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Dependents:   SPI_slave_frdm

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F303RE/spi_api.c@500:222d8913df56, 2015-04-01 (annotated)

Committer:
armdran
Date:
Wed Apr 01 09:08:17 2015 +0000
Revision:
500:222d8913df56
Parent:
423:560d1a9f3083 
debugt output addded

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 423:560d1a9f3083 1 /* mbed Microcontroller Library
mbed_official 423:560d1a9f3083 2 *******************************************************************************
mbed_official 423:560d1a9f3083 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 423:560d1a9f3083 4 * All rights reserved.
mbed_official 423:560d1a9f3083 5 *
mbed_official 423:560d1a9f3083 6 * Redistribution and use in source and binary forms, with or without
mbed_official 423:560d1a9f3083 7 * modification, are permitted provided that the following conditions are met:
mbed_official 423:560d1a9f3083 8 *
mbed_official 423:560d1a9f3083 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 423:560d1a9f3083 10 * this list of conditions and the following disclaimer.
mbed_official 423:560d1a9f3083 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 423:560d1a9f3083 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 423:560d1a9f3083 13 * and/or other materials provided with the distribution.
mbed_official 423:560d1a9f3083 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 423:560d1a9f3083 15 * may be used to endorse or promote products derived from this software
mbed_official 423:560d1a9f3083 16 * without specific prior written permission.
mbed_official 423:560d1a9f3083 17 *
mbed_official 423:560d1a9f3083 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 423:560d1a9f3083 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 423:560d1a9f3083 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 423:560d1a9f3083 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 423:560d1a9f3083 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 423:560d1a9f3083 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 423:560d1a9f3083 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 423:560d1a9f3083 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 423:560d1a9f3083 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 423:560d1a9f3083 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 423:560d1a9f3083 28 *******************************************************************************
mbed_official 423:560d1a9f3083 29 */
mbed_official 423:560d1a9f3083 30 #include "mbed_assert.h"
mbed_official 423:560d1a9f3083 31 #include "spi_api.h"
mbed_official 423:560d1a9f3083 32
mbed_official 423:560d1a9f3083 33 #if DEVICE_SPI
mbed_official 423:560d1a9f3083 34
mbed_official 423:560d1a9f3083 35 #include <math.h>
mbed_official 423:560d1a9f3083 36 #include "cmsis.h"
mbed_official 423:560d1a9f3083 37 #include "pinmap.h"
mbed_official 423:560d1a9f3083 38 #include "PeripheralPins.h"
mbed_official 423:560d1a9f3083 39
mbed_official 423:560d1a9f3083 40 static SPI_HandleTypeDef SpiHandle;
mbed_official 423:560d1a9f3083 41
mbed_official 423:560d1a9f3083 42 static void init_spi(spi_t *obj)
mbed_official 423:560d1a9f3083 43 {
mbed_official 423:560d1a9f3083 44 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 423:560d1a9f3083 45
mbed_official 423:560d1a9f3083 46 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 423:560d1a9f3083 47
mbed_official 423:560d1a9f3083 48 SpiHandle.Init.Mode = obj->mode;
mbed_official 423:560d1a9f3083 49 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 423:560d1a9f3083 50 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 423:560d1a9f3083 51 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 423:560d1a9f3083 52 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 423:560d1a9f3083 53 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 423:560d1a9f3083 54 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 423:560d1a9f3083 55 SpiHandle.Init.DataSize = obj->bits;
mbed_official 423:560d1a9f3083 56 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 423:560d1a9f3083 57 SpiHandle.Init.NSS = obj->nss;
mbed_official 423:560d1a9f3083 58 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 423:560d1a9f3083 59
mbed_official 423:560d1a9f3083 60 HAL_SPI_Init(&SpiHandle);
mbed_official 423:560d1a9f3083 61
mbed_official 423:560d1a9f3083 62 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 423:560d1a9f3083 63 }
mbed_official 423:560d1a9f3083 64
mbed_official 423:560d1a9f3083 65 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 423:560d1a9f3083 66 {
mbed_official 423:560d1a9f3083 67 // Determine the SPI to use
mbed_official 423:560d1a9f3083 68 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 423:560d1a9f3083 69 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 423:560d1a9f3083 70 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 423:560d1a9f3083 71 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 423:560d1a9f3083 72
mbed_official 423:560d1a9f3083 73 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 423:560d1a9f3083 74 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 423:560d1a9f3083 75
mbed_official 423:560d1a9f3083 76 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 423:560d1a9f3083 77 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 423:560d1a9f3083 78
mbed_official 423:560d1a9f3083 79 // Enable SPI clock
mbed_official 423:560d1a9f3083 80 if (obj->spi == SPI_1) {
mbed_official 423:560d1a9f3083 81 __SPI1_CLK_ENABLE();
mbed_official 423:560d1a9f3083 82 }
mbed_official 423:560d1a9f3083 83
mbed_official 423:560d1a9f3083 84 if (obj->spi == SPI_2) {
mbed_official 423:560d1a9f3083 85 __SPI2_CLK_ENABLE();
mbed_official 423:560d1a9f3083 86 }
mbed_official 423:560d1a9f3083 87
mbed_official 423:560d1a9f3083 88 if (obj->spi == SPI_3) {
mbed_official 423:560d1a9f3083 89 __SPI3_CLK_ENABLE();
mbed_official 423:560d1a9f3083 90 }
mbed_official 423:560d1a9f3083 91
mbed_official 423:560d1a9f3083 92 // Configure the SPI pins
mbed_official 423:560d1a9f3083 93 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 423:560d1a9f3083 94 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 423:560d1a9f3083 95 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 423:560d1a9f3083 96
mbed_official 423:560d1a9f3083 97 // Save new values
mbed_official 423:560d1a9f3083 98 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 423:560d1a9f3083 99 obj->cpol = SPI_POLARITY_LOW;
mbed_official 423:560d1a9f3083 100 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 423:560d1a9f3083 101 obj->br_presc = SPI_BAUDRATEPRESCALER_32;
mbed_official 423:560d1a9f3083 102
mbed_official 423:560d1a9f3083 103 obj->pin_miso = miso;
mbed_official 423:560d1a9f3083 104 obj->pin_mosi = mosi;
mbed_official 423:560d1a9f3083 105 obj->pin_sclk = sclk;
mbed_official 423:560d1a9f3083 106 obj->pin_ssel = ssel;
mbed_official 423:560d1a9f3083 107
mbed_official 423:560d1a9f3083 108 if (ssel == NC) { // SW NSS Master mode
mbed_official 423:560d1a9f3083 109 obj->mode = SPI_MODE_MASTER;
mbed_official 423:560d1a9f3083 110 obj->nss = SPI_NSS_SOFT;
mbed_official 423:560d1a9f3083 111 } else { // Slave
mbed_official 423:560d1a9f3083 112 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 423:560d1a9f3083 113 obj->mode = SPI_MODE_SLAVE;
mbed_official 423:560d1a9f3083 114 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 423:560d1a9f3083 115 }
mbed_official 423:560d1a9f3083 116
mbed_official 423:560d1a9f3083 117 init_spi(obj);
mbed_official 423:560d1a9f3083 118 }
mbed_official 423:560d1a9f3083 119
mbed_official 423:560d1a9f3083 120 void spi_free(spi_t *obj)
mbed_official 423:560d1a9f3083 121 {
mbed_official 423:560d1a9f3083 122 // Reset SPI and disable clock
mbed_official 423:560d1a9f3083 123 if (obj->spi == SPI_1) {
mbed_official 423:560d1a9f3083 124 __SPI1_FORCE_RESET();
mbed_official 423:560d1a9f3083 125 __SPI1_RELEASE_RESET();
mbed_official 423:560d1a9f3083 126 __SPI1_CLK_DISABLE();
mbed_official 423:560d1a9f3083 127 }
mbed_official 423:560d1a9f3083 128
mbed_official 423:560d1a9f3083 129 if (obj->spi == SPI_2) {
mbed_official 423:560d1a9f3083 130 __SPI2_FORCE_RESET();
mbed_official 423:560d1a9f3083 131 __SPI2_RELEASE_RESET();
mbed_official 423:560d1a9f3083 132 __SPI2_CLK_DISABLE();
mbed_official 423:560d1a9f3083 133 }
mbed_official 423:560d1a9f3083 134
mbed_official 423:560d1a9f3083 135 if (obj->spi == SPI_3) {
mbed_official 423:560d1a9f3083 136 __SPI3_FORCE_RESET();
mbed_official 423:560d1a9f3083 137 __SPI3_RELEASE_RESET();
mbed_official 423:560d1a9f3083 138 __SPI3_CLK_DISABLE();
mbed_official 423:560d1a9f3083 139 }
mbed_official 423:560d1a9f3083 140
mbed_official 423:560d1a9f3083 141 // Configure GPIOs
mbed_official 423:560d1a9f3083 142 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 423:560d1a9f3083 143 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 423:560d1a9f3083 144 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 423:560d1a9f3083 145 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 423:560d1a9f3083 146 }
mbed_official 423:560d1a9f3083 147
mbed_official 423:560d1a9f3083 148 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 423:560d1a9f3083 149 {
mbed_official 423:560d1a9f3083 150 // Save new values
mbed_official 423:560d1a9f3083 151 if (bits == 16) {
mbed_official 423:560d1a9f3083 152 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 423:560d1a9f3083 153 } else {
mbed_official 423:560d1a9f3083 154 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 423:560d1a9f3083 155 }
mbed_official 423:560d1a9f3083 156
mbed_official 423:560d1a9f3083 157 switch (mode) {
mbed_official 423:560d1a9f3083 158 case 0:
mbed_official 423:560d1a9f3083 159 obj->cpol = SPI_POLARITY_LOW;
mbed_official 423:560d1a9f3083 160 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 423:560d1a9f3083 161 break;
mbed_official 423:560d1a9f3083 162 case 1:
mbed_official 423:560d1a9f3083 163 obj->cpol = SPI_POLARITY_LOW;
mbed_official 423:560d1a9f3083 164 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 423:560d1a9f3083 165 break;
mbed_official 423:560d1a9f3083 166 case 2:
mbed_official 423:560d1a9f3083 167 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 423:560d1a9f3083 168 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 423:560d1a9f3083 169 break;
mbed_official 423:560d1a9f3083 170 default:
mbed_official 423:560d1a9f3083 171 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 423:560d1a9f3083 172 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 423:560d1a9f3083 173 break;
mbed_official 423:560d1a9f3083 174 }
mbed_official 423:560d1a9f3083 175
mbed_official 423:560d1a9f3083 176 if (slave == 0) {
mbed_official 423:560d1a9f3083 177 obj->mode = SPI_MODE_MASTER;
mbed_official 423:560d1a9f3083 178 obj->nss = SPI_NSS_SOFT;
mbed_official 423:560d1a9f3083 179 } else {
mbed_official 423:560d1a9f3083 180 obj->mode = SPI_MODE_SLAVE;
mbed_official 423:560d1a9f3083 181 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 423:560d1a9f3083 182 }
mbed_official 423:560d1a9f3083 183
mbed_official 423:560d1a9f3083 184 init_spi(obj);
mbed_official 423:560d1a9f3083 185 }
mbed_official 423:560d1a9f3083 186
mbed_official 423:560d1a9f3083 187 void spi_frequency(spi_t *obj, int hz)
mbed_official 423:560d1a9f3083 188 {
mbed_official 423:560d1a9f3083 189 // Values depend of APB1CLK and APB2CLK : 32 MHz if HSI is used, 36 MHz if HSE is used
mbed_official 423:560d1a9f3083 190 if (obj->spi == SPI_1) {
mbed_official 423:560d1a9f3083 191 if (hz < 500000) {
mbed_official 423:560d1a9f3083 192 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 250 kHz - 280 kHz
mbed_official 423:560d1a9f3083 193 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 423:560d1a9f3083 194 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 500 kHz - 560 kHz
mbed_official 423:560d1a9f3083 195 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 423:560d1a9f3083 196 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1 MHz - 1.13 MHz
mbed_official 423:560d1a9f3083 197 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 423:560d1a9f3083 198 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2 MHz - 2.25 MHz
mbed_official 423:560d1a9f3083 199 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 423:560d1a9f3083 200 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 4 MHz - 4.5 MHz
mbed_official 423:560d1a9f3083 201 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 423:560d1a9f3083 202 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 8 MHz - 9 MHz
mbed_official 423:560d1a9f3083 203 } else if ((hz >= 16000000) && (hz < 32000000)) {
mbed_official 423:560d1a9f3083 204 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 16 MHz - 18 MHz
mbed_official 423:560d1a9f3083 205 } else { // >= 32000000
mbed_official 423:560d1a9f3083 206 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 32 MHz - 36 MHz
mbed_official 423:560d1a9f3083 207 }
mbed_official 423:560d1a9f3083 208 } else {
mbed_official 423:560d1a9f3083 209 if (hz < 250000) {
mbed_official 423:560d1a9f3083 210 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 125 kHz - 141 kHz
mbed_official 423:560d1a9f3083 211 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 423:560d1a9f3083 212 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 250 kHz - 280 kHz
mbed_official 423:560d1a9f3083 213 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 423:560d1a9f3083 214 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 500 kHz - 560 kHz
mbed_official 423:560d1a9f3083 215 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 423:560d1a9f3083 216 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz - 1.13 MHz
mbed_official 423:560d1a9f3083 217 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 423:560d1a9f3083 218 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2 MHz - 2.25 MHz
mbed_official 423:560d1a9f3083 219 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 423:560d1a9f3083 220 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 4 MHz - 4.5 MHz
mbed_official 423:560d1a9f3083 221 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 423:560d1a9f3083 222 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 8 MHz - 9 MHz
mbed_official 423:560d1a9f3083 223 } else { // >= 16000000
mbed_official 423:560d1a9f3083 224 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 16 MHz - 18 MHz
mbed_official 423:560d1a9f3083 225 }
mbed_official 423:560d1a9f3083 226 }
mbed_official 423:560d1a9f3083 227
mbed_official 423:560d1a9f3083 228 init_spi(obj);
mbed_official 423:560d1a9f3083 229 }
mbed_official 423:560d1a9f3083 230
mbed_official 423:560d1a9f3083 231 static inline int ssp_readable(spi_t *obj)
mbed_official 423:560d1a9f3083 232 {
mbed_official 423:560d1a9f3083 233 int status;
mbed_official 423:560d1a9f3083 234 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 423:560d1a9f3083 235 // Check if data is received
mbed_official 423:560d1a9f3083 236 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 423:560d1a9f3083 237 return status;
mbed_official 423:560d1a9f3083 238 }
mbed_official 423:560d1a9f3083 239
mbed_official 423:560d1a9f3083 240 static inline int ssp_writeable(spi_t *obj)
mbed_official 423:560d1a9f3083 241 {
mbed_official 423:560d1a9f3083 242 int status;
mbed_official 423:560d1a9f3083 243 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 423:560d1a9f3083 244 // Check if data is transmitted
mbed_official 423:560d1a9f3083 245 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 423:560d1a9f3083 246 return status;
mbed_official 423:560d1a9f3083 247 }
mbed_official 423:560d1a9f3083 248
mbed_official 423:560d1a9f3083 249 static inline void ssp_write(spi_t *obj, int value)
mbed_official 423:560d1a9f3083 250 {
mbed_official 423:560d1a9f3083 251 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 423:560d1a9f3083 252 while (!ssp_writeable(obj));
mbed_official 423:560d1a9f3083 253 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 423:560d1a9f3083 254 // Force 8-bit access to the data register
mbed_official 423:560d1a9f3083 255 uint8_t *p_spi_dr = 0;
mbed_official 423:560d1a9f3083 256 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 423:560d1a9f3083 257 *p_spi_dr = (uint8_t)value;
mbed_official 423:560d1a9f3083 258 } else { // SPI_DATASIZE_16BIT
mbed_official 423:560d1a9f3083 259 spi->DR = (uint16_t)value;
mbed_official 423:560d1a9f3083 260 }
mbed_official 423:560d1a9f3083 261 }
mbed_official 423:560d1a9f3083 262
mbed_official 423:560d1a9f3083 263 static inline int ssp_read(spi_t *obj)
mbed_official 423:560d1a9f3083 264 {
mbed_official 423:560d1a9f3083 265 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 423:560d1a9f3083 266 while (!ssp_readable(obj));
mbed_official 423:560d1a9f3083 267 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 423:560d1a9f3083 268 // Force 8-bit access to the data register
mbed_official 423:560d1a9f3083 269 uint8_t *p_spi_dr = 0;
mbed_official 423:560d1a9f3083 270 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 423:560d1a9f3083 271 return (int)(*p_spi_dr);
mbed_official 423:560d1a9f3083 272 } else {
mbed_official 423:560d1a9f3083 273 return (int)spi->DR;
mbed_official 423:560d1a9f3083 274 }
mbed_official 423:560d1a9f3083 275 }
mbed_official 423:560d1a9f3083 276
mbed_official 423:560d1a9f3083 277 static inline int ssp_busy(spi_t *obj)
mbed_official 423:560d1a9f3083 278 {
mbed_official 423:560d1a9f3083 279 int status;
mbed_official 423:560d1a9f3083 280 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 423:560d1a9f3083 281 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 423:560d1a9f3083 282 return status;
mbed_official 423:560d1a9f3083 283 }
mbed_official 423:560d1a9f3083 284
mbed_official 423:560d1a9f3083 285 int spi_master_write(spi_t *obj, int value)
mbed_official 423:560d1a9f3083 286 {
mbed_official 423:560d1a9f3083 287 ssp_write(obj, value);
mbed_official 423:560d1a9f3083 288 return ssp_read(obj);
mbed_official 423:560d1a9f3083 289 }
mbed_official 423:560d1a9f3083 290
mbed_official 423:560d1a9f3083 291 int spi_slave_receive(spi_t *obj)
mbed_official 423:560d1a9f3083 292 {
mbed_official 423:560d1a9f3083 293 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 423:560d1a9f3083 294 };
mbed_official 423:560d1a9f3083 295
mbed_official 423:560d1a9f3083 296 int spi_slave_read(spi_t *obj)
mbed_official 423:560d1a9f3083 297 {
mbed_official 423:560d1a9f3083 298 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 423:560d1a9f3083 299 while (!ssp_readable(obj));
mbed_official 423:560d1a9f3083 300 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 423:560d1a9f3083 301 // Force 8-bit access to the data register
mbed_official 423:560d1a9f3083 302 uint8_t *p_spi_dr = 0;
mbed_official 423:560d1a9f3083 303 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 423:560d1a9f3083 304 return (int)(*p_spi_dr);
mbed_official 423:560d1a9f3083 305 } else {
mbed_official 423:560d1a9f3083 306 return (int)spi->DR;
mbed_official 423:560d1a9f3083 307 }
mbed_official 423:560d1a9f3083 308 }
mbed_official 423:560d1a9f3083 309
mbed_official 423:560d1a9f3083 310 void spi_slave_write(spi_t *obj, int value)
mbed_official 423:560d1a9f3083 311 {
mbed_official 423:560d1a9f3083 312 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 423:560d1a9f3083 313 while (!ssp_writeable(obj));
mbed_official 423:560d1a9f3083 314 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 423:560d1a9f3083 315 // Force 8-bit access to the data register
mbed_official 423:560d1a9f3083 316 uint8_t *p_spi_dr = 0;
mbed_official 423:560d1a9f3083 317 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 423:560d1a9f3083 318 *p_spi_dr = (uint8_t)value;
mbed_official 423:560d1a9f3083 319 } else { // SPI_DATASIZE_16BIT
mbed_official 423:560d1a9f3083 320 spi->DR = (uint16_t)value;
mbed_official 423:560d1a9f3083 321 }
mbed_official 423:560d1a9f3083 322 }
mbed_official 423:560d1a9f3083 323
mbed_official 423:560d1a9f3083 324 int spi_busy(spi_t *obj)
mbed_official 423:560d1a9f3083 325 {
mbed_official 423:560d1a9f3083 326 return ssp_busy(obj);
mbed_official 423:560d1a9f3083 327 }
mbed_official 423:560d1a9f3083 328
mbed_official 423:560d1a9f3083 329 #endif