nrf52dk: cpu/nrf52832 support

cpu/nrf52832/dev/random.c

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+/*
+ * Copyright (c) 2015, Nordic Semiconductor
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+/**
+ * \addtogroup nrf52832
+ * @{
+ *
+ * \addtogroup nrf52832-dev Device drivers
+ * @{
+ *
+ * \addtogroup nrf52832-rng Hardware random number generator
+ * @{
+ *
+ * \file
+ *         Random number generator routines exploiting the nRF52 hardware
+ *         capabilities.
+ *
+ *         This file overrides core/lib/random.c.
+ *
+ * \author
+ *         Wojciech Bober <wojciech.bober@nordicsemi.no>
+ */
+#include <stddef.h>
+#include <nrf_drv_rng.h>
+#include "app_error.h"
+/*---------------------------------------------------------------------------*/
+/**
+ * \brief Generates a new random number using the nRF52 RNG.
+ * \return a random number.
+ */
+unsigned short
+random_rand(void)
+{
+  unsigned short value = 42;
+  uint8_t available;
+  ret_code_t err_code;
+
+  do {
+    nrf_drv_rng_bytes_available(&available);
+  } while (available < sizeof(value));
+
+  err_code = nrf_drv_rng_rand((uint8_t *)&value, sizeof(value));
+  APP_ERROR_CHECK(err_code);
+
+  return value;
+}
+/*---------------------------------------------------------------------------*/
+/**
+ * \brief Initialize the nRF52 random number generator.
+ * \param seed Ignored. It's here because the function prototype is in core.
+ *
+ */
+void
+random_init(unsigned short seed)
+{
+  (void)seed;
+  ret_code_t err_code = nrf_drv_rng_init(NULL);
+  APP_ERROR_CHECK(err_code);
+}
+/**
+ * @}
+ * @}
+ * @}
+ */