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targets/TARGET_STM/TARGET_STM32L1/spi_api.c@189:f392fc9709a3, 2019-02-20 (annotated)

Committer:
AnnaBridge
Date:
Wed Feb 20 22:31:08 2019 +0000
Revision:
189:f392fc9709a3
Parent:
187:0387e8f68319 
mbed library release version 165

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) 2014, 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 "PeripheralPins.h"
<> 149:156823d33999 39
<> 149:156823d33999 40
<> 149:156823d33999 41 #if DEVICE_SPI_ASYNCH
AnnaBridge 187:0387e8f68319 42 #define SPI_S(obj) (( struct spi_s *)(&(obj->spi)))
<> 149:156823d33999 43 #else
AnnaBridge 187:0387e8f68319 44 #define SPI_S(obj) (( struct spi_s *)(obj))
<> 149:156823d33999 45 #endif
<> 149:156823d33999 46
<> 149:156823d33999 47 /*
<> 149:156823d33999 48 * Only the frequency is managed in the family specific part
<> 149:156823d33999 49 * the rest of SPI management is common to all STM32 families
<> 149:156823d33999 50 */
AnnaBridge 187:0387e8f68319 51 int spi_get_clock_freq(spi_t *obj)
AnnaBridge 187:0387e8f68319 52 {
<> 149:156823d33999 53 struct spi_s *spiobj = SPI_S(obj);
AnnaBridge 187:0387e8f68319 54 int spi_hz = 0;
<> 149:156823d33999 55
AnnaBridge 187:0387e8f68319 56 /* Get source clock depending on SPI instance */
<> 149:156823d33999 57 switch ((int)spiobj->spi) {
<> 149:156823d33999 58 case SPI_1:
AnnaBridge 187:0387e8f68319 59 /* SPI_1. Source CLK is PCKL2 */
AnnaBridge 187:0387e8f68319 60 spi_hz = HAL_RCC_GetPCLK2Freq();
AnnaBridge 187:0387e8f68319 61 break;
AnnaBridge 187:0387e8f68319 62 case SPI_2:
AnnaBridge 184:08ed48f1de7f 63 #ifdef SPI_3
AnnaBridge 184:08ed48f1de7f 64 case SPI_3:
AnnaBridge 184:08ed48f1de7f 65 #endif
AnnaBridge 187:0387e8f68319 66 /* SPI_2, SPI_3. Source CLK is PCKL1 */
AnnaBridge 187:0387e8f68319 67 spi_hz = HAL_RCC_GetPCLK1Freq();
AnnaBridge 187:0387e8f68319 68 break;
AnnaBridge 187:0387e8f68319 69 default:
AnnaBridge 187:0387e8f68319 70 error("CLK: SPI instance not set");
<> 149:156823d33999 71 break;
<> 149:156823d33999 72 }
<> 149:156823d33999 73 return spi_hz;
<> 149:156823d33999 74 }
<> 149:156823d33999 75
<> 149:156823d33999 76 #endif