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mbed library sources

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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_STM/TARGET_STM32L4/spi_api.c@610:813dcc80987e, 2015-08-14 (annotated)

Committer:
mbed_official
Date:
Fri Aug 14 13:15:17 2015 +0100
Revision:
610:813dcc80987e
Synchronized with git revision 6d84db41c6833e0b9b024741eb0616a5f62d5599



Full URL: https://github.com/mbedmicro/mbed/commit/6d84db41c6833e0b9b024741eb0616a5f62d5599/



DISCO_F746NG - Improvements

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 610:813dcc80987e 1 /* mbed Microcontroller Library
mbed_official 610:813dcc80987e 2 *******************************************************************************
mbed_official 610:813dcc80987e 3 * Copyright (c) 2015, STMicroelectronics
mbed_official 610:813dcc80987e 4 * All rights reserved.
mbed_official 610:813dcc80987e 5 *
mbed_official 610:813dcc80987e 6 * Redistribution and use in source and binary forms, with or without
mbed_official 610:813dcc80987e 7 * modification, are permitted provided that the following conditions are met:
mbed_official 610:813dcc80987e 8 *
mbed_official 610:813dcc80987e 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 610:813dcc80987e 10 * this list of conditions and the following disclaimer.
mbed_official 610:813dcc80987e 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 610:813dcc80987e 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 610:813dcc80987e 13 * and/or other materials provided with the distribution.
mbed_official 610:813dcc80987e 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 610:813dcc80987e 15 * may be used to endorse or promote products derived from this software
mbed_official 610:813dcc80987e 16 * without specific prior written permission.
mbed_official 610:813dcc80987e 17 *
mbed_official 610:813dcc80987e 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 610:813dcc80987e 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 610:813dcc80987e 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 610:813dcc80987e 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 610:813dcc80987e 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 610:813dcc80987e 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 610:813dcc80987e 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 610:813dcc80987e 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 610:813dcc80987e 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 610:813dcc80987e 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 610:813dcc80987e 28 *******************************************************************************
mbed_official 610:813dcc80987e 29 */
mbed_official 610:813dcc80987e 30 #include "mbed_assert.h"
mbed_official 610:813dcc80987e 31 #include "spi_api.h"
mbed_official 610:813dcc80987e 32
mbed_official 610:813dcc80987e 33 #if DEVICE_SPI
mbed_official 610:813dcc80987e 34
mbed_official 610:813dcc80987e 35 #include <math.h>
mbed_official 610:813dcc80987e 36 #include "cmsis.h"
mbed_official 610:813dcc80987e 37 #include "pinmap.h"
mbed_official 610:813dcc80987e 38 #include "mbed_error.h"
mbed_official 610:813dcc80987e 39 #include "PeripheralPins.h"
mbed_official 610:813dcc80987e 40
mbed_official 610:813dcc80987e 41 static SPI_HandleTypeDef SpiHandle;
mbed_official 610:813dcc80987e 42
mbed_official 610:813dcc80987e 43 static void init_spi(spi_t *obj)
mbed_official 610:813dcc80987e 44 {
mbed_official 610:813dcc80987e 45 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 610:813dcc80987e 46
mbed_official 610:813dcc80987e 47 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 610:813dcc80987e 48
mbed_official 610:813dcc80987e 49 SpiHandle.Init.Mode = obj->mode;
mbed_official 610:813dcc80987e 50 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 610:813dcc80987e 51 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 610:813dcc80987e 52 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 610:813dcc80987e 53 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 610:813dcc80987e 54 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
mbed_official 610:813dcc80987e 55 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 610:813dcc80987e 56 SpiHandle.Init.CRCLength = SPI_CRC_LENGTH_8BIT;
mbed_official 610:813dcc80987e 57 SpiHandle.Init.DataSize = obj->bits;
mbed_official 610:813dcc80987e 58 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 610:813dcc80987e 59 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLE;
mbed_official 610:813dcc80987e 60 SpiHandle.Init.NSS = obj->nss;
mbed_official 610:813dcc80987e 61 SpiHandle.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
mbed_official 610:813dcc80987e 62
mbed_official 610:813dcc80987e 63 if (HAL_SPI_Init(&SpiHandle) != HAL_OK) {
mbed_official 610:813dcc80987e 64 error("Cannot initialize SPI\n");
mbed_official 610:813dcc80987e 65 }
mbed_official 610:813dcc80987e 66
mbed_official 610:813dcc80987e 67 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 610:813dcc80987e 68 }
mbed_official 610:813dcc80987e 69
mbed_official 610:813dcc80987e 70 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 610:813dcc80987e 71 {
mbed_official 610:813dcc80987e 72 // Determine the SPI to use
mbed_official 610:813dcc80987e 73 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 610:813dcc80987e 74 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 610:813dcc80987e 75 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 610:813dcc80987e 76 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 610:813dcc80987e 77
mbed_official 610:813dcc80987e 78 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 610:813dcc80987e 79 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 610:813dcc80987e 80
mbed_official 610:813dcc80987e 81 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 610:813dcc80987e 82 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 610:813dcc80987e 83
mbed_official 610:813dcc80987e 84 // Enable SPI clock
mbed_official 610:813dcc80987e 85 if (obj->spi == SPI_1) {
mbed_official 610:813dcc80987e 86 __HAL_RCC_SPI1_CLK_ENABLE();
mbed_official 610:813dcc80987e 87 }
mbed_official 610:813dcc80987e 88 if (obj->spi == SPI_2) {
mbed_official 610:813dcc80987e 89 __HAL_RCC_SPI2_CLK_ENABLE();
mbed_official 610:813dcc80987e 90 }
mbed_official 610:813dcc80987e 91 if (obj->spi == SPI_3) {
mbed_official 610:813dcc80987e 92 __HAL_RCC_SPI3_CLK_ENABLE();
mbed_official 610:813dcc80987e 93 }
mbed_official 610:813dcc80987e 94
mbed_official 610:813dcc80987e 95 // Configure the SPI pins
mbed_official 610:813dcc80987e 96 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 610:813dcc80987e 97 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 610:813dcc80987e 98 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 610:813dcc80987e 99
mbed_official 610:813dcc80987e 100 // Save new values
mbed_official 610:813dcc80987e 101 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 610:813dcc80987e 102 obj->cpol = SPI_POLARITY_LOW;
mbed_official 610:813dcc80987e 103 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 610:813dcc80987e 104 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 610:813dcc80987e 105
mbed_official 610:813dcc80987e 106 obj->pin_miso = miso;
mbed_official 610:813dcc80987e 107 obj->pin_mosi = mosi;
mbed_official 610:813dcc80987e 108 obj->pin_sclk = sclk;
mbed_official 610:813dcc80987e 109 obj->pin_ssel = ssel;
mbed_official 610:813dcc80987e 110
mbed_official 610:813dcc80987e 111 if (ssel == NC) { // SW NSS Master mode
mbed_official 610:813dcc80987e 112 obj->mode = SPI_MODE_MASTER;
mbed_official 610:813dcc80987e 113 obj->nss = SPI_NSS_SOFT;
mbed_official 610:813dcc80987e 114 } else { // Slave
mbed_official 610:813dcc80987e 115 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 610:813dcc80987e 116 obj->mode = SPI_MODE_SLAVE;
mbed_official 610:813dcc80987e 117 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 610:813dcc80987e 118 }
mbed_official 610:813dcc80987e 119
mbed_official 610:813dcc80987e 120 init_spi(obj);
mbed_official 610:813dcc80987e 121 }
mbed_official 610:813dcc80987e 122
mbed_official 610:813dcc80987e 123 void spi_free(spi_t *obj)
mbed_official 610:813dcc80987e 124 {
mbed_official 610:813dcc80987e 125 // Reset SPI and disable clock
mbed_official 610:813dcc80987e 126 if (obj->spi == SPI_1) {
mbed_official 610:813dcc80987e 127 __HAL_RCC_SPI1_FORCE_RESET();
mbed_official 610:813dcc80987e 128 __HAL_RCC_SPI1_RELEASE_RESET();
mbed_official 610:813dcc80987e 129 __HAL_RCC_SPI1_CLK_DISABLE();
mbed_official 610:813dcc80987e 130 }
mbed_official 610:813dcc80987e 131
mbed_official 610:813dcc80987e 132 if (obj->spi == SPI_2) {
mbed_official 610:813dcc80987e 133 __HAL_RCC_SPI2_FORCE_RESET();
mbed_official 610:813dcc80987e 134 __HAL_RCC_SPI2_RELEASE_RESET();
mbed_official 610:813dcc80987e 135 __HAL_RCC_SPI2_CLK_DISABLE();
mbed_official 610:813dcc80987e 136 }
mbed_official 610:813dcc80987e 137
mbed_official 610:813dcc80987e 138 if (obj->spi == SPI_3) {
mbed_official 610:813dcc80987e 139 __HAL_RCC_SPI3_FORCE_RESET();
mbed_official 610:813dcc80987e 140 __HAL_RCC_SPI3_RELEASE_RESET();
mbed_official 610:813dcc80987e 141 __HAL_RCC_SPI3_CLK_DISABLE();
mbed_official 610:813dcc80987e 142 }
mbed_official 610:813dcc80987e 143
mbed_official 610:813dcc80987e 144 // Configure GPIO
mbed_official 610:813dcc80987e 145 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 610:813dcc80987e 146 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 610:813dcc80987e 147 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 610:813dcc80987e 148 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 610:813dcc80987e 149 }
mbed_official 610:813dcc80987e 150
mbed_official 610:813dcc80987e 151 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 610:813dcc80987e 152 {
mbed_official 610:813dcc80987e 153 // Save new values
mbed_official 610:813dcc80987e 154 if (bits == 16) {
mbed_official 610:813dcc80987e 155 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 610:813dcc80987e 156 } else {
mbed_official 610:813dcc80987e 157 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 610:813dcc80987e 158 }
mbed_official 610:813dcc80987e 159
mbed_official 610:813dcc80987e 160 switch (mode) {
mbed_official 610:813dcc80987e 161 case 0:
mbed_official 610:813dcc80987e 162 obj->cpol = SPI_POLARITY_LOW;
mbed_official 610:813dcc80987e 163 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 610:813dcc80987e 164 break;
mbed_official 610:813dcc80987e 165 case 1:
mbed_official 610:813dcc80987e 166 obj->cpol = SPI_POLARITY_LOW;
mbed_official 610:813dcc80987e 167 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 610:813dcc80987e 168 break;
mbed_official 610:813dcc80987e 169 case 2:
mbed_official 610:813dcc80987e 170 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 610:813dcc80987e 171 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 610:813dcc80987e 172 break;
mbed_official 610:813dcc80987e 173 default:
mbed_official 610:813dcc80987e 174 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 610:813dcc80987e 175 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 610:813dcc80987e 176 break;
mbed_official 610:813dcc80987e 177 }
mbed_official 610:813dcc80987e 178
mbed_official 610:813dcc80987e 179 if (slave == 0) {
mbed_official 610:813dcc80987e 180 obj->mode = SPI_MODE_MASTER;
mbed_official 610:813dcc80987e 181 obj->nss = SPI_NSS_SOFT;
mbed_official 610:813dcc80987e 182 } else {
mbed_official 610:813dcc80987e 183 obj->mode = SPI_MODE_SLAVE;
mbed_official 610:813dcc80987e 184 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 610:813dcc80987e 185 }
mbed_official 610:813dcc80987e 186
mbed_official 610:813dcc80987e 187 init_spi(obj);
mbed_official 610:813dcc80987e 188 }
mbed_official 610:813dcc80987e 189
mbed_official 610:813dcc80987e 190 void spi_frequency(spi_t *obj, int hz)
mbed_official 610:813dcc80987e 191 {
mbed_official 610:813dcc80987e 192 // Values depend of PCLK1 and PCLK2: 80 MHz if MSI or HSI is used, 48 MHz if HSE is used
mbed_official 610:813dcc80987e 193 if (SystemCoreClock == 80000000) { // MSI or HSI
mbed_official 610:813dcc80987e 194 if (hz < 600000) {
mbed_official 610:813dcc80987e 195 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 313 kHz
mbed_official 610:813dcc80987e 196 } else if ((hz >= 600000) && (hz < 1000000)) {
mbed_official 610:813dcc80987e 197 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 625 kHz
mbed_official 610:813dcc80987e 198 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 610:813dcc80987e 199 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.25 MHz (default)
mbed_official 610:813dcc80987e 200 } else if ((hz >= 2000000) && (hz < 5000000)) {
mbed_official 610:813dcc80987e 201 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2.5 MHz
mbed_official 610:813dcc80987e 202 } else if ((hz >= 5000000) && (hz < 10000000)) {
mbed_official 610:813dcc80987e 203 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 5 MHz
mbed_official 610:813dcc80987e 204 } else if ((hz >= 10000000) && (hz < 20000000)) {
mbed_official 610:813dcc80987e 205 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 10 MHz
mbed_official 610:813dcc80987e 206 } else if ((hz >= 20000000) && (hz < 40000000)) {
mbed_official 610:813dcc80987e 207 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 20 MHz
mbed_official 610:813dcc80987e 208 } else { // >= 40000000
mbed_official 610:813dcc80987e 209 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 40 MHz
mbed_official 610:813dcc80987e 210 }
mbed_official 610:813dcc80987e 211 } else { // 48 MHz - HSE
mbed_official 610:813dcc80987e 212 if (hz < 350000) {
mbed_official 610:813dcc80987e 213 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 188 kHz
mbed_official 610:813dcc80987e 214 } else if ((hz >= 350000) && (hz < 750000)) {
mbed_official 610:813dcc80987e 215 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
mbed_official 610:813dcc80987e 216 } else if ((hz >= 750000) && (hz < 1000000)) {
mbed_official 610:813dcc80987e 217 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 750 kHz
mbed_official 610:813dcc80987e 218 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 610:813dcc80987e 219 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz (default)
mbed_official 610:813dcc80987e 220 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 610:813dcc80987e 221 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
mbed_official 610:813dcc80987e 222 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 610:813dcc80987e 223 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
mbed_official 610:813dcc80987e 224 } else if ((hz >= 12000000) && (hz < 24000000)) {
mbed_official 610:813dcc80987e 225 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
mbed_official 610:813dcc80987e 226 } else { // >= 24000000
mbed_official 610:813dcc80987e 227 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
mbed_official 610:813dcc80987e 228 }
mbed_official 610:813dcc80987e 229 }
mbed_official 610:813dcc80987e 230
mbed_official 610:813dcc80987e 231 init_spi(obj);
mbed_official 610:813dcc80987e 232 }
mbed_official 610:813dcc80987e 233
mbed_official 610:813dcc80987e 234 static inline int ssp_readable(spi_t *obj)
mbed_official 610:813dcc80987e 235 {
mbed_official 610:813dcc80987e 236 int status;
mbed_official 610:813dcc80987e 237 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 610:813dcc80987e 238 // Check if data is received
mbed_official 610:813dcc80987e 239 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 610:813dcc80987e 240 return status;
mbed_official 610:813dcc80987e 241 }
mbed_official 610:813dcc80987e 242
mbed_official 610:813dcc80987e 243 static inline int ssp_writeable(spi_t *obj)
mbed_official 610:813dcc80987e 244 {
mbed_official 610:813dcc80987e 245 int status;
mbed_official 610:813dcc80987e 246 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 610:813dcc80987e 247 // Check if data is transmitted
mbed_official 610:813dcc80987e 248 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 610:813dcc80987e 249 return status;
mbed_official 610:813dcc80987e 250 }
mbed_official 610:813dcc80987e 251
mbed_official 610:813dcc80987e 252 static inline void ssp_write(spi_t *obj, int value)
mbed_official 610:813dcc80987e 253 {
mbed_official 610:813dcc80987e 254 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 610:813dcc80987e 255 while (!ssp_writeable(obj));
mbed_official 610:813dcc80987e 256 //spi->DR = (uint16_t)value;
mbed_official 610:813dcc80987e 257 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 610:813dcc80987e 258 // Force 8-bit access to the data register
mbed_official 610:813dcc80987e 259 uint8_t *p_spi_dr = 0;
mbed_official 610:813dcc80987e 260 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 610:813dcc80987e 261 *p_spi_dr = (uint8_t)value;
mbed_official 610:813dcc80987e 262 } else { // SPI_DATASIZE_16BIT
mbed_official 610:813dcc80987e 263 spi->DR = (uint16_t)value;
mbed_official 610:813dcc80987e 264 }
mbed_official 610:813dcc80987e 265 }
mbed_official 610:813dcc80987e 266
mbed_official 610:813dcc80987e 267 static inline int ssp_read(spi_t *obj)
mbed_official 610:813dcc80987e 268 {
mbed_official 610:813dcc80987e 269 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 610:813dcc80987e 270 while (!ssp_readable(obj));
mbed_official 610:813dcc80987e 271 //return (int)spi->DR;
mbed_official 610:813dcc80987e 272 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 610:813dcc80987e 273 // Force 8-bit access to the data register
mbed_official 610:813dcc80987e 274 uint8_t *p_spi_dr = 0;
mbed_official 610:813dcc80987e 275 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 610:813dcc80987e 276 return (int)(*p_spi_dr);
mbed_official 610:813dcc80987e 277 } else {
mbed_official 610:813dcc80987e 278 return (int)spi->DR;
mbed_official 610:813dcc80987e 279 }
mbed_official 610:813dcc80987e 280 }
mbed_official 610:813dcc80987e 281
mbed_official 610:813dcc80987e 282 static inline int ssp_busy(spi_t *obj)
mbed_official 610:813dcc80987e 283 {
mbed_official 610:813dcc80987e 284 int status;
mbed_official 610:813dcc80987e 285 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 610:813dcc80987e 286 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 610:813dcc80987e 287 return status;
mbed_official 610:813dcc80987e 288 }
mbed_official 610:813dcc80987e 289
mbed_official 610:813dcc80987e 290 int spi_master_write(spi_t *obj, int value)
mbed_official 610:813dcc80987e 291 {
mbed_official 610:813dcc80987e 292 ssp_write(obj, value);
mbed_official 610:813dcc80987e 293 return ssp_read(obj);
mbed_official 610:813dcc80987e 294 }
mbed_official 610:813dcc80987e 295
mbed_official 610:813dcc80987e 296 int spi_slave_receive(spi_t *obj)
mbed_official 610:813dcc80987e 297 {
mbed_official 610:813dcc80987e 298 return (ssp_readable(obj) ? 1 : 0);
mbed_official 610:813dcc80987e 299 };
mbed_official 610:813dcc80987e 300
mbed_official 610:813dcc80987e 301 int spi_slave_read(spi_t *obj)
mbed_official 610:813dcc80987e 302 {
mbed_official 610:813dcc80987e 303 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 610:813dcc80987e 304 while (!ssp_readable(obj));
mbed_official 610:813dcc80987e 305 //return (int)spi->DR;
mbed_official 610:813dcc80987e 306 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 610:813dcc80987e 307 // Force 8-bit access to the data register
mbed_official 610:813dcc80987e 308 uint8_t *p_spi_dr = 0;
mbed_official 610:813dcc80987e 309 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 610:813dcc80987e 310 return (int)(*p_spi_dr);
mbed_official 610:813dcc80987e 311 } else {
mbed_official 610:813dcc80987e 312 return (int)spi->DR;
mbed_official 610:813dcc80987e 313 }
mbed_official 610:813dcc80987e 314 }
mbed_official 610:813dcc80987e 315
mbed_official 610:813dcc80987e 316 void spi_slave_write(spi_t *obj, int value)
mbed_official 610:813dcc80987e 317 {
mbed_official 610:813dcc80987e 318 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 610:813dcc80987e 319 while (!ssp_writeable(obj));
mbed_official 610:813dcc80987e 320 //spi->DR = (uint16_t)value;
mbed_official 610:813dcc80987e 321 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 610:813dcc80987e 322 // Force 8-bit access to the data register
mbed_official 610:813dcc80987e 323 uint8_t *p_spi_dr = 0;
mbed_official 610:813dcc80987e 324 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 610:813dcc80987e 325 *p_spi_dr = (uint8_t)value;
mbed_official 610:813dcc80987e 326 } else { // SPI_DATASIZE_16BIT
mbed_official 610:813dcc80987e 327 spi->DR = (uint16_t)value;
mbed_official 610:813dcc80987e 328 }
mbed_official 610:813dcc80987e 329 }
mbed_official 610:813dcc80987e 330
mbed_official 610:813dcc80987e 331 int spi_busy(spi_t *obj)
mbed_official 610:813dcc80987e 332 {
mbed_official 610:813dcc80987e 333 return ssp_busy(obj);
mbed_official 610:813dcc80987e 334 }
mbed_official 610:813dcc80987e 335
mbed_official 610:813dcc80987e 336 #endif