gabriel della-monica / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_STM32F411RE/spi_api.c@429:cc5da43e7bf6, 2014-12-09 (annotated)

Committer:
mbed_official
Date:
Tue Dec 09 14:15:07 2014 +0000
Revision:
429:cc5da43e7bf6
Parent:
targets/hal/TARGET_STM/TARGET_NUCLEO_F411RE/spi_api.c@406:7b834b41c730 
Synchronized with git revision 75673df767b901eda5c6ea6c737b58deb390c955



Full URL: https://github.com/mbedmicro/mbed/commit/75673df767b901eda5c6ea6c737b58deb390c955/



Add support for mDot with STM32F411RE processor

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 235:685d5f11838f 1 /* mbed Microcontroller Library
mbed_official 235:685d5f11838f 2 *******************************************************************************
mbed_official 235:685d5f11838f 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 235:685d5f11838f 4 * All rights reserved.
mbed_official 235:685d5f11838f 5 *
mbed_official 235:685d5f11838f 6 * Redistribution and use in source and binary forms, with or without
mbed_official 235:685d5f11838f 7 * modification, are permitted provided that the following conditions are met:
mbed_official 235:685d5f11838f 8 *
mbed_official 235:685d5f11838f 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 235:685d5f11838f 10 * this list of conditions and the following disclaimer.
mbed_official 235:685d5f11838f 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 235:685d5f11838f 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 235:685d5f11838f 13 * and/or other materials provided with the distribution.
mbed_official 235:685d5f11838f 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 235:685d5f11838f 15 * may be used to endorse or promote products derived from this software
mbed_official 235:685d5f11838f 16 * without specific prior written permission.
mbed_official 235:685d5f11838f 17 *
mbed_official 235:685d5f11838f 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 235:685d5f11838f 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 235:685d5f11838f 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 235:685d5f11838f 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 235:685d5f11838f 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 235:685d5f11838f 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 235:685d5f11838f 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 235:685d5f11838f 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 235:685d5f11838f 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 235:685d5f11838f 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 235:685d5f11838f 28 *******************************************************************************
mbed_official 235:685d5f11838f 29 */
mbed_official 235:685d5f11838f 30 #include "mbed_assert.h"
mbed_official 235:685d5f11838f 31 #include "spi_api.h"
mbed_official 235:685d5f11838f 32
mbed_official 235:685d5f11838f 33 #if DEVICE_SPI
mbed_official 235:685d5f11838f 34
mbed_official 235:685d5f11838f 35 #include <math.h>
mbed_official 235:685d5f11838f 36 #include "cmsis.h"
mbed_official 235:685d5f11838f 37 #include "pinmap.h"
mbed_official 406:7b834b41c730 38 #include "PeripheralPins.h"
mbed_official 235:685d5f11838f 39
mbed_official 235:685d5f11838f 40 static SPI_HandleTypeDef SpiHandle;
mbed_official 235:685d5f11838f 41
mbed_official 235:685d5f11838f 42 static void init_spi(spi_t *obj)
mbed_official 235:685d5f11838f 43 {
mbed_official 235:685d5f11838f 44 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 235:685d5f11838f 45
mbed_official 235:685d5f11838f 46 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 235:685d5f11838f 47
mbed_official 235:685d5f11838f 48 SpiHandle.Init.Mode = obj->mode;
mbed_official 235:685d5f11838f 49 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 235:685d5f11838f 50 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 235:685d5f11838f 51 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 235:685d5f11838f 52 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 235:685d5f11838f 53 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 235:685d5f11838f 54 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 235:685d5f11838f 55 SpiHandle.Init.DataSize = obj->bits;
mbed_official 235:685d5f11838f 56 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 235:685d5f11838f 57 SpiHandle.Init.NSS = obj->nss;
mbed_official 235:685d5f11838f 58 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 235:685d5f11838f 59
mbed_official 235:685d5f11838f 60 HAL_SPI_Init(&SpiHandle);
mbed_official 235:685d5f11838f 61
mbed_official 235:685d5f11838f 62 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 235:685d5f11838f 63 }
mbed_official 235:685d5f11838f 64
mbed_official 235:685d5f11838f 65 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 235:685d5f11838f 66 {
mbed_official 235:685d5f11838f 67 // Determine the SPI to use
mbed_official 235:685d5f11838f 68 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 235:685d5f11838f 69 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 235:685d5f11838f 70 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 235:685d5f11838f 71 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 235:685d5f11838f 72
mbed_official 235:685d5f11838f 73 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 235:685d5f11838f 74 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 235:685d5f11838f 75
mbed_official 235:685d5f11838f 76 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 235:685d5f11838f 77 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 235:685d5f11838f 78
mbed_official 235:685d5f11838f 79 // Enable SPI clock
mbed_official 235:685d5f11838f 80 if (obj->spi == SPI_1) {
mbed_official 235:685d5f11838f 81 __SPI1_CLK_ENABLE();
mbed_official 235:685d5f11838f 82 }
mbed_official 404:cbc7dfcb0ce9 83
mbed_official 235:685d5f11838f 84 if (obj->spi == SPI_2) {
mbed_official 235:685d5f11838f 85 __SPI2_CLK_ENABLE();
mbed_official 235:685d5f11838f 86 }
mbed_official 404:cbc7dfcb0ce9 87
mbed_official 235:685d5f11838f 88 if (obj->spi == SPI_3) {
mbed_official 235:685d5f11838f 89 __SPI3_CLK_ENABLE();
mbed_official 235:685d5f11838f 90 }
mbed_official 404:cbc7dfcb0ce9 91
mbed_official 235:685d5f11838f 92 if (obj->spi == SPI_4) {
mbed_official 235:685d5f11838f 93 __SPI4_CLK_ENABLE();
mbed_official 235:685d5f11838f 94 }
mbed_official 404:cbc7dfcb0ce9 95
mbed_official 235:685d5f11838f 96 if (obj->spi == SPI_5) {
mbed_official 235:685d5f11838f 97 __SPI5_CLK_ENABLE();
mbed_official 235:685d5f11838f 98 }
mbed_official 235:685d5f11838f 99
mbed_official 235:685d5f11838f 100 // Configure the SPI pins
mbed_official 235:685d5f11838f 101 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 235:685d5f11838f 102 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 235:685d5f11838f 103 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 235:685d5f11838f 104
mbed_official 235:685d5f11838f 105 // Save new values
mbed_official 235:685d5f11838f 106 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 235:685d5f11838f 107 obj->cpol = SPI_POLARITY_LOW;
mbed_official 235:685d5f11838f 108 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 235:685d5f11838f 109 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 235:685d5f11838f 110
mbed_official 235:685d5f11838f 111 obj->pin_miso = miso;
mbed_official 235:685d5f11838f 112 obj->pin_mosi = mosi;
mbed_official 235:685d5f11838f 113 obj->pin_sclk = sclk;
mbed_official 235:685d5f11838f 114 obj->pin_ssel = ssel;
mbed_official 235:685d5f11838f 115
mbed_official 235:685d5f11838f 116 if (ssel == NC) { // SW NSS Master mode
mbed_official 235:685d5f11838f 117 obj->mode = SPI_MODE_MASTER;
mbed_official 235:685d5f11838f 118 obj->nss = SPI_NSS_SOFT;
mbed_official 235:685d5f11838f 119 } else { // Slave
mbed_official 235:685d5f11838f 120 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 235:685d5f11838f 121 obj->mode = SPI_MODE_SLAVE;
mbed_official 235:685d5f11838f 122 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 235:685d5f11838f 123 }
mbed_official 235:685d5f11838f 124
mbed_official 235:685d5f11838f 125 init_spi(obj);
mbed_official 235:685d5f11838f 126 }
mbed_official 235:685d5f11838f 127
mbed_official 235:685d5f11838f 128 void spi_free(spi_t *obj)
mbed_official 235:685d5f11838f 129 {
mbed_official 235:685d5f11838f 130 // Reset SPI and disable clock
mbed_official 235:685d5f11838f 131 if (obj->spi == SPI_1) {
mbed_official 235:685d5f11838f 132 __SPI1_FORCE_RESET();
mbed_official 235:685d5f11838f 133 __SPI1_RELEASE_RESET();
mbed_official 235:685d5f11838f 134 __SPI1_CLK_DISABLE();
mbed_official 235:685d5f11838f 135 }
mbed_official 404:cbc7dfcb0ce9 136
mbed_official 235:685d5f11838f 137 if (obj->spi == SPI_2) {
mbed_official 235:685d5f11838f 138 __SPI2_FORCE_RESET();
mbed_official 235:685d5f11838f 139 __SPI2_RELEASE_RESET();
mbed_official 235:685d5f11838f 140 __SPI2_CLK_DISABLE();
mbed_official 235:685d5f11838f 141 }
mbed_official 404:cbc7dfcb0ce9 142
mbed_official 235:685d5f11838f 143 if (obj->spi == SPI_3) {
mbed_official 235:685d5f11838f 144 __SPI3_FORCE_RESET();
mbed_official 235:685d5f11838f 145 __SPI3_RELEASE_RESET();
mbed_official 235:685d5f11838f 146 __SPI3_CLK_DISABLE();
mbed_official 235:685d5f11838f 147 }
mbed_official 404:cbc7dfcb0ce9 148
mbed_official 235:685d5f11838f 149 if (obj->spi == SPI_4) {
mbed_official 235:685d5f11838f 150 __SPI4_FORCE_RESET();
mbed_official 235:685d5f11838f 151 __SPI4_RELEASE_RESET();
mbed_official 235:685d5f11838f 152 __SPI4_CLK_DISABLE();
mbed_official 235:685d5f11838f 153 }
mbed_official 404:cbc7dfcb0ce9 154
mbed_official 235:685d5f11838f 155 if (obj->spi == SPI_5) {
mbed_official 235:685d5f11838f 156 __SPI5_FORCE_RESET();
mbed_official 235:685d5f11838f 157 __SPI5_RELEASE_RESET();
mbed_official 235:685d5f11838f 158 __SPI5_CLK_DISABLE();
mbed_official 235:685d5f11838f 159 }
mbed_official 235:685d5f11838f 160
mbed_official 235:685d5f11838f 161 // Configure GPIOs
mbed_official 235:685d5f11838f 162 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 235:685d5f11838f 163 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 235:685d5f11838f 164 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 235:685d5f11838f 165 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 235:685d5f11838f 166 }
mbed_official 235:685d5f11838f 167
mbed_official 235:685d5f11838f 168 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 235:685d5f11838f 169 {
mbed_official 235:685d5f11838f 170 // Save new values
mbed_official 235:685d5f11838f 171 if (bits == 16) {
mbed_official 235:685d5f11838f 172 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 235:685d5f11838f 173 } else {
mbed_official 235:685d5f11838f 174 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 235:685d5f11838f 175 }
mbed_official 235:685d5f11838f 176
mbed_official 235:685d5f11838f 177 switch (mode) {
mbed_official 235:685d5f11838f 178 case 0:
mbed_official 235:685d5f11838f 179 obj->cpol = SPI_POLARITY_LOW;
mbed_official 235:685d5f11838f 180 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 235:685d5f11838f 181 break;
mbed_official 235:685d5f11838f 182 case 1:
mbed_official 235:685d5f11838f 183 obj->cpol = SPI_POLARITY_LOW;
mbed_official 235:685d5f11838f 184 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 235:685d5f11838f 185 break;
mbed_official 235:685d5f11838f 186 case 2:
mbed_official 235:685d5f11838f 187 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 235:685d5f11838f 188 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 235:685d5f11838f 189 break;
mbed_official 235:685d5f11838f 190 default:
mbed_official 235:685d5f11838f 191 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 235:685d5f11838f 192 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 235:685d5f11838f 193 break;
mbed_official 235:685d5f11838f 194 }
mbed_official 235:685d5f11838f 195
mbed_official 235:685d5f11838f 196 if (slave == 0) {
mbed_official 235:685d5f11838f 197 obj->mode = SPI_MODE_MASTER;
mbed_official 235:685d5f11838f 198 obj->nss = SPI_NSS_SOFT;
mbed_official 235:685d5f11838f 199 } else {
mbed_official 235:685d5f11838f 200 obj->mode = SPI_MODE_SLAVE;
mbed_official 235:685d5f11838f 201 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 235:685d5f11838f 202 }
mbed_official 235:685d5f11838f 203
mbed_official 235:685d5f11838f 204 init_spi(obj);
mbed_official 235:685d5f11838f 205 }
mbed_official 235:685d5f11838f 206
mbed_official 235:685d5f11838f 207 void spi_frequency(spi_t *obj, int hz)
mbed_official 235:685d5f11838f 208 {
mbed_official 235:685d5f11838f 209 // Values depend of PCLK2: 100 MHz
mbed_official 235:685d5f11838f 210 if ((obj->spi == SPI_1) || (obj->spi == SPI_4) || (obj->spi == SPI_5)) {
mbed_official 235:685d5f11838f 211 if (hz < 700000) {
mbed_official 235:685d5f11838f 212 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 391 kHz
mbed_official 235:685d5f11838f 213 } else if ((hz >= 700000) && (hz < 1000000)) {
mbed_official 235:685d5f11838f 214 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 781 kHz
mbed_official 235:685d5f11838f 215 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 235:685d5f11838f 216 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.56 MHz
mbed_official 235:685d5f11838f 217 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 235:685d5f11838f 218 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 3.13 MHz
mbed_official 235:685d5f11838f 219 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 235:685d5f11838f 220 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 6.25 MHz
mbed_official 235:685d5f11838f 221 } else if ((hz >= 12000000) && (hz < 25000000)) {
mbed_official 235:685d5f11838f 222 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 12.5 MHz
mbed_official 235:685d5f11838f 223 } else if ((hz >= 25000000) && (hz < 50000000)) {
mbed_official 235:685d5f11838f 224 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 25 MHz
mbed_official 235:685d5f11838f 225 } else { // >= 50000000
mbed_official 235:685d5f11838f 226 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 50 MHz
mbed_official 235:685d5f11838f 227 }
mbed_official 235:685d5f11838f 228 }
mbed_official 235:685d5f11838f 229
mbed_official 235:685d5f11838f 230 // Values depend of PCLK1: 50 MHz
mbed_official 235:685d5f11838f 231 if ((obj->spi == SPI_2) || (obj->spi == SPI_3)) {
mbed_official 235:685d5f11838f 232 if (hz < 400000) {
mbed_official 235:685d5f11838f 233 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 195 kHz
mbed_official 235:685d5f11838f 234 } else if ((hz >= 400000) && (hz < 700000)) {
mbed_official 235:685d5f11838f 235 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 391 kHz
mbed_official 235:685d5f11838f 236 } else if ((hz >= 700000) && (hz < 1000000)) {
mbed_official 235:685d5f11838f 237 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 781 MHz
mbed_official 235:685d5f11838f 238 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 235:685d5f11838f 239 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.56 MHz
mbed_official 235:685d5f11838f 240 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 235:685d5f11838f 241 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3.13 MHz
mbed_official 235:685d5f11838f 242 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 235:685d5f11838f 243 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6.25 MHz
mbed_official 235:685d5f11838f 244 } else if ((hz >= 12000000) && (hz < 25000000)) {
mbed_official 235:685d5f11838f 245 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12.5 MHz
mbed_official 235:685d5f11838f 246 } else { // >= 25000000
mbed_official 235:685d5f11838f 247 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 25 MHz
mbed_official 235:685d5f11838f 248 }
mbed_official 235:685d5f11838f 249 }
mbed_official 235:685d5f11838f 250
mbed_official 235:685d5f11838f 251 init_spi(obj);
mbed_official 235:685d5f11838f 252 }
mbed_official 235:685d5f11838f 253
mbed_official 235:685d5f11838f 254 static inline int ssp_readable(spi_t *obj)
mbed_official 235:685d5f11838f 255 {
mbed_official 235:685d5f11838f 256 int status;
mbed_official 235:685d5f11838f 257 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 235:685d5f11838f 258 // Check if data is received
mbed_official 235:685d5f11838f 259 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 235:685d5f11838f 260 return status;
mbed_official 235:685d5f11838f 261 }
mbed_official 235:685d5f11838f 262
mbed_official 235:685d5f11838f 263 static inline int ssp_writeable(spi_t *obj)
mbed_official 235:685d5f11838f 264 {
mbed_official 235:685d5f11838f 265 int status;
mbed_official 235:685d5f11838f 266 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 235:685d5f11838f 267 // Check if data is transmitted
mbed_official 235:685d5f11838f 268 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 235:685d5f11838f 269 return status;
mbed_official 235:685d5f11838f 270 }
mbed_official 235:685d5f11838f 271
mbed_official 235:685d5f11838f 272 static inline void ssp_write(spi_t *obj, int value)
mbed_official 235:685d5f11838f 273 {
mbed_official 235:685d5f11838f 274 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 235:685d5f11838f 275 while (!ssp_writeable(obj));
mbed_official 235:685d5f11838f 276 spi->DR = (uint16_t)value;
mbed_official 235:685d5f11838f 277 }
mbed_official 235:685d5f11838f 278
mbed_official 235:685d5f11838f 279 static inline int ssp_read(spi_t *obj)
mbed_official 235:685d5f11838f 280 {
mbed_official 235:685d5f11838f 281 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 235:685d5f11838f 282 while (!ssp_readable(obj));
mbed_official 235:685d5f11838f 283 return (int)spi->DR;
mbed_official 235:685d5f11838f 284 }
mbed_official 235:685d5f11838f 285
mbed_official 235:685d5f11838f 286 static inline int ssp_busy(spi_t *obj)
mbed_official 235:685d5f11838f 287 {
mbed_official 235:685d5f11838f 288 int status;
mbed_official 235:685d5f11838f 289 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 235:685d5f11838f 290 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 235:685d5f11838f 291 return status;
mbed_official 235:685d5f11838f 292 }
mbed_official 235:685d5f11838f 293
mbed_official 235:685d5f11838f 294 int spi_master_write(spi_t *obj, int value)
mbed_official 235:685d5f11838f 295 {
mbed_official 235:685d5f11838f 296 ssp_write(obj, value);
mbed_official 235:685d5f11838f 297 return ssp_read(obj);
mbed_official 235:685d5f11838f 298 }
mbed_official 235:685d5f11838f 299
mbed_official 235:685d5f11838f 300 int spi_slave_receive(spi_t *obj)
mbed_official 235:685d5f11838f 301 {
mbed_official 235:685d5f11838f 302 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 235:685d5f11838f 303 };
mbed_official 235:685d5f11838f 304
mbed_official 235:685d5f11838f 305 int spi_slave_read(spi_t *obj)
mbed_official 235:685d5f11838f 306 {
mbed_official 235:685d5f11838f 307 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 235:685d5f11838f 308 while (!ssp_readable(obj));
mbed_official 235:685d5f11838f 309 return (int)spi->DR;
mbed_official 235:685d5f11838f 310 }
mbed_official 235:685d5f11838f 311
mbed_official 235:685d5f11838f 312 void spi_slave_write(spi_t *obj, int value)
mbed_official 235:685d5f11838f 313 {
mbed_official 235:685d5f11838f 314 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 235:685d5f11838f 315 while (!ssp_writeable(obj));
mbed_official 235:685d5f11838f 316 spi->DR = (uint16_t)value;
mbed_official 235:685d5f11838f 317 }
mbed_official 235:685d5f11838f 318
mbed_official 235:685d5f11838f 319 int spi_busy(spi_t *obj)
mbed_official 235:685d5f11838f 320 {
mbed_official 235:685d5f11838f 321 return ssp_busy(obj);
mbed_official 235:685d5f11838f 322 }
mbed_official 235:685d5f11838f 323
mbed_official 235:685d5f11838f 324 #endif