Initial eink implementation - not complete

[hackapet/Adafruit_Blinka_Displayio.git] / displayio / _fourwire.py

diff --git a/displayio/_fourwire.py b/displayio/_fourwire.py
index 3d5fa7e99ff4f40f1e93f16dc2cfb888761336a1..c343e6511a407cdb39c1abfc5df58097b95da4ea 100644 (file)
--- a/displayio/_fourwire.py
+++ b/displayio/_fourwire.py
@@ -22,7 +22,7 @@ from typing import Optional
 import digitalio
 import busio
 import microcontroller
-import circuitpython_typing
+from circuitpython_typing import ReadableBuffer
 from ._constants import (
     CHIP_SELECT_TOGGLE_EVERY_BYTE,
     CHIP_SELECT_UNTOUCHED,
@@ -30,7 +30,7 @@ from ._constants import (
     DISPLAY_DATA,
 )
 
-__version__ = "0.0.0-auto.0"
+__version__ = "0.0.0+auto.0"
 __repo__ = "https://github.com/adafruit/Adafruit_Blinka_displayio.git"
 
 
@@ -95,7 +95,7 @@ class FourWire:
     def send(
         self,
         command,
-        data: circuitpython_typing.ReadableBuffer,
+        data: ReadableBuffer,
         *,
         toggle_every_byte: bool = False,
     ) -> None:
@@ -112,7 +112,7 @@ class FourWire:
             else CHIP_SELECT_UNTOUCHED
         )
         self._begin_transaction()
-        self._send(DISPLAY_COMMAND, chip_select, command)
+        self._send(DISPLAY_COMMAND, chip_select, bytes([command]))
         self._send(DISPLAY_DATA, chip_select, data)
         self._end_transaction()
 
@@ -120,7 +120,7 @@ class FourWire:
         self,
         data_type: int,
         chip_select: int,
-        data: circuitpython_typing.ReadableBuffer,
+        data: ReadableBuffer,
     ):
         self._dc.value = data_type == DISPLAY_DATA
         if chip_select == CHIP_SELECT_TOGGLE_EVERY_BYTE:
@@ -132,16 +132,17 @@ class FourWire:
         else:
             self._spi.write(data)
 
-    def _begin_transaction(self):
+    def _begin_transaction(self) -> bool:
         """Begin the SPI transaction by locking, configuring, and setting Chip Select"""
-        while not self._spi.try_lock():
-            pass
+        if not self._spi.try_lock():
+            return False
         self._spi.configure(
             baudrate=self._frequency, polarity=self._polarity, phase=self._phase
         )
         self._chip_select.value = False
+        return True
 
-    def _end_transaction(self):
+    def _end_transaction(self) -> None:
         """End the SPI transaction by unlocking and setting Chip Select"""
         self._chip_select.value = True
         self._spi.unlock()