X-Git-Url: https://git.ayoreis.com/Adafruit_Blinka-hackapet.git/blobdiff_plain/2ac9e76bea9e29fcda185b73ff374d84b8439858..4ce7761a8b73ddc453ec6f64b35e73b33e43a3a2:/src/busio.py

diff --git a/src/busio.py b/src/busio.py
index 2de9e60..08761c4 100644
--- a/src/busio.py
+++ b/src/busio.py
@@ -9,7 +9,7 @@ See `CircuitPython:busio` in CircuitPython for more details.
 
 * Author(s): cefn
 """
-
+import os
 try:
     import threading
 except ImportError:
@@ -29,6 +29,8 @@ class I2C(Lockable):
     """
     Busio I2C Class for CircuitPython Compatibility. Used
     for both MicroPython and Linux.
+
+    NOTE: Frequency has no effect on Linux systems. The argument is only there for compatibility.
     """
 
     def __init__(self, scl, sda, frequency=100000):
@@ -52,6 +54,13 @@ class I2C(Lockable):
 
             self._i2c = _I2C(frequency=frequency)
             return
+
+        if "BLINKA_FORCECHIP" in os.environ and os.environ["BLINKA_FORCEBOARD"] == "GENERIC_AGNOSTIC_BOARD":
+            from adafruit_blinka.microcontroller.generic_agnostic_board.i2c import I2C as _I2C
+
+            self._i2c = _I2C(frequency=frequency)
+            return
+
         if detector.board.greatfet_one:
             from adafruit_blinka.microcontroller.nxp_lpc4330.i2c import I2C as _I2C
 
@@ -136,6 +145,9 @@ class I2C(Lockable):
 
         if detector.board.any_embedded_linux:
             from adafruit_blinka.microcontroller.generic_linux.i2c import I2C as _I2C
+
+            if frequency == 100000:
+                frequency = None  # Set to None if default to avoid triggering warning
         elif detector.board.ftdi_ft2232h:
             from adafruit_blinka.microcontroller.ftdi_mpsse.mpsse.i2c import I2C as _I2C
         else:
@@ -189,18 +201,17 @@ 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,