X-Git-Url: https://git.ayoreis.com/hackapet/Adafruit_Blinka.git/blobdiff_plain/fe8a29e1b06a1323490ebcd9dbf134076a6a32ee..455fc42423d886c8dbd0f3ff7cc1acae29aafbfd:/src/busio.py

diff --git a/src/busio.py b/src/busio.py
index 9d21996..cdce321 100644
--- a/src/busio.py
+++ b/src/busio.py
@@ -9,6 +9,7 @@ See `CircuitPython:busio` in CircuitPython for more details.
 
 * Author(s): cefn
 """
+import os
 
 try:
     import threading
@@ -50,8 +51,10 @@ class I2C(Lockable):
             self._i2c = _I2C(frequency=frequency)
             return
         if detector.board.microchip_mcp2221:
-            from adafruit_blinka.microcontroller.mcp2221.i2c import I2C as _I2C
-
+            if "BLINKA_FORCEBOARD" not in os.environ:
+                from adafruit_blinka.microcontroller.mcp2221.i2c import I2C as _I2C
+            elif os.environ["BLINKA_FORCEBOARD"] == "MICROCHIP_MCP2221":
+                from adafruit_blinka.microcontroller.fake_mcp2221.i2c import I2C as _I2C
             self._i2c = _I2C(frequency=frequency)
             return
         if detector.board.greatfet_one:
@@ -194,18 +197,17 @@ class I2C(Lockable):
             if end is None:
                 end = len(buffer)
             buffer = memoryview(buffer)[start:end]
-        stop = True  # remove for efficiency later
-        return self._i2c.readfrom_into(address, buffer, stop=stop)
+        return self._i2c.readfrom_into(address, buffer, stop=True)
 
-    def writeto(self, address, buffer, *, start=0, end=None, stop=True):
+    def writeto(self, address, buffer, *, start=0, end=None):
         """Write to a device at specified address from a buffer"""
         if isinstance(buffer, str):
             buffer = bytes([ord(x) for x in buffer])
         if start != 0 or end is not None:
             if end is None:
-                return self._i2c.writeto(address, memoryview(buffer)[start:], stop=stop)
-            return self._i2c.writeto(address, memoryview(buffer)[start:end], stop=stop)
-        return self._i2c.writeto(address, buffer, stop=stop)
+                return self._i2c.writeto(address, memoryview(buffer)[start:], stop=True)
+            return self._i2c.writeto(address, memoryview(buffer)[start:end], stop=True)
+        return self._i2c.writeto(address, buffer, stop=True)
 
     def writeto_then_readfrom(
         self,