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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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

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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@177:d57c40a064c8, 2014-05-01 (annotated)

Committer:
mbed_official
Date:
Thu May 01 13:00:08 2014 +0100
Revision:
177:d57c40a064c8
Parent:
174:8bb9f3a33240
Child:
190:bde2479eef9e
Synchronized with git revision 60b6b2c007da93422c82ac43775895d0314c00d8



Full URL: https://github.com/mbedmicro/mbed/commit/60b6b2c007da93422c82ac43775895d0314c00d8/



Update with I2C fix

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 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 174:8bb9f3a33240 138 } else { // Slave
mbed_official 76:aeb1df146756 139 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 76:aeb1df146756 140 obj->mode = SPI_Mode_Slave;
mbed_official 76:aeb1df146756 141 obj->nss = SPI_NSS_Soft;
mbed_official 76:aeb1df146756 142 }
mbed_official 76:aeb1df146756 143
mbed_official 76:aeb1df146756 144 init_spi(obj);
mbed_official 76:aeb1df146756 145 }
mbed_official 76:aeb1df146756 146
mbed_official 76:aeb1df146756 147 void spi_free(spi_t *obj) {
mbed_official 76:aeb1df146756 148 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 149 SPI_I2S_DeInit(spi);
mbed_official 76:aeb1df146756 150 }
mbed_official 76:aeb1df146756 151
mbed_official 174:8bb9f3a33240 152 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 76:aeb1df146756 153 // Save new values
mbed_official 76:aeb1df146756 154 if (bits == 8) {
mbed_official 76:aeb1df146756 155 obj->bits = SPI_DataSize_8b;
mbed_official 174:8bb9f3a33240 156 } else {
mbed_official 76:aeb1df146756 157 obj->bits = SPI_DataSize_16b;
mbed_official 76:aeb1df146756 158 }
mbed_official 174:8bb9f3a33240 159
mbed_official 76:aeb1df146756 160 switch (mode) {
mbed_official 76:aeb1df146756 161 case 0:
mbed_official 174:8bb9f3a33240 162 obj->cpol = SPI_CPOL_Low;
mbed_official 174:8bb9f3a33240 163 obj->cpha = SPI_CPHA_1Edge;
mbed_official 174:8bb9f3a33240 164 break;
mbed_official 76:aeb1df146756 165 case 1:
mbed_official 174:8bb9f3a33240 166 obj->cpol = SPI_CPOL_Low;
mbed_official 174:8bb9f3a33240 167 obj->cpha = SPI_CPHA_2Edge;
mbed_official 174:8bb9f3a33240 168 break;
mbed_official 76:aeb1df146756 169 case 2:
mbed_official 174:8bb9f3a33240 170 obj->cpol = SPI_CPOL_High;
mbed_official 174:8bb9f3a33240 171 obj->cpha = SPI_CPHA_1Edge;
mbed_official 174:8bb9f3a33240 172 break;
mbed_official 76:aeb1df146756 173 default:
mbed_official 174:8bb9f3a33240 174 obj->cpol = SPI_CPOL_High;
mbed_official 174:8bb9f3a33240 175 obj->cpha = SPI_CPHA_2Edge;
mbed_official 174:8bb9f3a33240 176 break;
mbed_official 76:aeb1df146756 177 }
mbed_official 174:8bb9f3a33240 178
mbed_official 76:aeb1df146756 179 if (slave == 0) {
mbed_official 76:aeb1df146756 180 obj->mode = SPI_Mode_Master;
mbed_official 76:aeb1df146756 181 obj->nss = SPI_NSS_Soft;
mbed_official 174:8bb9f3a33240 182 } else {
mbed_official 76:aeb1df146756 183 obj->mode = SPI_Mode_Slave;
mbed_official 174:8bb9f3a33240 184 obj->nss = SPI_NSS_Hard;
mbed_official 76:aeb1df146756 185 }
mbed_official 174:8bb9f3a33240 186
mbed_official 76:aeb1df146756 187 init_spi(obj);
mbed_official 76:aeb1df146756 188 }
mbed_official 76:aeb1df146756 189
mbed_official 76:aeb1df146756 190 void spi_frequency(spi_t *obj, int hz) {
mbed_official 139:e3413eddde57 191 // Values depend of PCLK1 and PCLK2: 32 MHz if HSI is used, 24 MHz if HSE is used
mbed_official 139:e3413eddde57 192 if (SystemCoreClock == 32000000) { // HSI
mbed_official 139:e3413eddde57 193 if (hz < 250000) {
mbed_official 139:e3413eddde57 194 obj->br_presc = SPI_BaudRatePrescaler_256; // 125 kHz
mbed_official 174:8bb9f3a33240 195 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 139:e3413eddde57 196 obj->br_presc = SPI_BaudRatePrescaler_128; // 250 kHz
mbed_official 174:8bb9f3a33240 197 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 198 obj->br_presc = SPI_BaudRatePrescaler_64; // 500 kHz
mbed_official 174:8bb9f3a33240 199 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 139:e3413eddde57 200 obj->br_presc = SPI_BaudRatePrescaler_32; // 1 MHz
mbed_official 174:8bb9f3a33240 201 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 139:e3413eddde57 202 obj->br_presc = SPI_BaudRatePrescaler_16; // 2 MHz
mbed_official 174:8bb9f3a33240 203 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 139:e3413eddde57 204 obj->br_presc = SPI_BaudRatePrescaler_8; // 4 MHz
mbed_official 174:8bb9f3a33240 205 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 139:e3413eddde57 206 obj->br_presc = SPI_BaudRatePrescaler_4; // 8 MHz
mbed_official 174:8bb9f3a33240 207 } else { // >= 16000000
mbed_official 139:e3413eddde57 208 obj->br_presc = SPI_BaudRatePrescaler_2; // 16 MHz
mbed_official 139:e3413eddde57 209 }
mbed_official 174:8bb9f3a33240 210 } else { // 24 MHz - HSE
mbed_official 139:e3413eddde57 211 if (hz < 180000) {
mbed_official 139:e3413eddde57 212 obj->br_presc = SPI_BaudRatePrescaler_256; // 94 kHz
mbed_official 174:8bb9f3a33240 213 } else if ((hz >= 180000) && (hz < 350000)) {
mbed_official 139:e3413eddde57 214 obj->br_presc = SPI_BaudRatePrescaler_128; // 188 kHz
mbed_official 174:8bb9f3a33240 215 } else if ((hz >= 350000) && (hz < 750000)) {
mbed_official 139:e3413eddde57 216 obj->br_presc = SPI_BaudRatePrescaler_64; // 375 kHz
mbed_official 174:8bb9f3a33240 217 } else if ((hz >= 750000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 218 obj->br_presc = SPI_BaudRatePrescaler_32; // 750 kHz
mbed_official 174:8bb9f3a33240 219 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 174:8bb9f3a33240 220 obj->br_presc = SPI_BaudRatePrescaler_16; // 1.5 MHz
mbed_official 174:8bb9f3a33240 221 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 174:8bb9f3a33240 222 obj->br_presc = SPI_BaudRatePrescaler_8; // 3 MHz
mbed_official 174:8bb9f3a33240 223 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 174:8bb9f3a33240 224 obj->br_presc = SPI_BaudRatePrescaler_4; // 6 MHz
mbed_official 174:8bb9f3a33240 225 } else { // >= 12000000
mbed_official 174:8bb9f3a33240 226 obj->br_presc = SPI_BaudRatePrescaler_2; // 12 MHz
mbed_official 139:e3413eddde57 227 }
mbed_official 129:0182c99221bc 228 }
mbed_official 76:aeb1df146756 229 init_spi(obj);
mbed_official 76:aeb1df146756 230 }
mbed_official 76:aeb1df146756 231
mbed_official 76:aeb1df146756 232 static inline int ssp_readable(spi_t *obj) {
mbed_official 76:aeb1df146756 233 int status;
mbed_official 76:aeb1df146756 234 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 235 // Check if data is received
mbed_official 76:aeb1df146756 236 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 174:8bb9f3a33240 237 return status;
mbed_official 76:aeb1df146756 238 }
mbed_official 76:aeb1df146756 239
mbed_official 76:aeb1df146756 240 static inline int ssp_writeable(spi_t *obj) {
mbed_official 76:aeb1df146756 241 int status;
mbed_official 76:aeb1df146756 242 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 243 // Check if data is transmitted
mbed_official 76:aeb1df146756 244 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 245 return status;
mbed_official 76:aeb1df146756 246 }
mbed_official 76:aeb1df146756 247
mbed_official 76:aeb1df146756 248 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 174:8bb9f3a33240 249 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 250 while (!ssp_writeable(obj));
mbed_official 76:aeb1df146756 251 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 76:aeb1df146756 252 }
mbed_official 76:aeb1df146756 253
mbed_official 76:aeb1df146756 254 static inline int ssp_read(spi_t *obj) {
mbed_official 174:8bb9f3a33240 255 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 256 while (!ssp_readable(obj));
mbed_official 76:aeb1df146756 257 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 76:aeb1df146756 258 }
mbed_official 76:aeb1df146756 259
mbed_official 76:aeb1df146756 260 static inline int ssp_busy(spi_t *obj) {
mbed_official 76:aeb1df146756 261 int status;
mbed_official 76:aeb1df146756 262 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 263 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 264 return status;
mbed_official 76:aeb1df146756 265 }
mbed_official 76:aeb1df146756 266
mbed_official 76:aeb1df146756 267 int spi_master_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 268 ssp_write(obj, value);
mbed_official 76:aeb1df146756 269 return ssp_read(obj);
mbed_official 76:aeb1df146756 270 }
mbed_official 76:aeb1df146756 271
mbed_official 76:aeb1df146756 272 int spi_slave_receive(spi_t *obj) {
mbed_official 76:aeb1df146756 273 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 76:aeb1df146756 274 };
mbed_official 76:aeb1df146756 275
mbed_official 76:aeb1df146756 276 int spi_slave_read(spi_t *obj) {
mbed_official 76:aeb1df146756 277 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 278 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 76:aeb1df146756 279 }
mbed_official 76:aeb1df146756 280
mbed_official 76:aeb1df146756 281 void spi_slave_write(spi_t *obj, int value) {
mbed_official 174:8bb9f3a33240 282 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 174:8bb9f3a33240 283 while (!ssp_writeable(obj));
mbed_official 76:aeb1df146756 284 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 76:aeb1df146756 285 }
mbed_official 76:aeb1df146756 286
mbed_official 76:aeb1df146756 287 int spi_busy(spi_t *obj) {
mbed_official 76:aeb1df146756 288 return ssp_busy(obj);
mbed_official 76:aeb1df146756 289 }
mbed_official 76:aeb1df146756 290
mbed_official 76:aeb1df146756 291 #endif