shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_L053R8/spi_api.c@181:a4cbdfbbd2f4, 2014-05-07 (annotated)

Committer:
mbed_official
Date:
Wed May 07 13:15:08 2014 +0100
Revision:
181:a4cbdfbbd2f4
Child:
201:fa203361dc70
Synchronized with git revision 7751e759576c6fd68deccb81ea82bac19ed41745



Full URL: https://github.com/mbedmicro/mbed/commit/7751e759576c6fd68deccb81ea82bac19ed41745/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 181:a4cbdfbbd2f4 1 /* mbed Microcontroller Library
mbed_official 181:a4cbdfbbd2f4 2 *******************************************************************************
mbed_official 181:a4cbdfbbd2f4 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 181:a4cbdfbbd2f4 4 * All rights reserved.
mbed_official 181:a4cbdfbbd2f4 5 *
mbed_official 181:a4cbdfbbd2f4 6 * Redistribution and use in source and binary forms, with or without
mbed_official 181:a4cbdfbbd2f4 7 * modification, are permitted provided that the following conditions are met:
mbed_official 181:a4cbdfbbd2f4 8 *
mbed_official 181:a4cbdfbbd2f4 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 10 * this list of conditions and the following disclaimer.
mbed_official 181:a4cbdfbbd2f4 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 181:a4cbdfbbd2f4 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 181:a4cbdfbbd2f4 13 * and/or other materials provided with the distribution.
mbed_official 181:a4cbdfbbd2f4 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 181:a4cbdfbbd2f4 15 * may be used to endorse or promote products derived from this software
mbed_official 181:a4cbdfbbd2f4 16 * without specific prior written permission.
mbed_official 181:a4cbdfbbd2f4 17 *
mbed_official 181:a4cbdfbbd2f4 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 181:a4cbdfbbd2f4 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 181:a4cbdfbbd2f4 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 181:a4cbdfbbd2f4 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 181:a4cbdfbbd2f4 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 181:a4cbdfbbd2f4 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 181:a4cbdfbbd2f4 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 181:a4cbdfbbd2f4 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 181:a4cbdfbbd2f4 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 181:a4cbdfbbd2f4 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 181:a4cbdfbbd2f4 28 *******************************************************************************
mbed_official 181:a4cbdfbbd2f4 29 */
mbed_official 181:a4cbdfbbd2f4 30 #include "spi_api.h"
mbed_official 181:a4cbdfbbd2f4 31
mbed_official 181:a4cbdfbbd2f4 32 #if DEVICE_SPI
mbed_official 181:a4cbdfbbd2f4 33
mbed_official 181:a4cbdfbbd2f4 34 #include <math.h>
mbed_official 181:a4cbdfbbd2f4 35 #include "cmsis.h"
mbed_official 181:a4cbdfbbd2f4 36 #include "pinmap.h"
mbed_official 181:a4cbdfbbd2f4 37 #include "error.h"
mbed_official 181:a4cbdfbbd2f4 38
mbed_official 181:a4cbdfbbd2f4 39 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 181:a4cbdfbbd2f4 40 {PA_7, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 181:a4cbdfbbd2f4 41 {PA_12, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 181:a4cbdfbbd2f4 42 {PB_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 181:a4cbdfbbd2f4 43 {PB_15, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)},
mbed_official 181:a4cbdfbbd2f4 44 {PC_3, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_SPI2)},
mbed_official 181:a4cbdfbbd2f4 45 {NC, NC, 0}
mbed_official 181:a4cbdfbbd2f4 46 };
mbed_official 181:a4cbdfbbd2f4 47
mbed_official 181:a4cbdfbbd2f4 48 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 181:a4cbdfbbd2f4 49 {PA_6, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 181:a4cbdfbbd2f4 50 {PA_11, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 181:a4cbdfbbd2f4 51 {PB_4, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 181:a4cbdfbbd2f4 52 {PB_14, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)},
mbed_official 181:a4cbdfbbd2f4 53 {PC_2, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF2_SPI2)},
mbed_official 181:a4cbdfbbd2f4 54 {NC, NC, 0}
mbed_official 181:a4cbdfbbd2f4 55 };
mbed_official 181:a4cbdfbbd2f4 56
mbed_official 181:a4cbdfbbd2f4 57 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 181:a4cbdfbbd2f4 58 {PA_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 181:a4cbdfbbd2f4 59 {PB_3, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 181:a4cbdfbbd2f4 60 {PB_10, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 181:a4cbdfbbd2f4 61 {PB_13, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)},
mbed_official 181:a4cbdfbbd2f4 62 {NC, NC, 0}
mbed_official 181:a4cbdfbbd2f4 63 };
mbed_official 181:a4cbdfbbd2f4 64
mbed_official 181:a4cbdfbbd2f4 65 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 181:a4cbdfbbd2f4 66 {PA_4, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 181:a4cbdfbbd2f4 67 {PA_15, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 181:a4cbdfbbd2f4 68 {PB_9, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 181:a4cbdfbbd2f4 69 {PB_12, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)},
mbed_official 181:a4cbdfbbd2f4 70 {NC, NC, 0}
mbed_official 181:a4cbdfbbd2f4 71 };
mbed_official 181:a4cbdfbbd2f4 72
mbed_official 181:a4cbdfbbd2f4 73 static SPI_HandleTypeDef SpiHandle;
mbed_official 181:a4cbdfbbd2f4 74
mbed_official 181:a4cbdfbbd2f4 75 static void init_spi(spi_t *obj) {
mbed_official 181:a4cbdfbbd2f4 76 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 181:a4cbdfbbd2f4 77
mbed_official 181:a4cbdfbbd2f4 78 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 181:a4cbdfbbd2f4 79
mbed_official 181:a4cbdfbbd2f4 80 SpiHandle.Init.Mode = obj->mode;
mbed_official 181:a4cbdfbbd2f4 81 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 181:a4cbdfbbd2f4 82 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 181:a4cbdfbbd2f4 83 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 181:a4cbdfbbd2f4 84 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 181:a4cbdfbbd2f4 85 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 181:a4cbdfbbd2f4 86 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 181:a4cbdfbbd2f4 87 SpiHandle.Init.DataSize = obj->bits;
mbed_official 181:a4cbdfbbd2f4 88 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 181:a4cbdfbbd2f4 89 SpiHandle.Init.NSS = obj->nss;
mbed_official 181:a4cbdfbbd2f4 90 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 181:a4cbdfbbd2f4 91
mbed_official 181:a4cbdfbbd2f4 92 HAL_SPI_Init(&SpiHandle);
mbed_official 181:a4cbdfbbd2f4 93
mbed_official 181:a4cbdfbbd2f4 94 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 181:a4cbdfbbd2f4 95 }
mbed_official 181:a4cbdfbbd2f4 96
mbed_official 181:a4cbdfbbd2f4 97 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 181:a4cbdfbbd2f4 98 // Determine the SPI to use
mbed_official 181:a4cbdfbbd2f4 99 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 181:a4cbdfbbd2f4 100 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 181:a4cbdfbbd2f4 101 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 181:a4cbdfbbd2f4 102 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 181:a4cbdfbbd2f4 103
mbed_official 181:a4cbdfbbd2f4 104 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 181:a4cbdfbbd2f4 105 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 181:a4cbdfbbd2f4 106
mbed_official 181:a4cbdfbbd2f4 107 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 181:a4cbdfbbd2f4 108
mbed_official 181:a4cbdfbbd2f4 109 if (obj->spi == (SPIName)NC) {
mbed_official 181:a4cbdfbbd2f4 110 error("SPI error: pinout mapping failed.");
mbed_official 181:a4cbdfbbd2f4 111 }
mbed_official 181:a4cbdfbbd2f4 112
mbed_official 181:a4cbdfbbd2f4 113 // Enable SPI clock
mbed_official 181:a4cbdfbbd2f4 114 if (obj->spi == SPI_1) {
mbed_official 181:a4cbdfbbd2f4 115 __SPI1_CLK_ENABLE();
mbed_official 181:a4cbdfbbd2f4 116 }
mbed_official 181:a4cbdfbbd2f4 117 if (obj->spi == SPI_2) {
mbed_official 181:a4cbdfbbd2f4 118 __SPI2_CLK_ENABLE();
mbed_official 181:a4cbdfbbd2f4 119 }
mbed_official 181:a4cbdfbbd2f4 120
mbed_official 181:a4cbdfbbd2f4 121 // Configure the SPI pins
mbed_official 181:a4cbdfbbd2f4 122 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 181:a4cbdfbbd2f4 123 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 181:a4cbdfbbd2f4 124 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 181:a4cbdfbbd2f4 125
mbed_official 181:a4cbdfbbd2f4 126 // Save new values
mbed_official 181:a4cbdfbbd2f4 127 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 181:a4cbdfbbd2f4 128 obj->cpol = SPI_POLARITY_LOW;
mbed_official 181:a4cbdfbbd2f4 129 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 181:a4cbdfbbd2f4 130 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 181:a4cbdfbbd2f4 131
mbed_official 181:a4cbdfbbd2f4 132 if (ssel == NC) { // SW NSS Master mode
mbed_official 181:a4cbdfbbd2f4 133 obj->mode = SPI_MODE_MASTER;
mbed_official 181:a4cbdfbbd2f4 134 obj->nss = SPI_NSS_SOFT;
mbed_official 181:a4cbdfbbd2f4 135 } else { // Slave
mbed_official 181:a4cbdfbbd2f4 136 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 181:a4cbdfbbd2f4 137 obj->mode = SPI_MODE_SLAVE;
mbed_official 181:a4cbdfbbd2f4 138 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 181:a4cbdfbbd2f4 139 }
mbed_official 181:a4cbdfbbd2f4 140
mbed_official 181:a4cbdfbbd2f4 141 init_spi(obj);
mbed_official 181:a4cbdfbbd2f4 142 }
mbed_official 181:a4cbdfbbd2f4 143
mbed_official 181:a4cbdfbbd2f4 144 void spi_free(spi_t *obj) {
mbed_official 181:a4cbdfbbd2f4 145 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 181:a4cbdfbbd2f4 146 HAL_SPI_DeInit(&SpiHandle);
mbed_official 181:a4cbdfbbd2f4 147 }
mbed_official 181:a4cbdfbbd2f4 148
mbed_official 181:a4cbdfbbd2f4 149 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 181:a4cbdfbbd2f4 150 // Save new values
mbed_official 181:a4cbdfbbd2f4 151 if (bits == 8) {
mbed_official 181:a4cbdfbbd2f4 152 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 181:a4cbdfbbd2f4 153 } else {
mbed_official 181:a4cbdfbbd2f4 154 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 181:a4cbdfbbd2f4 155 }
mbed_official 181:a4cbdfbbd2f4 156
mbed_official 181:a4cbdfbbd2f4 157 switch (mode) {
mbed_official 181:a4cbdfbbd2f4 158 case 0:
mbed_official 181:a4cbdfbbd2f4 159 obj->cpol = SPI_POLARITY_LOW;
mbed_official 181:a4cbdfbbd2f4 160 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 181:a4cbdfbbd2f4 161 break;
mbed_official 181:a4cbdfbbd2f4 162 case 1:
mbed_official 181:a4cbdfbbd2f4 163 obj->cpol = SPI_POLARITY_LOW;
mbed_official 181:a4cbdfbbd2f4 164 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 181:a4cbdfbbd2f4 165 break;
mbed_official 181:a4cbdfbbd2f4 166 case 2:
mbed_official 181:a4cbdfbbd2f4 167 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 181:a4cbdfbbd2f4 168 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 181:a4cbdfbbd2f4 169 break;
mbed_official 181:a4cbdfbbd2f4 170 default:
mbed_official 181:a4cbdfbbd2f4 171 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 181:a4cbdfbbd2f4 172 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 181:a4cbdfbbd2f4 173 break;
mbed_official 181:a4cbdfbbd2f4 174 }
mbed_official 181:a4cbdfbbd2f4 175
mbed_official 181:a4cbdfbbd2f4 176 if (slave == 0) {
mbed_official 181:a4cbdfbbd2f4 177 obj->mode = SPI_MODE_MASTER;
mbed_official 181:a4cbdfbbd2f4 178 obj->nss = SPI_NSS_SOFT;
mbed_official 181:a4cbdfbbd2f4 179 } else {
mbed_official 181:a4cbdfbbd2f4 180 obj->mode = SPI_MODE_SLAVE;
mbed_official 181:a4cbdfbbd2f4 181 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 181:a4cbdfbbd2f4 182 }
mbed_official 181:a4cbdfbbd2f4 183
mbed_official 181:a4cbdfbbd2f4 184 init_spi(obj);
mbed_official 181:a4cbdfbbd2f4 185 }
mbed_official 181:a4cbdfbbd2f4 186
mbed_official 181:a4cbdfbbd2f4 187 void spi_frequency(spi_t *obj, int hz) {
mbed_official 181:a4cbdfbbd2f4 188 // Note: The frequencies are obtained with SPI1 clock = 32 MHz (APB2 clock)
mbed_official 181:a4cbdfbbd2f4 189 if (hz < 250000) {
mbed_official 181:a4cbdfbbd2f4 190 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 125 kHz
mbed_official 181:a4cbdfbbd2f4 191 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 181:a4cbdfbbd2f4 192 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 250 kHz
mbed_official 181:a4cbdfbbd2f4 193 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 181:a4cbdfbbd2f4 194 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 500 kHz
mbed_official 181:a4cbdfbbd2f4 195 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 181:a4cbdfbbd2f4 196 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz
mbed_official 181:a4cbdfbbd2f4 197 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 181:a4cbdfbbd2f4 198 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2 MHz
mbed_official 181:a4cbdfbbd2f4 199 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 181:a4cbdfbbd2f4 200 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 4 MHz
mbed_official 181:a4cbdfbbd2f4 201 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 181:a4cbdfbbd2f4 202 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 8 MHz
mbed_official 181:a4cbdfbbd2f4 203 } else { // >= 16000000
mbed_official 181:a4cbdfbbd2f4 204 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 16 MHz
mbed_official 181:a4cbdfbbd2f4 205 }
mbed_official 181:a4cbdfbbd2f4 206 init_spi(obj);
mbed_official 181:a4cbdfbbd2f4 207 }
mbed_official 181:a4cbdfbbd2f4 208
mbed_official 181:a4cbdfbbd2f4 209 static inline int ssp_readable(spi_t *obj) {
mbed_official 181:a4cbdfbbd2f4 210 int status;
mbed_official 181:a4cbdfbbd2f4 211 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 181:a4cbdfbbd2f4 212 // Check if data is received
mbed_official 181:a4cbdfbbd2f4 213 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 181:a4cbdfbbd2f4 214 return status;
mbed_official 181:a4cbdfbbd2f4 215 }
mbed_official 181:a4cbdfbbd2f4 216
mbed_official 181:a4cbdfbbd2f4 217 static inline int ssp_writeable(spi_t *obj) {
mbed_official 181:a4cbdfbbd2f4 218 int status;
mbed_official 181:a4cbdfbbd2f4 219 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 181:a4cbdfbbd2f4 220 // Check if data is transmitted
mbed_official 181:a4cbdfbbd2f4 221 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 181:a4cbdfbbd2f4 222 return status;
mbed_official 181:a4cbdfbbd2f4 223 }
mbed_official 181:a4cbdfbbd2f4 224
mbed_official 181:a4cbdfbbd2f4 225 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 181:a4cbdfbbd2f4 226 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 181:a4cbdfbbd2f4 227 while (!ssp_writeable(obj));
mbed_official 181:a4cbdfbbd2f4 228 spi->DR = (uint16_t)value;
mbed_official 181:a4cbdfbbd2f4 229 }
mbed_official 181:a4cbdfbbd2f4 230
mbed_official 181:a4cbdfbbd2f4 231 static inline int ssp_read(spi_t *obj) {
mbed_official 181:a4cbdfbbd2f4 232 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 181:a4cbdfbbd2f4 233 while (!ssp_readable(obj));
mbed_official 181:a4cbdfbbd2f4 234 return (int)spi->DR;
mbed_official 181:a4cbdfbbd2f4 235 }
mbed_official 181:a4cbdfbbd2f4 236
mbed_official 181:a4cbdfbbd2f4 237 static inline int ssp_busy(spi_t *obj) {
mbed_official 181:a4cbdfbbd2f4 238 int status;
mbed_official 181:a4cbdfbbd2f4 239 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 181:a4cbdfbbd2f4 240 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 181:a4cbdfbbd2f4 241 return status;
mbed_official 181:a4cbdfbbd2f4 242 }
mbed_official 181:a4cbdfbbd2f4 243
mbed_official 181:a4cbdfbbd2f4 244 int spi_master_write(spi_t *obj, int value) {
mbed_official 181:a4cbdfbbd2f4 245 ssp_write(obj, value);
mbed_official 181:a4cbdfbbd2f4 246 return ssp_read(obj);
mbed_official 181:a4cbdfbbd2f4 247 }
mbed_official 181:a4cbdfbbd2f4 248
mbed_official 181:a4cbdfbbd2f4 249 int spi_slave_receive(spi_t *obj) {
mbed_official 181:a4cbdfbbd2f4 250 return (!ssp_busy(obj)) ? (1) : (0);
mbed_official 181:a4cbdfbbd2f4 251 };
mbed_official 181:a4cbdfbbd2f4 252
mbed_official 181:a4cbdfbbd2f4 253 int spi_slave_read(spi_t *obj) {
mbed_official 181:a4cbdfbbd2f4 254 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 181:a4cbdfbbd2f4 255 while (!ssp_readable(obj));
mbed_official 181:a4cbdfbbd2f4 256 return (int)spi->DR;
mbed_official 181:a4cbdfbbd2f4 257 }
mbed_official 181:a4cbdfbbd2f4 258
mbed_official 181:a4cbdfbbd2f4 259 void spi_slave_write(spi_t *obj, int value) {
mbed_official 181:a4cbdfbbd2f4 260 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 181:a4cbdfbbd2f4 261 while (!ssp_writeable(obj));
mbed_official 181:a4cbdfbbd2f4 262 spi->DR = (uint16_t)value;
mbed_official 181:a4cbdfbbd2f4 263 }
mbed_official 181:a4cbdfbbd2f4 264
mbed_official 181:a4cbdfbbd2f4 265 int spi_busy(spi_t *obj) {
mbed_official 181:a4cbdfbbd2f4 266 return ssp_busy(obj);
mbed_official 181:a4cbdfbbd2f4 267 }
mbed_official 181:a4cbdfbbd2f4 268
mbed_official 181:a4cbdfbbd2f4 269 #endif