From: Melissa LeBlanc-Williams <melissa@adafruit.com>
Date: Fri, 4 Jun 2021 21:53:20 +0000 (-0700)
Subject: Merge pull request #483 from lesamouraipourpre/rp2040-i2c
X-Git-Tag: 6.10.1
X-Git-Url: https://git.ayoreis.com/hackapet/Adafruit_Blinka.git/commitdiff_plain/dadec9cca754a65269cf286649b282bc1c0c9252?hp=78bfa5749837c033839d087a5aab7932960ea6f8

Merge pull request #483 from lesamouraipourpre/rp2040-i2c

Fix I2C writeto_then_readfrom when in_start > 0 in RP2040
---

diff --git a/.gitignore b/.gitignore
index 1be1c4b..e7e0f2d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ bundles
 .eggs
 dist
 **/*.egg-info
+.vscode
diff --git a/src/adafruit_blinka/microcontroller/rp2040/i2c.py b/src/adafruit_blinka/microcontroller/rp2040/i2c.py
index 785769d..2a6c6a0 100644
--- a/src/adafruit_blinka/microcontroller/rp2040/i2c.py
+++ b/src/adafruit_blinka/microcontroller/rp2040/i2c.py
@@ -55,9 +55,8 @@ class I2C:
             self.writeto(address, buffer_out[out_start:out_end], stop=stop)
         else:
             self.writeto(address, buffer_out[out_start:], stop=stop)
-        read_buffer = buffer_in
+
+        if not in_end:
+            in_end = len(buffer_in)
+        read_buffer = memoryview(buffer_in)[in_start:in_end]
         self.readfrom_into(address, read_buffer, stop=stop)
-        if in_end:
-            buffer_in[in_start:in_end] = read_buffer[in_start:in_end]
-        else:
-            buffer_in[in_start:] = read_buffer[in_start:]