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/*
ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file STM32/can_lld.h
* @brief STM32 CAN subsystem low level driver header
* @addtogroup STM32_CAN
* @{
*/
#ifndef _CAN_LLD_H_
#define _CAN_LLD_H_
#if CH_HAL_USE_CAN || defined(__DOXYGEN__)
/**
* @brief This switch defines whether the driver implementation supports
* a low power switch mode with automatic an wakeup feature.
*/
#define CAN_SUPPORTS_SLEEP TRUE
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/**
* @brief Sleep mode related APIs inclusion switch.
* @note This switch is enforced to @p FALSE if the driver implementation
* does not support the sleep mode.
*/
#if CAN_SUPPORTS_SLEEP || defined(__DOXYGEN__)
#if !defined(CAN_USE_SLEEP_MODE) || defined(__DOXYGEN__)
#define CAN_USE_SLEEP_MODE TRUE
#endif
#else /* !CAN_SUPPORTS_SLEEP */
#define CAN_USE_SLEEP_MODE FALSE
#endif /* !CAN_SUPPORTS_SLEEP */
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief CAN frame.
* @note Accessing the frame data as word16 or word32 is not portable because
* machine data endianness, it can be still useful for a quick filling.
*/
typedef struct {
uint8_t cf_DLC:4; /**< @brief Data length. */
uint8_t cf_IDE:1; /**< @brief Identifier type. */
uint8_t cf_RTR:1; /**< @brief Frame type. */
uint32_t cf_id; /**< @brief Frame identifier. */
union {
uint8_t cf_data8[8]; /**< @brief Frame data. */
uint16_t cf_data16[4]; /**< @brief Frame data. */
uint32_t cf_data32[2]; /**< @brief Frame data. */
};
} CANFrame;
/**
* @brief Driver configuration structure.
* @note It could be empty on some architectures.
*/
typedef struct {
} CANConfig;
/**
* @brief Structure representing an CAN driver.
*/
typedef struct {
/**
* @brief Driver state.
*/
canstate_t can_state;
/**
* @brief Current configuration data.
*/
const CANConfig *can_config;
/**
* @brief Transmission queue semaphore.
*/
Semaphore can_txsem;
/**
* @brief Receive queue semaphore.
*/
Semaphore can_rxsem;
/**
* @brief One or more frames become available.
*/
EventSource can_rxfull_event;
/**
* @brief One or more transmission slots become available.
*/
EventSource can_txempty_event;
#if CAN_USE_SLEEP_MODE || defined (__DOXYGEN__)
/**
* @brief Entering sleep state event.
*/
EventSource can_sleep_event;
/**
* @brief Exiting sleep state event.
*/
EventSource can_wakeup_event;
#endif /* CAN_USE_SLEEP_MODE */
/* End of the mandatory fields.*/
} CANDriver;
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
void can_lld_init(void);
void can_lld_start(CANDriver *canp);
void can_lld_stop(CANDriver *canp);
bool_t can_lld_can_transmit(CANDriver *canp);
msg_t can_lld_transmit(CANDriver *canp, const CANFrame *cfp);
bool_t can_lld_can_receive(CANDriver *canp);
msg_t can_lld_receive(CANDriver *canp, CANFrame *cfp);
#if CAN_USE_SLEEP_MODE
void can_lld_sleep(CANDriver *canp);
void can_lld_wakeup(CANDriver *canp);
#endif /* CAN_USE_SLEEP_MODE */
#ifdef __cplusplus
}
#endif
#endif /* CH_HAL_USE_CAN */
#endif /* _CAN_LLD_H_ */
/** @} */
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