set xtimer parameters for cc2538-based boards.

boards/cc2538dk/include/board.h

@@ -72,6 +72,17 @@ extern "C" {
 #define CCA_BACKDOOR_ACTIVE_LEVEL 0 /**< Active low */
 /** @} */
 
+/**
+ * @name xtimer configuration
+ * @{
+ */
+#define XTIMER              TIMER_0
+#define XTIMER_CHAN         0
+#define XTIMER_SHIFT        -4
+#define XTIMER_BACKOFF      50
+#define XTIMER_ISR_BACKOFF  40
+/** @} */
+
 /**
  * @brief Initialize board specific hardware, including clock, LEDs and std-IO
  */

boards/openmote-cc2538/include/board.h

@@ -60,6 +60,17 @@
 #define LED_ORANGE_TOGGLE   (LED_PORT->DATA ^= (1 << LED_ORANGE_PIN))
 /** @} */
 
+/**
+ * @name xtimer configuration
+ * @{
+ */
+#define XTIMER              TIMER_0
+#define XTIMER_CHAN         0
+#define XTIMER_SHIFT        -4
+#define XTIMER_BACKOFF      50
+#define XTIMER_ISR_BACKOFF  40
+/** @} */
+
 /**
  * @brief Initialize board specific hardware, including clock, LEDs and std-IO
  */

boards/remote/include/board.h

@@ -121,6 +121,18 @@
 #define RF_SWITCH_INTERNAL  (RF_SWITCH_PORT->DATA &= ~(1 << RF_SWITCH_PIN))
 #define RF_SWITCH_TOGGLE    (RF_SWITCH_PORT->DATA ^= (1 << RF_SWITCH_PIN))
 /** @} */
+
+/**
+ * @name xtimer configuration
+ * @{
+ */
+#define XTIMER              TIMER_0
+#define XTIMER_CHAN         0
+#define XTIMER_SHIFT        -4
+#define XTIMER_BACKOFF      50
+#define XTIMER_ISR_BACKOFF  40
+/** @} */
+
 /**
  * @brief Initialize board specific hardware, including clock, LEDs and std-IO
  */