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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 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/pal_lld.h
* @brief STM32 GPIO low level driver header.
*
* @addtogroup PAL
* @{
*/
#ifndef _PAL_LLD_H_
#define _PAL_LLD_H_
#if HAL_USE_PAL || defined(__DOXYGEN__)
/*===========================================================================*/
/* Unsupported modes and specific modes */
/*===========================================================================*/
/**
* @brief STM32 specific alternate push-pull output mode.
*/
#define PAL_MODE_STM32_ALTERNATE_PUSHPULL 16
/**
* @brief STM32 specific alternate open-drain output mode.
*/
#define PAL_MODE_STM32_ALTERNATE_OPENDRAIN 17
/*===========================================================================*/
/* I/O Ports Types and constants. */
/*===========================================================================*/
/**
* @brief GPIO port setup info.
*/
typedef struct {
/** Initial value for ODR register.*/
uint32_t odr;
/** Initial value for CRL register.*/
uint32_t crl;
/** Initial value for CRH register.*/
uint32_t crh;
} stm32_gpio_setup_t;
/**
* @brief STM32 GPIO static initializer.
* @details An instance of this structure must be passed to @p palInit() at
* system startup time in order to initialize the digital I/O
* subsystem. This represents only the initial setup, specific pads
* or whole ports can be reprogrammed at later time.
*/
typedef struct {
/** @brief Port A setup data.*/
stm32_gpio_setup_t PAData;
/** @brief Port B setup data.*/
stm32_gpio_setup_t PBData;
/** @brief Port C setup data.*/
stm32_gpio_setup_t PCData;
/** @brief Port D setup data.*/
stm32_gpio_setup_t PDData;
#if STM32_HAS_GPIOE || defined(__DOXYGEN__)
/** @brief Port E setup data.*/
stm32_gpio_setup_t PEData;
#if STM32_HAS_GPIOF || defined(__DOXYGEN__)
/** @brief Port F setup data.*/
stm32_gpio_setup_t PFData;
#if STM32_HAS_GPIOG || defined(__DOXYGEN__)
/** @brief Port G setup data.*/
stm32_gpio_setup_t PGData;
#endif
#endif
#endif
} PALConfig;
/**
* @brief Width, in bits, of an I/O port.
*/
#define PAL_IOPORTS_WIDTH 16
/**
* @brief Whole port mask.
* @details This macro specifies all the valid bits into a port.
*/
#define PAL_WHOLE_PORT ((ioportmask_t)0xFFFF)
/**
* @brief Digital I/O port sized unsigned type.
*/
typedef uint32_t ioportmask_t;
/**
* @brief Port Identifier.
* @details This type can be a scalar or some kind of pointer, do not make
* any assumption about it, use the provided macros when populating
* variables of this type.
*/
typedef GPIO_TypeDef * ioportid_t;
/*===========================================================================*/
/* I/O Ports Identifiers. */
/* The low level driver wraps the definitions already present in the STM32 */
/* firmware library. */
/*===========================================================================*/
/**
* @brief GPIO port A identifier.
*/
#if STM32_HAS_GPIOA || defined(__DOXYGEN__)
#define IOPORT1 GPIOA
#endif
/**
* @brief GPIO port B identifier.
*/
#if STM32_HAS_GPIOB || defined(__DOXYGEN__)
#define IOPORT2 GPIOB
#endif
/**
* @brief GPIO port C identifier.
*/
#if STM32_HAS_GPIOC || defined(__DOXYGEN__)
#define IOPORT3 GPIOC
#endif
/**
* @brief GPIO port D identifier.
*/
#if STM32_HAS_GPIOD || defined(__DOXYGEN__)
#define IOPORT4 GPIOD
#endif
/**
* @brief GPIO port E identifier.
*/
#if STM32_HAS_GPIOE || defined(__DOXYGEN__)
#define IOPORT5 GPIOE
#endif
/**
* @brief GPIO port F identifier.
*/
#if STM32_HAS_GPIOF || defined(__DOXYGEN__)
#define IOPORT6 GPIOF
#endif
/**
* @brief GPIO port G identifier.
*/
#if STM32_HAS_GPIOG || defined(__DOXYGEN__)
#define IOPORT7 GPIOG
#endif
/*===========================================================================*/
/* Implementation, some of the following macros could be implemented as */
/* functions, please put them in a file named ioports_lld.c if so. */
/*===========================================================================*/
/**
* @brief GPIO ports subsystem initialization.
*
* @notapi
*/
#define pal_lld_init(config) _pal_lld_init(config)
/**
* @brief Reads an I/O port.
* @details This function is implemented by reading the GPIO IDR register, the
* implementation has no side effects.
* @note This function is not meant to be invoked directly by the application
* code.
*
* @param[in] port the port identifier
* @return The port bits.
*
* @notapi
*/
#define pal_lld_readport(port) ((port)->IDR)
/**
* @brief Reads the output latch.
* @details This function is implemented by reading the GPIO ODR register, the
* implementation has no side effects.
* @note This function is not meant to be invoked directly by the application
* code.
*
* @param[in] port the port identifier
* @return The latched logical states.
*
* @notapi
*/
#define pal_lld_readlatch(port) ((port)->ODR)
/**
* @brief Writes on a I/O port.
* @details This function is implemented by writing the GPIO ODR register, the
* implementation has no side effects.
* @note This function is not meant to be invoked directly by the
* application code.
* @note Writing on pads programmed as pull-up or pull-down has the side
* effect to modify the resistor setting because the output latched
* data is used for the resistor selection.
*
* @param[in] port the port identifier
* @param[in] bits the bits to be written on the specified port
*
* @notapi
*/
#define pal_lld_writeport(port, bits) ((port)->ODR = (bits))
/**
* @brief Sets a bits mask on a I/O port.
* @details This function is implemented by writing the GPIO BSRR register, the
* implementation has no side effects.
* @note This function is not meant to be invoked directly by the
* application code.
* @note Writing on pads programmed as pull-up or pull-down has the side
* effect to modify the resistor setting because the output latched
* data is used for the resistor selection.
*
* @param[in] port the port identifier
* @param[in] bits the bits to be ORed on the specified port
*
* @notapi
*/
#define pal_lld_setport(port, bits) ((port)->BSRR = (bits))
/**
* @brief Clears a bits mask on a I/O port.
* @details This function is implemented by writing the GPIO BRR register, the
* implementation has no side effects.
* @note This function is not meant to be invoked directly by the
* application code.
* @note Writing on pads programmed as pull-up or pull-down has the side
* effect to modify the resistor setting because the output latched
* data is used for the resistor selection.
*
* @param[in] port the port identifier
* @param[in] bits the bits to be cleared on the specified port
*
* @notapi
*/
#define pal_lld_clearport(port, bits) ((port)->BRR = (bits))
/**
* @brief Writes a group of bits.
* @details This function is implemented by writing the GPIO BSRR register, the
* implementation has no side effects.
* @note This function is not meant to be invoked directly by the
* application code.
* @note Writing on pads programmed as pull-up or pull-down has the side
* effect to modify the resistor setting because the output latched
* data is used for the resistor selection.
*
* @param[in] port the port identifier
* @param[in] mask the group mask
* @param[in] offset the group bit offset within the port
* @param[in] bits the bits to be written. Values exceeding the group
* width are masked.
*
* @notapi
*/
#define pal_lld_writegroup(port, mask, offset, bits) { \
(port)->BSRR = ((~(bits) & (mask)) << (16 + (offset))) | \
(((bits) & (mask)) << (offset)); \
}
/**
* @brief Pads group mode setup.
* @details This function programs a pads group belonging to the same port
* with the specified mode.
* @note This function is not meant to be invoked directly by the
* application code.
* @note Writing on pads programmed as pull-up or pull-down has the side
* effect to modify the resistor setting because the output latched
* data is used for the resistor selection.
*
* @param[in] port the port identifier
* @param[in] mask the group mask
* @param[in] mode the mode
*
* @notapi
*/
#define pal_lld_setgroupmode(port, mask, mode) \
_pal_lld_setgroupmode(port, mask, mode)
/**
* @brief Writes a logical state on an output pad.
* @note This function is not meant to be invoked directly by the
* application code.
* @note Writing on pads programmed as pull-up or pull-down has the side
* effect to modify the resistor setting because the output latched
* data is used for the resistor selection.
*
* @param[in] port the port identifier
* @param[in] pad the pad number within the port
* @param[in] bit logical value, the value must be @p PAL_LOW or
* @p PAL_HIGH
*
* @notapi
*/
#define pal_lld_writepad(port, pad, bit) pal_lld_writegroup(port, 1, pad, bit)
extern const PALConfig pal_default_config;
#ifdef __cplusplus
extern "C" {
#endif
void _pal_lld_init(const PALConfig *config);
void _pal_lld_setgroupmode(ioportid_t port,
ioportmask_t mask,
uint_fast8_t mode);
#ifdef __cplusplus
}
#endif
#endif /* HAL_USE_PAL */
#endif /* _PAL_LLD_H_ */
/** @} */
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