long dao / mbed-src

Mbed for VNG board

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F302R8/spi_api.c@414:4ec4c5b614b0, 2014-11-25 (annotated)

Committer:
mbed_official
Date:
Tue Nov 25 07:15:09 2014 +0000
Revision:
414:4ec4c5b614b0
Parent:
404:cbc7dfcb0ce9 
Synchronized with git revision fbc74e874ac089c6cb05add312fb5422be628886



Full URL: https://github.com/mbedmicro/mbed/commit/fbc74e874ac089c6cb05add312fb5422be628886/



Targets: NUCLEOs - Add PeripheralPins files for all nucleo targets

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 125:23cc3068a9e4 1 /* mbed Microcontroller Library
mbed_official 125:23cc3068a9e4 2 *******************************************************************************
mbed_official 125:23cc3068a9e4 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 125:23cc3068a9e4 4 * All rights reserved.
mbed_official 125:23cc3068a9e4 5 *
mbed_official 125:23cc3068a9e4 6 * Redistribution and use in source and binary forms, with or without
mbed_official 125:23cc3068a9e4 7 * modification, are permitted provided that the following conditions are met:
mbed_official 125:23cc3068a9e4 8 *
mbed_official 125:23cc3068a9e4 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 125:23cc3068a9e4 10 * this list of conditions and the following disclaimer.
mbed_official 125:23cc3068a9e4 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 125:23cc3068a9e4 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 125:23cc3068a9e4 13 * and/or other materials provided with the distribution.
mbed_official 125:23cc3068a9e4 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 125:23cc3068a9e4 15 * may be used to endorse or promote products derived from this software
mbed_official 125:23cc3068a9e4 16 * without specific prior written permission.
mbed_official 125:23cc3068a9e4 17 *
mbed_official 125:23cc3068a9e4 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 125:23cc3068a9e4 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 125:23cc3068a9e4 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 125:23cc3068a9e4 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 125:23cc3068a9e4 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 125:23cc3068a9e4 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 125:23cc3068a9e4 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 125:23cc3068a9e4 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 125:23cc3068a9e4 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 125:23cc3068a9e4 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 125:23cc3068a9e4 28 *******************************************************************************
mbed_official 125:23cc3068a9e4 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 125:23cc3068a9e4 31 #include "spi_api.h"
mbed_official 125:23cc3068a9e4 32
mbed_official 125:23cc3068a9e4 33 #if DEVICE_SPI
mbed_official 125:23cc3068a9e4 34
mbed_official 125:23cc3068a9e4 35 #include <math.h>
mbed_official 125:23cc3068a9e4 36 #include "cmsis.h"
mbed_official 125:23cc3068a9e4 37 #include "pinmap.h"
mbed_official 414:4ec4c5b614b0 38 #include "PeripheralPins.h"
mbed_official 125:23cc3068a9e4 39
mbed_official 330:c80ac197fa6a 40 static SPI_HandleTypeDef SpiHandle;
mbed_official 125:23cc3068a9e4 41
mbed_official 330:c80ac197fa6a 42 static void init_spi(spi_t *obj)
mbed_official 330:c80ac197fa6a 43 {
mbed_official 330:c80ac197fa6a 44 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 330:c80ac197fa6a 45
mbed_official 330:c80ac197fa6a 46 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 125:23cc3068a9e4 47
mbed_official 330:c80ac197fa6a 48 SpiHandle.Init.Mode = obj->mode;
mbed_official 330:c80ac197fa6a 49 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 330:c80ac197fa6a 50 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 330:c80ac197fa6a 51 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 330:c80ac197fa6a 52 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 330:c80ac197fa6a 53 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 330:c80ac197fa6a 54 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 330:c80ac197fa6a 55 SpiHandle.Init.DataSize = obj->bits;
mbed_official 330:c80ac197fa6a 56 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 330:c80ac197fa6a 57 SpiHandle.Init.NSS = obj->nss;
mbed_official 330:c80ac197fa6a 58 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 125:23cc3068a9e4 59
mbed_official 330:c80ac197fa6a 60 HAL_SPI_Init(&SpiHandle);
mbed_official 135:067cc8ba23da 61
mbed_official 330:c80ac197fa6a 62 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 125:23cc3068a9e4 63 }
mbed_official 125:23cc3068a9e4 64
mbed_official 330:c80ac197fa6a 65 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 330:c80ac197fa6a 66 {
mbed_official 125:23cc3068a9e4 67 // Determine the SPI to use
mbed_official 125:23cc3068a9e4 68 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 125:23cc3068a9e4 69 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 125:23cc3068a9e4 70 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 125:23cc3068a9e4 71 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 135:067cc8ba23da 72
mbed_official 125:23cc3068a9e4 73 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 125:23cc3068a9e4 74 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 135:067cc8ba23da 75
mbed_official 125:23cc3068a9e4 76 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 227:7bd0639b8911 77 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 135:067cc8ba23da 78
mbed_official 125:23cc3068a9e4 79 // Enable SPI clock
mbed_official 125:23cc3068a9e4 80 if (obj->spi == SPI_2) {
mbed_official 330:c80ac197fa6a 81 __SPI2_CLK_ENABLE();
mbed_official 125:23cc3068a9e4 82 }
mbed_official 404:cbc7dfcb0ce9 83
mbed_official 125:23cc3068a9e4 84 if (obj->spi == SPI_3) {
mbed_official 330:c80ac197fa6a 85 __SPI3_CLK_ENABLE();
mbed_official 125:23cc3068a9e4 86 }
mbed_official 135:067cc8ba23da 87
mbed_official 125:23cc3068a9e4 88 // Configure the SPI pins
mbed_official 125:23cc3068a9e4 89 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 125:23cc3068a9e4 90 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 125:23cc3068a9e4 91 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 135:067cc8ba23da 92
mbed_official 125:23cc3068a9e4 93 // Save new values
mbed_official 330:c80ac197fa6a 94 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 330:c80ac197fa6a 95 obj->cpol = SPI_POLARITY_LOW;
mbed_official 330:c80ac197fa6a 96 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 330:c80ac197fa6a 97 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz (HSI) or 1.13 MHz (HSE)
mbed_official 135:067cc8ba23da 98
mbed_official 216:577900467c9e 99 obj->pin_miso = miso;
mbed_official 216:577900467c9e 100 obj->pin_mosi = mosi;
mbed_official 216:577900467c9e 101 obj->pin_sclk = sclk;
mbed_official 216:577900467c9e 102 obj->pin_ssel = ssel;
mbed_official 216:577900467c9e 103
mbed_official 330:c80ac197fa6a 104 if (ssel == NC) { // SW NSS Master mode
mbed_official 330:c80ac197fa6a 105 obj->mode = SPI_MODE_MASTER;
mbed_official 330:c80ac197fa6a 106 obj->nss = SPI_NSS_SOFT;
mbed_official 135:067cc8ba23da 107 } else { // Slave
mbed_official 125:23cc3068a9e4 108 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 330:c80ac197fa6a 109 obj->mode = SPI_MODE_SLAVE;
mbed_official 330:c80ac197fa6a 110 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 125:23cc3068a9e4 111 }
mbed_official 125:23cc3068a9e4 112
mbed_official 125:23cc3068a9e4 113 init_spi(obj);
mbed_official 125:23cc3068a9e4 114 }
mbed_official 125:23cc3068a9e4 115
mbed_official 330:c80ac197fa6a 116 void spi_free(spi_t *obj)
mbed_official 330:c80ac197fa6a 117 {
mbed_official 216:577900467c9e 118 // Reset SPI and disable clock
mbed_official 216:577900467c9e 119 if (obj->spi == SPI_2) {
mbed_official 330:c80ac197fa6a 120 __SPI2_FORCE_RESET();
mbed_official 330:c80ac197fa6a 121 __SPI2_RELEASE_RESET();
mbed_official 330:c80ac197fa6a 122 __SPI2_CLK_DISABLE();
mbed_official 216:577900467c9e 123 }
mbed_official 404:cbc7dfcb0ce9 124
mbed_official 216:577900467c9e 125 if (obj->spi == SPI_3) {
mbed_official 330:c80ac197fa6a 126 __SPI3_FORCE_RESET();
mbed_official 330:c80ac197fa6a 127 __SPI3_RELEASE_RESET();
mbed_official 330:c80ac197fa6a 128 __SPI3_CLK_DISABLE();
mbed_official 216:577900467c9e 129 }
mbed_official 216:577900467c9e 130
mbed_official 216:577900467c9e 131 // Configure GPIOs
mbed_official 330:c80ac197fa6a 132 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 330:c80ac197fa6a 133 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 330:c80ac197fa6a 134 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 330:c80ac197fa6a 135 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 125:23cc3068a9e4 136 }
mbed_official 125:23cc3068a9e4 137
mbed_official 330:c80ac197fa6a 138 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 330:c80ac197fa6a 139 {
mbed_official 125:23cc3068a9e4 140 // Save new values
mbed_official 233:1bbc1451db33 141 if (bits == 16) {
mbed_official 330:c80ac197fa6a 142 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 233:1bbc1451db33 143 } else {
mbed_official 330:c80ac197fa6a 144 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 125:23cc3068a9e4 145 }
mbed_official 135:067cc8ba23da 146
mbed_official 125:23cc3068a9e4 147 switch (mode) {
mbed_official 125:23cc3068a9e4 148 case 0:
mbed_official 330:c80ac197fa6a 149 obj->cpol = SPI_POLARITY_LOW;
mbed_official 330:c80ac197fa6a 150 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 135:067cc8ba23da 151 break;
mbed_official 125:23cc3068a9e4 152 case 1:
mbed_official 330:c80ac197fa6a 153 obj->cpol = SPI_POLARITY_LOW;
mbed_official 330:c80ac197fa6a 154 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 135:067cc8ba23da 155 break;
mbed_official 125:23cc3068a9e4 156 case 2:
mbed_official 330:c80ac197fa6a 157 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 330:c80ac197fa6a 158 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 135:067cc8ba23da 159 break;
mbed_official 125:23cc3068a9e4 160 default:
mbed_official 330:c80ac197fa6a 161 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 330:c80ac197fa6a 162 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 135:067cc8ba23da 163 break;
mbed_official 125:23cc3068a9e4 164 }
mbed_official 135:067cc8ba23da 165
mbed_official 125:23cc3068a9e4 166 if (slave == 0) {
mbed_official 330:c80ac197fa6a 167 obj->mode = SPI_MODE_MASTER;
mbed_official 330:c80ac197fa6a 168 obj->nss = SPI_NSS_SOFT;
mbed_official 135:067cc8ba23da 169 } else {
mbed_official 330:c80ac197fa6a 170 obj->mode = SPI_MODE_SLAVE;
mbed_official 330:c80ac197fa6a 171 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 330:c80ac197fa6a 172 }
mbed_official 330:c80ac197fa6a 173
mbed_official 330:c80ac197fa6a 174 init_spi(obj);
mbed_official 330:c80ac197fa6a 175 }
mbed_official 330:c80ac197fa6a 176
mbed_official 330:c80ac197fa6a 177 void spi_frequency(spi_t *obj, int hz)
mbed_official 330:c80ac197fa6a 178 {
mbed_official 330:c80ac197fa6a 179 // Values depend of APB1CLK : 32 MHz if HSI is used, 36 MHz if HSE is used
mbed_official 330:c80ac197fa6a 180 if (hz < 250000) {
mbed_official 330:c80ac197fa6a 181 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 125 kHz - 141 kHz
mbed_official 330:c80ac197fa6a 182 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 330:c80ac197fa6a 183 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 250 kHz - 280 kHz
mbed_official 330:c80ac197fa6a 184 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 330:c80ac197fa6a 185 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 500 kHz - 560 kHz
mbed_official 330:c80ac197fa6a 186 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 330:c80ac197fa6a 187 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz - 1.13 MHz
mbed_official 330:c80ac197fa6a 188 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 330:c80ac197fa6a 189 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2 MHz - 2.25 MHz
mbed_official 330:c80ac197fa6a 190 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 330:c80ac197fa6a 191 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 4 MHz - 4.5 MHz
mbed_official 330:c80ac197fa6a 192 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 330:c80ac197fa6a 193 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 8 MHz - 9 MHz
mbed_official 330:c80ac197fa6a 194 } else { // >= 16000000
mbed_official 330:c80ac197fa6a 195 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 16 MHz - 18 MHz
mbed_official 125:23cc3068a9e4 196 }
mbed_official 135:067cc8ba23da 197
mbed_official 125:23cc3068a9e4 198 init_spi(obj);
mbed_official 125:23cc3068a9e4 199 }
mbed_official 125:23cc3068a9e4 200
mbed_official 330:c80ac197fa6a 201 static inline int ssp_readable(spi_t *obj)
mbed_official 330:c80ac197fa6a 202 {
mbed_official 330:c80ac197fa6a 203 int status;
mbed_official 330:c80ac197fa6a 204 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 330:c80ac197fa6a 205 // Check if data is received
mbed_official 330:c80ac197fa6a 206 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 330:c80ac197fa6a 207 return status;
mbed_official 125:23cc3068a9e4 208 }
mbed_official 125:23cc3068a9e4 209
mbed_official 330:c80ac197fa6a 210 static inline int ssp_writeable(spi_t *obj)
mbed_official 330:c80ac197fa6a 211 {
mbed_official 125:23cc3068a9e4 212 int status;
mbed_official 330:c80ac197fa6a 213 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 330:c80ac197fa6a 214 // Check if data is transmitted
mbed_official 330:c80ac197fa6a 215 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 135:067cc8ba23da 216 return status;
mbed_official 125:23cc3068a9e4 217 }
mbed_official 125:23cc3068a9e4 218
mbed_official 330:c80ac197fa6a 219 static inline void ssp_write(spi_t *obj, int value)
mbed_official 330:c80ac197fa6a 220 {
mbed_official 135:067cc8ba23da 221 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 125:23cc3068a9e4 222 while (!ssp_writeable(obj));
mbed_official 330:c80ac197fa6a 223 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 330:c80ac197fa6a 224 // Force 8-bit access to the data register
mbed_official 330:c80ac197fa6a 225 uint8_t *p_spi_dr = 0;
mbed_official 330:c80ac197fa6a 226 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 330:c80ac197fa6a 227 *p_spi_dr = (uint8_t)value;
mbed_official 330:c80ac197fa6a 228 } else { // SPI_DATASIZE_16BIT
mbed_official 330:c80ac197fa6a 229 spi->DR = (uint16_t)value;
mbed_official 125:23cc3068a9e4 230 }
mbed_official 125:23cc3068a9e4 231 }
mbed_official 125:23cc3068a9e4 232
mbed_official 330:c80ac197fa6a 233 static inline int ssp_read(spi_t *obj)
mbed_official 330:c80ac197fa6a 234 {
mbed_official 135:067cc8ba23da 235 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 125:23cc3068a9e4 236 while (!ssp_readable(obj));
mbed_official 330:c80ac197fa6a 237 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 330:c80ac197fa6a 238 // Force 8-bit access to the data register
mbed_official 330:c80ac197fa6a 239 uint8_t *p_spi_dr = 0;
mbed_official 330:c80ac197fa6a 240 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 330:c80ac197fa6a 241 return (int)(*p_spi_dr);
mbed_official 135:067cc8ba23da 242 } else {
mbed_official 330:c80ac197fa6a 243 return (int)spi->DR;
mbed_official 125:23cc3068a9e4 244 }
mbed_official 125:23cc3068a9e4 245 }
mbed_official 125:23cc3068a9e4 246
mbed_official 330:c80ac197fa6a 247 static inline int ssp_busy(spi_t *obj)
mbed_official 330:c80ac197fa6a 248 {
mbed_official 125:23cc3068a9e4 249 int status;
mbed_official 330:c80ac197fa6a 250 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 330:c80ac197fa6a 251 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 125:23cc3068a9e4 252 return status;
mbed_official 125:23cc3068a9e4 253 }
mbed_official 125:23cc3068a9e4 254
mbed_official 330:c80ac197fa6a 255 int spi_master_write(spi_t *obj, int value)
mbed_official 330:c80ac197fa6a 256 {
mbed_official 125:23cc3068a9e4 257 ssp_write(obj, value);
mbed_official 125:23cc3068a9e4 258 return ssp_read(obj);
mbed_official 125:23cc3068a9e4 259 }
mbed_official 125:23cc3068a9e4 260
mbed_official 330:c80ac197fa6a 261 int spi_slave_receive(spi_t *obj)
mbed_official 330:c80ac197fa6a 262 {
mbed_official 233:1bbc1451db33 263 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 125:23cc3068a9e4 264 };
mbed_official 125:23cc3068a9e4 265
mbed_official 330:c80ac197fa6a 266 int spi_slave_read(spi_t *obj)
mbed_official 330:c80ac197fa6a 267 {
mbed_official 125:23cc3068a9e4 268 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 330:c80ac197fa6a 269 while (!ssp_readable(obj));
mbed_official 330:c80ac197fa6a 270 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 330:c80ac197fa6a 271 // Force 8-bit access to the data register
mbed_official 330:c80ac197fa6a 272 uint8_t *p_spi_dr = 0;
mbed_official 330:c80ac197fa6a 273 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 330:c80ac197fa6a 274 return (int)(*p_spi_dr);
mbed_official 135:067cc8ba23da 275 } else {
mbed_official 330:c80ac197fa6a 276 return (int)spi->DR;
mbed_official 125:23cc3068a9e4 277 }
mbed_official 125:23cc3068a9e4 278 }
mbed_official 125:23cc3068a9e4 279
mbed_official 330:c80ac197fa6a 280 void spi_slave_write(spi_t *obj, int value)
mbed_official 330:c80ac197fa6a 281 {
mbed_official 135:067cc8ba23da 282 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 135:067cc8ba23da 283 while (!ssp_writeable(obj));
mbed_official 330:c80ac197fa6a 284 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 330:c80ac197fa6a 285 // Force 8-bit access to the data register
mbed_official 330:c80ac197fa6a 286 uint8_t *p_spi_dr = 0;
mbed_official 330:c80ac197fa6a 287 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 330:c80ac197fa6a 288 *p_spi_dr = (uint8_t)value;
mbed_official 330:c80ac197fa6a 289 } else { // SPI_DATASIZE_16BIT
mbed_official 330:c80ac197fa6a 290 spi->DR = (uint16_t)value;
mbed_official 125:23cc3068a9e4 291 }
mbed_official 125:23cc3068a9e4 292 }
mbed_official 125:23cc3068a9e4 293
mbed_official 330:c80ac197fa6a 294 int spi_busy(spi_t *obj)
mbed_official 330:c80ac197fa6a 295 {
mbed_official 125:23cc3068a9e4 296 return ssp_busy(obj);
mbed_official 125:23cc3068a9e4 297 }
mbed_official 125:23cc3068a9e4 298
mbed_official 125:23cc3068a9e4 299 #endif