Johannes Stratmann / mbed-dev

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targets/hal/TARGET_STM/TARGET_STM32F3/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) 2014, 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 "mbed_error.h"
<> 144:ef7eb2e8f9f7 32 #include "spi_api.h"
<> 144:ef7eb2e8f9f7 33
<> 144:ef7eb2e8f9f7 34 #if DEVICE_SPI
<> 144:ef7eb2e8f9f7 35
<> 144:ef7eb2e8f9f7 36 #include <math.h>
<> 144:ef7eb2e8f9f7 37 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 38 #include "pinmap.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_DISABLED;
<> 144:ef7eb2e8f9f7 55 SpiHandle.Init.CRCPolynomial = 7;
<> 144:ef7eb2e8f9f7 56 SpiHandle.Init.DataSize = obj->bits;
<> 144:ef7eb2e8f9f7 57 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
<> 144:ef7eb2e8f9f7 58 SpiHandle.Init.NSS = obj->nss;
<> 144:ef7eb2e8f9f7 59 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
<> 144:ef7eb2e8f9f7 60
<> 144:ef7eb2e8f9f7 61 HAL_SPI_Init(&SpiHandle);
<> 144:ef7eb2e8f9f7 62
<> 144:ef7eb2e8f9f7 63 __HAL_SPI_ENABLE(&SpiHandle);
<> 144:ef7eb2e8f9f7 64 }
<> 144:ef7eb2e8f9f7 65
<> 144:ef7eb2e8f9f7 66 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
<> 144:ef7eb2e8f9f7 67 {
<> 144:ef7eb2e8f9f7 68 // Determine the SPI to use
<> 144:ef7eb2e8f9f7 69 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
<> 144:ef7eb2e8f9f7 70 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
<> 144:ef7eb2e8f9f7 71 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
<> 144:ef7eb2e8f9f7 72 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
<> 144:ef7eb2e8f9f7 73
<> 144:ef7eb2e8f9f7 74 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
<> 144:ef7eb2e8f9f7 75 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
<> 144:ef7eb2e8f9f7 76
<> 144:ef7eb2e8f9f7 77 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
<> 144:ef7eb2e8f9f7 78 MBED_ASSERT(obj->spi != (SPIName)NC);
<> 144:ef7eb2e8f9f7 79
<> 144:ef7eb2e8f9f7 80 // Enable SPI clock
<> 144:ef7eb2e8f9f7 81 #if defined(SPI1_BASE)
<> 144:ef7eb2e8f9f7 82 if (obj->spi == SPI_1) {
<> 144:ef7eb2e8f9f7 83 __SPI1_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 84 }
<> 144:ef7eb2e8f9f7 85 #endif
<> 144:ef7eb2e8f9f7 86
<> 144:ef7eb2e8f9f7 87 #if defined(SPI2_BASE)
<> 144:ef7eb2e8f9f7 88 if (obj->spi == SPI_2) {
<> 144:ef7eb2e8f9f7 89 __SPI2_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 90 }
<> 144:ef7eb2e8f9f7 91 #endif
<> 144:ef7eb2e8f9f7 92
<> 144:ef7eb2e8f9f7 93 #if defined(SPI3_BASE)
<> 144:ef7eb2e8f9f7 94 if (obj->spi == SPI_3) {
<> 144:ef7eb2e8f9f7 95 __SPI3_CLK_ENABLE();
<> 144:ef7eb2e8f9f7 96 }
<> 144:ef7eb2e8f9f7 97 #endif
<> 144:ef7eb2e8f9f7 98
<> 144:ef7eb2e8f9f7 99 // Configure the SPI pins
<> 144:ef7eb2e8f9f7 100 pinmap_pinout(mosi, PinMap_SPI_MOSI);
<> 144:ef7eb2e8f9f7 101 pinmap_pinout(miso, PinMap_SPI_MISO);
<> 144:ef7eb2e8f9f7 102 pinmap_pinout(sclk, PinMap_SPI_SCLK);
<> 144:ef7eb2e8f9f7 103
<> 144:ef7eb2e8f9f7 104 // Save new values
<> 144:ef7eb2e8f9f7 105 obj->bits = SPI_DATASIZE_8BIT;
<> 144:ef7eb2e8f9f7 106 obj->cpol = SPI_POLARITY_LOW;
<> 144:ef7eb2e8f9f7 107 obj->cpha = SPI_PHASE_1EDGE;
<> 144:ef7eb2e8f9f7 108 #if defined(TARGET_STM32F334C8)
<> 144:ef7eb2e8f9f7 109 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
<> 144:ef7eb2e8f9f7 110 #else
<> 144:ef7eb2e8f9f7 111 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz (HSI) or 1.13 MHz (HSE)
<> 144:ef7eb2e8f9f7 112 #endif
<> 144:ef7eb2e8f9f7 113
<> 144:ef7eb2e8f9f7 114 obj->pin_miso = miso;
<> 144:ef7eb2e8f9f7 115 obj->pin_mosi = mosi;
<> 144:ef7eb2e8f9f7 116 obj->pin_sclk = sclk;
<> 144:ef7eb2e8f9f7 117 obj->pin_ssel = ssel;
<> 144:ef7eb2e8f9f7 118
<> 144:ef7eb2e8f9f7 119 if (ssel != NC) {
<> 144:ef7eb2e8f9f7 120 pinmap_pinout(ssel, PinMap_SPI_SSEL);
<> 144:ef7eb2e8f9f7 121 } else {
<> 144:ef7eb2e8f9f7 122 obj->nss = SPI_NSS_SOFT;
<> 144:ef7eb2e8f9f7 123 }
<> 144:ef7eb2e8f9f7 124
<> 144:ef7eb2e8f9f7 125 init_spi(obj);
<> 144:ef7eb2e8f9f7 126 }
<> 144:ef7eb2e8f9f7 127
<> 144:ef7eb2e8f9f7 128 void spi_free(spi_t *obj)
<> 144:ef7eb2e8f9f7 129 {
<> 144:ef7eb2e8f9f7 130 // Reset SPI and disable clock
<> 144:ef7eb2e8f9f7 131 #if defined(SPI1_BASE)
<> 144:ef7eb2e8f9f7 132 if (obj->spi == SPI_1) {
<> 144:ef7eb2e8f9f7 133 __SPI1_FORCE_RESET();
<> 144:ef7eb2e8f9f7 134 __SPI1_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 135 __SPI1_CLK_DISABLE();
<> 144:ef7eb2e8f9f7 136 }
<> 144:ef7eb2e8f9f7 137 #endif
<> 144:ef7eb2e8f9f7 138
<> 144:ef7eb2e8f9f7 139 #if defined(SPI2_BASE)
<> 144:ef7eb2e8f9f7 140 if (obj->spi == SPI_2) {
<> 144:ef7eb2e8f9f7 141 __SPI2_FORCE_RESET();
<> 144:ef7eb2e8f9f7 142 __SPI2_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 143 __SPI2_CLK_DISABLE();
<> 144:ef7eb2e8f9f7 144 }
<> 144:ef7eb2e8f9f7 145 #endif
<> 144:ef7eb2e8f9f7 146
<> 144:ef7eb2e8f9f7 147 #if defined(SPI3_BASE)
<> 144:ef7eb2e8f9f7 148 if (obj->spi == SPI_3) {
<> 144:ef7eb2e8f9f7 149 __SPI3_FORCE_RESET();
<> 144:ef7eb2e8f9f7 150 __SPI3_RELEASE_RESET();
<> 144:ef7eb2e8f9f7 151 __SPI3_CLK_DISABLE();
<> 144:ef7eb2e8f9f7 152 }
<> 144:ef7eb2e8f9f7 153 #endif
<> 144:ef7eb2e8f9f7 154
<> 144:ef7eb2e8f9f7 155 // Configure GPIOs
<> 144:ef7eb2e8f9f7 156 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
<> 144:ef7eb2e8f9f7 157 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
<> 144:ef7eb2e8f9f7 158 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
<> 144:ef7eb2e8f9f7 159 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
<> 144:ef7eb2e8f9f7 160 }
<> 144:ef7eb2e8f9f7 161
<> 144:ef7eb2e8f9f7 162 void spi_format(spi_t *obj, int bits, int mode, int slave)
<> 144:ef7eb2e8f9f7 163 {
<> 144:ef7eb2e8f9f7 164 // Save new values
<> 144:ef7eb2e8f9f7 165 if (bits == 16) {
<> 144:ef7eb2e8f9f7 166 obj->bits = SPI_DATASIZE_16BIT;
<> 144:ef7eb2e8f9f7 167 } else {
<> 144:ef7eb2e8f9f7 168 obj->bits = SPI_DATASIZE_8BIT;
<> 144:ef7eb2e8f9f7 169 }
<> 144:ef7eb2e8f9f7 170
<> 144:ef7eb2e8f9f7 171 switch (mode) {
<> 144:ef7eb2e8f9f7 172 case 0:
<> 144:ef7eb2e8f9f7 173 obj->cpol = SPI_POLARITY_LOW;
<> 144:ef7eb2e8f9f7 174 obj->cpha = SPI_PHASE_1EDGE;
<> 144:ef7eb2e8f9f7 175 break;
<> 144:ef7eb2e8f9f7 176 case 1:
<> 144:ef7eb2e8f9f7 177 obj->cpol = SPI_POLARITY_LOW;
<> 144:ef7eb2e8f9f7 178 obj->cpha = SPI_PHASE_2EDGE;
<> 144:ef7eb2e8f9f7 179 break;
<> 144:ef7eb2e8f9f7 180 case 2:
<> 144:ef7eb2e8f9f7 181 obj->cpol = SPI_POLARITY_HIGH;
<> 144:ef7eb2e8f9f7 182 obj->cpha = SPI_PHASE_1EDGE;
<> 144:ef7eb2e8f9f7 183 break;
<> 144:ef7eb2e8f9f7 184 default:
<> 144:ef7eb2e8f9f7 185 obj->cpol = SPI_POLARITY_HIGH;
<> 144:ef7eb2e8f9f7 186 obj->cpha = SPI_PHASE_2EDGE;
<> 144:ef7eb2e8f9f7 187 break;
<> 144:ef7eb2e8f9f7 188 }
<> 144:ef7eb2e8f9f7 189
<> 144:ef7eb2e8f9f7 190 if (obj->nss != SPI_NSS_SOFT) {
<> 144:ef7eb2e8f9f7 191 obj->nss = (slave) ? SPI_NSS_HARD_INPUT : SPI_NSS_HARD_OUTPUT;
<> 144:ef7eb2e8f9f7 192 }
<> 144:ef7eb2e8f9f7 193
<> 144:ef7eb2e8f9f7 194 obj->mode = (slave) ? SPI_MODE_SLAVE : SPI_MODE_MASTER;
<> 144:ef7eb2e8f9f7 195
<> 144:ef7eb2e8f9f7 196 init_spi(obj);
<> 144:ef7eb2e8f9f7 197 }
<> 144:ef7eb2e8f9f7 198
<> 144:ef7eb2e8f9f7 199 static const uint16_t baudrate_prescaler_table[] = {SPI_BAUDRATEPRESCALER_2,
<> 144:ef7eb2e8f9f7 200 SPI_BAUDRATEPRESCALER_4,
<> 144:ef7eb2e8f9f7 201 SPI_BAUDRATEPRESCALER_8,
<> 144:ef7eb2e8f9f7 202 SPI_BAUDRATEPRESCALER_16,
<> 144:ef7eb2e8f9f7 203 SPI_BAUDRATEPRESCALER_32,
<> 144:ef7eb2e8f9f7 204 SPI_BAUDRATEPRESCALER_64,
<> 144:ef7eb2e8f9f7 205 SPI_BAUDRATEPRESCALER_128,
<> 144:ef7eb2e8f9f7 206 SPI_BAUDRATEPRESCALER_256};
<> 144:ef7eb2e8f9f7 207
<> 144:ef7eb2e8f9f7 208 void spi_frequency(spi_t *obj, int hz)
<> 144:ef7eb2e8f9f7 209 {
<> 144:ef7eb2e8f9f7 210 int spi_hz = 0;
<> 144:ef7eb2e8f9f7 211 uint8_t prescaler_rank = 0;
<> 144:ef7eb2e8f9f7 212
<> 144:ef7eb2e8f9f7 213 /* Get source clock depending on SPI instance */
<> 144:ef7eb2e8f9f7 214 switch ((int)obj->spi) {
<> 144:ef7eb2e8f9f7 215 #if defined SPI1_BASE
<> 144:ef7eb2e8f9f7 216 case SPI_1:
<> 144:ef7eb2e8f9f7 217 /* SPI_1. Source CLK is PCKL2 */
<> 144:ef7eb2e8f9f7 218 spi_hz = HAL_RCC_GetPCLK2Freq();
<> 144:ef7eb2e8f9f7 219 break;
<> 144:ef7eb2e8f9f7 220 #endif
<> 144:ef7eb2e8f9f7 221 #if defined SPI2_BASE
<> 144:ef7eb2e8f9f7 222 case SPI_2:
<> 144:ef7eb2e8f9f7 223 #endif
<> 144:ef7eb2e8f9f7 224 #if defined SPI3_BASE
<> 144:ef7eb2e8f9f7 225 case SPI_3:
<> 144:ef7eb2e8f9f7 226 #endif
<> 144:ef7eb2e8f9f7 227 /* SPI_2 and SPI_3. Source CLK is PCKL1 */
<> 144:ef7eb2e8f9f7 228 spi_hz = HAL_RCC_GetPCLK1Freq();
<> 144:ef7eb2e8f9f7 229 break;
<> 144:ef7eb2e8f9f7 230 default:
<> 144:ef7eb2e8f9f7 231 error("SPI instance not set");
<> 144:ef7eb2e8f9f7 232 }
<> 144:ef7eb2e8f9f7 233
<> 144:ef7eb2e8f9f7 234 /* Define pre-scaler in order to get highest available frequency below requested frequency */
<> 144:ef7eb2e8f9f7 235 while ((spi_hz > hz) && (prescaler_rank < sizeof(baudrate_prescaler_table)/sizeof(baudrate_prescaler_table[0]))){
<> 144:ef7eb2e8f9f7 236 spi_hz = spi_hz / 2;
<> 144:ef7eb2e8f9f7 237 prescaler_rank++;
<> 144:ef7eb2e8f9f7 238 }
<> 144:ef7eb2e8f9f7 239
<> 144:ef7eb2e8f9f7 240 if (prescaler_rank <= sizeof(baudrate_prescaler_table)/sizeof(baudrate_prescaler_table[0])) {
<> 144:ef7eb2e8f9f7 241 obj->br_presc = baudrate_prescaler_table[prescaler_rank-1];
<> 144:ef7eb2e8f9f7 242 } else {
<> 144:ef7eb2e8f9f7 243 error("Couldn't setup requested SPI frequency");
<> 144:ef7eb2e8f9f7 244 }
<> 144:ef7eb2e8f9f7 245
<> 144:ef7eb2e8f9f7 246 init_spi(obj);
<> 144:ef7eb2e8f9f7 247 }
<> 144:ef7eb2e8f9f7 248
<> 144:ef7eb2e8f9f7 249 static inline int ssp_readable(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 received
<> 144:ef7eb2e8f9f7 254 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
<> 144:ef7eb2e8f9f7 255 return status;
<> 144:ef7eb2e8f9f7 256 }
<> 144:ef7eb2e8f9f7 257
<> 144:ef7eb2e8f9f7 258 static inline int ssp_writeable(spi_t *obj)
<> 144:ef7eb2e8f9f7 259 {
<> 144:ef7eb2e8f9f7 260 int status;
<> 144:ef7eb2e8f9f7 261 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
<> 144:ef7eb2e8f9f7 262 // Check if data is transmitted
<> 144:ef7eb2e8f9f7 263 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
<> 144:ef7eb2e8f9f7 264 return status;
<> 144:ef7eb2e8f9f7 265 }
<> 144:ef7eb2e8f9f7 266
<> 144:ef7eb2e8f9f7 267 static inline void ssp_write(spi_t *obj, int value)
<> 144:ef7eb2e8f9f7 268 {
<> 144:ef7eb2e8f9f7 269 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
<> 144:ef7eb2e8f9f7 270 while (!ssp_writeable(obj));
<> 144:ef7eb2e8f9f7 271 if (obj->bits == SPI_DATASIZE_8BIT) {
<> 144:ef7eb2e8f9f7 272 // Force 8-bit access to the data register
<> 144:ef7eb2e8f9f7 273 uint8_t *p_spi_dr = 0;
<> 144:ef7eb2e8f9f7 274 p_spi_dr = (uint8_t *) & (spi->DR);
<> 144:ef7eb2e8f9f7 275 *p_spi_dr = (uint8_t)value;
<> 144:ef7eb2e8f9f7 276 } else { // SPI_DATASIZE_16BIT
<> 144:ef7eb2e8f9f7 277 spi->DR = (uint16_t)value;
<> 144:ef7eb2e8f9f7 278 }
<> 144:ef7eb2e8f9f7 279 }
<> 144:ef7eb2e8f9f7 280
<> 144:ef7eb2e8f9f7 281 static inline int ssp_read(spi_t *obj)
<> 144:ef7eb2e8f9f7 282 {
<> 144:ef7eb2e8f9f7 283 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
<> 144:ef7eb2e8f9f7 284 while (!ssp_readable(obj));
<> 144:ef7eb2e8f9f7 285 if (obj->bits == SPI_DATASIZE_8BIT) {
<> 144:ef7eb2e8f9f7 286 // Force 8-bit access to the data register
<> 144:ef7eb2e8f9f7 287 uint8_t *p_spi_dr = 0;
<> 144:ef7eb2e8f9f7 288 p_spi_dr = (uint8_t *) & (spi->DR);
<> 144:ef7eb2e8f9f7 289 return (int)(*p_spi_dr);
<> 144:ef7eb2e8f9f7 290 } else {
<> 144:ef7eb2e8f9f7 291 return (int)spi->DR;
<> 144:ef7eb2e8f9f7 292 }
<> 144:ef7eb2e8f9f7 293 }
<> 144:ef7eb2e8f9f7 294
<> 144:ef7eb2e8f9f7 295 static inline int ssp_busy(spi_t *obj)
<> 144:ef7eb2e8f9f7 296 {
<> 144:ef7eb2e8f9f7 297 int status;
<> 144:ef7eb2e8f9f7 298 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
<> 144:ef7eb2e8f9f7 299 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
<> 144:ef7eb2e8f9f7 300 return status;
<> 144:ef7eb2e8f9f7 301 }
<> 144:ef7eb2e8f9f7 302
<> 144:ef7eb2e8f9f7 303 int spi_master_write(spi_t *obj, int value)
<> 144:ef7eb2e8f9f7 304 {
<> 144:ef7eb2e8f9f7 305 ssp_write(obj, value);
<> 144:ef7eb2e8f9f7 306 return ssp_read(obj);
<> 144:ef7eb2e8f9f7 307 }
<> 144:ef7eb2e8f9f7 308
<> 144:ef7eb2e8f9f7 309 int spi_slave_receive(spi_t *obj)
<> 144:ef7eb2e8f9f7 310 {
<> 144:ef7eb2e8f9f7 311 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
<> 144:ef7eb2e8f9f7 312 };
<> 144:ef7eb2e8f9f7 313
<> 144:ef7eb2e8f9f7 314 int spi_slave_read(spi_t *obj)
<> 144:ef7eb2e8f9f7 315 {
<> 144:ef7eb2e8f9f7 316 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
<> 144:ef7eb2e8f9f7 317 while (!ssp_readable(obj));
<> 144:ef7eb2e8f9f7 318 if (obj->bits == SPI_DATASIZE_8BIT) {
<> 144:ef7eb2e8f9f7 319 // Force 8-bit access to the data register
<> 144:ef7eb2e8f9f7 320 uint8_t *p_spi_dr = 0;
<> 144:ef7eb2e8f9f7 321 p_spi_dr = (uint8_t *) & (spi->DR);
<> 144:ef7eb2e8f9f7 322 return (int)(*p_spi_dr);
<> 144:ef7eb2e8f9f7 323 } else {
<> 144:ef7eb2e8f9f7 324 return (int)spi->DR;
<> 144:ef7eb2e8f9f7 325 }
<> 144:ef7eb2e8f9f7 326 }
<> 144:ef7eb2e8f9f7 327
<> 144:ef7eb2e8f9f7 328 void spi_slave_write(spi_t *obj, int value)
<> 144:ef7eb2e8f9f7 329 {
<> 144:ef7eb2e8f9f7 330 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
<> 144:ef7eb2e8f9f7 331 while (!ssp_writeable(obj));
<> 144:ef7eb2e8f9f7 332 if (obj->bits == SPI_DATASIZE_8BIT) {
<> 144:ef7eb2e8f9f7 333 // Force 8-bit access to the data register
<> 144:ef7eb2e8f9f7 334 uint8_t *p_spi_dr = 0;
<> 144:ef7eb2e8f9f7 335 p_spi_dr = (uint8_t *) & (spi->DR);
<> 144:ef7eb2e8f9f7 336 *p_spi_dr = (uint8_t)value;
<> 144:ef7eb2e8f9f7 337 } else { // SPI_DATASIZE_16BIT
<> 144:ef7eb2e8f9f7 338 spi->DR = (uint16_t)value;
<> 144:ef7eb2e8f9f7 339 }
<> 144:ef7eb2e8f9f7 340 }
<> 144:ef7eb2e8f9f7 341
<> 144:ef7eb2e8f9f7 342 int spi_busy(spi_t *obj)
<> 144:ef7eb2e8f9f7 343 {
<> 144:ef7eb2e8f9f7 344 return ssp_busy(obj);
<> 144:ef7eb2e8f9f7 345 }
<> 144:ef7eb2e8f9f7 346
<> 144:ef7eb2e8f9f7 347 #endif