFT | self.LCD_DISPLAYMOVE | self.LCD_MOVERIGHT)
+
+    def left_to_right(self) -> None:
+        self._display_mode = self._display_mode | self.LCD_ENTRYLEFT
+        self.command(self.LCD_ENTRYMODESET | self._display_mode)
+
+    def right_to_left(self) -> None:
+        self._display_mode = self._display_mode & ~self.LCD_ENTRYLEFT
+        self.command(self.LCD_ENTRYMODESET | self._display_mode)
+
+    def enable_auto_scroll(self) -> None:
+        self._display_mode = self._display_mode | self.LCD_ENTRYSHIFTINCREMENT
+        self.command(self.LCD_ENTRYMODESET | self._display_mode)
+
+    def disable_auto_scroll(self) -> None:
+        self._display_mode = self._display_mode & ~self.LCD_ENTRYSHIFTINCREMENT
+        self.command(self.LCD_ENTRYMODESET | self._display_mode)
+
+    def disable_backlight(self) -> None:
+        self._backlight_value = self.LCD_NOBACKLIGHT
+        self.expander_write(0)
+
+    def enable_backlight(self) -> None:
+        self._backlight_value = self.LCD_BACKLIGHT
+        self.expander_write(0)
+
+    def command(self, value) -> None:
+        self.send(value, 0)
+
+    def send(self, value: int, mode: int) -> None:
+        high_nibble: int = value & 0xf0
+        low_nibble: int = (value << 4) & 0xf0
+        self.write_4_bits(high_nibble | mode)
+        self.write_4_bits(low_nibble | mode)
+
+    def write_4_bits(self, value: int) -> None:
+        self.expander_write(value)
+        self.pulse_enable(value)
+
+    def expander_write(self, data: int) -> None:
+        self.board.i2c_write(self.address, [data, self._backlight_value])
+
+    def pulse_enable(self, data: int) -> None:
+        self.expander_write(data | self.ENABLE_BIT)
+        sleep(0.000001)
+
+        self.expander_write(data & ~self.ENABLE_BIT)
+        sleep(0.00005)
+
+    def print(self, string: AnyStr) -> None:
+        for character in string:
+            self.write(ord(character))
+            sleep(0.000001)
+        else:
+            sleep(0.00005)
+
+
+Board = pymata4.Pymata4("/dev/ttyACM0")
+LCD = LiquidCrystal_I2C(0x27, 0, 1, Board)
+LCD.enable_backlight()
+LCD.print("Hello, Worlds!")