shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F401RE/spi_api.c@115:4f0cb9cdc478, 2014-03-11 (annotated)

Committer:
mbed_official
Date:
Tue Mar 11 12:00:07 2014 +0000
Revision:
115:4f0cb9cdc478
Parent:
88:81f18c97d490
Child:
125:23cc3068a9e4
Synchronized with git revision 2bb462f5a37de3bf6e9c9ad9dc33e60be35d06a7



Full URL: https://github.com/mbedmicro/mbed/commit/2bb462f5a37de3bf6e9c9ad9dc33e60be35d06a7/

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 115:4f0cb9cdc478 43 {PC_3, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 115:4f0cb9cdc478 44 {PB_15, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 115:4f0cb9cdc478 45 {PC_12, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 115:4f0cb9cdc478 46 {PB_5 , 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 115:4f0cb9cdc478 53 {PC_2, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 115:4f0cb9cdc478 54 {PB_14, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 115:4f0cb9cdc478 55 {PC_11, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 115:4f0cb9cdc478 56 {PB_4 , 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 115:4f0cb9cdc478 63 {PB_10, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 115:4f0cb9cdc478 64 {PB_13, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 115:4f0cb9cdc478 65 {PC_10, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 115:4f0cb9cdc478 66 {PB_3 , 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 // Only used in Slave mode
mbed_official 87:085cde657901 71 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 115:4f0cb9cdc478 72 {PA_4, SPI_1, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF5_SPI1)},
mbed_official 115:4f0cb9cdc478 73 {PA_15, SPI_1, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF5_SPI1)},
mbed_official 115:4f0cb9cdc478 74 {PB_9 , SPI_2, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF5_SPI2)},
mbed_official 115:4f0cb9cdc478 75 {PB_12, SPI_2, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF5_SPI2)},
mbed_official 115:4f0cb9cdc478 76 {PA_4 , SPI_3, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF6_SPI3)},
mbed_official 115:4f0cb9cdc478 77 {PA_15, SPI_3, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF6_SPI3)},
mbed_official 87:085cde657901 78 {NC, NC, 0}
mbed_official 87:085cde657901 79 };
mbed_official 87:085cde657901 80
mbed_official 87:085cde657901 81 static SPI_HandleTypeDef SpiHandle;
mbed_official 87:085cde657901 82
mbed_official 87:085cde657901 83 static void init_spi(spi_t *obj) {
mbed_official 87:085cde657901 84 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 85
mbed_official 87:085cde657901 86 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 87:085cde657901 87
mbed_official 87:085cde657901 88 SpiHandle.Init.Mode = obj->mode;
mbed_official 87:085cde657901 89 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 87:085cde657901 90 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 87:085cde657901 91 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 87:085cde657901 92 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 87:085cde657901 93 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 87:085cde657901 94 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 87:085cde657901 95 SpiHandle.Init.DataSize = obj->bits;
mbed_official 87:085cde657901 96 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 87:085cde657901 97 SpiHandle.Init.NSS = obj->nss;
mbed_official 87:085cde657901 98 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 87:085cde657901 99
mbed_official 87:085cde657901 100 HAL_SPI_Init(&SpiHandle);
mbed_official 87:085cde657901 101
mbed_official 87:085cde657901 102 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 87:085cde657901 103 }
mbed_official 87:085cde657901 104
mbed_official 87:085cde657901 105 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 87:085cde657901 106 // Determine the SPI to use
mbed_official 87:085cde657901 107 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 87:085cde657901 108 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 87:085cde657901 109 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 87:085cde657901 110 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 87:085cde657901 111
mbed_official 87:085cde657901 112 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 87:085cde657901 113 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 87:085cde657901 114
mbed_official 87:085cde657901 115 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 87:085cde657901 116
mbed_official 87:085cde657901 117 if (obj->spi == (SPIName)NC) {
mbed_official 87:085cde657901 118 error("SPI error: pinout mapping failed.");
mbed_official 87:085cde657901 119 }
mbed_official 87:085cde657901 120
mbed_official 87:085cde657901 121 // Enable SPI clock
mbed_official 87:085cde657901 122 if (obj->spi == SPI_1) {
mbed_official 87:085cde657901 123 __SPI1_CLK_ENABLE();
mbed_official 87:085cde657901 124 }
mbed_official 115:4f0cb9cdc478 125 if (obj->spi == SPI_2) {
mbed_official 115:4f0cb9cdc478 126 __SPI2_CLK_ENABLE();
mbed_official 115:4f0cb9cdc478 127 }
mbed_official 115:4f0cb9cdc478 128 if (obj->spi == SPI_3) {
mbed_official 115:4f0cb9cdc478 129 __SPI3_CLK_ENABLE();
mbed_official 115:4f0cb9cdc478 130 }
mbed_official 87:085cde657901 131
mbed_official 87:085cde657901 132 // Configure the SPI pins
mbed_official 87:085cde657901 133 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 87:085cde657901 134 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 87:085cde657901 135 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 115:4f0cb9cdc478 136 if (ssel != NC) { // slave mode
mbed_official 115:4f0cb9cdc478 137 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 115:4f0cb9cdc478 138 }
mbed_official 87:085cde657901 139
mbed_official 87:085cde657901 140 // Save new values
mbed_official 87:085cde657901 141 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 87:085cde657901 142 obj->cpol = SPI_POLARITY_LOW;
mbed_official 87:085cde657901 143 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 87:085cde657901 144 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 1MHz (with HSI=16MHz and APB2CLKDivider=2)
mbed_official 87:085cde657901 145
mbed_official 115:4f0cb9cdc478 146 if (ssel == NC) { // SW NSS Master mode
mbed_official 87:085cde657901 147 obj->mode = SPI_MODE_MASTER;
mbed_official 87:085cde657901 148 obj->nss = SPI_NSS_SOFT;
mbed_official 87:085cde657901 149 }
mbed_official 87:085cde657901 150 else { // Slave
mbed_official 87:085cde657901 151 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 87:085cde657901 152 obj->mode = SPI_MODE_SLAVE;
mbed_official 87:085cde657901 153 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 87:085cde657901 154 }
mbed_official 87:085cde657901 155
mbed_official 87:085cde657901 156 init_spi(obj);
mbed_official 87:085cde657901 157 }
mbed_official 87:085cde657901 158
mbed_official 87:085cde657901 159 void spi_free(spi_t *obj) {
mbed_official 87:085cde657901 160 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 161 HAL_SPI_DeInit(&SpiHandle);
mbed_official 87:085cde657901 162 }
mbed_official 87:085cde657901 163
mbed_official 87:085cde657901 164 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 87:085cde657901 165 // Save new values
mbed_official 87:085cde657901 166 if (bits == 8) {
mbed_official 87:085cde657901 167 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 87:085cde657901 168 }
mbed_official 87:085cde657901 169 else {
mbed_official 87:085cde657901 170 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 87:085cde657901 171 }
mbed_official 87:085cde657901 172
mbed_official 87:085cde657901 173 switch (mode) {
mbed_official 87:085cde657901 174 case 0:
mbed_official 87:085cde657901 175 obj->cpol = SPI_POLARITY_LOW;
mbed_official 87:085cde657901 176 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 87:085cde657901 177 break;
mbed_official 87:085cde657901 178 case 1:
mbed_official 87:085cde657901 179 obj->cpol = SPI_POLARITY_LOW;
mbed_official 87:085cde657901 180 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 87:085cde657901 181 break;
mbed_official 87:085cde657901 182 case 2:
mbed_official 87:085cde657901 183 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 87:085cde657901 184 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 87:085cde657901 185 break;
mbed_official 87:085cde657901 186 default:
mbed_official 87:085cde657901 187 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 87:085cde657901 188 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 87:085cde657901 189 break;
mbed_official 87:085cde657901 190 }
mbed_official 87:085cde657901 191
mbed_official 87:085cde657901 192 if (slave == 0) {
mbed_official 87:085cde657901 193 obj->mode = SPI_MODE_MASTER;
mbed_official 87:085cde657901 194 obj->nss = SPI_NSS_SOFT;
mbed_official 87:085cde657901 195 }
mbed_official 87:085cde657901 196 else {
mbed_official 87:085cde657901 197 obj->mode = SPI_MODE_SLAVE;
mbed_official 87:085cde657901 198 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 87:085cde657901 199 }
mbed_official 87:085cde657901 200
mbed_official 87:085cde657901 201 init_spi(obj);
mbed_official 87:085cde657901 202 }
mbed_official 87:085cde657901 203
mbed_official 87:085cde657901 204 void spi_frequency(spi_t *obj, int hz) {
mbed_official 87:085cde657901 205 // Get SPI clock frequency
mbed_official 87:085cde657901 206
mbed_official 115:4f0cb9cdc478 207 // SPI1 runs from PCLK2, which runs at SystemCoreClock / 2. SPI2 and SPI3
mbed_official 115:4f0cb9cdc478 208 // run from PCLK1, which runs at SystemCoreClock / 4.
mbed_official 115:4f0cb9cdc478 209 uint32_t PCLK = SystemCoreClock;
mbed_official 115:4f0cb9cdc478 210 switch ((int)obj->spi) {
mbed_official 115:4f0cb9cdc478 211 case SPI_1: PCLK = PCLK >> 1; break;
mbed_official 115:4f0cb9cdc478 212 case SPI_2: PCLK = PCLK >> 2; break;
mbed_official 115:4f0cb9cdc478 213 case SPI_3: PCLK = PCLK >> 2; break;
mbed_official 115:4f0cb9cdc478 214 }
mbed_official 87:085cde657901 215 // Choose the baud rate divisor (between 2 and 256)
mbed_official 87:085cde657901 216 uint32_t divisor = PCLK / hz;
mbed_official 87:085cde657901 217
mbed_official 87:085cde657901 218 // Find the nearest power-of-2
mbed_official 87:085cde657901 219 divisor = (divisor > 0 ? divisor-1 : 0);
mbed_official 87:085cde657901 220 divisor |= divisor >> 1;
mbed_official 87:085cde657901 221 divisor |= divisor >> 2;
mbed_official 87:085cde657901 222 divisor |= divisor >> 4;
mbed_official 87:085cde657901 223 divisor |= divisor >> 8;
mbed_official 87:085cde657901 224 divisor |= divisor >> 16;
mbed_official 87:085cde657901 225 divisor++;
mbed_official 87:085cde657901 226
mbed_official 87:085cde657901 227 uint32_t baud_rate = __builtin_ffs(divisor) - 2;
mbed_official 87:085cde657901 228
mbed_official 87:085cde657901 229 // Save new value
mbed_official 87:085cde657901 230 obj->br_presc = ((baud_rate > 7) ? (7 << 3) : (baud_rate << 3));
mbed_official 87:085cde657901 231
mbed_official 87:085cde657901 232 init_spi(obj);
mbed_official 87:085cde657901 233 }
mbed_official 87:085cde657901 234
mbed_official 87:085cde657901 235 static inline int ssp_readable(spi_t *obj) {
mbed_official 87:085cde657901 236 int status;
mbed_official 87:085cde657901 237 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 238 // Check if data is received
mbed_official 87:085cde657901 239 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 87:085cde657901 240 return status;
mbed_official 87:085cde657901 241 }
mbed_official 87:085cde657901 242
mbed_official 87:085cde657901 243 static inline int ssp_writeable(spi_t *obj) {
mbed_official 87:085cde657901 244 int status;
mbed_official 87:085cde657901 245 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 246 // Check if data is transmitted
mbed_official 87:085cde657901 247 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 87:085cde657901 248 return status;
mbed_official 87:085cde657901 249 }
mbed_official 87:085cde657901 250
mbed_official 87:085cde657901 251 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 87:085cde657901 252 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 253 while (!ssp_writeable(obj));
mbed_official 115:4f0cb9cdc478 254 if(obj->bits == SPI_DATASIZE_8BIT)
mbed_official 115:4f0cb9cdc478 255 spi->DR = (uint8_t)value; // 8 bit mode
mbed_official 115:4f0cb9cdc478 256 else spi->DR = (uint16_t)value; // 16 bit mode
mbed_official 87:085cde657901 257 }
mbed_official 87:085cde657901 258
mbed_official 87:085cde657901 259 static inline int ssp_read(spi_t *obj) {
mbed_official 87:085cde657901 260 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 261 while (!ssp_readable(obj));
mbed_official 87:085cde657901 262 return (int)spi->DR;
mbed_official 87:085cde657901 263 }
mbed_official 87:085cde657901 264
mbed_official 87:085cde657901 265 static inline int ssp_busy(spi_t *obj) {
mbed_official 87:085cde657901 266 int status;
mbed_official 87:085cde657901 267 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 268 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 87:085cde657901 269 return status;
mbed_official 87:085cde657901 270 }
mbed_official 87:085cde657901 271
mbed_official 87:085cde657901 272 int spi_master_write(spi_t *obj, int value) {
mbed_official 87:085cde657901 273 ssp_write(obj, value);
mbed_official 87:085cde657901 274 return ssp_read(obj);
mbed_official 87:085cde657901 275 }
mbed_official 87:085cde657901 276
mbed_official 87:085cde657901 277 int spi_slave_receive(spi_t *obj) {
mbed_official 87:085cde657901 278 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 87:085cde657901 279 };
mbed_official 87:085cde657901 280
mbed_official 87:085cde657901 281 int spi_slave_read(spi_t *obj) {
mbed_official 87:085cde657901 282 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 283 return (int)spi->DR;
mbed_official 87:085cde657901 284 }
mbed_official 87:085cde657901 285
mbed_official 87:085cde657901 286 void spi_slave_write(spi_t *obj, int value) {
mbed_official 87:085cde657901 287 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 87:085cde657901 288 while (!ssp_writeable(obj));
mbed_official 87:085cde657901 289 spi->DR = (uint8_t)value;
mbed_official 87:085cde657901 290 }
mbed_official 87:085cde657901 291
mbed_official 87:085cde657901 292 int spi_busy(spi_t *obj) {
mbed_official 87:085cde657901 293 return ssp_busy(obj);
mbed_official 87:085cde657901 294 }
mbed_official 87:085cde657901 295
mbed_official 87:085cde657901 296 #endif