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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 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