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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_STM32F1/spi_api.c@635:a11c0372f0ba, 2015-09-30 (annotated)

Committer:
mbed_official
Date:
Wed Sep 30 17:00:09 2015 +0100
Revision:
635:a11c0372f0ba
Parent:
552:a1b9575155a3 
Synchronized with git revision d29c98dae61be0946ddf3a3c641c7726056f9452



Full URL: https://github.com/mbedmicro/mbed/commit/d29c98dae61be0946ddf3a3c641c7726056f9452/



Added support for SAMW25

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 489:119543c9f674 40 static SPI_HandleTypeDef SpiHandle;
mbed_official 489:119543c9f674 41
mbed_official 402:09075a3b15e3 42 static void init_spi(spi_t *obj)
mbed_official 402:09075a3b15e3 43 {
mbed_official 489:119543c9f674 44 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 56:99eb381a3269 45
mbed_official 489:119543c9f674 46 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 52:a51c77007319 47
mbed_official 489:119543c9f674 48 SpiHandle.Init.Mode = obj->mode;
mbed_official 489:119543c9f674 49 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 489:119543c9f674 50 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 489:119543c9f674 51 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 489:119543c9f674 52 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 489:119543c9f674 53 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 489:119543c9f674 54 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 489:119543c9f674 55 SpiHandle.Init.DataSize = obj->bits;
mbed_official 489:119543c9f674 56 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 489:119543c9f674 57 SpiHandle.Init.NSS = obj->nss;
mbed_official 489:119543c9f674 58 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 56:99eb381a3269 59
mbed_official 489:119543c9f674 60 HAL_SPI_Init(&SpiHandle);
mbed_official 489:119543c9f674 61
mbed_official 489:119543c9f674 62 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 56:99eb381a3269 63 }
mbed_official 56:99eb381a3269 64
mbed_official 402:09075a3b15e3 65 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 402:09075a3b15e3 66 {
mbed_official 52:a51c77007319 67 // Determine the SPI to use
mbed_official 52:a51c77007319 68 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 52:a51c77007319 69 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 52:a51c77007319 70 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 52:a51c77007319 71 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 174:8bb9f3a33240 72
mbed_official 52:a51c77007319 73 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 52:a51c77007319 74 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 174:8bb9f3a33240 75
mbed_official 52:a51c77007319 76 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 227:7bd0639b8911 77 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 174:8bb9f3a33240 78
mbed_official 52:a51c77007319 79 // Enable SPI clock
mbed_official 52:a51c77007319 80 if (obj->spi == SPI_1) {
mbed_official 489:119543c9f674 81 __SPI1_CLK_ENABLE();
mbed_official 52:a51c77007319 82 }
mbed_official 139:e3413eddde57 83 if (obj->spi == SPI_2) {
mbed_official 489:119543c9f674 84 __SPI2_CLK_ENABLE();
mbed_official 139:e3413eddde57 85 }
mbed_official 139:e3413eddde57 86
mbed_official 52:a51c77007319 87 // Configure the SPI pins
mbed_official 52:a51c77007319 88 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 52:a51c77007319 89 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 52:a51c77007319 90 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 174:8bb9f3a33240 91
mbed_official 52:a51c77007319 92 // Save new values
mbed_official 489:119543c9f674 93 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 489:119543c9f674 94 obj->cpol = SPI_POLARITY_LOW;
mbed_official 489:119543c9f674 95 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 489:119543c9f674 96 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 174:8bb9f3a33240 97
mbed_official 208:4557f4bb2dd5 98 obj->pin_miso = miso;
mbed_official 208:4557f4bb2dd5 99 obj->pin_mosi = mosi;
mbed_official 208:4557f4bb2dd5 100 obj->pin_sclk = sclk;
mbed_official 208:4557f4bb2dd5 101 obj->pin_ssel = ssel;
mbed_official 208:4557f4bb2dd5 102
mbed_official 552:a1b9575155a3 103 if (ssel != NC) {
mbed_official 552:a1b9575155a3 104 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 552:a1b9575155a3 105 } else {
mbed_official 489:119543c9f674 106 obj->nss = SPI_NSS_SOFT;
mbed_official 52:a51c77007319 107 }
mbed_official 52:a51c77007319 108
mbed_official 56:99eb381a3269 109 init_spi(obj);
mbed_official 52:a51c77007319 110 }
mbed_official 52:a51c77007319 111
mbed_official 402:09075a3b15e3 112 void spi_free(spi_t *obj)
mbed_official 402:09075a3b15e3 113 {
mbed_official 208:4557f4bb2dd5 114 // Reset SPI and disable clock
mbed_official 208:4557f4bb2dd5 115 if (obj->spi == SPI_1) {
mbed_official 489:119543c9f674 116 __SPI1_FORCE_RESET();
mbed_official 489:119543c9f674 117 __SPI1_RELEASE_RESET();
mbed_official 489:119543c9f674 118 __SPI1_CLK_DISABLE();
mbed_official 208:4557f4bb2dd5 119 }
mbed_official 208:4557f4bb2dd5 120
mbed_official 208:4557f4bb2dd5 121 if (obj->spi == SPI_2) {
mbed_official 489:119543c9f674 122 __SPI2_FORCE_RESET();
mbed_official 489:119543c9f674 123 __SPI2_RELEASE_RESET();
mbed_official 489:119543c9f674 124 __SPI2_CLK_DISABLE();
mbed_official 208:4557f4bb2dd5 125 }
mbed_official 208:4557f4bb2dd5 126
mbed_official 208:4557f4bb2dd5 127 // Configure GPIOs
mbed_official 489:119543c9f674 128 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 489:119543c9f674 129 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 489:119543c9f674 130 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 489:119543c9f674 131 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 52:a51c77007319 132 }
mbed_official 52:a51c77007319 133
mbed_official 402:09075a3b15e3 134 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 402:09075a3b15e3 135 {
mbed_official 52:a51c77007319 136 // Save new values
mbed_official 233:1bbc1451db33 137 if (bits == 16) {
mbed_official 489:119543c9f674 138 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 233:1bbc1451db33 139 } else {
mbed_official 489:119543c9f674 140 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 52:a51c77007319 141 }
mbed_official 174:8bb9f3a33240 142
mbed_official 52:a51c77007319 143 switch (mode) {
mbed_official 52:a51c77007319 144 case 0:
mbed_official 489:119543c9f674 145 obj->cpol = SPI_POLARITY_LOW;
mbed_official 489:119543c9f674 146 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 174:8bb9f3a33240 147 break;
mbed_official 52:a51c77007319 148 case 1:
mbed_official 489:119543c9f674 149 obj->cpol = SPI_POLARITY_LOW;
mbed_official 489:119543c9f674 150 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 174:8bb9f3a33240 151 break;
mbed_official 52:a51c77007319 152 case 2:
mbed_official 489:119543c9f674 153 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 489:119543c9f674 154 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 174:8bb9f3a33240 155 break;
mbed_official 52:a51c77007319 156 default:
mbed_official 489:119543c9f674 157 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 489:119543c9f674 158 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 174:8bb9f3a33240 159 break;
mbed_official 52:a51c77007319 160 }
mbed_official 174:8bb9f3a33240 161
mbed_official 552:a1b9575155a3 162 if (obj->nss != SPI_NSS_SOFT) {
mbed_official 552:a1b9575155a3 163 obj->nss = (slave) ? SPI_NSS_HARD_INPUT : SPI_NSS_HARD_OUTPUT;
mbed_official 52:a51c77007319 164 }
mbed_official 174:8bb9f3a33240 165
mbed_official 552:a1b9575155a3 166 obj->mode = (slave) ? SPI_MODE_SLAVE : SPI_MODE_MASTER;
mbed_official 552:a1b9575155a3 167
mbed_official 56:99eb381a3269 168 init_spi(obj);
mbed_official 52:a51c77007319 169 }
mbed_official 52:a51c77007319 170
mbed_official 402:09075a3b15e3 171 void spi_frequency(spi_t *obj, int hz)
mbed_official 402:09075a3b15e3 172 {
mbed_official 139:e3413eddde57 173 if (obj->spi == SPI_1) {
mbed_official 139:e3413eddde57 174 // Values depend of PCLK2: 64 MHz if HSI is used, 72 MHz if HSE is used
mbed_official 139:e3413eddde57 175 if (hz < 500000) {
mbed_official 489:119543c9f674 176 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 250 kHz - 281 kHz
mbed_official 174:8bb9f3a33240 177 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 489:119543c9f674 178 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 500 kHz - 563 kHz
mbed_official 174:8bb9f3a33240 179 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 489:119543c9f674 180 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1 MHz - 1.13 MHz
mbed_official 174:8bb9f3a33240 181 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 489:119543c9f674 182 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2 MHz - 2.25 MHz
mbed_official 174:8bb9f3a33240 183 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 489:119543c9f674 184 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 4 MHz - 4.5 MHz
mbed_official 174:8bb9f3a33240 185 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 489:119543c9f674 186 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 8 MHz - 9 MHz
mbed_official 174:8bb9f3a33240 187 } else if ((hz >= 16000000) && (hz < 32000000)) {
mbed_official 489:119543c9f674 188 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 16 MHz - 18 MHz
mbed_official 174:8bb9f3a33240 189 } else { // >= 32000000
mbed_official 489:119543c9f674 190 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 32 MHz - 36 MHz
mbed_official 139:e3413eddde57 191 }
mbed_official 139:e3413eddde57 192 }
mbed_official 174:8bb9f3a33240 193
mbed_official 139:e3413eddde57 194 if (obj->spi == SPI_2) {
mbed_official 139:e3413eddde57 195 // Values depend of PCLK1: 32 MHz if HSI is used, 36 MHz if HSE is used
mbed_official 139:e3413eddde57 196 if (hz < 250000) {
mbed_official 489:119543c9f674 197 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 125 kHz - 141 kHz
mbed_official 174:8bb9f3a33240 198 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 489:119543c9f674 199 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 250 kHz - 281 kHz
mbed_official 174:8bb9f3a33240 200 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 489:119543c9f674 201 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 500 kHz - 563 kHz
mbed_official 174:8bb9f3a33240 202 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 489:119543c9f674 203 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz - 1.13 MHz
mbed_official 174:8bb9f3a33240 204 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 489:119543c9f674 205 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2 MHz - 2.25 MHz
mbed_official 174:8bb9f3a33240 206 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 489:119543c9f674 207 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 4 MHz - 4.5 MHz
mbed_official 174:8bb9f3a33240 208 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 489:119543c9f674 209 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 8 MHz - 9 MHz
mbed_official 174:8bb9f3a33240 210 } else { // >= 16000000
mbed_official 489:119543c9f674 211 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 16 MHz - 18 MHz
mbed_official 139:e3413eddde57 212 }
mbed_official 139:e3413eddde57 213 }
mbed_official 52:a51c77007319 214
mbed_official 56:99eb381a3269 215 init_spi(obj);
mbed_official 52:a51c77007319 216 }
mbed_official 52:a51c77007319 217
mbed_official 402:09075a3b15e3 218 static inline int ssp_readable(spi_t *obj)
mbed_official 402:09075a3b15e3 219 {
mbed_official 52:a51c77007319 220 int status;
mbed_official 489:119543c9f674 221 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 222 // Check if data is received
mbed_official 489:119543c9f674 223 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 174:8bb9f3a33240 224 return status;
mbed_official 52:a51c77007319 225 }
mbed_official 52:a51c77007319 226
mbed_official 402:09075a3b15e3 227 static inline int ssp_writeable(spi_t *obj)
mbed_official 402:09075a3b15e3 228 {
mbed_official 52:a51c77007319 229 int status;
mbed_official 489:119543c9f674 230 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 231 // Check if data is transmitted
mbed_official 489:119543c9f674 232 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 52:a51c77007319 233 return status;
mbed_official 52:a51c77007319 234 }
mbed_official 52:a51c77007319 235
mbed_official 402:09075a3b15e3 236 static inline void ssp_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 237 {
mbed_official 174:8bb9f3a33240 238 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 239 while (!ssp_writeable(obj));
mbed_official 489:119543c9f674 240 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 489:119543c9f674 241 // Force 8-bit access to the data register
mbed_official 489:119543c9f674 242 uint8_t *p_spi_dr = 0;
mbed_official 489:119543c9f674 243 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 489:119543c9f674 244 *p_spi_dr = (uint8_t)value;
mbed_official 489:119543c9f674 245 } else { // SPI_DATASIZE_16BIT
mbed_official 489:119543c9f674 246 spi->DR = (uint16_t)value;
mbed_official 489:119543c9f674 247 }
mbed_official 52:a51c77007319 248 }
mbed_official 52:a51c77007319 249
mbed_official 402:09075a3b15e3 250 static inline int ssp_read(spi_t *obj)
mbed_official 402:09075a3b15e3 251 {
mbed_official 174:8bb9f3a33240 252 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 253 while (!ssp_readable(obj));
mbed_official 489:119543c9f674 254 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 489:119543c9f674 255 // Force 8-bit access to the data register
mbed_official 489:119543c9f674 256 uint8_t *p_spi_dr = 0;
mbed_official 489:119543c9f674 257 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 489:119543c9f674 258 return (int)(*p_spi_dr);
mbed_official 489:119543c9f674 259 } else {
mbed_official 489:119543c9f674 260 return (int)spi->DR;
mbed_official 489:119543c9f674 261 }
mbed_official 52:a51c77007319 262 }
mbed_official 52:a51c77007319 263
mbed_official 402:09075a3b15e3 264 static inline int ssp_busy(spi_t *obj)
mbed_official 402:09075a3b15e3 265 {
mbed_official 52:a51c77007319 266 int status;
mbed_official 489:119543c9f674 267 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 489:119543c9f674 268 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 52:a51c77007319 269 return status;
mbed_official 52:a51c77007319 270 }
mbed_official 52:a51c77007319 271
mbed_official 402:09075a3b15e3 272 int spi_master_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 273 {
mbed_official 52:a51c77007319 274 ssp_write(obj, value);
mbed_official 52:a51c77007319 275 return ssp_read(obj);
mbed_official 52:a51c77007319 276 }
mbed_official 52:a51c77007319 277
mbed_official 402:09075a3b15e3 278 int spi_slave_receive(spi_t *obj)
mbed_official 402:09075a3b15e3 279 {
mbed_official 233:1bbc1451db33 280 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 52:a51c77007319 281 };
mbed_official 52:a51c77007319 282
mbed_official 402:09075a3b15e3 283 int spi_slave_read(spi_t *obj)
mbed_official 402:09075a3b15e3 284 {
mbed_official 52:a51c77007319 285 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 489:119543c9f674 286 while (!ssp_readable(obj));
mbed_official 489:119543c9f674 287 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 489:119543c9f674 288 // Force 8-bit access to the data register
mbed_official 489:119543c9f674 289 uint8_t *p_spi_dr = 0;
mbed_official 489:119543c9f674 290 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 489:119543c9f674 291 return (int)(*p_spi_dr);
mbed_official 489:119543c9f674 292 } else {
mbed_official 489:119543c9f674 293 return (int)spi->DR;
mbed_official 489:119543c9f674 294 }
mbed_official 52:a51c77007319 295 }
mbed_official 52:a51c77007319 296
mbed_official 402:09075a3b15e3 297 void spi_slave_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 298 {
mbed_official 174:8bb9f3a33240 299 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 174:8bb9f3a33240 300 while (!ssp_writeable(obj));
mbed_official 489:119543c9f674 301 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 489:119543c9f674 302 // Force 8-bit access to the data register
mbed_official 489:119543c9f674 303 uint8_t *p_spi_dr = 0;
mbed_official 489:119543c9f674 304 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 489:119543c9f674 305 *p_spi_dr = (uint8_t)value;
mbed_official 489:119543c9f674 306 } else { // SPI_DATASIZE_16BIT
mbed_official 489:119543c9f674 307 spi->DR = (uint16_t)value;
mbed_official 489:119543c9f674 308 }
mbed_official 52:a51c77007319 309 }
mbed_official 52:a51c77007319 310
mbed_official 402:09075a3b15e3 311 int spi_busy(spi_t *obj)
mbed_official 402:09075a3b15e3 312 {
mbed_official 52:a51c77007319 313 return ssp_busy(obj);
mbed_official 52:a51c77007319 314 }
mbed_official 52:a51c77007319 315
mbed_official 52:a51c77007319 316 #endif