neorv32/sw/lib/include/neorv32_trng.h

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2024-02-24 08:25:27 +00:00
// #################################################################################################
// # << NEORV32: neorv32_trng.h - True Random Number Generator (TRNG) HW Driver >> #
// # ********************************************************************************************* #
// # BSD 3-Clause License #
// # #
// # Copyright (c) 2023, Stephan Nolting. 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 #
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// # COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, #
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// # ********************************************************************************************* #
// # The NEORV32 Processor - https://github.com/stnolting/neorv32 (c) Stephan Nolting #
// #################################################################################################
/**********************************************************************//**
* @file neorv32_trng.h
* @brief True Random Number Generator (TRNG) HW driver header file.
*
* @note These functions should only be used if the TRNG unit was synthesized (IO_TRNG_EN = true).
**************************************************************************/
#ifndef neorv32_trng_h
#define neorv32_trng_h
/**********************************************************************//**
* @name IO Device: True Random Number Generator (TRNG)
**************************************************************************/
/**@{*/
/** TRNG module prototype */
typedef volatile struct __attribute__((packed,aligned(4))) {
uint32_t CTRL; /**< offset 0: control register (#NEORV32_TRNG_CTRL_enum) */
} neorv32_trng_t;
/** TRNG module hardware access (#neorv32_trng_t) */
#define NEORV32_TRNG ((neorv32_trng_t*) (NEORV32_TRNG_BASE))
/** TRNG control/data register bits */
enum NEORV32_TRNG_CTRL_enum {
TRNG_CTRL_DATA_LSB = 0, /**< TRNG data/control register(0) (r/-): Random data byte LSB */
TRNG_CTRL_DATA_MSB = 7, /**< TRNG data/control register(7) (r/-): Random data byte MSB */
TRNG_CTRL_FIFO_LSB = 16, /**< TRNG data/control register(16) (r/-): log2(FIFO size), LSB */
TRNG_CTRL_FIFO_MSB = 19, /**< TRNG data/control register(19) (r/-): log2(FIFO size), MSB */
TRNG_CTRL_IRQ_FIFO_NEMPTY = 25, /**< TRNG data/control register(25) (r/w): IRQ if FIFO is not empty */
TRNG_CTRL_IRQ_FIFO_HALF = 26, /**< TRNG data/control register(26) (r/w): IRQ if FIFO is at least half-full */
TRNG_CTRL_IRQ_FIFO_FULL = 27, /**< TRNG data/control register(27) (r/w): IRQ if FIFO is full */
TRNG_CTRL_FIFO_CLR = 28, /**< TRNG data/control register(28) (-/w): Clear data FIFO (auto clears) */
TRNG_CTRL_SIM_MODE = 29, /**< TRNG data/control register(29) (r/-): PRNG mode (simulation mode) */
TRNG_CTRL_EN = 30, /**< TRNG data/control register(30) (r/w): TRNG enable */
TRNG_CTRL_VALID = 31 /**< TRNG data/control register(31) (r/-): Random data output valid */
};
/**@}*/
/**********************************************************************//**
* @name Prototypes
**************************************************************************/
/**@{*/
int neorv32_trng_available(void);
void neorv32_trng_enable(uint32_t irq_mask);
void neorv32_trng_disable(void);
void neorv32_trng_fifo_clear(void);
int neorv32_trng_get_fifo_depth(void);
int neorv32_trng_get(uint8_t *data);
int neorv32_trng_check_sim_mode(void);
/**@}*/
#endif // neorv32_trng_h