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/*
ChibiOS - Copyright (C) 2015 Michael D. Spradling
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 _CRC_H_
#define _CRC_H_
#if (HAL_USE_CRC == TRUE) || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @name Configuration options
* @{
*/
/**
* @brief Enable DMA CRC
* @note Enables DMA when doing CRC calculations. This may be less
* efficient with smaller CRC calculations.
*/
#if !defined(CRC_USE_DMA) || defined(__DOXYGEN__)
#define CRC_USE_DMA FALSE
#endif
/**
* @brief Enables the @p crcAcquireBus() and @p crcReleaseBus() APIs.
* @note Disabling this option saves both code and data space.
*/
#if !defined(CRC_USE_MUTUAL_EXCLUSION) || defined(__DOXYGEN__)
#define CRC_USE_MUTUAL_EXCLUSION TRUE
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#if STM32_CRC_USE_CRC1 != TRUE && CRCSW_USE_CRC1 != TRUE
#error "CRC requires at least one LLD driver."
#endif
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief Driver state machine possible states.
*/
typedef enum {
CRC_UNINIT, /* Not initialized. */
CRC_STOP, /* Stopped. */
CRC_READY, /* Ready. */
CRC_ACTIVE, /* Calculating CRC. */
CRC_COMPLETE /* Asynchronous operation complete. */
} crcstate_t;
#include "hal_crc_lld.h"
#include "crcsw.h" /* Include software LL driver */
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/**
* @name Low level driver helper macros
* @{
*/
/**
* @brief Wakes up the waiting thread.
*
* @param[in] crcp pointer to the @p CRCDriver object
*
* @notapi
*/
#define _crc_wakeup_isr(crcp) { \
osalSysLockFromISR(); \
osalThreadResumeI(&(crcp)->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] crcp pointer to the @p CRCDriver object
*
* @notapi
*/
#define _crc_isr_code(crcp, crc) { \
if ((crcp)->config->end_cb) { \
(crcp)->state = CRC_COMPLETE; \
(crcp)->config->end_cb(crcp, crc); \
if ((crcp)->state == CRC_COMPLETE) \
(crcp)->state = CRC_READY; \
} \
else \
(crcp)->state = CRC_READY; \
_crc_wakeup_isr(crcp); \
}
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
void crcInit(void);
void crcObjectInit(CRCDriver *crcp);
void crcStart(CRCDriver *crcp, const CRCConfig *config);
void crcStop(CRCDriver *crcp);
void crcReset(CRCDriver *crcp);
void crcResetI(CRCDriver *crcp);
uint32_t crcCalc(CRCDriver *crcp, size_t n, const void *buf);
uint32_t crcCalcI(CRCDriver *crcp, size_t n, const void *buf);
#if CRC_USE_DMA == TRUE
void crcStartCalc(CRCDriver *crcp, size_t n, const void *buf);
void crcStartCalcI(CRCDriver *crcp, size_t n, const void *buf);
#endif
#if CRC_USE_MUTUAL_EXCLUSION == TRUE
void crcAcquireUnit(CRCDriver *crcp);
void crcReleaseUnit(CRCDriver *crcp);
#endif
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_CRC */
#endif /* _CRC_H_ */
/** @} */
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