mbed official / mbed-src

mbed library sources

Dependents:   Encrypted my_mbed lklk CyaSSL_DTLS_Cellular ... more

Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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

Import librarymbed

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_STM32F0/spi_api.c@552:a1b9575155a3, 2015-05-27 (annotated)

Committer:
mbed_official
Date:
Wed May 27 13:30:08 2015 +0100
Revision:
552:a1b9575155a3
Parent:
469:fc4922e0c183
Child:
630:825f75ca301e
Synchronized with git revision a74a8f14fd8c4bf3dc09980c4bf9498ebcf4c207



Full URL: https://github.com/mbedmicro/mbed/commit/a74a8f14fd8c4bf3dc09980c4bf9498ebcf4c207/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 441:d2c15dda23c1 1 /* mbed Microcontroller Library
mbed_official 441:d2c15dda23c1 2 *******************************************************************************
mbed_official 441:d2c15dda23c1 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 441:d2c15dda23c1 4 * All rights reserved.
mbed_official 441:d2c15dda23c1 5 *
mbed_official 441:d2c15dda23c1 6 * Redistribution and use in source and binary forms, with or without
mbed_official 441:d2c15dda23c1 7 * modification, are permitted provided that the following conditions are met:
mbed_official 441:d2c15dda23c1 8 *
mbed_official 441:d2c15dda23c1 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 441:d2c15dda23c1 10 * this list of conditions and the following disclaimer.
mbed_official 441:d2c15dda23c1 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 441:d2c15dda23c1 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 441:d2c15dda23c1 13 * and/or other materials provided with the distribution.
mbed_official 441:d2c15dda23c1 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 441:d2c15dda23c1 15 * may be used to endorse or promote products derived from this software
mbed_official 441:d2c15dda23c1 16 * without specific prior written permission.
mbed_official 441:d2c15dda23c1 17 *
mbed_official 441:d2c15dda23c1 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 441:d2c15dda23c1 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 441:d2c15dda23c1 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 441:d2c15dda23c1 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 441:d2c15dda23c1 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 441:d2c15dda23c1 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 441:d2c15dda23c1 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 441:d2c15dda23c1 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 441:d2c15dda23c1 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 441:d2c15dda23c1 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 441:d2c15dda23c1 28 *******************************************************************************
mbed_official 441:d2c15dda23c1 29 */
mbed_official 441:d2c15dda23c1 30 #include "mbed_assert.h"
mbed_official 441:d2c15dda23c1 31 #include "spi_api.h"
mbed_official 441:d2c15dda23c1 32
mbed_official 441:d2c15dda23c1 33 #if DEVICE_SPI
mbed_official 441:d2c15dda23c1 34
mbed_official 441:d2c15dda23c1 35 #include <math.h>
mbed_official 441:d2c15dda23c1 36 #include "cmsis.h"
mbed_official 441:d2c15dda23c1 37 #include "pinmap.h"
mbed_official 441:d2c15dda23c1 38 #include "PeripheralPins.h"
mbed_official 441:d2c15dda23c1 39
mbed_official 441:d2c15dda23c1 40 static SPI_HandleTypeDef SpiHandle;
mbed_official 441:d2c15dda23c1 41
mbed_official 441:d2c15dda23c1 42 static void init_spi(spi_t *obj)
mbed_official 441:d2c15dda23c1 43 {
mbed_official 441:d2c15dda23c1 44 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 45
mbed_official 441:d2c15dda23c1 46 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 441:d2c15dda23c1 47
mbed_official 441:d2c15dda23c1 48 SpiHandle.Init.Mode = obj->mode;
mbed_official 441:d2c15dda23c1 49 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 441:d2c15dda23c1 50 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 441:d2c15dda23c1 51 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 441:d2c15dda23c1 52 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 441:d2c15dda23c1 53 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 441:d2c15dda23c1 54 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 441:d2c15dda23c1 55 SpiHandle.Init.DataSize = obj->bits;
mbed_official 441:d2c15dda23c1 56 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 441:d2c15dda23c1 57 SpiHandle.Init.NSS = obj->nss;
mbed_official 441:d2c15dda23c1 58 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 441:d2c15dda23c1 59
mbed_official 441:d2c15dda23c1 60 HAL_SPI_Init(&SpiHandle);
mbed_official 441:d2c15dda23c1 61
mbed_official 441:d2c15dda23c1 62 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 441:d2c15dda23c1 63 }
mbed_official 441:d2c15dda23c1 64
mbed_official 441:d2c15dda23c1 65 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 441:d2c15dda23c1 66 {
mbed_official 441:d2c15dda23c1 67 // Determine the SPI to use
mbed_official 441:d2c15dda23c1 68 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 441:d2c15dda23c1 69 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 441:d2c15dda23c1 70 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 441:d2c15dda23c1 71 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 441:d2c15dda23c1 72
mbed_official 441:d2c15dda23c1 73 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 441:d2c15dda23c1 74 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 441:d2c15dda23c1 75
mbed_official 441:d2c15dda23c1 76 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 441:d2c15dda23c1 77 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 441:d2c15dda23c1 78
mbed_official 441:d2c15dda23c1 79 // Enable SPI clock
mbed_official 441:d2c15dda23c1 80 if (obj->spi == SPI_1) {
mbed_official 441:d2c15dda23c1 81 __SPI1_CLK_ENABLE();
mbed_official 441:d2c15dda23c1 82 }
mbed_official 441:d2c15dda23c1 83 if (obj->spi == SPI_2) {
mbed_official 441:d2c15dda23c1 84 __SPI2_CLK_ENABLE();
mbed_official 441:d2c15dda23c1 85 }
mbed_official 441:d2c15dda23c1 86
mbed_official 441:d2c15dda23c1 87 // Configure the SPI pins
mbed_official 441:d2c15dda23c1 88 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 441:d2c15dda23c1 89 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 441:d2c15dda23c1 90 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 441:d2c15dda23c1 91
mbed_official 441:d2c15dda23c1 92 // Save new values
mbed_official 441:d2c15dda23c1 93 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 441:d2c15dda23c1 94 obj->cpol = SPI_POLARITY_LOW;
mbed_official 441:d2c15dda23c1 95 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 441:d2c15dda23c1 96 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 441:d2c15dda23c1 97
mbed_official 441:d2c15dda23c1 98 obj->pin_miso = miso;
mbed_official 441:d2c15dda23c1 99 obj->pin_mosi = mosi;
mbed_official 441:d2c15dda23c1 100 obj->pin_sclk = sclk;
mbed_official 441:d2c15dda23c1 101 obj->pin_ssel = ssel;
mbed_official 441:d2c15dda23c1 102
mbed_official 552:a1b9575155a3 103 if (ssel != NC) {
mbed_official 552:a1b9575155a3 104 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 552:a1b9575155a3 105 } else {
mbed_official 441:d2c15dda23c1 106 obj->nss = SPI_NSS_SOFT;
mbed_official 441:d2c15dda23c1 107 }
mbed_official 441:d2c15dda23c1 108
mbed_official 441:d2c15dda23c1 109 init_spi(obj);
mbed_official 441:d2c15dda23c1 110 }
mbed_official 441:d2c15dda23c1 111
mbed_official 441:d2c15dda23c1 112 void spi_free(spi_t *obj)
mbed_official 441:d2c15dda23c1 113 {
mbed_official 441:d2c15dda23c1 114 // Reset SPI and disable clock
mbed_official 441:d2c15dda23c1 115 if (obj->spi == SPI_1) {
mbed_official 441:d2c15dda23c1 116 __SPI1_FORCE_RESET();
mbed_official 441:d2c15dda23c1 117 __SPI1_RELEASE_RESET();
mbed_official 441:d2c15dda23c1 118 __SPI1_CLK_DISABLE();
mbed_official 441:d2c15dda23c1 119 }
mbed_official 441:d2c15dda23c1 120
mbed_official 441:d2c15dda23c1 121 if (obj->spi == SPI_2) {
mbed_official 441:d2c15dda23c1 122 __SPI2_FORCE_RESET();
mbed_official 441:d2c15dda23c1 123 __SPI2_RELEASE_RESET();
mbed_official 441:d2c15dda23c1 124 __SPI2_CLK_DISABLE();
mbed_official 441:d2c15dda23c1 125 }
mbed_official 441:d2c15dda23c1 126
mbed_official 441:d2c15dda23c1 127 // Configure GPIOs
mbed_official 441:d2c15dda23c1 128 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 441:d2c15dda23c1 129 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 441:d2c15dda23c1 130 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 441:d2c15dda23c1 131 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 441:d2c15dda23c1 132 }
mbed_official 441:d2c15dda23c1 133
mbed_official 441:d2c15dda23c1 134 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 441:d2c15dda23c1 135 {
mbed_official 441:d2c15dda23c1 136 // Save new values
mbed_official 441:d2c15dda23c1 137 if (bits == 16) {
mbed_official 441:d2c15dda23c1 138 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 441:d2c15dda23c1 139 } else {
mbed_official 441:d2c15dda23c1 140 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 441:d2c15dda23c1 141 }
mbed_official 441:d2c15dda23c1 142
mbed_official 441:d2c15dda23c1 143 switch (mode) {
mbed_official 441:d2c15dda23c1 144 case 0:
mbed_official 441:d2c15dda23c1 145 obj->cpol = SPI_POLARITY_LOW;
mbed_official 441:d2c15dda23c1 146 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 441:d2c15dda23c1 147 break;
mbed_official 441:d2c15dda23c1 148 case 1:
mbed_official 441:d2c15dda23c1 149 obj->cpol = SPI_POLARITY_LOW;
mbed_official 441:d2c15dda23c1 150 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 441:d2c15dda23c1 151 break;
mbed_official 441:d2c15dda23c1 152 case 2:
mbed_official 441:d2c15dda23c1 153 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 441:d2c15dda23c1 154 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 441:d2c15dda23c1 155 break;
mbed_official 441:d2c15dda23c1 156 default:
mbed_official 441:d2c15dda23c1 157 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 441:d2c15dda23c1 158 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 441:d2c15dda23c1 159 break;
mbed_official 441:d2c15dda23c1 160 }
mbed_official 441:d2c15dda23c1 161
mbed_official 552:a1b9575155a3 162 if (obj->nss != SPI_NSS_SOFT) {
mbed_official 552:a1b9575155a3 163 obj->nss = (slave) ? SPI_NSS_HARD_INPUT : SPI_NSS_HARD_OUTPUT;
mbed_official 441:d2c15dda23c1 164 }
mbed_official 441:d2c15dda23c1 165
mbed_official 552:a1b9575155a3 166 obj->mode = (slave) ? SPI_MODE_SLAVE : SPI_MODE_MASTER;
mbed_official 552:a1b9575155a3 167
mbed_official 441:d2c15dda23c1 168 init_spi(obj);
mbed_official 441:d2c15dda23c1 169 }
mbed_official 441:d2c15dda23c1 170
mbed_official 441:d2c15dda23c1 171 void spi_frequency(spi_t *obj, int hz)
mbed_official 441:d2c15dda23c1 172 {
mbed_official 441:d2c15dda23c1 173 // Note: The frequencies are obtained with SPI clock = 48 MHz (APB clock)
mbed_official 441:d2c15dda23c1 174 if (hz < 375000) {
mbed_official 441:d2c15dda23c1 175 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 188 kHz
mbed_official 441:d2c15dda23c1 176 } else if ((hz >= 375000) && (hz < 750000)) {
mbed_official 441:d2c15dda23c1 177 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
mbed_official 441:d2c15dda23c1 178 } else if ((hz >= 750000) && (hz < 1000000)) {
mbed_official 441:d2c15dda23c1 179 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 750 kHz
mbed_official 441:d2c15dda23c1 180 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 441:d2c15dda23c1 181 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz
mbed_official 441:d2c15dda23c1 182 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 441:d2c15dda23c1 183 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
mbed_official 441:d2c15dda23c1 184 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 441:d2c15dda23c1 185 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
mbed_official 441:d2c15dda23c1 186 } else if ((hz >= 12000000) && (hz < 24000000)) {
mbed_official 441:d2c15dda23c1 187 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
mbed_official 441:d2c15dda23c1 188 } else { // >= 24000000
mbed_official 441:d2c15dda23c1 189 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
mbed_official 441:d2c15dda23c1 190 }
mbed_official 441:d2c15dda23c1 191
mbed_official 441:d2c15dda23c1 192 init_spi(obj);
mbed_official 441:d2c15dda23c1 193 }
mbed_official 441:d2c15dda23c1 194
mbed_official 441:d2c15dda23c1 195 static inline int ssp_readable(spi_t *obj)
mbed_official 441:d2c15dda23c1 196 {
mbed_official 441:d2c15dda23c1 197 int status;
mbed_official 441:d2c15dda23c1 198 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 199 // Check if data is received
mbed_official 441:d2c15dda23c1 200 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 441:d2c15dda23c1 201 return status;
mbed_official 441:d2c15dda23c1 202 }
mbed_official 441:d2c15dda23c1 203
mbed_official 441:d2c15dda23c1 204 static inline int ssp_writeable(spi_t *obj)
mbed_official 441:d2c15dda23c1 205 {
mbed_official 441:d2c15dda23c1 206 int status;
mbed_official 441:d2c15dda23c1 207 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 208 // Check if data is transmitted
mbed_official 441:d2c15dda23c1 209 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 441:d2c15dda23c1 210 return status;
mbed_official 441:d2c15dda23c1 211 }
mbed_official 441:d2c15dda23c1 212
mbed_official 441:d2c15dda23c1 213 static inline void ssp_write(spi_t *obj, int value)
mbed_official 441:d2c15dda23c1 214 {
mbed_official 441:d2c15dda23c1 215 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 216 while (!ssp_writeable(obj));
mbed_official 441:d2c15dda23c1 217 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 441:d2c15dda23c1 218 // Force 8-bit access to the data register
mbed_official 441:d2c15dda23c1 219 uint8_t *p_spi_dr = 0;
mbed_official 441:d2c15dda23c1 220 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 441:d2c15dda23c1 221 *p_spi_dr = (uint8_t)value;
mbed_official 441:d2c15dda23c1 222 } else { // SPI_DATASIZE_16BIT
mbed_official 441:d2c15dda23c1 223 spi->DR = (uint16_t)value;
mbed_official 441:d2c15dda23c1 224 }
mbed_official 441:d2c15dda23c1 225 }
mbed_official 441:d2c15dda23c1 226
mbed_official 441:d2c15dda23c1 227 static inline int ssp_read(spi_t *obj)
mbed_official 441:d2c15dda23c1 228 {
mbed_official 441:d2c15dda23c1 229 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 230 while (!ssp_readable(obj));
mbed_official 441:d2c15dda23c1 231 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 441:d2c15dda23c1 232 // Force 8-bit access to the data register
mbed_official 441:d2c15dda23c1 233 uint8_t *p_spi_dr = 0;
mbed_official 441:d2c15dda23c1 234 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 441:d2c15dda23c1 235 return (int)(*p_spi_dr);
mbed_official 441:d2c15dda23c1 236 } else {
mbed_official 441:d2c15dda23c1 237 return (int)spi->DR;
mbed_official 441:d2c15dda23c1 238 }
mbed_official 441:d2c15dda23c1 239 }
mbed_official 441:d2c15dda23c1 240
mbed_official 441:d2c15dda23c1 241 static inline int ssp_busy(spi_t *obj)
mbed_official 441:d2c15dda23c1 242 {
mbed_official 441:d2c15dda23c1 243 int status;
mbed_official 441:d2c15dda23c1 244 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 245 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 441:d2c15dda23c1 246 return status;
mbed_official 441:d2c15dda23c1 247 }
mbed_official 441:d2c15dda23c1 248
mbed_official 441:d2c15dda23c1 249 int spi_master_write(spi_t *obj, int value)
mbed_official 441:d2c15dda23c1 250 {
mbed_official 441:d2c15dda23c1 251 ssp_write(obj, value);
mbed_official 441:d2c15dda23c1 252 return ssp_read(obj);
mbed_official 441:d2c15dda23c1 253 }
mbed_official 441:d2c15dda23c1 254
mbed_official 441:d2c15dda23c1 255 int spi_slave_receive(spi_t *obj)
mbed_official 441:d2c15dda23c1 256 {
mbed_official 441:d2c15dda23c1 257 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 441:d2c15dda23c1 258 };
mbed_official 441:d2c15dda23c1 259
mbed_official 441:d2c15dda23c1 260 int spi_slave_read(spi_t *obj)
mbed_official 441:d2c15dda23c1 261 {
mbed_official 441:d2c15dda23c1 262 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 263 while (!ssp_readable(obj));
mbed_official 441:d2c15dda23c1 264 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 441:d2c15dda23c1 265 // Force 8-bit access to the data register
mbed_official 441:d2c15dda23c1 266 uint8_t *p_spi_dr = 0;
mbed_official 441:d2c15dda23c1 267 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 441:d2c15dda23c1 268 return (int)(*p_spi_dr);
mbed_official 441:d2c15dda23c1 269 } else {
mbed_official 441:d2c15dda23c1 270 return (int)spi->DR;
mbed_official 441:d2c15dda23c1 271 }
mbed_official 441:d2c15dda23c1 272 }
mbed_official 441:d2c15dda23c1 273
mbed_official 441:d2c15dda23c1 274 void spi_slave_write(spi_t *obj, int value)
mbed_official 441:d2c15dda23c1 275 {
mbed_official 441:d2c15dda23c1 276 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 277 while (!ssp_writeable(obj));
mbed_official 441:d2c15dda23c1 278 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 441:d2c15dda23c1 279 // Force 8-bit access to the data register
mbed_official 441:d2c15dda23c1 280 uint8_t *p_spi_dr = 0;
mbed_official 441:d2c15dda23c1 281 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 441:d2c15dda23c1 282 *p_spi_dr = (uint8_t)value;
mbed_official 441:d2c15dda23c1 283 } else { // SPI_DATASIZE_16BIT
mbed_official 441:d2c15dda23c1 284 spi->DR = (uint16_t)value;
mbed_official 441:d2c15dda23c1 285 }
mbed_official 441:d2c15dda23c1 286 }
mbed_official 441:d2c15dda23c1 287
mbed_official 441:d2c15dda23c1 288 int spi_busy(spi_t *obj)
mbed_official 441:d2c15dda23c1 289 {
mbed_official 441:d2c15dda23c1 290 return ssp_busy(obj);
mbed_official 441:d2c15dda23c1 291 }
mbed_official 441:d2c15dda23c1 292
mbed_official 441:d2c15dda23c1 293 #endif