long dao / mbed-src

Mbed for VNG board

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F030R8/spi_api.c@404:cbc7dfcb0ce9, 2014-11-14 (annotated)

Committer:
mbed_official
Date:
Fri Nov 14 10:15:07 2014 +0000
Revision:
404:cbc7dfcb0ce9
Parent:
402:09075a3b15e3
Child:
414:4ec4c5b614b0
Synchronized with git revision c4901dbb33541e1dcda3fe69a1ec2a11caf496bf



Full URL: https://github.com/mbedmicro/mbed/commit/c4901dbb33541e1dcda3fe69a1ec2a11caf496bf/



Targets: NUCLEOs - Align hal files

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 84:f54042cbc282 1 /* mbed Microcontroller Library
mbed_official 84:f54042cbc282 2 *******************************************************************************
mbed_official 84:f54042cbc282 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 84:f54042cbc282 4 * All rights reserved.
mbed_official 84:f54042cbc282 5 *
mbed_official 84:f54042cbc282 6 * Redistribution and use in source and binary forms, with or without
mbed_official 84:f54042cbc282 7 * modification, are permitted provided that the following conditions are met:
mbed_official 84:f54042cbc282 8 *
mbed_official 84:f54042cbc282 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 84:f54042cbc282 10 * this list of conditions and the following disclaimer.
mbed_official 84:f54042cbc282 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 84:f54042cbc282 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 84:f54042cbc282 13 * and/or other materials provided with the distribution.
mbed_official 84:f54042cbc282 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 84:f54042cbc282 15 * may be used to endorse or promote products derived from this software
mbed_official 84:f54042cbc282 16 * without specific prior written permission.
mbed_official 84:f54042cbc282 17 *
mbed_official 84:f54042cbc282 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 84:f54042cbc282 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 84:f54042cbc282 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 84:f54042cbc282 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 84:f54042cbc282 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 84:f54042cbc282 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 84:f54042cbc282 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 84:f54042cbc282 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 84:f54042cbc282 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 84:f54042cbc282 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 84:f54042cbc282 28 *******************************************************************************
mbed_official 84:f54042cbc282 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 84:f54042cbc282 31 #include "spi_api.h"
mbed_official 84:f54042cbc282 32
mbed_official 84:f54042cbc282 33 #if DEVICE_SPI
mbed_official 84:f54042cbc282 34
mbed_official 84:f54042cbc282 35 #include <math.h>
mbed_official 84:f54042cbc282 36 #include "cmsis.h"
mbed_official 84:f54042cbc282 37 #include "pinmap.h"
mbed_official 84:f54042cbc282 38
mbed_official 84:f54042cbc282 39 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 340:28d1f895c6fe 40 {PA_7, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF0_SPI1)},
mbed_official 340:28d1f895c6fe 41 {PB_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF0_SPI1)},
mbed_official 340:28d1f895c6fe 42 {PB_15, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF0_SPI2)},
mbed_official 84:f54042cbc282 43 {NC, NC, 0}
mbed_official 84:f54042cbc282 44 };
mbed_official 84:f54042cbc282 45
mbed_official 84:f54042cbc282 46 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 340:28d1f895c6fe 47 {PA_6, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF0_SPI1)},
mbed_official 340:28d1f895c6fe 48 {PB_4, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF0_SPI1)},
mbed_official 340:28d1f895c6fe 49 {PB_14, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF0_SPI2)},
mbed_official 84:f54042cbc282 50 {NC, NC, 0}
mbed_official 84:f54042cbc282 51 };
mbed_official 84:f54042cbc282 52
mbed_official 84:f54042cbc282 53 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 340:28d1f895c6fe 54 {PA_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF0_SPI1)},
mbed_official 340:28d1f895c6fe 55 {PB_3, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF0_SPI1)},
mbed_official 340:28d1f895c6fe 56 {PB_13, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLDOWN, GPIO_AF0_SPI2)},
mbed_official 84:f54042cbc282 57 {NC, NC, 0}
mbed_official 84:f54042cbc282 58 };
mbed_official 84:f54042cbc282 59
mbed_official 84:f54042cbc282 60 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 340:28d1f895c6fe 61 {PA_4, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF0_SPI1)},
mbed_official 340:28d1f895c6fe 62 {PA_15, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF0_SPI1)},
mbed_official 340:28d1f895c6fe 63 {PB_12, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF0_SPI2)},
mbed_official 84:f54042cbc282 64 {NC, NC, 0}
mbed_official 84:f54042cbc282 65 };
mbed_official 84:f54042cbc282 66
mbed_official 340:28d1f895c6fe 67 static SPI_HandleTypeDef SpiHandle;
mbed_official 340:28d1f895c6fe 68
mbed_official 402:09075a3b15e3 69 static void init_spi(spi_t *obj)
mbed_official 402:09075a3b15e3 70 {
mbed_official 340:28d1f895c6fe 71 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 84:f54042cbc282 72
mbed_official 340:28d1f895c6fe 73 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 84:f54042cbc282 74
mbed_official 340:28d1f895c6fe 75 SpiHandle.Init.Mode = obj->mode;
mbed_official 340:28d1f895c6fe 76 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 340:28d1f895c6fe 77 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 340:28d1f895c6fe 78 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 340:28d1f895c6fe 79 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 340:28d1f895c6fe 80 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 340:28d1f895c6fe 81 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 340:28d1f895c6fe 82 SpiHandle.Init.DataSize = obj->bits;
mbed_official 340:28d1f895c6fe 83 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 340:28d1f895c6fe 84 SpiHandle.Init.NSS = obj->nss;
mbed_official 340:28d1f895c6fe 85 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 84:f54042cbc282 86
mbed_official 340:28d1f895c6fe 87 HAL_SPI_Init(&SpiHandle);
mbed_official 84:f54042cbc282 88
mbed_official 340:28d1f895c6fe 89 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 84:f54042cbc282 90 }
mbed_official 84:f54042cbc282 91
mbed_official 402:09075a3b15e3 92 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 402:09075a3b15e3 93 {
mbed_official 84:f54042cbc282 94 // Determine the SPI to use
mbed_official 84:f54042cbc282 95 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 84:f54042cbc282 96 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 84:f54042cbc282 97 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 84:f54042cbc282 98 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 216:577900467c9e 99
mbed_official 84:f54042cbc282 100 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 84:f54042cbc282 101 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 216:577900467c9e 102
mbed_official 84:f54042cbc282 103 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 227:7bd0639b8911 104 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 216:577900467c9e 105
mbed_official 84:f54042cbc282 106 // Enable SPI clock
mbed_official 84:f54042cbc282 107 if (obj->spi == SPI_1) {
mbed_official 340:28d1f895c6fe 108 __SPI1_CLK_ENABLE();
mbed_official 84:f54042cbc282 109 }
mbed_official 84:f54042cbc282 110 if (obj->spi == SPI_2) {
mbed_official 340:28d1f895c6fe 111 __SPI2_CLK_ENABLE();
mbed_official 84:f54042cbc282 112 }
mbed_official 216:577900467c9e 113
mbed_official 84:f54042cbc282 114 // Configure the SPI pins
mbed_official 84:f54042cbc282 115 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 84:f54042cbc282 116 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 84:f54042cbc282 117 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 216:577900467c9e 118
mbed_official 84:f54042cbc282 119 // Save new values
mbed_official 340:28d1f895c6fe 120 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 340:28d1f895c6fe 121 obj->cpol = SPI_POLARITY_LOW;
mbed_official 340:28d1f895c6fe 122 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 340:28d1f895c6fe 123 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 216:577900467c9e 124
mbed_official 216:577900467c9e 125 obj->pin_miso = miso;
mbed_official 216:577900467c9e 126 obj->pin_mosi = mosi;
mbed_official 216:577900467c9e 127 obj->pin_sclk = sclk;
mbed_official 216:577900467c9e 128 obj->pin_ssel = ssel;
mbed_official 216:577900467c9e 129
mbed_official 340:28d1f895c6fe 130 if (ssel == NC) { // SW NSS Master mode
mbed_official 340:28d1f895c6fe 131 obj->mode = SPI_MODE_MASTER;
mbed_official 340:28d1f895c6fe 132 obj->nss = SPI_NSS_SOFT;
mbed_official 216:577900467c9e 133 } else { // Slave
mbed_official 84:f54042cbc282 134 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 340:28d1f895c6fe 135 obj->mode = SPI_MODE_SLAVE;
mbed_official 340:28d1f895c6fe 136 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 84:f54042cbc282 137 }
mbed_official 84:f54042cbc282 138
mbed_official 84:f54042cbc282 139 init_spi(obj);
mbed_official 84:f54042cbc282 140 }
mbed_official 84:f54042cbc282 141
mbed_official 402:09075a3b15e3 142 void spi_free(spi_t *obj)
mbed_official 402:09075a3b15e3 143 {
mbed_official 216:577900467c9e 144 // Reset SPI and disable clock
mbed_official 216:577900467c9e 145 if (obj->spi == SPI_1) {
mbed_official 340:28d1f895c6fe 146 __SPI1_FORCE_RESET();
mbed_official 340:28d1f895c6fe 147 __SPI1_RELEASE_RESET();
mbed_official 340:28d1f895c6fe 148 __SPI1_CLK_DISABLE();
mbed_official 216:577900467c9e 149 }
mbed_official 216:577900467c9e 150
mbed_official 216:577900467c9e 151 if (obj->spi == SPI_2) {
mbed_official 340:28d1f895c6fe 152 __SPI2_FORCE_RESET();
mbed_official 340:28d1f895c6fe 153 __SPI2_RELEASE_RESET();
mbed_official 340:28d1f895c6fe 154 __SPI2_CLK_DISABLE();
mbed_official 216:577900467c9e 155 }
mbed_official 216:577900467c9e 156
mbed_official 404:cbc7dfcb0ce9 157 // Configure GPIOs
mbed_official 340:28d1f895c6fe 158 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 340:28d1f895c6fe 159 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 340:28d1f895c6fe 160 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 340:28d1f895c6fe 161 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 84:f54042cbc282 162 }
mbed_official 84:f54042cbc282 163
mbed_official 402:09075a3b15e3 164 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 402:09075a3b15e3 165 {
mbed_official 84:f54042cbc282 166 // Save new values
mbed_official 233:1bbc1451db33 167 if (bits == 16) {
mbed_official 340:28d1f895c6fe 168 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 233:1bbc1451db33 169 } else {
mbed_official 340:28d1f895c6fe 170 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 84:f54042cbc282 171 }
mbed_official 216:577900467c9e 172
mbed_official 84:f54042cbc282 173 switch (mode) {
mbed_official 84:f54042cbc282 174 case 0:
mbed_official 340:28d1f895c6fe 175 obj->cpol = SPI_POLARITY_LOW;
mbed_official 340:28d1f895c6fe 176 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 216:577900467c9e 177 break;
mbed_official 84:f54042cbc282 178 case 1:
mbed_official 340:28d1f895c6fe 179 obj->cpol = SPI_POLARITY_LOW;
mbed_official 340:28d1f895c6fe 180 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 216:577900467c9e 181 break;
mbed_official 84:f54042cbc282 182 case 2:
mbed_official 340:28d1f895c6fe 183 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 340:28d1f895c6fe 184 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 216:577900467c9e 185 break;
mbed_official 84:f54042cbc282 186 default:
mbed_official 340:28d1f895c6fe 187 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 340:28d1f895c6fe 188 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 216:577900467c9e 189 break;
mbed_official 84:f54042cbc282 190 }
mbed_official 216:577900467c9e 191
mbed_official 84:f54042cbc282 192 if (slave == 0) {
mbed_official 340:28d1f895c6fe 193 obj->mode = SPI_MODE_MASTER;
mbed_official 340:28d1f895c6fe 194 obj->nss = SPI_NSS_SOFT;
mbed_official 216:577900467c9e 195 } else {
mbed_official 340:28d1f895c6fe 196 obj->mode = SPI_MODE_SLAVE;
mbed_official 340:28d1f895c6fe 197 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 84:f54042cbc282 198 }
mbed_official 216:577900467c9e 199
mbed_official 84:f54042cbc282 200 init_spi(obj);
mbed_official 84:f54042cbc282 201 }
mbed_official 84:f54042cbc282 202
mbed_official 402:09075a3b15e3 203 void spi_frequency(spi_t *obj, int hz)
mbed_official 402:09075a3b15e3 204 {
mbed_official 340:28d1f895c6fe 205 // Note: The frequencies are obtained with SPI clock = 48 MHz (APB clock)
mbed_official 340:28d1f895c6fe 206 if (hz < 375000) {
mbed_official 340:28d1f895c6fe 207 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 188 kHz
mbed_official 340:28d1f895c6fe 208 } else if ((hz >= 375000) && (hz < 750000)) {
mbed_official 340:28d1f895c6fe 209 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
mbed_official 340:28d1f895c6fe 210 } else if ((hz >= 750000) && (hz < 1000000)) {
mbed_official 340:28d1f895c6fe 211 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 750 kHz
mbed_official 216:577900467c9e 212 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 340:28d1f895c6fe 213 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz
mbed_official 216:577900467c9e 214 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 340:28d1f895c6fe 215 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
mbed_official 216:577900467c9e 216 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 340:28d1f895c6fe 217 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
mbed_official 216:577900467c9e 218 } else if ((hz >= 12000000) && (hz < 24000000)) {
mbed_official 340:28d1f895c6fe 219 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
mbed_official 216:577900467c9e 220 } else { // >= 24000000
mbed_official 340:28d1f895c6fe 221 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
mbed_official 166:cb4253f91ada 222 }
mbed_official 404:cbc7dfcb0ce9 223
mbed_official 84:f54042cbc282 224 init_spi(obj);
mbed_official 84:f54042cbc282 225 }
mbed_official 84:f54042cbc282 226
mbed_official 402:09075a3b15e3 227 static inline int ssp_readable(spi_t *obj)
mbed_official 402:09075a3b15e3 228 {
mbed_official 84:f54042cbc282 229 int status;
mbed_official 340:28d1f895c6fe 230 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 84:f54042cbc282 231 // Check if data is received
mbed_official 340:28d1f895c6fe 232 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 216:577900467c9e 233 return status;
mbed_official 84:f54042cbc282 234 }
mbed_official 84:f54042cbc282 235
mbed_official 402:09075a3b15e3 236 static inline int ssp_writeable(spi_t *obj)
mbed_official 402:09075a3b15e3 237 {
mbed_official 84:f54042cbc282 238 int status;
mbed_official 340:28d1f895c6fe 239 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 84:f54042cbc282 240 // Check if data is transmitted
mbed_official 340:28d1f895c6fe 241 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 84:f54042cbc282 242 return status;
mbed_official 84:f54042cbc282 243 }
mbed_official 84:f54042cbc282 244
mbed_official 402:09075a3b15e3 245 static inline void ssp_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 246 {
mbed_official 216:577900467c9e 247 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 84:f54042cbc282 248 while (!ssp_writeable(obj));
mbed_official 404:cbc7dfcb0ce9 249 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 404:cbc7dfcb0ce9 250 // Force 8-bit access to the data register
mbed_official 340:28d1f895c6fe 251 uint8_t *p_spi_dr = 0;
mbed_official 340:28d1f895c6fe 252 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 340:28d1f895c6fe 253 *p_spi_dr = (uint8_t)value;
mbed_official 404:cbc7dfcb0ce9 254 } else { // SPI_DATASIZE_16BIT
mbed_official 340:28d1f895c6fe 255 spi->DR = (uint16_t)value;
mbed_official 166:cb4253f91ada 256 }
mbed_official 84:f54042cbc282 257 }
mbed_official 84:f54042cbc282 258
mbed_official 402:09075a3b15e3 259 static inline int ssp_read(spi_t *obj)
mbed_official 402:09075a3b15e3 260 {
mbed_official 216:577900467c9e 261 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 84:f54042cbc282 262 while (!ssp_readable(obj));
mbed_official 404:cbc7dfcb0ce9 263 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 404:cbc7dfcb0ce9 264 // Force 8-bit access to the data register
mbed_official 340:28d1f895c6fe 265 uint8_t *p_spi_dr = 0;
mbed_official 340:28d1f895c6fe 266 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 340:28d1f895c6fe 267 return (int)(*p_spi_dr);
mbed_official 340:28d1f895c6fe 268 } else {
mbed_official 340:28d1f895c6fe 269 return (int)spi->DR;
mbed_official 166:cb4253f91ada 270 }
mbed_official 84:f54042cbc282 271 }
mbed_official 84:f54042cbc282 272
mbed_official 402:09075a3b15e3 273 static inline int ssp_busy(spi_t *obj)
mbed_official 402:09075a3b15e3 274 {
mbed_official 84:f54042cbc282 275 int status;
mbed_official 340:28d1f895c6fe 276 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 340:28d1f895c6fe 277 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 84:f54042cbc282 278 return status;
mbed_official 84:f54042cbc282 279 }
mbed_official 84:f54042cbc282 280
mbed_official 402:09075a3b15e3 281 int spi_master_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 282 {
mbed_official 402:09075a3b15e3 283 ssp_write(obj, value);
mbed_official 402:09075a3b15e3 284 return ssp_read(obj);
mbed_official 84:f54042cbc282 285 }
mbed_official 84:f54042cbc282 286
mbed_official 402:09075a3b15e3 287 int spi_slave_receive(spi_t *obj)
mbed_official 402:09075a3b15e3 288 {
mbed_official 402:09075a3b15e3 289 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 84:f54042cbc282 290 };
mbed_official 84:f54042cbc282 291
mbed_official 402:09075a3b15e3 292 int spi_slave_read(spi_t *obj)
mbed_official 402:09075a3b15e3 293 {
mbed_official 84:f54042cbc282 294 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 402:09075a3b15e3 295 while (!ssp_readable(obj));
mbed_official 404:cbc7dfcb0ce9 296 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 404:cbc7dfcb0ce9 297 // Force 8-bit access to the data register
mbed_official 404:cbc7dfcb0ce9 298 uint8_t *p_spi_dr = 0;
mbed_official 404:cbc7dfcb0ce9 299 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 404:cbc7dfcb0ce9 300 return (int)(*p_spi_dr);
mbed_official 404:cbc7dfcb0ce9 301 } else {
mbed_official 404:cbc7dfcb0ce9 302 return (int)spi->DR;
mbed_official 404:cbc7dfcb0ce9 303 }
mbed_official 84:f54042cbc282 304 }
mbed_official 84:f54042cbc282 305
mbed_official 402:09075a3b15e3 306 void spi_slave_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 307 {
mbed_official 216:577900467c9e 308 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 402:09075a3b15e3 309 while (!ssp_writeable(obj));
mbed_official 404:cbc7dfcb0ce9 310 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 404:cbc7dfcb0ce9 311 // Force 8-bit access to the data register
mbed_official 404:cbc7dfcb0ce9 312 uint8_t *p_spi_dr = 0;
mbed_official 404:cbc7dfcb0ce9 313 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 404:cbc7dfcb0ce9 314 *p_spi_dr = (uint8_t)value;
mbed_official 404:cbc7dfcb0ce9 315 } else { // SPI_DATASIZE_16BIT
mbed_official 404:cbc7dfcb0ce9 316 spi->DR = (uint16_t)value;
mbed_official 404:cbc7dfcb0ce9 317 }
mbed_official 84:f54042cbc282 318 }
mbed_official 84:f54042cbc282 319
mbed_official 402:09075a3b15e3 320 int spi_busy(spi_t *obj)
mbed_official 402:09075a3b15e3 321 {
mbed_official 84:f54042cbc282 322 return ssp_busy(obj);
mbed_official 84:f54042cbc282 323 }
mbed_official 84:f54042cbc282 324
mbed_official 84:f54042cbc282 325 #endif