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targets/hal/TARGET_STM/TARGET_STM32L4/spi_api.c@144:ef7eb2e8f9f7, 2016-09-02 (annotated)

Committer:
<>
Date:
Fri Sep 02 15:07:44 2016 +0100
Revision:
144:ef7eb2e8f9f7
Parent:
0:9b334a45a8ff 
This updates the lib to the mbed lib v125

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 *******************************************************************************
<> 144:ef7eb2e8f9f7 3 * Copyright (c) 2015, STMicroelectronics
<> 144:ef7eb2e8f9f7 4 * All rights reserved.
<> 144:ef7eb2e8f9f7 5 *
<> 144:ef7eb2e8f9f7 6 * Redistribution and use in source and binary forms, with or without
<> 144:ef7eb2e8f9f7 7 * modification, are permitted provided that the following conditions are met:
<> 144:ef7eb2e8f9f7 8 *
<> 144:ef7eb2e8f9f7 9 * 1. Redistributions of source code must retain the above copyright notice,
<> 144:ef7eb2e8f9f7 10 * this list of conditions and the following disclaimer.
<> 144:ef7eb2e8f9f7 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
<> 144:ef7eb2e8f9f7 12 * this list of conditions and the following disclaimer in the documentation
<> 144:ef7eb2e8f9f7 13 * and/or other materials provided with the distribution.
<> 144:ef7eb2e8f9f7 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
<> 144:ef7eb2e8f9f7 15 * may be used to endorse or promote products derived from this software
<> 144:ef7eb2e8f9f7 16 * without specific prior written permission.
<> 144:ef7eb2e8f9f7 17 *
<> 144:ef7eb2e8f9f7 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
<> 144:ef7eb2e8f9f7 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
<> 144:ef7eb2e8f9f7 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
<> 144:ef7eb2e8f9f7 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
<> 144:ef7eb2e8f9f7 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
<> 144:ef7eb2e8f9f7 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
<> 144:ef7eb2e8f9f7 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
<> 144:ef7eb2e8f9f7 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
<> 144:ef7eb2e8f9f7 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
<> 144:ef7eb2e8f9f7 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
<> 144:ef7eb2e8f9f7 28 *******************************************************************************
<> 144:ef7eb2e8f9f7 29 */
<> 144:ef7eb2e8f9f7 30 #include "mbed_assert.h"
<> 144:ef7eb2e8f9f7 31 #include "spi_api.h"
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 #if DEVICE_SPI
<> 144:ef7eb2e8f9f7 34
<> 144:ef7eb2e8f9f7 35 #include <math.h>
<> 144:ef7eb2e8f9f7 36 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 37 #include "pinmap.h"
<> 144:ef7eb2e8f9f7 38 #include "mbed_error.h"
<> 144:ef7eb2e8f9f7 39 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 40
<> 144:ef7eb2e8f9f7 41 static SPI_HandleTypeDef SpiHandle;
<> 144:ef7eb2e8f9f7 42
<> 144:ef7eb2e8f9f7 43 static void init_spi(spi_t *obj)
<> 144:ef7eb2e8f9f7 44 {
<> 144:ef7eb2e8f9f7 45 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 __HAL_SPI_DISABLE(&SpiHandle);
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 SpiHandle.Init.Mode = obj->mode;
<> 144:ef7eb2e8f9f7 50 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
<> 144:ef7eb2e8f9f7 51 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
<> 144:ef7eb2e8f9f7 52 SpiHandle.Init.CLKPhase = obj->cpha;
<> 144:ef7eb2e8f9f7 53 SpiHandle.Init.CLKPolarity = obj->cpol;
<> 144:ef7eb2e8f9f7 54 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
<> 144:ef7eb2e8f9f7 55 SpiHandle.Init.CRCPolynomial = 7;
<> 144:ef7eb2e8f9f7 56 SpiHandle.Init.CRCLength = SPI_CRC_LENGTH_8BIT;
<> 144:ef7eb2e8f9f7 57 SpiHandle.Init.DataSize = obj->bits;
<> 144:ef7eb2e8f9f7 58 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
<> 144:ef7eb2e8f9f7 59 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLE;
<> 144:ef7eb2e8f9f7 60 SpiHandle.Init.NSS = obj->nss;
<> 144:ef7eb2e8f9f7 61 SpiHandle.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
<> 144:ef7eb2e8f9f7 62
<> 144:ef7eb2e8f9f7 63 if (HAL_SPI_Init(&SpiHandle) != HAL_OK) {
<> 144:ef7eb2e8f9f7 64 error("Cannot initialize SPI\n");
<> 144:ef7eb2e8f9f7 65 }
<> 144:ef7eb2e8f9f7 66
<> 144:ef7eb2e8f9f7 67 __HAL_SPI_ENABLE(&SpiHandle);
<> 144:ef7eb2e8f9f7 68 }
<> 144:ef7eb2e8f9f7 69
<> 144:ef7eb2e8f9f7 70 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
<> 144:ef7eb2e8f9f7 71 {
<> 144:ef7eb2e8f9f7 72 // Determine the SPI to use
<> 144:ef7eb2e8f9f7 73 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
<> 144:ef7eb2e8f9f7 74 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
<> 144:ef7eb2e8f9f7 75 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
<> 144:ef7eb2e8f9f7 76 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
<> 144:ef7eb2e8f9f7 77
<> 144:ef7eb2e8f9f7 78 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
<> 144:ef7eb2e8f9f7 79 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
<> 144:ef7eb2e8f9f7 80
<> 144:ef7eb2e8f9f7 81 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
<> 144:ef7eb2e8f9f7 82 MBED_ASSERT(obj->spi != (SPIName)NC);
<> 144:ef7eb2e8f9f7 83
<> 144:ef7eb2e8f9f7 84 // Enable SPI clock
<> 144:ef7eb2e8f9f7 85 if (obj->spi == SPI_1) {
<> 144:ef7eb2e8f9f7 86 __HAL_RCC_SPI1_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 87 }
<> 144:ef7eb2e8f9f7 88 #if defined(SPI2_BASE)
<> 144:ef7eb2e8f9f7 89 if (obj->spi == SPI_2) {
<> 144:ef7eb2e8f9f7 90 __HAL_RCC_SPI2_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 91 }
<> 144:ef7eb2e8f9f7 92 #endif
<> 144:ef7eb2e8f9f7 93 if (obj->spi == SPI_3) {
<> 144:ef7eb2e8f9f7 94 __HAL_RCC_SPI3_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 95 }
<> 144:ef7eb2e8f9f7 96
<> 144:ef7eb2e8f9f7 97 // Configure the SPI pins
<> 144:ef7eb2e8f9f7 98 pinmap_pinout(mosi, PinMap_SPI_MOSI);
<> 144:ef7eb2e8f9f7 99 pinmap_pinout(miso, PinMap_SPI_MISO);
<> 144:ef7eb2e8f9f7 100 pinmap_pinout(sclk, PinMap_SPI_SCLK);
<> 144:ef7eb2e8f9f7 101
<> 144:ef7eb2e8f9f7 102 // Save new values
<> 144:ef7eb2e8f9f7 103 obj->bits = SPI_DATASIZE_8BIT;
<> 144:ef7eb2e8f9f7 104 obj->cpol = SPI_POLARITY_LOW;
<> 144:ef7eb2e8f9f7 105 obj->cpha = SPI_PHASE_1EDGE;
<> 144:ef7eb2e8f9f7 106 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
<> 144:ef7eb2e8f9f7 107
<> 144:ef7eb2e8f9f7 108 obj->pin_miso = miso;
<> 144:ef7eb2e8f9f7 109 obj->pin_mosi = mosi;
<> 144:ef7eb2e8f9f7 110 obj->pin_sclk = sclk;
<> 144:ef7eb2e8f9f7 111 obj->pin_ssel = ssel;
<> 144:ef7eb2e8f9f7 112
<> 144:ef7eb2e8f9f7 113 if (ssel == NC) { // SW NSS Master mode
<> 144:ef7eb2e8f9f7 114 obj->mode = SPI_MODE_MASTER;
<> 144:ef7eb2e8f9f7 115 obj->nss = SPI_NSS_SOFT;
<> 144:ef7eb2e8f9f7 116 } else { // Slave
<> 144:ef7eb2e8f9f7 117 pinmap_pinout(ssel, PinMap_SPI_SSEL);
<> 144:ef7eb2e8f9f7 118 obj->mode = SPI_MODE_SLAVE;
<> 144:ef7eb2e8f9f7 119 obj->nss = SPI_NSS_HARD_INPUT;
<> 144:ef7eb2e8f9f7 120 }
<> 144:ef7eb2e8f9f7 121
<> 144:ef7eb2e8f9f7 122 init_spi(obj);
<> 144:ef7eb2e8f9f7 123 }
<> 144:ef7eb2e8f9f7 124
<> 144:ef7eb2e8f9f7 125 void spi_free(spi_t *obj)
<> 144:ef7eb2e8f9f7 126 {
<> 144:ef7eb2e8f9f7 127 // Reset SPI and disable clock
<> 144:ef7eb2e8f9f7 128 if (obj->spi == SPI_1) {
<> 144:ef7eb2e8f9f7 129 __HAL_RCC_SPI1_FORCE_RESET();
<> 144:ef7eb2e8f9f7 130 __HAL_RCC_SPI1_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 131 __HAL_RCC_SPI1_CLK_DISABLE();
<> 144:ef7eb2e8f9f7 132 }
<> 144:ef7eb2e8f9f7 133
<> 144:ef7eb2e8f9f7 134 #if defined(SPI2_BASE)
<> 144:ef7eb2e8f9f7 135 if (obj->spi == SPI_2) {
<> 144:ef7eb2e8f9f7 136 __HAL_RCC_SPI2_FORCE_RESET();
<> 144:ef7eb2e8f9f7 137 __HAL_RCC_SPI2_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 138 __HAL_RCC_SPI2_CLK_DISABLE();
<> 144:ef7eb2e8f9f7 139 }
<> 144:ef7eb2e8f9f7 140 #endif
<> 144:ef7eb2e8f9f7 141
<> 144:ef7eb2e8f9f7 142 if (obj->spi == SPI_3) {
<> 144:ef7eb2e8f9f7 143 __HAL_RCC_SPI3_FORCE_RESET();
<> 144:ef7eb2e8f9f7 144 __HAL_RCC_SPI3_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 145 __HAL_RCC_SPI3_CLK_DISABLE();
<> 144:ef7eb2e8f9f7 146 }
<> 144:ef7eb2e8f9f7 147
<> 144:ef7eb2e8f9f7 148 // Configure GPIO
<> 144:ef7eb2e8f9f7 149 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
<> 144:ef7eb2e8f9f7 150 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
<> 144:ef7eb2e8f9f7 151 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
<> 144:ef7eb2e8f9f7 152 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
<> 144:ef7eb2e8f9f7 153 }
<> 144:ef7eb2e8f9f7 154
<> 144:ef7eb2e8f9f7 155 void spi_format(spi_t *obj, int bits, int mode, int slave)
<> 144:ef7eb2e8f9f7 156 {
<> 144:ef7eb2e8f9f7 157 // Save new values
<> 144:ef7eb2e8f9f7 158 if (bits == 16) {
<> 144:ef7eb2e8f9f7 159 obj->bits = SPI_DATASIZE_16BIT;
<> 144:ef7eb2e8f9f7 160 } else {
<> 144:ef7eb2e8f9f7 161 obj->bits = SPI_DATASIZE_8BIT;
<> 144:ef7eb2e8f9f7 162 }
<> 144:ef7eb2e8f9f7 163
<> 144:ef7eb2e8f9f7 164 switch (mode) {
<> 144:ef7eb2e8f9f7 165 case 0:
<> 144:ef7eb2e8f9f7 166 obj->cpol = SPI_POLARITY_LOW;
<> 144:ef7eb2e8f9f7 167 obj->cpha = SPI_PHASE_1EDGE;
<> 144:ef7eb2e8f9f7 168 break;
<> 144:ef7eb2e8f9f7 169 case 1:
<> 144:ef7eb2e8f9f7 170 obj->cpol = SPI_POLARITY_LOW;
<> 144:ef7eb2e8f9f7 171 obj->cpha = SPI_PHASE_2EDGE;
<> 144:ef7eb2e8f9f7 172 break;
<> 144:ef7eb2e8f9f7 173 case 2:
<> 144:ef7eb2e8f9f7 174 obj->cpol = SPI_POLARITY_HIGH;
<> 144:ef7eb2e8f9f7 175 obj->cpha = SPI_PHASE_1EDGE;
<> 144:ef7eb2e8f9f7 176 break;
<> 144:ef7eb2e8f9f7 177 default:
<> 144:ef7eb2e8f9f7 178 obj->cpol = SPI_POLARITY_HIGH;
<> 144:ef7eb2e8f9f7 179 obj->cpha = SPI_PHASE_2EDGE;
<> 144:ef7eb2e8f9f7 180 break;
<> 144:ef7eb2e8f9f7 181 }
<> 144:ef7eb2e8f9f7 182
<> 144:ef7eb2e8f9f7 183 if (slave == 0) {
<> 144:ef7eb2e8f9f7 184 obj->mode = SPI_MODE_MASTER;
<> 144:ef7eb2e8f9f7 185 obj->nss = SPI_NSS_SOFT;
<> 144:ef7eb2e8f9f7 186 } else {
<> 144:ef7eb2e8f9f7 187 obj->mode = SPI_MODE_SLAVE;
<> 144:ef7eb2e8f9f7 188 obj->nss = SPI_NSS_HARD_INPUT;
<> 144:ef7eb2e8f9f7 189 }
<> 144:ef7eb2e8f9f7 190
<> 144:ef7eb2e8f9f7 191 init_spi(obj);
<> 144:ef7eb2e8f9f7 192 }
<> 144:ef7eb2e8f9f7 193
<> 144:ef7eb2e8f9f7 194 static const uint16_t baudrate_prescaler_table[] = {SPI_BAUDRATEPRESCALER_2,
<> 144:ef7eb2e8f9f7 195 SPI_BAUDRATEPRESCALER_4,
<> 144:ef7eb2e8f9f7 196 SPI_BAUDRATEPRESCALER_8,
<> 144:ef7eb2e8f9f7 197 SPI_BAUDRATEPRESCALER_16,
<> 144:ef7eb2e8f9f7 198 SPI_BAUDRATEPRESCALER_32,
<> 144:ef7eb2e8f9f7 199 SPI_BAUDRATEPRESCALER_64,
<> 144:ef7eb2e8f9f7 200 SPI_BAUDRATEPRESCALER_128,
<> 144:ef7eb2e8f9f7 201 SPI_BAUDRATEPRESCALER_256};
<> 144:ef7eb2e8f9f7 202
<> 144:ef7eb2e8f9f7 203 void spi_frequency(spi_t *obj, int hz)
<> 144:ef7eb2e8f9f7 204 {
<> 144:ef7eb2e8f9f7 205 int spi_hz = 0;
<> 144:ef7eb2e8f9f7 206 uint8_t prescaler_rank = 0;
<> 144:ef7eb2e8f9f7 207
<> 144:ef7eb2e8f9f7 208 /* Get source clock depending on SPI instance */
<> 144:ef7eb2e8f9f7 209 switch ((int)obj->spi) {
<> 144:ef7eb2e8f9f7 210 case SPI_1:
<> 144:ef7eb2e8f9f7 211 /* SPI_1. Source CLK is PCKL2 */
<> 144:ef7eb2e8f9f7 212 spi_hz = HAL_RCC_GetPCLK2Freq();
<> 144:ef7eb2e8f9f7 213 break;
<> 144:ef7eb2e8f9f7 214 #if defined(SPI2_BASE)
<> 144:ef7eb2e8f9f7 215 case SPI_2:
<> 144:ef7eb2e8f9f7 216 #endif
<> 144:ef7eb2e8f9f7 217 case SPI_3:
<> 144:ef7eb2e8f9f7 218 /* SPI_2, SPI_3. Source CLK is PCKL1 */
<> 144:ef7eb2e8f9f7 219 spi_hz = HAL_RCC_GetPCLK1Freq();
<> 144:ef7eb2e8f9f7 220 break;
<> 144:ef7eb2e8f9f7 221 default:
<> 144:ef7eb2e8f9f7 222 error("SPI instance not set");
<> 144:ef7eb2e8f9f7 223 }
<> 144:ef7eb2e8f9f7 224
<> 144:ef7eb2e8f9f7 225 /* Define pre-scaler in order to get highest available frequency below requested frequency */
<> 144:ef7eb2e8f9f7 226 while ((spi_hz > hz) && (prescaler_rank < sizeof(baudrate_prescaler_table)/sizeof(baudrate_prescaler_table[0]))){
<> 144:ef7eb2e8f9f7 227 spi_hz = spi_hz / 2;
<> 144:ef7eb2e8f9f7 228 prescaler_rank++;
<> 144:ef7eb2e8f9f7 229 }
<> 144:ef7eb2e8f9f7 230
<> 144:ef7eb2e8f9f7 231 if (prescaler_rank <= sizeof(baudrate_prescaler_table)/sizeof(baudrate_prescaler_table[0])) {
<> 144:ef7eb2e8f9f7 232 obj->br_presc = baudrate_prescaler_table[prescaler_rank-1];
<> 144:ef7eb2e8f9f7 233 } else {
<> 144:ef7eb2e8f9f7 234 error("Couldn't setup requested SPI frequency");
<> 144:ef7eb2e8f9f7 235 }
<> 144:ef7eb2e8f9f7 236
<> 144:ef7eb2e8f9f7 237 init_spi(obj);
<> 144:ef7eb2e8f9f7 238 }
<> 144:ef7eb2e8f9f7 239
<> 144:ef7eb2e8f9f7 240 static inline int ssp_readable(spi_t *obj)
<> 144:ef7eb2e8f9f7 241 {
<> 144:ef7eb2e8f9f7 242 int status;
<> 144:ef7eb2e8f9f7 243 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
<> 144:ef7eb2e8f9f7 244 // Check if data is received
<> 144:ef7eb2e8f9f7 245 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
<> 144:ef7eb2e8f9f7 246 return status;
<> 144:ef7eb2e8f9f7 247 }
<> 144:ef7eb2e8f9f7 248
<> 144:ef7eb2e8f9f7 249 static inline int ssp_writeable(spi_t *obj)
<> 144:ef7eb2e8f9f7 250 {
<> 144:ef7eb2e8f9f7 251 int status;
<> 144:ef7eb2e8f9f7 252 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
<> 144:ef7eb2e8f9f7 253 // Check if data is transmitted
<> 144:ef7eb2e8f9f7 254 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
<> 144:ef7eb2e8f9f7 255 return status;
<> 144:ef7eb2e8f9f7 256 }
<> 144:ef7eb2e8f9f7 257
<> 144:ef7eb2e8f9f7 258 static inline void ssp_write(spi_t *obj, int value)
<> 144:ef7eb2e8f9f7 259 {
<> 144:ef7eb2e8f9f7 260 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
<> 144:ef7eb2e8f9f7 261 while (!ssp_writeable(obj));
<> 144:ef7eb2e8f9f7 262 //spi->DR = (uint16_t)value;
<> 144:ef7eb2e8f9f7 263 if (obj->bits == SPI_DATASIZE_8BIT) {
<> 144:ef7eb2e8f9f7 264 // Force 8-bit access to the data register
<> 144:ef7eb2e8f9f7 265 uint8_t *p_spi_dr = 0;
<> 144:ef7eb2e8f9f7 266 p_spi_dr = (uint8_t *) & (spi->DR);
<> 144:ef7eb2e8f9f7 267 *p_spi_dr = (uint8_t)value;
<> 144:ef7eb2e8f9f7 268 } else { // SPI_DATASIZE_16BIT
<> 144:ef7eb2e8f9f7 269 spi->DR = (uint16_t)value;
<> 144:ef7eb2e8f9f7 270 }
<> 144:ef7eb2e8f9f7 271 }
<> 144:ef7eb2e8f9f7 272
<> 144:ef7eb2e8f9f7 273 static inline int ssp_read(spi_t *obj)
<> 144:ef7eb2e8f9f7 274 {
<> 144:ef7eb2e8f9f7 275 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
<> 144:ef7eb2e8f9f7 276 while (!ssp_readable(obj));
<> 144:ef7eb2e8f9f7 277 //return (int)spi->DR;
<> 144:ef7eb2e8f9f7 278 if (obj->bits == SPI_DATASIZE_8BIT) {
<> 144:ef7eb2e8f9f7 279 // Force 8-bit access to the data register
<> 144:ef7eb2e8f9f7 280 uint8_t *p_spi_dr = 0;
<> 144:ef7eb2e8f9f7 281 p_spi_dr = (uint8_t *) & (spi->DR);
<> 144:ef7eb2e8f9f7 282 return (int)(*p_spi_dr);
<> 144:ef7eb2e8f9f7 283 } else {
<> 144:ef7eb2e8f9f7 284 return (int)spi->DR;
<> 144:ef7eb2e8f9f7 285 }
<> 144:ef7eb2e8f9f7 286 }
<> 144:ef7eb2e8f9f7 287
<> 144:ef7eb2e8f9f7 288 static inline int ssp_busy(spi_t *obj)
<> 144:ef7eb2e8f9f7 289 {
<> 144:ef7eb2e8f9f7 290 int status;
<> 144:ef7eb2e8f9f7 291 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
<> 144:ef7eb2e8f9f7 292 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
<> 144:ef7eb2e8f9f7 293 return status;
<> 144:ef7eb2e8f9f7 294 }
<> 144:ef7eb2e8f9f7 295
<> 144:ef7eb2e8f9f7 296 int spi_master_write(spi_t *obj, int value)
<> 144:ef7eb2e8f9f7 297 {
<> 144:ef7eb2e8f9f7 298 ssp_write(obj, value);
<> 144:ef7eb2e8f9f7 299 return ssp_read(obj);
<> 144:ef7eb2e8f9f7 300 }
<> 144:ef7eb2e8f9f7 301
<> 144:ef7eb2e8f9f7 302 int spi_slave_receive(spi_t *obj)
<> 144:ef7eb2e8f9f7 303 {
<> 144:ef7eb2e8f9f7 304 return (ssp_readable(obj) ? 1 : 0);
<> 144:ef7eb2e8f9f7 305 };
<> 144:ef7eb2e8f9f7 306
<> 144:ef7eb2e8f9f7 307 int spi_slave_read(spi_t *obj)
<> 144:ef7eb2e8f9f7 308 {
<> 144:ef7eb2e8f9f7 309 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
<> 144:ef7eb2e8f9f7 310 while (!ssp_readable(obj));
<> 144:ef7eb2e8f9f7 311 //return (int)spi->DR;
<> 144:ef7eb2e8f9f7 312 if (obj->bits == SPI_DATASIZE_8BIT) {
<> 144:ef7eb2e8f9f7 313 // Force 8-bit access to the data register
<> 144:ef7eb2e8f9f7 314 uint8_t *p_spi_dr = 0;
<> 144:ef7eb2e8f9f7 315 p_spi_dr = (uint8_t *) & (spi->DR);
<> 144:ef7eb2e8f9f7 316 return (int)(*p_spi_dr);
<> 144:ef7eb2e8f9f7 317 } else {
<> 144:ef7eb2e8f9f7 318 return (int)spi->DR;
<> 144:ef7eb2e8f9f7 319 }
<> 144:ef7eb2e8f9f7 320 }
<> 144:ef7eb2e8f9f7 321
<> 144:ef7eb2e8f9f7 322 void spi_slave_write(spi_t *obj, int value)
<> 144:ef7eb2e8f9f7 323 {
<> 144:ef7eb2e8f9f7 324 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
<> 144:ef7eb2e8f9f7 325 while (!ssp_writeable(obj));
<> 144:ef7eb2e8f9f7 326 //spi->DR = (uint16_t)value;
<> 144:ef7eb2e8f9f7 327 if (obj->bits == SPI_DATASIZE_8BIT) {
<> 144:ef7eb2e8f9f7 328 // Force 8-bit access to the data register
<> 144:ef7eb2e8f9f7 329 uint8_t *p_spi_dr = 0;
<> 144:ef7eb2e8f9f7 330 p_spi_dr = (uint8_t *) & (spi->DR);
<> 144:ef7eb2e8f9f7 331 *p_spi_dr = (uint8_t)value;
<> 144:ef7eb2e8f9f7 332 } else { // SPI_DATASIZE_16BIT
<> 144:ef7eb2e8f9f7 333 spi->DR = (uint16_t)value;
<> 144:ef7eb2e8f9f7 334 }
<> 144:ef7eb2e8f9f7 335 }
<> 144:ef7eb2e8f9f7 336
<> 144:ef7eb2e8f9f7 337 int spi_busy(spi_t *obj)
<> 144:ef7eb2e8f9f7 338 {
<> 144:ef7eb2e8f9f7 339 return ssp_busy(obj);
<> 144:ef7eb2e8f9f7 340 }
<> 144:ef7eb2e8f9f7 341
<> 144:ef7eb2e8f9f7 342 #endif