PHung Tung / SRC_STM32F7

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Dependents:   WAV

targets/hal/TARGET_STM/TARGET_STM32F7/spi_api.c@0:e87aa4c49e95, 2019-06-04 (annotated)

Committer:
phungductung
Date:
Tue Jun 04 21:51:46 2019 +0000
Revision:
0:e87aa4c49e95
libray

Who changed what in which revision?

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phungductung 0:e87aa4c49e95 1 /* mbed Microcontroller Library
phungductung 0:e87aa4c49e95 2 *******************************************************************************
phungductung 0:e87aa4c49e95 3 * Copyright (c) 2015, STMicroelectronics
phungductung 0:e87aa4c49e95 4 * All rights reserved.
phungductung 0:e87aa4c49e95 5 *
phungductung 0:e87aa4c49e95 6 * Redistribution and use in source and binary forms, with or without
phungductung 0:e87aa4c49e95 7 * modification, are permitted provided that the following conditions are met:
phungductung 0:e87aa4c49e95 8 *
phungductung 0:e87aa4c49e95 9 * 1. Redistributions of source code must retain the above copyright notice,
phungductung 0:e87aa4c49e95 10 * this list of conditions and the following disclaimer.
phungductung 0:e87aa4c49e95 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
phungductung 0:e87aa4c49e95 12 * this list of conditions and the following disclaimer in the documentation
phungductung 0:e87aa4c49e95 13 * and/or other materials provided with the distribution.
phungductung 0:e87aa4c49e95 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
phungductung 0:e87aa4c49e95 15 * may be used to endorse or promote products derived from this software
phungductung 0:e87aa4c49e95 16 * without specific prior written permission.
phungductung 0:e87aa4c49e95 17 *
phungductung 0:e87aa4c49e95 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
phungductung 0:e87aa4c49e95 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
phungductung 0:e87aa4c49e95 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
phungductung 0:e87aa4c49e95 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
phungductung 0:e87aa4c49e95 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
phungductung 0:e87aa4c49e95 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
phungductung 0:e87aa4c49e95 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
phungductung 0:e87aa4c49e95 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
phungductung 0:e87aa4c49e95 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
phungductung 0:e87aa4c49e95 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
phungductung 0:e87aa4c49e95 28 *******************************************************************************
phungductung 0:e87aa4c49e95 29 */
phungductung 0:e87aa4c49e95 30 #include "mbed_assert.h"
phungductung 0:e87aa4c49e95 31 #include "spi_api.h"
phungductung 0:e87aa4c49e95 32
phungductung 0:e87aa4c49e95 33 #if DEVICE_SPI
phungductung 0:e87aa4c49e95 34
phungductung 0:e87aa4c49e95 35 #include <math.h>
phungductung 0:e87aa4c49e95 36 #include "cmsis.h"
phungductung 0:e87aa4c49e95 37 #include "pinmap.h"
phungductung 0:e87aa4c49e95 38 #include "PeripheralPins.h"
phungductung 0:e87aa4c49e95 39 #include "mbed_error.h"
phungductung 0:e87aa4c49e95 40
phungductung 0:e87aa4c49e95 41 static SPI_HandleTypeDef SpiHandle;
phungductung 0:e87aa4c49e95 42
phungductung 0:e87aa4c49e95 43 static void init_spi(spi_t *obj)
phungductung 0:e87aa4c49e95 44 {
phungductung 0:e87aa4c49e95 45 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
phungductung 0:e87aa4c49e95 46
phungductung 0:e87aa4c49e95 47 __HAL_SPI_DISABLE(&SpiHandle);
phungductung 0:e87aa4c49e95 48
phungductung 0:e87aa4c49e95 49 SpiHandle.Init.Mode = obj->mode;
phungductung 0:e87aa4c49e95 50 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
phungductung 0:e87aa4c49e95 51 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
phungductung 0:e87aa4c49e95 52 SpiHandle.Init.CLKPhase = obj->cpha;
phungductung 0:e87aa4c49e95 53 SpiHandle.Init.CLKPolarity = obj->cpol;
phungductung 0:e87aa4c49e95 54 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
phungductung 0:e87aa4c49e95 55 SpiHandle.Init.CRCPolynomial = 7;
phungductung 0:e87aa4c49e95 56 SpiHandle.Init.DataSize = obj->bits;
phungductung 0:e87aa4c49e95 57 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
phungductung 0:e87aa4c49e95 58 SpiHandle.Init.NSS = obj->nss;
phungductung 0:e87aa4c49e95 59 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
phungductung 0:e87aa4c49e95 60
phungductung 0:e87aa4c49e95 61 if (HAL_SPI_Init(&SpiHandle) != HAL_OK) {
phungductung 0:e87aa4c49e95 62 error("Cannot initialize SPI");
phungductung 0:e87aa4c49e95 63 }
phungductung 0:e87aa4c49e95 64
phungductung 0:e87aa4c49e95 65 __HAL_SPI_ENABLE(&SpiHandle);
phungductung 0:e87aa4c49e95 66 }
phungductung 0:e87aa4c49e95 67
phungductung 0:e87aa4c49e95 68 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
phungductung 0:e87aa4c49e95 69 {
phungductung 0:e87aa4c49e95 70 // Determine the SPI to use
phungductung 0:e87aa4c49e95 71 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
phungductung 0:e87aa4c49e95 72 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
phungductung 0:e87aa4c49e95 73 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
phungductung 0:e87aa4c49e95 74 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
phungductung 0:e87aa4c49e95 75
phungductung 0:e87aa4c49e95 76 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
phungductung 0:e87aa4c49e95 77 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
phungductung 0:e87aa4c49e95 78
phungductung 0:e87aa4c49e95 79 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
phungductung 0:e87aa4c49e95 80 MBED_ASSERT(obj->spi != (SPIName)NC);
phungductung 0:e87aa4c49e95 81
phungductung 0:e87aa4c49e95 82 // Enable SPI clock
phungductung 0:e87aa4c49e95 83 if (obj->spi == SPI_1) {
phungductung 0:e87aa4c49e95 84 __HAL_RCC_SPI1_CLK_ENABLE();
phungductung 0:e87aa4c49e95 85 }
phungductung 0:e87aa4c49e95 86
phungductung 0:e87aa4c49e95 87 if (obj->spi == SPI_2) {
phungductung 0:e87aa4c49e95 88 __HAL_RCC_SPI2_CLK_ENABLE();
phungductung 0:e87aa4c49e95 89 }
phungductung 0:e87aa4c49e95 90
phungductung 0:e87aa4c49e95 91 if (obj->spi == SPI_3) {
phungductung 0:e87aa4c49e95 92 __HAL_RCC_SPI3_CLK_ENABLE();
phungductung 0:e87aa4c49e95 93 }
phungductung 0:e87aa4c49e95 94
phungductung 0:e87aa4c49e95 95 if (obj->spi == SPI_4) {
phungductung 0:e87aa4c49e95 96 __HAL_RCC_SPI4_CLK_ENABLE();
phungductung 0:e87aa4c49e95 97 }
phungductung 0:e87aa4c49e95 98
phungductung 0:e87aa4c49e95 99 if (obj->spi == SPI_5) {
phungductung 0:e87aa4c49e95 100 __HAL_RCC_SPI5_CLK_ENABLE();
phungductung 0:e87aa4c49e95 101 }
phungductung 0:e87aa4c49e95 102
phungductung 0:e87aa4c49e95 103 if (obj->spi == SPI_6) {
phungductung 0:e87aa4c49e95 104 __HAL_RCC_SPI6_CLK_ENABLE();
phungductung 0:e87aa4c49e95 105 }
phungductung 0:e87aa4c49e95 106
phungductung 0:e87aa4c49e95 107 // Configure the SPI pins
phungductung 0:e87aa4c49e95 108 pinmap_pinout(mosi, PinMap_SPI_MOSI);
phungductung 0:e87aa4c49e95 109 pinmap_pinout(miso, PinMap_SPI_MISO);
phungductung 0:e87aa4c49e95 110 pinmap_pinout(sclk, PinMap_SPI_SCLK);
phungductung 0:e87aa4c49e95 111
phungductung 0:e87aa4c49e95 112 // Save new values
phungductung 0:e87aa4c49e95 113 obj->bits = SPI_DATASIZE_8BIT;
phungductung 0:e87aa4c49e95 114 obj->cpol = SPI_POLARITY_LOW;
phungductung 0:e87aa4c49e95 115 obj->cpha = SPI_PHASE_1EDGE;
phungductung 0:e87aa4c49e95 116 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
phungductung 0:e87aa4c49e95 117
phungductung 0:e87aa4c49e95 118 obj->pin_miso = miso;
phungductung 0:e87aa4c49e95 119 obj->pin_mosi = mosi;
phungductung 0:e87aa4c49e95 120 obj->pin_sclk = sclk;
phungductung 0:e87aa4c49e95 121 obj->pin_ssel = ssel;
phungductung 0:e87aa4c49e95 122
phungductung 0:e87aa4c49e95 123 if (ssel != NC) {
phungductung 0:e87aa4c49e95 124 pinmap_pinout(ssel, PinMap_SPI_SSEL);
phungductung 0:e87aa4c49e95 125 } else {
phungductung 0:e87aa4c49e95 126 obj->nss = SPI_NSS_SOFT;
phungductung 0:e87aa4c49e95 127 }
phungductung 0:e87aa4c49e95 128
phungductung 0:e87aa4c49e95 129 init_spi(obj);
phungductung 0:e87aa4c49e95 130 }
phungductung 0:e87aa4c49e95 131
phungductung 0:e87aa4c49e95 132 void spi_free(spi_t *obj)
phungductung 0:e87aa4c49e95 133 {
phungductung 0:e87aa4c49e95 134 // Reset SPI and disable clock
phungductung 0:e87aa4c49e95 135 if (obj->spi == SPI_1) {
phungductung 0:e87aa4c49e95 136 __HAL_RCC_SPI1_FORCE_RESET();
phungductung 0:e87aa4c49e95 137 __HAL_RCC_SPI1_RELEASE_RESET();
phungductung 0:e87aa4c49e95 138 __HAL_RCC_SPI1_CLK_DISABLE();
phungductung 0:e87aa4c49e95 139 }
phungductung 0:e87aa4c49e95 140
phungductung 0:e87aa4c49e95 141 if (obj->spi == SPI_2) {
phungductung 0:e87aa4c49e95 142 __HAL_RCC_SPI2_FORCE_RESET();
phungductung 0:e87aa4c49e95 143 __HAL_RCC_SPI2_RELEASE_RESET();
phungductung 0:e87aa4c49e95 144 __HAL_RCC_SPI2_CLK_DISABLE();
phungductung 0:e87aa4c49e95 145 }
phungductung 0:e87aa4c49e95 146
phungductung 0:e87aa4c49e95 147 if (obj->spi == SPI_3) {
phungductung 0:e87aa4c49e95 148 __HAL_RCC_SPI3_FORCE_RESET();
phungductung 0:e87aa4c49e95 149 __HAL_RCC_SPI3_RELEASE_RESET();
phungductung 0:e87aa4c49e95 150 __HAL_RCC_SPI3_CLK_DISABLE();
phungductung 0:e87aa4c49e95 151 }
phungductung 0:e87aa4c49e95 152
phungductung 0:e87aa4c49e95 153 if (obj->spi == SPI_4) {
phungductung 0:e87aa4c49e95 154 __HAL_RCC_SPI4_FORCE_RESET();
phungductung 0:e87aa4c49e95 155 __HAL_RCC_SPI4_RELEASE_RESET();
phungductung 0:e87aa4c49e95 156 __HAL_RCC_SPI4_CLK_DISABLE();
phungductung 0:e87aa4c49e95 157 }
phungductung 0:e87aa4c49e95 158
phungductung 0:e87aa4c49e95 159 if (obj->spi == SPI_5) {
phungductung 0:e87aa4c49e95 160 __HAL_RCC_SPI5_FORCE_RESET();
phungductung 0:e87aa4c49e95 161 __HAL_RCC_SPI5_RELEASE_RESET();
phungductung 0:e87aa4c49e95 162 __HAL_RCC_SPI5_CLK_DISABLE();
phungductung 0:e87aa4c49e95 163 }
phungductung 0:e87aa4c49e95 164
phungductung 0:e87aa4c49e95 165 if (obj->spi == SPI_6) {
phungductung 0:e87aa4c49e95 166 __HAL_RCC_SPI6_FORCE_RESET();
phungductung 0:e87aa4c49e95 167 __HAL_RCC_SPI6_RELEASE_RESET();
phungductung 0:e87aa4c49e95 168 __HAL_RCC_SPI6_CLK_DISABLE();
phungductung 0:e87aa4c49e95 169 }
phungductung 0:e87aa4c49e95 170
phungductung 0:e87aa4c49e95 171 // Configure GPIOs
phungductung 0:e87aa4c49e95 172 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
phungductung 0:e87aa4c49e95 173 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
phungductung 0:e87aa4c49e95 174 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
phungductung 0:e87aa4c49e95 175 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
phungductung 0:e87aa4c49e95 176 }
phungductung 0:e87aa4c49e95 177
phungductung 0:e87aa4c49e95 178 void spi_format(spi_t *obj, int bits, int mode, int slave)
phungductung 0:e87aa4c49e95 179 {
phungductung 0:e87aa4c49e95 180 // Save new values
phungductung 0:e87aa4c49e95 181 if (bits == 16) {
phungductung 0:e87aa4c49e95 182 obj->bits = SPI_DATASIZE_16BIT;
phungductung 0:e87aa4c49e95 183 } else {
phungductung 0:e87aa4c49e95 184 obj->bits = SPI_DATASIZE_8BIT;
phungductung 0:e87aa4c49e95 185 }
phungductung 0:e87aa4c49e95 186
phungductung 0:e87aa4c49e95 187 switch (mode) {
phungductung 0:e87aa4c49e95 188 case 0:
phungductung 0:e87aa4c49e95 189 obj->cpol = SPI_POLARITY_LOW;
phungductung 0:e87aa4c49e95 190 obj->cpha = SPI_PHASE_1EDGE;
phungductung 0:e87aa4c49e95 191 break;
phungductung 0:e87aa4c49e95 192 case 1:
phungductung 0:e87aa4c49e95 193 obj->cpol = SPI_POLARITY_LOW;
phungductung 0:e87aa4c49e95 194 obj->cpha = SPI_PHASE_2EDGE;
phungductung 0:e87aa4c49e95 195 break;
phungductung 0:e87aa4c49e95 196 case 2:
phungductung 0:e87aa4c49e95 197 obj->cpol = SPI_POLARITY_HIGH;
phungductung 0:e87aa4c49e95 198 obj->cpha = SPI_PHASE_1EDGE;
phungductung 0:e87aa4c49e95 199 break;
phungductung 0:e87aa4c49e95 200 default:
phungductung 0:e87aa4c49e95 201 obj->cpol = SPI_POLARITY_HIGH;
phungductung 0:e87aa4c49e95 202 obj->cpha = SPI_PHASE_2EDGE;
phungductung 0:e87aa4c49e95 203 break;
phungductung 0:e87aa4c49e95 204 }
phungductung 0:e87aa4c49e95 205
phungductung 0:e87aa4c49e95 206 if (obj->nss != SPI_NSS_SOFT) {
phungductung 0:e87aa4c49e95 207 obj->nss = (slave) ? SPI_NSS_HARD_INPUT : SPI_NSS_HARD_OUTPUT;
phungductung 0:e87aa4c49e95 208 }
phungductung 0:e87aa4c49e95 209
phungductung 0:e87aa4c49e95 210 obj->mode = (slave) ? SPI_MODE_SLAVE : SPI_MODE_MASTER;
phungductung 0:e87aa4c49e95 211
phungductung 0:e87aa4c49e95 212 init_spi(obj);
phungductung 0:e87aa4c49e95 213 }
phungductung 0:e87aa4c49e95 214
phungductung 0:e87aa4c49e95 215 void spi_frequency(spi_t *obj, int hz)
phungductung 0:e87aa4c49e95 216 {
phungductung 0:e87aa4c49e95 217 // The frequencies are obtained with:
phungductung 0:e87aa4c49e95 218 // - SPI2/SPI3 clock = 54 MHz (APB1 clock)
phungductung 0:e87aa4c49e95 219 // - SPI1/SPI4/SPI5/SPI6 clocks = 108 MHz (APB2 clock)
phungductung 0:e87aa4c49e95 220 switch(obj->spi) {
phungductung 0:e87aa4c49e95 221 case SPI_1:
phungductung 0:e87aa4c49e95 222 case SPI_4:
phungductung 0:e87aa4c49e95 223 case SPI_5:
phungductung 0:e87aa4c49e95 224 case SPI_6:
phungductung 0:e87aa4c49e95 225 if (hz < 800000) {
phungductung 0:e87aa4c49e95 226 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 422 kHz
phungductung 0:e87aa4c49e95 227 } else if ((hz >= 800000) && (hz < 1000000)) {
phungductung 0:e87aa4c49e95 228 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 844 kHz
phungductung 0:e87aa4c49e95 229 } else if ((hz >= 1000000) && (hz < 3000000)) {
phungductung 0:e87aa4c49e95 230 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.69 MHz
phungductung 0:e87aa4c49e95 231 } else if ((hz >= 3000000) && (hz < 6000000)) {
phungductung 0:e87aa4c49e95 232 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 3.38 MHz
phungductung 0:e87aa4c49e95 233 } else if ((hz >= 6000000) && (hz < 12000000)) {
phungductung 0:e87aa4c49e95 234 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 6.75 MHz
phungductung 0:e87aa4c49e95 235 } else if ((hz >= 12000000) && (hz < 24000000)) {
phungductung 0:e87aa4c49e95 236 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 13.5 MHz
phungductung 0:e87aa4c49e95 237 } else if ((hz >= 24000000) && (hz < 54000000)) {
phungductung 0:e87aa4c49e95 238 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 27 MHz
phungductung 0:e87aa4c49e95 239 } else { // >= 54000000
phungductung 0:e87aa4c49e95 240 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 54 MHz
phungductung 0:e87aa4c49e95 241 }
phungductung 0:e87aa4c49e95 242 break;
phungductung 0:e87aa4c49e95 243 case SPI_2:
phungductung 0:e87aa4c49e95 244 case SPI_3:
phungductung 0:e87aa4c49e95 245 if (hz < 400000) {
phungductung 0:e87aa4c49e95 246 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 211 kHz
phungductung 0:e87aa4c49e95 247 } else if ((hz >= 400000) && (hz < 800000)) {
phungductung 0:e87aa4c49e95 248 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 422 kHz
phungductung 0:e87aa4c49e95 249 } else if ((hz >= 800000) && (hz < 1000000)) {
phungductung 0:e87aa4c49e95 250 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 844 kHz
phungductung 0:e87aa4c49e95 251 } else if ((hz >= 1000000) && (hz < 3000000)) {
phungductung 0:e87aa4c49e95 252 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.69 MHz
phungductung 0:e87aa4c49e95 253 } else if ((hz >= 3000000) && (hz < 6000000)) {
phungductung 0:e87aa4c49e95 254 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3.38 MHz
phungductung 0:e87aa4c49e95 255 } else if ((hz >= 6000000) && (hz < 12000000)) {
phungductung 0:e87aa4c49e95 256 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6.75 MHz
phungductung 0:e87aa4c49e95 257 } else if ((hz >= 12000000) && (hz < 24000000)) {
phungductung 0:e87aa4c49e95 258 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 13.5 MHz
phungductung 0:e87aa4c49e95 259 } else { // >= 24000000
phungductung 0:e87aa4c49e95 260 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 27 MHz
phungductung 0:e87aa4c49e95 261 }
phungductung 0:e87aa4c49e95 262 break;
phungductung 0:e87aa4c49e95 263 default:
phungductung 0:e87aa4c49e95 264 return;
phungductung 0:e87aa4c49e95 265 }
phungductung 0:e87aa4c49e95 266
phungductung 0:e87aa4c49e95 267 init_spi(obj);
phungductung 0:e87aa4c49e95 268 }
phungductung 0:e87aa4c49e95 269
phungductung 0:e87aa4c49e95 270 static inline int ssp_readable(spi_t *obj)
phungductung 0:e87aa4c49e95 271 {
phungductung 0:e87aa4c49e95 272 int status;
phungductung 0:e87aa4c49e95 273 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
phungductung 0:e87aa4c49e95 274 // Check if data is received
phungductung 0:e87aa4c49e95 275 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
phungductung 0:e87aa4c49e95 276 return status;
phungductung 0:e87aa4c49e95 277 }
phungductung 0:e87aa4c49e95 278
phungductung 0:e87aa4c49e95 279 static inline int ssp_writeable(spi_t *obj)
phungductung 0:e87aa4c49e95 280 {
phungductung 0:e87aa4c49e95 281 int status;
phungductung 0:e87aa4c49e95 282 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
phungductung 0:e87aa4c49e95 283 // Check if data is transmitted
phungductung 0:e87aa4c49e95 284 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
phungductung 0:e87aa4c49e95 285 return status;
phungductung 0:e87aa4c49e95 286 }
phungductung 0:e87aa4c49e95 287
phungductung 0:e87aa4c49e95 288 static inline void ssp_write(spi_t *obj, int value)
phungductung 0:e87aa4c49e95 289 {
phungductung 0:e87aa4c49e95 290 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
phungductung 0:e87aa4c49e95 291 while (!ssp_writeable(obj));
phungductung 0:e87aa4c49e95 292 if (obj->bits == SPI_DATASIZE_8BIT) {
phungductung 0:e87aa4c49e95 293 // Force 8-bit access to the data register
phungductung 0:e87aa4c49e95 294 uint8_t *p_spi_dr = 0;
phungductung 0:e87aa4c49e95 295 p_spi_dr = (uint8_t *) & (spi->DR);
phungductung 0:e87aa4c49e95 296 *p_spi_dr = (uint8_t)value;
phungductung 0:e87aa4c49e95 297 } else { // SPI_DATASIZE_16BIT
phungductung 0:e87aa4c49e95 298 spi->DR = (uint16_t)value;
phungductung 0:e87aa4c49e95 299 }
phungductung 0:e87aa4c49e95 300 }
phungductung 0:e87aa4c49e95 301
phungductung 0:e87aa4c49e95 302 static inline int ssp_read(spi_t *obj)
phungductung 0:e87aa4c49e95 303 {
phungductung 0:e87aa4c49e95 304 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
phungductung 0:e87aa4c49e95 305 while (!ssp_readable(obj));
phungductung 0:e87aa4c49e95 306 if (obj->bits == SPI_DATASIZE_8BIT) {
phungductung 0:e87aa4c49e95 307 // Force 8-bit access to the data register
phungductung 0:e87aa4c49e95 308 uint8_t *p_spi_dr = 0;
phungductung 0:e87aa4c49e95 309 p_spi_dr = (uint8_t *) & (spi->DR);
phungductung 0:e87aa4c49e95 310 return (int)(*p_spi_dr);
phungductung 0:e87aa4c49e95 311 } else {
phungductung 0:e87aa4c49e95 312 return (int)spi->DR;
phungductung 0:e87aa4c49e95 313 }
phungductung 0:e87aa4c49e95 314 }
phungductung 0:e87aa4c49e95 315
phungductung 0:e87aa4c49e95 316 static inline int ssp_busy(spi_t *obj)
phungductung 0:e87aa4c49e95 317 {
phungductung 0:e87aa4c49e95 318 int status;
phungductung 0:e87aa4c49e95 319 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
phungductung 0:e87aa4c49e95 320 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
phungductung 0:e87aa4c49e95 321 return status;
phungductung 0:e87aa4c49e95 322 }
phungductung 0:e87aa4c49e95 323
phungductung 0:e87aa4c49e95 324 int spi_master_write(spi_t *obj, int value)
phungductung 0:e87aa4c49e95 325 {
phungductung 0:e87aa4c49e95 326 ssp_write(obj, value);
phungductung 0:e87aa4c49e95 327 return ssp_read(obj);
phungductung 0:e87aa4c49e95 328 }
phungductung 0:e87aa4c49e95 329
phungductung 0:e87aa4c49e95 330 int spi_slave_receive(spi_t *obj)
phungductung 0:e87aa4c49e95 331 {
phungductung 0:e87aa4c49e95 332 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
phungductung 0:e87aa4c49e95 333 };
phungductung 0:e87aa4c49e95 334
phungductung 0:e87aa4c49e95 335 int spi_slave_read(spi_t *obj)
phungductung 0:e87aa4c49e95 336 {
phungductung 0:e87aa4c49e95 337 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
phungductung 0:e87aa4c49e95 338 while (!ssp_readable(obj));
phungductung 0:e87aa4c49e95 339 if (obj->bits == SPI_DATASIZE_8BIT) {
phungductung 0:e87aa4c49e95 340 // Force 8-bit access to the data register
phungductung 0:e87aa4c49e95 341 uint8_t *p_spi_dr = 0;
phungductung 0:e87aa4c49e95 342 p_spi_dr = (uint8_t *) & (spi->DR);
phungductung 0:e87aa4c49e95 343 return (int)(*p_spi_dr);
phungductung 0:e87aa4c49e95 344 } else {
phungductung 0:e87aa4c49e95 345 return (int)spi->DR;
phungductung 0:e87aa4c49e95 346 }
phungductung 0:e87aa4c49e95 347 }
phungductung 0:e87aa4c49e95 348
phungductung 0:e87aa4c49e95 349 void spi_slave_write(spi_t *obj, int value)
phungductung 0:e87aa4c49e95 350 {
phungductung 0:e87aa4c49e95 351 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
phungductung 0:e87aa4c49e95 352 while (!ssp_writeable(obj));
phungductung 0:e87aa4c49e95 353 if (obj->bits == SPI_DATASIZE_8BIT) {
phungductung 0:e87aa4c49e95 354 // Force 8-bit access to the data register
phungductung 0:e87aa4c49e95 355 uint8_t *p_spi_dr = 0;
phungductung 0:e87aa4c49e95 356 p_spi_dr = (uint8_t *) & (spi->DR);
phungductung 0:e87aa4c49e95 357 *p_spi_dr = (uint8_t)value;
phungductung 0:e87aa4c49e95 358 } else { // SPI_DATASIZE_16BIT
phungductung 0:e87aa4c49e95 359 spi->DR = (uint16_t)value;
phungductung 0:e87aa4c49e95 360 }
phungductung 0:e87aa4c49e95 361 }
phungductung 0:e87aa4c49e95 362
phungductung 0:e87aa4c49e95 363 int spi_busy(spi_t *obj)
phungductung 0:e87aa4c49e95 364 {
phungductung 0:e87aa4c49e95 365 return ssp_busy(obj);
phungductung 0:e87aa4c49e95 366 }
phungductung 0:e87aa4c49e95 367
phungductung 0:e87aa4c49e95 368 #endif