Add BeagleBone AI Support

[Adafruit_Blinka-hackapet.git] / src / adafruit_blinka / microcontroller / mcp2221 / mcp2221.py

diff --git a/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py b/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py
index 66d406dd902247aa1769cd76cdf4893191f906f1..0e061e62380d888880ab2a79624c4ec903bfce08 100644 (file)
--- a/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py
+++ b/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py
@@ -6,7 +6,7 @@ import hid
 
 # Here if you need it
 MCP2221_HID_DELAY = float(os.environ.get("BLINKA_MCP2221_HID_DELAY", 0))
 
 # Here if you need it
 MCP2221_HID_DELAY = float(os.environ.get("BLINKA_MCP2221_HID_DELAY", 0))

-# Use to set delay between reset and device reopen
+# Use to set delay between reset and device reopen. if negative, don't reset at all

 MCP2221_RESET_DELAY = float(os.environ.get("BLINKA_MCP2221_RESET_DELAY", 0.5))
 
 # from the C driver
 MCP2221_RESET_DELAY = float(os.environ.get("BLINKA_MCP2221_RESET_DELAY", 0.5))
 
 # from the C driver


@@ -51,7 +51,8 @@ class MCP2221:
     def __init__(self):
         self._hid = hid.device()
         self._hid.open(MCP2221.VID, MCP2221.PID)
     def __init__(self):
         self._hid = hid.device()
         self._hid.open(MCP2221.VID, MCP2221.PID)

-        self._reset()
+        if MCP2221_RESET_DELAY >= 0:
+            self._reset()

         self._gp_config = [0x07] * 4  # "don't care" initial value
         for pin in range(4):
             self.gp_set_mode(pin, self.GP_GPIO)  # set to GPIO mode
         self._gp_config = [0x07] * 4  # "don't care" initial value
         for pin in range(4):
             self.gp_set_mode(pin, self.GP_GPIO)  # set to GPIO mode


@@ -284,6 +285,8 @@ class MCP2221:
                     continue
                 if resp[2] in (RESP_READ_COMPL, RESP_READ_PARTIAL):
                     break
                     continue
                 if resp[2] in (RESP_READ_COMPL, RESP_READ_PARTIAL):
                     break

+            else:
+                raise RuntimeError("I2C read error: max retries reached.")

 
             # move data into buffer
             chunk = min(end - start, 60)
 
             # move data into buffer
             chunk = min(end - start, 60)


@@ -293,7 +296,7 @@ class MCP2221:
 
     # pylint: enable=too-many-arguments
 
 
     # pylint: enable=too-many-arguments
 

-    def i2c_configure(self, baudrate=100000):
+    def _i2c_configure(self, baudrate=100000):

         """Configure I2C"""
         self._hid_xfer(
             bytes(
         """Configure I2C"""
         self._hid_xfer(
             bytes(