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targets/TARGET_STM/TARGET_STM32L0/spi_api.c@178:c26431f84b0d, 2017-11-09 (annotated)
- Committer:
- amithy
- Date:
- Thu Nov 09 22:14:37 2017 +0000
- Revision:
- 178:c26431f84b0d
- Parent:
- 149:156823d33999
test export
Who changed what in which revision?
User | Revision | Line number | New 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 |