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/*
Copyright (C) 2015 Stephen Caudle
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 NRF51822/ext_lld.h
* @brief NRF51822 GPIOTE subsystem low level driver header.
*
* @addtogroup EXT
* @{
*/
#ifndef HAL_EXT_LLD_H
#define HAL_EXT_LLD_H
#if HAL_USE_EXT || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver constants. */
/*===========================================================================*/
/**
* @brief Available number of EXT channels.
*/
#define EXT_MAX_CHANNELS 4
#define EXT_MODE_GPIO_MASK 0xF8 /**< @brief Pad field mask. */
#define EXT_MODE_GPIO_OFFSET 3 /**< @brief Pad field offset. */
/** @} */
/*===========================================================================*/
/* 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.*/
} 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.*/
};
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#if !defined(__DOXYGEN__)
extern EXTDriver EXTD1;
#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 /* HAL_EXT_LLD_H */
/** @} */
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