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targets/hal/TARGET_STM/TARGET_STM32L4/spi_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
144:ef7eb2e8f9f7
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 *******************************************************************************
bogdanm 0:9b334a45a8ff 3 * Copyright (c) 2015, STMicroelectronics
bogdanm 0:9b334a45a8ff 4 * All rights reserved.
bogdanm 0:9b334a45a8ff 5 *
bogdanm 0:9b334a45a8ff 6 * Redistribution and use in source and binary forms, with or without
bogdanm 0:9b334a45a8ff 7 * modification, are permitted provided that the following conditions are met:
bogdanm 0:9b334a45a8ff 8 *
bogdanm 0:9b334a45a8ff 9 * 1. Redistributions of source code must retain the above copyright notice,
bogdanm 0:9b334a45a8ff 10 * this list of conditions and the following disclaimer.
bogdanm 0:9b334a45a8ff 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
bogdanm 0:9b334a45a8ff 12 * this list of conditions and the following disclaimer in the documentation
bogdanm 0:9b334a45a8ff 13 * and/or other materials provided with the distribution.
bogdanm 0:9b334a45a8ff 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
bogdanm 0:9b334a45a8ff 15 * may be used to endorse or promote products derived from this software
bogdanm 0:9b334a45a8ff 16 * without specific prior written permission.
bogdanm 0:9b334a45a8ff 17 *
bogdanm 0:9b334a45a8ff 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
bogdanm 0:9b334a45a8ff 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
bogdanm 0:9b334a45a8ff 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
bogdanm 0:9b334a45a8ff 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
bogdanm 0:9b334a45a8ff 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
bogdanm 0:9b334a45a8ff 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
bogdanm 0:9b334a45a8ff 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
bogdanm 0:9b334a45a8ff 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
bogdanm 0:9b334a45a8ff 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
bogdanm 0:9b334a45a8ff 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
bogdanm 0:9b334a45a8ff 28 *******************************************************************************
bogdanm 0:9b334a45a8ff 29 */
bogdanm 0:9b334a45a8ff 30 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 31 #include "spi_api.h"
bogdanm 0:9b334a45a8ff 32
bogdanm 0:9b334a45a8ff 33 #if DEVICE_SPI
bogdanm 0:9b334a45a8ff 34
bogdanm 0:9b334a45a8ff 35 #include <math.h>
bogdanm 0:9b334a45a8ff 36 #include "cmsis.h"
bogdanm 0:9b334a45a8ff 37 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 38 #include "mbed_error.h"
bogdanm 0:9b334a45a8ff 39 #include "PeripheralPins.h"
bogdanm 0:9b334a45a8ff 40
bogdanm 0:9b334a45a8ff 41 static SPI_HandleTypeDef SpiHandle;
bogdanm 0:9b334a45a8ff 42
bogdanm 0:9b334a45a8ff 43 static void init_spi(spi_t *obj)
bogdanm 0:9b334a45a8ff 44 {
bogdanm 0:9b334a45a8ff 45 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 46
bogdanm 0:9b334a45a8ff 47 __HAL_SPI_DISABLE(&SpiHandle);
bogdanm 0:9b334a45a8ff 48
bogdanm 0:9b334a45a8ff 49 SpiHandle.Init.Mode = obj->mode;
bogdanm 0:9b334a45a8ff 50 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
bogdanm 0:9b334a45a8ff 51 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
bogdanm 0:9b334a45a8ff 52 SpiHandle.Init.CLKPhase = obj->cpha;
bogdanm 0:9b334a45a8ff 53 SpiHandle.Init.CLKPolarity = obj->cpol;
bogdanm 0:9b334a45a8ff 54 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
bogdanm 0:9b334a45a8ff 55 SpiHandle.Init.CRCPolynomial = 7;
bogdanm 0:9b334a45a8ff 56 SpiHandle.Init.CRCLength = SPI_CRC_LENGTH_8BIT;
bogdanm 0:9b334a45a8ff 57 SpiHandle.Init.DataSize = obj->bits;
bogdanm 0:9b334a45a8ff 58 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
bogdanm 0:9b334a45a8ff 59 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLE;
bogdanm 0:9b334a45a8ff 60 SpiHandle.Init.NSS = obj->nss;
bogdanm 0:9b334a45a8ff 61 SpiHandle.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
bogdanm 0:9b334a45a8ff 62
bogdanm 0:9b334a45a8ff 63 if (HAL_SPI_Init(&SpiHandle) != HAL_OK) {
bogdanm 0:9b334a45a8ff 64 error("Cannot initialize SPI\n");
bogdanm 0:9b334a45a8ff 65 }
bogdanm 0:9b334a45a8ff 66
bogdanm 0:9b334a45a8ff 67 __HAL_SPI_ENABLE(&SpiHandle);
bogdanm 0:9b334a45a8ff 68 }
bogdanm 0:9b334a45a8ff 69
bogdanm 0:9b334a45a8ff 70 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
bogdanm 0:9b334a45a8ff 71 {
bogdanm 0:9b334a45a8ff 72 // Determine the SPI to use
bogdanm 0:9b334a45a8ff 73 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
bogdanm 0:9b334a45a8ff 74 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
bogdanm 0:9b334a45a8ff 75 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
bogdanm 0:9b334a45a8ff 76 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
bogdanm 0:9b334a45a8ff 77
bogdanm 0:9b334a45a8ff 78 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
bogdanm 0:9b334a45a8ff 79 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
bogdanm 0:9b334a45a8ff 80
bogdanm 0:9b334a45a8ff 81 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
bogdanm 0:9b334a45a8ff 82 MBED_ASSERT(obj->spi != (SPIName)NC);
bogdanm 0:9b334a45a8ff 83
bogdanm 0:9b334a45a8ff 84 // Enable SPI clock
bogdanm 0:9b334a45a8ff 85 if (obj->spi == SPI_1) {
bogdanm 0:9b334a45a8ff 86 __HAL_RCC_SPI1_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 87 }
bogdanm 0:9b334a45a8ff 88 if (obj->spi == SPI_2) {
bogdanm 0:9b334a45a8ff 89 __HAL_RCC_SPI2_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 90 }
bogdanm 0:9b334a45a8ff 91 if (obj->spi == SPI_3) {
bogdanm 0:9b334a45a8ff 92 __HAL_RCC_SPI3_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 93 }
bogdanm 0:9b334a45a8ff 94
bogdanm 0:9b334a45a8ff 95 // Configure the SPI pins
bogdanm 0:9b334a45a8ff 96 pinmap_pinout(mosi, PinMap_SPI_MOSI);
bogdanm 0:9b334a45a8ff 97 pinmap_pinout(miso, PinMap_SPI_MISO);
bogdanm 0:9b334a45a8ff 98 pinmap_pinout(sclk, PinMap_SPI_SCLK);
bogdanm 0:9b334a45a8ff 99
bogdanm 0:9b334a45a8ff 100 // Save new values
bogdanm 0:9b334a45a8ff 101 obj->bits = SPI_DATASIZE_8BIT;
bogdanm 0:9b334a45a8ff 102 obj->cpol = SPI_POLARITY_LOW;
bogdanm 0:9b334a45a8ff 103 obj->cpha = SPI_PHASE_1EDGE;
bogdanm 0:9b334a45a8ff 104 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
bogdanm 0:9b334a45a8ff 105
bogdanm 0:9b334a45a8ff 106 obj->pin_miso = miso;
bogdanm 0:9b334a45a8ff 107 obj->pin_mosi = mosi;
bogdanm 0:9b334a45a8ff 108 obj->pin_sclk = sclk;
bogdanm 0:9b334a45a8ff 109 obj->pin_ssel = ssel;
bogdanm 0:9b334a45a8ff 110
bogdanm 0:9b334a45a8ff 111 if (ssel == NC) { // SW NSS Master mode
bogdanm 0:9b334a45a8ff 112 obj->mode = SPI_MODE_MASTER;
bogdanm 0:9b334a45a8ff 113 obj->nss = SPI_NSS_SOFT;
bogdanm 0:9b334a45a8ff 114 } else { // Slave
bogdanm 0:9b334a45a8ff 115 pinmap_pinout(ssel, PinMap_SPI_SSEL);
bogdanm 0:9b334a45a8ff 116 obj->mode = SPI_MODE_SLAVE;
bogdanm 0:9b334a45a8ff 117 obj->nss = SPI_NSS_HARD_INPUT;
bogdanm 0:9b334a45a8ff 118 }
bogdanm 0:9b334a45a8ff 119
bogdanm 0:9b334a45a8ff 120 init_spi(obj);
bogdanm 0:9b334a45a8ff 121 }
bogdanm 0:9b334a45a8ff 122
bogdanm 0:9b334a45a8ff 123 void spi_free(spi_t *obj)
bogdanm 0:9b334a45a8ff 124 {
bogdanm 0:9b334a45a8ff 125 // Reset SPI and disable clock
bogdanm 0:9b334a45a8ff 126 if (obj->spi == SPI_1) {
bogdanm 0:9b334a45a8ff 127 __HAL_RCC_SPI1_FORCE_RESET();
bogdanm 0:9b334a45a8ff 128 __HAL_RCC_SPI1_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 129 __HAL_RCC_SPI1_CLK_DISABLE();
bogdanm 0:9b334a45a8ff 130 }
bogdanm 0:9b334a45a8ff 131
bogdanm 0:9b334a45a8ff 132 if (obj->spi == SPI_2) {
bogdanm 0:9b334a45a8ff 133 __HAL_RCC_SPI2_FORCE_RESET();
bogdanm 0:9b334a45a8ff 134 __HAL_RCC_SPI2_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 135 __HAL_RCC_SPI2_CLK_DISABLE();
bogdanm 0:9b334a45a8ff 136 }
bogdanm 0:9b334a45a8ff 137
bogdanm 0:9b334a45a8ff 138 if (obj->spi == SPI_3) {
bogdanm 0:9b334a45a8ff 139 __HAL_RCC_SPI3_FORCE_RESET();
bogdanm 0:9b334a45a8ff 140 __HAL_RCC_SPI3_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 141 __HAL_RCC_SPI3_CLK_DISABLE();
bogdanm 0:9b334a45a8ff 142 }
bogdanm 0:9b334a45a8ff 143
bogdanm 0:9b334a45a8ff 144 // Configure GPIO
bogdanm 0:9b334a45a8ff 145 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
bogdanm 0:9b334a45a8ff 146 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
bogdanm 0:9b334a45a8ff 147 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
bogdanm 0:9b334a45a8ff 148 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
bogdanm 0:9b334a45a8ff 149 }
bogdanm 0:9b334a45a8ff 150
bogdanm 0:9b334a45a8ff 151 void spi_format(spi_t *obj, int bits, int mode, int slave)
bogdanm 0:9b334a45a8ff 152 {
bogdanm 0:9b334a45a8ff 153 // Save new values
bogdanm 0:9b334a45a8ff 154 if (bits == 16) {
bogdanm 0:9b334a45a8ff 155 obj->bits = SPI_DATASIZE_16BIT;
bogdanm 0:9b334a45a8ff 156 } else {
bogdanm 0:9b334a45a8ff 157 obj->bits = SPI_DATASIZE_8BIT;
bogdanm 0:9b334a45a8ff 158 }
bogdanm 0:9b334a45a8ff 159
bogdanm 0:9b334a45a8ff 160 switch (mode) {
bogdanm 0:9b334a45a8ff 161 case 0:
bogdanm 0:9b334a45a8ff 162 obj->cpol = SPI_POLARITY_LOW;
bogdanm 0:9b334a45a8ff 163 obj->cpha = SPI_PHASE_1EDGE;
bogdanm 0:9b334a45a8ff 164 break;
bogdanm 0:9b334a45a8ff 165 case 1:
bogdanm 0:9b334a45a8ff 166 obj->cpol = SPI_POLARITY_LOW;
bogdanm 0:9b334a45a8ff 167 obj->cpha = SPI_PHASE_2EDGE;
bogdanm 0:9b334a45a8ff 168 break;
bogdanm 0:9b334a45a8ff 169 case 2:
bogdanm 0:9b334a45a8ff 170 obj->cpol = SPI_POLARITY_HIGH;
bogdanm 0:9b334a45a8ff 171 obj->cpha = SPI_PHASE_1EDGE;
bogdanm 0:9b334a45a8ff 172 break;
bogdanm 0:9b334a45a8ff 173 default:
bogdanm 0:9b334a45a8ff 174 obj->cpol = SPI_POLARITY_HIGH;
bogdanm 0:9b334a45a8ff 175 obj->cpha = SPI_PHASE_2EDGE;
bogdanm 0:9b334a45a8ff 176 break;
bogdanm 0:9b334a45a8ff 177 }
bogdanm 0:9b334a45a8ff 178
bogdanm 0:9b334a45a8ff 179 if (slave == 0) {
bogdanm 0:9b334a45a8ff 180 obj->mode = SPI_MODE_MASTER;
bogdanm 0:9b334a45a8ff 181 obj->nss = SPI_NSS_SOFT;
bogdanm 0:9b334a45a8ff 182 } else {
bogdanm 0:9b334a45a8ff 183 obj->mode = SPI_MODE_SLAVE;
bogdanm 0:9b334a45a8ff 184 obj->nss = SPI_NSS_HARD_INPUT;
bogdanm 0:9b334a45a8ff 185 }
bogdanm 0:9b334a45a8ff 186
bogdanm 0:9b334a45a8ff 187 init_spi(obj);
bogdanm 0:9b334a45a8ff 188 }
bogdanm 0:9b334a45a8ff 189
bogdanm 0:9b334a45a8ff 190 void spi_frequency(spi_t *obj, int hz)
bogdanm 0:9b334a45a8ff 191 {
bogdanm 0:9b334a45a8ff 192 // Values depend of PCLK1 and PCLK2: 80 MHz if MSI or HSI is used, 48 MHz if HSE is used
bogdanm 0:9b334a45a8ff 193 if (SystemCoreClock == 80000000) { // MSI or HSI
bogdanm 0:9b334a45a8ff 194 if (hz < 600000) {
bogdanm 0:9b334a45a8ff 195 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 313 kHz
bogdanm 0:9b334a45a8ff 196 } else if ((hz >= 600000) && (hz < 1000000)) {
bogdanm 0:9b334a45a8ff 197 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 625 kHz
bogdanm 0:9b334a45a8ff 198 } else if ((hz >= 1000000) && (hz < 2000000)) {
bogdanm 0:9b334a45a8ff 199 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.25 MHz (default)
bogdanm 0:9b334a45a8ff 200 } else if ((hz >= 2000000) && (hz < 5000000)) {
bogdanm 0:9b334a45a8ff 201 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2.5 MHz
bogdanm 0:9b334a45a8ff 202 } else if ((hz >= 5000000) && (hz < 10000000)) {
bogdanm 0:9b334a45a8ff 203 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 5 MHz
bogdanm 0:9b334a45a8ff 204 } else if ((hz >= 10000000) && (hz < 20000000)) {
bogdanm 0:9b334a45a8ff 205 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 10 MHz
bogdanm 0:9b334a45a8ff 206 } else if ((hz >= 20000000) && (hz < 40000000)) {
bogdanm 0:9b334a45a8ff 207 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 20 MHz
bogdanm 0:9b334a45a8ff 208 } else { // >= 40000000
bogdanm 0:9b334a45a8ff 209 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 40 MHz
bogdanm 0:9b334a45a8ff 210 }
bogdanm 0:9b334a45a8ff 211 } else { // 48 MHz - HSE
bogdanm 0:9b334a45a8ff 212 if (hz < 350000) {
bogdanm 0:9b334a45a8ff 213 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 188 kHz
bogdanm 0:9b334a45a8ff 214 } else if ((hz >= 350000) && (hz < 750000)) {
bogdanm 0:9b334a45a8ff 215 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
bogdanm 0:9b334a45a8ff 216 } else if ((hz >= 750000) && (hz < 1000000)) {
bogdanm 0:9b334a45a8ff 217 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 750 kHz
bogdanm 0:9b334a45a8ff 218 } else if ((hz >= 1000000) && (hz < 3000000)) {
bogdanm 0:9b334a45a8ff 219 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz (default)
bogdanm 0:9b334a45a8ff 220 } else if ((hz >= 3000000) && (hz < 6000000)) {
bogdanm 0:9b334a45a8ff 221 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
bogdanm 0:9b334a45a8ff 222 } else if ((hz >= 6000000) && (hz < 12000000)) {
bogdanm 0:9b334a45a8ff 223 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
bogdanm 0:9b334a45a8ff 224 } else if ((hz >= 12000000) && (hz < 24000000)) {
bogdanm 0:9b334a45a8ff 225 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
bogdanm 0:9b334a45a8ff 226 } else { // >= 24000000
bogdanm 0:9b334a45a8ff 227 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
bogdanm 0:9b334a45a8ff 228 }
bogdanm 0:9b334a45a8ff 229 }
bogdanm 0:9b334a45a8ff 230
bogdanm 0:9b334a45a8ff 231 init_spi(obj);
bogdanm 0:9b334a45a8ff 232 }
bogdanm 0:9b334a45a8ff 233
bogdanm 0:9b334a45a8ff 234 static inline int ssp_readable(spi_t *obj)
bogdanm 0:9b334a45a8ff 235 {
bogdanm 0:9b334a45a8ff 236 int status;
bogdanm 0:9b334a45a8ff 237 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 238 // Check if data is received
bogdanm 0:9b334a45a8ff 239 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
bogdanm 0:9b334a45a8ff 240 return status;
bogdanm 0:9b334a45a8ff 241 }
bogdanm 0:9b334a45a8ff 242
bogdanm 0:9b334a45a8ff 243 static inline int ssp_writeable(spi_t *obj)
bogdanm 0:9b334a45a8ff 244 {
bogdanm 0:9b334a45a8ff 245 int status;
bogdanm 0:9b334a45a8ff 246 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 247 // Check if data is transmitted
bogdanm 0:9b334a45a8ff 248 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
bogdanm 0:9b334a45a8ff 249 return status;
bogdanm 0:9b334a45a8ff 250 }
bogdanm 0:9b334a45a8ff 251
bogdanm 0:9b334a45a8ff 252 static inline void ssp_write(spi_t *obj, int value)
bogdanm 0:9b334a45a8ff 253 {
bogdanm 0:9b334a45a8ff 254 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 255 while (!ssp_writeable(obj));
bogdanm 0:9b334a45a8ff 256 //spi->DR = (uint16_t)value;
bogdanm 0:9b334a45a8ff 257 if (obj->bits == SPI_DATASIZE_8BIT) {
bogdanm 0:9b334a45a8ff 258 // Force 8-bit access to the data register
bogdanm 0:9b334a45a8ff 259 uint8_t *p_spi_dr = 0;
bogdanm 0:9b334a45a8ff 260 p_spi_dr = (uint8_t *) & (spi->DR);
bogdanm 0:9b334a45a8ff 261 *p_spi_dr = (uint8_t)value;
bogdanm 0:9b334a45a8ff 262 } else { // SPI_DATASIZE_16BIT
bogdanm 0:9b334a45a8ff 263 spi->DR = (uint16_t)value;
bogdanm 0:9b334a45a8ff 264 }
bogdanm 0:9b334a45a8ff 265 }
bogdanm 0:9b334a45a8ff 266
bogdanm 0:9b334a45a8ff 267 static inline int ssp_read(spi_t *obj)
bogdanm 0:9b334a45a8ff 268 {
bogdanm 0:9b334a45a8ff 269 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 270 while (!ssp_readable(obj));
bogdanm 0:9b334a45a8ff 271 //return (int)spi->DR;
bogdanm 0:9b334a45a8ff 272 if (obj->bits == SPI_DATASIZE_8BIT) {
bogdanm 0:9b334a45a8ff 273 // Force 8-bit access to the data register
bogdanm 0:9b334a45a8ff 274 uint8_t *p_spi_dr = 0;
bogdanm 0:9b334a45a8ff 275 p_spi_dr = (uint8_t *) & (spi->DR);
bogdanm 0:9b334a45a8ff 276 return (int)(*p_spi_dr);
bogdanm 0:9b334a45a8ff 277 } else {
bogdanm 0:9b334a45a8ff 278 return (int)spi->DR;
bogdanm 0:9b334a45a8ff 279 }
bogdanm 0:9b334a45a8ff 280 }
bogdanm 0:9b334a45a8ff 281
bogdanm 0:9b334a45a8ff 282 static inline int ssp_busy(spi_t *obj)
bogdanm 0:9b334a45a8ff 283 {
bogdanm 0:9b334a45a8ff 284 int status;
bogdanm 0:9b334a45a8ff 285 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 286 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
bogdanm 0:9b334a45a8ff 287 return status;
bogdanm 0:9b334a45a8ff 288 }
bogdanm 0:9b334a45a8ff 289
bogdanm 0:9b334a45a8ff 290 int spi_master_write(spi_t *obj, int value)
bogdanm 0:9b334a45a8ff 291 {
bogdanm 0:9b334a45a8ff 292 ssp_write(obj, value);
bogdanm 0:9b334a45a8ff 293 return ssp_read(obj);
bogdanm 0:9b334a45a8ff 294 }
bogdanm 0:9b334a45a8ff 295
bogdanm 0:9b334a45a8ff 296 int spi_slave_receive(spi_t *obj)
bogdanm 0:9b334a45a8ff 297 {
bogdanm 0:9b334a45a8ff 298 return (ssp_readable(obj) ? 1 : 0);
bogdanm 0:9b334a45a8ff 299 };
bogdanm 0:9b334a45a8ff 300
bogdanm 0:9b334a45a8ff 301 int spi_slave_read(spi_t *obj)
bogdanm 0:9b334a45a8ff 302 {
bogdanm 0:9b334a45a8ff 303 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 304 while (!ssp_readable(obj));
bogdanm 0:9b334a45a8ff 305 //return (int)spi->DR;
bogdanm 0:9b334a45a8ff 306 if (obj->bits == SPI_DATASIZE_8BIT) {
bogdanm 0:9b334a45a8ff 307 // Force 8-bit access to the data register
bogdanm 0:9b334a45a8ff 308 uint8_t *p_spi_dr = 0;
bogdanm 0:9b334a45a8ff 309 p_spi_dr = (uint8_t *) & (spi->DR);
bogdanm 0:9b334a45a8ff 310 return (int)(*p_spi_dr);
bogdanm 0:9b334a45a8ff 311 } else {
bogdanm 0:9b334a45a8ff 312 return (int)spi->DR;
bogdanm 0:9b334a45a8ff 313 }
bogdanm 0:9b334a45a8ff 314 }
bogdanm 0:9b334a45a8ff 315
bogdanm 0:9b334a45a8ff 316 void spi_slave_write(spi_t *obj, int value)
bogdanm 0:9b334a45a8ff 317 {
bogdanm 0:9b334a45a8ff 318 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 319 while (!ssp_writeable(obj));
bogdanm 0:9b334a45a8ff 320 //spi->DR = (uint16_t)value;
bogdanm 0:9b334a45a8ff 321 if (obj->bits == SPI_DATASIZE_8BIT) {
bogdanm 0:9b334a45a8ff 322 // Force 8-bit access to the data register
bogdanm 0:9b334a45a8ff 323 uint8_t *p_spi_dr = 0;
bogdanm 0:9b334a45a8ff 324 p_spi_dr = (uint8_t *) & (spi->DR);
bogdanm 0:9b334a45a8ff 325 *p_spi_dr = (uint8_t)value;
bogdanm 0:9b334a45a8ff 326 } else { // SPI_DATASIZE_16BIT
bogdanm 0:9b334a45a8ff 327 spi->DR = (uint16_t)value;
bogdanm 0:9b334a45a8ff 328 }
bogdanm 0:9b334a45a8ff 329 }
bogdanm 0:9b334a45a8ff 330
bogdanm 0:9b334a45a8ff 331 int spi_busy(spi_t *obj)
bogdanm 0:9b334a45a8ff 332 {
bogdanm 0:9b334a45a8ff 333 return ssp_busy(obj);
bogdanm 0:9b334a45a8ff 334 }
bogdanm 0:9b334a45a8ff 335
bogdanm 0:9b334a45a8ff 336 #endif