X-Git-Url: https://git.ayoreis.com/hackapet/Adafruit_Blinka_Displayio.git/blobdiff_plain/33accffa7278997a55e237473c33880813def934..ccf2ba325ec856e092637d645b4b9ae499d12f45:/displayio/_fourwire.py?ds=sidebyside

diff --git a/displayio/_fourwire.py b/displayio/_fourwire.py
index 142e308..61be810 100644
--- a/displayio/_fourwire.py
+++ b/displayio/_fourwire.py
@@ -132,16 +132,24 @@ class FourWire:
         else:
             self._spi.write(data)
 
-    def _begin_transaction(self):
+    def _free(self) -> bool:
+        """Attempt to free the bus and return False if busy"""
+        if not self._spi.try_lock():
+            return False
+        self._spi.unlock()
+        return True
+
+    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()