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_DISCO_F303VC/spi_api.c@227:7bd0639b8911, 2014-06-11 (annotated)

Committer:
mbed_official
Date:
Wed Jun 11 16:00:09 2014 +0100
Revision:
227:7bd0639b8911
Parent:
157:90e3acc479a2
Child:
241:ffe41b0c8126
Synchronized with git revision d58d532ebc0e0a96f4fffb8edefc082b71b964af



Full URL: https://github.com/mbedmicro/mbed/commit/d58d532ebc0e0a96f4fffb8edefc082b71b964af/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 157:90e3acc479a2 1 /* mbed Microcontroller Library
mbed_official 157:90e3acc479a2 2 *******************************************************************************
mbed_official 157:90e3acc479a2 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 157:90e3acc479a2 4 * All rights reserved.
mbed_official 157:90e3acc479a2 5 *
mbed_official 157:90e3acc479a2 6 * Redistribution and use in source and binary forms, with or without
mbed_official 157:90e3acc479a2 7 * modification, are permitted provided that the following conditions are met:
mbed_official 157:90e3acc479a2 8 *
mbed_official 157:90e3acc479a2 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 157:90e3acc479a2 10 * this list of conditions and the following disclaimer.
mbed_official 157:90e3acc479a2 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 157:90e3acc479a2 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 157:90e3acc479a2 13 * and/or other materials provided with the distribution.
mbed_official 157:90e3acc479a2 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 157:90e3acc479a2 15 * may be used to endorse or promote products derived from this software
mbed_official 157:90e3acc479a2 16 * without specific prior written permission.
mbed_official 157:90e3acc479a2 17 *
mbed_official 157:90e3acc479a2 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 157:90e3acc479a2 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 157:90e3acc479a2 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 157:90e3acc479a2 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 157:90e3acc479a2 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 157:90e3acc479a2 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 157:90e3acc479a2 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 157:90e3acc479a2 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 157:90e3acc479a2 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 157:90e3acc479a2 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 157:90e3acc479a2 28 *******************************************************************************
mbed_official 157:90e3acc479a2 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 157:90e3acc479a2 31 #include "spi_api.h"
mbed_official 157:90e3acc479a2 32
mbed_official 157:90e3acc479a2 33 #if DEVICE_SPI
mbed_official 157:90e3acc479a2 34
mbed_official 157:90e3acc479a2 35 #include <math.h>
mbed_official 157:90e3acc479a2 36 #include "cmsis.h"
mbed_official 157:90e3acc479a2 37 #include "pinmap.h"
mbed_official 157:90e3acc479a2 38
mbed_official 157:90e3acc479a2 39 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 157:90e3acc479a2 40 {PA_11, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 157:90e3acc479a2 41 {PB_5, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 157:90e3acc479a2 42 {PB_15, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 157:90e3acc479a2 43 {PC_12, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 157:90e3acc479a2 44 {NC, NC, 0}
mbed_official 157:90e3acc479a2 45 };
mbed_official 157:90e3acc479a2 46
mbed_official 157:90e3acc479a2 47 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 157:90e3acc479a2 48 {PA_10, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 157:90e3acc479a2 49 {PB_4, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 157:90e3acc479a2 50 {PB_14, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 157:90e3acc479a2 51 {PC_11, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 157:90e3acc479a2 52 {NC, NC, 0}
mbed_official 157:90e3acc479a2 53 };
mbed_official 157:90e3acc479a2 54
mbed_official 157:90e3acc479a2 55 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 157:90e3acc479a2 56 {PB_3, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 157:90e3acc479a2 57 {PB_13, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 157:90e3acc479a2 58 {PC_10, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 157:90e3acc479a2 59 {PF_1, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 157:90e3acc479a2 60 {NC, NC, 0}
mbed_official 157:90e3acc479a2 61 };
mbed_official 157:90e3acc479a2 62
mbed_official 157:90e3acc479a2 63 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 157:90e3acc479a2 64 {PA_4, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 157:90e3acc479a2 65 {PA_15, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 157:90e3acc479a2 66 {PB_12, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 157:90e3acc479a2 67 {PF_0, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 157:90e3acc479a2 68 {NC, NC, 0}
mbed_official 157:90e3acc479a2 69 };
mbed_official 157:90e3acc479a2 70
mbed_official 157:90e3acc479a2 71 static void init_spi(spi_t *obj) {
mbed_official 157:90e3acc479a2 72 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 157:90e3acc479a2 73 SPI_InitTypeDef SPI_InitStructure;
mbed_official 157:90e3acc479a2 74
mbed_official 157:90e3acc479a2 75 SPI_Cmd(spi, DISABLE);
mbed_official 157:90e3acc479a2 76
mbed_official 157:90e3acc479a2 77 SPI_InitStructure.SPI_Mode = obj->mode;
mbed_official 227:7bd0639b8911 78 SPI_InitStructure.SPI_NSS = obj->nss;
mbed_official 227:7bd0639b8911 79 SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
mbed_official 157:90e3acc479a2 80 SPI_InitStructure.SPI_DataSize = obj->bits;
mbed_official 157:90e3acc479a2 81 SPI_InitStructure.SPI_CPOL = obj->cpol;
mbed_official 227:7bd0639b8911 82 SPI_InitStructure.SPI_CPHA = obj->cpha;
mbed_official 157:90e3acc479a2 83 SPI_InitStructure.SPI_BaudRatePrescaler = obj->br_presc;
mbed_official 157:90e3acc479a2 84 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
mbed_official 157:90e3acc479a2 85 SPI_InitStructure.SPI_CRCPolynomial = 7;
mbed_official 157:90e3acc479a2 86 SPI_Init(spi, &SPI_InitStructure);
mbed_official 157:90e3acc479a2 87
mbed_official 227:7bd0639b8911 88 SPI_RxFIFOThresholdConfig(spi, SPI_RxFIFOThreshold_QF);
mbed_official 157:90e3acc479a2 89
mbed_official 157:90e3acc479a2 90 SPI_Cmd(spi, ENABLE);
mbed_official 157:90e3acc479a2 91 }
mbed_official 157:90e3acc479a2 92
mbed_official 157:90e3acc479a2 93 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 157:90e3acc479a2 94 // Determine the SPI to use
mbed_official 157:90e3acc479a2 95 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 157:90e3acc479a2 96 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 157:90e3acc479a2 97 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 157:90e3acc479a2 98 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 157:90e3acc479a2 99
mbed_official 157:90e3acc479a2 100 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 157:90e3acc479a2 101 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 157:90e3acc479a2 102
mbed_official 157:90e3acc479a2 103 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 227:7bd0639b8911 104 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 157:90e3acc479a2 105
mbed_official 157:90e3acc479a2 106 // Enable SPI clock
mbed_official 157:90e3acc479a2 107 if (obj->spi == SPI_2) {
mbed_official 227:7bd0639b8911 108 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 157:90e3acc479a2 109 }
mbed_official 157:90e3acc479a2 110 if (obj->spi == SPI_3) {
mbed_official 227:7bd0639b8911 111 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
mbed_official 157:90e3acc479a2 112 }
mbed_official 157:90e3acc479a2 113
mbed_official 157:90e3acc479a2 114 // Configure the SPI pins
mbed_official 157:90e3acc479a2 115 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 157:90e3acc479a2 116 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 157:90e3acc479a2 117 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 157:90e3acc479a2 118
mbed_official 157:90e3acc479a2 119 // Save new values
mbed_official 157:90e3acc479a2 120 obj->bits = SPI_DataSize_8b;
mbed_official 157:90e3acc479a2 121 obj->cpol = SPI_CPOL_Low;
mbed_official 157:90e3acc479a2 122 obj->cpha = SPI_CPHA_1Edge;
mbed_official 157:90e3acc479a2 123 obj->br_presc = SPI_BaudRatePrescaler_256;
mbed_official 157:90e3acc479a2 124
mbed_official 157:90e3acc479a2 125 if (ssel == NC) { // Master
mbed_official 157:90e3acc479a2 126 obj->mode = SPI_Mode_Master;
mbed_official 157:90e3acc479a2 127 obj->nss = SPI_NSS_Soft;
mbed_official 157:90e3acc479a2 128 } else { // Slave
mbed_official 157:90e3acc479a2 129 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 157:90e3acc479a2 130 obj->mode = SPI_Mode_Slave;
mbed_official 157:90e3acc479a2 131 obj->nss = SPI_NSS_Soft;
mbed_official 157:90e3acc479a2 132 }
mbed_official 157:90e3acc479a2 133
mbed_official 157:90e3acc479a2 134 init_spi(obj);
mbed_official 157:90e3acc479a2 135 }
mbed_official 157:90e3acc479a2 136
mbed_official 157:90e3acc479a2 137 void spi_free(spi_t *obj) {
mbed_official 157:90e3acc479a2 138 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 157:90e3acc479a2 139 SPI_I2S_DeInit(spi);
mbed_official 157:90e3acc479a2 140 }
mbed_official 157:90e3acc479a2 141
mbed_official 227:7bd0639b8911 142 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 157:90e3acc479a2 143 // Save new values
mbed_official 157:90e3acc479a2 144 if (bits == 8) {
mbed_official 157:90e3acc479a2 145 obj->bits = SPI_DataSize_8b;
mbed_official 157:90e3acc479a2 146 } else {
mbed_official 157:90e3acc479a2 147 obj->bits = SPI_DataSize_16b;
mbed_official 157:90e3acc479a2 148 }
mbed_official 157:90e3acc479a2 149
mbed_official 157:90e3acc479a2 150 switch (mode) {
mbed_official 157:90e3acc479a2 151 case 0:
mbed_official 157:90e3acc479a2 152 obj->cpol = SPI_CPOL_Low;
mbed_official 157:90e3acc479a2 153 obj->cpha = SPI_CPHA_1Edge;
mbed_official 157:90e3acc479a2 154 break;
mbed_official 157:90e3acc479a2 155 case 1:
mbed_official 157:90e3acc479a2 156 obj->cpol = SPI_CPOL_Low;
mbed_official 157:90e3acc479a2 157 obj->cpha = SPI_CPHA_2Edge;
mbed_official 157:90e3acc479a2 158 break;
mbed_official 157:90e3acc479a2 159 case 2:
mbed_official 157:90e3acc479a2 160 obj->cpol = SPI_CPOL_High;
mbed_official 227:7bd0639b8911 161 obj->cpha = SPI_CPHA_1Edge;
mbed_official 157:90e3acc479a2 162 break;
mbed_official 157:90e3acc479a2 163 default:
mbed_official 157:90e3acc479a2 164 obj->cpol = SPI_CPOL_High;
mbed_official 227:7bd0639b8911 165 obj->cpha = SPI_CPHA_2Edge;
mbed_official 157:90e3acc479a2 166 break;
mbed_official 157:90e3acc479a2 167 }
mbed_official 157:90e3acc479a2 168
mbed_official 157:90e3acc479a2 169 if (slave == 0) {
mbed_official 157:90e3acc479a2 170 obj->mode = SPI_Mode_Master;
mbed_official 157:90e3acc479a2 171 obj->nss = SPI_NSS_Soft;
mbed_official 157:90e3acc479a2 172 } else {
mbed_official 157:90e3acc479a2 173 obj->mode = SPI_Mode_Slave;
mbed_official 227:7bd0639b8911 174 obj->nss = SPI_NSS_Hard;
mbed_official 157:90e3acc479a2 175 }
mbed_official 157:90e3acc479a2 176
mbed_official 157:90e3acc479a2 177 init_spi(obj);
mbed_official 157:90e3acc479a2 178 }
mbed_official 157:90e3acc479a2 179
mbed_official 157:90e3acc479a2 180 void spi_frequency(spi_t *obj, int hz) {
mbed_official 157:90e3acc479a2 181 // Values depend of PCLK1: 32 MHz if HSI is used, 36 MHz if HSE is used
mbed_official 157:90e3acc479a2 182 if (hz < 250000) {
mbed_official 157:90e3acc479a2 183 obj->br_presc = SPI_BaudRatePrescaler_256; // 125 kHz - 141 kHz
mbed_official 157:90e3acc479a2 184 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 157:90e3acc479a2 185 obj->br_presc = SPI_BaudRatePrescaler_128; // 250 kHz - 280 kHz
mbed_official 157:90e3acc479a2 186 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 157:90e3acc479a2 187 obj->br_presc = SPI_BaudRatePrescaler_64; // 500 kHz - 560 kHz
mbed_official 157:90e3acc479a2 188 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 157:90e3acc479a2 189 obj->br_presc = SPI_BaudRatePrescaler_32; // 1 MHz - 1.13 MHz
mbed_official 157:90e3acc479a2 190 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 157:90e3acc479a2 191 obj->br_presc = SPI_BaudRatePrescaler_16; // 2 MHz - 2.25 MHz
mbed_official 157:90e3acc479a2 192 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 157:90e3acc479a2 193 obj->br_presc = SPI_BaudRatePrescaler_8; // 4 MHz - 4.5 MHz
mbed_official 157:90e3acc479a2 194 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 157:90e3acc479a2 195 obj->br_presc = SPI_BaudRatePrescaler_4; // 8 MHz - 9 MHz
mbed_official 157:90e3acc479a2 196 } else { // >= 16000000
mbed_official 157:90e3acc479a2 197 obj->br_presc = SPI_BaudRatePrescaler_2; // 16 MHz - 18 MHz
mbed_official 157:90e3acc479a2 198 }
mbed_official 157:90e3acc479a2 199 init_spi(obj);
mbed_official 157:90e3acc479a2 200 }
mbed_official 157:90e3acc479a2 201
mbed_official 157:90e3acc479a2 202 static inline int ssp_readable(spi_t *obj) {
mbed_official 157:90e3acc479a2 203 int status;
mbed_official 157:90e3acc479a2 204 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 157:90e3acc479a2 205 // Check if data is received
mbed_official 157:90e3acc479a2 206 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 227:7bd0639b8911 207 return status;
mbed_official 157:90e3acc479a2 208 }
mbed_official 157:90e3acc479a2 209
mbed_official 157:90e3acc479a2 210 static inline int ssp_writeable(spi_t *obj) {
mbed_official 157:90e3acc479a2 211 int status;
mbed_official 157:90e3acc479a2 212 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 157:90e3acc479a2 213 // Check if data is transmitted
mbed_official 157:90e3acc479a2 214 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 157:90e3acc479a2 215 return status;
mbed_official 157:90e3acc479a2 216 }
mbed_official 157:90e3acc479a2 217
mbed_official 157:90e3acc479a2 218 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 227:7bd0639b8911 219 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 157:90e3acc479a2 220 while (!ssp_writeable(obj));
mbed_official 157:90e3acc479a2 221 if (obj->bits == SPI_DataSize_8b) {
mbed_official 157:90e3acc479a2 222 SPI_SendData8(spi, (uint8_t)value);
mbed_official 157:90e3acc479a2 223 } else {
mbed_official 157:90e3acc479a2 224 SPI_I2S_SendData16(spi, (uint16_t)value);
mbed_official 157:90e3acc479a2 225 }
mbed_official 157:90e3acc479a2 226 }
mbed_official 157:90e3acc479a2 227
mbed_official 157:90e3acc479a2 228 static inline int ssp_read(spi_t *obj) {
mbed_official 227:7bd0639b8911 229 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 157:90e3acc479a2 230 while (!ssp_readable(obj));
mbed_official 157:90e3acc479a2 231 if (obj->bits == SPI_DataSize_8b) {
mbed_official 157:90e3acc479a2 232 return (int)SPI_ReceiveData8(spi);
mbed_official 157:90e3acc479a2 233 } else {
mbed_official 157:90e3acc479a2 234 return (int)SPI_I2S_ReceiveData16(spi);
mbed_official 157:90e3acc479a2 235 }
mbed_official 157:90e3acc479a2 236 }
mbed_official 157:90e3acc479a2 237
mbed_official 157:90e3acc479a2 238 static inline int ssp_busy(spi_t *obj) {
mbed_official 157:90e3acc479a2 239 int status;
mbed_official 157:90e3acc479a2 240 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 157:90e3acc479a2 241 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 157:90e3acc479a2 242 return status;
mbed_official 157:90e3acc479a2 243 }
mbed_official 157:90e3acc479a2 244
mbed_official 157:90e3acc479a2 245 int spi_master_write(spi_t *obj, int value) {
mbed_official 157:90e3acc479a2 246 ssp_write(obj, value);
mbed_official 157:90e3acc479a2 247 return ssp_read(obj);
mbed_official 157:90e3acc479a2 248 }
mbed_official 157:90e3acc479a2 249
mbed_official 157:90e3acc479a2 250 int spi_slave_receive(spi_t *obj) {
mbed_official 157:90e3acc479a2 251 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 157:90e3acc479a2 252 };
mbed_official 157:90e3acc479a2 253
mbed_official 157:90e3acc479a2 254 int spi_slave_read(spi_t *obj) {
mbed_official 157:90e3acc479a2 255 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 157:90e3acc479a2 256 if (obj->bits == SPI_DataSize_8b) {
mbed_official 157:90e3acc479a2 257 return (int)SPI_ReceiveData8(spi);
mbed_official 157:90e3acc479a2 258 } else {
mbed_official 157:90e3acc479a2 259 return (int)SPI_I2S_ReceiveData16(spi);
mbed_official 157:90e3acc479a2 260 }
mbed_official 157:90e3acc479a2 261 }
mbed_official 157:90e3acc479a2 262
mbed_official 157:90e3acc479a2 263 void spi_slave_write(spi_t *obj, int value) {
mbed_official 227:7bd0639b8911 264 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 227:7bd0639b8911 265 while (!ssp_writeable(obj));
mbed_official 157:90e3acc479a2 266 if (obj->bits == SPI_DataSize_8b) {
mbed_official 157:90e3acc479a2 267 SPI_SendData8(spi, (uint8_t)value);
mbed_official 157:90e3acc479a2 268 } else {
mbed_official 157:90e3acc479a2 269 SPI_I2S_SendData16(spi, (uint16_t)value);
mbed_official 157:90e3acc479a2 270 }
mbed_official 157:90e3acc479a2 271 }
mbed_official 157:90e3acc479a2 272
mbed_official 157:90e3acc479a2 273 int spi_busy(spi_t *obj) {
mbed_official 157:90e3acc479a2 274 return ssp_busy(obj);
mbed_official 157:90e3acc479a2 275 }
mbed_official 157:90e3acc479a2 276
mbed_official 157:90e3acc479a2 277 #endif