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/*
RNG for ChibiOS - Copyright (C) 2016 Stephane D'Alu
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.
*/
#ifndef HAL_RNG_H_
#define HAL_RNG_H_
#if (HAL_USE_RNG == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @name Configuration options
* @{
*/
/**
* @brief Enables the @p rngAcquireBus() and @p rngReleaseBus() APIs.
* @note Disabling this option saves both code and data space.
*/
#if !defined(RNG_USE_MUTUAL_EXCLUSION) || defined(__DOXYGEN__)
#define RNG_USE_MUTUAL_EXCLUSION TRUE
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief Driver state machine possible states.
*/
typedef enum {
RNG_UNINIT, /* Not initialized. */
RNG_STOP, /* Stopped. */
RNG_READY, /* Ready. */
} rngstate_t;
#include "hal_rng_lld.h"
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/**
* @name Low level driver helper macros
* @{
*/
/**
* @brief Wakes up the waiting thread.
*
* @param[in] rngp pointer to the @p RNGDriver object
*
* @notapi
*/
#define _rng_wakeup_isr(rngp) { \
osalSysLockFromISR(); \
osalThreadResumeI(&(rngp)->thread, MSG_OK); \
osalSysUnlockFromISR(); \
}
/**
* @brief Common ISR code.
* @details This code handles the portable part of the ISR code:
* - Callback invocation.
* - Waiting thread wakeup, if any.
* - Driver state transitions.
* .
* @note This macro is meant to be used in the low level drivers
* implementation only.
*
* @param[in] rngp pointer to the @p RNGDriver object
*
* @notapi
*/
#define _rng_isr_code(rngp, rng) { \
if ((rngp)->config->end_cb) { \
(rngp)->state = RNG_COMPLETE; \
(rngp)->config->end_cb(rngp, rng); \
if ((rngp)->state == RNG_COMPLETE) \
(rngp)->state = RNG_READY; \
} \
else \
(rngp)->state = RNG_READY; \
_rng_wakeup_isr(rngp); \
}
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
void rngInit(void);
void rngObjectInit(RNGDriver *rngp);
void rngStart(RNGDriver *rngp, const RNGConfig *config);
void rngStop(RNGDriver *rngp);
msg_t rngWriteI(RNGDriver *rngp, uint8_t *buf, size_t n, systime_t timeout);
msg_t rngWrite(RNGDriver *rngp, uint8_t *buf, size_t n, systime_t timeout);
#if RNG_USE_MUTUAL_EXCLUSION == TRUE
void rngAcquireUnit(RNGDriver *rngp);
void rngReleaseUnit(RNGDriver *rngp);
#endif
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_RNG */
#endif /* HAL_RNG_H_ */
/** @} */
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