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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011 Giovanni Di Sirio,
2011 Florian Goebe, Chair for Computer Science 11,
RWTH Aachen University
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 AT91SAM7/ext_lld.h
* @brief AT91SAM7 EXT subsystem low level driver header.
*
* @addtogroup EXT
* @{
*/
#ifndef _EXT_LLD_H_
#define _EXT_LLD_H_
#if HAL_USE_EXT || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/**
* @brief Pointer to the SAM7 AIC register block.
*/
#define SAM7_EXT_AIC ((AT91PS_AIC *)AT91C_BASE_AIC)
/**
* @brief Number of channels within one ext driver.
*/
#define EXT_MAX_CHANNELS 32
/**
* @brief Mask of priority bits in interrupt mode register.
*/
#define SAM7_EXT_PRIORITY_MASK 0x00000007
/**
* @brief Shifter for priority bits in interrupt mode register.
*/
#define SAM7_EXT_PRIORITY_SHIFTER 0
/**
* @brief Shifter for mode bits in interrupt mode register.
*/
#define SAM7_EXT_MODE_SHIFTER 5
/*
* On the SAM7 architecture, a single channel can only be enables or disabled
* Hence, undefine the other channel mode constants
*/
#ifdef EXT_CH_MODE_RISING_EDGE
#undef EXT_CH_MODE_RISING_EDGE
#endif
#ifdef EXT_CH_MODE_FALLING_EDGE
#undef EXT_CH_MODE_FALLING_EDGE
#endif
#ifdef EXT_CH_MODE_BOTH_EDGES
#undef EXT_CH_MODE_BOTH_EDGES
#endif
/**
* @name EXT channels mode
* @{
*/
#define EXT_CH_MODE_ENABLED 1 /**< @brief Channel is enabled. */
/** @} */
/**
* @name EXT drivers mode
* @{
*/
/**
* @brief Mask for modes.
*/
#define SAM7_EXT_MODE_MASK AT91C_AIC_SRCTYPE
/**
* @brief Falling edge callback.
*/
#define SAM7_EXT_MODE_FALLING_EDGE AT91C_AIC_SRCTYPE_EXT_NEGATIVE_EDGE
/**
* @brief Rising edge callback.
*/
#define SAM7_EXT_MODE_RISING_EDGE AT91C_AIC_SRCTYPE_POSITIVE_EDGE
/**
* @brief High-level callback.
*/
#define SAM7_EXT_MODE_HIGH_LEVEL AT91C_AIC_SRCTYPE_HIGH_LEVEL
/**
* @brief Low-level callback.
*/
#define SAM7_EXT_MODE_LOW_LEVEL AT91C_AIC_SRCTYPE_EXT_LOW_LEVEL
/** @} */
/**
* @name EXT drivers priorities
* @{
*/
#define SAM7_EXT_PRIOR_HIGHEST AT91C_AIC_PRIOR_HIGHEST
#define SAM7_EXT_PRIOR_LOWEST AT91C_AIC_PRIOR_LOWEST
/** @} */
/*===========================================================================*/
/* Driver pre-compile time settings. */
/*===========================================================================*/
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief EXT channel identifier.
*/
typedef uint32_t expchannel_t;
/**
* @brief Type of an EXT generic notification callback.
*
* @param[in] extp pointer to the @p EXPDriver object triggering the
* callback
*/
typedef void (*extcallback_t)(EXTDriver *extp, expchannel_t channel);
/**
* @brief Channel configuration structure.
*/
typedef struct {
/**
* @brief Channel mode.
*/
uint32_t mode;
/**
* @brief Channel callback.
* @details In the STM32 implementation a @p NULL callback pointer is
* valid and configures the channel as an event sources instead
* of an interrupt source.
*/
extcallback_t cb;
} EXTChannelConfig;
/**
* @brief Driver configuration structure.
* @note It could be empty on some architectures.
*/
typedef struct {
/**
* @brief Channel configurations.
*/
EXTChannelConfig channels[EXT_MAX_CHANNELS];
/* End of the mandatory fields.*/
/**
* @brief interrupt mode.
*/
uint32_t mode;
/**
* @brief interrupt priority.
*/
uint32_t priority;
} EXTConfig;
/**
* @brief Structure representing an EXT driver.
*/
struct EXTDriver {
/**
* @brief Driver state.
*/
extstate_t state;
/**
* @brief Current configuration data.
*/
const EXTConfig *config;
/* End of the mandatory fields.*/
/**
* @brief Pointer to the corresponding PIO registers block.
*/
AT91PS_PIO pio;
/**
* @brief peripheral ID of the corresponding PIO block.
*/
uint32_t pid;
};
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/**
* @brief Computes the content for the interrupt source mode register.
*/
#define SAM7_computeSMR(mode, prio) ( \
((mode & SAM7_EXT_MODE_MASK) << SAM7_EXT_MODE_SHIFTER) | \
((prio & SAM7_EXT_PRIORITY_MASK) << SAM7_EXT_PRIORITY_SHIFTER) \
)
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#if !defined(__DOXYGEN__)
extern EXTDriver EXTDA;
#if (SAM7_PLATFORM == SAM7X128) || (SAM7_PLATFORM == SAM7X256) || \
(SAM7_PLATFORM == SAM7X512)
extern EXTDriver EXTDB;
#endif
#endif
#ifdef __cplusplus
extern "C" {
#endif
void ext_lld_init(void);
void ext_lld_start(EXTDriver *extp);
void ext_lld_stop(EXTDriver *extp);
void ext_lld_channel_enable(EXTDriver *extp, expchannel_t channel);
void ext_lld_channel_disable(EXTDriver *extp, expchannel_t channel);
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_EXT */
#endif /* _EXT_LLD_H_ */
/** @} */
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