diff --git a/adafruit_sharpmemorydisplay.py b/adafruit_sharpmemorydisplay.py
index 526095c..d73eb7e 100644
--- a/adafruit_sharpmemorydisplay.py
+++ b/adafruit_sharpmemorydisplay.py
@@ -27,6 +27,17 @@
"""
# pylint: enable=line-too-long
+from __future__ import annotations
+
+
+try:
+ # pylint: disable=unused-import
+ import typing
+ from busio import SPI
+ from digitalio import DigitalInOut
+ from circuitpython_typing.pil import Image
+except ImportError:
+ pass
import adafruit_framebuf
from adafruit_bus_device.spi_device import SPIDevice
@@ -45,7 +56,7 @@
_SHARPMEM_BIT_CLEAR = const(0x20) # in lsb
-def reverse_bit(num):
+def reverse_bit(num: int) -> int:
"""Turn an LSB byte to an MSB byte, and vice versa. Used for SPI as
it is LSB for the SHARP, but 99% of SPI implementations are MSB only!"""
result = 0
@@ -62,7 +73,15 @@ class SharpMemoryDisplay(adafruit_framebuf.FrameBuffer):
# pylint: disable=too-many-instance-attributes,abstract-method
- def __init__(self, spi, scs_pin, width, height, *, baudrate=2000000):
+ def __init__(
+ self,
+ spi: SPI,
+ scs_pin: DigitalInOut,
+ width: int,
+ height: int,
+ *,
+ baudrate=2000000,
+ ):
scs_pin.switch_to_output(value=True)
self.spi_device = SPIDevice(
spi, scs_pin, cs_active_value=True, baudrate=baudrate
@@ -78,7 +97,7 @@ def __init__(self, spi, scs_pin, width, height, *, baudrate=2000000):
# Set the vcom bit to a defined state
self._vcom = True
- def show(self):
+ def show(self) -> None:
"""write out the frame buffer via SPI, we use MSB SPI only so some
bit-swapping is required.
"""
@@ -105,7 +124,7 @@ def show(self):
image_buffer.extend(self._buf)
spi.write(image_buffer)
- def image(self, img):
+ def image(self, img: Image) -> None:
"""Set buffer to value of Python Imaging Library image. The image should
be in 1 bit mode and a size equal to the display size."""
# determine our effective width/height, taking rotation into account
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