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digistump-sam/system/libsam/source/trng.c

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+/**
+ * \file
+ *
+ * \brief TRNG driver for SAM.
+ *
+ * Copyright (c) 2011-2012 Atmel Corporation. All rights reserved.
+ *
+ * \asf_license_start
+ *
+ * \page License
+ *
+ * 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. The name of Atmel may not be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * 4. This software may only be redistributed and used in connection with an
+ *    Atmel microcontroller product.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
+ *
+ * \asf_license_stop
+ *
+ */
+
+/**
+ * \defgroup group_sam_drivers_trng TRNG - True Random Number Generator
+ *
+ * Driver for the TRNG (True Random Number Generator). This driver provides access
+ * to the main features of the TRNG controller.
+ *
+ * \{
+ */
+
+#include "../chip.h"
+
+/// @cond 0
+/**INDENT-OFF**/
+#ifdef __cplusplus
+extern "C" {
+#endif
+/**INDENT-ON**/
+/// @endcond
+
+#if SAM3XA_SERIES
+
+/* TRNG Security Key Value */
+#define TRNG_KEY  0x524E47
+
+/**
+ * \brief Enable TRNG.
+ *
+ * \param p_trng  Pointer to a TRNG instance.
+ *
+ */
+void trng_enable(Trng *p_trng)
+{
+	p_trng->TRNG_CR = TRNG_CR_ENABLE | TRNG_CR_KEY(TRNG_KEY);
+}
+
+/**
+ * \brief Disable TRNG.
+ *
+ * \param p_trng  Pointer to a TRNG instance.
+ *
+ */
+void trng_disable(Trng *p_trng)
+{
+	p_trng->TRNG_CR = TRNG_CR_KEY(TRNG_KEY);
+}
+
+/**
+ * \brief Enable TRNG interrupt.
+ *
+ * \param p_trng  Pointer to a TRNG instance.
+ *
+ */
+void trng_enable_interrupt(Trng *p_trng)
+{
+	p_trng->TRNG_IER = TRNG_IER_DATRDY;
+}
+
+/**
+ * \brief Disable TRNG interrupt.
+ *
+ * \param p_trng  Pointer to a TRNG instance.
+ *
+ */
+void trng_disable_interrupt(Trng *p_trng)
+{
+	p_trng->TRNG_IDR = TRNG_IER_DATRDY;
+}
+
+/**
+ * \brief Get TRNG interrupt mask.
+ *
+ * \param p_trng  Pointer to a TRNG instance.
+ *
+ * \retval The interrupt mask value.
+ */
+uint32_t trng_get_interrupt_mask(Trng *p_trng)
+{
+	return p_trng->TRNG_IMR;
+}
+
+/**
+ * \brief Get TRNG interrupt status.
+ *
+ * \param p_trng  Pointer to a TRNG instance.
+ *
+ * \retval The interrupt status value.
+ */
+uint32_t trng_get_interrupt_status(Trng *p_trng)
+{
+	return p_trng->TRNG_ISR;
+}
+
+/**
+ * \brief Read TRNG output data.
+ *
+ * \param p_trng  Pointer to a TRNG instance.
+ *
+ * \retval The output data value.
+ */
+uint32_t trng_read_output_data(Trng *p_trng)
+{
+	return p_trng->TRNG_ODATA;
+}
+
+#endif // SAM3XA_SERIES
+
+/// @cond 0
+/**INDENT-OFF**/
+#ifdef __cplusplus
+}
+#endif
+/**INDENT-ON**/
+/// @endcond
+
+/**
+ * \}
+ */