From df232f54057338ab237e64085060d4d65efdb645 Mon Sep 17 00:00:00 2001
From: Yann Sionneau <ys@m-labs.hk>
Date: Tue, 7 Jul 2015 15:18:28 +0200
Subject: [PATCH] lda driver: add error message when no device found

---
 artiq/devices/lda/driver.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/artiq/devices/lda/driver.py b/artiq/devices/lda/driver.py
index c198f04c7..d84605201 100644
--- a/artiq/devices/lda/driver.py
+++ b/artiq/devices/lda/driver.py
@@ -110,7 +110,7 @@ class Lda:
                                          self._product_ids[self.product],
                                          self.serial)
         if not self._dev:
-            raise IOError
+            raise IOError("Device not found")
 
     def close(self):
         """Close the device."""