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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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@129:0182c99221bc, 2014-03-20 (annotated)

Committer:
mbed_official
Date:
Thu Mar 20 11:45:07 2014 +0000
Revision:
129:0182c99221bc
Parent:
118:b44c45162f28
Child:
139:e3413eddde57
Synchronized with git revision 93e44fb5a5aa010177943aaaec0126ed8b8e014d



Full URL: https://github.com/mbedmicro/mbed/commit/93e44fb5a5aa010177943aaaec0126ed8b8e014d/



[NUCLEO_F302R8] and [NUCLEO_L152RE] updates

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 129:0182c99221bc 194 // Note: The frequencies are obtained with SPI clock = 32 MHz (APB1 & APB2 clocks)
mbed_official 129:0182c99221bc 195 if (hz < 250000) {
mbed_official 129:0182c99221bc 196 obj->br_presc = SPI_BaudRatePrescaler_256; // 125 kHz
mbed_official 129:0182c99221bc 197 }
mbed_official 129:0182c99221bc 198 else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 129:0182c99221bc 199 obj->br_presc = SPI_BaudRatePrescaler_128; // 250 kHz
mbed_official 129:0182c99221bc 200 }
mbed_official 129:0182c99221bc 201 else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 129:0182c99221bc 202 obj->br_presc = SPI_BaudRatePrescaler_64; // 500 kHz
mbed_official 129:0182c99221bc 203 }
mbed_official 129:0182c99221bc 204 else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 129:0182c99221bc 205 obj->br_presc = SPI_BaudRatePrescaler_32; // 1 MHz
mbed_official 129:0182c99221bc 206 }
mbed_official 129:0182c99221bc 207 else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 129:0182c99221bc 208 obj->br_presc = SPI_BaudRatePrescaler_16; // 2 MHz
mbed_official 129:0182c99221bc 209 }
mbed_official 129:0182c99221bc 210 else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 129:0182c99221bc 211 obj->br_presc = SPI_BaudRatePrescaler_8; // 4 MHz
mbed_official 129:0182c99221bc 212 }
mbed_official 129:0182c99221bc 213 else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 129:0182c99221bc 214 obj->br_presc = SPI_BaudRatePrescaler_4; // 8 MHz
mbed_official 129:0182c99221bc 215 }
mbed_official 129:0182c99221bc 216 else { // >= 16000000
mbed_official 129:0182c99221bc 217 obj->br_presc = SPI_BaudRatePrescaler_2; // 16 MHz
mbed_official 129:0182c99221bc 218 }
mbed_official 76:aeb1df146756 219 init_spi(obj);
mbed_official 76:aeb1df146756 220 }
mbed_official 76:aeb1df146756 221
mbed_official 76:aeb1df146756 222 static inline int ssp_readable(spi_t *obj) {
mbed_official 76:aeb1df146756 223 int status;
mbed_official 76:aeb1df146756 224 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 225 // Check if data is received
mbed_official 76:aeb1df146756 226 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 227 return status;
mbed_official 76:aeb1df146756 228 }
mbed_official 76:aeb1df146756 229
mbed_official 76:aeb1df146756 230 static inline int ssp_writeable(spi_t *obj) {
mbed_official 76:aeb1df146756 231 int status;
mbed_official 76:aeb1df146756 232 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 233 // Check if data is transmitted
mbed_official 76:aeb1df146756 234 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 235 return status;
mbed_official 76:aeb1df146756 236 }
mbed_official 76:aeb1df146756 237
mbed_official 76:aeb1df146756 238 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 239 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 240 while (!ssp_writeable(obj));
mbed_official 76:aeb1df146756 241 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 76:aeb1df146756 242 }
mbed_official 76:aeb1df146756 243
mbed_official 76:aeb1df146756 244 static inline int ssp_read(spi_t *obj) {
mbed_official 76:aeb1df146756 245 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 246 while (!ssp_readable(obj));
mbed_official 76:aeb1df146756 247 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 76:aeb1df146756 248 }
mbed_official 76:aeb1df146756 249
mbed_official 76:aeb1df146756 250 static inline int ssp_busy(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 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 254 return status;
mbed_official 76:aeb1df146756 255 }
mbed_official 76:aeb1df146756 256
mbed_official 76:aeb1df146756 257 int spi_master_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 258 ssp_write(obj, value);
mbed_official 76:aeb1df146756 259 return ssp_read(obj);
mbed_official 76:aeb1df146756 260 }
mbed_official 76:aeb1df146756 261
mbed_official 76:aeb1df146756 262 int spi_slave_receive(spi_t *obj) {
mbed_official 76:aeb1df146756 263 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 76:aeb1df146756 264 };
mbed_official 76:aeb1df146756 265
mbed_official 76:aeb1df146756 266 int spi_slave_read(spi_t *obj) {
mbed_official 76:aeb1df146756 267 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 268 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 76:aeb1df146756 269 }
mbed_official 76:aeb1df146756 270
mbed_official 76:aeb1df146756 271 void spi_slave_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 272 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 273 while (!ssp_writeable(obj));
mbed_official 76:aeb1df146756 274 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 76:aeb1df146756 275 }
mbed_official 76:aeb1df146756 276
mbed_official 76:aeb1df146756 277 int spi_busy(spi_t *obj) {
mbed_official 76:aeb1df146756 278 return ssp_busy(obj);
mbed_official 76:aeb1df146756 279 }
mbed_official 76:aeb1df146756 280
mbed_official 76:aeb1df146756 281 #endif