EL4121 Embedded System / mbed-os

mbed-os

Dependents:   cobaLCDJoyMotor_Thread odometry_omni_3roda_v3 odometry_omni_3roda_v1 odometry_omni_3roda_v2 ... more

targets/TARGET_STM/TARGET_STM32F7/spi_api.c@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /* mbed Microcontroller Library
be_bryan 0:b74591d5ab33 2 *******************************************************************************
be_bryan 0:b74591d5ab33 3 * Copyright (c) 2015, STMicroelectronics
be_bryan 0:b74591d5ab33 4 * All rights reserved.
be_bryan 0:b74591d5ab33 5 *
be_bryan 0:b74591d5ab33 6 * Redistribution and use in source and binary forms, with or without
be_bryan 0:b74591d5ab33 7 * modification, are permitted provided that the following conditions are met:
be_bryan 0:b74591d5ab33 8 *
be_bryan 0:b74591d5ab33 9 * 1. Redistributions of source code must retain the above copyright notice,
be_bryan 0:b74591d5ab33 10 * this list of conditions and the following disclaimer.
be_bryan 0:b74591d5ab33 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
be_bryan 0:b74591d5ab33 12 * this list of conditions and the following disclaimer in the documentation
be_bryan 0:b74591d5ab33 13 * and/or other materials provided with the distribution.
be_bryan 0:b74591d5ab33 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
be_bryan 0:b74591d5ab33 15 * may be used to endorse or promote products derived from this software
be_bryan 0:b74591d5ab33 16 * without specific prior written permission.
be_bryan 0:b74591d5ab33 17 *
be_bryan 0:b74591d5ab33 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
be_bryan 0:b74591d5ab33 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
be_bryan 0:b74591d5ab33 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
be_bryan 0:b74591d5ab33 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
be_bryan 0:b74591d5ab33 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
be_bryan 0:b74591d5ab33 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
be_bryan 0:b74591d5ab33 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
be_bryan 0:b74591d5ab33 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
be_bryan 0:b74591d5ab33 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
be_bryan 0:b74591d5ab33 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
be_bryan 0:b74591d5ab33 28 *******************************************************************************
be_bryan 0:b74591d5ab33 29 */
be_bryan 0:b74591d5ab33 30 #include "mbed_assert.h"
be_bryan 0:b74591d5ab33 31 #include "mbed_error.h"
be_bryan 0:b74591d5ab33 32 #include "spi_api.h"
be_bryan 0:b74591d5ab33 33
be_bryan 0:b74591d5ab33 34 #if DEVICE_SPI
be_bryan 0:b74591d5ab33 35
be_bryan 0:b74591d5ab33 36 #include "cmsis.h"
be_bryan 0:b74591d5ab33 37 #include "pinmap.h"
be_bryan 0:b74591d5ab33 38 #include "PeripheralPins.h"
be_bryan 0:b74591d5ab33 39 #include "mbed_error.h"
be_bryan 0:b74591d5ab33 40
be_bryan 0:b74591d5ab33 41 #if DEVICE_SPI_ASYNCH
be_bryan 0:b74591d5ab33 42 #define SPI_S(obj) (( struct spi_s *)(&(obj->spi)))
be_bryan 0:b74591d5ab33 43 #else
be_bryan 0:b74591d5ab33 44 #define SPI_S(obj) (( struct spi_s *)(obj))
be_bryan 0:b74591d5ab33 45 #endif
be_bryan 0:b74591d5ab33 46
be_bryan 0:b74591d5ab33 47 /*
be_bryan 0:b74591d5ab33 48 * Only the frequency is managed in the family specific part
be_bryan 0:b74591d5ab33 49 * the rest of SPI management is common to all STM32 families
be_bryan 0:b74591d5ab33 50 */
be_bryan 0:b74591d5ab33 51 int spi_get_clock_freq(spi_t *obj) {
be_bryan 0:b74591d5ab33 52 struct spi_s *spiobj = SPI_S(obj);
be_bryan 0:b74591d5ab33 53 int spi_hz = 0;
be_bryan 0:b74591d5ab33 54
be_bryan 0:b74591d5ab33 55 /* Get source clock depending on SPI instance */
be_bryan 0:b74591d5ab33 56 switch ((int)spiobj->spi) {
be_bryan 0:b74591d5ab33 57 case SPI_1:
be_bryan 0:b74591d5ab33 58 case SPI_4:
be_bryan 0:b74591d5ab33 59 case SPI_5:
be_bryan 0:b74591d5ab33 60 case SPI_6:
be_bryan 0:b74591d5ab33 61 /* SPI_1, SPI_4, SPI_5 and SPI_6. Source CLK is PCKL2 */
be_bryan 0:b74591d5ab33 62 spi_hz = HAL_RCC_GetPCLK2Freq();
be_bryan 0:b74591d5ab33 63 break;
be_bryan 0:b74591d5ab33 64 case SPI_2:
be_bryan 0:b74591d5ab33 65 case SPI_3:
be_bryan 0:b74591d5ab33 66 /* SPI_2 and SPI_3. Source CLK is PCKL1 */
be_bryan 0:b74591d5ab33 67 spi_hz = HAL_RCC_GetPCLK1Freq();
be_bryan 0:b74591d5ab33 68 break;
be_bryan 0:b74591d5ab33 69 default:
be_bryan 0:b74591d5ab33 70 error("CLK: SPI instance not set");
be_bryan 0:b74591d5ab33 71 break;
be_bryan 0:b74591d5ab33 72 }
be_bryan 0:b74591d5ab33 73 return spi_hz;
be_bryan 0:b74591d5ab33 74 }
be_bryan 0:b74591d5ab33 75
be_bryan 0:b74591d5ab33 76 #endif