John Karatka / mbed

mbed

Fork of mbed-dev by mbed official

targets/TARGET_STM/TARGET_STM32L0/spi_api.c@182:57724642e740, 2018-02-16 (annotated)

Committer:
AnnaBridge
Date:
Fri Feb 16 16:09:33 2018 +0000
Revision:
182:57724642e740
Parent:
149:156823d33999 
mbed-dev library. Release version 159.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 149:156823d33999 1 /* mbed Microcontroller Library
<> 149:156823d33999 2 *******************************************************************************
<> 149:156823d33999 3 * Copyright (c) 2015, STMicroelectronics
<> 149:156823d33999 4 * All rights reserved.
<> 149:156823d33999 5 *
<> 149:156823d33999 6 * Redistribution and use in source and binary forms, with or without
<> 149:156823d33999 7 * modification, are permitted provided that the following conditions are met:
<> 149:156823d33999 8 *
<> 149:156823d33999 9 * 1. Redistributions of source code must retain the above copyright notice,
<> 149:156823d33999 10 * this list of conditions and the following disclaimer.
<> 149:156823d33999 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 149:156823d33999 12 * this list of conditions and the following disclaimer in the documentation
<> 149:156823d33999 13 * and/or other materials provided with the distribution.
<> 149:156823d33999 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 149:156823d33999 15 * may be used to endorse or promote products derived from this software
<> 149:156823d33999 16 * without specific prior written permission.
<> 149:156823d33999 17 *
<> 149:156823d33999 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 149:156823d33999 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 149:156823d33999 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 149:156823d33999 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 149:156823d33999 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 149:156823d33999 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 149:156823d33999 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 149:156823d33999 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 149:156823d33999 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 149:156823d33999 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 149:156823d33999 28 *******************************************************************************
<> 149:156823d33999 29 */
<> 149:156823d33999 30 #include "mbed_assert.h"
<> 149:156823d33999 31 #include "mbed_error.h"
<> 149:156823d33999 32 #include "spi_api.h"
<> 149:156823d33999 33
<> 149:156823d33999 34 #if DEVICE_SPI
<> 149:156823d33999 35
<> 149:156823d33999 36 #include "cmsis.h"
<> 149:156823d33999 37 #include "pinmap.h"
<> 149:156823d33999 38 #include "mbed_error.h"
<> 149:156823d33999 39 #include "PeripheralPins.h"
<> 149:156823d33999 40
<> 149:156823d33999 41 #if DEVICE_SPI_ASYNCH
<> 149:156823d33999 42 #define SPI_S(obj) (( struct spi_s *)(&(obj->spi)))
<> 149:156823d33999 43 #else
<> 149:156823d33999 44 #define SPI_S(obj) (( struct spi_s *)(obj))
<> 149:156823d33999 45 #endif
<> 149:156823d33999 46
<> 149:156823d33999 47
<> 149:156823d33999 48 /*
<> 149:156823d33999 49 * Only the frequency is managed in the family specific part
<> 149:156823d33999 50 * the rest of SPI management is common to all STM32 families
<> 149:156823d33999 51 */
<> 149:156823d33999 52 int spi_get_clock_freq(spi_t *obj) {
<> 149:156823d33999 53 struct spi_s *spiobj = SPI_S(obj);
<> 149:156823d33999 54 int spi_hz = 0;
<> 149:156823d33999 55
<> 149:156823d33999 56 /* Get source clock depending on SPI instance */
<> 149:156823d33999 57 switch ((int)spiobj->spi) {
<> 149:156823d33999 58 case SPI_1:
<> 149:156823d33999 59 /* SPI_1. Source CLK is PCKL2 */
<> 149:156823d33999 60 spi_hz = HAL_RCC_GetPCLK2Freq();
<> 149:156823d33999 61 break;
<> 149:156823d33999 62 #if defined(SPI2_BASE)
<> 149:156823d33999 63 case SPI_2:
<> 149:156823d33999 64 /* SPI_2. Source CLK is PCKL1 */
<> 149:156823d33999 65 spi_hz = HAL_RCC_GetPCLK1Freq();
<> 149:156823d33999 66 break;
<> 149:156823d33999 67 #endif
<> 149:156823d33999 68 default:
<> 149:156823d33999 69 error("CLK: SPI instance not set");
<> 149:156823d33999 70 break;
<> 149:156823d33999 71 }
<> 149:156823d33999 72 return spi_hz;
<> 149:156823d33999 73 }
<> 149:156823d33999 74
<> 149:156823d33999 75 #endif