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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.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@239:8cadf13dff33, 2014-06-26 (annotated)

Committer:
mbed_official
Date:
Thu Jun 26 09:15:07 2014 +0100
Revision:
239:8cadf13dff33
Parent:
233:1bbc1451db33
Child:
335:6848febe3436
Synchronized with git revision ea64ad4ac220cd7180724d8bb43310da3e692767



Full URL: https://github.com/mbedmicro/mbed/commit/ea64ad4ac220cd7180724d8bb43310da3e692767/



[NUCLEO_F072RB] mbed assert addition

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 239:8cadf13dff33 30 #include "mbed_assert.h"
mbed_official 219:993c9b0acbcc 31 #include "spi_api.h"
mbed_official 219:993c9b0acbcc 32
mbed_official 219:993c9b0acbcc 33 #if DEVICE_SPI
mbed_official 219:993c9b0acbcc 34
mbed_official 219:993c9b0acbcc 35 #include <math.h>
mbed_official 219:993c9b0acbcc 36 #include "cmsis.h"
mbed_official 219:993c9b0acbcc 37 #include "pinmap.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 239:8cadf13dff33 106 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 219:993c9b0acbcc 107
mbed_official 219:993c9b0acbcc 108 // Enable SPI clock
mbed_official 219:993c9b0acbcc 109 if (obj->spi == SPI_1) {
mbed_official 219:993c9b0acbcc 110 __SPI1_CLK_ENABLE();
mbed_official 219:993c9b0acbcc 111 }
mbed_official 219:993c9b0acbcc 112 if (obj->spi == SPI_2) {
mbed_official 219:993c9b0acbcc 113 __SPI2_CLK_ENABLE();
mbed_official 219:993c9b0acbcc 114 }
mbed_official 219:993c9b0acbcc 115
mbed_official 219:993c9b0acbcc 116 // Configure the SPI pins
mbed_official 219:993c9b0acbcc 117 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 219:993c9b0acbcc 118 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 219:993c9b0acbcc 119 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 219:993c9b0acbcc 120
mbed_official 219:993c9b0acbcc 121 // Save new values
mbed_official 219:993c9b0acbcc 122 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 219:993c9b0acbcc 123 obj->cpol = SPI_POLARITY_LOW;
mbed_official 219:993c9b0acbcc 124 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 219:993c9b0acbcc 125 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 219:993c9b0acbcc 126
mbed_official 219:993c9b0acbcc 127 obj->pin_miso = miso;
mbed_official 219:993c9b0acbcc 128 obj->pin_mosi = mosi;
mbed_official 219:993c9b0acbcc 129 obj->pin_sclk = sclk;
mbed_official 219:993c9b0acbcc 130 obj->pin_ssel = ssel;
mbed_official 219:993c9b0acbcc 131
mbed_official 219:993c9b0acbcc 132 if (ssel == NC) { // SW NSS Master mode
mbed_official 219:993c9b0acbcc 133 obj->mode = SPI_MODE_MASTER;
mbed_official 219:993c9b0acbcc 134 obj->nss = SPI_NSS_SOFT;
mbed_official 219:993c9b0acbcc 135 } else { // Slave
mbed_official 219:993c9b0acbcc 136 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 219:993c9b0acbcc 137 obj->mode = SPI_MODE_SLAVE;
mbed_official 219:993c9b0acbcc 138 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 219:993c9b0acbcc 139 }
mbed_official 219:993c9b0acbcc 140
mbed_official 219:993c9b0acbcc 141 init_spi(obj);
mbed_official 219:993c9b0acbcc 142 }
mbed_official 219:993c9b0acbcc 143
mbed_official 219:993c9b0acbcc 144 void spi_free(spi_t *obj) {
mbed_official 219:993c9b0acbcc 145 // Reset SPI and disable clock
mbed_official 219:993c9b0acbcc 146 if (obj->spi == SPI_1) {
mbed_official 219:993c9b0acbcc 147 __SPI1_FORCE_RESET();
mbed_official 219:993c9b0acbcc 148 __SPI1_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 149 __SPI1_CLK_DISABLE();
mbed_official 219:993c9b0acbcc 150 }
mbed_official 219:993c9b0acbcc 151
mbed_official 219:993c9b0acbcc 152 if (obj->spi == SPI_2) {
mbed_official 219:993c9b0acbcc 153 __SPI2_FORCE_RESET();
mbed_official 219:993c9b0acbcc 154 __SPI2_RELEASE_RESET();
mbed_official 219:993c9b0acbcc 155 __SPI2_CLK_DISABLE();
mbed_official 219:993c9b0acbcc 156 }
mbed_official 219:993c9b0acbcc 157
mbed_official 219:993c9b0acbcc 158 // Configure GPIO
mbed_official 219:993c9b0acbcc 159 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 160 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 161 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 162 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 219:993c9b0acbcc 163 }
mbed_official 219:993c9b0acbcc 164
mbed_official 219:993c9b0acbcc 165 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 219:993c9b0acbcc 166 // Save new values
mbed_official 219:993c9b0acbcc 167 if (bits == 16) {
mbed_official 219:993c9b0acbcc 168 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 219:993c9b0acbcc 169 } else {
mbed_official 219:993c9b0acbcc 170 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 219:993c9b0acbcc 171 }
mbed_official 219:993c9b0acbcc 172
mbed_official 219:993c9b0acbcc 173 switch (mode) {
mbed_official 219:993c9b0acbcc 174 case 0:
mbed_official 219:993c9b0acbcc 175 obj->cpol = SPI_POLARITY_LOW;
mbed_official 219:993c9b0acbcc 176 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 219:993c9b0acbcc 177 break;
mbed_official 219:993c9b0acbcc 178 case 1:
mbed_official 219:993c9b0acbcc 179 obj->cpol = SPI_POLARITY_LOW;
mbed_official 219:993c9b0acbcc 180 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 219:993c9b0acbcc 181 break;
mbed_official 219:993c9b0acbcc 182 case 2:
mbed_official 219:993c9b0acbcc 183 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 219:993c9b0acbcc 184 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 219:993c9b0acbcc 185 break;
mbed_official 219:993c9b0acbcc 186 default:
mbed_official 219:993c9b0acbcc 187 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 219:993c9b0acbcc 188 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 219:993c9b0acbcc 189 break;
mbed_official 219:993c9b0acbcc 190 }
mbed_official 219:993c9b0acbcc 191
mbed_official 219:993c9b0acbcc 192 if (slave == 0) {
mbed_official 219:993c9b0acbcc 193 obj->mode = SPI_MODE_MASTER;
mbed_official 219:993c9b0acbcc 194 obj->nss = SPI_NSS_SOFT;
mbed_official 219:993c9b0acbcc 195 } else {
mbed_official 219:993c9b0acbcc 196 obj->mode = SPI_MODE_SLAVE;
mbed_official 219:993c9b0acbcc 197 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 219:993c9b0acbcc 198 }
mbed_official 219:993c9b0acbcc 199
mbed_official 219:993c9b0acbcc 200 init_spi(obj);
mbed_official 219:993c9b0acbcc 201 }
mbed_official 219:993c9b0acbcc 202
mbed_official 219:993c9b0acbcc 203 void spi_frequency(spi_t *obj, int hz) {
mbed_official 219:993c9b0acbcc 204 // Note: The frequencies are obtained with SPI clock = 48 MHz (APB clock)
mbed_official 219:993c9b0acbcc 205 if (hz < 375000) {
mbed_official 219:993c9b0acbcc 206 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 188 kHz
mbed_official 219:993c9b0acbcc 207 } else if ((hz >= 375000) && (hz < 750000)) {
mbed_official 219:993c9b0acbcc 208 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
mbed_official 219:993c9b0acbcc 209 } else if ((hz >= 750000) && (hz < 1000000)) {
mbed_official 219:993c9b0acbcc 210 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 750 kHz
mbed_official 219:993c9b0acbcc 211 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 219:993c9b0acbcc 212 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz
mbed_official 219:993c9b0acbcc 213 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 219:993c9b0acbcc 214 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
mbed_official 219:993c9b0acbcc 215 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 219:993c9b0acbcc 216 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
mbed_official 219:993c9b0acbcc 217 } else if ((hz >= 12000000) && (hz < 24000000)) {
mbed_official 219:993c9b0acbcc 218 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
mbed_official 219:993c9b0acbcc 219 } else { // >= 24000000
mbed_official 219:993c9b0acbcc 220 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
mbed_official 219:993c9b0acbcc 221 }
mbed_official 219:993c9b0acbcc 222 init_spi(obj);
mbed_official 219:993c9b0acbcc 223 }
mbed_official 219:993c9b0acbcc 224
mbed_official 219:993c9b0acbcc 225 static inline int ssp_readable(spi_t *obj) {
mbed_official 219:993c9b0acbcc 226 int status;
mbed_official 219:993c9b0acbcc 227 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 228 // Check if data is received
mbed_official 219:993c9b0acbcc 229 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 219:993c9b0acbcc 230 return status;
mbed_official 219:993c9b0acbcc 231 }
mbed_official 219:993c9b0acbcc 232
mbed_official 219:993c9b0acbcc 233 static inline int ssp_writeable(spi_t *obj) {
mbed_official 219:993c9b0acbcc 234 int status;
mbed_official 219:993c9b0acbcc 235 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 236 // Check if data is transmitted
mbed_official 219:993c9b0acbcc 237 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 219:993c9b0acbcc 238 return status;
mbed_official 219:993c9b0acbcc 239 }
mbed_official 219:993c9b0acbcc 240
mbed_official 219:993c9b0acbcc 241 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 219:993c9b0acbcc 242 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 243 while (!ssp_writeable(obj));
mbed_official 219:993c9b0acbcc 244
mbed_official 219:993c9b0acbcc 245 if (obj->bits <= SPI_DATASIZE_8BIT) {
mbed_official 219:993c9b0acbcc 246 // force 8-bit access the data register due to SPI data buffer in this device
mbed_official 219:993c9b0acbcc 247 uint8_t *p_spi_dr = 0;
mbed_official 219:993c9b0acbcc 248 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 219:993c9b0acbcc 249 *p_spi_dr = (uint8_t)value;
mbed_official 219:993c9b0acbcc 250 } else {
mbed_official 219:993c9b0acbcc 251 spi->DR = (uint16_t)value;
mbed_official 219:993c9b0acbcc 252 }
mbed_official 219:993c9b0acbcc 253 }
mbed_official 219:993c9b0acbcc 254
mbed_official 219:993c9b0acbcc 255 static inline int ssp_read(spi_t *obj) {
mbed_official 219:993c9b0acbcc 256 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 257 while (!ssp_readable(obj));
mbed_official 219:993c9b0acbcc 258
mbed_official 219:993c9b0acbcc 259 if (obj->bits <= SPI_DATASIZE_8BIT) {
mbed_official 219:993c9b0acbcc 260 // force 8-bit access the data register due to SPI data buffer in this device
mbed_official 219:993c9b0acbcc 261 uint8_t *p_spi_dr = 0;
mbed_official 219:993c9b0acbcc 262 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 219:993c9b0acbcc 263 return (int)(*p_spi_dr);
mbed_official 219:993c9b0acbcc 264 } else {
mbed_official 219:993c9b0acbcc 265 return (int)spi->DR;
mbed_official 219:993c9b0acbcc 266 }
mbed_official 219:993c9b0acbcc 267 }
mbed_official 219:993c9b0acbcc 268
mbed_official 219:993c9b0acbcc 269 static inline int ssp_busy(spi_t *obj) {
mbed_official 219:993c9b0acbcc 270 int status;
mbed_official 219:993c9b0acbcc 271 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 272 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 219:993c9b0acbcc 273 return status;
mbed_official 219:993c9b0acbcc 274 }
mbed_official 219:993c9b0acbcc 275
mbed_official 219:993c9b0acbcc 276 int spi_master_write(spi_t *obj, int value) {
mbed_official 219:993c9b0acbcc 277 ssp_write(obj, value);
mbed_official 219:993c9b0acbcc 278 return ssp_read(obj);
mbed_official 219:993c9b0acbcc 279 }
mbed_official 219:993c9b0acbcc 280
mbed_official 219:993c9b0acbcc 281 int spi_slave_receive(spi_t *obj) {
mbed_official 233:1bbc1451db33 282 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 219:993c9b0acbcc 283 };
mbed_official 219:993c9b0acbcc 284
mbed_official 219:993c9b0acbcc 285 int spi_slave_read(spi_t *obj) {
mbed_official 219:993c9b0acbcc 286 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 287 while (!ssp_readable(obj));
mbed_official 219:993c9b0acbcc 288 return (int)spi->DR;
mbed_official 219:993c9b0acbcc 289 }
mbed_official 219:993c9b0acbcc 290
mbed_official 219:993c9b0acbcc 291 void spi_slave_write(spi_t *obj, int value) {
mbed_official 219:993c9b0acbcc 292 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 219:993c9b0acbcc 293 while (!ssp_writeable(obj));
mbed_official 219:993c9b0acbcc 294 spi->DR = (uint16_t)value;
mbed_official 219:993c9b0acbcc 295 }
mbed_official 219:993c9b0acbcc 296
mbed_official 219:993c9b0acbcc 297 int spi_busy(spi_t *obj) {
mbed_official 219:993c9b0acbcc 298 return ssp_busy(obj);
mbed_official 219:993c9b0acbcc 299 }
mbed_official 219:993c9b0acbcc 300
mbed_official 219:993c9b0acbcc 301 #endif