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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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_F103RB/spi_api.c@440:8a0b45cd594f, 2014-12-16 (annotated)

Committer:
mbed_official
Date:
Tue Dec 16 08:15:08 2014 +0000
Revision:
440:8a0b45cd594f
Parent:
414:4ec4c5b614b0
Child:
489:119543c9f674
Synchronized with git revision 67fbbf0b635d0c0d93fbe433306c537c2ad206aa



Full URL: https://github.com/mbedmicro/mbed/commit/67fbbf0b635d0c0d93fbe433306c537c2ad206aa/



Targets: nrf51 - updating app_timer.c from Norid'c SDKv7.1.0

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 414:4ec4c5b614b0 38 #include "PeripheralPins.h"
mbed_official 52:a51c77007319 39
mbed_official 402:09075a3b15e3 40 static void init_spi(spi_t *obj)
mbed_official 402:09075a3b15e3 41 {
mbed_official 56:99eb381a3269 42 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 56:99eb381a3269 43 SPI_InitTypeDef SPI_InitStructure;
mbed_official 56:99eb381a3269 44
mbed_official 56:99eb381a3269 45 SPI_Cmd(spi, DISABLE);
mbed_official 52:a51c77007319 46
mbed_official 139:e3413eddde57 47 SPI_InitStructure.SPI_Mode = obj->mode;
mbed_official 139:e3413eddde57 48 SPI_InitStructure.SPI_NSS = obj->nss;
mbed_official 174:8bb9f3a33240 49 SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
mbed_official 139:e3413eddde57 50 SPI_InitStructure.SPI_DataSize = obj->bits;
mbed_official 139:e3413eddde57 51 SPI_InitStructure.SPI_CPOL = obj->cpol;
mbed_official 139:e3413eddde57 52 SPI_InitStructure.SPI_CPHA = obj->cpha;
mbed_official 56:99eb381a3269 53 SPI_InitStructure.SPI_BaudRatePrescaler = obj->br_presc;
mbed_official 139:e3413eddde57 54 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
mbed_official 139:e3413eddde57 55 SPI_InitStructure.SPI_CRCPolynomial = 7;
mbed_official 56:99eb381a3269 56 SPI_Init(spi, &SPI_InitStructure);
mbed_official 56:99eb381a3269 57
mbed_official 56:99eb381a3269 58 SPI_Cmd(spi, ENABLE);
mbed_official 56:99eb381a3269 59 }
mbed_official 56:99eb381a3269 60
mbed_official 402:09075a3b15e3 61 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 402:09075a3b15e3 62 {
mbed_official 52:a51c77007319 63 // Determine the SPI to use
mbed_official 52:a51c77007319 64 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 52:a51c77007319 65 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 52:a51c77007319 66 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 52:a51c77007319 67 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 174:8bb9f3a33240 68
mbed_official 52:a51c77007319 69 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 52:a51c77007319 70 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 174:8bb9f3a33240 71
mbed_official 52:a51c77007319 72 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 227:7bd0639b8911 73 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 174:8bb9f3a33240 74
mbed_official 52:a51c77007319 75 // Enable SPI clock
mbed_official 52:a51c77007319 76 if (obj->spi == SPI_1) {
mbed_official 174:8bb9f3a33240 77 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 52:a51c77007319 78 }
mbed_official 139:e3413eddde57 79 if (obj->spi == SPI_2) {
mbed_official 139:e3413eddde57 80 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 139:e3413eddde57 81 }
mbed_official 139:e3413eddde57 82
mbed_official 52:a51c77007319 83 // Configure the SPI pins
mbed_official 52:a51c77007319 84 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 52:a51c77007319 85 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 52:a51c77007319 86 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 174:8bb9f3a33240 87
mbed_official 52:a51c77007319 88 // Save new values
mbed_official 52:a51c77007319 89 obj->bits = SPI_DataSize_8b;
mbed_official 52:a51c77007319 90 obj->cpol = SPI_CPOL_Low;
mbed_official 52:a51c77007319 91 obj->cpha = SPI_CPHA_1Edge;
mbed_official 139:e3413eddde57 92 obj->br_presc = SPI_BaudRatePrescaler_256;
mbed_official 174:8bb9f3a33240 93
mbed_official 208:4557f4bb2dd5 94 obj->pin_miso = miso;
mbed_official 208:4557f4bb2dd5 95 obj->pin_mosi = mosi;
mbed_official 208:4557f4bb2dd5 96 obj->pin_sclk = sclk;
mbed_official 208:4557f4bb2dd5 97 obj->pin_ssel = ssel;
mbed_official 208:4557f4bb2dd5 98
mbed_official 52:a51c77007319 99 if (ssel == NC) { // Master
mbed_official 52:a51c77007319 100 obj->mode = SPI_Mode_Master;
mbed_official 52:a51c77007319 101 obj->nss = SPI_NSS_Soft;
mbed_official 174:8bb9f3a33240 102 } else { // Slave
mbed_official 52:a51c77007319 103 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 52:a51c77007319 104 obj->mode = SPI_Mode_Slave;
mbed_official 181:a4cbdfbbd2f4 105 obj->nss = SPI_NSS_Hard;
mbed_official 52:a51c77007319 106 }
mbed_official 52:a51c77007319 107
mbed_official 56:99eb381a3269 108 init_spi(obj);
mbed_official 52:a51c77007319 109 }
mbed_official 52:a51c77007319 110
mbed_official 402:09075a3b15e3 111 void spi_free(spi_t *obj)
mbed_official 402:09075a3b15e3 112 {
mbed_official 208:4557f4bb2dd5 113 // Reset SPI and disable clock
mbed_official 208:4557f4bb2dd5 114 if (obj->spi == SPI_1) {
mbed_official 208:4557f4bb2dd5 115 RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 208:4557f4bb2dd5 116 RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, DISABLE);
mbed_official 208:4557f4bb2dd5 117 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, DISABLE);
mbed_official 208:4557f4bb2dd5 118 }
mbed_official 208:4557f4bb2dd5 119
mbed_official 208:4557f4bb2dd5 120 if (obj->spi == SPI_2) {
mbed_official 208:4557f4bb2dd5 121 RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 208:4557f4bb2dd5 122 RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, DISABLE);
mbed_official 208:4557f4bb2dd5 123 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, DISABLE);
mbed_official 208:4557f4bb2dd5 124 }
mbed_official 208:4557f4bb2dd5 125
mbed_official 208:4557f4bb2dd5 126 // Configure GPIOs
mbed_official 208:4557f4bb2dd5 127 pin_function(obj->pin_miso, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0));
mbed_official 208:4557f4bb2dd5 128 pin_function(obj->pin_mosi, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0));
mbed_official 208:4557f4bb2dd5 129 pin_function(obj->pin_sclk, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0));
mbed_official 208:4557f4bb2dd5 130 pin_function(obj->pin_ssel, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0));
mbed_official 52:a51c77007319 131 }
mbed_official 52:a51c77007319 132
mbed_official 402:09075a3b15e3 133 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 402:09075a3b15e3 134 {
mbed_official 52:a51c77007319 135 // Save new values
mbed_official 233:1bbc1451db33 136 if (bits == 16) {
mbed_official 233:1bbc1451db33 137 obj->bits = SPI_DataSize_16b;
mbed_official 233:1bbc1451db33 138 } else {
mbed_official 52:a51c77007319 139 obj->bits = SPI_DataSize_8b;
mbed_official 52:a51c77007319 140 }
mbed_official 174:8bb9f3a33240 141
mbed_official 52:a51c77007319 142 switch (mode) {
mbed_official 52:a51c77007319 143 case 0:
mbed_official 174:8bb9f3a33240 144 obj->cpol = SPI_CPOL_Low;
mbed_official 174:8bb9f3a33240 145 obj->cpha = SPI_CPHA_1Edge;
mbed_official 174:8bb9f3a33240 146 break;
mbed_official 52:a51c77007319 147 case 1:
mbed_official 174:8bb9f3a33240 148 obj->cpol = SPI_CPOL_Low;
mbed_official 174:8bb9f3a33240 149 obj->cpha = SPI_CPHA_2Edge;
mbed_official 174:8bb9f3a33240 150 break;
mbed_official 52:a51c77007319 151 case 2:
mbed_official 174:8bb9f3a33240 152 obj->cpol = SPI_CPOL_High;
mbed_official 174:8bb9f3a33240 153 obj->cpha = SPI_CPHA_1Edge;
mbed_official 174:8bb9f3a33240 154 break;
mbed_official 52:a51c77007319 155 default:
mbed_official 174:8bb9f3a33240 156 obj->cpol = SPI_CPOL_High;
mbed_official 174:8bb9f3a33240 157 obj->cpha = SPI_CPHA_2Edge;
mbed_official 174:8bb9f3a33240 158 break;
mbed_official 52:a51c77007319 159 }
mbed_official 174:8bb9f3a33240 160
mbed_official 52:a51c77007319 161 if (slave == 0) {
mbed_official 52:a51c77007319 162 obj->mode = SPI_Mode_Master;
mbed_official 52:a51c77007319 163 obj->nss = SPI_NSS_Soft;
mbed_official 174:8bb9f3a33240 164 } else {
mbed_official 52:a51c77007319 165 obj->mode = SPI_Mode_Slave;
mbed_official 174:8bb9f3a33240 166 obj->nss = SPI_NSS_Hard;
mbed_official 52:a51c77007319 167 }
mbed_official 174:8bb9f3a33240 168
mbed_official 56:99eb381a3269 169 init_spi(obj);
mbed_official 52:a51c77007319 170 }
mbed_official 52:a51c77007319 171
mbed_official 402:09075a3b15e3 172 void spi_frequency(spi_t *obj, int hz)
mbed_official 402:09075a3b15e3 173 {
mbed_official 139:e3413eddde57 174 if (obj->spi == SPI_1) {
mbed_official 139:e3413eddde57 175 // Values depend of PCLK2: 64 MHz if HSI is used, 72 MHz if HSE is used
mbed_official 139:e3413eddde57 176 if (hz < 500000) {
mbed_official 139:e3413eddde57 177 obj->br_presc = SPI_BaudRatePrescaler_256; // 250 kHz - 281 kHz
mbed_official 174:8bb9f3a33240 178 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 179 obj->br_presc = SPI_BaudRatePrescaler_128; // 500 kHz - 563 kHz
mbed_official 174:8bb9f3a33240 180 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 139:e3413eddde57 181 obj->br_presc = SPI_BaudRatePrescaler_64; // 1 MHz - 1.13 MHz
mbed_official 174:8bb9f3a33240 182 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 139:e3413eddde57 183 obj->br_presc = SPI_BaudRatePrescaler_32; // 2 MHz - 2.25 MHz
mbed_official 174:8bb9f3a33240 184 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 139:e3413eddde57 185 obj->br_presc = SPI_BaudRatePrescaler_16; // 4 MHz - 4.5 MHz
mbed_official 174:8bb9f3a33240 186 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 139:e3413eddde57 187 obj->br_presc = SPI_BaudRatePrescaler_8; // 8 MHz - 9 MHz
mbed_official 174:8bb9f3a33240 188 } else if ((hz >= 16000000) && (hz < 32000000)) {
mbed_official 139:e3413eddde57 189 obj->br_presc = SPI_BaudRatePrescaler_4; // 16 MHz - 18 MHz
mbed_official 174:8bb9f3a33240 190 } else { // >= 32000000
mbed_official 139:e3413eddde57 191 obj->br_presc = SPI_BaudRatePrescaler_2; // 32 MHz - 36 MHz
mbed_official 139:e3413eddde57 192 }
mbed_official 139:e3413eddde57 193 }
mbed_official 174:8bb9f3a33240 194
mbed_official 139:e3413eddde57 195 if (obj->spi == SPI_2) {
mbed_official 139:e3413eddde57 196 // Values depend of PCLK1: 32 MHz if HSI is used, 36 MHz if HSE is used
mbed_official 139:e3413eddde57 197 if (hz < 250000) {
mbed_official 139:e3413eddde57 198 obj->br_presc = SPI_BaudRatePrescaler_256; // 125 kHz - 141 kHz
mbed_official 174:8bb9f3a33240 199 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 139:e3413eddde57 200 obj->br_presc = SPI_BaudRatePrescaler_128; // 250 kHz - 281 kHz
mbed_official 174:8bb9f3a33240 201 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 202 obj->br_presc = SPI_BaudRatePrescaler_64; // 500 kHz - 563 kHz
mbed_official 174:8bb9f3a33240 203 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 139:e3413eddde57 204 obj->br_presc = SPI_BaudRatePrescaler_32; // 1 MHz - 1.13 MHz
mbed_official 174:8bb9f3a33240 205 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 139:e3413eddde57 206 obj->br_presc = SPI_BaudRatePrescaler_16; // 2 MHz - 2.25 MHz
mbed_official 174:8bb9f3a33240 207 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 139:e3413eddde57 208 obj->br_presc = SPI_BaudRatePrescaler_8; // 4 MHz - 4.5 MHz
mbed_official 174:8bb9f3a33240 209 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 139:e3413eddde57 210 obj->br_presc = SPI_BaudRatePrescaler_4; // 8 MHz - 9 MHz
mbed_official 174:8bb9f3a33240 211 } else { // >= 16000000
mbed_official 139:e3413eddde57 212 obj->br_presc = SPI_BaudRatePrescaler_2; // 16 MHz - 18 MHz
mbed_official 139:e3413eddde57 213 }
mbed_official 139:e3413eddde57 214 }
mbed_official 52:a51c77007319 215
mbed_official 56:99eb381a3269 216 init_spi(obj);
mbed_official 52:a51c77007319 217 }
mbed_official 52:a51c77007319 218
mbed_official 402:09075a3b15e3 219 static inline int ssp_readable(spi_t *obj)
mbed_official 402:09075a3b15e3 220 {
mbed_official 52:a51c77007319 221 int status;
mbed_official 52:a51c77007319 222 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 223 // Check if data is received
mbed_official 52:a51c77007319 224 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 174:8bb9f3a33240 225 return status;
mbed_official 52:a51c77007319 226 }
mbed_official 52:a51c77007319 227
mbed_official 402:09075a3b15e3 228 static inline int ssp_writeable(spi_t *obj)
mbed_official 402:09075a3b15e3 229 {
mbed_official 52:a51c77007319 230 int status;
mbed_official 52:a51c77007319 231 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 232 // Check if data is transmitted
mbed_official 52:a51c77007319 233 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 52:a51c77007319 234 return status;
mbed_official 52:a51c77007319 235 }
mbed_official 52:a51c77007319 236
mbed_official 402:09075a3b15e3 237 static inline void ssp_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 238 {
mbed_official 174:8bb9f3a33240 239 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 240 while (!ssp_writeable(obj));
mbed_official 52:a51c77007319 241 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 52:a51c77007319 242 }
mbed_official 52:a51c77007319 243
mbed_official 402:09075a3b15e3 244 static inline int ssp_read(spi_t *obj)
mbed_official 402:09075a3b15e3 245 {
mbed_official 174:8bb9f3a33240 246 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 247 while (!ssp_readable(obj));
mbed_official 52:a51c77007319 248 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 52:a51c77007319 249 }
mbed_official 52:a51c77007319 250
mbed_official 402:09075a3b15e3 251 static inline int ssp_busy(spi_t *obj)
mbed_official 402:09075a3b15e3 252 {
mbed_official 52:a51c77007319 253 int status;
mbed_official 52:a51c77007319 254 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 255 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 52:a51c77007319 256 return status;
mbed_official 52:a51c77007319 257 }
mbed_official 52:a51c77007319 258
mbed_official 402:09075a3b15e3 259 int spi_master_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 260 {
mbed_official 52:a51c77007319 261 ssp_write(obj, value);
mbed_official 52:a51c77007319 262 return ssp_read(obj);
mbed_official 52:a51c77007319 263 }
mbed_official 52:a51c77007319 264
mbed_official 402:09075a3b15e3 265 int spi_slave_receive(spi_t *obj)
mbed_official 402:09075a3b15e3 266 {
mbed_official 233:1bbc1451db33 267 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 52:a51c77007319 268 };
mbed_official 52:a51c77007319 269
mbed_official 402:09075a3b15e3 270 int spi_slave_read(spi_t *obj)
mbed_official 402:09075a3b15e3 271 {
mbed_official 52:a51c77007319 272 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 273 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 52:a51c77007319 274 }
mbed_official 52:a51c77007319 275
mbed_official 402:09075a3b15e3 276 void spi_slave_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 277 {
mbed_official 174:8bb9f3a33240 278 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 174:8bb9f3a33240 279 while (!ssp_writeable(obj));
mbed_official 52:a51c77007319 280 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 52:a51c77007319 281 }
mbed_official 52:a51c77007319 282
mbed_official 402:09075a3b15e3 283 int spi_busy(spi_t *obj)
mbed_official 402:09075a3b15e3 284 {
mbed_official 52:a51c77007319 285 return ssp_busy(obj);
mbed_official 52:a51c77007319 286 }
mbed_official 52:a51c77007319 287
mbed_official 52:a51c77007319 288 #endif