Ken Todotani / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_DISCO_F407VG/spi_api.c@227:7bd0639b8911, 2014-06-11 (annotated)

Committer:
mbed_official
Date:
Wed Jun 11 16:00:09 2014 +0100
Revision:
227:7bd0639b8911
Parent:
133:d4dda5c437f0
Child:
242:7074e42da0b2
Synchronized with git revision d58d532ebc0e0a96f4fffb8edefc082b71b964af



Full URL: https://github.com/mbedmicro/mbed/commit/d58d532ebc0e0a96f4fffb8edefc082b71b964af/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 133:d4dda5c437f0 1 /* mbed Microcontroller Library
mbed_official 133:d4dda5c437f0 2 *******************************************************************************
mbed_official 133:d4dda5c437f0 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 133:d4dda5c437f0 4 * All rights reserved.
mbed_official 133:d4dda5c437f0 5 *
mbed_official 133:d4dda5c437f0 6 * Redistribution and use in source and binary forms, with or without
mbed_official 133:d4dda5c437f0 7 * modification, are permitted provided that the following conditions are met:
mbed_official 133:d4dda5c437f0 8 *
mbed_official 133:d4dda5c437f0 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 133:d4dda5c437f0 10 * this list of conditions and the following disclaimer.
mbed_official 133:d4dda5c437f0 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 133:d4dda5c437f0 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 133:d4dda5c437f0 13 * and/or other materials provided with the distribution.
mbed_official 133:d4dda5c437f0 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 133:d4dda5c437f0 15 * may be used to endorse or promote products derived from this software
mbed_official 133:d4dda5c437f0 16 * without specific prior written permission.
mbed_official 133:d4dda5c437f0 17 *
mbed_official 133:d4dda5c437f0 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 133:d4dda5c437f0 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 133:d4dda5c437f0 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 133:d4dda5c437f0 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 133:d4dda5c437f0 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 133:d4dda5c437f0 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 133:d4dda5c437f0 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 133:d4dda5c437f0 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 133:d4dda5c437f0 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 133:d4dda5c437f0 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 133:d4dda5c437f0 28 *******************************************************************************
mbed_official 133:d4dda5c437f0 29 */
mbed_official 133:d4dda5c437f0 30 #include "spi_api.h"
mbed_official 133:d4dda5c437f0 31
mbed_official 133:d4dda5c437f0 32 #if DEVICE_SPI
mbed_official 133:d4dda5c437f0 33
mbed_official 133:d4dda5c437f0 34 #include <math.h>
mbed_official 133:d4dda5c437f0 35 #include "cmsis.h"
mbed_official 133:d4dda5c437f0 36 #include "pinmap.h"
mbed_official 133:d4dda5c437f0 37 #include "stm32f4xx_hal.h"
mbed_official 133:d4dda5c437f0 38
mbed_official 133:d4dda5c437f0 39 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 133:d4dda5c437f0 40 {PA_7, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 133:d4dda5c437f0 41 {PB_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 133:d4dda5c437f0 42 //{PB_5, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 133:d4dda5c437f0 43 {PB_15, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 44 {PC_3, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 45 {PC_12, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 133:d4dda5c437f0 46 {NC, NC, 0}
mbed_official 133:d4dda5c437f0 47 };
mbed_official 133:d4dda5c437f0 48
mbed_official 133:d4dda5c437f0 49 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 133:d4dda5c437f0 50 {PA_6, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 133:d4dda5c437f0 51 {PB_4, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 133:d4dda5c437f0 52 //{PB_4, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 133:d4dda5c437f0 53 {PB_14, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 54 {PC_2, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 55 {PC_11, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 133:d4dda5c437f0 56 {NC, NC, 0}
mbed_official 133:d4dda5c437f0 57 };
mbed_official 133:d4dda5c437f0 58
mbed_official 133:d4dda5c437f0 59 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 133:d4dda5c437f0 60 {PA_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 133:d4dda5c437f0 61 {PB_3, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 133:d4dda5c437f0 62 //{PB_3, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 133:d4dda5c437f0 63 {PB_10, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 64 {PB_13, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 65 {PC_10, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 133:d4dda5c437f0 66 {NC, NC, 0}
mbed_official 133:d4dda5c437f0 67 };
mbed_official 133:d4dda5c437f0 68
mbed_official 133:d4dda5c437f0 69 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 133:d4dda5c437f0 70 {PA_4, SPI_1, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF5_SPI1)},
mbed_official 133:d4dda5c437f0 71 //{PA_4, SPI_3, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF6_SPI3)},
mbed_official 133:d4dda5c437f0 72 {PA_15, SPI_1, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF5_SPI1)},
mbed_official 133:d4dda5c437f0 73 //{PA_15, SPI_3, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF6_SPI3)},
mbed_official 133:d4dda5c437f0 74 {PB_9, SPI_2, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 75 {PB_12, SPI_2, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 76 {NC, NC, 0}
mbed_official 133:d4dda5c437f0 77 };
mbed_official 133:d4dda5c437f0 78
mbed_official 133:d4dda5c437f0 79 static SPI_HandleTypeDef SpiHandle;
mbed_official 133:d4dda5c437f0 80
mbed_official 133:d4dda5c437f0 81 static void init_spi(spi_t *obj) {
mbed_official 133:d4dda5c437f0 82 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 83
mbed_official 133:d4dda5c437f0 84 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 133:d4dda5c437f0 85
mbed_official 133:d4dda5c437f0 86 SpiHandle.Init.Mode = obj->mode;
mbed_official 133:d4dda5c437f0 87 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 133:d4dda5c437f0 88 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 133:d4dda5c437f0 89 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 133:d4dda5c437f0 90 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 133:d4dda5c437f0 91 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 133:d4dda5c437f0 92 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 133:d4dda5c437f0 93 SpiHandle.Init.DataSize = obj->bits;
mbed_official 133:d4dda5c437f0 94 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 133:d4dda5c437f0 95 SpiHandle.Init.NSS = obj->nss;
mbed_official 133:d4dda5c437f0 96 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 133:d4dda5c437f0 97
mbed_official 133:d4dda5c437f0 98 HAL_SPI_Init(&SpiHandle);
mbed_official 133:d4dda5c437f0 99
mbed_official 133:d4dda5c437f0 100 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 133:d4dda5c437f0 101 }
mbed_official 133:d4dda5c437f0 102
mbed_official 133:d4dda5c437f0 103 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 133:d4dda5c437f0 104 // Determine the SPI to use
mbed_official 133:d4dda5c437f0 105 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 133:d4dda5c437f0 106 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 133:d4dda5c437f0 107 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 133:d4dda5c437f0 108 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 133:d4dda5c437f0 109
mbed_official 133:d4dda5c437f0 110 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 133:d4dda5c437f0 111 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 133:d4dda5c437f0 112
mbed_official 133:d4dda5c437f0 113 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 227:7bd0639b8911 114 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 133:d4dda5c437f0 115
mbed_official 133:d4dda5c437f0 116 // Enable SPI clock
mbed_official 133:d4dda5c437f0 117 if (obj->spi == SPI_1) {
mbed_official 133:d4dda5c437f0 118 __SPI1_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 119 }
mbed_official 133:d4dda5c437f0 120 if (obj->spi == SPI_2) {
mbed_official 133:d4dda5c437f0 121 __SPI2_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 122 }
mbed_official 133:d4dda5c437f0 123 if (obj->spi == SPI_3) {
mbed_official 133:d4dda5c437f0 124 __SPI3_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 125 }
mbed_official 133:d4dda5c437f0 126
mbed_official 133:d4dda5c437f0 127 // Configure the SPI pins
mbed_official 133:d4dda5c437f0 128 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 133:d4dda5c437f0 129 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 133:d4dda5c437f0 130 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 133:d4dda5c437f0 131
mbed_official 133:d4dda5c437f0 132 // Save new values
mbed_official 133:d4dda5c437f0 133 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 133:d4dda5c437f0 134 obj->cpol = SPI_POLARITY_LOW;
mbed_official 133:d4dda5c437f0 135 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 133:d4dda5c437f0 136 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 133:d4dda5c437f0 137
mbed_official 133:d4dda5c437f0 138 if (ssel == NC) { // SW NSS Master mode
mbed_official 133:d4dda5c437f0 139 obj->mode = SPI_MODE_MASTER;
mbed_official 133:d4dda5c437f0 140 obj->nss = SPI_NSS_SOFT;
mbed_official 133:d4dda5c437f0 141 }
mbed_official 133:d4dda5c437f0 142 else { // Slave
mbed_official 133:d4dda5c437f0 143 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 133:d4dda5c437f0 144 obj->mode = SPI_MODE_SLAVE;
mbed_official 133:d4dda5c437f0 145 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 133:d4dda5c437f0 146 }
mbed_official 133:d4dda5c437f0 147
mbed_official 133:d4dda5c437f0 148 init_spi(obj);
mbed_official 133:d4dda5c437f0 149 }
mbed_official 133:d4dda5c437f0 150
mbed_official 133:d4dda5c437f0 151 void spi_free(spi_t *obj) {
mbed_official 133:d4dda5c437f0 152 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 153 HAL_SPI_DeInit(&SpiHandle);
mbed_official 133:d4dda5c437f0 154 }
mbed_official 133:d4dda5c437f0 155
mbed_official 227:7bd0639b8911 156 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 133:d4dda5c437f0 157 // Save new values
mbed_official 133:d4dda5c437f0 158 if (bits == 8) {
mbed_official 133:d4dda5c437f0 159 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 133:d4dda5c437f0 160 }
mbed_official 133:d4dda5c437f0 161 else {
mbed_official 133:d4dda5c437f0 162 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 133:d4dda5c437f0 163 }
mbed_official 133:d4dda5c437f0 164
mbed_official 133:d4dda5c437f0 165 switch (mode) {
mbed_official 133:d4dda5c437f0 166 case 0:
mbed_official 133:d4dda5c437f0 167 obj->cpol = SPI_POLARITY_LOW;
mbed_official 133:d4dda5c437f0 168 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 133:d4dda5c437f0 169 break;
mbed_official 133:d4dda5c437f0 170 case 1:
mbed_official 133:d4dda5c437f0 171 obj->cpol = SPI_POLARITY_LOW;
mbed_official 133:d4dda5c437f0 172 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 133:d4dda5c437f0 173 break;
mbed_official 133:d4dda5c437f0 174 case 2:
mbed_official 133:d4dda5c437f0 175 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 227:7bd0639b8911 176 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 133:d4dda5c437f0 177 break;
mbed_official 133:d4dda5c437f0 178 default:
mbed_official 133:d4dda5c437f0 179 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 227:7bd0639b8911 180 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 133:d4dda5c437f0 181 break;
mbed_official 133:d4dda5c437f0 182 }
mbed_official 133:d4dda5c437f0 183
mbed_official 133:d4dda5c437f0 184 if (slave == 0) {
mbed_official 133:d4dda5c437f0 185 obj->mode = SPI_MODE_MASTER;
mbed_official 133:d4dda5c437f0 186 obj->nss = SPI_NSS_SOFT;
mbed_official 133:d4dda5c437f0 187 }
mbed_official 133:d4dda5c437f0 188 else {
mbed_official 133:d4dda5c437f0 189 obj->mode = SPI_MODE_SLAVE;
mbed_official 227:7bd0639b8911 190 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 133:d4dda5c437f0 191 }
mbed_official 133:d4dda5c437f0 192
mbed_official 133:d4dda5c437f0 193 init_spi(obj);
mbed_official 133:d4dda5c437f0 194 }
mbed_official 133:d4dda5c437f0 195
mbed_official 133:d4dda5c437f0 196 void spi_frequency(spi_t *obj, int hz) {
mbed_official 133:d4dda5c437f0 197 // Note: The frequencies are obtained with SPI1 clock = 84 MHz (APB2 clock)
mbed_official 133:d4dda5c437f0 198 if (hz < 600000) {
mbed_official 133:d4dda5c437f0 199 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 330 kHz
mbed_official 133:d4dda5c437f0 200 }
mbed_official 133:d4dda5c437f0 201 else if ((hz >= 600000) && (hz < 1000000)) {
mbed_official 133:d4dda5c437f0 202 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 656 kHz
mbed_official 133:d4dda5c437f0 203 }
mbed_official 133:d4dda5c437f0 204 else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 133:d4dda5c437f0 205 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.3 MHz
mbed_official 133:d4dda5c437f0 206 }
mbed_official 133:d4dda5c437f0 207 else if ((hz >= 2000000) && (hz < 5000000)) {
mbed_official 133:d4dda5c437f0 208 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2.6 MHz
mbed_official 133:d4dda5c437f0 209 }
mbed_official 133:d4dda5c437f0 210 else if ((hz >= 5000000) && (hz < 10000000)) {
mbed_official 133:d4dda5c437f0 211 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 5.25 MHz
mbed_official 133:d4dda5c437f0 212 }
mbed_official 133:d4dda5c437f0 213 else if ((hz >= 10000000) && (hz < 21000000)) {
mbed_official 133:d4dda5c437f0 214 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 10.5 MHz
mbed_official 133:d4dda5c437f0 215 }
mbed_official 133:d4dda5c437f0 216 else if ((hz >= 21000000) && (hz < 42000000)) {
mbed_official 133:d4dda5c437f0 217 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 21 MHz
mbed_official 133:d4dda5c437f0 218 }
mbed_official 133:d4dda5c437f0 219 else { // >= 42000000
mbed_official 133:d4dda5c437f0 220 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 42 MHz
mbed_official 133:d4dda5c437f0 221 }
mbed_official 133:d4dda5c437f0 222 init_spi(obj);
mbed_official 133:d4dda5c437f0 223 }
mbed_official 133:d4dda5c437f0 224
mbed_official 133:d4dda5c437f0 225 static inline int ssp_readable(spi_t *obj) {
mbed_official 133:d4dda5c437f0 226 int status;
mbed_official 133:d4dda5c437f0 227 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 228 // Check if data is received
mbed_official 133:d4dda5c437f0 229 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 227:7bd0639b8911 230 return status;
mbed_official 133:d4dda5c437f0 231 }
mbed_official 133:d4dda5c437f0 232
mbed_official 133:d4dda5c437f0 233 static inline int ssp_writeable(spi_t *obj) {
mbed_official 133:d4dda5c437f0 234 int status;
mbed_official 133:d4dda5c437f0 235 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 236 // Check if data is transmitted
mbed_official 133:d4dda5c437f0 237 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 133:d4dda5c437f0 238 return status;
mbed_official 133:d4dda5c437f0 239 }
mbed_official 133:d4dda5c437f0 240
mbed_official 133:d4dda5c437f0 241 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 133:d4dda5c437f0 242 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 243 while (!ssp_writeable(obj));
mbed_official 133:d4dda5c437f0 244 spi->DR = (uint16_t)value;
mbed_official 133:d4dda5c437f0 245 }
mbed_official 133:d4dda5c437f0 246
mbed_official 133:d4dda5c437f0 247 static inline int ssp_read(spi_t *obj) {
mbed_official 133:d4dda5c437f0 248 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 249 while (!ssp_readable(obj));
mbed_official 133:d4dda5c437f0 250 return (int)spi->DR;
mbed_official 133:d4dda5c437f0 251 }
mbed_official 133:d4dda5c437f0 252
mbed_official 133:d4dda5c437f0 253 static inline int ssp_busy(spi_t *obj) {
mbed_official 133:d4dda5c437f0 254 int status;
mbed_official 133:d4dda5c437f0 255 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 256 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 133:d4dda5c437f0 257 return status;
mbed_official 133:d4dda5c437f0 258 }
mbed_official 133:d4dda5c437f0 259
mbed_official 133:d4dda5c437f0 260 int spi_master_write(spi_t *obj, int value) {
mbed_official 133:d4dda5c437f0 261 ssp_write(obj, value);
mbed_official 133:d4dda5c437f0 262 return ssp_read(obj);
mbed_official 133:d4dda5c437f0 263 }
mbed_official 133:d4dda5c437f0 264
mbed_official 133:d4dda5c437f0 265 int spi_slave_receive(spi_t *obj) {
mbed_official 133:d4dda5c437f0 266 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 133:d4dda5c437f0 267 };
mbed_official 133:d4dda5c437f0 268
mbed_official 133:d4dda5c437f0 269 int spi_slave_read(spi_t *obj) {
mbed_official 133:d4dda5c437f0 270 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 271 return (int)spi->DR;
mbed_official 133:d4dda5c437f0 272 }
mbed_official 133:d4dda5c437f0 273
mbed_official 133:d4dda5c437f0 274 void spi_slave_write(spi_t *obj, int value) {
mbed_official 133:d4dda5c437f0 275 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 276 while (!ssp_writeable(obj));
mbed_official 133:d4dda5c437f0 277 spi->DR = (uint16_t)value;
mbed_official 133:d4dda5c437f0 278 }
mbed_official 133:d4dda5c437f0 279
mbed_official 133:d4dda5c437f0 280 int spi_busy(spi_t *obj) {
mbed_official 133:d4dda5c437f0 281 return ssp_busy(obj);
mbed_official 133:d4dda5c437f0 282 }
mbed_official 133:d4dda5c437f0 283
mbed_official 133:d4dda5c437f0 284 #endif