mbed official / mbed-src

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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@139:e3413eddde57, 2014-03-27 (annotated)

Committer:
mbed_official
Date:
Thu Mar 27 09:45:07 2014 +0000
Revision:
139:e3413eddde57
Parent:
129:0182c99221bc
Child:
174:8bb9f3a33240
Synchronized with git revision 3d49a491d4dd16466354746d3c329428840f5a03



Full URL: https://github.com/mbedmicro/mbed/commit/3d49a491d4dd16466354746d3c329428840f5a03/



Fixed readNB() bug

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 80:66393a7b209d 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 129:0182c99221bc 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 80:66393a7b209d 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 129:0182c99221bc 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 80:66393a7b209d 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 129:0182c99221bc 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 129:0182c99221bc 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 129:0182c99221bc 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 129:0182c99221bc 84 SPI_InitStructure.SPI_NSS = obj->nss;
mbed_official 129:0182c99221bc 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 129:0182c99221bc 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 76:aeb1df146756 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 76:aeb1df146756 106
mbed_official 76:aeb1df146756 107 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 76:aeb1df146756 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 76:aeb1df146756 112
mbed_official 76:aeb1df146756 113 // Enable SPI clock
mbed_official 76:aeb1df146756 114 if (obj->spi == SPI_1) {
mbed_official 76:aeb1df146756 115 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 76:aeb1df146756 116 }
mbed_official 76:aeb1df146756 117 if (obj->spi == SPI_2) {
mbed_official 76:aeb1df146756 118 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 76:aeb1df146756 119 }
mbed_official 118:b44c45162f28 120 if (obj->spi == SPI_3) {
mbed_official 118:b44c45162f28 121 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
mbed_official 118:b44c45162f28 122 }
mbed_official 76:aeb1df146756 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 76:aeb1df146756 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 76:aeb1df146756 134
mbed_official 76:aeb1df146756 135 if (ssel == NC) { // Master
mbed_official 76:aeb1df146756 136 obj->mode = SPI_Mode_Master;
mbed_official 76:aeb1df146756 137 obj->nss = SPI_NSS_Soft;
mbed_official 76:aeb1df146756 138 }
mbed_official 76:aeb1df146756 139 else { // Slave
mbed_official 76:aeb1df146756 140 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 76:aeb1df146756 141 obj->mode = SPI_Mode_Slave;
mbed_official 76:aeb1df146756 142 obj->nss = SPI_NSS_Soft;
mbed_official 76:aeb1df146756 143 }
mbed_official 76:aeb1df146756 144
mbed_official 76:aeb1df146756 145 init_spi(obj);
mbed_official 76:aeb1df146756 146 }
mbed_official 76:aeb1df146756 147
mbed_official 76:aeb1df146756 148 void spi_free(spi_t *obj) {
mbed_official 76:aeb1df146756 149 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 150 SPI_I2S_DeInit(spi);
mbed_official 76:aeb1df146756 151 }
mbed_official 76:aeb1df146756 152
mbed_official 76:aeb1df146756 153 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 76:aeb1df146756 154 // Save new values
mbed_official 76:aeb1df146756 155 if (bits == 8) {
mbed_official 76:aeb1df146756 156 obj->bits = SPI_DataSize_8b;
mbed_official 76:aeb1df146756 157 }
mbed_official 76:aeb1df146756 158 else {
mbed_official 76:aeb1df146756 159 obj->bits = SPI_DataSize_16b;
mbed_official 76:aeb1df146756 160 }
mbed_official 76:aeb1df146756 161
mbed_official 76:aeb1df146756 162 switch (mode) {
mbed_official 76:aeb1df146756 163 case 0:
mbed_official 76:aeb1df146756 164 obj->cpol = SPI_CPOL_Low;
mbed_official 76:aeb1df146756 165 obj->cpha = SPI_CPHA_1Edge;
mbed_official 76:aeb1df146756 166 break;
mbed_official 76:aeb1df146756 167 case 1:
mbed_official 76:aeb1df146756 168 obj->cpol = SPI_CPOL_Low;
mbed_official 76:aeb1df146756 169 obj->cpha = SPI_CPHA_2Edge;
mbed_official 76:aeb1df146756 170 break;
mbed_official 76:aeb1df146756 171 case 2:
mbed_official 76:aeb1df146756 172 obj->cpol = SPI_CPOL_High;
mbed_official 76:aeb1df146756 173 obj->cpha = SPI_CPHA_1Edge;
mbed_official 76:aeb1df146756 174 break;
mbed_official 76:aeb1df146756 175 default:
mbed_official 76:aeb1df146756 176 obj->cpol = SPI_CPOL_High;
mbed_official 76:aeb1df146756 177 obj->cpha = SPI_CPHA_2Edge;
mbed_official 76:aeb1df146756 178 break;
mbed_official 76:aeb1df146756 179 }
mbed_official 76:aeb1df146756 180
mbed_official 76:aeb1df146756 181 if (slave == 0) {
mbed_official 76:aeb1df146756 182 obj->mode = SPI_Mode_Master;
mbed_official 76:aeb1df146756 183 obj->nss = SPI_NSS_Soft;
mbed_official 76:aeb1df146756 184 }
mbed_official 76:aeb1df146756 185 else {
mbed_official 76:aeb1df146756 186 obj->mode = SPI_Mode_Slave;
mbed_official 76:aeb1df146756 187 obj->nss = SPI_NSS_Hard;
mbed_official 76:aeb1df146756 188 }
mbed_official 76:aeb1df146756 189
mbed_official 76:aeb1df146756 190 init_spi(obj);
mbed_official 76:aeb1df146756 191 }
mbed_official 76:aeb1df146756 192
mbed_official 76:aeb1df146756 193 void spi_frequency(spi_t *obj, int hz) {
mbed_official 139:e3413eddde57 194 // Values depend of PCLK1 and PCLK2: 32 MHz if HSI is used, 24 MHz if HSE is used
mbed_official 139:e3413eddde57 195 if (SystemCoreClock == 32000000) { // HSI
mbed_official 139:e3413eddde57 196 if (hz < 250000) {
mbed_official 139:e3413eddde57 197 obj->br_presc = SPI_BaudRatePrescaler_256; // 125 kHz
mbed_official 139:e3413eddde57 198 }
mbed_official 139:e3413eddde57 199 else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 139:e3413eddde57 200 obj->br_presc = SPI_BaudRatePrescaler_128; // 250 kHz
mbed_official 139:e3413eddde57 201 }
mbed_official 139:e3413eddde57 202 else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 203 obj->br_presc = SPI_BaudRatePrescaler_64; // 500 kHz
mbed_official 139:e3413eddde57 204 }
mbed_official 139:e3413eddde57 205 else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 139:e3413eddde57 206 obj->br_presc = SPI_BaudRatePrescaler_32; // 1 MHz
mbed_official 139:e3413eddde57 207 }
mbed_official 139:e3413eddde57 208 else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 139:e3413eddde57 209 obj->br_presc = SPI_BaudRatePrescaler_16; // 2 MHz
mbed_official 139:e3413eddde57 210 }
mbed_official 139:e3413eddde57 211 else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 139:e3413eddde57 212 obj->br_presc = SPI_BaudRatePrescaler_8; // 4 MHz
mbed_official 139:e3413eddde57 213 }
mbed_official 139:e3413eddde57 214 else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 139:e3413eddde57 215 obj->br_presc = SPI_BaudRatePrescaler_4; // 8 MHz
mbed_official 139:e3413eddde57 216 }
mbed_official 139:e3413eddde57 217 else { // >= 16000000
mbed_official 139:e3413eddde57 218 obj->br_presc = SPI_BaudRatePrescaler_2; // 16 MHz
mbed_official 139:e3413eddde57 219 }
mbed_official 129:0182c99221bc 220 }
mbed_official 139:e3413eddde57 221 else { // 24 MHz - HSE
mbed_official 139:e3413eddde57 222 if (hz < 180000) {
mbed_official 139:e3413eddde57 223 obj->br_presc = SPI_BaudRatePrescaler_256; // 94 kHz
mbed_official 139:e3413eddde57 224 }
mbed_official 139:e3413eddde57 225 else if ((hz >= 180000) && (hz < 350000)) {
mbed_official 139:e3413eddde57 226 obj->br_presc = SPI_BaudRatePrescaler_128; // 188 kHz
mbed_official 139:e3413eddde57 227 }
mbed_official 139:e3413eddde57 228 else if ((hz >= 350000) && (hz < 750000)) {
mbed_official 139:e3413eddde57 229 obj->br_presc = SPI_BaudRatePrescaler_64; // 375 kHz
mbed_official 139:e3413eddde57 230 }
mbed_official 139:e3413eddde57 231 else if ((hz >= 750000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 232 obj->br_presc = SPI_BaudRatePrescaler_32; // 750 kHz
mbed_official 139:e3413eddde57 233 }
mbed_official 139:e3413eddde57 234 else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 139:e3413eddde57 235 obj->br_presc = SPI_BaudRatePrescaler_16; // 1.5 MHz
mbed_official 139:e3413eddde57 236 }
mbed_official 139:e3413eddde57 237 else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 139:e3413eddde57 238 obj->br_presc = SPI_BaudRatePrescaler_8; // 3 MHz
mbed_official 139:e3413eddde57 239 }
mbed_official 139:e3413eddde57 240 else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 139:e3413eddde57 241 obj->br_presc = SPI_BaudRatePrescaler_4; // 6 MHz
mbed_official 139:e3413eddde57 242 }
mbed_official 139:e3413eddde57 243 else { // >= 12000000
mbed_official 139:e3413eddde57 244 obj->br_presc = SPI_BaudRatePrescaler_2; // 12 MHz
mbed_official 139:e3413eddde57 245 }
mbed_official 129:0182c99221bc 246 }
mbed_official 76:aeb1df146756 247 init_spi(obj);
mbed_official 76:aeb1df146756 248 }
mbed_official 76:aeb1df146756 249
mbed_official 76:aeb1df146756 250 static inline int ssp_readable(spi_t *obj) {
mbed_official 76:aeb1df146756 251 int status;
mbed_official 76:aeb1df146756 252 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 253 // Check if data is received
mbed_official 76:aeb1df146756 254 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 255 return status;
mbed_official 76:aeb1df146756 256 }
mbed_official 76:aeb1df146756 257
mbed_official 76:aeb1df146756 258 static inline int ssp_writeable(spi_t *obj) {
mbed_official 76:aeb1df146756 259 int status;
mbed_official 76:aeb1df146756 260 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 261 // Check if data is transmitted
mbed_official 76:aeb1df146756 262 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 263 return status;
mbed_official 76:aeb1df146756 264 }
mbed_official 76:aeb1df146756 265
mbed_official 76:aeb1df146756 266 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 267 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 268 while (!ssp_writeable(obj));
mbed_official 76:aeb1df146756 269 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 76:aeb1df146756 270 }
mbed_official 76:aeb1df146756 271
mbed_official 76:aeb1df146756 272 static inline int ssp_read(spi_t *obj) {
mbed_official 76:aeb1df146756 273 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 274 while (!ssp_readable(obj));
mbed_official 76:aeb1df146756 275 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 76:aeb1df146756 276 }
mbed_official 76:aeb1df146756 277
mbed_official 76:aeb1df146756 278 static inline int ssp_busy(spi_t *obj) {
mbed_official 76:aeb1df146756 279 int status;
mbed_official 76:aeb1df146756 280 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 281 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 282 return status;
mbed_official 76:aeb1df146756 283 }
mbed_official 76:aeb1df146756 284
mbed_official 76:aeb1df146756 285 int spi_master_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 286 ssp_write(obj, value);
mbed_official 76:aeb1df146756 287 return ssp_read(obj);
mbed_official 76:aeb1df146756 288 }
mbed_official 76:aeb1df146756 289
mbed_official 76:aeb1df146756 290 int spi_slave_receive(spi_t *obj) {
mbed_official 76:aeb1df146756 291 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 76:aeb1df146756 292 };
mbed_official 76:aeb1df146756 293
mbed_official 76:aeb1df146756 294 int spi_slave_read(spi_t *obj) {
mbed_official 76:aeb1df146756 295 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 296 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 76:aeb1df146756 297 }
mbed_official 76:aeb1df146756 298
mbed_official 76:aeb1df146756 299 void spi_slave_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 300 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 301 while (!ssp_writeable(obj));
mbed_official 76:aeb1df146756 302 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 76:aeb1df146756 303 }
mbed_official 76:aeb1df146756 304
mbed_official 76:aeb1df146756 305 int spi_busy(spi_t *obj) {
mbed_official 76:aeb1df146756 306 return ssp_busy(obj);
mbed_official 76:aeb1df146756 307 }
mbed_official 76:aeb1df146756 308
mbed_official 76:aeb1df146756 309 #endif