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_L152RE/spi_api.c@118:b44c45162f28, 2014-03-14 (annotated)

Committer:
mbed_official
Date:
Fri Mar 14 10:00:07 2014 +0000
Revision:
118:b44c45162f28
Parent:
84:f54042cbc282
Child:
129:0182c99221bc
Synchronized with git revision 7d88efe969a293d8fee496c7c1f902f359c40af8



Full URL: https://github.com/mbedmicro/mbed/commit/7d88efe969a293d8fee496c7c1f902f359c40af8/



Add additional peripherie for ST Nucleo L152 board

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 76:aeb1df146756 1 /* mbed Microcontroller Library
mbed_official 76:aeb1df146756 2 *******************************************************************************
mbed_official 76:aeb1df146756 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 76:aeb1df146756 4 * All rights reserved.
mbed_official 76:aeb1df146756 5 *
mbed_official 76:aeb1df146756 6 * Redistribution and use in source and binary forms, with or without
mbed_official 76:aeb1df146756 7 * modification, are permitted provided that the following conditions are met:
mbed_official 76:aeb1df146756 8 *
mbed_official 76:aeb1df146756 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 76:aeb1df146756 10 * this list of conditions and the following disclaimer.
mbed_official 76:aeb1df146756 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 76:aeb1df146756 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 76:aeb1df146756 13 * and/or other materials provided with the distribution.
mbed_official 76:aeb1df146756 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 76:aeb1df146756 15 * may be used to endorse or promote products derived from this software
mbed_official 76:aeb1df146756 16 * without specific prior written permission.
mbed_official 76:aeb1df146756 17 *
mbed_official 76:aeb1df146756 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 76:aeb1df146756 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 76:aeb1df146756 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 76:aeb1df146756 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 76:aeb1df146756 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 76:aeb1df146756 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 76:aeb1df146756 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 76:aeb1df146756 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 76:aeb1df146756 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 76:aeb1df146756 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 76:aeb1df146756 28 *******************************************************************************
mbed_official 76:aeb1df146756 29 */
mbed_official 76:aeb1df146756 30 #include "spi_api.h"
mbed_official 76:aeb1df146756 31
mbed_official 76:aeb1df146756 32 #if DEVICE_SPI
mbed_official 76:aeb1df146756 33
mbed_official 76:aeb1df146756 34 #include <math.h>
mbed_official 76:aeb1df146756 35 #include "cmsis.h"
mbed_official 76:aeb1df146756 36 #include "pinmap.h"
mbed_official 76:aeb1df146756 37 #include "error.h"
mbed_official 76:aeb1df146756 38
mbed_official 76:aeb1df146756 39 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 80:66393a7b209d 40 {PA_7, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 80:66393a7b209d 41 {PA_12, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)}, // REMAP
mbed_official 118:b44c45162f28 42 {PB_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)}, // REMAP2
mbed_official 118:b44c45162f28 43 {PB_15, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 118:b44c45162f28 44 {PB_5, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 118:b44c45162f28 45 {PC_12, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)}, // REMAP
mbed_official 118:b44c45162f28 46
mbed_official 76:aeb1df146756 47 {NC, NC, 0}
mbed_official 76:aeb1df146756 48 };
mbed_official 76:aeb1df146756 49
mbed_official 76:aeb1df146756 50 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 80:66393a7b209d 51 {PA_6, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 80:66393a7b209d 52 {PA_11, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)}, // REMAP
mbed_official 118:b44c45162f28 53 {PB_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)}, // REMAP2
mbed_official 118:b44c45162f28 54 {PA_6, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 118:b44c45162f28 55 {PB_14, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 118:b44c45162f28 56 {PB_4 , SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 118:b44c45162f28 57 {PC_11, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 76:aeb1df146756 58 {NC, NC, 0}
mbed_official 76:aeb1df146756 59 };
mbed_official 76:aeb1df146756 60
mbed_official 76:aeb1df146756 61 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 80:66393a7b209d 62 {PA_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 80:66393a7b209d 63 {PB_3, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)}, // REMAP
mbed_official 118:b44c45162f28 64 {PB_13, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 118:b44c45162f28 65 {PB_3, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 118:b44c45162f28 66 {PC_10, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 76:aeb1df146756 67 {NC, NC, 0}
mbed_official 76:aeb1df146756 68 };
mbed_official 76:aeb1df146756 69
mbed_official 76:aeb1df146756 70 // Only used in Slave mode
mbed_official 76:aeb1df146756 71 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 80:66393a7b209d 72 {PA_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 118:b44c45162f28 73 {PA_15, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)}, // REMAP
mbed_official 118:b44c45162f28 74 {PB_12, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 118:b44c45162f28 75 {PA_4 , SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 118:b44c45162f28 76 {PA_15, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 76:aeb1df146756 77 {NC, NC, 0}
mbed_official 76:aeb1df146756 78 };
mbed_official 76:aeb1df146756 79
mbed_official 76:aeb1df146756 80 static void init_spi(spi_t *obj) {
mbed_official 76:aeb1df146756 81 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 82 SPI_InitTypeDef SPI_InitStructure;
mbed_official 76:aeb1df146756 83
mbed_official 76:aeb1df146756 84 SPI_Cmd(spi, DISABLE);
mbed_official 76:aeb1df146756 85
mbed_official 76:aeb1df146756 86 SPI_InitStructure.SPI_Mode = obj->mode;
mbed_official 76:aeb1df146756 87 SPI_InitStructure.SPI_NSS = obj->nss;
mbed_official 76:aeb1df146756 88 SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
mbed_official 76:aeb1df146756 89 SPI_InitStructure.SPI_DataSize = obj->bits;
mbed_official 76:aeb1df146756 90 SPI_InitStructure.SPI_CPOL = obj->cpol;
mbed_official 76:aeb1df146756 91 SPI_InitStructure.SPI_CPHA = obj->cpha;
mbed_official 76:aeb1df146756 92 SPI_InitStructure.SPI_BaudRatePrescaler = obj->br_presc;
mbed_official 76:aeb1df146756 93 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
mbed_official 76:aeb1df146756 94 SPI_InitStructure.SPI_CRCPolynomial = 7;
mbed_official 76:aeb1df146756 95 SPI_Init(spi, &SPI_InitStructure);
mbed_official 76:aeb1df146756 96
mbed_official 76:aeb1df146756 97 SPI_Cmd(spi, ENABLE);
mbed_official 76:aeb1df146756 98 }
mbed_official 76:aeb1df146756 99
mbed_official 76:aeb1df146756 100 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 76:aeb1df146756 101 // Determine the SPI to use
mbed_official 76:aeb1df146756 102 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 76:aeb1df146756 103 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 76:aeb1df146756 104 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 76:aeb1df146756 105 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 76:aeb1df146756 106
mbed_official 76:aeb1df146756 107 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 76:aeb1df146756 108 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 76:aeb1df146756 109
mbed_official 76:aeb1df146756 110 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 76:aeb1df146756 111
mbed_official 76:aeb1df146756 112 if (obj->spi == (SPIName)NC) {
mbed_official 76:aeb1df146756 113 error("SPI pinout mapping failed");
mbed_official 76:aeb1df146756 114 }
mbed_official 76:aeb1df146756 115
mbed_official 76:aeb1df146756 116 // Enable SPI clock
mbed_official 76:aeb1df146756 117 if (obj->spi == SPI_1) {
mbed_official 76:aeb1df146756 118 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 76:aeb1df146756 119 }
mbed_official 76:aeb1df146756 120 if (obj->spi == SPI_2) {
mbed_official 76:aeb1df146756 121 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 76:aeb1df146756 122 }
mbed_official 118:b44c45162f28 123 if (obj->spi == SPI_3) {
mbed_official 118:b44c45162f28 124 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
mbed_official 118:b44c45162f28 125 }
mbed_official 76:aeb1df146756 126
mbed_official 76:aeb1df146756 127 // Configure the SPI pins
mbed_official 76:aeb1df146756 128 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 76:aeb1df146756 129 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 76:aeb1df146756 130 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 76:aeb1df146756 131
mbed_official 76:aeb1df146756 132 // Save new values
mbed_official 76:aeb1df146756 133 obj->bits = SPI_DataSize_8b;
mbed_official 76:aeb1df146756 134 obj->cpol = SPI_CPOL_Low;
mbed_official 76:aeb1df146756 135 obj->cpha = SPI_CPHA_1Edge;
mbed_official 84:f54042cbc282 136 obj->br_presc = SPI_BaudRatePrescaler_16; // 1 MHz
mbed_official 76:aeb1df146756 137
mbed_official 76:aeb1df146756 138 if (ssel == NC) { // Master
mbed_official 76:aeb1df146756 139 obj->mode = SPI_Mode_Master;
mbed_official 76:aeb1df146756 140 obj->nss = SPI_NSS_Soft;
mbed_official 76:aeb1df146756 141 }
mbed_official 76:aeb1df146756 142 else { // Slave
mbed_official 76:aeb1df146756 143 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 76:aeb1df146756 144 obj->mode = SPI_Mode_Slave;
mbed_official 76:aeb1df146756 145 obj->nss = SPI_NSS_Soft;
mbed_official 76:aeb1df146756 146 }
mbed_official 76:aeb1df146756 147
mbed_official 76:aeb1df146756 148 init_spi(obj);
mbed_official 76:aeb1df146756 149 }
mbed_official 76:aeb1df146756 150
mbed_official 76:aeb1df146756 151 void spi_free(spi_t *obj) {
mbed_official 76:aeb1df146756 152 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 153 SPI_I2S_DeInit(spi);
mbed_official 76:aeb1df146756 154 }
mbed_official 76:aeb1df146756 155
mbed_official 76:aeb1df146756 156 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 76:aeb1df146756 157 // Save new values
mbed_official 76:aeb1df146756 158 if (bits == 8) {
mbed_official 76:aeb1df146756 159 obj->bits = SPI_DataSize_8b;
mbed_official 76:aeb1df146756 160 }
mbed_official 76:aeb1df146756 161 else {
mbed_official 76:aeb1df146756 162 obj->bits = SPI_DataSize_16b;
mbed_official 76:aeb1df146756 163 }
mbed_official 76:aeb1df146756 164
mbed_official 76:aeb1df146756 165 switch (mode) {
mbed_official 76:aeb1df146756 166 case 0:
mbed_official 76:aeb1df146756 167 obj->cpol = SPI_CPOL_Low;
mbed_official 76:aeb1df146756 168 obj->cpha = SPI_CPHA_1Edge;
mbed_official 76:aeb1df146756 169 break;
mbed_official 76:aeb1df146756 170 case 1:
mbed_official 76:aeb1df146756 171 obj->cpol = SPI_CPOL_Low;
mbed_official 76:aeb1df146756 172 obj->cpha = SPI_CPHA_2Edge;
mbed_official 76:aeb1df146756 173 break;
mbed_official 76:aeb1df146756 174 case 2:
mbed_official 76:aeb1df146756 175 obj->cpol = SPI_CPOL_High;
mbed_official 76:aeb1df146756 176 obj->cpha = SPI_CPHA_1Edge;
mbed_official 76:aeb1df146756 177 break;
mbed_official 76:aeb1df146756 178 default:
mbed_official 76:aeb1df146756 179 obj->cpol = SPI_CPOL_High;
mbed_official 76:aeb1df146756 180 obj->cpha = SPI_CPHA_2Edge;
mbed_official 76:aeb1df146756 181 break;
mbed_official 76:aeb1df146756 182 }
mbed_official 76:aeb1df146756 183
mbed_official 76:aeb1df146756 184 if (slave == 0) {
mbed_official 76:aeb1df146756 185 obj->mode = SPI_Mode_Master;
mbed_official 76:aeb1df146756 186 obj->nss = SPI_NSS_Soft;
mbed_official 76:aeb1df146756 187 }
mbed_official 76:aeb1df146756 188 else {
mbed_official 76:aeb1df146756 189 obj->mode = SPI_Mode_Slave;
mbed_official 76:aeb1df146756 190 obj->nss = SPI_NSS_Hard;
mbed_official 76:aeb1df146756 191 }
mbed_official 76:aeb1df146756 192
mbed_official 76:aeb1df146756 193 init_spi(obj);
mbed_official 76:aeb1df146756 194 }
mbed_official 76:aeb1df146756 195
mbed_official 76:aeb1df146756 196 void spi_frequency(spi_t *obj, int hz) {
mbed_official 76:aeb1df146756 197 // Get SPI clock frequency
mbed_official 84:f54042cbc282 198 uint32_t PCLK = SystemCoreClock;
mbed_official 76:aeb1df146756 199
mbed_official 76:aeb1df146756 200 // Choose the baud rate divisor (between 2 and 256)
mbed_official 76:aeb1df146756 201 uint32_t divisor = PCLK / hz;
mbed_official 76:aeb1df146756 202
mbed_official 76:aeb1df146756 203 // Find the nearest power-of-2
mbed_official 76:aeb1df146756 204 divisor = (divisor > 0 ? divisor-1 : 0);
mbed_official 76:aeb1df146756 205 divisor |= divisor >> 1;
mbed_official 76:aeb1df146756 206 divisor |= divisor >> 2;
mbed_official 76:aeb1df146756 207 divisor |= divisor >> 4;
mbed_official 76:aeb1df146756 208 divisor |= divisor >> 8;
mbed_official 76:aeb1df146756 209 divisor |= divisor >> 16;
mbed_official 76:aeb1df146756 210 divisor++;
mbed_official 76:aeb1df146756 211
mbed_official 76:aeb1df146756 212 uint32_t baud_rate = __builtin_ffs(divisor) - 2;
mbed_official 76:aeb1df146756 213
mbed_official 76:aeb1df146756 214 // Save new value
mbed_official 76:aeb1df146756 215 obj->br_presc = ((baud_rate > 7) ? (7 << 3) : (baud_rate << 3));
mbed_official 76:aeb1df146756 216
mbed_official 76:aeb1df146756 217 init_spi(obj);
mbed_official 76:aeb1df146756 218 }
mbed_official 76:aeb1df146756 219
mbed_official 76:aeb1df146756 220 static inline int ssp_readable(spi_t *obj) {
mbed_official 76:aeb1df146756 221 int status;
mbed_official 76:aeb1df146756 222 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 223 // Check if data is received
mbed_official 76:aeb1df146756 224 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 225 return status;
mbed_official 76:aeb1df146756 226 }
mbed_official 76:aeb1df146756 227
mbed_official 76:aeb1df146756 228 static inline int ssp_writeable(spi_t *obj) {
mbed_official 76:aeb1df146756 229 int status;
mbed_official 76:aeb1df146756 230 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 231 // Check if data is transmitted
mbed_official 76:aeb1df146756 232 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 233 return status;
mbed_official 76:aeb1df146756 234 }
mbed_official 76:aeb1df146756 235
mbed_official 76:aeb1df146756 236 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 237 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 238 while (!ssp_writeable(obj));
mbed_official 76:aeb1df146756 239 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 76:aeb1df146756 240 }
mbed_official 76:aeb1df146756 241
mbed_official 76:aeb1df146756 242 static inline int ssp_read(spi_t *obj) {
mbed_official 76:aeb1df146756 243 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 244 while (!ssp_readable(obj));
mbed_official 76:aeb1df146756 245 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 76:aeb1df146756 246 }
mbed_official 76:aeb1df146756 247
mbed_official 76:aeb1df146756 248 static inline int ssp_busy(spi_t *obj) {
mbed_official 76:aeb1df146756 249 int status;
mbed_official 76:aeb1df146756 250 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 251 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 252 return status;
mbed_official 76:aeb1df146756 253 }
mbed_official 76:aeb1df146756 254
mbed_official 76:aeb1df146756 255 int spi_master_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 256 ssp_write(obj, value);
mbed_official 76:aeb1df146756 257 return ssp_read(obj);
mbed_official 76:aeb1df146756 258 }
mbed_official 76:aeb1df146756 259
mbed_official 76:aeb1df146756 260 int spi_slave_receive(spi_t *obj) {
mbed_official 76:aeb1df146756 261 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 76:aeb1df146756 262 };
mbed_official 76:aeb1df146756 263
mbed_official 76:aeb1df146756 264 int spi_slave_read(spi_t *obj) {
mbed_official 76:aeb1df146756 265 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 266 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 76:aeb1df146756 267 }
mbed_official 76:aeb1df146756 268
mbed_official 76:aeb1df146756 269 void spi_slave_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 270 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 271 while (!ssp_writeable(obj));
mbed_official 76:aeb1df146756 272 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 76:aeb1df146756 273 }
mbed_official 76:aeb1df146756 274
mbed_official 76:aeb1df146756 275 int spi_busy(spi_t *obj) {
mbed_official 76:aeb1df146756 276 return ssp_busy(obj);
mbed_official 76:aeb1df146756 277 }
mbed_official 76:aeb1df146756 278
mbed_official 76:aeb1df146756 279 #endif