Adam Kucybala / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F072RB/spi_api.c@219:993c9b0acbcc, 2014-06-02 (annotated)

Committer:
mbed_official
Date:
Mon Jun 02 09:45:07 2014 +0100
Revision:
219:993c9b0acbcc
Synchronized with git revision cd741909614c52b886d34bad5007da2057c1a185



Full URL: https://github.com/mbedmicro/mbed/commit/cd741909614c52b886d34bad5007da2057c1a185/



[NUCLEO_F072RB] Add HAL files

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 219:993c9b0acbcc 1 /* mbed Microcontroller Library
mbed_official 219:993c9b0acbcc 2 *******************************************************************************
mbed_official 219:993c9b0acbcc 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 219:993c9b0acbcc 4 * All rights reserved.
mbed_official 219:993c9b0acbcc 5 *
mbed_official 219:993c9b0acbcc 6 * Redistribution and use in source and binary forms, with or without
mbed_official 219:993c9b0acbcc 7 * modification, are permitted provided that the following conditions are met:
mbed_official 219:993c9b0acbcc 8 *
mbed_official 219:993c9b0acbcc 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 219:993c9b0acbcc 10 * this list of conditions and the following disclaimer.
mbed_official 219:993c9b0acbcc 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 219:993c9b0acbcc 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 219:993c9b0acbcc 13 * and/or other materials provided with the distribution.
mbed_official 219:993c9b0acbcc 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 219:993c9b0acbcc 15 * may be used to endorse or promote products derived from this software
mbed_official 219:993c9b0acbcc 16 * without specific prior written permission.
mbed_official 219:993c9b0acbcc 17 *
mbed_official 219:993c9b0acbcc 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 219:993c9b0acbcc 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 219:993c9b0acbcc 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 219:993c9b0acbcc 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 219:993c9b0acbcc 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 219:993c9b0acbcc 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 219:993c9b0acbcc 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 219:993c9b0acbcc 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 219:993c9b0acbcc 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 219:993c9b0acbcc 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 219:993c9b0acbcc 28 *******************************************************************************
mbed_official 219:993c9b0acbcc 29 */
mbed_official 219:993c9b0acbcc 30 #include "spi_api.h"
mbed_official 219:993c9b0acbcc 31
mbed_official 219:993c9b0acbcc 32 #if DEVICE_SPI
mbed_official 219:993c9b0acbcc 33
mbed_official 219:993c9b0acbcc 34 #include <math.h>
mbed_official 219:993c9b0acbcc 35 #include "cmsis.h"
mbed_official 219:993c9b0acbcc 36 #include "pinmap.h"
mbed_official 219:993c9b0acbcc 37 #include "error.h"
mbed_official 219:993c9b0acbcc 38
mbed_official 219:993c9b0acbcc 39 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 219:993c9b0acbcc 40 {PA_7, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 41 {PB_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 42 {PB_15, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)},
mbed_official 219:993c9b0acbcc 43 {PC_3, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_SPI2)},
mbed_official 219:993c9b0acbcc 44 {NC, NC, 0}
mbed_official 219:993c9b0acbcc 45 };
mbed_official 219:993c9b0acbcc 46
mbed_official 219:993c9b0acbcc 47 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 219:993c9b0acbcc 48 {PA_6, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 49 {PB_4, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 50 {PB_14, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)},
mbed_official 219:993c9b0acbcc 51 {PC_2, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_SPI2)},
mbed_official 219:993c9b0acbcc 52 {NC, NC, 0}
mbed_official 219:993c9b0acbcc 53 };
mbed_official 219:993c9b0acbcc 54
mbed_official 219:993c9b0acbcc 55 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 219:993c9b0acbcc 56 {PA_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 57 {PB_3, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 58 {PB_10, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 219:993c9b0acbcc 59 {PB_13, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)},
mbed_official 219:993c9b0acbcc 60 {NC, NC, 0}
mbed_official 219:993c9b0acbcc 61 };
mbed_official 219:993c9b0acbcc 62
mbed_official 219:993c9b0acbcc 63 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 219:993c9b0acbcc 64 {PA_4, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 65 {PA_15, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI1)},
mbed_official 219:993c9b0acbcc 66 {PB_9, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 219:993c9b0acbcc 67 {PB_12, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF0_SPI2)},
mbed_official 219:993c9b0acbcc 68 {NC, NC, 0}
mbed_official 219:993c9b0acbcc 69 };
mbed_official 219:993c9b0acbcc 70
mbed_official 219:993c9b0acbcc 71 static SPI_HandleTypeDef SpiHandle;
mbed_official 219:993c9b0acbcc 72
mbed_official 219:993c9b0acbcc 73 static void init_spi(spi_t *obj) {
mbed_official 219:993c9b0acbcc 74 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 75
mbed_official 219:993c9b0acbcc 76 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 219:993c9b0acbcc 77
mbed_official 219:993c9b0acbcc 78 SpiHandle.Init.Mode = obj->mode;
mbed_official 219:993c9b0acbcc 79 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 219:993c9b0acbcc 80 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 219:993c9b0acbcc 81 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 219:993c9b0acbcc 82 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 219:993c9b0acbcc 83 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 219:993c9b0acbcc 84 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 219:993c9b0acbcc 85 SpiHandle.Init.DataSize = obj->bits;
mbed_official 219:993c9b0acbcc 86 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 219:993c9b0acbcc 87 SpiHandle.Init.NSS = obj->nss;
mbed_official 219:993c9b0acbcc 88 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 219:993c9b0acbcc 89
mbed_official 219:993c9b0acbcc 90 HAL_SPI_Init(&SpiHandle);
mbed_official 219:993c9b0acbcc 91
mbed_official 219:993c9b0acbcc 92 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 219:993c9b0acbcc 93 }
mbed_official 219:993c9b0acbcc 94
mbed_official 219:993c9b0acbcc 95 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 219:993c9b0acbcc 96 // Determine the SPI to use
mbed_official 219:993c9b0acbcc 97 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 219:993c9b0acbcc 98 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 219:993c9b0acbcc 99 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 219:993c9b0acbcc 100 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 219:993c9b0acbcc 101
mbed_official 219:993c9b0acbcc 102 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 219:993c9b0acbcc 103 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 219:993c9b0acbcc 104
mbed_official 219:993c9b0acbcc 105 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 219:993c9b0acbcc 106
mbed_official 219:993c9b0acbcc 107 if (obj->spi == (SPIName)NC) {
mbed_official 219:993c9b0acbcc 108 error("SPI error: pinout mapping failed.");
mbed_official 219:993c9b0acbcc 109 }
mbed_official 219:993c9b0acbcc 110
mbed_official 219:993c9b0acbcc 111 // Enable SPI clock
mbed_official 219:993c9b0acbcc 112 if (obj->spi == SPI_1) {
mbed_official 219:993c9b0acbcc 113 __SPI1_CLK_ENABLE();
mbed_official 219:993c9b0acbcc 114 }
mbed_official 219:993c9b0acbcc 115 if (obj->spi == SPI_2) {
mbed_official 219:993c9b0acbcc 116 __SPI2_CLK_ENABLE();
mbed_official 219:993c9b0acbcc 117 }
mbed_official 219:993c9b0acbcc 118
mbed_official 219:993c9b0acbcc 119 // Configure the SPI pins
mbed_official 219:993c9b0acbcc 120 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 219:993c9b0acbcc 121 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 219:993c9b0acbcc 122 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 219:993c9b0acbcc 123
mbed_official 219:993c9b0acbcc 124 // Save new values
mbed_official 219:993c9b0acbcc 125 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 219:993c9b0acbcc 126 obj->cpol = SPI_POLARITY_LOW;
mbed_official 219:993c9b0acbcc 127 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 219:993c9b0acbcc 128 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 219:993c9b0acbcc 129
mbed_official 219:993c9b0acbcc 130 obj->pin_miso = miso;
mbed_official 219:993c9b0acbcc 131 obj->pin_mosi = mosi;
mbed_official 219:993c9b0acbcc 132 obj->pin_sclk = sclk;
mbed_official 219:993c9b0acbcc 133 obj->pin_ssel = ssel;
mbed_official 219:993c9b0acbcc 134
mbed_official 219:993c9b0acbcc 135 if (ssel == NC) { // SW NSS Master mode
mbed_official 219:993c9b0acbcc 136 obj->mode = SPI_MODE_MASTER;
mbed_official 219:993c9b0acbcc 137 obj->nss = SPI_NSS_SOFT;
mbed_official 219:993c9b0acbcc 138 } else { // Slave
mbed_official 219:993c9b0acbcc 139 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 219:993c9b0acbcc 140 obj->mode = SPI_MODE_SLAVE;
mbed_official 219:993c9b0acbcc 141 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 219:993c9b0acbcc 142 }
mbed_official 219:993c9b0acbcc 143
mbed_official 219:993c9b0acbcc 144 init_spi(obj);
mbed_official 219:993c9b0acbcc 145 }
mbed_official 219:993c9b0acbcc 146
mbed_official 219:993c9b0acbcc 147 void spi_free(spi_t *obj) {
mbed_official 219:993c9b0acbcc 148 // Reset SPI and disable clock
mbed_official 219:993c9b0acbcc 149 if (obj->spi == SPI_1) {
mbed_official 219:993c9b0acbcc 150 __SPI1_FORCE_RESET();
mbed_official 219:993c9b0acbcc 151 __SPI1_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 152 __SPI1_CLK_DISABLE();
mbed_official 219:993c9b0acbcc 153 }
mbed_official 219:993c9b0acbcc 154
mbed_official 219:993c9b0acbcc 155 if (obj->spi == SPI_2) {
mbed_official 219:993c9b0acbcc 156 __SPI2_FORCE_RESET();
mbed_official 219:993c9b0acbcc 157 __SPI2_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 158 __SPI2_CLK_DISABLE();
mbed_official 219:993c9b0acbcc 159 }
mbed_official 219:993c9b0acbcc 160
mbed_official 219:993c9b0acbcc 161 // Configure GPIO
mbed_official 219:993c9b0acbcc 162 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 163 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 164 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 165 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 166 }
mbed_official 219:993c9b0acbcc 167
mbed_official 219:993c9b0acbcc 168 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 219:993c9b0acbcc 169 // Save new values
mbed_official 219:993c9b0acbcc 170 if (bits == 16) {
mbed_official 219:993c9b0acbcc 171 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 219:993c9b0acbcc 172 } else {
mbed_official 219:993c9b0acbcc 173 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 219:993c9b0acbcc 174 }
mbed_official 219:993c9b0acbcc 175
mbed_official 219:993c9b0acbcc 176 switch (mode) {
mbed_official 219:993c9b0acbcc 177 case 0:
mbed_official 219:993c9b0acbcc 178 obj->cpol = SPI_POLARITY_LOW;
mbed_official 219:993c9b0acbcc 179 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 219:993c9b0acbcc 180 break;
mbed_official 219:993c9b0acbcc 181 case 1:
mbed_official 219:993c9b0acbcc 182 obj->cpol = SPI_POLARITY_LOW;
mbed_official 219:993c9b0acbcc 183 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 219:993c9b0acbcc 184 break;
mbed_official 219:993c9b0acbcc 185 case 2:
mbed_official 219:993c9b0acbcc 186 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 219:993c9b0acbcc 187 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 219:993c9b0acbcc 188 break;
mbed_official 219:993c9b0acbcc 189 default:
mbed_official 219:993c9b0acbcc 190 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 219:993c9b0acbcc 191 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 219:993c9b0acbcc 192 break;
mbed_official 219:993c9b0acbcc 193 }
mbed_official 219:993c9b0acbcc 194
mbed_official 219:993c9b0acbcc 195 if (slave == 0) {
mbed_official 219:993c9b0acbcc 196 obj->mode = SPI_MODE_MASTER;
mbed_official 219:993c9b0acbcc 197 obj->nss = SPI_NSS_SOFT;
mbed_official 219:993c9b0acbcc 198 } else {
mbed_official 219:993c9b0acbcc 199 obj->mode = SPI_MODE_SLAVE;
mbed_official 219:993c9b0acbcc 200 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 219:993c9b0acbcc 201 }
mbed_official 219:993c9b0acbcc 202
mbed_official 219:993c9b0acbcc 203 init_spi(obj);
mbed_official 219:993c9b0acbcc 204 }
mbed_official 219:993c9b0acbcc 205
mbed_official 219:993c9b0acbcc 206 void spi_frequency(spi_t *obj, int hz) {
mbed_official 219:993c9b0acbcc 207 // Note: The frequencies are obtained with SPI clock = 48 MHz (APB clock)
mbed_official 219:993c9b0acbcc 208 if (hz < 375000) {
mbed_official 219:993c9b0acbcc 209 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 188 kHz
mbed_official 219:993c9b0acbcc 210 } else if ((hz >= 375000) && (hz < 750000)) {
mbed_official 219:993c9b0acbcc 211 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
mbed_official 219:993c9b0acbcc 212 } else if ((hz >= 750000) && (hz < 1000000)) {
mbed_official 219:993c9b0acbcc 213 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 750 kHz
mbed_official 219:993c9b0acbcc 214 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 219:993c9b0acbcc 215 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz
mbed_official 219:993c9b0acbcc 216 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 219:993c9b0acbcc 217 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
mbed_official 219:993c9b0acbcc 218 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 219:993c9b0acbcc 219 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
mbed_official 219:993c9b0acbcc 220 } else if ((hz >= 12000000) && (hz < 24000000)) {
mbed_official 219:993c9b0acbcc 221 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
mbed_official 219:993c9b0acbcc 222 } else { // >= 24000000
mbed_official 219:993c9b0acbcc 223 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
mbed_official 219:993c9b0acbcc 224 }
mbed_official 219:993c9b0acbcc 225 init_spi(obj);
mbed_official 219:993c9b0acbcc 226 }
mbed_official 219:993c9b0acbcc 227
mbed_official 219:993c9b0acbcc 228 static inline int ssp_readable(spi_t *obj) {
mbed_official 219:993c9b0acbcc 229 int status;
mbed_official 219:993c9b0acbcc 230 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 231 // Check if data is received
mbed_official 219:993c9b0acbcc 232 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 219:993c9b0acbcc 233 return status;
mbed_official 219:993c9b0acbcc 234 }
mbed_official 219:993c9b0acbcc 235
mbed_official 219:993c9b0acbcc 236 static inline int ssp_writeable(spi_t *obj) {
mbed_official 219:993c9b0acbcc 237 int status;
mbed_official 219:993c9b0acbcc 238 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 239 // Check if data is transmitted
mbed_official 219:993c9b0acbcc 240 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 219:993c9b0acbcc 241 return status;
mbed_official 219:993c9b0acbcc 242 }
mbed_official 219:993c9b0acbcc 243
mbed_official 219:993c9b0acbcc 244 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 219:993c9b0acbcc 245 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 246 while (!ssp_writeable(obj));
mbed_official 219:993c9b0acbcc 247
mbed_official 219:993c9b0acbcc 248 if (obj->bits <= SPI_DATASIZE_8BIT) {
mbed_official 219:993c9b0acbcc 249 // force 8-bit access the data register due to SPI data buffer in this device
mbed_official 219:993c9b0acbcc 250 uint8_t *p_spi_dr = 0;
mbed_official 219:993c9b0acbcc 251 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 219:993c9b0acbcc 252 *p_spi_dr = (uint8_t)value;
mbed_official 219:993c9b0acbcc 253 } else {
mbed_official 219:993c9b0acbcc 254 spi->DR = (uint16_t)value;
mbed_official 219:993c9b0acbcc 255 }
mbed_official 219:993c9b0acbcc 256 }
mbed_official 219:993c9b0acbcc 257
mbed_official 219:993c9b0acbcc 258 static inline int ssp_read(spi_t *obj) {
mbed_official 219:993c9b0acbcc 259 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 260 while (!ssp_readable(obj));
mbed_official 219:993c9b0acbcc 261
mbed_official 219:993c9b0acbcc 262 if (obj->bits <= SPI_DATASIZE_8BIT) {
mbed_official 219:993c9b0acbcc 263 // force 8-bit access the data register due to SPI data buffer in this device
mbed_official 219:993c9b0acbcc 264 uint8_t *p_spi_dr = 0;
mbed_official 219:993c9b0acbcc 265 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 219:993c9b0acbcc 266 return (int)(*p_spi_dr);
mbed_official 219:993c9b0acbcc 267 } else {
mbed_official 219:993c9b0acbcc 268 return (int)spi->DR;
mbed_official 219:993c9b0acbcc 269 }
mbed_official 219:993c9b0acbcc 270 }
mbed_official 219:993c9b0acbcc 271
mbed_official 219:993c9b0acbcc 272 static inline int ssp_busy(spi_t *obj) {
mbed_official 219:993c9b0acbcc 273 int status;
mbed_official 219:993c9b0acbcc 274 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 275 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 219:993c9b0acbcc 276 return status;
mbed_official 219:993c9b0acbcc 277 }
mbed_official 219:993c9b0acbcc 278
mbed_official 219:993c9b0acbcc 279 int spi_master_write(spi_t *obj, int value) {
mbed_official 219:993c9b0acbcc 280 ssp_write(obj, value);
mbed_official 219:993c9b0acbcc 281 return ssp_read(obj);
mbed_official 219:993c9b0acbcc 282 }
mbed_official 219:993c9b0acbcc 283
mbed_official 219:993c9b0acbcc 284 int spi_slave_receive(spi_t *obj) {
mbed_official 219:993c9b0acbcc 285 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 219:993c9b0acbcc 286 };
mbed_official 219:993c9b0acbcc 287
mbed_official 219:993c9b0acbcc 288 int spi_slave_read(spi_t *obj) {
mbed_official 219:993c9b0acbcc 289 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 290 while (!ssp_readable(obj));
mbed_official 219:993c9b0acbcc 291 return (int)spi->DR;
mbed_official 219:993c9b0acbcc 292 }
mbed_official 219:993c9b0acbcc 293
mbed_official 219:993c9b0acbcc 294 void spi_slave_write(spi_t *obj, int value) {
mbed_official 219:993c9b0acbcc 295 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 296 while (!ssp_writeable(obj));
mbed_official 219:993c9b0acbcc 297 spi->DR = (uint16_t)value;
mbed_official 219:993c9b0acbcc 298 }
mbed_official 219:993c9b0acbcc 299
mbed_official 219:993c9b0acbcc 300 int spi_busy(spi_t *obj) {
mbed_official 219:993c9b0acbcc 301 return ssp_busy(obj);
mbed_official 219:993c9b0acbcc 302 }
mbed_official 219:993c9b0acbcc 303
mbed_official 219:993c9b0acbcc 304 #endif