text: /* mbed Microcontroller Library
   *******************************************************************************
   * Copyright (c) 2015, STMicroelectronics
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   * 3. Neither the name of STMicroelectronics nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *******************************************************************************
   */
  #include "mbed_assert.h"
  #include "mbed_error.h"
  #include "spi_api.h"
  
  #if DEVICE_SPI
  
  #include "cmsis.h"
  #include "pinmap.h"
  #include "mbed_error.h"
  #include "PeripheralPins.h"
  
  #if DEVICE_SPI_ASYNCH
      #define SPI_S(obj)    (( struct spi_s *)(&(obj->spi)))
  #else
      #define SPI_S(obj)    (( struct spi_s *)(obj))
  #endif
  
  
  /*
   * Only the frequency is managed in the family specific part
   * the rest of SPI management is common to all STM32 families
   */
  int spi_get_clock_freq(spi_t *obj) {
      struct spi_s *spiobj = SPI_S(obj);
  	int spi_hz = 0;
  
  	/* Get source clock depending on SPI instance */
      switch ((int)spiobj->spi) {
          case SPI_1:
  			/* SPI_1. Source CLK is PCKL2 */
  			spi_hz = HAL_RCC_GetPCLK2Freq();
  			break;
  #if defined(SPI2_BASE)
  		case SPI_2:
  			/* SPI_2. Source CLK is PCKL1 */
  			spi_hz = HAL_RCC_GetPCLK1Freq();
  			break;
  #endif
  		default:
  			error("CLK: SPI instance not set");
              break;
      }
      return spi_hz;
  }
  
  #endif
  