Define CLOCK_SOURCE and move the clock defines to appropriate files.

boards/ek-lm4f120xl/include/periph_conf.h

@@ -23,6 +23,19 @@
 extern "C" {
 #endif
 
+/**
+ * @name Define the nominal CPU core clock in this board
+ * @{
+ */
+#define F_CPU                           1000000
+#define CLK80                           1
+#define CLK50                           2
+#define CLK40                           3
+#define CLK16                           4
+#define CLK1                            5
+#define CLOCK_SOURCE					CLK40
+/** @} */
+
 /**
  * @name Timer configuration
  * @{

cpu/lm4f120/cpu.c

@@ -34,7 +34,7 @@ void cpu_init(void)
     cortexm_init();
 
     /* initialize the clock system */
-    cpu_clock_init(CLK40);
+    cpu_clock_init(CLOCK_SOURCE);
 }
 
 void setup_fpu(void)

cpu/lm4f120/include/cpu_conf.h

@@ -74,18 +74,6 @@ extern "C" {
 #endif
 /** @} */
 
-/**
- * @name Define the nominal CPU core clock in this board
- * @{
- */
-#define F_CPU                           1000000
-#define CLK80                           1
-#define CLK50                           2
-#define CLK40                           3
-#define CLK16                           4
-#define CLK1                            5
-/** @} */
-
 /**
  * @name cpu functions
  * @{