From 0ebff04ad74d35455c2fb1e8b3d65cabd89f4efa Mon Sep 17 00:00:00 2001
From: hartytp <thomas.harty@physics.ox.ac.uk>
Date: Thu, 7 Feb 2019 15:43:18 +0000
Subject: [PATCH] SUServo: apply bit masks to servo memory writes to prevent
 overflows

Signed-off-by: TPH <thomas.harty@physics.ox.ac.uk>
---
 artiq/coredevice/suservo.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/artiq/coredevice/suservo.py b/artiq/coredevice/suservo.py
index 956950380..f1ce004e5 100644
--- a/artiq/coredevice/suservo.py
+++ b/artiq/coredevice/suservo.py
@@ -130,6 +130,7 @@ class SUServo:
         :param value: Data to be written.
         """
         addr |= WE
+        value &= (1 << COEFF_WIDTH) - 1
         value |= (addr >> 8) << COEFF_WIDTH
         addr = addr & 0xff
         rtio_output((self.channel << 8) | addr, value)