X-Git-Url: https://git.ayoreis.com/Adafruit_Blinka-hackapet.git/blobdiff_plain/0bc5711e69ff03db0a46adc2ffa1ee2819b0b1ef..d3636d7313d5a05b6f321ad09d53f92d3d47fee0:/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 0275e66..e5b24bb 100644
--- a/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py
+++ b/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py
@@ -198,7 +198,7 @@ class MCP2221:
         length = end - start
         retries = 0
 
-        while (end - start) > 0:
+        while (end - start) > 0 or not buffer:
             chunk = min(end - start, MCP2221_MAX_I2C_DATA_LEN)
             # write out current chunk
             resp = self._hid_xfer(
@@ -223,6 +223,8 @@ class MCP2221:
             # yay chunk sent!
             while self._i2c_state() == RESP_I2C_PARTIALDATA:
                 time.sleep(0.001)
+            if not buffer:
+                break
             start += chunk
             retries = 0
 
@@ -285,6 +287,8 @@ class MCP2221:
                     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)
@@ -294,7 +298,7 @@ class MCP2221:
 
     # pylint: enable=too-many-arguments
 
-    def i2c_configure(self, baudrate=100000):
+    def _i2c_configure(self, baudrate=100000):
         """Configure I2C"""
         self._hid_xfer(
             bytes(
@@ -325,7 +329,7 @@ class MCP2221:
         out_start=0,
         out_end=None,
         in_start=0,
-        in_end=None
+        in_end=None,
     ):
         """Write data from buffer_out to an address and then
         read data from an address and into buffer_in