text: /*
      ChibiOS - Copyright (C) 2014-2015 Fabio Utzig
  
      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    MK20D5/pal_lld.h
   * @brief   PAL subsystem 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                                      */
  /*===========================================================================*/
  
  #define PAL_MODE_ALTERNATIVE_1      10
  #define PAL_MODE_ALTERNATIVE_2      11
  #define PAL_MODE_ALTERNATIVE_3      12
  #define PAL_MODE_ALTERNATIVE_4      13
  #define PAL_MODE_ALTERNATIVE_5      14
  #define PAL_MODE_ALTERNATIVE_6      15
  #define PAL_MODE_ALTERNATIVE_7      16
  
  #define PIN_MUX_ALTERNATIVE(x)      PORTx_PCRn_MUX(x)
  
  /*===========================================================================*/
  /* I/O Ports Types and constants.                                            */
  /*===========================================================================*/
  
  #define TOTAL_PORTS                 5
  #define PADS_PER_PORT               32
  
  /**
   * @brief   Width, in bits, of an I/O port.
   */
  #define PAL_IOPORTS_WIDTH 32
  
  /**
   * @brief   Whole port mask.
   * @brief   This macro specifies all the valid bits into a port.
   */
  #define PAL_WHOLE_PORT ((ioportmask_t)0xFFFFFFFF)
  
  /**
   * @brief   Digital I/O port sized unsigned type.
   */
  typedef uint32_t ioportmask_t;
  
  /**
   * @brief   Digital I/O modes.
   */
  typedef uint32_t iomode_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;
  
  /**
   * @brief   Port Configuration.
   * @details This structure stores the configuration parameters of all pads
   *          belonging to a port.
   */
  typedef struct {
      ioportid_t      port;
      iomode_t        pads[PADS_PER_PORT];
  } PortConfig;
  
  /**
   * @brief   Generic I/O ports 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.
   * @note    Implementations may extend this structure to contain more,
   *          architecture dependent, fields.
   */
  typedef struct {
      PortConfig      ports[TOTAL_PORTS];
  } PALConfig;
  
  /*===========================================================================*/
  /* I/O Ports Identifiers.                                                    */
  /*===========================================================================*/
  
  /**
   * @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.
   */
  #define IOPORT5          GPIOE
  
  /*===========================================================================*/
  /* Implementation, some of the following macros could be implemented as      */
  /* functions, if so please put them in pal_lld.c.                            */
  /*===========================================================================*/
  
  /**
   * @brief   Low level PAL subsystem initialization.
   *
   * @param[in] config    architecture-dependent ports configuration
   *
   * @notapi
   */
  #define pal_lld_init(config) _pal_lld_init(config)
  
  /**
   * @brief   Reads the physical I/O port states.
   *
   * @param[in] port      port identifier
   * @return              The port bits.
   *
   * @notapi
   */
  #define pal_lld_readport(port) (port)->PDIR
  
  /**
   * @brief   Reads the output latch.
   * @details The purpose of this function is to read back the latched output
   *          value.
   *
   * @param[in] port      port identifier
   * @return              The latched logical states.
   *
   * @notapi
   */
  #define pal_lld_readlatch(port) (port)->PDOR
  
  /**
   * @brief   Writes a bits mask on a I/O port.
   *
   * @param[in] port      port identifier
   * @param[in] bits      bits to be written on the specified port
   *
   * @notapi
   */
  #define pal_lld_writeport(port, bits) (port)->PDOR = (bits)
  
  /**
   * @brief   Sets a bits mask on a I/O port.
   * @note    The @ref PAL provides a default software implementation of this
   *          functionality, implement this function if can optimize it by using
   *          special hardware functionalities or special coding.
   *
   * @param[in] port      port identifier
   * @param[in] bits      bits to be ORed on the specified port
   *
   * @notapi
   */
  #define pal_lld_setport(port, bits) (port)->PSOR |= (bits)
  
  /**
   * @brief   Clears a bits mask on a I/O port.
   * @note    The @ref PAL provides a default software implementation of this
   *          functionality, implement this function if can optimize it by using
   *          special hardware functionalities or special coding.
   *
   * @param[in] port      port identifier
   * @param[in] bits      bits to be cleared on the specified port
   *
   * @notapi
   */
  #define pal_lld_clearport(port, bits) (port)->PCOR |= (bits)
  
  /**
   * @brief   Toggles a bits mask on a I/O port.
   * @note    The @ref PAL provides a default software implementation of this
   *          functionality, implement this function if can optimize it by using
   *          special hardware functionalities or special coding.
   *
   * @param[in] port      port identifier
   * @param[in] bits      bits to be toggled on the specified port
   *
   * @notapi
   */
  #define pal_lld_toggleport(port, bits) (port)->PTOR |= (bits)
  
  /**
   * @brief   Reads a group of bits.
   * @note    The @ref PAL provides a default software implementation of this
   *          functionality, implement this function if can optimize it by using
   *          special hardware functionalities or special coding.
   *
   * @param[in] port      port identifier
   * @param[in] mask      group mask
   * @param[in] offset    group bit offset within the port
   * @return              The group logical states.
   *
   * @notapi
   */
  #define pal_lld_readgroup(port, mask, offset) 0
  
  /**
   * @brief   Writes a group of bits.
   * @note    The @ref PAL provides a default software implementation of this
   *          functionality, implement this function if can optimize it by using
   *          special hardware functionalities or special coding.
   *
   * @param[in] port      port identifier
   * @param[in] mask      group mask
   * @param[in] offset    group bit offset within the port
   * @param[in] bits      bits to be written. Values exceeding the group width
   *                      are masked.
   *
   * @notapi
   */
  #define pal_lld_writegroup(port, mask, offset, bits) (void)bits
  
  /**
   * @brief   Pads group mode setup.
   * @details This function programs a pads group belonging to the same port
   *          with the specified mode.
   * @note    Programming an unknown or unsupported mode is silently ignored.
   *
   * @param[in] port      port identifier
   * @param[in] mask      group mask
   * @param[in] offset    group bit offset within the port
   * @param[in] mode      group mode
   *
   * @notapi
   */
  #define pal_lld_setgroupmode(port, mask, offset, mode)                      \
    _pal_lld_setgroupmode(port, mask << offset, mode)
  
  /**
   * @brief   Reads a logical state from an I/O pad.
   * @note    The @ref PAL provides a default software implementation of this
   *          functionality, implement this function if can optimize it by using
   *          special hardware functionalities or special coding.
   *
   * @param[in] port      port identifier
   * @param[in] pad       pad number within the port
   * @return              The logical state.
   * @retval PAL_LOW      low logical state.
   * @retval PAL_HIGH     high logical state.
   *
   * @notapi
   */
  #define pal_lld_readpad(port, pad) _pal_lld_readpad(port, pad)
  
  /**
   * @brief   Writes a logical state on an output pad.
   * @note    This function is not meant to be invoked directly by the
   *          application  code.
   * @note    The @ref PAL provides a default software implementation of this
   *          functionality, implement this function if can optimize it by using
   *          special hardware functionalities or special coding.
   *
   * @param[in] port      port identifier
   * @param[in] pad       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_writepad(port, pad, bit)
  
  /**
   * @brief   Sets a pad logical state to @p PAL_HIGH.
   * @note    The @ref PAL provides a default software implementation of this
   *          functionality, implement this function if can optimize it by using
   *          special hardware functionalities or special coding.
   *
   * @param[in] port      port identifier
   * @param[in] pad       pad number within the port
   *
   * @notapi
   */
  #define pal_lld_setpad(port, pad) (port)->PSOR |= ((uint32_t) 1 << (pad))
  
  /**
   * @brief   Clears a pad logical state to @p PAL_LOW.
   * @note    The @ref PAL provides a default software implementation of this
   *          functionality, implement this function if can optimize it by using
   *          special hardware functionalities or special coding.
   *
   * @param[in] port      port identifier
   * @param[in] pad       pad number within the port
   *
   * @notapi
   */
  #define pal_lld_clearpad(port, pad) (port)->PCOR |= ((uint32_t) 1 << (pad))
  
  /**
   * @brief   Toggles a pad logical state.
   * @note    The @ref PAL provides a default software implementation of this
   *          functionality, implement this function if can optimize it by using
   *          special hardware functionalities or special coding.
   *
   * @param[in] port      port identifier
   * @param[in] pad       pad number within the port
   *
   * @notapi
   */
  #define pal_lld_togglepad(port, pad) (port)->PTOR |= ((uint32_t) 1 << (pad))
  
  /**
   * @brief   Pad mode setup.
   * @details This function programs a pad with the specified mode.
   * @note    The @ref PAL provides a default software implementation of this
   *          functionality, implement this function if can optimize it by using
   *          special hardware functionalities or special coding.
   * @note    Programming an unknown or unsupported mode is silently ignored.
   *
   * @param[in] port      port identifier
   * @param[in] pad       pad number within the port
   * @param[in] mode      pad mode
   *
   * @notapi
   */
  #define pal_lld_setpadmode(port, pad, mode)                                 \
      _pal_lld_setpadmode(port, pad, mode)
  
  #if !defined(__DOXYGEN__)
  extern const PALConfig pal_default_config;
  #endif
  
  #ifdef __cplusplus
  extern "C" {
  #endif
    void _pal_lld_init(const PALConfig *config);
    void _pal_lld_setgroupmode(ioportid_t port,
                               ioportmask_t mask,
                               iomode_t mode);
    void _pal_lld_setpadmode(ioportid_t port,
                             uint8_t pad,
                             iomode_t mode);
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* HAL_USE_PAL */
  
  #endif /* _PAL_LLD_H_ */
  
  /** @} */
  