Sigve Sebastian Farstad / mbed-src

mbed w/ spi bug fig

Dependents:   display-puck

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/spi_api.c@233:1bbc1451db33, 2014-06-17 (annotated)

Committer:
mbed_official
Date:
Tue Jun 17 11:30:08 2014 +0100
Revision:
233:1bbc1451db33
Parent:
227:7bd0639b8911 
Synchronized with git revision f60bb902c9fd07cbc8e2726c4264aa4f710e2541



Full URL: https://github.com/mbedmicro/mbed/commit/f60bb902c9fd07cbc8e2726c4264aa4f710e2541/



kds exporter

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 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 52:a51c77007319 31 #include "spi_api.h"
mbed_official 52:a51c77007319 32
mbed_official 52:a51c77007319 33 #if DEVICE_SPI
mbed_official 52:a51c77007319 34
mbed_official 52:a51c77007319 35 #include <math.h>
mbed_official 52:a51c77007319 36 #include "cmsis.h"
mbed_official 52:a51c77007319 37 #include "pinmap.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 227:7bd0639b8911 98 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 174:8bb9f3a33240 99
mbed_official 52:a51c77007319 100 // Enable SPI clock
mbed_official 52:a51c77007319 101 if (obj->spi == SPI_1) {
mbed_official 174:8bb9f3a33240 102 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 52:a51c77007319 103 }
mbed_official 139:e3413eddde57 104 if (obj->spi == SPI_2) {
mbed_official 139:e3413eddde57 105 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 139:e3413eddde57 106 }
mbed_official 139:e3413eddde57 107
mbed_official 52:a51c77007319 108 // Configure the SPI pins
mbed_official 52:a51c77007319 109 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 52:a51c77007319 110 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 52:a51c77007319 111 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 174:8bb9f3a33240 112
mbed_official 52:a51c77007319 113 // Save new values
mbed_official 52:a51c77007319 114 obj->bits = SPI_DataSize_8b;
mbed_official 52:a51c77007319 115 obj->cpol = SPI_CPOL_Low;
mbed_official 52:a51c77007319 116 obj->cpha = SPI_CPHA_1Edge;
mbed_official 139:e3413eddde57 117 obj->br_presc = SPI_BaudRatePrescaler_256;
mbed_official 174:8bb9f3a33240 118
mbed_official 208:4557f4bb2dd5 119 obj->pin_miso = miso;
mbed_official 208:4557f4bb2dd5 120 obj->pin_mosi = mosi;
mbed_official 208:4557f4bb2dd5 121 obj->pin_sclk = sclk;
mbed_official 208:4557f4bb2dd5 122 obj->pin_ssel = ssel;
mbed_official 208:4557f4bb2dd5 123
mbed_official 52:a51c77007319 124 if (ssel == NC) { // Master
mbed_official 52:a51c77007319 125 obj->mode = SPI_Mode_Master;
mbed_official 52:a51c77007319 126 obj->nss = SPI_NSS_Soft;
mbed_official 174:8bb9f3a33240 127 } else { // Slave
mbed_official 52:a51c77007319 128 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 52:a51c77007319 129 obj->mode = SPI_Mode_Slave;
mbed_official 181:a4cbdfbbd2f4 130 obj->nss = SPI_NSS_Hard;
mbed_official 52:a51c77007319 131 }
mbed_official 52:a51c77007319 132
mbed_official 56:99eb381a3269 133 init_spi(obj);
mbed_official 52:a51c77007319 134 }
mbed_official 52:a51c77007319 135
mbed_official 52:a51c77007319 136 void spi_free(spi_t *obj) {
mbed_official 208:4557f4bb2dd5 137 // Reset SPI and disable clock
mbed_official 208:4557f4bb2dd5 138 if (obj->spi == SPI_1) {
mbed_official 208:4557f4bb2dd5 139 RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 208:4557f4bb2dd5 140 RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, DISABLE);
mbed_official 208:4557f4bb2dd5 141 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, DISABLE);
mbed_official 208:4557f4bb2dd5 142 }
mbed_official 208:4557f4bb2dd5 143
mbed_official 208:4557f4bb2dd5 144 if (obj->spi == SPI_2) {
mbed_official 208:4557f4bb2dd5 145 RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 208:4557f4bb2dd5 146 RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, DISABLE);
mbed_official 208:4557f4bb2dd5 147 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, DISABLE);
mbed_official 208:4557f4bb2dd5 148 }
mbed_official 208:4557f4bb2dd5 149
mbed_official 208:4557f4bb2dd5 150 // Configure GPIOs
mbed_official 208:4557f4bb2dd5 151 pin_function(obj->pin_miso, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0));
mbed_official 208:4557f4bb2dd5 152 pin_function(obj->pin_mosi, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0));
mbed_official 208:4557f4bb2dd5 153 pin_function(obj->pin_sclk, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0));
mbed_official 208:4557f4bb2dd5 154 pin_function(obj->pin_ssel, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0));
mbed_official 52:a51c77007319 155 }
mbed_official 52:a51c77007319 156
mbed_official 174:8bb9f3a33240 157 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 52:a51c77007319 158 // Save new values
mbed_official 233:1bbc1451db33 159 if (bits == 16) {
mbed_official 233:1bbc1451db33 160 obj->bits = SPI_DataSize_16b;
mbed_official 233:1bbc1451db33 161 } else {
mbed_official 52:a51c77007319 162 obj->bits = SPI_DataSize_8b;
mbed_official 52:a51c77007319 163 }
mbed_official 174:8bb9f3a33240 164
mbed_official 52:a51c77007319 165 switch (mode) {
mbed_official 52:a51c77007319 166 case 0:
mbed_official 174:8bb9f3a33240 167 obj->cpol = SPI_CPOL_Low;
mbed_official 174:8bb9f3a33240 168 obj->cpha = SPI_CPHA_1Edge;
mbed_official 174:8bb9f3a33240 169 break;
mbed_official 52:a51c77007319 170 case 1:
mbed_official 174:8bb9f3a33240 171 obj->cpol = SPI_CPOL_Low;
mbed_official 174:8bb9f3a33240 172 obj->cpha = SPI_CPHA_2Edge;
mbed_official 174:8bb9f3a33240 173 break;
mbed_official 52:a51c77007319 174 case 2:
mbed_official 174:8bb9f3a33240 175 obj->cpol = SPI_CPOL_High;
mbed_official 174:8bb9f3a33240 176 obj->cpha = SPI_CPHA_1Edge;
mbed_official 174:8bb9f3a33240 177 break;
mbed_official 52:a51c77007319 178 default:
mbed_official 174:8bb9f3a33240 179 obj->cpol = SPI_CPOL_High;
mbed_official 174:8bb9f3a33240 180 obj->cpha = SPI_CPHA_2Edge;
mbed_official 174:8bb9f3a33240 181 break;
mbed_official 52:a51c77007319 182 }
mbed_official 174:8bb9f3a33240 183
mbed_official 52:a51c77007319 184 if (slave == 0) {
mbed_official 52:a51c77007319 185 obj->mode = SPI_Mode_Master;
mbed_official 52:a51c77007319 186 obj->nss = SPI_NSS_Soft;
mbed_official 174:8bb9f3a33240 187 } else {
mbed_official 52:a51c77007319 188 obj->mode = SPI_Mode_Slave;
mbed_official 174:8bb9f3a33240 189 obj->nss = SPI_NSS_Hard;
mbed_official 52:a51c77007319 190 }
mbed_official 174:8bb9f3a33240 191
mbed_official 56:99eb381a3269 192 init_spi(obj);
mbed_official 52:a51c77007319 193 }
mbed_official 52:a51c77007319 194
mbed_official 52:a51c77007319 195 void spi_frequency(spi_t *obj, int hz) {
mbed_official 139:e3413eddde57 196 if (obj->spi == SPI_1) {
mbed_official 139:e3413eddde57 197 // Values depend of PCLK2: 64 MHz if HSI is used, 72 MHz if HSE is used
mbed_official 139:e3413eddde57 198 if (hz < 500000) {
mbed_official 139:e3413eddde57 199 obj->br_presc = SPI_BaudRatePrescaler_256; // 250 kHz - 281 kHz
mbed_official 174:8bb9f3a33240 200 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 201 obj->br_presc = SPI_BaudRatePrescaler_128; // 500 kHz - 563 kHz
mbed_official 174:8bb9f3a33240 202 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 139:e3413eddde57 203 obj->br_presc = SPI_BaudRatePrescaler_64; // 1 MHz - 1.13 MHz
mbed_official 174:8bb9f3a33240 204 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 139:e3413eddde57 205 obj->br_presc = SPI_BaudRatePrescaler_32; // 2 MHz - 2.25 MHz
mbed_official 174:8bb9f3a33240 206 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 139:e3413eddde57 207 obj->br_presc = SPI_BaudRatePrescaler_16; // 4 MHz - 4.5 MHz
mbed_official 174:8bb9f3a33240 208 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 139:e3413eddde57 209 obj->br_presc = SPI_BaudRatePrescaler_8; // 8 MHz - 9 MHz
mbed_official 174:8bb9f3a33240 210 } else if ((hz >= 16000000) && (hz < 32000000)) {
mbed_official 139:e3413eddde57 211 obj->br_presc = SPI_BaudRatePrescaler_4; // 16 MHz - 18 MHz
mbed_official 174:8bb9f3a33240 212 } else { // >= 32000000
mbed_official 139:e3413eddde57 213 obj->br_presc = SPI_BaudRatePrescaler_2; // 32 MHz - 36 MHz
mbed_official 139:e3413eddde57 214 }
mbed_official 139:e3413eddde57 215 }
mbed_official 174:8bb9f3a33240 216
mbed_official 139:e3413eddde57 217 if (obj->spi == SPI_2) {
mbed_official 139:e3413eddde57 218 // Values depend of PCLK1: 32 MHz if HSI is used, 36 MHz if HSE is used
mbed_official 139:e3413eddde57 219 if (hz < 250000) {
mbed_official 139:e3413eddde57 220 obj->br_presc = SPI_BaudRatePrescaler_256; // 125 kHz - 141 kHz
mbed_official 174:8bb9f3a33240 221 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 139:e3413eddde57 222 obj->br_presc = SPI_BaudRatePrescaler_128; // 250 kHz - 281 kHz
mbed_official 174:8bb9f3a33240 223 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 224 obj->br_presc = SPI_BaudRatePrescaler_64; // 500 kHz - 563 kHz
mbed_official 174:8bb9f3a33240 225 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 139:e3413eddde57 226 obj->br_presc = SPI_BaudRatePrescaler_32; // 1 MHz - 1.13 MHz
mbed_official 174:8bb9f3a33240 227 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 139:e3413eddde57 228 obj->br_presc = SPI_BaudRatePrescaler_16; // 2 MHz - 2.25 MHz
mbed_official 174:8bb9f3a33240 229 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 139:e3413eddde57 230 obj->br_presc = SPI_BaudRatePrescaler_8; // 4 MHz - 4.5 MHz
mbed_official 174:8bb9f3a33240 231 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 139:e3413eddde57 232 obj->br_presc = SPI_BaudRatePrescaler_4; // 8 MHz - 9 MHz
mbed_official 174:8bb9f3a33240 233 } else { // >= 16000000
mbed_official 139:e3413eddde57 234 obj->br_presc = SPI_BaudRatePrescaler_2; // 16 MHz - 18 MHz
mbed_official 139:e3413eddde57 235 }
mbed_official 139:e3413eddde57 236 }
mbed_official 52:a51c77007319 237
mbed_official 56:99eb381a3269 238 init_spi(obj);
mbed_official 52:a51c77007319 239 }
mbed_official 52:a51c77007319 240
mbed_official 52:a51c77007319 241 static inline int ssp_readable(spi_t *obj) {
mbed_official 52:a51c77007319 242 int status;
mbed_official 52:a51c77007319 243 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 244 // Check if data is received
mbed_official 52:a51c77007319 245 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 174:8bb9f3a33240 246 return status;
mbed_official 52:a51c77007319 247 }
mbed_official 52:a51c77007319 248
mbed_official 52:a51c77007319 249 static inline int ssp_writeable(spi_t *obj) {
mbed_official 52:a51c77007319 250 int status;
mbed_official 52:a51c77007319 251 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 252 // Check if data is transmitted
mbed_official 52:a51c77007319 253 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 52:a51c77007319 254 return status;
mbed_official 52:a51c77007319 255 }
mbed_official 52:a51c77007319 256
mbed_official 52:a51c77007319 257 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 174:8bb9f3a33240 258 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 259 while (!ssp_writeable(obj));
mbed_official 52:a51c77007319 260 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 52:a51c77007319 261 }
mbed_official 52:a51c77007319 262
mbed_official 52:a51c77007319 263 static inline int ssp_read(spi_t *obj) {
mbed_official 174:8bb9f3a33240 264 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 265 while (!ssp_readable(obj));
mbed_official 52:a51c77007319 266 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 52:a51c77007319 267 }
mbed_official 52:a51c77007319 268
mbed_official 52:a51c77007319 269 static inline int ssp_busy(spi_t *obj) {
mbed_official 52:a51c77007319 270 int status;
mbed_official 52:a51c77007319 271 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 272 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 52:a51c77007319 273 return status;
mbed_official 52:a51c77007319 274 }
mbed_official 52:a51c77007319 275
mbed_official 52:a51c77007319 276 int spi_master_write(spi_t *obj, int value) {
mbed_official 52:a51c77007319 277 ssp_write(obj, value);
mbed_official 52:a51c77007319 278 return ssp_read(obj);
mbed_official 52:a51c77007319 279 }
mbed_official 52:a51c77007319 280
mbed_official 52:a51c77007319 281 int spi_slave_receive(spi_t *obj) {
mbed_official 233:1bbc1451db33 282 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 52:a51c77007319 283 };
mbed_official 52:a51c77007319 284
mbed_official 52:a51c77007319 285 int spi_slave_read(spi_t *obj) {
mbed_official 52:a51c77007319 286 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 287 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 52:a51c77007319 288 }
mbed_official 52:a51c77007319 289
mbed_official 52:a51c77007319 290 void spi_slave_write(spi_t *obj, int value) {
mbed_official 174:8bb9f3a33240 291 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 174:8bb9f3a33240 292 while (!ssp_writeable(obj));
mbed_official 52:a51c77007319 293 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 52:a51c77007319 294 }
mbed_official 52:a51c77007319 295
mbed_official 52:a51c77007319 296 int spi_busy(spi_t *obj) {
mbed_official 52:a51c77007319 297 return ssp_busy(obj);
mbed_official 52:a51c77007319 298 }
mbed_official 52:a51c77007319 299
mbed_official 52:a51c77007319 300 #endif