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mbed library sources

Dependents:   Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more

Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/spi_api.c@215:83cf97a28428, 2014-05-27 (annotated)

Committer:
mbed_official
Date:
Tue May 27 08:30:06 2014 +0100
Revision:
215:83cf97a28428
Parent:
190:bde2479eef9e
Child:
227:7bd0639b8911
Synchronized with git revision a8b7f5df2cb5d7a76fda549a15b91fdaba6e2986



Full URL: https://github.com/mbedmicro/mbed/commit/a8b7f5df2cb5d7a76fda549a15b91fdaba6e2986/



[KLXX] Added RPC + RTOS support (KL05Z)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 76:aeb1df146756 1 /* mbed Microcontroller Library
mbed_official 76:aeb1df146756 2 *******************************************************************************
mbed_official 76:aeb1df146756 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 76:aeb1df146756 4 * All rights reserved.
mbed_official 76:aeb1df146756 5 *
mbed_official 76:aeb1df146756 6 * Redistribution and use in source and binary forms, with or without
mbed_official 76:aeb1df146756 7 * modification, are permitted provided that the following conditions are met:
mbed_official 76:aeb1df146756 8 *
mbed_official 76:aeb1df146756 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 76:aeb1df146756 10 * this list of conditions and the following disclaimer.
mbed_official 76:aeb1df146756 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 76:aeb1df146756 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 76:aeb1df146756 13 * and/or other materials provided with the distribution.
mbed_official 76:aeb1df146756 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 76:aeb1df146756 15 * may be used to endorse or promote products derived from this software
mbed_official 76:aeb1df146756 16 * without specific prior written permission.
mbed_official 76:aeb1df146756 17 *
mbed_official 76:aeb1df146756 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 76:aeb1df146756 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 76:aeb1df146756 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 76:aeb1df146756 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 76:aeb1df146756 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 76:aeb1df146756 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 76:aeb1df146756 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 76:aeb1df146756 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 76:aeb1df146756 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 76:aeb1df146756 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 76:aeb1df146756 28 *******************************************************************************
mbed_official 76:aeb1df146756 29 */
mbed_official 76:aeb1df146756 30 #include "spi_api.h"
mbed_official 76:aeb1df146756 31
mbed_official 76:aeb1df146756 32 #if DEVICE_SPI
mbed_official 76:aeb1df146756 33
mbed_official 76:aeb1df146756 34 #include <math.h>
mbed_official 76:aeb1df146756 35 #include "cmsis.h"
mbed_official 76:aeb1df146756 36 #include "pinmap.h"
mbed_official 76:aeb1df146756 37 #include "error.h"
mbed_official 76:aeb1df146756 38
mbed_official 76:aeb1df146756 39 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 174:8bb9f3a33240 40 {PA_7, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 41 {PA_12, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 42 {PB_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 174:8bb9f3a33240 43 // {PB_5, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 129:0182c99221bc 44 {PB_15, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 129:0182c99221bc 45 {PC_12, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 76:aeb1df146756 46 {NC, NC, 0}
mbed_official 76:aeb1df146756 47 };
mbed_official 76:aeb1df146756 48
mbed_official 76:aeb1df146756 49 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 174:8bb9f3a33240 50 {PA_6, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 51 {PA_11, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 52 {PB_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 174:8bb9f3a33240 53 // {PB_4, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 118:b44c45162f28 54 {PB_14, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 118:b44c45162f28 55 {PC_11, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 76:aeb1df146756 56 {NC, NC, 0}
mbed_official 76:aeb1df146756 57 };
mbed_official 76:aeb1df146756 58
mbed_official 76:aeb1df146756 59 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 174:8bb9f3a33240 60 {PA_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 61 {PB_3, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 174:8bb9f3a33240 62 // {PB_3, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 118:b44c45162f28 63 {PB_13, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 118:b44c45162f28 64 {PC_10, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 76:aeb1df146756 65 {NC, NC, 0}
mbed_official 76:aeb1df146756 66 };
mbed_official 76:aeb1df146756 67
mbed_official 76:aeb1df146756 68 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 129:0182c99221bc 69 {PA_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 174:8bb9f3a33240 70 // {PA_4, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 129:0182c99221bc 71 {PA_15, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 174:8bb9f3a33240 72 // {PA_15, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 118:b44c45162f28 73 {PB_12, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 76:aeb1df146756 74 {NC, NC, 0}
mbed_official 76:aeb1df146756 75 };
mbed_official 76:aeb1df146756 76
mbed_official 76:aeb1df146756 77 static void init_spi(spi_t *obj) {
mbed_official 76:aeb1df146756 78 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 79 SPI_InitTypeDef SPI_InitStructure;
mbed_official 76:aeb1df146756 80
mbed_official 76:aeb1df146756 81 SPI_Cmd(spi, DISABLE);
mbed_official 76:aeb1df146756 82
mbed_official 129:0182c99221bc 83 SPI_InitStructure.SPI_Mode = obj->mode;
mbed_official 174:8bb9f3a33240 84 SPI_InitStructure.SPI_NSS = obj->nss;
mbed_official 174:8bb9f3a33240 85 SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
mbed_official 129:0182c99221bc 86 SPI_InitStructure.SPI_DataSize = obj->bits;
mbed_official 129:0182c99221bc 87 SPI_InitStructure.SPI_CPOL = obj->cpol;
mbed_official 174:8bb9f3a33240 88 SPI_InitStructure.SPI_CPHA = obj->cpha;
mbed_official 76:aeb1df146756 89 SPI_InitStructure.SPI_BaudRatePrescaler = obj->br_presc;
mbed_official 129:0182c99221bc 90 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
mbed_official 129:0182c99221bc 91 SPI_InitStructure.SPI_CRCPolynomial = 7;
mbed_official 76:aeb1df146756 92 SPI_Init(spi, &SPI_InitStructure);
mbed_official 76:aeb1df146756 93
mbed_official 76:aeb1df146756 94 SPI_Cmd(spi, ENABLE);
mbed_official 76:aeb1df146756 95 }
mbed_official 76:aeb1df146756 96
mbed_official 76:aeb1df146756 97 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 76:aeb1df146756 98 // Determine the SPI to use
mbed_official 76:aeb1df146756 99 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 76:aeb1df146756 100 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 76:aeb1df146756 101 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 76:aeb1df146756 102 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 174:8bb9f3a33240 103
mbed_official 76:aeb1df146756 104 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 76:aeb1df146756 105 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 174:8bb9f3a33240 106
mbed_official 76:aeb1df146756 107 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 174:8bb9f3a33240 108
mbed_official 76:aeb1df146756 109 if (obj->spi == (SPIName)NC) {
mbed_official 76:aeb1df146756 110 error("SPI pinout mapping failed");
mbed_official 76:aeb1df146756 111 }
mbed_official 174:8bb9f3a33240 112
mbed_official 76:aeb1df146756 113 // Enable SPI clock
mbed_official 76:aeb1df146756 114 if (obj->spi == SPI_1) {
mbed_official 174:8bb9f3a33240 115 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 76:aeb1df146756 116 }
mbed_official 76:aeb1df146756 117 if (obj->spi == SPI_2) {
mbed_official 174:8bb9f3a33240 118 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 76:aeb1df146756 119 }
mbed_official 118:b44c45162f28 120 if (obj->spi == SPI_3) {
mbed_official 174:8bb9f3a33240 121 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
mbed_official 118:b44c45162f28 122 }
mbed_official 174:8bb9f3a33240 123
mbed_official 76:aeb1df146756 124 // Configure the SPI pins
mbed_official 76:aeb1df146756 125 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 76:aeb1df146756 126 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 76:aeb1df146756 127 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 174:8bb9f3a33240 128
mbed_official 76:aeb1df146756 129 // Save new values
mbed_official 76:aeb1df146756 130 obj->bits = SPI_DataSize_8b;
mbed_official 76:aeb1df146756 131 obj->cpol = SPI_CPOL_Low;
mbed_official 76:aeb1df146756 132 obj->cpha = SPI_CPHA_1Edge;
mbed_official 129:0182c99221bc 133 obj->br_presc = SPI_BaudRatePrescaler_256;
mbed_official 174:8bb9f3a33240 134
mbed_official 215:83cf97a28428 135 obj->pin_miso = miso;
mbed_official 215:83cf97a28428 136 obj->pin_mosi = mosi;
mbed_official 215:83cf97a28428 137 obj->pin_sclk = sclk;
mbed_official 215:83cf97a28428 138 obj->pin_ssel = ssel;
mbed_official 215:83cf97a28428 139
mbed_official 76:aeb1df146756 140 if (ssel == NC) { // Master
mbed_official 76:aeb1df146756 141 obj->mode = SPI_Mode_Master;
mbed_official 76:aeb1df146756 142 obj->nss = SPI_NSS_Soft;
mbed_official 174:8bb9f3a33240 143 } else { // Slave
mbed_official 76:aeb1df146756 144 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 76:aeb1df146756 145 obj->mode = SPI_Mode_Slave;
mbed_official 190:bde2479eef9e 146 obj->nss = SPI_NSS_Hard;
mbed_official 76:aeb1df146756 147 }
mbed_official 76:aeb1df146756 148
mbed_official 76:aeb1df146756 149 init_spi(obj);
mbed_official 76:aeb1df146756 150 }
mbed_official 76:aeb1df146756 151
mbed_official 76:aeb1df146756 152 void spi_free(spi_t *obj) {
mbed_official 215:83cf97a28428 153 // Reset SPI and disable clock
mbed_official 215:83cf97a28428 154 if (obj->spi == SPI_1) {
mbed_official 215:83cf97a28428 155 RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 215:83cf97a28428 156 RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, DISABLE);
mbed_official 215:83cf97a28428 157 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, DISABLE);
mbed_official 215:83cf97a28428 158 }
mbed_official 215:83cf97a28428 159
mbed_official 215:83cf97a28428 160 if (obj->spi == SPI_2) {
mbed_official 215:83cf97a28428 161 RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 215:83cf97a28428 162 RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, DISABLE);
mbed_official 215:83cf97a28428 163 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, DISABLE);
mbed_official 215:83cf97a28428 164 }
mbed_official 215:83cf97a28428 165
mbed_official 215:83cf97a28428 166 if (obj->spi == SPI_3) {
mbed_official 215:83cf97a28428 167 RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, ENABLE);
mbed_official 215:83cf97a28428 168 RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, DISABLE);
mbed_official 215:83cf97a28428 169 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, DISABLE);
mbed_official 215:83cf97a28428 170 }
mbed_official 215:83cf97a28428 171
mbed_official 215:83cf97a28428 172 // Configure GPIOs
mbed_official 215:83cf97a28428 173 pin_function(obj->pin_miso, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF));
mbed_official 215:83cf97a28428 174 pin_function(obj->pin_mosi, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF));
mbed_official 215:83cf97a28428 175 pin_function(obj->pin_sclk, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF));
mbed_official 215:83cf97a28428 176 pin_function(obj->pin_ssel, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF));
mbed_official 76:aeb1df146756 177 }
mbed_official 76:aeb1df146756 178
mbed_official 174:8bb9f3a33240 179 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 76:aeb1df146756 180 // Save new values
mbed_official 76:aeb1df146756 181 if (bits == 8) {
mbed_official 76:aeb1df146756 182 obj->bits = SPI_DataSize_8b;
mbed_official 174:8bb9f3a33240 183 } else {
mbed_official 76:aeb1df146756 184 obj->bits = SPI_DataSize_16b;
mbed_official 76:aeb1df146756 185 }
mbed_official 174:8bb9f3a33240 186
mbed_official 76:aeb1df146756 187 switch (mode) {
mbed_official 76:aeb1df146756 188 case 0:
mbed_official 174:8bb9f3a33240 189 obj->cpol = SPI_CPOL_Low;
mbed_official 174:8bb9f3a33240 190 obj->cpha = SPI_CPHA_1Edge;
mbed_official 174:8bb9f3a33240 191 break;
mbed_official 76:aeb1df146756 192 case 1:
mbed_official 174:8bb9f3a33240 193 obj->cpol = SPI_CPOL_Low;
mbed_official 174:8bb9f3a33240 194 obj->cpha = SPI_CPHA_2Edge;
mbed_official 174:8bb9f3a33240 195 break;
mbed_official 76:aeb1df146756 196 case 2:
mbed_official 174:8bb9f3a33240 197 obj->cpol = SPI_CPOL_High;
mbed_official 174:8bb9f3a33240 198 obj->cpha = SPI_CPHA_1Edge;
mbed_official 174:8bb9f3a33240 199 break;
mbed_official 76:aeb1df146756 200 default:
mbed_official 174:8bb9f3a33240 201 obj->cpol = SPI_CPOL_High;
mbed_official 174:8bb9f3a33240 202 obj->cpha = SPI_CPHA_2Edge;
mbed_official 174:8bb9f3a33240 203 break;
mbed_official 76:aeb1df146756 204 }
mbed_official 174:8bb9f3a33240 205
mbed_official 76:aeb1df146756 206 if (slave == 0) {
mbed_official 76:aeb1df146756 207 obj->mode = SPI_Mode_Master;
mbed_official 76:aeb1df146756 208 obj->nss = SPI_NSS_Soft;
mbed_official 174:8bb9f3a33240 209 } else {
mbed_official 76:aeb1df146756 210 obj->mode = SPI_Mode_Slave;
mbed_official 174:8bb9f3a33240 211 obj->nss = SPI_NSS_Hard;
mbed_official 76:aeb1df146756 212 }
mbed_official 174:8bb9f3a33240 213
mbed_official 76:aeb1df146756 214 init_spi(obj);
mbed_official 76:aeb1df146756 215 }
mbed_official 76:aeb1df146756 216
mbed_official 76:aeb1df146756 217 void spi_frequency(spi_t *obj, int hz) {
mbed_official 139:e3413eddde57 218 // Values depend of PCLK1 and PCLK2: 32 MHz if HSI is used, 24 MHz if HSE is used
mbed_official 139:e3413eddde57 219 if (SystemCoreClock == 32000000) { // HSI
mbed_official 139:e3413eddde57 220 if (hz < 250000) {
mbed_official 139:e3413eddde57 221 obj->br_presc = SPI_BaudRatePrescaler_256; // 125 kHz
mbed_official 174:8bb9f3a33240 222 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 139:e3413eddde57 223 obj->br_presc = SPI_BaudRatePrescaler_128; // 250 kHz
mbed_official 174:8bb9f3a33240 224 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 225 obj->br_presc = SPI_BaudRatePrescaler_64; // 500 kHz
mbed_official 174:8bb9f3a33240 226 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 139:e3413eddde57 227 obj->br_presc = SPI_BaudRatePrescaler_32; // 1 MHz
mbed_official 174:8bb9f3a33240 228 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 139:e3413eddde57 229 obj->br_presc = SPI_BaudRatePrescaler_16; // 2 MHz
mbed_official 174:8bb9f3a33240 230 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 139:e3413eddde57 231 obj->br_presc = SPI_BaudRatePrescaler_8; // 4 MHz
mbed_official 174:8bb9f3a33240 232 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 139:e3413eddde57 233 obj->br_presc = SPI_BaudRatePrescaler_4; // 8 MHz
mbed_official 174:8bb9f3a33240 234 } else { // >= 16000000
mbed_official 139:e3413eddde57 235 obj->br_presc = SPI_BaudRatePrescaler_2; // 16 MHz
mbed_official 139:e3413eddde57 236 }
mbed_official 174:8bb9f3a33240 237 } else { // 24 MHz - HSE
mbed_official 139:e3413eddde57 238 if (hz < 180000) {
mbed_official 139:e3413eddde57 239 obj->br_presc = SPI_BaudRatePrescaler_256; // 94 kHz
mbed_official 174:8bb9f3a33240 240 } else if ((hz >= 180000) && (hz < 350000)) {
mbed_official 139:e3413eddde57 241 obj->br_presc = SPI_BaudRatePrescaler_128; // 188 kHz
mbed_official 174:8bb9f3a33240 242 } else if ((hz >= 350000) && (hz < 750000)) {
mbed_official 139:e3413eddde57 243 obj->br_presc = SPI_BaudRatePrescaler_64; // 375 kHz
mbed_official 174:8bb9f3a33240 244 } else if ((hz >= 750000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 245 obj->br_presc = SPI_BaudRatePrescaler_32; // 750 kHz
mbed_official 174:8bb9f3a33240 246 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 174:8bb9f3a33240 247 obj->br_presc = SPI_BaudRatePrescaler_16; // 1.5 MHz
mbed_official 174:8bb9f3a33240 248 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 174:8bb9f3a33240 249 obj->br_presc = SPI_BaudRatePrescaler_8; // 3 MHz
mbed_official 174:8bb9f3a33240 250 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 174:8bb9f3a33240 251 obj->br_presc = SPI_BaudRatePrescaler_4; // 6 MHz
mbed_official 174:8bb9f3a33240 252 } else { // >= 12000000
mbed_official 174:8bb9f3a33240 253 obj->br_presc = SPI_BaudRatePrescaler_2; // 12 MHz
mbed_official 139:e3413eddde57 254 }
mbed_official 129:0182c99221bc 255 }
mbed_official 76:aeb1df146756 256 init_spi(obj);
mbed_official 76:aeb1df146756 257 }
mbed_official 76:aeb1df146756 258
mbed_official 76:aeb1df146756 259 static inline int ssp_readable(spi_t *obj) {
mbed_official 76:aeb1df146756 260 int status;
mbed_official 76:aeb1df146756 261 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 262 // Check if data is received
mbed_official 76:aeb1df146756 263 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 174:8bb9f3a33240 264 return status;
mbed_official 76:aeb1df146756 265 }
mbed_official 76:aeb1df146756 266
mbed_official 76:aeb1df146756 267 static inline int ssp_writeable(spi_t *obj) {
mbed_official 76:aeb1df146756 268 int status;
mbed_official 76:aeb1df146756 269 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 270 // Check if data is transmitted
mbed_official 76:aeb1df146756 271 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 272 return status;
mbed_official 76:aeb1df146756 273 }
mbed_official 76:aeb1df146756 274
mbed_official 76:aeb1df146756 275 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 174:8bb9f3a33240 276 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 277 while (!ssp_writeable(obj));
mbed_official 76:aeb1df146756 278 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 76:aeb1df146756 279 }
mbed_official 76:aeb1df146756 280
mbed_official 76:aeb1df146756 281 static inline int ssp_read(spi_t *obj) {
mbed_official 174:8bb9f3a33240 282 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 283 while (!ssp_readable(obj));
mbed_official 76:aeb1df146756 284 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 76:aeb1df146756 285 }
mbed_official 76:aeb1df146756 286
mbed_official 76:aeb1df146756 287 static inline int ssp_busy(spi_t *obj) {
mbed_official 76:aeb1df146756 288 int status;
mbed_official 76:aeb1df146756 289 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 290 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 291 return status;
mbed_official 76:aeb1df146756 292 }
mbed_official 76:aeb1df146756 293
mbed_official 76:aeb1df146756 294 int spi_master_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 295 ssp_write(obj, value);
mbed_official 76:aeb1df146756 296 return ssp_read(obj);
mbed_official 76:aeb1df146756 297 }
mbed_official 76:aeb1df146756 298
mbed_official 76:aeb1df146756 299 int spi_slave_receive(spi_t *obj) {
mbed_official 190:bde2479eef9e 300 //return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0); // initial code
mbed_official 190:bde2479eef9e 301 return (ssp_readable(obj)) ? (1) : (0); // works better like this
mbed_official 76:aeb1df146756 302 };
mbed_official 76:aeb1df146756 303
mbed_official 76:aeb1df146756 304 int spi_slave_read(spi_t *obj) {
mbed_official 76:aeb1df146756 305 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 306 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 76:aeb1df146756 307 }
mbed_official 76:aeb1df146756 308
mbed_official 76:aeb1df146756 309 void spi_slave_write(spi_t *obj, int value) {
mbed_official 174:8bb9f3a33240 310 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 174:8bb9f3a33240 311 while (!ssp_writeable(obj));
mbed_official 76:aeb1df146756 312 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 76:aeb1df146756 313 }
mbed_official 76:aeb1df146756 314
mbed_official 76:aeb1df146756 315 int spi_busy(spi_t *obj) {
mbed_official 76:aeb1df146756 316 return ssp_busy(obj);
mbed_official 76:aeb1df146756 317 }
mbed_official 76:aeb1df146756 318
mbed_official 76:aeb1df146756 319 #endif