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@129:0182c99221bc, 2014-03-20 (annotated)

Committer:
mbed_official
Date:
Thu Mar 20 11:45:07 2014 +0000
Revision:
129:0182c99221bc
Parent:
118:b44c45162f28
Child:
139:e3413eddde57
Synchronized with git revision 93e44fb5a5aa010177943aaaec0126ed8b8e014d



Full URL: https://github.com/mbedmicro/mbed/commit/93e44fb5a5aa010177943aaaec0126ed8b8e014d/



[NUCLEO_F302R8] and [NUCLEO_L152RE] updates

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 129:0182c99221bc 41 {PA_12, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 42 {PB_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 43 //{PB_5, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 129:0182c99221bc 44 {PB_15, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 129:0182c99221bc 45 {PC_12, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 76:aeb1df146756 46 {NC, NC, 0}
mbed_official 76:aeb1df146756 47 };
mbed_official 76:aeb1df146756 48
mbed_official 76:aeb1df146756 49 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 80:66393a7b209d 50 {PA_6, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 51 {PA_11, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 52 {PB_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 53 //{PB_4, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 118:b44c45162f28 54 {PB_14, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 118:b44c45162f28 55 {PC_11, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 76:aeb1df146756 56 {NC, NC, 0}
mbed_official 76:aeb1df146756 57 };
mbed_official 76:aeb1df146756 58
mbed_official 76:aeb1df146756 59 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 80:66393a7b209d 60 {PA_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 61 {PB_3, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 62 //{PB_3, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 118:b44c45162f28 63 {PB_13, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 118:b44c45162f28 64 {PC_10, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 76:aeb1df146756 65 {NC, NC, 0}
mbed_official 76:aeb1df146756 66 };
mbed_official 76:aeb1df146756 67
mbed_official 76:aeb1df146756 68 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 129:0182c99221bc 69 {PA_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 70 //{PA_4, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 129:0182c99221bc 71 {PA_15, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 72 //{PA_15, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 118:b44c45162f28 73 {PB_12, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 76:aeb1df146756 74 {NC, NC, 0}
mbed_official 76:aeb1df146756 75 };
mbed_official 76:aeb1df146756 76
mbed_official 76:aeb1df146756 77 static void init_spi(spi_t *obj) {
mbed_official 76:aeb1df146756 78 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 79 SPI_InitTypeDef SPI_InitStructure;
mbed_official 76:aeb1df146756 80
mbed_official 76:aeb1df146756 81 SPI_Cmd(spi, DISABLE);
mbed_official 76:aeb1df146756 82
mbed_official 129:0182c99221bc 83 SPI_InitStructure.SPI_Mode = obj->mode;
mbed_official 129:0182c99221bc 84 SPI_InitStructure.SPI_NSS = obj->nss;
mbed_official 129:0182c99221bc 85 SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
mbed_official 129:0182c99221bc 86 SPI_InitStructure.SPI_DataSize = obj->bits;
mbed_official 129:0182c99221bc 87 SPI_InitStructure.SPI_CPOL = obj->cpol;
mbed_official 129:0182c99221bc 88 SPI_InitStructure.SPI_CPHA = obj->cpha;
mbed_official 76:aeb1df146756 89 SPI_InitStructure.SPI_BaudRatePrescaler = obj->br_presc;
mbed_official 129:0182c99221bc 90 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
mbed_official 129:0182c99221bc 91 SPI_InitStructure.SPI_CRCPolynomial = 7;
mbed_official 76:aeb1df146756 92 SPI_Init(spi, &SPI_InitStructure);
mbed_official 76:aeb1df146756 93
mbed_official 76:aeb1df146756 94 SPI_Cmd(spi, ENABLE);
mbed_official 76:aeb1df146756 95 }
mbed_official 76:aeb1df146756 96
mbed_official 76:aeb1df146756 97 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 76:aeb1df146756 98 // Determine the SPI to use
mbed_official 76:aeb1df146756 99 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 76:aeb1df146756 100 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 76:aeb1df146756 101 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 76:aeb1df146756 102 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 76:aeb1df146756 103
mbed_official 76:aeb1df146756 104 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 76:aeb1df146756 105 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 76:aeb1df146756 106
mbed_official 76:aeb1df146756 107 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 76:aeb1df146756 108
mbed_official 76:aeb1df146756 109 if (obj->spi == (SPIName)NC) {
mbed_official 76:aeb1df146756 110 error("SPI pinout mapping failed");
mbed_official 76:aeb1df146756 111 }
mbed_official 76:aeb1df146756 112
mbed_official 76:aeb1df146756 113 // Enable SPI clock
mbed_official 76:aeb1df146756 114 if (obj->spi == SPI_1) {
mbed_official 76:aeb1df146756 115 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 76:aeb1df146756 116 }
mbed_official 76:aeb1df146756 117 if (obj->spi == SPI_2) {
mbed_official 76:aeb1df146756 118 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 76:aeb1df146756 119 }
mbed_official 118:b44c45162f28 120 if (obj->spi == SPI_3) {
mbed_official 118:b44c45162f28 121 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
mbed_official 118:b44c45162f28 122 }
mbed_official 76:aeb1df146756 123
mbed_official 76:aeb1df146756 124 // Configure the SPI pins
mbed_official 76:aeb1df146756 125 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 76:aeb1df146756 126 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 76:aeb1df146756 127 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 76:aeb1df146756 128
mbed_official 76:aeb1df146756 129 // Save new values
mbed_official 76:aeb1df146756 130 obj->bits = SPI_DataSize_8b;
mbed_official 76:aeb1df146756 131 obj->cpol = SPI_CPOL_Low;
mbed_official 76:aeb1df146756 132 obj->cpha = SPI_CPHA_1Edge;
mbed_official 129:0182c99221bc 133 obj->br_presc = SPI_BaudRatePrescaler_256;
mbed_official 76:aeb1df146756 134
mbed_official 76:aeb1df146756 135 if (ssel == NC) { // Master
mbed_official 76:aeb1df146756 136 obj->mode = SPI_Mode_Master;
mbed_official 76:aeb1df146756 137 obj->nss = SPI_NSS_Soft;
mbed_official 76:aeb1df146756 138 }
mbed_official 76:aeb1df146756 139 else { // Slave
mbed_official 76:aeb1df146756 140 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 76:aeb1df146756 141 obj->mode = SPI_Mode_Slave;
mbed_official 76:aeb1df146756 142 obj->nss = SPI_NSS_Soft;
mbed_official 76:aeb1df146756 143 }
mbed_official 76:aeb1df146756 144
mbed_official 76:aeb1df146756 145 init_spi(obj);
mbed_official 76:aeb1df146756 146 }
mbed_official 76:aeb1df146756 147
mbed_official 76:aeb1df146756 148 void spi_free(spi_t *obj) {
mbed_official 76:aeb1df146756 149 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 150 SPI_I2S_DeInit(spi);
mbed_official 76:aeb1df146756 151 }
mbed_official 76:aeb1df146756 152
mbed_official 76:aeb1df146756 153 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 76:aeb1df146756 154 // Save new values
mbed_official 76:aeb1df146756 155 if (bits == 8) {
mbed_official 76:aeb1df146756 156 obj->bits = SPI_DataSize_8b;
mbed_official 76:aeb1df146756 157 }
mbed_official 76:aeb1df146756 158 else {
mbed_official 76:aeb1df146756 159 obj->bits = SPI_DataSize_16b;
mbed_official 76:aeb1df146756 160 }
mbed_official 76:aeb1df146756 161
mbed_official 76:aeb1df146756 162 switch (mode) {
mbed_official 76:aeb1df146756 163 case 0:
mbed_official 76:aeb1df146756 164 obj->cpol = SPI_CPOL_Low;
mbed_official 76:aeb1df146756 165 obj->cpha = SPI_CPHA_1Edge;
mbed_official 76:aeb1df146756 166 break;
mbed_official 76:aeb1df146756 167 case 1:
mbed_official 76:aeb1df146756 168 obj->cpol = SPI_CPOL_Low;
mbed_official 76:aeb1df146756 169 obj->cpha = SPI_CPHA_2Edge;
mbed_official 76:aeb1df146756 170 break;
mbed_official 76:aeb1df146756 171 case 2:
mbed_official 76:aeb1df146756 172 obj->cpol = SPI_CPOL_High;
mbed_official 76:aeb1df146756 173 obj->cpha = SPI_CPHA_1Edge;
mbed_official 76:aeb1df146756 174 break;
mbed_official 76:aeb1df146756 175 default:
mbed_official 76:aeb1df146756 176 obj->cpol = SPI_CPOL_High;
mbed_official 76:aeb1df146756 177 obj->cpha = SPI_CPHA_2Edge;
mbed_official 76:aeb1df146756 178 break;
mbed_official 76:aeb1df146756 179 }
mbed_official 76:aeb1df146756 180
mbed_official 76:aeb1df146756 181 if (slave == 0) {
mbed_official 76:aeb1df146756 182 obj->mode = SPI_Mode_Master;
mbed_official 76:aeb1df146756 183 obj->nss = SPI_NSS_Soft;
mbed_official 76:aeb1df146756 184 }
mbed_official 76:aeb1df146756 185 else {
mbed_official 76:aeb1df146756 186 obj->mode = SPI_Mode_Slave;
mbed_official 76:aeb1df146756 187 obj->nss = SPI_NSS_Hard;
mbed_official 76:aeb1df146756 188 }
mbed_official 76:aeb1df146756 189
mbed_official 76:aeb1df146756 190 init_spi(obj);
mbed_official 76:aeb1df146756 191 }
mbed_official 76:aeb1df146756 192
mbed_official 76:aeb1df146756 193 void spi_frequency(spi_t *obj, int hz) {
mbed_official 129:0182c99221bc 194 // Note: The frequencies are obtained with SPI clock = 32 MHz (APB1 & APB2 clocks)
mbed_official 129:0182c99221bc 195 if (hz < 250000) {
mbed_official 129:0182c99221bc 196 obj->br_presc = SPI_BaudRatePrescaler_256; // 125 kHz
mbed_official 129:0182c99221bc 197 }
mbed_official 129:0182c99221bc 198 else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 129:0182c99221bc 199 obj->br_presc = SPI_BaudRatePrescaler_128; // 250 kHz
mbed_official 129:0182c99221bc 200 }
mbed_official 129:0182c99221bc 201 else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 129:0182c99221bc 202 obj->br_presc = SPI_BaudRatePrescaler_64; // 500 kHz
mbed_official 129:0182c99221bc 203 }
mbed_official 129:0182c99221bc 204 else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 129:0182c99221bc 205 obj->br_presc = SPI_BaudRatePrescaler_32; // 1 MHz
mbed_official 129:0182c99221bc 206 }
mbed_official 129:0182c99221bc 207 else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 129:0182c99221bc 208 obj->br_presc = SPI_BaudRatePrescaler_16; // 2 MHz
mbed_official 129:0182c99221bc 209 }
mbed_official 129:0182c99221bc 210 else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 129:0182c99221bc 211 obj->br_presc = SPI_BaudRatePrescaler_8; // 4 MHz
mbed_official 129:0182c99221bc 212 }
mbed_official 129:0182c99221bc 213 else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 129:0182c99221bc 214 obj->br_presc = SPI_BaudRatePrescaler_4; // 8 MHz
mbed_official 129:0182c99221bc 215 }
mbed_official 129:0182c99221bc 216 else { // >= 16000000
mbed_official 129:0182c99221bc 217 obj->br_presc = SPI_BaudRatePrescaler_2; // 16 MHz
mbed_official 129:0182c99221bc 218 }
mbed_official 76:aeb1df146756 219 init_spi(obj);
mbed_official 76:aeb1df146756 220 }
mbed_official 76:aeb1df146756 221
mbed_official 76:aeb1df146756 222 static inline int ssp_readable(spi_t *obj) {
mbed_official 76:aeb1df146756 223 int status;
mbed_official 76:aeb1df146756 224 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 225 // Check if data is received
mbed_official 76:aeb1df146756 226 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 227 return status;
mbed_official 76:aeb1df146756 228 }
mbed_official 76:aeb1df146756 229
mbed_official 76:aeb1df146756 230 static inline int ssp_writeable(spi_t *obj) {
mbed_official 76:aeb1df146756 231 int status;
mbed_official 76:aeb1df146756 232 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 233 // Check if data is transmitted
mbed_official 76:aeb1df146756 234 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 235 return status;
mbed_official 76:aeb1df146756 236 }
mbed_official 76:aeb1df146756 237
mbed_official 76:aeb1df146756 238 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 239 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 240 while (!ssp_writeable(obj));
mbed_official 76:aeb1df146756 241 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 76:aeb1df146756 242 }
mbed_official 76:aeb1df146756 243
mbed_official 76:aeb1df146756 244 static inline int ssp_read(spi_t *obj) {
mbed_official 76:aeb1df146756 245 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 246 while (!ssp_readable(obj));
mbed_official 76:aeb1df146756 247 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 76:aeb1df146756 248 }
mbed_official 76:aeb1df146756 249
mbed_official 76:aeb1df146756 250 static inline int ssp_busy(spi_t *obj) {
mbed_official 76:aeb1df146756 251 int status;
mbed_official 76:aeb1df146756 252 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 253 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 254 return status;
mbed_official 76:aeb1df146756 255 }
mbed_official 76:aeb1df146756 256
mbed_official 76:aeb1df146756 257 int spi_master_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 258 ssp_write(obj, value);
mbed_official 76:aeb1df146756 259 return ssp_read(obj);
mbed_official 76:aeb1df146756 260 }
mbed_official 76:aeb1df146756 261
mbed_official 76:aeb1df146756 262 int spi_slave_receive(spi_t *obj) {
mbed_official 76:aeb1df146756 263 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 76:aeb1df146756 264 };
mbed_official 76:aeb1df146756 265
mbed_official 76:aeb1df146756 266 int spi_slave_read(spi_t *obj) {
mbed_official 76:aeb1df146756 267 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 268 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 76:aeb1df146756 269 }
mbed_official 76:aeb1df146756 270
mbed_official 76:aeb1df146756 271 void spi_slave_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 272 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 273 while (!ssp_writeable(obj));
mbed_official 76:aeb1df146756 274 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 76:aeb1df146756 275 }
mbed_official 76:aeb1df146756 276
mbed_official 76:aeb1df146756 277 int spi_busy(spi_t *obj) {
mbed_official 76:aeb1df146756 278 return ssp_busy(obj);
mbed_official 76:aeb1df146756 279 }
mbed_official 76:aeb1df146756 280
mbed_official 76:aeb1df146756 281 #endif