Aditya Mehrotra / mbed-dev

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Dependents:   CAN_TEST SPIne_Plus_DYNO_SENSORS SPIne_Plus_v2 SPIne_Plus_Dyno_v2

targets/TARGET_STM/TARGET_STM32F7/spi_api.c@0:083111ae2a11, 2020-11-26 (annotated)

Committer:
saloutos
Date:
Thu Nov 26 04:08:56 2020 +0000
Revision:
0:083111ae2a11
first commit of leaned mbed dev lib

Who changed what in which revision?

UserRevisionLine numberNew contents of line
saloutos 0:083111ae2a11 1 /* mbed Microcontroller Library
saloutos 0:083111ae2a11 2 *******************************************************************************
saloutos 0:083111ae2a11 3 * Copyright (c) 2015, STMicroelectronics
saloutos 0:083111ae2a11 4 * All rights reserved.
saloutos 0:083111ae2a11 5 *
saloutos 0:083111ae2a11 6 * Redistribution and use in source and binary forms, with or without
saloutos 0:083111ae2a11 7 * modification, are permitted provided that the following conditions are met:
saloutos 0:083111ae2a11 8 *
saloutos 0:083111ae2a11 9 * 1. Redistributions of source code must retain the above copyright notice,
saloutos 0:083111ae2a11 10 * this list of conditions and the following disclaimer.
saloutos 0:083111ae2a11 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
saloutos 0:083111ae2a11 12 * this list of conditions and the following disclaimer in the documentation
saloutos 0:083111ae2a11 13 * and/or other materials provided with the distribution.
saloutos 0:083111ae2a11 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
saloutos 0:083111ae2a11 15 * may be used to endorse or promote products derived from this software
saloutos 0:083111ae2a11 16 * without specific prior written permission.
saloutos 0:083111ae2a11 17 *
saloutos 0:083111ae2a11 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
saloutos 0:083111ae2a11 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
saloutos 0:083111ae2a11 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
saloutos 0:083111ae2a11 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
saloutos 0:083111ae2a11 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
saloutos 0:083111ae2a11 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
saloutos 0:083111ae2a11 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
saloutos 0:083111ae2a11 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
saloutos 0:083111ae2a11 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
saloutos 0:083111ae2a11 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
saloutos 0:083111ae2a11 28 *******************************************************************************
saloutos 0:083111ae2a11 29 */
saloutos 0:083111ae2a11 30 #include "mbed_assert.h"
saloutos 0:083111ae2a11 31 #include "mbed_error.h"
saloutos 0:083111ae2a11 32 #include "spi_api.h"
saloutos 0:083111ae2a11 33
saloutos 0:083111ae2a11 34 #if DEVICE_SPI
saloutos 0:083111ae2a11 35
saloutos 0:083111ae2a11 36 #include "cmsis.h"
saloutos 0:083111ae2a11 37 #include "pinmap.h"
saloutos 0:083111ae2a11 38 #include "PeripheralPins.h"
saloutos 0:083111ae2a11 39 #include "mbed_error.h"
saloutos 0:083111ae2a11 40
saloutos 0:083111ae2a11 41 #if DEVICE_SPI_ASYNCH
saloutos 0:083111ae2a11 42 #define SPI_S(obj) (( struct spi_s *)(&(obj->spi)))
saloutos 0:083111ae2a11 43 #else
saloutos 0:083111ae2a11 44 #define SPI_S(obj) (( struct spi_s *)(obj))
saloutos 0:083111ae2a11 45 #endif
saloutos 0:083111ae2a11 46
saloutos 0:083111ae2a11 47 /*
saloutos 0:083111ae2a11 48 * Only the frequency is managed in the family specific part
saloutos 0:083111ae2a11 49 * the rest of SPI management is common to all STM32 families
saloutos 0:083111ae2a11 50 */
saloutos 0:083111ae2a11 51 int spi_get_clock_freq(spi_t *obj) {
saloutos 0:083111ae2a11 52 struct spi_s *spiobj = SPI_S(obj);
saloutos 0:083111ae2a11 53 int spi_hz = 0;
saloutos 0:083111ae2a11 54
saloutos 0:083111ae2a11 55 /* Get source clock depending on SPI instance */
saloutos 0:083111ae2a11 56 switch ((int)spiobj->spi) {
saloutos 0:083111ae2a11 57 case SPI_1:
saloutos 0:083111ae2a11 58 case SPI_4:
saloutos 0:083111ae2a11 59 case SPI_5:
saloutos 0:083111ae2a11 60 case SPI_6:
saloutos 0:083111ae2a11 61 /* SPI_1, SPI_4, SPI_5 and SPI_6. Source CLK is PCKL2 */
saloutos 0:083111ae2a11 62 spi_hz = HAL_RCC_GetPCLK2Freq();
saloutos 0:083111ae2a11 63 break;
saloutos 0:083111ae2a11 64 case SPI_2:
saloutos 0:083111ae2a11 65 case SPI_3:
saloutos 0:083111ae2a11 66 /* SPI_2 and SPI_3. Source CLK is PCKL1 */
saloutos 0:083111ae2a11 67 spi_hz = HAL_RCC_GetPCLK1Freq();
saloutos 0:083111ae2a11 68 break;
saloutos 0:083111ae2a11 69 default:
saloutos 0:083111ae2a11 70 error("CLK: SPI instance not set");
saloutos 0:083111ae2a11 71 break;
saloutos 0:083111ae2a11 72 }
saloutos 0:083111ae2a11 73 return spi_hz;
saloutos 0:083111ae2a11 74 }
saloutos 0:083111ae2a11 75
saloutos 0:083111ae2a11 76 #endif