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/*
ChibiOS - Copyright (C) 2006..2018 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file hal_trng.c
* @brief TRNG Driver code.
*
* @addtogroup TRNG
* @{
*/
#include "hal.h"
#if (HAL_USE_TRNG == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief TRNG Driver initialization.
* @note This function is implicitly invoked by @p halInit(), there is
* no need to explicitly initialize the driver.
*
* @init
*/
void trngInit(void) {
trng_lld_init();
}
/**
* @brief Initializes the standard part of a @p TRNGDriver structure.
*
* @param[out] trngp pointer to the @p TRNGDriver object
*
* @init
*/
void trngObjectInit(TRNGDriver *trngp) {
trngp->state = TRNG_STOP;
trngp->config = NULL;
}
/**
* @brief Configures and activates the TRNG peripheral.
*
* @param[in] trngp pointer to the @p TRNGDriver object
* @param[in] config pointer to the @p TRNGConfig object or @p NULL for
* default configuration
*
* @api
*/
void trngStart(TRNGDriver *trngp, const TRNGConfig *config) {
osalDbgCheck(trngp != NULL);
osalSysLock();
osalDbgAssert((trngp->state == TRNG_STOP) || (trngp->state == TRNG_READY),
"invalid state");
trngp->config = config;
trng_lld_start(trngp);
trngp->state = TRNG_READY;
osalSysUnlock();
}
/**
* @brief Deactivates the TRNG peripheral.
*
* @param[in] trngp pointer to the @p TRNGDriver object
*
* @api
*/
void trngStop(TRNGDriver *trngp) {
osalDbgCheck(trngp != NULL);
osalSysLock();
osalDbgAssert((trngp->state == TRNG_STOP) || (trngp->state == TRNG_READY),
"invalid state");
trng_lld_stop(trngp);
trngp->config = NULL;
trngp->state = TRNG_STOP;
osalSysUnlock();
}
/**
* @brief True random numbers generator.
* @note The function is blocking and likely performs polled waiting
* inside the low level implementation.
*
* @param[in] trngp pointer to the @p TRNGDriver object
* @param[in] size size of output buffer
* @param[out] out output buffer
* @return The operation status.
* @retval false if a random number has been generated.
* @retval true if an HW error occurred.
*
* @api
*/
bool trngGenerate(TRNGDriver *trngp, size_t size, uint8_t *out) {
bool err;
osalDbgCheck((trngp != NULL) && (out != NULL));
osalDbgAssert(trngp->state == TRNG_READY, "not ready");
trngp->state = TRNG_RUNNING;
err = trng_lld_generate(trngp, size, out);
trngp->state = TRNG_READY;
return err;
}
#endif /* HAL_USE_TRNG == TRUE */
/** @} */
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