From b672a99174493460f3eaa05d48a95b343692d0f0 Mon Sep 17 00:00:00 2001
From: Yann Sionneau <ys@m-labs.hk>
Date: Thu, 26 Feb 2015 12:53:54 +0100
Subject: [PATCH] lda: add support for ping

---
 artiq/devices/lda/driver.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/artiq/devices/lda/driver.py b/artiq/devices/lda/driver.py
index 70c199c20..fdc8763a3 100644
--- a/artiq/devices/lda/driver.py
+++ b/artiq/devices/lda/driver.py
@@ -63,6 +63,9 @@ class Ldasim:
             print("setting attenuation to {}".format(att))
             self._attenuation = att
 
+    def ping(self):
+        return True
+
 
 class Lda:
     """Lab Brick Digital Attenuator driver.
@@ -230,3 +233,10 @@ class Lda:
             raise ValueError("Cannot set attenuation {} < 0".format(att))
         else:
             self.set(0x8d, bytes([int(round(att.amount*4))]))
+
+    def ping(self):
+        try:
+            self.get_attenuation()
+        except:
+            return False
+        return True