From c78fbe92eeeb994e147c9ae930367b1dc189b9b1 Mon Sep 17 00:00:00 2001
From: Hauke Petersen <hauke.petersen@fu-berlin.de>
Date: Tue, 3 Nov 2015 15:27:25 +0100
Subject: [PATCH] tests/driver_tcs37727: simplified Makefile

---
 tests/driver_tcs37727/Makefile | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/tests/driver_tcs37727/Makefile b/tests/driver_tcs37727/Makefile
index 103ef8bba3..f5254514aa 100644
--- a/tests/driver_tcs37727/Makefile
+++ b/tests/driver_tcs37727/Makefile
@@ -6,17 +6,12 @@ FEATURES_REQUIRED = periph_i2c
 USEMODULE += tcs37727
 USEMODULE += xtimer
 
-ifneq (,$(TEST_TCS37727_I2C))
-  CFLAGS += -DTEST_TCS37727_I2C=$(TEST_TCS37727_I2C)
-else
-  # set random default
-  CFLAGS += -DTEST_TCS37727_I2C=I2C_0
-endif
-ifneq (,$(TEST_TCS37727_ADDR))
-  CFLAGS += -DTEST_TCS37727_ADDR=$(TEST_TCS37727_ADDR)
-else
-  # set random default
-  CFLAGS += -DTEST_TCS37727_ADDR=0x29
-endif
+# set default device parameters in case they are undefined
+TEST_TCS37727_I2C  ?= I2C_0
+TEST_TCS37727_ADDR ?= 0x29
+
+# export parameters
+CFLAGS += -DTEST_TCS37727_I2C=$(TEST_TCS37727_I2C)
+CFLAGS += -DTEST_TCS37727_ADDR=$(TEST_TCS37727_ADDR)
 
 include $(RIOTBASE)/Makefile.include