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This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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_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
Child:
233:1bbc1451db33
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