test / mbed-src

mbed library sources

Dependents:   bare

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/spi_api.c@125:23cc3068a9e4, 2014-03-19 (annotated)

Committer:
mbed_official
Date:
Wed Mar 19 10:15:22 2014 +0000
Revision:
125:23cc3068a9e4
Parent:
115:4f0cb9cdc478 
Synchronized with git revision ace35dfba3748c7cdc102eb38ec6b9e1067c3252



Full URL: https://github.com/mbedmicro/mbed/commit/ace35dfba3748c7cdc102eb38ec6b9e1067c3252/



[NUCLEO_F302R8] Add cmsis and hal files + change F401RE clock to 84MHz

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 87:085cde657901 1 /* mbed Microcontroller Library
mbed_official 87:085cde657901 2 *******************************************************************************
mbed_official 87:085cde657901 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 87:085cde657901 4 * All rights reserved.
mbed_official 87:085cde657901 5 *
mbed_official 87:085cde657901 6 * Redistribution and use in source and binary forms, with or without
mbed_official 87:085cde657901 7 * modification, are permitted provided that the following conditions are met:
mbed_official 87:085cde657901 8 *
mbed_official 87:085cde657901 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 87:085cde657901 10 * this list of conditions and the following disclaimer.
mbed_official 87:085cde657901 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 87:085cde657901 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 87:085cde657901 13 * and/or other materials provided with the distribution.
mbed_official 87:085cde657901 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 87:085cde657901 15 * may be used to endorse or promote products derived from this software
mbed_official 87:085cde657901 16 * without specific prior written permission.
mbed_official 87:085cde657901 17 *
mbed_official 87:085cde657901 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 87:085cde657901 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 87:085cde657901 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 87:085cde657901 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 87:085cde657901 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 87:085cde657901 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 87:085cde657901 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 87:085cde657901 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 87:085cde657901 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 87:085cde657901 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 87:085cde657901 28 *******************************************************************************
mbed_official 87:085cde657901 29 */
mbed_official 87:085cde657901 30 #include "spi_api.h"
mbed_official 87:085cde657901 31
mbed_official 87:085cde657901 32 #if DEVICE_SPI
mbed_official 87:085cde657901 33
mbed_official 87:085cde657901 34 #include <math.h>
mbed_official 87:085cde657901 35 #include "cmsis.h"
mbed_official 87:085cde657901 36 #include "pinmap.h"
mbed_official 87:085cde657901 37 #include "error.h"
mbed_official 87:085cde657901 38 #include "stm32f4xx_hal.h"
mbed_official 87:085cde657901 39
mbed_official 87:085cde657901 40 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 88:81f18c97d490 41 {PA_7, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 115:4f0cb9cdc478 42 {PB_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 125:23cc3068a9e4 43 //{PB_5, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 115:4f0cb9cdc478 44 {PB_15, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 125:23cc3068a9e4 45 {PC_3, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 115:4f0cb9cdc478 46 {PC_12, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 87:085cde657901 47 {NC, NC, 0}
mbed_official 87:085cde657901 48 };
mbed_official 87:085cde657901 49
mbed_official 87:085cde657901 50 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 88:81f18c97d490 51 {PA_6, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 115:4f0cb9cdc478 52 {PB_4, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 125:23cc3068a9e4 53 //{PB_4, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 115:4f0cb9cdc478 54 {PB_14, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 125:23cc3068a9e4 55 {PC_2, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 115:4f0cb9cdc478 56 {PC_11, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 87:085cde657901 57 {NC, NC, 0}
mbed_official 87:085cde657901 58 };
mbed_official 87:085cde657901 59
mbed_official 87:085cde657901 60 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 88:81f18c97d490 61 {PA_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 115:4f0cb9cdc478 62 {PB_3, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 125:23cc3068a9e4 63 //{PB_3, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 115:4f0cb9cdc478 64 {PB_10, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 115:4f0cb9cdc478 65 {PB_13, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 115:4f0cb9cdc478 66 {PC_10, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 87:085cde657901 67 {NC, NC, 0}
mbed_official 87:085cde657901 68 };
mbed_official 87:085cde657901 69
mbed_official 87:085cde657901 70 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 125:23cc3068a9e4 71 {PA_4, SPI_1, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF5_SPI1)},
mbed_official 125:23cc3068a9e4 72 //{PA_4, SPI_3, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF6_SPI3)},
mbed_official 125:23cc3068a9e4 73 {PA_15, SPI_1, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF5_SPI1)},
mbed_official 125:23cc3068a9e4 74 //{PA_15, SPI_3, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF6_SPI3)},
mbed_official 125:23cc3068a9e4 75 {PB_9, SPI_2, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF5_SPI2)},
mbed_official 125:23cc3068a9e4 76 {PB_12, SPI_2, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF5_SPI2)},
mbed_official 87:085cde657901 77 {NC, NC, 0}
mbed_official 87:085cde657901 78 };
mbed_official 87:085cde657901 79
mbed_official 87:085cde657901 80 static SPI_HandleTypeDef SpiHandle;
mbed_official 87:085cde657901 81
mbed_official 87:085cde657901 82 static void init_spi(spi_t *obj) {
mbed_official 87:085cde657901 83 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 84
mbed_official 87:085cde657901 85 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 87:085cde657901 86
mbed_official 87:085cde657901 87 SpiHandle.Init.Mode = obj->mode;
mbed_official 87:085cde657901 88 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 87:085cde657901 89 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 87:085cde657901 90 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 87:085cde657901 91 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 87:085cde657901 92 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 87:085cde657901 93 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 87:085cde657901 94 SpiHandle.Init.DataSize = obj->bits;
mbed_official 87:085cde657901 95 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 87:085cde657901 96 SpiHandle.Init.NSS = obj->nss;
mbed_official 87:085cde657901 97 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 87:085cde657901 98
mbed_official 87:085cde657901 99 HAL_SPI_Init(&SpiHandle);
mbed_official 87:085cde657901 100
mbed_official 87:085cde657901 101 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 87:085cde657901 102 }
mbed_official 87:085cde657901 103
mbed_official 87:085cde657901 104 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 87:085cde657901 105 // Determine the SPI to use
mbed_official 87:085cde657901 106 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 87:085cde657901 107 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 87:085cde657901 108 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 87:085cde657901 109 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 87:085cde657901 110
mbed_official 87:085cde657901 111 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 87:085cde657901 112 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 87:085cde657901 113
mbed_official 87:085cde657901 114 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 87:085cde657901 115
mbed_official 87:085cde657901 116 if (obj->spi == (SPIName)NC) {
mbed_official 87:085cde657901 117 error("SPI error: pinout mapping failed.");
mbed_official 87:085cde657901 118 }
mbed_official 87:085cde657901 119
mbed_official 87:085cde657901 120 // Enable SPI clock
mbed_official 87:085cde657901 121 if (obj->spi == SPI_1) {
mbed_official 87:085cde657901 122 __SPI1_CLK_ENABLE();
mbed_official 87:085cde657901 123 }
mbed_official 115:4f0cb9cdc478 124 if (obj->spi == SPI_2) {
mbed_official 115:4f0cb9cdc478 125 __SPI2_CLK_ENABLE();
mbed_official 115:4f0cb9cdc478 126 }
mbed_official 115:4f0cb9cdc478 127 if (obj->spi == SPI_3) {
mbed_official 115:4f0cb9cdc478 128 __SPI3_CLK_ENABLE();
mbed_official 115:4f0cb9cdc478 129 }
mbed_official 87:085cde657901 130
mbed_official 87:085cde657901 131 // Configure the SPI pins
mbed_official 87:085cde657901 132 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 87:085cde657901 133 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 87:085cde657901 134 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 87:085cde657901 135
mbed_official 87:085cde657901 136 // Save new values
mbed_official 87:085cde657901 137 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 87:085cde657901 138 obj->cpol = SPI_POLARITY_LOW;
mbed_official 87:085cde657901 139 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 125:23cc3068a9e4 140 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 87:085cde657901 141
mbed_official 115:4f0cb9cdc478 142 if (ssel == NC) { // SW NSS Master mode
mbed_official 87:085cde657901 143 obj->mode = SPI_MODE_MASTER;
mbed_official 87:085cde657901 144 obj->nss = SPI_NSS_SOFT;
mbed_official 87:085cde657901 145 }
mbed_official 87:085cde657901 146 else { // Slave
mbed_official 87:085cde657901 147 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 87:085cde657901 148 obj->mode = SPI_MODE_SLAVE;
mbed_official 87:085cde657901 149 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 87:085cde657901 150 }
mbed_official 87:085cde657901 151
mbed_official 87:085cde657901 152 init_spi(obj);
mbed_official 87:085cde657901 153 }
mbed_official 87:085cde657901 154
mbed_official 87:085cde657901 155 void spi_free(spi_t *obj) {
mbed_official 87:085cde657901 156 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 157 HAL_SPI_DeInit(&SpiHandle);
mbed_official 87:085cde657901 158 }
mbed_official 87:085cde657901 159
mbed_official 87:085cde657901 160 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 87:085cde657901 161 // Save new values
mbed_official 87:085cde657901 162 if (bits == 8) {
mbed_official 87:085cde657901 163 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 87:085cde657901 164 }
mbed_official 87:085cde657901 165 else {
mbed_official 87:085cde657901 166 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 87:085cde657901 167 }
mbed_official 87:085cde657901 168
mbed_official 87:085cde657901 169 switch (mode) {
mbed_official 87:085cde657901 170 case 0:
mbed_official 87:085cde657901 171 obj->cpol = SPI_POLARITY_LOW;
mbed_official 87:085cde657901 172 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 87:085cde657901 173 break;
mbed_official 87:085cde657901 174 case 1:
mbed_official 87:085cde657901 175 obj->cpol = SPI_POLARITY_LOW;
mbed_official 87:085cde657901 176 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 87:085cde657901 177 break;
mbed_official 87:085cde657901 178 case 2:
mbed_official 87:085cde657901 179 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 87:085cde657901 180 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 87:085cde657901 181 break;
mbed_official 87:085cde657901 182 default:
mbed_official 87:085cde657901 183 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 87:085cde657901 184 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 87:085cde657901 185 break;
mbed_official 87:085cde657901 186 }
mbed_official 87:085cde657901 187
mbed_official 87:085cde657901 188 if (slave == 0) {
mbed_official 87:085cde657901 189 obj->mode = SPI_MODE_MASTER;
mbed_official 87:085cde657901 190 obj->nss = SPI_NSS_SOFT;
mbed_official 87:085cde657901 191 }
mbed_official 87:085cde657901 192 else {
mbed_official 87:085cde657901 193 obj->mode = SPI_MODE_SLAVE;
mbed_official 87:085cde657901 194 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 87:085cde657901 195 }
mbed_official 87:085cde657901 196
mbed_official 87:085cde657901 197 init_spi(obj);
mbed_official 87:085cde657901 198 }
mbed_official 87:085cde657901 199
mbed_official 87:085cde657901 200 void spi_frequency(spi_t *obj, int hz) {
mbed_official 125:23cc3068a9e4 201 // Note: The frequencies are obtained with SPI1 clock = 84 MHz (APB2 clock)
mbed_official 125:23cc3068a9e4 202 if (hz < 600000) {
mbed_official 125:23cc3068a9e4 203 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 330 kHz
mbed_official 125:23cc3068a9e4 204 }
mbed_official 125:23cc3068a9e4 205 else if ((hz >= 600000) && (hz < 1000000)) {
mbed_official 125:23cc3068a9e4 206 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 656 kHz
mbed_official 125:23cc3068a9e4 207 }
mbed_official 125:23cc3068a9e4 208 else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 125:23cc3068a9e4 209 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.3 MHz
mbed_official 125:23cc3068a9e4 210 }
mbed_official 125:23cc3068a9e4 211 else if ((hz >= 2000000) && (hz < 5000000)) {
mbed_official 125:23cc3068a9e4 212 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2.6 MHz
mbed_official 115:4f0cb9cdc478 213 }
mbed_official 125:23cc3068a9e4 214 else if ((hz >= 5000000) && (hz < 10000000)) {
mbed_official 125:23cc3068a9e4 215 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 5.25 MHz
mbed_official 125:23cc3068a9e4 216 }
mbed_official 125:23cc3068a9e4 217 else if ((hz >= 10000000) && (hz < 21000000)) {
mbed_official 125:23cc3068a9e4 218 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 10.5 MHz
mbed_official 125:23cc3068a9e4 219 }
mbed_official 125:23cc3068a9e4 220 else if ((hz >= 21000000) && (hz < 42000000)) {
mbed_official 125:23cc3068a9e4 221 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 21 MHz
mbed_official 125:23cc3068a9e4 222 }
mbed_official 125:23cc3068a9e4 223 else { // >= 42000000
mbed_official 125:23cc3068a9e4 224 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 42 MHz
mbed_official 125:23cc3068a9e4 225 }
mbed_official 87:085cde657901 226 init_spi(obj);
mbed_official 87:085cde657901 227 }
mbed_official 87:085cde657901 228
mbed_official 87:085cde657901 229 static inline int ssp_readable(spi_t *obj) {
mbed_official 87:085cde657901 230 int status;
mbed_official 87:085cde657901 231 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 232 // Check if data is received
mbed_official 87:085cde657901 233 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 87:085cde657901 234 return status;
mbed_official 87:085cde657901 235 }
mbed_official 87:085cde657901 236
mbed_official 87:085cde657901 237 static inline int ssp_writeable(spi_t *obj) {
mbed_official 87:085cde657901 238 int status;
mbed_official 87:085cde657901 239 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 240 // Check if data is transmitted
mbed_official 87:085cde657901 241 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 87:085cde657901 242 return status;
mbed_official 87:085cde657901 243 }
mbed_official 87:085cde657901 244
mbed_official 87:085cde657901 245 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 87:085cde657901 246 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 247 while (!ssp_writeable(obj));
mbed_official 125:23cc3068a9e4 248 spi->DR = (uint16_t)value;
mbed_official 87:085cde657901 249 }
mbed_official 87:085cde657901 250
mbed_official 87:085cde657901 251 static inline int ssp_read(spi_t *obj) {
mbed_official 87:085cde657901 252 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 253 while (!ssp_readable(obj));
mbed_official 87:085cde657901 254 return (int)spi->DR;
mbed_official 87:085cde657901 255 }
mbed_official 87:085cde657901 256
mbed_official 87:085cde657901 257 static inline int ssp_busy(spi_t *obj) {
mbed_official 87:085cde657901 258 int status;
mbed_official 87:085cde657901 259 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 260 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 87:085cde657901 261 return status;
mbed_official 87:085cde657901 262 }
mbed_official 87:085cde657901 263
mbed_official 87:085cde657901 264 int spi_master_write(spi_t *obj, int value) {
mbed_official 87:085cde657901 265 ssp_write(obj, value);
mbed_official 87:085cde657901 266 return ssp_read(obj);
mbed_official 87:085cde657901 267 }
mbed_official 87:085cde657901 268
mbed_official 87:085cde657901 269 int spi_slave_receive(spi_t *obj) {
mbed_official 87:085cde657901 270 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 87:085cde657901 271 };
mbed_official 87:085cde657901 272
mbed_official 87:085cde657901 273 int spi_slave_read(spi_t *obj) {
mbed_official 87:085cde657901 274 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 275 return (int)spi->DR;
mbed_official 87:085cde657901 276 }
mbed_official 87:085cde657901 277
mbed_official 87:085cde657901 278 void spi_slave_write(spi_t *obj, int value) {
mbed_official 87:085cde657901 279 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 280 while (!ssp_writeable(obj));
mbed_official 125:23cc3068a9e4 281 spi->DR = (uint16_t)value;
mbed_official 87:085cde657901 282 }
mbed_official 87:085cde657901 283
mbed_official 87:085cde657901 284 int spi_busy(spi_t *obj) {
mbed_official 87:085cde657901 285 return ssp_busy(obj);
mbed_official 87:085cde657901 286 }
mbed_official 87:085cde657901 287
mbed_official 87:085cde657901 288 #endif