Gan likun / mbed-dev

00

targets/TARGET_STM/TARGET_STM32F4/spi_api.c@0:13413ea9a877, 2022-06-12 (annotated)

Committer:
ganlikun
Date:
Sun Jun 12 14:02:44 2022 +0000
Revision:
0:13413ea9a877
00

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ganlikun 0:13413ea9a877 1 /* mbed Microcontroller Library
ganlikun 0:13413ea9a877 2 *******************************************************************************
ganlikun 0:13413ea9a877 3 * Copyright (c) 2015, STMicroelectronics
ganlikun 0:13413ea9a877 4 * All rights reserved.
ganlikun 0:13413ea9a877 5 *
ganlikun 0:13413ea9a877 6 * Redistribution and use in source and binary forms, with or without
ganlikun 0:13413ea9a877 7 * modification, are permitted provided that the following conditions are met:
ganlikun 0:13413ea9a877 8 *
ganlikun 0:13413ea9a877 9 * 1. Redistributions of source code must retain the above copyright notice,
ganlikun 0:13413ea9a877 10 * this list of conditions and the following disclaimer.
ganlikun 0:13413ea9a877 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
ganlikun 0:13413ea9a877 12 * this list of conditions and the following disclaimer in the documentation
ganlikun 0:13413ea9a877 13 * and/or other materials provided with the distribution.
ganlikun 0:13413ea9a877 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
ganlikun 0:13413ea9a877 15 * may be used to endorse or promote products derived from this software
ganlikun 0:13413ea9a877 16 * without specific prior written permission.
ganlikun 0:13413ea9a877 17 *
ganlikun 0:13413ea9a877 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
ganlikun 0:13413ea9a877 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ganlikun 0:13413ea9a877 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
ganlikun 0:13413ea9a877 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
ganlikun 0:13413ea9a877 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
ganlikun 0:13413ea9a877 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
ganlikun 0:13413ea9a877 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
ganlikun 0:13413ea9a877 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
ganlikun 0:13413ea9a877 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
ganlikun 0:13413ea9a877 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
ganlikun 0:13413ea9a877 28 *******************************************************************************
ganlikun 0:13413ea9a877 29 */
ganlikun 0:13413ea9a877 30 #include "mbed_assert.h"
ganlikun 0:13413ea9a877 31 #include "mbed_error.h"
ganlikun 0:13413ea9a877 32 #include "spi_api.h"
ganlikun 0:13413ea9a877 33
ganlikun 0:13413ea9a877 34 #if DEVICE_SPI
ganlikun 0:13413ea9a877 35 #include <stdbool.h>
ganlikun 0:13413ea9a877 36 #include <math.h>
ganlikun 0:13413ea9a877 37 #include <string.h>
ganlikun 0:13413ea9a877 38 #include "cmsis.h"
ganlikun 0:13413ea9a877 39 #include "pinmap.h"
ganlikun 0:13413ea9a877 40 #include "PeripheralPins.h"
ganlikun 0:13413ea9a877 41
ganlikun 0:13413ea9a877 42 #if DEVICE_SPI_ASYNCH
ganlikun 0:13413ea9a877 43 #define SPI_S(obj) (( struct spi_s *)(&(obj->spi)))
ganlikun 0:13413ea9a877 44 #else
ganlikun 0:13413ea9a877 45 #define SPI_S(obj) (( struct spi_s *)(obj))
ganlikun 0:13413ea9a877 46 #endif
ganlikun 0:13413ea9a877 47
ganlikun 0:13413ea9a877 48 /*
ganlikun 0:13413ea9a877 49 * Only the frequency is managed in the family specific part
ganlikun 0:13413ea9a877 50 * the rest of SPI management is common to all STM32 families
ganlikun 0:13413ea9a877 51 */
ganlikun 0:13413ea9a877 52 int spi_get_clock_freq(spi_t *obj) {
ganlikun 0:13413ea9a877 53 struct spi_s *spiobj = SPI_S(obj);
ganlikun 0:13413ea9a877 54 int spi_hz = 0;
ganlikun 0:13413ea9a877 55
ganlikun 0:13413ea9a877 56 /* Get source clock depending on SPI instance */
ganlikun 0:13413ea9a877 57 switch ((int)spiobj->spi) {
ganlikun 0:13413ea9a877 58 case SPI_1:
ganlikun 0:13413ea9a877 59 #if defined SPI4_BASE
ganlikun 0:13413ea9a877 60 case SPI_4:
ganlikun 0:13413ea9a877 61 #endif
ganlikun 0:13413ea9a877 62 #if defined SPI5_BASE
ganlikun 0:13413ea9a877 63 case SPI_5:
ganlikun 0:13413ea9a877 64 #endif
ganlikun 0:13413ea9a877 65 #if defined SPI6_BASE
ganlikun 0:13413ea9a877 66 case SPI_6:
ganlikun 0:13413ea9a877 67 #endif
ganlikun 0:13413ea9a877 68 /* SPI_1, SPI_4, SPI_5 and SPI_6. Source CLK is PCKL2 */
ganlikun 0:13413ea9a877 69 spi_hz = HAL_RCC_GetPCLK2Freq();
ganlikun 0:13413ea9a877 70 break;
ganlikun 0:13413ea9a877 71 case SPI_2:
ganlikun 0:13413ea9a877 72 #if defined SPI3_BASE
ganlikun 0:13413ea9a877 73 case SPI_3:
ganlikun 0:13413ea9a877 74 #endif
ganlikun 0:13413ea9a877 75 /* SPI_2 and SPI_3. Source CLK is PCKL1 */
ganlikun 0:13413ea9a877 76 spi_hz = HAL_RCC_GetPCLK1Freq();
ganlikun 0:13413ea9a877 77 break;
ganlikun 0:13413ea9a877 78 default:
ganlikun 0:13413ea9a877 79 error("CLK: SPI instance not set");
ganlikun 0:13413ea9a877 80 break;
ganlikun 0:13413ea9a877 81 }
ganlikun 0:13413ea9a877 82 return spi_hz;
ganlikun 0:13413ea9a877 83 }
ganlikun 0:13413ea9a877 84
ganlikun 0:13413ea9a877 85 #endif
ganlikun 0:13413ea9a877 86