Implement random.h API for the CC13xx/CC26xx

cpu/cc26xx-cc13xx/random.c

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+/*
+ * Copyright (c) 2016, University of Bristol - http://www.bristol.ac.uk
+ * 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 copyright holder 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT HOLDER 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 cc26xx-trng
+ * @{
+ *
+ * \file
+ *
+ * This file overrides core/lib/random.c and calls SoC-specific RNG functions
+ */
+/*---------------------------------------------------------------------------*/
+#include "contiki.h"
+#include "dev/soc-trng.h"
+/*---------------------------------------------------------------------------*/
+/**
+ * \brief      Generates a new random number using the hardware TRNG.
+ * \return     The random number.
+ */
+unsigned short
+random_rand(void)
+{
+  return (unsigned short)soc_trng_rand_synchronous() & 0xFFFF;
+}
+/*---------------------------------------------------------------------------*/
+/**
+ * \brief Function required by the API
+ * \param seed Ignored.
+ */
+void
+random_init(unsigned short seed)
+{
+  soc_trng_init();
+}
+/*---------------------------------------------------------------------------*/
+/**
+ * @}
+ */