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targets/hal/TARGET_STM/TARGET_STM32F3/spi_api.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
144:ef7eb2e8f9f7
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /* mbed Microcontroller Library
bogdanm 0:9b334a45a8ff 2 *******************************************************************************
bogdanm 0:9b334a45a8ff 3 * Copyright (c) 2014, STMicroelectronics
bogdanm 0:9b334a45a8ff 4 * All rights reserved.
bogdanm 0:9b334a45a8ff 5 *
bogdanm 0:9b334a45a8ff 6 * Redistribution and use in source and binary forms, with or without
bogdanm 0:9b334a45a8ff 7 * modification, are permitted provided that the following conditions are met:
bogdanm 0:9b334a45a8ff 8 *
bogdanm 0:9b334a45a8ff 9 * 1. Redistributions of source code must retain the above copyright notice,
bogdanm 0:9b334a45a8ff 10 * this list of conditions and the following disclaimer.
bogdanm 0:9b334a45a8ff 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
bogdanm 0:9b334a45a8ff 12 * this list of conditions and the following disclaimer in the documentation
bogdanm 0:9b334a45a8ff 13 * and/or other materials provided with the distribution.
bogdanm 0:9b334a45a8ff 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
bogdanm 0:9b334a45a8ff 15 * may be used to endorse or promote products derived from this software
bogdanm 0:9b334a45a8ff 16 * without specific prior written permission.
bogdanm 0:9b334a45a8ff 17 *
bogdanm 0:9b334a45a8ff 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
bogdanm 0:9b334a45a8ff 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
bogdanm 0:9b334a45a8ff 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
bogdanm 0:9b334a45a8ff 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
bogdanm 0:9b334a45a8ff 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
bogdanm 0:9b334a45a8ff 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
bogdanm 0:9b334a45a8ff 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
bogdanm 0:9b334a45a8ff 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
bogdanm 0:9b334a45a8ff 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
bogdanm 0:9b334a45a8ff 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
bogdanm 0:9b334a45a8ff 28 *******************************************************************************
bogdanm 0:9b334a45a8ff 29 */
bogdanm 0:9b334a45a8ff 30 #include "mbed_assert.h"
bogdanm 0:9b334a45a8ff 31 #include "spi_api.h"
bogdanm 0:9b334a45a8ff 32
bogdanm 0:9b334a45a8ff 33 #if DEVICE_SPI
bogdanm 0:9b334a45a8ff 34
bogdanm 0:9b334a45a8ff 35 #include <math.h>
bogdanm 0:9b334a45a8ff 36 #include "cmsis.h"
bogdanm 0:9b334a45a8ff 37 #include "pinmap.h"
bogdanm 0:9b334a45a8ff 38 #include "PeripheralPins.h"
bogdanm 0:9b334a45a8ff 39
bogdanm 0:9b334a45a8ff 40 static SPI_HandleTypeDef SpiHandle;
bogdanm 0:9b334a45a8ff 41
bogdanm 0:9b334a45a8ff 42 static void init_spi(spi_t *obj)
bogdanm 0:9b334a45a8ff 43 {
bogdanm 0:9b334a45a8ff 44 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 45
bogdanm 0:9b334a45a8ff 46 __HAL_SPI_DISABLE(&SpiHandle);
bogdanm 0:9b334a45a8ff 47
bogdanm 0:9b334a45a8ff 48 SpiHandle.Init.Mode = obj->mode;
bogdanm 0:9b334a45a8ff 49 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
bogdanm 0:9b334a45a8ff 50 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
bogdanm 0:9b334a45a8ff 51 SpiHandle.Init.CLKPhase = obj->cpha;
bogdanm 0:9b334a45a8ff 52 SpiHandle.Init.CLKPolarity = obj->cpol;
bogdanm 0:9b334a45a8ff 53 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
bogdanm 0:9b334a45a8ff 54 SpiHandle.Init.CRCPolynomial = 7;
bogdanm 0:9b334a45a8ff 55 SpiHandle.Init.DataSize = obj->bits;
bogdanm 0:9b334a45a8ff 56 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
bogdanm 0:9b334a45a8ff 57 SpiHandle.Init.NSS = obj->nss;
bogdanm 0:9b334a45a8ff 58 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
bogdanm 0:9b334a45a8ff 59
bogdanm 0:9b334a45a8ff 60 HAL_SPI_Init(&SpiHandle);
bogdanm 0:9b334a45a8ff 61
bogdanm 0:9b334a45a8ff 62 __HAL_SPI_ENABLE(&SpiHandle);
bogdanm 0:9b334a45a8ff 63 }
bogdanm 0:9b334a45a8ff 64
bogdanm 0:9b334a45a8ff 65 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
bogdanm 0:9b334a45a8ff 66 {
bogdanm 0:9b334a45a8ff 67 // Determine the SPI to use
bogdanm 0:9b334a45a8ff 68 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
bogdanm 0:9b334a45a8ff 69 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
bogdanm 0:9b334a45a8ff 70 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
bogdanm 0:9b334a45a8ff 71 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
bogdanm 0:9b334a45a8ff 72
bogdanm 0:9b334a45a8ff 73 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
bogdanm 0:9b334a45a8ff 74 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
bogdanm 0:9b334a45a8ff 75
bogdanm 0:9b334a45a8ff 76 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
bogdanm 0:9b334a45a8ff 77 MBED_ASSERT(obj->spi != (SPIName)NC);
bogdanm 0:9b334a45a8ff 78
bogdanm 0:9b334a45a8ff 79 // Enable SPI clock
bogdanm 0:9b334a45a8ff 80 #if defined(SPI1_BASE)
bogdanm 0:9b334a45a8ff 81 if (obj->spi == SPI_1) {
bogdanm 0:9b334a45a8ff 82 __SPI1_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 83 }
bogdanm 0:9b334a45a8ff 84 #endif
bogdanm 0:9b334a45a8ff 85
bogdanm 0:9b334a45a8ff 86 #if defined(SPI2_BASE)
bogdanm 0:9b334a45a8ff 87 if (obj->spi == SPI_2) {
bogdanm 0:9b334a45a8ff 88 __SPI2_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 89 }
bogdanm 0:9b334a45a8ff 90 #endif
bogdanm 0:9b334a45a8ff 91
bogdanm 0:9b334a45a8ff 92 #if defined(SPI3_BASE)
bogdanm 0:9b334a45a8ff 93 if (obj->spi == SPI_3) {
bogdanm 0:9b334a45a8ff 94 __SPI3_CLK_ENABLE();
bogdanm 0:9b334a45a8ff 95 }
bogdanm 0:9b334a45a8ff 96 #endif
bogdanm 0:9b334a45a8ff 97
bogdanm 0:9b334a45a8ff 98 // Configure the SPI pins
bogdanm 0:9b334a45a8ff 99 pinmap_pinout(mosi, PinMap_SPI_MOSI);
bogdanm 0:9b334a45a8ff 100 pinmap_pinout(miso, PinMap_SPI_MISO);
bogdanm 0:9b334a45a8ff 101 pinmap_pinout(sclk, PinMap_SPI_SCLK);
bogdanm 0:9b334a45a8ff 102
bogdanm 0:9b334a45a8ff 103 // Save new values
bogdanm 0:9b334a45a8ff 104 obj->bits = SPI_DATASIZE_8BIT;
bogdanm 0:9b334a45a8ff 105 obj->cpol = SPI_POLARITY_LOW;
bogdanm 0:9b334a45a8ff 106 obj->cpha = SPI_PHASE_1EDGE;
bogdanm 0:9b334a45a8ff 107 #if defined(TARGET_STM32F334C8)
bogdanm 0:9b334a45a8ff 108 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
bogdanm 0:9b334a45a8ff 109 #else
bogdanm 0:9b334a45a8ff 110 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz (HSI) or 1.13 MHz (HSE)
bogdanm 0:9b334a45a8ff 111 #endif
bogdanm 0:9b334a45a8ff 112
bogdanm 0:9b334a45a8ff 113 obj->pin_miso = miso;
bogdanm 0:9b334a45a8ff 114 obj->pin_mosi = mosi;
bogdanm 0:9b334a45a8ff 115 obj->pin_sclk = sclk;
bogdanm 0:9b334a45a8ff 116 obj->pin_ssel = ssel;
bogdanm 0:9b334a45a8ff 117
bogdanm 0:9b334a45a8ff 118 if (ssel != NC) {
bogdanm 0:9b334a45a8ff 119 pinmap_pinout(ssel, PinMap_SPI_SSEL);
bogdanm 0:9b334a45a8ff 120 } else {
bogdanm 0:9b334a45a8ff 121 obj->nss = SPI_NSS_SOFT;
bogdanm 0:9b334a45a8ff 122 }
bogdanm 0:9b334a45a8ff 123
bogdanm 0:9b334a45a8ff 124 init_spi(obj);
bogdanm 0:9b334a45a8ff 125 }
bogdanm 0:9b334a45a8ff 126
bogdanm 0:9b334a45a8ff 127 void spi_free(spi_t *obj)
bogdanm 0:9b334a45a8ff 128 {
bogdanm 0:9b334a45a8ff 129 // Reset SPI and disable clock
bogdanm 0:9b334a45a8ff 130 #if defined(SPI1_BASE)
bogdanm 0:9b334a45a8ff 131 if (obj->spi == SPI_1) {
bogdanm 0:9b334a45a8ff 132 __SPI1_FORCE_RESET();
bogdanm 0:9b334a45a8ff 133 __SPI1_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 134 __SPI1_CLK_DISABLE();
bogdanm 0:9b334a45a8ff 135 }
bogdanm 0:9b334a45a8ff 136 #endif
bogdanm 0:9b334a45a8ff 137
bogdanm 0:9b334a45a8ff 138 #if defined(SPI2_BASE)
bogdanm 0:9b334a45a8ff 139 if (obj->spi == SPI_2) {
bogdanm 0:9b334a45a8ff 140 __SPI2_FORCE_RESET();
bogdanm 0:9b334a45a8ff 141 __SPI2_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 142 __SPI2_CLK_DISABLE();
bogdanm 0:9b334a45a8ff 143 }
bogdanm 0:9b334a45a8ff 144 #endif
bogdanm 0:9b334a45a8ff 145
bogdanm 0:9b334a45a8ff 146 #if defined(SPI3_BASE)
bogdanm 0:9b334a45a8ff 147 if (obj->spi == SPI_3) {
bogdanm 0:9b334a45a8ff 148 __SPI3_FORCE_RESET();
bogdanm 0:9b334a45a8ff 149 __SPI3_RELEASE_RESET();
bogdanm 0:9b334a45a8ff 150 __SPI3_CLK_DISABLE();
bogdanm 0:9b334a45a8ff 151 }
bogdanm 0:9b334a45a8ff 152 #endif
bogdanm 0:9b334a45a8ff 153
bogdanm 0:9b334a45a8ff 154 // Configure GPIOs
bogdanm 0:9b334a45a8ff 155 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
bogdanm 0:9b334a45a8ff 156 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
bogdanm 0:9b334a45a8ff 157 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
bogdanm 0:9b334a45a8ff 158 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
bogdanm 0:9b334a45a8ff 159 }
bogdanm 0:9b334a45a8ff 160
bogdanm 0:9b334a45a8ff 161 void spi_format(spi_t *obj, int bits, int mode, int slave)
bogdanm 0:9b334a45a8ff 162 {
bogdanm 0:9b334a45a8ff 163 // Save new values
bogdanm 0:9b334a45a8ff 164 if (bits == 16) {
bogdanm 0:9b334a45a8ff 165 obj->bits = SPI_DATASIZE_16BIT;
bogdanm 0:9b334a45a8ff 166 } else {
bogdanm 0:9b334a45a8ff 167 obj->bits = SPI_DATASIZE_8BIT;
bogdanm 0:9b334a45a8ff 168 }
bogdanm 0:9b334a45a8ff 169
bogdanm 0:9b334a45a8ff 170 switch (mode) {
bogdanm 0:9b334a45a8ff 171 case 0:
bogdanm 0:9b334a45a8ff 172 obj->cpol = SPI_POLARITY_LOW;
bogdanm 0:9b334a45a8ff 173 obj->cpha = SPI_PHASE_1EDGE;
bogdanm 0:9b334a45a8ff 174 break;
bogdanm 0:9b334a45a8ff 175 case 1:
bogdanm 0:9b334a45a8ff 176 obj->cpol = SPI_POLARITY_LOW;
bogdanm 0:9b334a45a8ff 177 obj->cpha = SPI_PHASE_2EDGE;
bogdanm 0:9b334a45a8ff 178 break;
bogdanm 0:9b334a45a8ff 179 case 2:
bogdanm 0:9b334a45a8ff 180 obj->cpol = SPI_POLARITY_HIGH;
bogdanm 0:9b334a45a8ff 181 obj->cpha = SPI_PHASE_1EDGE;
bogdanm 0:9b334a45a8ff 182 break;
bogdanm 0:9b334a45a8ff 183 default:
bogdanm 0:9b334a45a8ff 184 obj->cpol = SPI_POLARITY_HIGH;
bogdanm 0:9b334a45a8ff 185 obj->cpha = SPI_PHASE_2EDGE;
bogdanm 0:9b334a45a8ff 186 break;
bogdanm 0:9b334a45a8ff 187 }
bogdanm 0:9b334a45a8ff 188
bogdanm 0:9b334a45a8ff 189 if (obj->nss != SPI_NSS_SOFT) {
bogdanm 0:9b334a45a8ff 190 obj->nss = (slave) ? SPI_NSS_HARD_INPUT : SPI_NSS_HARD_OUTPUT;
bogdanm 0:9b334a45a8ff 191 }
bogdanm 0:9b334a45a8ff 192
bogdanm 0:9b334a45a8ff 193 obj->mode = (slave) ? SPI_MODE_SLAVE : SPI_MODE_MASTER;
bogdanm 0:9b334a45a8ff 194
bogdanm 0:9b334a45a8ff 195 init_spi(obj);
bogdanm 0:9b334a45a8ff 196 }
bogdanm 0:9b334a45a8ff 197
bogdanm 0:9b334a45a8ff 198 void spi_frequency(spi_t *obj, int hz)
bogdanm 0:9b334a45a8ff 199 {
bogdanm 0:9b334a45a8ff 200 #if defined(TARGET_STM32F334C8)
bogdanm 0:9b334a45a8ff 201 // Values depend of APB2CLK : 64 MHz if HSI is used, 72 MHz if HSE is used
bogdanm 0:9b334a45a8ff 202 if (hz < 500000) {
bogdanm 0:9b334a45a8ff 203 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 250 kHz - 281 kHz
bogdanm 0:9b334a45a8ff 204 } else if ((hz >= 500000) && (hz < 1000000)) {
bogdanm 0:9b334a45a8ff 205 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 500 kHz - 563 kHz
bogdanm 0:9b334a45a8ff 206 } else if ((hz >= 1000000) && (hz < 2000000)) {
bogdanm 0:9b334a45a8ff 207 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1 MHz - 1.13 MHz
bogdanm 0:9b334a45a8ff 208 } else if ((hz >= 2000000) && (hz < 4000000)) {
bogdanm 0:9b334a45a8ff 209 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2 MHz - 2.25 MHz
bogdanm 0:9b334a45a8ff 210 } else if ((hz >= 4000000) && (hz < 8000000)) {
bogdanm 0:9b334a45a8ff 211 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 4 MHz - 4.5 MHz
bogdanm 0:9b334a45a8ff 212 } else if ((hz >= 8000000) && (hz < 16000000)) {
bogdanm 0:9b334a45a8ff 213 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 8 MHz - 9 MHz
bogdanm 0:9b334a45a8ff 214 } else if ((hz >= 16000000) && (hz < 32000000)) {
bogdanm 0:9b334a45a8ff 215 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 16 MHz - 18 MHz
bogdanm 0:9b334a45a8ff 216 } else { // >= 32000000
bogdanm 0:9b334a45a8ff 217 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 32 MHz - 36 MHz
bogdanm 0:9b334a45a8ff 218 }
bogdanm 0:9b334a45a8ff 219 #elif defined(TARGET_STM32F302R8)
bogdanm 0:9b334a45a8ff 220 if (hz < 250000) {
bogdanm 0:9b334a45a8ff 221 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 125 kHz - 141 kHz
bogdanm 0:9b334a45a8ff 222 } else if ((hz >= 250000) && (hz < 500000)) {
bogdanm 0:9b334a45a8ff 223 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 250 kHz - 280 kHz
bogdanm 0:9b334a45a8ff 224 } else if ((hz >= 500000) && (hz < 1000000)) {
bogdanm 0:9b334a45a8ff 225 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 500 kHz - 560 kHz
bogdanm 0:9b334a45a8ff 226 } else if ((hz >= 1000000) && (hz < 2000000)) {
bogdanm 0:9b334a45a8ff 227 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz - 1.13 MHz
bogdanm 0:9b334a45a8ff 228 } else if ((hz >= 2000000) && (hz < 4000000)) {
bogdanm 0:9b334a45a8ff 229 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2 MHz - 2.25 MHz
bogdanm 0:9b334a45a8ff 230 } else if ((hz >= 4000000) && (hz < 8000000)) {
bogdanm 0:9b334a45a8ff 231 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 4 MHz - 4.5 MHz
bogdanm 0:9b334a45a8ff 232 } else if ((hz >= 8000000) && (hz < 16000000)) {
bogdanm 0:9b334a45a8ff 233 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 8 MHz - 9 MHz
bogdanm 0:9b334a45a8ff 234 } else { // >= 16000000
bogdanm 0:9b334a45a8ff 235 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 16 MHz - 18 MHz
bogdanm 0:9b334a45a8ff 236 }
bogdanm 0:9b334a45a8ff 237
bogdanm 0:9b334a45a8ff 238 #else
bogdanm 0:9b334a45a8ff 239 // Values depend of APB1CLK and APB2CLK : 32 MHz if HSI is used, 36 MHz if HSE is used
bogdanm 0:9b334a45a8ff 240 if (obj->spi == SPI_1) {
bogdanm 0:9b334a45a8ff 241 if (hz < 500000) {
bogdanm 0:9b334a45a8ff 242 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 250 kHz - 280 kHz
bogdanm 0:9b334a45a8ff 243 } else if ((hz >= 500000) && (hz < 1000000)) {
bogdanm 0:9b334a45a8ff 244 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 500 kHz - 560 kHz
bogdanm 0:9b334a45a8ff 245 } else if ((hz >= 1000000) && (hz < 2000000)) {
bogdanm 0:9b334a45a8ff 246 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1 MHz - 1.13 MHz
bogdanm 0:9b334a45a8ff 247 } else if ((hz >= 2000000) && (hz < 4000000)) {
bogdanm 0:9b334a45a8ff 248 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2 MHz - 2.25 MHz
bogdanm 0:9b334a45a8ff 249 } else if ((hz >= 4000000) && (hz < 8000000)) {
bogdanm 0:9b334a45a8ff 250 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 4 MHz - 4.5 MHz
bogdanm 0:9b334a45a8ff 251 } else if ((hz >= 8000000) && (hz < 16000000)) {
bogdanm 0:9b334a45a8ff 252 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 8 MHz - 9 MHz
bogdanm 0:9b334a45a8ff 253 } else if ((hz >= 16000000) && (hz < 32000000)) {
bogdanm 0:9b334a45a8ff 254 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 16 MHz - 18 MHz
bogdanm 0:9b334a45a8ff 255 } else { // >= 32000000
bogdanm 0:9b334a45a8ff 256 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 32 MHz - 36 MHz
bogdanm 0:9b334a45a8ff 257 }
bogdanm 0:9b334a45a8ff 258 } else {
bogdanm 0:9b334a45a8ff 259 if (hz < 250000) {
bogdanm 0:9b334a45a8ff 260 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 125 kHz - 141 kHz
bogdanm 0:9b334a45a8ff 261 } else if ((hz >= 250000) && (hz < 500000)) {
bogdanm 0:9b334a45a8ff 262 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 250 kHz - 280 kHz
bogdanm 0:9b334a45a8ff 263 } else if ((hz >= 500000) && (hz < 1000000)) {
bogdanm 0:9b334a45a8ff 264 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 500 kHz - 560 kHz
bogdanm 0:9b334a45a8ff 265 } else if ((hz >= 1000000) && (hz < 2000000)) {
bogdanm 0:9b334a45a8ff 266 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz - 1.13 MHz
bogdanm 0:9b334a45a8ff 267 } else if ((hz >= 2000000) && (hz < 4000000)) {
bogdanm 0:9b334a45a8ff 268 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2 MHz - 2.25 MHz
bogdanm 0:9b334a45a8ff 269 } else if ((hz >= 4000000) && (hz < 8000000)) {
bogdanm 0:9b334a45a8ff 270 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 4 MHz - 4.5 MHz
bogdanm 0:9b334a45a8ff 271 } else if ((hz >= 8000000) && (hz < 16000000)) {
bogdanm 0:9b334a45a8ff 272 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 8 MHz - 9 MHz
bogdanm 0:9b334a45a8ff 273 } else { // >= 16000000
bogdanm 0:9b334a45a8ff 274 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 16 MHz - 18 MHz
bogdanm 0:9b334a45a8ff 275 }
bogdanm 0:9b334a45a8ff 276 }
bogdanm 0:9b334a45a8ff 277 #endif
bogdanm 0:9b334a45a8ff 278
bogdanm 0:9b334a45a8ff 279 init_spi(obj);
bogdanm 0:9b334a45a8ff 280 }
bogdanm 0:9b334a45a8ff 281
bogdanm 0:9b334a45a8ff 282 static inline int ssp_readable(spi_t *obj)
bogdanm 0:9b334a45a8ff 283 {
bogdanm 0:9b334a45a8ff 284 int status;
bogdanm 0:9b334a45a8ff 285 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 286 // Check if data is received
bogdanm 0:9b334a45a8ff 287 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
bogdanm 0:9b334a45a8ff 288 return status;
bogdanm 0:9b334a45a8ff 289 }
bogdanm 0:9b334a45a8ff 290
bogdanm 0:9b334a45a8ff 291 static inline int ssp_writeable(spi_t *obj)
bogdanm 0:9b334a45a8ff 292 {
bogdanm 0:9b334a45a8ff 293 int status;
bogdanm 0:9b334a45a8ff 294 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 295 // Check if data is transmitted
bogdanm 0:9b334a45a8ff 296 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
bogdanm 0:9b334a45a8ff 297 return status;
bogdanm 0:9b334a45a8ff 298 }
bogdanm 0:9b334a45a8ff 299
bogdanm 0:9b334a45a8ff 300 static inline void ssp_write(spi_t *obj, int value)
bogdanm 0:9b334a45a8ff 301 {
bogdanm 0:9b334a45a8ff 302 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 303 while (!ssp_writeable(obj));
bogdanm 0:9b334a45a8ff 304 if (obj->bits == SPI_DATASIZE_8BIT) {
bogdanm 0:9b334a45a8ff 305 // Force 8-bit access to the data register
bogdanm 0:9b334a45a8ff 306 uint8_t *p_spi_dr = 0;
bogdanm 0:9b334a45a8ff 307 p_spi_dr = (uint8_t *) & (spi->DR);
bogdanm 0:9b334a45a8ff 308 *p_spi_dr = (uint8_t)value;
bogdanm 0:9b334a45a8ff 309 } else { // SPI_DATASIZE_16BIT
bogdanm 0:9b334a45a8ff 310 spi->DR = (uint16_t)value;
bogdanm 0:9b334a45a8ff 311 }
bogdanm 0:9b334a45a8ff 312 }
bogdanm 0:9b334a45a8ff 313
bogdanm 0:9b334a45a8ff 314 static inline int ssp_read(spi_t *obj)
bogdanm 0:9b334a45a8ff 315 {
bogdanm 0:9b334a45a8ff 316 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 317 while (!ssp_readable(obj));
bogdanm 0:9b334a45a8ff 318 if (obj->bits == SPI_DATASIZE_8BIT) {
bogdanm 0:9b334a45a8ff 319 // Force 8-bit access to the data register
bogdanm 0:9b334a45a8ff 320 uint8_t *p_spi_dr = 0;
bogdanm 0:9b334a45a8ff 321 p_spi_dr = (uint8_t *) & (spi->DR);
bogdanm 0:9b334a45a8ff 322 return (int)(*p_spi_dr);
bogdanm 0:9b334a45a8ff 323 } else {
bogdanm 0:9b334a45a8ff 324 return (int)spi->DR;
bogdanm 0:9b334a45a8ff 325 }
bogdanm 0:9b334a45a8ff 326 }
bogdanm 0:9b334a45a8ff 327
bogdanm 0:9b334a45a8ff 328 static inline int ssp_busy(spi_t *obj)
bogdanm 0:9b334a45a8ff 329 {
bogdanm 0:9b334a45a8ff 330 int status;
bogdanm 0:9b334a45a8ff 331 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 332 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
bogdanm 0:9b334a45a8ff 333 return status;
bogdanm 0:9b334a45a8ff 334 }
bogdanm 0:9b334a45a8ff 335
bogdanm 0:9b334a45a8ff 336 int spi_master_write(spi_t *obj, int value)
bogdanm 0:9b334a45a8ff 337 {
bogdanm 0:9b334a45a8ff 338 ssp_write(obj, value);
bogdanm 0:9b334a45a8ff 339 return ssp_read(obj);
bogdanm 0:9b334a45a8ff 340 }
bogdanm 0:9b334a45a8ff 341
bogdanm 0:9b334a45a8ff 342 int spi_slave_receive(spi_t *obj)
bogdanm 0:9b334a45a8ff 343 {
bogdanm 0:9b334a45a8ff 344 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
bogdanm 0:9b334a45a8ff 345 };
bogdanm 0:9b334a45a8ff 346
bogdanm 0:9b334a45a8ff 347 int spi_slave_read(spi_t *obj)
bogdanm 0:9b334a45a8ff 348 {
bogdanm 0:9b334a45a8ff 349 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 350 while (!ssp_readable(obj));
bogdanm 0:9b334a45a8ff 351 if (obj->bits == SPI_DATASIZE_8BIT) {
bogdanm 0:9b334a45a8ff 352 // Force 8-bit access to the data register
bogdanm 0:9b334a45a8ff 353 uint8_t *p_spi_dr = 0;
bogdanm 0:9b334a45a8ff 354 p_spi_dr = (uint8_t *) & (spi->DR);
bogdanm 0:9b334a45a8ff 355 return (int)(*p_spi_dr);
bogdanm 0:9b334a45a8ff 356 } else {
bogdanm 0:9b334a45a8ff 357 return (int)spi->DR;
bogdanm 0:9b334a45a8ff 358 }
bogdanm 0:9b334a45a8ff 359 }
bogdanm 0:9b334a45a8ff 360
bogdanm 0:9b334a45a8ff 361 void spi_slave_write(spi_t *obj, int value)
bogdanm 0:9b334a45a8ff 362 {
bogdanm 0:9b334a45a8ff 363 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
bogdanm 0:9b334a45a8ff 364 while (!ssp_writeable(obj));
bogdanm 0:9b334a45a8ff 365 if (obj->bits == SPI_DATASIZE_8BIT) {
bogdanm 0:9b334a45a8ff 366 // Force 8-bit access to the data register
bogdanm 0:9b334a45a8ff 367 uint8_t *p_spi_dr = 0;
bogdanm 0:9b334a45a8ff 368 p_spi_dr = (uint8_t *) & (spi->DR);
bogdanm 0:9b334a45a8ff 369 *p_spi_dr = (uint8_t)value;
bogdanm 0:9b334a45a8ff 370 } else { // SPI_DATASIZE_16BIT
bogdanm 0:9b334a45a8ff 371 spi->DR = (uint16_t)value;
bogdanm 0:9b334a45a8ff 372 }
bogdanm 0:9b334a45a8ff 373 }
bogdanm 0:9b334a45a8ff 374
bogdanm 0:9b334a45a8ff 375 int spi_busy(spi_t *obj)
bogdanm 0:9b334a45a8ff 376 {
bogdanm 0:9b334a45a8ff 377 return ssp_busy(obj);
bogdanm 0:9b334a45a8ff 378 }
bogdanm 0:9b334a45a8ff 379
bogdanm 0:9b334a45a8ff 380 #endif