Added file for 1.8 inch TFT Shield

.gitignore

@@ -1,6 +1,12 @@
+*.mpy
+.idea
 __pycache__
 _build
 *.pyc
 .env
 build*
 bundles
+*.DS_Store
+.eggs
+dist
+**/*.egg-info

adafruit_seesaw/tftshield18.py

@@ -0,0 +1,100 @@
+# The MIT License (MIT)
+#
+# Copyright (c) 2018 Dean Miller for Adafruit Industries
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+# pylint: disable=missing-docstring,invalid-name,too-many-public-methods
+
+from collections import namedtuple
+import board
+from micropython import const
+from adafruit_seesaw.seesaw import Seesaw
+
+__version__ = "0.0.0-auto.0"
+__repo__ = "https://github.com/adafruit/Adafruit_CircuitPython_seesaw.git"
+
+_TIMER_BASE = const(0x08)
+_TIMER_PWM = const(0x01)
+_TIMER_FREQ = const(0x02)
+
+_TFTSHIELD_RESET_PIN = const(3)
+
+_BUTTON_UP = const(5)
+_BUTTON_DOWN = const(8)
+_BUTTON_LEFT = const(6)
+_BUTTON_RIGHT = const(9)
+_BUTTON_SELECT = const(7)
+_BUTTON_A = const(10)
+_BUTTON_B = const(11)
+_BUTTON_C = const(14)
+
+Buttons = namedtuple("Buttons", "right down left up select a b c")
+
+class TFTShield18(Seesaw):
+
+    _BACKLIGHT_ON = b"\xFF\xFF"
+    _BACKLIGHT_OFF = b"\x00\x00"
+
+    _button_mask = ((1 << _BUTTON_RIGHT) |
+                    (1 << _BUTTON_DOWN) |
+                    (1 << _BUTTON_LEFT) |
+                    (1 << _BUTTON_UP) |
+                    (1 << _BUTTON_SELECT) |
+                    (1 << _BUTTON_A) |
+                    (1 << _BUTTON_B) |
+                    (1 << _BUTTON_C))
+
+    def __init__(self, i2c_bus=board.I2C(), addr=0x2E):
+        super(TFTShield18, self).__init__(i2c_bus, addr)
+        self.pin_mode(_TFTSHIELD_RESET_PIN, self.OUTPUT)
+        self.pin_mode_bulk(self._button_mask, self.INPUT_PULLUP)
+
+    def set_backlight(self, value):
+        """
+        Set the backlight on
+        """
+        if not isinstance(value, bool):
+            raise ValueError("Value must be of boolean type")
+        command = self._BACKLIGHT_ON if value else self._BACKLIGHT_OFF
+        self.write(_TIMER_BASE, _TIMER_PWM, b"\x00" + command)
+
+    def set_backlight_freq(self, freq):
+        """
+        Set the backlight frequency of the TFT Display
+        """
+        if not isinstance(freq, int):
+            raise ValueError("Value must be of integer type")
+        value = b"\x00" + bytearray((freq >> 8) & 0xFF, freq & 0xFF)
+        self.write(_TIMER_BASE, _TIMER_FREQ, value)
+
+    def tft_reset(self, rst=True):
+        """
+        Reset the TFT Display
+        """
+        self.digital_write(_TFTSHIELD_RESET_PIN, rst)
+
+    @property
+    def buttons(self):
+        """
+        Return a set of buttons with current push values
+        """
+        button_values = self.digital_read_bulk(self._button_mask)
+        return Buttons(*[not button_values & (1 << button) for button in
+                         (_BUTTON_RIGHT, _BUTTON_DOWN, _BUTTON_LEFT, _BUTTON_UP,
+                          _BUTTON_SELECT, _BUTTON_A, _BUTTON_B, _BUTTON_C)])