DongEun Koak / mbed-src

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targets/hal/TARGET_STM/TARGET_STM32L1/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:
496:543871686697 
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 76:aeb1df146756 1 /* mbed Microcontroller Library
mbed_official 76:aeb1df146756 2 *******************************************************************************
mbed_official 76:aeb1df146756 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 76:aeb1df146756 4 * All rights reserved.
mbed_official 76:aeb1df146756 5 *
mbed_official 76:aeb1df146756 6 * Redistribution and use in source and binary forms, with or without
mbed_official 76:aeb1df146756 7 * modification, are permitted provided that the following conditions are met:
mbed_official 76:aeb1df146756 8 *
mbed_official 76:aeb1df146756 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 76:aeb1df146756 10 * this list of conditions and the following disclaimer.
mbed_official 76:aeb1df146756 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 76:aeb1df146756 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 76:aeb1df146756 13 * and/or other materials provided with the distribution.
mbed_official 76:aeb1df146756 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 76:aeb1df146756 15 * may be used to endorse or promote products derived from this software
mbed_official 76:aeb1df146756 16 * without specific prior written permission.
mbed_official 76:aeb1df146756 17 *
mbed_official 76:aeb1df146756 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 76:aeb1df146756 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 76:aeb1df146756 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 76:aeb1df146756 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 76:aeb1df146756 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 76:aeb1df146756 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 76:aeb1df146756 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 76:aeb1df146756 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 76:aeb1df146756 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 76:aeb1df146756 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 76:aeb1df146756 28 *******************************************************************************
mbed_official 76:aeb1df146756 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 76:aeb1df146756 31 #include "spi_api.h"
mbed_official 76:aeb1df146756 32
mbed_official 76:aeb1df146756 33 #if DEVICE_SPI
mbed_official 76:aeb1df146756 34
mbed_official 76:aeb1df146756 35 #include <math.h>
mbed_official 76:aeb1df146756 36 #include "cmsis.h"
mbed_official 76:aeb1df146756 37 #include "pinmap.h"
mbed_official 414:4ec4c5b614b0 38 #include "PeripheralPins.h"
mbed_official 76:aeb1df146756 39
mbed_official 354:e67efb2aab0e 40 static SPI_HandleTypeDef SpiHandle;
mbed_official 76:aeb1df146756 41
mbed_official 354:e67efb2aab0e 42 static void init_spi(spi_t *obj)
mbed_official 354:e67efb2aab0e 43 {
mbed_official 354:e67efb2aab0e 44 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 354:e67efb2aab0e 45
mbed_official 354:e67efb2aab0e 46 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 76:aeb1df146756 47
mbed_official 354:e67efb2aab0e 48 SpiHandle.Init.Mode = obj->mode;
mbed_official 354:e67efb2aab0e 49 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 354:e67efb2aab0e 50 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 354:e67efb2aab0e 51 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 354:e67efb2aab0e 52 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 354:e67efb2aab0e 53 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 354:e67efb2aab0e 54 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 354:e67efb2aab0e 55 SpiHandle.Init.DataSize = obj->bits;
mbed_official 354:e67efb2aab0e 56 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 354:e67efb2aab0e 57 SpiHandle.Init.NSS = obj->nss;
mbed_official 354:e67efb2aab0e 58 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 76:aeb1df146756 59
mbed_official 354:e67efb2aab0e 60 HAL_SPI_Init(&SpiHandle);
mbed_official 354:e67efb2aab0e 61
mbed_official 354:e67efb2aab0e 62 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 76:aeb1df146756 63 }
mbed_official 76:aeb1df146756 64
mbed_official 354:e67efb2aab0e 65 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 354:e67efb2aab0e 66 {
mbed_official 76:aeb1df146756 67 // Determine the SPI to use
mbed_official 76:aeb1df146756 68 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 76:aeb1df146756 69 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 76:aeb1df146756 70 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 76:aeb1df146756 71 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 174:8bb9f3a33240 72
mbed_official 76:aeb1df146756 73 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 76:aeb1df146756 74 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 174:8bb9f3a33240 75
mbed_official 76:aeb1df146756 76 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 227:7bd0639b8911 77 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 174:8bb9f3a33240 78
mbed_official 76:aeb1df146756 79 // Enable SPI clock
mbed_official 76:aeb1df146756 80 if (obj->spi == SPI_1) {
mbed_official 354:e67efb2aab0e 81 __SPI1_CLK_ENABLE();
mbed_official 76:aeb1df146756 82 }
mbed_official 76:aeb1df146756 83 if (obj->spi == SPI_2) {
mbed_official 354:e67efb2aab0e 84 __SPI2_CLK_ENABLE();
mbed_official 76:aeb1df146756 85 }
mbed_official 118:b44c45162f28 86 if (obj->spi == SPI_3) {
mbed_official 354:e67efb2aab0e 87 __SPI3_CLK_ENABLE();
mbed_official 118:b44c45162f28 88 }
mbed_official 174:8bb9f3a33240 89
mbed_official 76:aeb1df146756 90 // Configure the SPI pins
mbed_official 76:aeb1df146756 91 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 76:aeb1df146756 92 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 76:aeb1df146756 93 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 174:8bb9f3a33240 94
mbed_official 76:aeb1df146756 95 // Save new values
mbed_official 354:e67efb2aab0e 96 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 354:e67efb2aab0e 97 obj->cpol = SPI_POLARITY_LOW;
mbed_official 354:e67efb2aab0e 98 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 354:e67efb2aab0e 99 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 174:8bb9f3a33240 100
mbed_official 215:83cf97a28428 101 obj->pin_miso = miso;
mbed_official 215:83cf97a28428 102 obj->pin_mosi = mosi;
mbed_official 215:83cf97a28428 103 obj->pin_sclk = sclk;
mbed_official 215:83cf97a28428 104 obj->pin_ssel = ssel;
mbed_official 215:83cf97a28428 105
mbed_official 552:a1b9575155a3 106 if (ssel != NC) {
mbed_official 552:a1b9575155a3 107 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 552:a1b9575155a3 108 } else {
mbed_official 354:e67efb2aab0e 109 obj->nss = SPI_NSS_SOFT;
mbed_official 76:aeb1df146756 110 }
mbed_official 76:aeb1df146756 111
mbed_official 76:aeb1df146756 112 init_spi(obj);
mbed_official 76:aeb1df146756 113 }
mbed_official 76:aeb1df146756 114
mbed_official 354:e67efb2aab0e 115 void spi_free(spi_t *obj)
mbed_official 354:e67efb2aab0e 116 {
mbed_official 215:83cf97a28428 117 // Reset SPI and disable clock
mbed_official 215:83cf97a28428 118 if (obj->spi == SPI_1) {
mbed_official 354:e67efb2aab0e 119 __SPI1_FORCE_RESET();
mbed_official 354:e67efb2aab0e 120 __SPI1_RELEASE_RESET();
mbed_official 354:e67efb2aab0e 121 __SPI1_CLK_DISABLE();
mbed_official 215:83cf97a28428 122 }
mbed_official 215:83cf97a28428 123
mbed_official 215:83cf97a28428 124 if (obj->spi == SPI_2) {
mbed_official 354:e67efb2aab0e 125 __SPI2_FORCE_RESET();
mbed_official 354:e67efb2aab0e 126 __SPI2_RELEASE_RESET();
mbed_official 354:e67efb2aab0e 127 __SPI2_CLK_DISABLE();
mbed_official 215:83cf97a28428 128 }
mbed_official 215:83cf97a28428 129
mbed_official 215:83cf97a28428 130 if (obj->spi == SPI_3) {
mbed_official 354:e67efb2aab0e 131 __SPI3_FORCE_RESET();
mbed_official 354:e67efb2aab0e 132 __SPI3_RELEASE_RESET();
mbed_official 354:e67efb2aab0e 133 __SPI3_CLK_DISABLE();
mbed_official 215:83cf97a28428 134 }
mbed_official 215:83cf97a28428 135
mbed_official 354:e67efb2aab0e 136 // Configure GPIO
mbed_official 354:e67efb2aab0e 137 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 354:e67efb2aab0e 138 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 354:e67efb2aab0e 139 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 354:e67efb2aab0e 140 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 76:aeb1df146756 141 }
mbed_official 76:aeb1df146756 142
mbed_official 354:e67efb2aab0e 143 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 354:e67efb2aab0e 144 {
mbed_official 76:aeb1df146756 145 // Save new values
mbed_official 233:1bbc1451db33 146 if (bits == 16) {
mbed_official 354:e67efb2aab0e 147 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 233:1bbc1451db33 148 } else {
mbed_official 354:e67efb2aab0e 149 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 76:aeb1df146756 150 }
mbed_official 174:8bb9f3a33240 151
mbed_official 76:aeb1df146756 152 switch (mode) {
mbed_official 76:aeb1df146756 153 case 0:
mbed_official 354:e67efb2aab0e 154 obj->cpol = SPI_POLARITY_LOW;
mbed_official 354:e67efb2aab0e 155 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 174:8bb9f3a33240 156 break;
mbed_official 76:aeb1df146756 157 case 1:
mbed_official 354:e67efb2aab0e 158 obj->cpol = SPI_POLARITY_LOW;
mbed_official 354:e67efb2aab0e 159 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 174:8bb9f3a33240 160 break;
mbed_official 76:aeb1df146756 161 case 2:
mbed_official 354:e67efb2aab0e 162 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 354:e67efb2aab0e 163 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 174:8bb9f3a33240 164 break;
mbed_official 76:aeb1df146756 165 default:
mbed_official 354:e67efb2aab0e 166 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 354:e67efb2aab0e 167 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 174:8bb9f3a33240 168 break;
mbed_official 76:aeb1df146756 169 }
mbed_official 174:8bb9f3a33240 170
mbed_official 552:a1b9575155a3 171 if (obj->nss != SPI_NSS_SOFT) {
mbed_official 552:a1b9575155a3 172 obj->nss = (slave) ? SPI_NSS_HARD_INPUT : SPI_NSS_HARD_OUTPUT;
mbed_official 76:aeb1df146756 173 }
mbed_official 174:8bb9f3a33240 174
mbed_official 552:a1b9575155a3 175 obj->mode = (slave) ? SPI_MODE_SLAVE : SPI_MODE_MASTER;
mbed_official 552:a1b9575155a3 176
mbed_official 76:aeb1df146756 177 init_spi(obj);
mbed_official 76:aeb1df146756 178 }
mbed_official 76:aeb1df146756 179
mbed_official 354:e67efb2aab0e 180 void spi_frequency(spi_t *obj, int hz)
mbed_official 354:e67efb2aab0e 181 {
mbed_official 139:e3413eddde57 182 // Values depend of PCLK1 and PCLK2: 32 MHz if HSI is used, 24 MHz if HSE is used
mbed_official 139:e3413eddde57 183 if (SystemCoreClock == 32000000) { // HSI
mbed_official 139:e3413eddde57 184 if (hz < 250000) {
mbed_official 354:e67efb2aab0e 185 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 125 kHz
mbed_official 174:8bb9f3a33240 186 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 354:e67efb2aab0e 187 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 250 kHz
mbed_official 174:8bb9f3a33240 188 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 354:e67efb2aab0e 189 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 500 kHz
mbed_official 174:8bb9f3a33240 190 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 354:e67efb2aab0e 191 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz
mbed_official 174:8bb9f3a33240 192 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 354:e67efb2aab0e 193 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2 MHz
mbed_official 174:8bb9f3a33240 194 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 354:e67efb2aab0e 195 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 4 MHz
mbed_official 174:8bb9f3a33240 196 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 354:e67efb2aab0e 197 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 8 MHz
mbed_official 174:8bb9f3a33240 198 } else { // >= 16000000
mbed_official 354:e67efb2aab0e 199 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 16 MHz
mbed_official 139:e3413eddde57 200 }
mbed_official 174:8bb9f3a33240 201 } else { // 24 MHz - HSE
mbed_official 139:e3413eddde57 202 if (hz < 180000) {
mbed_official 354:e67efb2aab0e 203 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 94 kHz
mbed_official 174:8bb9f3a33240 204 } else if ((hz >= 180000) && (hz < 350000)) {
mbed_official 354:e67efb2aab0e 205 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 188 kHz
mbed_official 174:8bb9f3a33240 206 } else if ((hz >= 350000) && (hz < 750000)) {
mbed_official 354:e67efb2aab0e 207 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 375 kHz
mbed_official 174:8bb9f3a33240 208 } else if ((hz >= 750000) && (hz < 1000000)) {
mbed_official 354:e67efb2aab0e 209 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 750 kHz
mbed_official 174:8bb9f3a33240 210 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 354:e67efb2aab0e 211 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 1.5 MHz
mbed_official 174:8bb9f3a33240 212 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 354:e67efb2aab0e 213 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 3 MHz
mbed_official 174:8bb9f3a33240 214 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 354:e67efb2aab0e 215 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 6 MHz
mbed_official 174:8bb9f3a33240 216 } else { // >= 12000000
mbed_official 354:e67efb2aab0e 217 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 12 MHz
mbed_official 139:e3413eddde57 218 }
mbed_official 129:0182c99221bc 219 }
mbed_official 76:aeb1df146756 220 init_spi(obj);
mbed_official 76:aeb1df146756 221 }
mbed_official 76:aeb1df146756 222
mbed_official 354:e67efb2aab0e 223 static inline int ssp_readable(spi_t *obj)
mbed_official 354:e67efb2aab0e 224 {
mbed_official 76:aeb1df146756 225 int status;
mbed_official 354:e67efb2aab0e 226 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 227 // Check if data is received
mbed_official 354:e67efb2aab0e 228 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 174:8bb9f3a33240 229 return status;
mbed_official 76:aeb1df146756 230 }
mbed_official 76:aeb1df146756 231
mbed_official 354:e67efb2aab0e 232 static inline int ssp_writeable(spi_t *obj)
mbed_official 354:e67efb2aab0e 233 {
mbed_official 76:aeb1df146756 234 int status;
mbed_official 354:e67efb2aab0e 235 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 236 // Check if data is transmitted
mbed_official 354:e67efb2aab0e 237 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 238 return status;
mbed_official 76:aeb1df146756 239 }
mbed_official 76:aeb1df146756 240
mbed_official 354:e67efb2aab0e 241 static inline void ssp_write(spi_t *obj, int value)
mbed_official 354:e67efb2aab0e 242 {
mbed_official 174:8bb9f3a33240 243 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 244 while (!ssp_writeable(obj));
mbed_official 354:e67efb2aab0e 245 spi->DR = (uint16_t)value;
mbed_official 76:aeb1df146756 246 }
mbed_official 76:aeb1df146756 247
mbed_official 354:e67efb2aab0e 248 static inline int ssp_read(spi_t *obj)
mbed_official 354:e67efb2aab0e 249 {
mbed_official 174:8bb9f3a33240 250 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 251 while (!ssp_readable(obj));
mbed_official 354:e67efb2aab0e 252 return (int)spi->DR;
mbed_official 76:aeb1df146756 253 }
mbed_official 76:aeb1df146756 254
mbed_official 354:e67efb2aab0e 255 static inline int ssp_busy(spi_t *obj)
mbed_official 354:e67efb2aab0e 256 {
mbed_official 76:aeb1df146756 257 int status;
mbed_official 354:e67efb2aab0e 258 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 354:e67efb2aab0e 259 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 260 return status;
mbed_official 76:aeb1df146756 261 }
mbed_official 76:aeb1df146756 262
mbed_official 354:e67efb2aab0e 263 int spi_master_write(spi_t *obj, int value)
mbed_official 354:e67efb2aab0e 264 {
mbed_official 76:aeb1df146756 265 ssp_write(obj, value);
mbed_official 76:aeb1df146756 266 return ssp_read(obj);
mbed_official 76:aeb1df146756 267 }
mbed_official 76:aeb1df146756 268
mbed_official 354:e67efb2aab0e 269 int spi_slave_receive(spi_t *obj)
mbed_official 354:e67efb2aab0e 270 {
mbed_official 233:1bbc1451db33 271 return (ssp_readable(obj) ? 1 : 0);
mbed_official 76:aeb1df146756 272 };
mbed_official 76:aeb1df146756 273
mbed_official 354:e67efb2aab0e 274 int spi_slave_read(spi_t *obj)
mbed_official 354:e67efb2aab0e 275 {
mbed_official 76:aeb1df146756 276 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 354:e67efb2aab0e 277 while (!ssp_readable(obj));
mbed_official 354:e67efb2aab0e 278 return (int)spi->DR;
mbed_official 76:aeb1df146756 279 }
mbed_official 76:aeb1df146756 280
mbed_official 354:e67efb2aab0e 281 void spi_slave_write(spi_t *obj, int value)
mbed_official 354:e67efb2aab0e 282 {
mbed_official 174:8bb9f3a33240 283 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 174:8bb9f3a33240 284 while (!ssp_writeable(obj));
mbed_official 354:e67efb2aab0e 285 spi->DR = (uint16_t)value;
mbed_official 76:aeb1df146756 286 }
mbed_official 76:aeb1df146756 287
mbed_official 354:e67efb2aab0e 288 int spi_busy(spi_t *obj)
mbed_official 354:e67efb2aab0e 289 {
mbed_official 76:aeb1df146756 290 return ssp_busy(obj);
mbed_official 76:aeb1df146756 291 }
mbed_official 76:aeb1df146756 292
mbed_official 76:aeb1df146756 293 #endif