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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_STM32F0/spi_api.c@630:825f75ca301e, 2015-09-28 (annotated)

Committer:
mbed_official
Date:
Mon Sep 28 10:45:10 2015 +0100
Revision:
630:825f75ca301e
Parent:
552:a1b9575155a3 
Synchronized with git revision 54fbe4144faf309c37205a5d39fa665daa919f10



Full URL: https://github.com/mbedmicro/mbed/commit/54fbe4144faf309c37205a5d39fa665daa919f10/



NUCLEO_F031K6 : Add new target

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 630:825f75ca301e 3 * Copyright (c) 2015, 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 630:825f75ca301e 42 static void init_spi(spi_t *obj) {
mbed_official 441:d2c15dda23c1 43 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 44
mbed_official 441:d2c15dda23c1 45 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 441:d2c15dda23c1 46
mbed_official 441:d2c15dda23c1 47 SpiHandle.Init.Mode = obj->mode;
mbed_official 441:d2c15dda23c1 48 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 441:d2c15dda23c1 49 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 441:d2c15dda23c1 50 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 441:d2c15dda23c1 51 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 441:d2c15dda23c1 52 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 441:d2c15dda23c1 53 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 441:d2c15dda23c1 54 SpiHandle.Init.DataSize = obj->bits;
mbed_official 441:d2c15dda23c1 55 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 441:d2c15dda23c1 56 SpiHandle.Init.NSS = obj->nss;
mbed_official 441:d2c15dda23c1 57 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 441:d2c15dda23c1 58
mbed_official 441:d2c15dda23c1 59 HAL_SPI_Init(&SpiHandle);
mbed_official 441:d2c15dda23c1 60
mbed_official 441:d2c15dda23c1 61 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 441:d2c15dda23c1 62 }
mbed_official 441:d2c15dda23c1 63
mbed_official 630:825f75ca301e 64 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 441:d2c15dda23c1 65 // Determine the SPI to use
mbed_official 441:d2c15dda23c1 66 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 441:d2c15dda23c1 67 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 441:d2c15dda23c1 68 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 441:d2c15dda23c1 69 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 441:d2c15dda23c1 70
mbed_official 441:d2c15dda23c1 71 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 441:d2c15dda23c1 72 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 441:d2c15dda23c1 73
mbed_official 441:d2c15dda23c1 74 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 441:d2c15dda23c1 75 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 441:d2c15dda23c1 76
mbed_official 441:d2c15dda23c1 77 // Enable SPI clock
mbed_official 441:d2c15dda23c1 78 if (obj->spi == SPI_1) {
mbed_official 441:d2c15dda23c1 79 __SPI1_CLK_ENABLE();
mbed_official 441:d2c15dda23c1 80 }
mbed_official 630:825f75ca301e 81 #if defined(SPI2_BASE)
mbed_official 441:d2c15dda23c1 82 if (obj->spi == SPI_2) {
mbed_official 441:d2c15dda23c1 83 __SPI2_CLK_ENABLE();
mbed_official 441:d2c15dda23c1 84 }
mbed_official 630:825f75ca301e 85 #endif
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 630:825f75ca301e 112 void spi_free(spi_t *obj) {
mbed_official 441:d2c15dda23c1 113 // Reset SPI and disable clock
mbed_official 441:d2c15dda23c1 114 if (obj->spi == SPI_1) {
mbed_official 441:d2c15dda23c1 115 __SPI1_FORCE_RESET();
mbed_official 441:d2c15dda23c1 116 __SPI1_RELEASE_RESET();
mbed_official 441:d2c15dda23c1 117 __SPI1_CLK_DISABLE();
mbed_official 441:d2c15dda23c1 118 }
mbed_official 441:d2c15dda23c1 119
mbed_official 630:825f75ca301e 120 #if defined(SPI2_BASE)
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 630:825f75ca301e 126 #endif
mbed_official 441:d2c15dda23c1 127
mbed_official 441:d2c15dda23c1 128 // Configure GPIOs
mbed_official 441:d2c15dda23c1 129 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 441:d2c15dda23c1 130 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 441:d2c15dda23c1 131 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 441:d2c15dda23c1 132 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 441:d2c15dda23c1 133 }
mbed_official 441:d2c15dda23c1 134
mbed_official 630:825f75ca301e 135 void spi_format(spi_t *obj, int bits, int mode, int slave) {
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 630:825f75ca301e 171 void spi_frequency(spi_t *obj, int hz) {
mbed_official 441:d2c15dda23c1 172 // Note: The frequencies are obtained with SPI clock = 48 MHz (APB clock)
mbed_official 441:d2c15dda23c1 173 if (hz < 375000) {
mbed_official 441:d2c15dda23c1 174 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 188 kHz
mbed_official 441:d2c15dda23c1 175 } else if ((hz >= 375000) && (hz < 750000)) {
mbed_official 441:d2c15dda23c1 176 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
mbed_official 441:d2c15dda23c1 177 } else if ((hz >= 750000) && (hz < 1000000)) {
mbed_official 441:d2c15dda23c1 178 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 750 kHz
mbed_official 441:d2c15dda23c1 179 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 441:d2c15dda23c1 180 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz
mbed_official 441:d2c15dda23c1 181 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 441:d2c15dda23c1 182 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
mbed_official 441:d2c15dda23c1 183 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 441:d2c15dda23c1 184 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
mbed_official 441:d2c15dda23c1 185 } else if ((hz >= 12000000) && (hz < 24000000)) {
mbed_official 441:d2c15dda23c1 186 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
mbed_official 441:d2c15dda23c1 187 } else { // >= 24000000
mbed_official 441:d2c15dda23c1 188 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
mbed_official 441:d2c15dda23c1 189 }
mbed_official 441:d2c15dda23c1 190
mbed_official 441:d2c15dda23c1 191 init_spi(obj);
mbed_official 441:d2c15dda23c1 192 }
mbed_official 441:d2c15dda23c1 193
mbed_official 630:825f75ca301e 194 static inline int ssp_readable(spi_t *obj) {
mbed_official 441:d2c15dda23c1 195 int status;
mbed_official 441:d2c15dda23c1 196 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 197 // Check if data is received
mbed_official 441:d2c15dda23c1 198 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 441:d2c15dda23c1 199 return status;
mbed_official 441:d2c15dda23c1 200 }
mbed_official 441:d2c15dda23c1 201
mbed_official 630:825f75ca301e 202 static inline int ssp_writeable(spi_t *obj) {
mbed_official 441:d2c15dda23c1 203 int status;
mbed_official 441:d2c15dda23c1 204 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 205 // Check if data is transmitted
mbed_official 441:d2c15dda23c1 206 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 441:d2c15dda23c1 207 return status;
mbed_official 441:d2c15dda23c1 208 }
mbed_official 441:d2c15dda23c1 209
mbed_official 630:825f75ca301e 210 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 441:d2c15dda23c1 211 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 212 while (!ssp_writeable(obj));
mbed_official 441:d2c15dda23c1 213 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 441:d2c15dda23c1 214 // Force 8-bit access to the data register
mbed_official 441:d2c15dda23c1 215 uint8_t *p_spi_dr = 0;
mbed_official 441:d2c15dda23c1 216 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 441:d2c15dda23c1 217 *p_spi_dr = (uint8_t)value;
mbed_official 441:d2c15dda23c1 218 } else { // SPI_DATASIZE_16BIT
mbed_official 441:d2c15dda23c1 219 spi->DR = (uint16_t)value;
mbed_official 441:d2c15dda23c1 220 }
mbed_official 441:d2c15dda23c1 221 }
mbed_official 441:d2c15dda23c1 222
mbed_official 630:825f75ca301e 223 static inline int ssp_read(spi_t *obj) {
mbed_official 441:d2c15dda23c1 224 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 225 while (!ssp_readable(obj));
mbed_official 441:d2c15dda23c1 226 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 441:d2c15dda23c1 227 // Force 8-bit access to the data register
mbed_official 441:d2c15dda23c1 228 uint8_t *p_spi_dr = 0;
mbed_official 441:d2c15dda23c1 229 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 441:d2c15dda23c1 230 return (int)(*p_spi_dr);
mbed_official 441:d2c15dda23c1 231 } else {
mbed_official 441:d2c15dda23c1 232 return (int)spi->DR;
mbed_official 441:d2c15dda23c1 233 }
mbed_official 441:d2c15dda23c1 234 }
mbed_official 441:d2c15dda23c1 235
mbed_official 630:825f75ca301e 236 static inline int ssp_busy(spi_t *obj) {
mbed_official 441:d2c15dda23c1 237 int status;
mbed_official 441:d2c15dda23c1 238 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 239 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 441:d2c15dda23c1 240 return status;
mbed_official 441:d2c15dda23c1 241 }
mbed_official 441:d2c15dda23c1 242
mbed_official 630:825f75ca301e 243 int spi_master_write(spi_t *obj, int value) {
mbed_official 441:d2c15dda23c1 244 ssp_write(obj, value);
mbed_official 441:d2c15dda23c1 245 return ssp_read(obj);
mbed_official 441:d2c15dda23c1 246 }
mbed_official 441:d2c15dda23c1 247
mbed_official 630:825f75ca301e 248 int spi_slave_receive(spi_t *obj) {
mbed_official 441:d2c15dda23c1 249 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 441:d2c15dda23c1 250 };
mbed_official 441:d2c15dda23c1 251
mbed_official 630:825f75ca301e 252 int spi_slave_read(spi_t *obj) {
mbed_official 441:d2c15dda23c1 253 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 254 while (!ssp_readable(obj));
mbed_official 441:d2c15dda23c1 255 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 441:d2c15dda23c1 256 // Force 8-bit access to the data register
mbed_official 441:d2c15dda23c1 257 uint8_t *p_spi_dr = 0;
mbed_official 441:d2c15dda23c1 258 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 441:d2c15dda23c1 259 return (int)(*p_spi_dr);
mbed_official 441:d2c15dda23c1 260 } else {
mbed_official 441:d2c15dda23c1 261 return (int)spi->DR;
mbed_official 441:d2c15dda23c1 262 }
mbed_official 441:d2c15dda23c1 263 }
mbed_official 441:d2c15dda23c1 264
mbed_official 630:825f75ca301e 265 void spi_slave_write(spi_t *obj, int value) {
mbed_official 441:d2c15dda23c1 266 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 441:d2c15dda23c1 267 while (!ssp_writeable(obj));
mbed_official 441:d2c15dda23c1 268 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 441:d2c15dda23c1 269 // Force 8-bit access to the data register
mbed_official 441:d2c15dda23c1 270 uint8_t *p_spi_dr = 0;
mbed_official 441:d2c15dda23c1 271 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 441:d2c15dda23c1 272 *p_spi_dr = (uint8_t)value;
mbed_official 441:d2c15dda23c1 273 } else { // SPI_DATASIZE_16BIT
mbed_official 441:d2c15dda23c1 274 spi->DR = (uint16_t)value;
mbed_official 441:d2c15dda23c1 275 }
mbed_official 441:d2c15dda23c1 276 }
mbed_official 441:d2c15dda23c1 277
mbed_official 630:825f75ca301e 278 int spi_busy(spi_t *obj) {
mbed_official 441:d2c15dda23c1 279 return ssp_busy(obj);
mbed_official 441:d2c15dda23c1 280 }
mbed_official 441:d2c15dda23c1 281
mbed_official 441:d2c15dda23c1 282 #endif