mirror of https://github.com/ARMmbed/mbed-os.git
90 lines
3.1 KiB
C
90 lines
3.1 KiB
C
/* mbed Microcontroller Library
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*******************************************************************************
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* Copyright (c) 2014, STMicroelectronics
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************
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*/
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#include "mbed_assert.h"
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#include "mbed_error.h"
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#include "spi_api.h"
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#if DEVICE_SPI
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#include "cmsis.h"
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#include "pinmap.h"
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#include "PeripheralPins.h"
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#if DEVICE_SPI_ASYNCH
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#define SPI_S(obj) (( struct spi_s *)(&(obj->spi)))
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#else
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#define SPI_S(obj) (( struct spi_s *)(obj))
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#endif
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/*
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* Only the frequency is managed in the family specific part
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* the rest of SPI management is common to all STM32 families
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*/
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int spi_get_clock_freq(spi_t *obj)
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{
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struct spi_s *spiobj = SPI_S(obj);
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int spi_hz = 0;
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/* Get source clock depending on SPI instance */
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switch ((int)spiobj->spi) {
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#if defined SPI1_BASE
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case SPI_1:
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/* SPI_1. Source CLK is PCKL2 */
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spi_hz = HAL_RCC_GetPCLK2Freq();
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break;
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#endif
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#if defined SPI2_BASE
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case SPI_2:
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/* SPI_2 and SPI_3. Source CLK is PCKL1 */
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spi_hz = HAL_RCC_GetPCLK1Freq();
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break;
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#endif
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#if defined SPI3_BASE
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case SPI_3:
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/* SPI_2 and SPI_3. Source CLK is PCKL1 */
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spi_hz = HAL_RCC_GetPCLK1Freq();
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break;
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#endif
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#if defined SPI4_BASE
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case SPI_4:
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/* SPI_4. Source CLK is PCKL2 */
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spi_hz = HAL_RCC_GetPCLK2Freq();
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break;
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#endif
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default:
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error("CLK: SPI instance not set");
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break;
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}
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return spi_hz;
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}
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#endif
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