From b668b5c9a24b38c980830b710c4a0d1c396268cc Mon Sep 17 00:00:00 2001
From: Carson McDonald <carson@ioncannon.net>
Date: Sun, 18 Oct 2020 09:30:37 -0400
Subject: [PATCH] If the number of retries is exceeded raise an error

---
 src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py b/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py
index 0275e66..e01eb7b 100644
--- a/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py
+++ b/src/adafruit_blinka/microcontroller/mcp2221/mcp2221.py
@@ -285,6 +285,8 @@ 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)
-- 
2.49.0