text: /*
      ChibiOS/HAL - Copyright (C) 2006-2014 Giovanni Di Sirio
  
      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.
  */
  /*
     Concepts and parts of this file have been contributed by Uladzimir Pylinsky
     aka barthess.
   */
  
  /**
   * @file    fsmc_sram.c
   * @brief   SRAM Driver subsystem low level driver source.
   *
   * @addtogroup SRAM
   * @{
   */
  #include "hal.h"
  #include "fsmc_sram.h"
  
  #if STM32_USE_FSMC_SRAM || defined(__DOXYGEN__)
  
  /*===========================================================================*/
  /* Driver local definitions.                                                 */
  /*===========================================================================*/
  
  /*===========================================================================*/
  /* Driver exported variables.                                                */
  /*===========================================================================*/
  /**
   * @brief   SRAM1 driver identifier.
   */
  #if STM32_SRAM_USE_FSMC_SRAM1 || defined(__DOXYGEN__)
  SRAMDriver SRAMD1;
  #endif
  
  /**
   * @brief   SRAM2 driver identifier.
   */
  #if STM32_SRAM_USE_FSMC_SRAM2 || defined(__DOXYGEN__)
  SRAMDriver SRAMD2;
  #endif
  
  /**
   * @brief   SRAM3 driver identifier.
   */
  #if STM32_SRAM_USE_FSMC_SRAM3 || defined(__DOXYGEN__)
  SRAMDriver SRAMD3;
  #endif
  
  /**
   * @brief   SRAM4 driver identifier.
   */
  #if STM32_SRAM_USE_FSMC_SRAM4 || defined(__DOXYGEN__)
  SRAMDriver SRAMD4;
  #endif
  
  /*===========================================================================*/
  /* Driver local types.                                                       */
  /*===========================================================================*/
  
  /*===========================================================================*/
  /* Driver local variables and types.                                         */
  /*===========================================================================*/
  
  /*===========================================================================*/
  /* Driver local functions.                                                   */
  /*===========================================================================*/
  
  /*===========================================================================*/
  /* Driver interrupt handlers.                                                */
  /*===========================================================================*/
  
  /*===========================================================================*/
  /* Driver exported functions.                                                */
  /*===========================================================================*/
  
  /**
   * @brief   Low level SRAM driver initialization.
   *
   * @notapi
   */
  void fsmcSramInit(void) {
  
    fsmc_init();
  
  #if STM32_SRAM_USE_FSMC_SRAM1
    SRAMD1.sram = FSMCD1.sram1;
    SRAMD1.state = SRAM_STOP;
  #endif /* STM32_SRAM_USE_FSMC_SRAM1 */
  
  #if STM32_SRAM_USE_FSMC_SRAM2
    SRAMD2.sram = FSMCD1.sram2;
    SRAMD2.state = SRAM_STOP;
  #endif /* STM32_SRAM_USE_FSMC_SRAM2 */
  
  #if STM32_SRAM_USE_FSMC_SRAM3
    SRAMD3.sram = FSMCD1.sram3;
    SRAMD3.state = SRAM_STOP;
  #endif /* STM32_SRAM_USE_FSMC_SRAM3 */
  
  #if STM32_SRAM_USE_FSMC_SRAM4
    SRAMD4.sram = FSMCD1.sram4;
    SRAMD4.state = SRAM_STOP;
  #endif /* STM32_SRAM_USE_FSMC_SRAM4 */
  }
  
  /**
   * @brief   Configures and activates the SRAM peripheral.
   *
   * @param[in] sramp         pointer to the @p SRAMDriver object
   * @param[in] cfgp          pointer to the @p SRAMConfig object
   *
   * @notapi
   */
  void fsmcSramStart(SRAMDriver *sramp, const SRAMConfig *cfgp) {
  
    if (FSMCD1.state == FSMC_STOP)
      fsmc_start(&FSMCD1);
  
    osalDbgAssert((sramp->state == SRAM_STOP) || (sramp->state == SRAM_READY),
                "invalid state");
  
    if (sramp->state == SRAM_STOP) {
      sramp->sram->BCR = FSMC_BCR_WREN | FSMC_BCR_MBKEN | FSMC_BCR_MWID_0;
      sramp->sram->BTR = cfgp->btr;
      sramp->state = SRAM_READY;
    }
  }
  
  /**
   * @brief   Deactivates the SRAM peripheral.
   *
   * @param[in] sramp         pointer to the @p SRAMDriver object
   *
   * @notapi
   */
  void fsmcSramStop(SRAMDriver *sramp) {
  
    if (sramp->state == SRAM_READY) {
      sramp->sram->BCR &= ~FSMC_BCR_MBKEN;
      sramp->state = SRAM_STOP;
    }
  }
  
  #endif /* STM32_USE_FSMC_SRAM */
  
  /** @} */
  
  