boards/common/nrf51: add common clock configuration

boards/common/nrf51/include/cfg_clock_16_0.h

+/*
+ * Copyright (C) 2018 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     boards_common_nrf51
+ * @{
+ *
+ * @file
+ * @brief       Common clock configuration for some nrf51 based boards
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ */
+
+#ifndef CFG_CLOCK_16_0_H
+#define CFG_CLOCK_16_0_H
+
+#include "periph_cpu.h"
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/**
+ * @name    Clock configuration
+ *
+ * @note    The radio will not work with the internal RC oscillator!
+ *
+ * @{
+ */
+#define CLOCK_HFCLK         (16U)           /* set to  0: internal RC oscillator
+                                                      16: 16MHz crystal
+                                                      32: 32MHz crystal */
+#define CLOCK_LFCLK         (0)             /* set to  0: internal RC oscillator
+                                             *         1: 32.768 kHz crystal
+                                             *         2: derived from HFCLK */
+/** @} */
+
+#ifdef __cplusplus
+} /* end extern "C" */
+#endif
+
+#endif /* CFG_CLOCK_16_0_H */

boards/common/nrf51/include/cfg_clock_16_1.h

+/*
+ * Copyright (C) 2018 Inria
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     boards_common_nrf51
+ * @{
+ *
+ * @file
+ * @brief       Common clock configuration for some nrf51 based boards
+ *
+ * @author      Alexandre Abadie <alexandre.abadie@inria.fr>
+ */
+
+#ifndef CFG_CLOCK_16_1_H
+#define CFG_CLOCK_16_1_H
+
+#include "periph_cpu.h"
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/**
+ * @name    Clock configuration
+ *
+ * @note    The radio will not work with the internal RC oscillator!
+ *
+ * @{
+ */
+#define CLOCK_HFCLK         (16U)           /* set to  0: internal RC oscillator
+                                                      16: 16MHz crystal
+                                                      32: 32MHz crystal */
+#define CLOCK_LFCLK         (1)             /* set to  0: internal RC oscillator
+                                             *         1: 32.768 kHz crystal
+                                             *         2: derived from HFCLK */
+/** @} */
+
+#ifdef __cplusplus
+} /* end extern "C" */
+#endif
+
+#endif /* CFG_CLOCK_16_1_H */