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targets/hal/TARGET_STM/TARGET_STM32F7/spi_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
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 "PeripheralPins.h"
bogdanm 0:9b334a45a8ff 39 #include "mbed_error.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_DISABLED;
bogdanm 0:9b334a45a8ff 55 SpiHandle.Init.CRCPolynomial = 7;
bogdanm 0:9b334a45a8ff 56 SpiHandle.Init.DataSize = obj->bits;
bogdanm 0:9b334a45a8ff 57 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
bogdanm 0:9b334a45a8ff 58 SpiHandle.Init.NSS = obj->nss;
bogdanm 0:9b334a45a8ff 59 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
bogdanm 0:9b334a45a8ff 60
bogdanm 0:9b334a45a8ff 61 if (HAL_SPI_Init(&SpiHandle) != HAL_OK) {
bogdanm 0:9b334a45a8ff 62 error("Cannot initialize SPI");
bogdanm 0:9b334a45a8ff 63 }
bogdanm 0:9b334a45a8ff 64
bogdanm 0:9b334a45a8ff 65 __HAL_SPI_ENABLE(&SpiHandle);
bogdanm 0:9b334a45a8ff 66 }
bogdanm 0:9b334a45a8ff 67
bogdanm 0:9b334a45a8ff 68 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
bogdanm 0:9b334a45a8ff 69 {
bogdanm 0:9b334a45a8ff 70 // Determine the SPI to use
bogdanm 0:9b334a45a8ff 71 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
bogdanm 0:9b334a45a8ff 72 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
bogdanm 0:9b334a45a8ff 73 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
bogdanm 0:9b334a45a8ff 74 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
bogdanm 0:9b334a45a8ff 75
bogdanm 0:9b334a45a8ff 76 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
bogdanm 0:9b334a45a8ff 77 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
bogdanm 0:9b334a45a8ff 78
bogdanm 0:9b334a45a8ff 79 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
bogdanm 0:9b334a45a8ff 80 MBED_ASSERT(obj->spi != (SPIName)NC);
bogdanm 0:9b334a45a8ff 81
bogdanm 0:9b334a45a8ff 82 // Enable SPI clock
bogdanm 0:9b334a45a8ff 83 if (obj->spi == SPI_2) {
bogdanm 0:9b334a45a8ff 84 __HAL_RCC_SPI2_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 85 }
bogdanm 0:9b334a45a8ff 86
bogdanm 0:9b334a45a8ff 87 if (obj->spi == SPI_5) {
bogdanm 0:9b334a45a8ff 88 __HAL_RCC_SPI5_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 89 }
bogdanm 0:9b334a45a8ff 90
bogdanm 0:9b334a45a8ff 91 // Configure the SPI pins
bogdanm 0:9b334a45a8ff 92 pinmap_pinout(mosi, PinMap_SPI_MOSI);
bogdanm 0:9b334a45a8ff 93 pinmap_pinout(miso, PinMap_SPI_MISO);
bogdanm 0:9b334a45a8ff 94 pinmap_pinout(sclk, PinMap_SPI_SCLK);
bogdanm 0:9b334a45a8ff 95
bogdanm 0:9b334a45a8ff 96 // Save new values
bogdanm 0:9b334a45a8ff 97 obj->bits = SPI_DATASIZE_8BIT;
bogdanm 0:9b334a45a8ff 98 obj->cpol = SPI_POLARITY_LOW;
bogdanm 0:9b334a45a8ff 99 obj->cpha = SPI_PHASE_1EDGE;
bogdanm 0:9b334a45a8ff 100 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
bogdanm 0:9b334a45a8ff 101
bogdanm 0:9b334a45a8ff 102 obj->pin_miso = miso;
bogdanm 0:9b334a45a8ff 103 obj->pin_mosi = mosi;
bogdanm 0:9b334a45a8ff 104 obj->pin_sclk = sclk;
bogdanm 0:9b334a45a8ff 105 obj->pin_ssel = ssel;
bogdanm 0:9b334a45a8ff 106
bogdanm 0:9b334a45a8ff 107 if (ssel != NC) {
bogdanm 0:9b334a45a8ff 108 pinmap_pinout(ssel, PinMap_SPI_SSEL);
bogdanm 0:9b334a45a8ff 109 } else {
bogdanm 0:9b334a45a8ff 110 obj->nss = SPI_NSS_SOFT;
bogdanm 0:9b334a45a8ff 111 }
bogdanm 0:9b334a45a8ff 112
bogdanm 0:9b334a45a8ff 113 init_spi(obj);
bogdanm 0:9b334a45a8ff 114 }
bogdanm 0:9b334a45a8ff 115
bogdanm 0:9b334a45a8ff 116 void spi_free(spi_t *obj)
bogdanm 0:9b334a45a8ff 117 {
bogdanm 0:9b334a45a8ff 118 // Reset SPI and disable clock
bogdanm 0:9b334a45a8ff 119 if (obj->spi == SPI_2) {
bogdanm 0:9b334a45a8ff 120 __HAL_RCC_SPI2_FORCE_RESET();
bogdanm 0:9b334a45a8ff 121 __HAL_RCC_SPI2_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 122 __HAL_RCC_SPI2_CLK_DISABLE();
bogdanm 0:9b334a45a8ff 123 }
bogdanm 0:9b334a45a8ff 124
bogdanm 0:9b334a45a8ff 125 if (obj->spi == SPI_5) {
bogdanm 0:9b334a45a8ff 126 __HAL_RCC_SPI5_FORCE_RESET();
bogdanm 0:9b334a45a8ff 127 __HAL_RCC_SPI5_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 128 __HAL_RCC_SPI5_CLK_DISABLE();
bogdanm 0:9b334a45a8ff 129 }
bogdanm 0:9b334a45a8ff 130
bogdanm 0:9b334a45a8ff 131 // Configure GPIOs
bogdanm 0:9b334a45a8ff 132 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
bogdanm 0:9b334a45a8ff 133 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
bogdanm 0:9b334a45a8ff 134 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
bogdanm 0:9b334a45a8ff 135 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
bogdanm 0:9b334a45a8ff 136 }
bogdanm 0:9b334a45a8ff 137
bogdanm 0:9b334a45a8ff 138 void spi_format(spi_t *obj, int bits, int mode, int slave)
bogdanm 0:9b334a45a8ff 139 {
bogdanm 0:9b334a45a8ff 140 // Save new values
bogdanm 0:9b334a45a8ff 141 if (bits == 16) {
bogdanm 0:9b334a45a8ff 142 obj->bits = SPI_DATASIZE_16BIT;
bogdanm 0:9b334a45a8ff 143 } else {
bogdanm 0:9b334a45a8ff 144 obj->bits = SPI_DATASIZE_8BIT;
bogdanm 0:9b334a45a8ff 145 }
bogdanm 0:9b334a45a8ff 146
bogdanm 0:9b334a45a8ff 147 switch (mode) {
bogdanm 0:9b334a45a8ff 148 case 0:
bogdanm 0:9b334a45a8ff 149 obj->cpol = SPI_POLARITY_LOW;
bogdanm 0:9b334a45a8ff 150 obj->cpha = SPI_PHASE_1EDGE;
bogdanm 0:9b334a45a8ff 151 break;
bogdanm 0:9b334a45a8ff 152 case 1:
bogdanm 0:9b334a45a8ff 153 obj->cpol = SPI_POLARITY_LOW;
bogdanm 0:9b334a45a8ff 154 obj->cpha = SPI_PHASE_2EDGE;
bogdanm 0:9b334a45a8ff 155 break;
bogdanm 0:9b334a45a8ff 156 case 2:
bogdanm 0:9b334a45a8ff 157 obj->cpol = SPI_POLARITY_HIGH;
bogdanm 0:9b334a45a8ff 158 obj->cpha = SPI_PHASE_1EDGE;
bogdanm 0:9b334a45a8ff 159 break;
bogdanm 0:9b334a45a8ff 160 default:
bogdanm 0:9b334a45a8ff 161 obj->cpol = SPI_POLARITY_HIGH;
bogdanm 0:9b334a45a8ff 162 obj->cpha = SPI_PHASE_2EDGE;
bogdanm 0:9b334a45a8ff 163 break;
bogdanm 0:9b334a45a8ff 164 }
bogdanm 0:9b334a45a8ff 165
bogdanm 0:9b334a45a8ff 166 if (obj->nss != SPI_NSS_SOFT) {
bogdanm 0:9b334a45a8ff 167 obj->nss = (slave) ? SPI_NSS_HARD_INPUT : SPI_NSS_HARD_OUTPUT;
bogdanm 0:9b334a45a8ff 168 }
bogdanm 0:9b334a45a8ff 169
bogdanm 0:9b334a45a8ff 170 obj->mode = (slave) ? SPI_MODE_SLAVE : SPI_MODE_MASTER;
bogdanm 0:9b334a45a8ff 171
bogdanm 0:9b334a45a8ff 172 init_spi(obj);
bogdanm 0:9b334a45a8ff 173 }
bogdanm 0:9b334a45a8ff 174
bogdanm 0:9b334a45a8ff 175 void spi_frequency(spi_t *obj, int hz)
bogdanm 0:9b334a45a8ff 176 {
bogdanm 0:9b334a45a8ff 177 // The frequencies are obtained with:
bogdanm 0:9b334a45a8ff 178 // - SPI2 clock = 54 MHz (APB1 clock)
bogdanm 0:9b334a45a8ff 179 // - SPI5 clock = 108 MHz (APB2 clock)
bogdanm 0:9b334a45a8ff 180 if (obj->spi == SPI_2) {
bogdanm 0:9b334a45a8ff 181 if (hz < 400000) {
bogdanm 0:9b334a45a8ff 182 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 211 kHz
bogdanm 0:9b334a45a8ff 183 } else if ((hz >= 400000) && (hz < 800000)) {
bogdanm 0:9b334a45a8ff 184 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 422 kHz
bogdanm 0:9b334a45a8ff 185 } else if ((hz >= 800000) && (hz < 1000000)) {
bogdanm 0:9b334a45a8ff 186 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 844 kHz
bogdanm 0:9b334a45a8ff 187 } else if ((hz >= 1000000) && (hz < 3000000)) {
bogdanm 0:9b334a45a8ff 188 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.69 MHz
bogdanm 0:9b334a45a8ff 189 } else if ((hz >= 3000000) && (hz < 6000000)) {
bogdanm 0:9b334a45a8ff 190 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3.38 MHz
bogdanm 0:9b334a45a8ff 191 } else if ((hz >= 6000000) && (hz < 12000000)) {
bogdanm 0:9b334a45a8ff 192 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6.75 MHz
bogdanm 0:9b334a45a8ff 193 } else if ((hz >= 12000000) && (hz < 24000000)) {
bogdanm 0:9b334a45a8ff 194 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 13.5 MHz
bogdanm 0:9b334a45a8ff 195 } else { // >= 24000000
bogdanm 0:9b334a45a8ff 196 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 27 MHz
bogdanm 0:9b334a45a8ff 197 }
bogdanm 0:9b334a45a8ff 198 } else if (obj->spi == SPI_5) {
bogdanm 0:9b334a45a8ff 199 if (hz < 800000) {
bogdanm 0:9b334a45a8ff 200 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 422 kHz
bogdanm 0:9b334a45a8ff 201 } else if ((hz >= 800000) && (hz < 1000000)) {
bogdanm 0:9b334a45a8ff 202 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 844 kHz
bogdanm 0:9b334a45a8ff 203 } else if ((hz >= 1000000) && (hz < 3000000)) {
bogdanm 0:9b334a45a8ff 204 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.69 MHz
bogdanm 0:9b334a45a8ff 205 } else if ((hz >= 3000000) && (hz < 6000000)) {
bogdanm 0:9b334a45a8ff 206 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 3.38 MHz
bogdanm 0:9b334a45a8ff 207 } else if ((hz >= 6000000) && (hz < 12000000)) {
bogdanm 0:9b334a45a8ff 208 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 6.75 MHz
bogdanm 0:9b334a45a8ff 209 } else if ((hz >= 12000000) && (hz < 24000000)) {
bogdanm 0:9b334a45a8ff 210 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 13.5 MHz
bogdanm 0:9b334a45a8ff 211 } else if ((hz >= 24000000) && (hz < 54000000)) {
bogdanm 0:9b334a45a8ff 212 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 27 MHz
bogdanm 0:9b334a45a8ff 213 } else { // >= 54000000
bogdanm 0:9b334a45a8ff 214 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 54 MHz
bogdanm 0:9b334a45a8ff 215 }
bogdanm 0:9b334a45a8ff 216 } else {
bogdanm 0:9b334a45a8ff 217 return;
bogdanm 0:9b334a45a8ff 218 }
bogdanm 0:9b334a45a8ff 219 init_spi(obj);
bogdanm 0:9b334a45a8ff 220 }
bogdanm 0:9b334a45a8ff 221
bogdanm 0:9b334a45a8ff 222 static inline int ssp_readable(spi_t *obj)
bogdanm 0:9b334a45a8ff 223 {
bogdanm 0:9b334a45a8ff 224 int status;
bogdanm 0:9b334a45a8ff 225 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 226 // Check if data is received
bogdanm 0:9b334a45a8ff 227 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
bogdanm 0:9b334a45a8ff 228 return status;
bogdanm 0:9b334a45a8ff 229 }
bogdanm 0:9b334a45a8ff 230
bogdanm 0:9b334a45a8ff 231 static inline int ssp_writeable(spi_t *obj)
bogdanm 0:9b334a45a8ff 232 {
bogdanm 0:9b334a45a8ff 233 int status;
bogdanm 0:9b334a45a8ff 234 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 235 // Check if data is transmitted
bogdanm 0:9b334a45a8ff 236 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
bogdanm 0:9b334a45a8ff 237 return status;
bogdanm 0:9b334a45a8ff 238 }
bogdanm 0:9b334a45a8ff 239
bogdanm 0:9b334a45a8ff 240 static inline void ssp_write(spi_t *obj, int value)
bogdanm 0:9b334a45a8ff 241 {
bogdanm 0:9b334a45a8ff 242 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 243 while (!ssp_writeable(obj));
bogdanm 0:9b334a45a8ff 244 if (obj->bits == SPI_DATASIZE_8BIT) {
bogdanm 0:9b334a45a8ff 245 // Force 8-bit access to the data register
bogdanm 0:9b334a45a8ff 246 uint8_t *p_spi_dr = 0;
bogdanm 0:9b334a45a8ff 247 p_spi_dr = (uint8_t *) & (spi->DR);
bogdanm 0:9b334a45a8ff 248 *p_spi_dr = (uint8_t)value;
bogdanm 0:9b334a45a8ff 249 } else { // SPI_DATASIZE_16BIT
bogdanm 0:9b334a45a8ff 250 spi->DR = (uint16_t)value;
bogdanm 0:9b334a45a8ff 251 }
bogdanm 0:9b334a45a8ff 252 }
bogdanm 0:9b334a45a8ff 253
bogdanm 0:9b334a45a8ff 254 static inline int ssp_read(spi_t *obj)
bogdanm 0:9b334a45a8ff 255 {
bogdanm 0:9b334a45a8ff 256 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 257 while (!ssp_readable(obj));
bogdanm 0:9b334a45a8ff 258 if (obj->bits == SPI_DATASIZE_8BIT) {
bogdanm 0:9b334a45a8ff 259 // Force 8-bit access to the data register
bogdanm 0:9b334a45a8ff 260 uint8_t *p_spi_dr = 0;
bogdanm 0:9b334a45a8ff 261 p_spi_dr = (uint8_t *) & (spi->DR);
bogdanm 0:9b334a45a8ff 262 return (int)(*p_spi_dr);
bogdanm 0:9b334a45a8ff 263 } else {
bogdanm 0:9b334a45a8ff 264 return (int)spi->DR;
bogdanm 0:9b334a45a8ff 265 }
bogdanm 0:9b334a45a8ff 266 }
bogdanm 0:9b334a45a8ff 267
bogdanm 0:9b334a45a8ff 268 static inline int ssp_busy(spi_t *obj)
bogdanm 0:9b334a45a8ff 269 {
bogdanm 0:9b334a45a8ff 270 int status;
bogdanm 0:9b334a45a8ff 271 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 272 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
bogdanm 0:9b334a45a8ff 273 return status;
bogdanm 0:9b334a45a8ff 274 }
bogdanm 0:9b334a45a8ff 275
bogdanm 0:9b334a45a8ff 276 int spi_master_write(spi_t *obj, int value)
bogdanm 0:9b334a45a8ff 277 {
bogdanm 0:9b334a45a8ff 278 ssp_write(obj, value);
bogdanm 0:9b334a45a8ff 279 return ssp_read(obj);
bogdanm 0:9b334a45a8ff 280 }
bogdanm 0:9b334a45a8ff 281
bogdanm 0:9b334a45a8ff 282 int spi_slave_receive(spi_t *obj)
bogdanm 0:9b334a45a8ff 283 {
bogdanm 0:9b334a45a8ff 284 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
bogdanm 0:9b334a45a8ff 285 };
bogdanm 0:9b334a45a8ff 286
bogdanm 0:9b334a45a8ff 287 int spi_slave_read(spi_t *obj)
bogdanm 0:9b334a45a8ff 288 {
bogdanm 0:9b334a45a8ff 289 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 290 while (!ssp_readable(obj));
bogdanm 0:9b334a45a8ff 291 if (obj->bits == SPI_DATASIZE_8BIT) {
bogdanm 0:9b334a45a8ff 292 // Force 8-bit access to the data register
bogdanm 0:9b334a45a8ff 293 uint8_t *p_spi_dr = 0;
bogdanm 0:9b334a45a8ff 294 p_spi_dr = (uint8_t *) & (spi->DR);
bogdanm 0:9b334a45a8ff 295 return (int)(*p_spi_dr);
bogdanm 0:9b334a45a8ff 296 } else {
bogdanm 0:9b334a45a8ff 297 return (int)spi->DR;
bogdanm 0:9b334a45a8ff 298 }
bogdanm 0:9b334a45a8ff 299 }
bogdanm 0:9b334a45a8ff 300
bogdanm 0:9b334a45a8ff 301 void spi_slave_write(spi_t *obj, int value)
bogdanm 0:9b334a45a8ff 302 {
bogdanm 0:9b334a45a8ff 303 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 304 while (!ssp_writeable(obj));
bogdanm 0:9b334a45a8ff 305 if (obj->bits == SPI_DATASIZE_8BIT) {
bogdanm 0:9b334a45a8ff 306 // Force 8-bit access to the data register
bogdanm 0:9b334a45a8ff 307 uint8_t *p_spi_dr = 0;
bogdanm 0:9b334a45a8ff 308 p_spi_dr = (uint8_t *) & (spi->DR);
bogdanm 0:9b334a45a8ff 309 *p_spi_dr = (uint8_t)value;
bogdanm 0:9b334a45a8ff 310 } else { // SPI_DATASIZE_16BIT
bogdanm 0:9b334a45a8ff 311 spi->DR = (uint16_t)value;
bogdanm 0:9b334a45a8ff 312 }
bogdanm 0:9b334a45a8ff 313 }
bogdanm 0:9b334a45a8ff 314
bogdanm 0:9b334a45a8ff 315 int spi_busy(spi_t *obj)
bogdanm 0:9b334a45a8ff 316 {
bogdanm 0:9b334a45a8ff 317 return ssp_busy(obj);
bogdanm 0:9b334a45a8ff 318 }
bogdanm 0:9b334a45a8ff 319
bogdanm 0:9b334a45a8ff 320 #endif