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_F103RB/spi_api.c@181:a4cbdfbbd2f4, 2014-05-07 (annotated)

Committer:
mbed_official
Date:
Wed May 07 13:15:08 2014 +0100
Revision:
181:a4cbdfbbd2f4
Parent:
174:8bb9f3a33240
Child:
208:4557f4bb2dd5
Synchronized with git revision 7751e759576c6fd68deccb81ea82bac19ed41745



Full URL: https://github.com/mbedmicro/mbed/commit/7751e759576c6fd68deccb81ea82bac19ed41745/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 52:a51c77007319 1 /* mbed Microcontroller Library
mbed_official 70:c1fbde68b492 2 *******************************************************************************
mbed_official 70:c1fbde68b492 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 70:c1fbde68b492 4 * All rights reserved.
mbed_official 52:a51c77007319 5 *
mbed_official 70:c1fbde68b492 6 * Redistribution and use in source and binary forms, with or without
mbed_official 70:c1fbde68b492 7 * modification, are permitted provided that the following conditions are met:
mbed_official 52:a51c77007319 8 *
mbed_official 70:c1fbde68b492 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 70:c1fbde68b492 10 * this list of conditions and the following disclaimer.
mbed_official 70:c1fbde68b492 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 70:c1fbde68b492 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 70:c1fbde68b492 13 * and/or other materials provided with the distribution.
mbed_official 70:c1fbde68b492 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 70:c1fbde68b492 15 * may be used to endorse or promote products derived from this software
mbed_official 70:c1fbde68b492 16 * without specific prior written permission.
mbed_official 52:a51c77007319 17 *
mbed_official 70:c1fbde68b492 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 70:c1fbde68b492 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 70:c1fbde68b492 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 70:c1fbde68b492 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 70:c1fbde68b492 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 70:c1fbde68b492 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 70:c1fbde68b492 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 70:c1fbde68b492 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 70:c1fbde68b492 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 70:c1fbde68b492 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 70:c1fbde68b492 28 *******************************************************************************
mbed_official 52:a51c77007319 29 */
mbed_official 52:a51c77007319 30 #include "spi_api.h"
mbed_official 52:a51c77007319 31
mbed_official 52:a51c77007319 32 #if DEVICE_SPI
mbed_official 52:a51c77007319 33
mbed_official 52:a51c77007319 34 #include <math.h>
mbed_official 52:a51c77007319 35 #include "cmsis.h"
mbed_official 52:a51c77007319 36 #include "pinmap.h"
mbed_official 52:a51c77007319 37 #include "error.h"
mbed_official 52:a51c77007319 38
mbed_official 52:a51c77007319 39 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 52:a51c77007319 40 {PA_7, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 139:e3413eddde57 41 {PB_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 1)}, // GPIO_Remap_SPI1
mbed_official 139:e3413eddde57 42 {PB_15, SPI_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 52:a51c77007319 43 {NC, NC, 0}
mbed_official 52:a51c77007319 44 };
mbed_official 52:a51c77007319 45
mbed_official 52:a51c77007319 46 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 52:a51c77007319 47 {PA_6, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 139:e3413eddde57 48 {PB_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 1)}, // GPIO_Remap_SPI1
mbed_official 139:e3413eddde57 49 {PB_14, SPI_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 52:a51c77007319 50 {NC, NC, 0}
mbed_official 52:a51c77007319 51 };
mbed_official 52:a51c77007319 52
mbed_official 52:a51c77007319 53 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 52:a51c77007319 54 {PA_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 139:e3413eddde57 55 {PB_3, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 1)}, // GPIO_Remap_SPI1
mbed_official 139:e3413eddde57 56 {PB_13, SPI_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 52:a51c77007319 57 {NC, NC, 0}
mbed_official 52:a51c77007319 58 };
mbed_official 52:a51c77007319 59
mbed_official 52:a51c77007319 60 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 139:e3413eddde57 61 {PA_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 139:e3413eddde57 62 {PA_15, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 1)}, // GPIO_Remap_SPI1
mbed_official 139:e3413eddde57 63 {PB_12, SPI_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 52:a51c77007319 64 {NC, NC, 0}
mbed_official 52:a51c77007319 65 };
mbed_official 52:a51c77007319 66
mbed_official 56:99eb381a3269 67 static void init_spi(spi_t *obj) {
mbed_official 56:99eb381a3269 68 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 56:99eb381a3269 69 SPI_InitTypeDef SPI_InitStructure;
mbed_official 56:99eb381a3269 70
mbed_official 56:99eb381a3269 71 SPI_Cmd(spi, DISABLE);
mbed_official 52:a51c77007319 72
mbed_official 139:e3413eddde57 73 SPI_InitStructure.SPI_Mode = obj->mode;
mbed_official 139:e3413eddde57 74 SPI_InitStructure.SPI_NSS = obj->nss;
mbed_official 174:8bb9f3a33240 75 SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
mbed_official 139:e3413eddde57 76 SPI_InitStructure.SPI_DataSize = obj->bits;
mbed_official 139:e3413eddde57 77 SPI_InitStructure.SPI_CPOL = obj->cpol;
mbed_official 139:e3413eddde57 78 SPI_InitStructure.SPI_CPHA = obj->cpha;
mbed_official 56:99eb381a3269 79 SPI_InitStructure.SPI_BaudRatePrescaler = obj->br_presc;
mbed_official 139:e3413eddde57 80 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
mbed_official 139:e3413eddde57 81 SPI_InitStructure.SPI_CRCPolynomial = 7;
mbed_official 56:99eb381a3269 82 SPI_Init(spi, &SPI_InitStructure);
mbed_official 56:99eb381a3269 83
mbed_official 56:99eb381a3269 84 SPI_Cmd(spi, ENABLE);
mbed_official 56:99eb381a3269 85 }
mbed_official 56:99eb381a3269 86
mbed_official 56:99eb381a3269 87 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 52:a51c77007319 88 // Determine the SPI to use
mbed_official 52:a51c77007319 89 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 52:a51c77007319 90 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 52:a51c77007319 91 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 52:a51c77007319 92 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 174:8bb9f3a33240 93
mbed_official 52:a51c77007319 94 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 52:a51c77007319 95 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 174:8bb9f3a33240 96
mbed_official 52:a51c77007319 97 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 174:8bb9f3a33240 98
mbed_official 52:a51c77007319 99 if (obj->spi == (SPIName)NC) {
mbed_official 52:a51c77007319 100 error("SPI pinout mapping failed");
mbed_official 52:a51c77007319 101 }
mbed_official 174:8bb9f3a33240 102
mbed_official 52:a51c77007319 103 // Enable SPI clock
mbed_official 52:a51c77007319 104 if (obj->spi == SPI_1) {
mbed_official 174:8bb9f3a33240 105 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 52:a51c77007319 106 }
mbed_official 139:e3413eddde57 107 if (obj->spi == SPI_2) {
mbed_official 139:e3413eddde57 108 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 139:e3413eddde57 109 }
mbed_official 139:e3413eddde57 110
mbed_official 52:a51c77007319 111 // Configure the SPI pins
mbed_official 52:a51c77007319 112 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 52:a51c77007319 113 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 52:a51c77007319 114 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 174:8bb9f3a33240 115
mbed_official 52:a51c77007319 116 // Save new values
mbed_official 52:a51c77007319 117 obj->bits = SPI_DataSize_8b;
mbed_official 52:a51c77007319 118 obj->cpol = SPI_CPOL_Low;
mbed_official 52:a51c77007319 119 obj->cpha = SPI_CPHA_1Edge;
mbed_official 139:e3413eddde57 120 obj->br_presc = SPI_BaudRatePrescaler_256;
mbed_official 174:8bb9f3a33240 121
mbed_official 52:a51c77007319 122 if (ssel == NC) { // Master
mbed_official 52:a51c77007319 123 obj->mode = SPI_Mode_Master;
mbed_official 52:a51c77007319 124 obj->nss = SPI_NSS_Soft;
mbed_official 174:8bb9f3a33240 125 } else { // Slave
mbed_official 52:a51c77007319 126 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 52:a51c77007319 127 obj->mode = SPI_Mode_Slave;
mbed_official 181:a4cbdfbbd2f4 128 obj->nss = SPI_NSS_Hard;
mbed_official 52:a51c77007319 129 }
mbed_official 52:a51c77007319 130
mbed_official 56:99eb381a3269 131 init_spi(obj);
mbed_official 52:a51c77007319 132 }
mbed_official 52:a51c77007319 133
mbed_official 52:a51c77007319 134 void spi_free(spi_t *obj) {
mbed_official 52:a51c77007319 135 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 136 SPI_I2S_DeInit(spi);
mbed_official 52:a51c77007319 137 }
mbed_official 52:a51c77007319 138
mbed_official 174:8bb9f3a33240 139 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 52:a51c77007319 140 // Save new values
mbed_official 52:a51c77007319 141 if (bits == 8) {
mbed_official 52:a51c77007319 142 obj->bits = SPI_DataSize_8b;
mbed_official 174:8bb9f3a33240 143 } else {
mbed_official 52:a51c77007319 144 obj->bits = SPI_DataSize_16b;
mbed_official 52:a51c77007319 145 }
mbed_official 174:8bb9f3a33240 146
mbed_official 52:a51c77007319 147 switch (mode) {
mbed_official 52:a51c77007319 148 case 0:
mbed_official 174:8bb9f3a33240 149 obj->cpol = SPI_CPOL_Low;
mbed_official 174:8bb9f3a33240 150 obj->cpha = SPI_CPHA_1Edge;
mbed_official 174:8bb9f3a33240 151 break;
mbed_official 52:a51c77007319 152 case 1:
mbed_official 174:8bb9f3a33240 153 obj->cpol = SPI_CPOL_Low;
mbed_official 174:8bb9f3a33240 154 obj->cpha = SPI_CPHA_2Edge;
mbed_official 174:8bb9f3a33240 155 break;
mbed_official 52:a51c77007319 156 case 2:
mbed_official 174:8bb9f3a33240 157 obj->cpol = SPI_CPOL_High;
mbed_official 174:8bb9f3a33240 158 obj->cpha = SPI_CPHA_1Edge;
mbed_official 174:8bb9f3a33240 159 break;
mbed_official 52:a51c77007319 160 default:
mbed_official 174:8bb9f3a33240 161 obj->cpol = SPI_CPOL_High;
mbed_official 174:8bb9f3a33240 162 obj->cpha = SPI_CPHA_2Edge;
mbed_official 174:8bb9f3a33240 163 break;
mbed_official 52:a51c77007319 164 }
mbed_official 174:8bb9f3a33240 165
mbed_official 52:a51c77007319 166 if (slave == 0) {
mbed_official 52:a51c77007319 167 obj->mode = SPI_Mode_Master;
mbed_official 52:a51c77007319 168 obj->nss = SPI_NSS_Soft;
mbed_official 174:8bb9f3a33240 169 } else {
mbed_official 52:a51c77007319 170 obj->mode = SPI_Mode_Slave;
mbed_official 174:8bb9f3a33240 171 obj->nss = SPI_NSS_Hard;
mbed_official 52:a51c77007319 172 }
mbed_official 174:8bb9f3a33240 173
mbed_official 56:99eb381a3269 174 init_spi(obj);
mbed_official 52:a51c77007319 175 }
mbed_official 52:a51c77007319 176
mbed_official 52:a51c77007319 177 void spi_frequency(spi_t *obj, int hz) {
mbed_official 139:e3413eddde57 178 if (obj->spi == SPI_1) {
mbed_official 139:e3413eddde57 179 // Values depend of PCLK2: 64 MHz if HSI is used, 72 MHz if HSE is used
mbed_official 139:e3413eddde57 180 if (hz < 500000) {
mbed_official 139:e3413eddde57 181 obj->br_presc = SPI_BaudRatePrescaler_256; // 250 kHz - 281 kHz
mbed_official 174:8bb9f3a33240 182 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 183 obj->br_presc = SPI_BaudRatePrescaler_128; // 500 kHz - 563 kHz
mbed_official 174:8bb9f3a33240 184 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 139:e3413eddde57 185 obj->br_presc = SPI_BaudRatePrescaler_64; // 1 MHz - 1.13 MHz
mbed_official 174:8bb9f3a33240 186 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 139:e3413eddde57 187 obj->br_presc = SPI_BaudRatePrescaler_32; // 2 MHz - 2.25 MHz
mbed_official 174:8bb9f3a33240 188 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 139:e3413eddde57 189 obj->br_presc = SPI_BaudRatePrescaler_16; // 4 MHz - 4.5 MHz
mbed_official 174:8bb9f3a33240 190 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 139:e3413eddde57 191 obj->br_presc = SPI_BaudRatePrescaler_8; // 8 MHz - 9 MHz
mbed_official 174:8bb9f3a33240 192 } else if ((hz >= 16000000) && (hz < 32000000)) {
mbed_official 139:e3413eddde57 193 obj->br_presc = SPI_BaudRatePrescaler_4; // 16 MHz - 18 MHz
mbed_official 174:8bb9f3a33240 194 } else { // >= 32000000
mbed_official 139:e3413eddde57 195 obj->br_presc = SPI_BaudRatePrescaler_2; // 32 MHz - 36 MHz
mbed_official 139:e3413eddde57 196 }
mbed_official 139:e3413eddde57 197 }
mbed_official 174:8bb9f3a33240 198
mbed_official 139:e3413eddde57 199 if (obj->spi == SPI_2) {
mbed_official 139:e3413eddde57 200 // Values depend of PCLK1: 32 MHz if HSI is used, 36 MHz if HSE is used
mbed_official 139:e3413eddde57 201 if (hz < 250000) {
mbed_official 139:e3413eddde57 202 obj->br_presc = SPI_BaudRatePrescaler_256; // 125 kHz - 141 kHz
mbed_official 174:8bb9f3a33240 203 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 139:e3413eddde57 204 obj->br_presc = SPI_BaudRatePrescaler_128; // 250 kHz - 281 kHz
mbed_official 174:8bb9f3a33240 205 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 206 obj->br_presc = SPI_BaudRatePrescaler_64; // 500 kHz - 563 kHz
mbed_official 174:8bb9f3a33240 207 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 139:e3413eddde57 208 obj->br_presc = SPI_BaudRatePrescaler_32; // 1 MHz - 1.13 MHz
mbed_official 174:8bb9f3a33240 209 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 139:e3413eddde57 210 obj->br_presc = SPI_BaudRatePrescaler_16; // 2 MHz - 2.25 MHz
mbed_official 174:8bb9f3a33240 211 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 139:e3413eddde57 212 obj->br_presc = SPI_BaudRatePrescaler_8; // 4 MHz - 4.5 MHz
mbed_official 174:8bb9f3a33240 213 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 139:e3413eddde57 214 obj->br_presc = SPI_BaudRatePrescaler_4; // 8 MHz - 9 MHz
mbed_official 174:8bb9f3a33240 215 } else { // >= 16000000
mbed_official 139:e3413eddde57 216 obj->br_presc = SPI_BaudRatePrescaler_2; // 16 MHz - 18 MHz
mbed_official 139:e3413eddde57 217 }
mbed_official 139:e3413eddde57 218 }
mbed_official 52:a51c77007319 219
mbed_official 56:99eb381a3269 220 init_spi(obj);
mbed_official 52:a51c77007319 221 }
mbed_official 52:a51c77007319 222
mbed_official 52:a51c77007319 223 static inline int ssp_readable(spi_t *obj) {
mbed_official 52:a51c77007319 224 int status;
mbed_official 52:a51c77007319 225 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 226 // Check if data is received
mbed_official 52:a51c77007319 227 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 174:8bb9f3a33240 228 return status;
mbed_official 52:a51c77007319 229 }
mbed_official 52:a51c77007319 230
mbed_official 52:a51c77007319 231 static inline int ssp_writeable(spi_t *obj) {
mbed_official 52:a51c77007319 232 int status;
mbed_official 52:a51c77007319 233 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 234 // Check if data is transmitted
mbed_official 52:a51c77007319 235 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 52:a51c77007319 236 return status;
mbed_official 52:a51c77007319 237 }
mbed_official 52:a51c77007319 238
mbed_official 52:a51c77007319 239 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 174:8bb9f3a33240 240 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 241 while (!ssp_writeable(obj));
mbed_official 52:a51c77007319 242 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 52:a51c77007319 243 }
mbed_official 52:a51c77007319 244
mbed_official 52:a51c77007319 245 static inline int ssp_read(spi_t *obj) {
mbed_official 174:8bb9f3a33240 246 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 247 while (!ssp_readable(obj));
mbed_official 52:a51c77007319 248 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 52:a51c77007319 249 }
mbed_official 52:a51c77007319 250
mbed_official 52:a51c77007319 251 static inline int ssp_busy(spi_t *obj) {
mbed_official 52:a51c77007319 252 int status;
mbed_official 52:a51c77007319 253 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 254 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 52:a51c77007319 255 return status;
mbed_official 52:a51c77007319 256 }
mbed_official 52:a51c77007319 257
mbed_official 52:a51c77007319 258 int spi_master_write(spi_t *obj, int value) {
mbed_official 52:a51c77007319 259 ssp_write(obj, value);
mbed_official 52:a51c77007319 260 return ssp_read(obj);
mbed_official 52:a51c77007319 261 }
mbed_official 52:a51c77007319 262
mbed_official 52:a51c77007319 263 int spi_slave_receive(spi_t *obj) {
mbed_official 52:a51c77007319 264 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 52:a51c77007319 265 };
mbed_official 52:a51c77007319 266
mbed_official 52:a51c77007319 267 int spi_slave_read(spi_t *obj) {
mbed_official 52:a51c77007319 268 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 269 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 52:a51c77007319 270 }
mbed_official 52:a51c77007319 271
mbed_official 52:a51c77007319 272 void spi_slave_write(spi_t *obj, int value) {
mbed_official 174:8bb9f3a33240 273 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 174:8bb9f3a33240 274 while (!ssp_writeable(obj));
mbed_official 52:a51c77007319 275 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 52:a51c77007319 276 }
mbed_official 52:a51c77007319 277
mbed_official 52:a51c77007319 278 int spi_busy(spi_t *obj) {
mbed_official 52:a51c77007319 279 return ssp_busy(obj);
mbed_official 52:a51c77007319 280 }
mbed_official 52:a51c77007319 281
mbed_official 52:a51c77007319 282 #endif