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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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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

Import librarymbed

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_F302R8/spi_api.c@125:23cc3068a9e4, 2014-03-19 (annotated)

Committer:
mbed_official
Date:
Wed Mar 19 10:15:22 2014 +0000
Revision:
125:23cc3068a9e4
Child:
135:067cc8ba23da
Synchronized with git revision ace35dfba3748c7cdc102eb38ec6b9e1067c3252



Full URL: https://github.com/mbedmicro/mbed/commit/ace35dfba3748c7cdc102eb38ec6b9e1067c3252/



[NUCLEO_F302R8] Add cmsis and hal files + change F401RE clock to 84MHz

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 125:23cc3068a9e4 1 /* mbed Microcontroller Library
mbed_official 125:23cc3068a9e4 2 *******************************************************************************
mbed_official 125:23cc3068a9e4 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 125:23cc3068a9e4 4 * All rights reserved.
mbed_official 125:23cc3068a9e4 5 *
mbed_official 125:23cc3068a9e4 6 * Redistribution and use in source and binary forms, with or without
mbed_official 125:23cc3068a9e4 7 * modification, are permitted provided that the following conditions are met:
mbed_official 125:23cc3068a9e4 8 *
mbed_official 125:23cc3068a9e4 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 125:23cc3068a9e4 10 * this list of conditions and the following disclaimer.
mbed_official 125:23cc3068a9e4 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 125:23cc3068a9e4 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 125:23cc3068a9e4 13 * and/or other materials provided with the distribution.
mbed_official 125:23cc3068a9e4 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 125:23cc3068a9e4 15 * may be used to endorse or promote products derived from this software
mbed_official 125:23cc3068a9e4 16 * without specific prior written permission.
mbed_official 125:23cc3068a9e4 17 *
mbed_official 125:23cc3068a9e4 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 125:23cc3068a9e4 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 125:23cc3068a9e4 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 125:23cc3068a9e4 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 125:23cc3068a9e4 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 125:23cc3068a9e4 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 125:23cc3068a9e4 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 125:23cc3068a9e4 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 125:23cc3068a9e4 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 125:23cc3068a9e4 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 125:23cc3068a9e4 28 *******************************************************************************
mbed_official 125:23cc3068a9e4 29 */
mbed_official 125:23cc3068a9e4 30 #include "spi_api.h"
mbed_official 125:23cc3068a9e4 31
mbed_official 125:23cc3068a9e4 32 #if DEVICE_SPI
mbed_official 125:23cc3068a9e4 33
mbed_official 125:23cc3068a9e4 34 #include <math.h>
mbed_official 125:23cc3068a9e4 35 #include "cmsis.h"
mbed_official 125:23cc3068a9e4 36 #include "pinmap.h"
mbed_official 125:23cc3068a9e4 37 #include "error.h"
mbed_official 125:23cc3068a9e4 38
mbed_official 125:23cc3068a9e4 39 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 125:23cc3068a9e4 40 {PA_11, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 125:23cc3068a9e4 41 {PB_5, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 125:23cc3068a9e4 42 {PB_15, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 125:23cc3068a9e4 43 {PC_12, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 125:23cc3068a9e4 44 {NC, NC, 0}
mbed_official 125:23cc3068a9e4 45 };
mbed_official 125:23cc3068a9e4 46
mbed_official 125:23cc3068a9e4 47 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 125:23cc3068a9e4 48 {PA_10, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 125:23cc3068a9e4 49 {PB_4, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 125:23cc3068a9e4 50 {PB_14, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 125:23cc3068a9e4 51 {PC_11, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 125:23cc3068a9e4 52 {NC, NC, 0}
mbed_official 125:23cc3068a9e4 53 };
mbed_official 125:23cc3068a9e4 54
mbed_official 125:23cc3068a9e4 55 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 125:23cc3068a9e4 56 {PB_3, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 125:23cc3068a9e4 57 {PB_13, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 125:23cc3068a9e4 58 {PC_10, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 125:23cc3068a9e4 59 {PF_1, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 125:23cc3068a9e4 60 {NC, NC, 0}
mbed_official 125:23cc3068a9e4 61 };
mbed_official 125:23cc3068a9e4 62
mbed_official 125:23cc3068a9e4 63 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 125:23cc3068a9e4 64 {PA_4, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 125:23cc3068a9e4 65 {PA_15, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_6)},
mbed_official 125:23cc3068a9e4 66 {PB_12, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 125:23cc3068a9e4 67 {PF_0, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_DOWN, GPIO_AF_5)},
mbed_official 125:23cc3068a9e4 68 {NC, NC, 0}
mbed_official 125:23cc3068a9e4 69 };
mbed_official 125:23cc3068a9e4 70
mbed_official 125:23cc3068a9e4 71 static void init_spi(spi_t *obj) {
mbed_official 125:23cc3068a9e4 72 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 125:23cc3068a9e4 73 SPI_InitTypeDef SPI_InitStructure;
mbed_official 125:23cc3068a9e4 74
mbed_official 125:23cc3068a9e4 75 SPI_Cmd(spi, DISABLE);
mbed_official 125:23cc3068a9e4 76
mbed_official 125:23cc3068a9e4 77 SPI_InitStructure.SPI_Mode = obj->mode;
mbed_official 125:23cc3068a9e4 78 SPI_InitStructure.SPI_NSS = obj->nss;
mbed_official 125:23cc3068a9e4 79 SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
mbed_official 125:23cc3068a9e4 80 SPI_InitStructure.SPI_DataSize = obj->bits;
mbed_official 125:23cc3068a9e4 81 SPI_InitStructure.SPI_CPOL = obj->cpol;
mbed_official 125:23cc3068a9e4 82 SPI_InitStructure.SPI_CPHA = obj->cpha;
mbed_official 125:23cc3068a9e4 83 SPI_InitStructure.SPI_BaudRatePrescaler = obj->br_presc;
mbed_official 125:23cc3068a9e4 84 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
mbed_official 125:23cc3068a9e4 85 SPI_InitStructure.SPI_CRCPolynomial = 7;
mbed_official 125:23cc3068a9e4 86 SPI_Init(spi, &SPI_InitStructure);
mbed_official 125:23cc3068a9e4 87
mbed_official 125:23cc3068a9e4 88 SPI_RxFIFOThresholdConfig(spi, SPI_RxFIFOThreshold_QF);
mbed_official 125:23cc3068a9e4 89
mbed_official 125:23cc3068a9e4 90 SPI_Cmd(spi, ENABLE);
mbed_official 125:23cc3068a9e4 91 }
mbed_official 125:23cc3068a9e4 92
mbed_official 125:23cc3068a9e4 93 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 125:23cc3068a9e4 94 // Determine the SPI to use
mbed_official 125:23cc3068a9e4 95 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 125:23cc3068a9e4 96 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 125:23cc3068a9e4 97 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 125:23cc3068a9e4 98 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 125:23cc3068a9e4 99
mbed_official 125:23cc3068a9e4 100 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 125:23cc3068a9e4 101 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 125:23cc3068a9e4 102
mbed_official 125:23cc3068a9e4 103 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 125:23cc3068a9e4 104
mbed_official 125:23cc3068a9e4 105 if (obj->spi == (SPIName)NC) {
mbed_official 125:23cc3068a9e4 106 error("SPI pinout mapping failed");
mbed_official 125:23cc3068a9e4 107 }
mbed_official 125:23cc3068a9e4 108
mbed_official 125:23cc3068a9e4 109 // Enable SPI clock
mbed_official 125:23cc3068a9e4 110 if (obj->spi == SPI_2) {
mbed_official 125:23cc3068a9e4 111 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 125:23cc3068a9e4 112 }
mbed_official 125:23cc3068a9e4 113 if (obj->spi == SPI_3) {
mbed_official 125:23cc3068a9e4 114 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
mbed_official 125:23cc3068a9e4 115 }
mbed_official 125:23cc3068a9e4 116
mbed_official 125:23cc3068a9e4 117 // Configure the SPI pins
mbed_official 125:23cc3068a9e4 118 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 125:23cc3068a9e4 119 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 125:23cc3068a9e4 120 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 125:23cc3068a9e4 121
mbed_official 125:23cc3068a9e4 122 // Save new values
mbed_official 125:23cc3068a9e4 123 obj->bits = SPI_DataSize_8b;
mbed_official 125:23cc3068a9e4 124 obj->cpol = SPI_CPOL_Low;
mbed_official 125:23cc3068a9e4 125 obj->cpha = SPI_CPHA_1Edge;
mbed_official 125:23cc3068a9e4 126 obj->br_presc = SPI_BaudRatePrescaler_256;
mbed_official 125:23cc3068a9e4 127
mbed_official 125:23cc3068a9e4 128 if (ssel == NC) { // Master
mbed_official 125:23cc3068a9e4 129 obj->mode = SPI_Mode_Master;
mbed_official 125:23cc3068a9e4 130 obj->nss = SPI_NSS_Soft;
mbed_official 125:23cc3068a9e4 131 }
mbed_official 125:23cc3068a9e4 132 else { // Slave
mbed_official 125:23cc3068a9e4 133 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 125:23cc3068a9e4 134 obj->mode = SPI_Mode_Slave;
mbed_official 125:23cc3068a9e4 135 obj->nss = SPI_NSS_Soft;
mbed_official 125:23cc3068a9e4 136 }
mbed_official 125:23cc3068a9e4 137
mbed_official 125:23cc3068a9e4 138 init_spi(obj);
mbed_official 125:23cc3068a9e4 139 }
mbed_official 125:23cc3068a9e4 140
mbed_official 125:23cc3068a9e4 141 void spi_free(spi_t *obj) {
mbed_official 125:23cc3068a9e4 142 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 125:23cc3068a9e4 143 SPI_I2S_DeInit(spi);
mbed_official 125:23cc3068a9e4 144 }
mbed_official 125:23cc3068a9e4 145
mbed_official 125:23cc3068a9e4 146 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 125:23cc3068a9e4 147 // Save new values
mbed_official 125:23cc3068a9e4 148 if (bits == 8) {
mbed_official 125:23cc3068a9e4 149 obj->bits = SPI_DataSize_8b;
mbed_official 125:23cc3068a9e4 150 }
mbed_official 125:23cc3068a9e4 151 else {
mbed_official 125:23cc3068a9e4 152 obj->bits = SPI_DataSize_16b;
mbed_official 125:23cc3068a9e4 153 }
mbed_official 125:23cc3068a9e4 154
mbed_official 125:23cc3068a9e4 155 switch (mode) {
mbed_official 125:23cc3068a9e4 156 case 0:
mbed_official 125:23cc3068a9e4 157 obj->cpol = SPI_CPOL_Low;
mbed_official 125:23cc3068a9e4 158 obj->cpha = SPI_CPHA_1Edge;
mbed_official 125:23cc3068a9e4 159 break;
mbed_official 125:23cc3068a9e4 160 case 1:
mbed_official 125:23cc3068a9e4 161 obj->cpol = SPI_CPOL_Low;
mbed_official 125:23cc3068a9e4 162 obj->cpha = SPI_CPHA_2Edge;
mbed_official 125:23cc3068a9e4 163 break;
mbed_official 125:23cc3068a9e4 164 case 2:
mbed_official 125:23cc3068a9e4 165 obj->cpol = SPI_CPOL_High;
mbed_official 125:23cc3068a9e4 166 obj->cpha = SPI_CPHA_1Edge;
mbed_official 125:23cc3068a9e4 167 break;
mbed_official 125:23cc3068a9e4 168 default:
mbed_official 125:23cc3068a9e4 169 obj->cpol = SPI_CPOL_High;
mbed_official 125:23cc3068a9e4 170 obj->cpha = SPI_CPHA_2Edge;
mbed_official 125:23cc3068a9e4 171 break;
mbed_official 125:23cc3068a9e4 172 }
mbed_official 125:23cc3068a9e4 173
mbed_official 125:23cc3068a9e4 174 if (slave == 0) {
mbed_official 125:23cc3068a9e4 175 obj->mode = SPI_Mode_Master;
mbed_official 125:23cc3068a9e4 176 obj->nss = SPI_NSS_Soft;
mbed_official 125:23cc3068a9e4 177 }
mbed_official 125:23cc3068a9e4 178 else {
mbed_official 125:23cc3068a9e4 179 obj->mode = SPI_Mode_Slave;
mbed_official 125:23cc3068a9e4 180 obj->nss = SPI_NSS_Hard;
mbed_official 125:23cc3068a9e4 181 }
mbed_official 125:23cc3068a9e4 182
mbed_official 125:23cc3068a9e4 183 init_spi(obj);
mbed_official 125:23cc3068a9e4 184 }
mbed_official 125:23cc3068a9e4 185
mbed_official 125:23cc3068a9e4 186 void spi_frequency(spi_t *obj, int hz) {
mbed_official 125:23cc3068a9e4 187 // Note: The frequencies are obtained with SPI2 clock = 32 MHz (APB1 clock)
mbed_official 125:23cc3068a9e4 188 if (hz < 250000) {
mbed_official 125:23cc3068a9e4 189 obj->br_presc = SPI_BaudRatePrescaler_256; // 125 kHz
mbed_official 125:23cc3068a9e4 190 }
mbed_official 125:23cc3068a9e4 191 else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 125:23cc3068a9e4 192 obj->br_presc = SPI_BaudRatePrescaler_128; // 250 kHz
mbed_official 125:23cc3068a9e4 193 }
mbed_official 125:23cc3068a9e4 194 else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 125:23cc3068a9e4 195 obj->br_presc = SPI_BaudRatePrescaler_64; // 500 kHz
mbed_official 125:23cc3068a9e4 196 }
mbed_official 125:23cc3068a9e4 197 else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 125:23cc3068a9e4 198 obj->br_presc = SPI_BaudRatePrescaler_32; // 1 MHz
mbed_official 125:23cc3068a9e4 199 }
mbed_official 125:23cc3068a9e4 200 else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 125:23cc3068a9e4 201 obj->br_presc = SPI_BaudRatePrescaler_16; // 2 MHz
mbed_official 125:23cc3068a9e4 202 }
mbed_official 125:23cc3068a9e4 203 else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 125:23cc3068a9e4 204 obj->br_presc = SPI_BaudRatePrescaler_8; // 4 MHz
mbed_official 125:23cc3068a9e4 205 }
mbed_official 125:23cc3068a9e4 206 else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 125:23cc3068a9e4 207 obj->br_presc = SPI_BaudRatePrescaler_4; // 8 MHz
mbed_official 125:23cc3068a9e4 208 }
mbed_official 125:23cc3068a9e4 209 else { // >= 16000000
mbed_official 125:23cc3068a9e4 210 obj->br_presc = SPI_BaudRatePrescaler_2; // 16 MHz
mbed_official 125:23cc3068a9e4 211 }
mbed_official 125:23cc3068a9e4 212 init_spi(obj);
mbed_official 125:23cc3068a9e4 213 }
mbed_official 125:23cc3068a9e4 214
mbed_official 125:23cc3068a9e4 215 static inline int ssp_readable(spi_t *obj) {
mbed_official 125:23cc3068a9e4 216 int status;
mbed_official 125:23cc3068a9e4 217 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 125:23cc3068a9e4 218 // Check if data is received
mbed_official 125:23cc3068a9e4 219 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 125:23cc3068a9e4 220 return status;
mbed_official 125:23cc3068a9e4 221 }
mbed_official 125:23cc3068a9e4 222
mbed_official 125:23cc3068a9e4 223 static inline int ssp_writeable(spi_t *obj) {
mbed_official 125:23cc3068a9e4 224 int status;
mbed_official 125:23cc3068a9e4 225 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 125:23cc3068a9e4 226 // Check if data is transmitted
mbed_official 125:23cc3068a9e4 227 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 125:23cc3068a9e4 228 return status;
mbed_official 125:23cc3068a9e4 229 }
mbed_official 125:23cc3068a9e4 230
mbed_official 125:23cc3068a9e4 231 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 125:23cc3068a9e4 232 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 125:23cc3068a9e4 233 while (!ssp_writeable(obj));
mbed_official 125:23cc3068a9e4 234 if (obj->bits == SPI_DataSize_8b) {
mbed_official 125:23cc3068a9e4 235 SPI_SendData8(spi, (uint8_t)value);
mbed_official 125:23cc3068a9e4 236 }
mbed_official 125:23cc3068a9e4 237 else {
mbed_official 125:23cc3068a9e4 238 SPI_I2S_SendData16(spi, (uint16_t)value);
mbed_official 125:23cc3068a9e4 239 }
mbed_official 125:23cc3068a9e4 240 }
mbed_official 125:23cc3068a9e4 241
mbed_official 125:23cc3068a9e4 242 static inline int ssp_read(spi_t *obj) {
mbed_official 125:23cc3068a9e4 243 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 125:23cc3068a9e4 244 while (!ssp_readable(obj));
mbed_official 125:23cc3068a9e4 245 if (obj->bits == SPI_DataSize_8b) {
mbed_official 125:23cc3068a9e4 246 return (int)SPI_ReceiveData8(spi);
mbed_official 125:23cc3068a9e4 247 }
mbed_official 125:23cc3068a9e4 248 else {
mbed_official 125:23cc3068a9e4 249 return (int)SPI_I2S_ReceiveData16(spi);
mbed_official 125:23cc3068a9e4 250 }
mbed_official 125:23cc3068a9e4 251 }
mbed_official 125:23cc3068a9e4 252
mbed_official 125:23cc3068a9e4 253 static inline int ssp_busy(spi_t *obj) {
mbed_official 125:23cc3068a9e4 254 int status;
mbed_official 125:23cc3068a9e4 255 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 125:23cc3068a9e4 256 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 125:23cc3068a9e4 257 return status;
mbed_official 125:23cc3068a9e4 258 }
mbed_official 125:23cc3068a9e4 259
mbed_official 125:23cc3068a9e4 260 int spi_master_write(spi_t *obj, int value) {
mbed_official 125:23cc3068a9e4 261 ssp_write(obj, value);
mbed_official 125:23cc3068a9e4 262 return ssp_read(obj);
mbed_official 125:23cc3068a9e4 263 }
mbed_official 125:23cc3068a9e4 264
mbed_official 125:23cc3068a9e4 265 int spi_slave_receive(spi_t *obj) {
mbed_official 125:23cc3068a9e4 266 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 125:23cc3068a9e4 267 };
mbed_official 125:23cc3068a9e4 268
mbed_official 125:23cc3068a9e4 269 int spi_slave_read(spi_t *obj) {
mbed_official 125:23cc3068a9e4 270 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 125:23cc3068a9e4 271 if (obj->bits == SPI_DataSize_8b) {
mbed_official 125:23cc3068a9e4 272 return (int)SPI_ReceiveData8(spi);
mbed_official 125:23cc3068a9e4 273 }
mbed_official 125:23cc3068a9e4 274 else {
mbed_official 125:23cc3068a9e4 275 return (int)SPI_I2S_ReceiveData16(spi);
mbed_official 125:23cc3068a9e4 276 }
mbed_official 125:23cc3068a9e4 277 }
mbed_official 125:23cc3068a9e4 278
mbed_official 125:23cc3068a9e4 279 void spi_slave_write(spi_t *obj, int value) {
mbed_official 125:23cc3068a9e4 280 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 125:23cc3068a9e4 281 while (!ssp_writeable(obj));
mbed_official 125:23cc3068a9e4 282 if (obj->bits == SPI_DataSize_8b) {
mbed_official 125:23cc3068a9e4 283 SPI_SendData8(spi, (uint8_t)value);
mbed_official 125:23cc3068a9e4 284 }
mbed_official 125:23cc3068a9e4 285 else {
mbed_official 125:23cc3068a9e4 286 SPI_I2S_SendData16(spi, (uint16_t)value);
mbed_official 125:23cc3068a9e4 287 }
mbed_official 125:23cc3068a9e4 288 }
mbed_official 125:23cc3068a9e4 289
mbed_official 125:23cc3068a9e4 290 int spi_busy(spi_t *obj) {
mbed_official 125:23cc3068a9e4 291 return ssp_busy(obj);
mbed_official 125:23cc3068a9e4 292 }
mbed_official 125:23cc3068a9e4 293
mbed_official 125:23cc3068a9e4 294 #endif