/*
    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/pal_lld.h
 * @brief STM32 GPIO low level driver header
 * @addtogroup STM32_PAL
 * @{
 */

#ifndef _PAL_LLD_H_
#define _PAL_LLD_H_

/*
 * Tricks required to make the TRUE/FALSE declaration inside the library
 * compatible.
 */
#ifndef __STM32F10x_H
#undef FALSE
#undef TRUE
#include <stm32f10x.h>
#define FALSE 0
#define TRUE (!FALSE)
#endif

/*===========================================================================*/
/* 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 initialized 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 !defined(STM32F10X_LD) || defined(__DOXYGEN__)
  /** @brief Port E setup data.*/
  stm32_gpio_setup_t    PEData;
#endif
#if defined(STM32F10X_HD) || defined(__DOXYGEN__)
  /** @brief Port F setup data.*/
  stm32_gpio_setup_t    PFData;
  /** @brief Port G setup data.*/
  stm32_gpio_setup_t    PGData;
#endif
} STM32GPIOConfig;

/**
 * @brief Width, in bits, of an I/O port.
 */
#define PAL_IOPORTS_WIDTH 16

/**
 * @brief Whole port mask.
 * @brief 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.
 */
#define IOPORT1         GPIOA

/**
 * @brief GPIO port B identifier.
 */
#define IOPORT2         GPIOB

/**
 * @brief GPIO port C identifier.
 */
#define IOPORT3         GPIOC

/**
 * @brief GPIO port D identifier.
 */
#define IOPORT4         GPIOD

/**
 * @brief GPIO port E identifier.
 */
#if !defined(STM32F10X_LD) || defined(__DOXYGEN__)
#define IOPORT5         GPIOE
#endif

/**
 * @brief GPIO port F identifier.
 */
#if defined(STM32F10X_HD) || defined(__DOXYGEN__)
#define IOPORT6         GPIOF

/**
 * @brief GPIO port G identifier.
 */
#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.
 */
#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.
 *
 * @param[in] port the port identifier
 * @return the port bits
 *
 * @note This function is not meant to be invoked directly by the application
 *       code.
 */
#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.
 *
 * @param[in] port the port identifier
 * @return The latched logical states.
 *
 * @note This function is not meant to be invoked directly by the application
 *       code.
 */
#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.
 *
 * @param[in] port the port identifier
 * @param[in] bits the bits to be written on the specified port
 *
 * @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.
 */
#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.
 *
 * @param[in] port the port identifier
 * @param[in] bits the bits to be ORed on the specified port
 *
 * @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.
 */
#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.
 *
 * @param[in] port the port identifier
 * @param[in] bits the bits to be cleared on the specified port
 *
 * @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.
 */
#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.
 *
 * @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.
 *
 * @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.
 */
#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.
 *
 * @param[in] port the port identifier
 * @param[in] mask the group mask
 * @param[in] mode the 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.
 */
#define pal_lld_setgroupmode(port, mask, mode) \
  _pal_lld_setgroupmode(port, mask, mode)

/**
 * @brief Writes a logical state on an output pad.
 *
 * @param[in] port the port identifier
 * @param[in] pad the pad number within the port
 * @param[out] bit the logical value, the value must be @p 0 or @p 1
 *
 * @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.
 */
#define pal_lld_writepad(port, pad, bit) pal_lld_writegroup(port, 1, pad, bit)

#ifdef __cplusplus
extern "C" {
#endif
  void _pal_lld_init(const STM32GPIOConfig *config);
  void _pal_lld_setgroupmode(ioportid_t port,
                             ioportmask_t mask,
                             uint_fast8_t mode);
#ifdef __cplusplus
}
#endif

#endif /* _PAL_LLD_H_ */

/** @} */