coredevice/TCA6424A: convert 'outputs' value to little endian. Closes #…

…437
m-labs · May 22, 2016 · 3d6f551 · 3d6f551
1 parent 852ddb7
commit 3d6f551
Showing 2 changed files with 13 additions and 1 deletion.
diff --git a/RELEASE_NOTES.rst b/RELEASE_NOTES.rst
@@ -42,6 +42,13 @@ unreleased [2.x]
   takes into account the repository revision field.
 
 
+1.1 (unreleased)
+----------------
+
+* TCA6424A.set converts the "outputs" value to little-endian before programming
+  it into the registers.
+
+
 1.0
 ---
 

diff --git a/artiq/coredevice/i2c.py b/artiq/coredevice/i2c.py
@@ -108,5 +108,10 @@ def set(self, outputs):
 
         A bit set to 1 means the TTL is an output.
         """
+        outputs_le = (
+            ((outputs & 0xff0000) >> 16) |
+            (outputs & 0x00ff00) |
+            (outputs & 0x0000ff) << 16)
+
         self._write24(0x8c, 0)  # set all directions to output
-        self._write24(0x84, outputs)  # set levels
+        self._write24(0x84, outputs_le)  # set levels