Adding keypad support and example

adafruit_character_lcd/character_lcd_rgb_i2c.py

@@ -34,10 +34,13 @@
 
 "* `RGB LCD Shield Kit w/ 16x2 Character Display - Negative Display
 <https://www.adafruit.com/product/714>`_"
+
 "* `RGB LCD Shield Kit w/ 16x2 Character Display - Positive Display
 <https://www.adafruit.com/product/716>`_"
+
 "* `Adafruit RGB Negative 16x2 LCD+Keypad Kit for Raspberry Pi
 <https://www.adafruit.com/product/1110>`_"
+
 "* `Adafruit RGB Positive 16x2 LCD+Keypad Kit for Raspberry Pi
 <https://www.adafruit.com/product/1109>`_"
 
@@ -50,6 +53,7 @@
 
 """
 
+import digitalio
 from adafruit_character_lcd.character_lcd import Character_LCD_RGB
 
 __version__ = "0.0.0-auto.0"
@@ -91,5 +95,127 @@ def __init__(self, i2c, columns, lines):
         red = self._mcp.get_pin(6)
         green = self._mcp.get_pin(7)
         blue = self._mcp.get_pin(8)
+        self._left_button = self._mcp.get_pin(4)
+        self._up_button = self._mcp.get_pin(3)
+        self._down_button = self._mcp.get_pin(2)
+        self._right_button = self._mcp.get_pin(1)
+        self._select_button = self._mcp.get_pin(0)
+
+        self._buttons = [self._left_button, self._up_button, self._down_button, self._right_button,
+                         self._select_button]
+
+        for pin in self._buttons:
+            pin.switch_to_input(pull=digitalio.Pull.UP)
+
         super().__init__(reset, enable, db4, db5, db6, db7, columns, lines, red, green, blue,
                          read_write)
+
+    @property
+    def left_button(self):
+        """The left button on the RGB Character LCD I2C Shield or Pi plate.
+
+        The following example prints "Left!" to the LCD when the left button is pressed:
+
+        .. code-block:: python
+
+            import board
+            import busio
+            from adafruit_character_lcd.character_lcd_rgb_i2c import Character_LCD_RGB_I2C
+
+            i2c = busio.I2C(board.SCL, board.SDA)
+            lcd = Character_LCD_RGB_I2C(i2c, 16, 2)
+
+            while True:
+                if lcd.left_button:
+                    lcd.message = "Left!"
+
+        """
+        return not self._left_button.value
+
+    @property
+    def up_button(self):
+        """The up button on the RGB Character LCD I2C Shield or Pi plate.
+
+        The following example prints "Up!" to the LCD when the up button is pressed:
+
+        .. code-block:: python
+
+            import board
+            import busio
+            from adafruit_character_lcd.character_lcd_rgb_i2c import Character_LCD_RGB_I2C
+
+            i2c = busio.I2C(board.SCL, board.SDA)
+            lcd = Character_LCD_RGB_I2C(i2c, 16, 2)
+
+            while True:
+                if lcd.up_button:
+                    lcd.message = "Up!"
+
+        """
+        return not self._up_button.value
+
+    @property
+    def down_button(self):
+        """The down button on the RGB Character LCD I2C Shield or Pi plate.
+
+        The following example prints "Down!" to the LCD when the down button is pressed:
+
+        .. code-block:: python
+
+            import board
+            import busio
+            from adafruit_character_lcd.character_lcd_rgb_i2c import Character_LCD_RGB_I2C
+
+            i2c = busio.I2C(board.SCL, board.SDA)
+            lcd = Character_LCD_RGB_I2C(i2c, 16, 2)
+
+            while True:
+                if lcd.down_button:
+                    lcd.message = "Down!"
+
+        """
+        return not self._down_button.value
+
+    @property
+    def right_button(self):
+        """The right button on the RGB Character LCD I2C Shield or Pi plate.
+
+        The following example prints "Right!" to the LCD when the right button is pressed:
+
+        .. code-block:: python
+
+            import board
+            import busio
+            from adafruit_character_lcd.character_lcd_rgb_i2c import Character_LCD_RGB_I2C
+
+            i2c = busio.I2C(board.SCL, board.SDA)
+            lcd = Character_LCD_RGB_I2C(i2c, 16, 2)
+
+            while True:
+                if lcd.right_button:
+                    lcd.message = "Right!"
+
+        """
+        return not self._right_button.value
+
+    @property
+    def select_button(self):
+        """The select button on the RGB Character LCD I2C Shield or Pi plate.
+
+        The following example prints "Select!" to the LCD when the select button is pressed:
+
+        .. code-block:: python
+
+            import board
+            import busio
+            from adafruit_character_lcd.character_lcd_rgb_i2c import Character_LCD_RGB_I2C
+
+            i2c = busio.I2C(board.SCL, board.SDA)
+            lcd = Character_LCD_RGB_I2C(i2c, 16, 2)
+
+            while True:
+                if lcd.select_button:
+                    lcd.message = "Select!"
+
+        """
+        return not self._select_button.value

docs/examples.rst

@@ -18,3 +18,7 @@ Ensure your device works with this simple test.
 .. literalinclude:: ../examples/charlcd_spi_mono_simpletest.py
     :caption: examples/charlcd_spi_mono_simpletest.py
     :linenos:
+
+.. literalinclude:: ../examples/charlcd_keypad_simpletest.py
+    :caption: examples/charlcd_keypad_simpletest.py
+    :linenos:

examples/charlcd_keypad_simpletest.py

@@ -0,0 +1,42 @@
+"""Simple test for keypad on I2C RGB character LCD Shield or Pi Plate kits"""
+import time
+import board
+import busio
+import adafruit_character_lcd.character_lcd_rgb_i2c as character_lcd
+
+# Modify this if you have a different sized Character LCD
+lcd_columns = 16
+lcd_rows = 2
+
+# Initialise I2C bus.
+i2c = busio.I2C(board.SCL, board.SDA)
+
+# Initialise the LCD class
+lcd = character_lcd.Character_LCD_RGB_I2C(i2c, lcd_columns, lcd_rows)
+
+lcd.clear()
+lcd.color = [100, 0, 0]
+while True:
+    if lcd.left_button:
+        print("Left!")
+        lcd.message = "Left!"
+
+    elif lcd.up_button:
+        print("Up!")
+        lcd.message = "Up!"
+
+    elif lcd.down_button:
+        print("Down!")
+        lcd.message = "Down!"
+
+    elif lcd.right_button:
+        print("Right!")
+        lcd.message = "Right!"
+
+    elif lcd.select_button:
+        print("Select!")
+        lcd.message = "Select!"
+
+    else:
+        time.sleep(0.1)
+        lcd.clear()