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targets/hal/TARGET_STM/TARGET_STM32F3/spi_api.c@636:cdb71f051ab2, 2016-04-14 (annotated)

Committer:
lzbpli
Date:
Thu Apr 14 06:45:56 2016 +0000
Revision:
636:cdb71f051ab2
Parent:
552:a1b9575155a3 
????stm32l0?l1?????????l0????12m

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 508:4f5903e025e6 1 /* mbed Microcontroller Library
mbed_official 508:4f5903e025e6 2 *******************************************************************************
mbed_official 508:4f5903e025e6 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 508:4f5903e025e6 4 * All rights reserved.
mbed_official 508:4f5903e025e6 5 *
mbed_official 508:4f5903e025e6 6 * Redistribution and use in source and binary forms, with or without
mbed_official 508:4f5903e025e6 7 * modification, are permitted provided that the following conditions are met:
mbed_official 508:4f5903e025e6 8 *
mbed_official 508:4f5903e025e6 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 508:4f5903e025e6 10 * this list of conditions and the following disclaimer.
mbed_official 508:4f5903e025e6 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 508:4f5903e025e6 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 508:4f5903e025e6 13 * and/or other materials provided with the distribution.
mbed_official 508:4f5903e025e6 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 508:4f5903e025e6 15 * may be used to endorse or promote products derived from this software
mbed_official 508:4f5903e025e6 16 * without specific prior written permission.
mbed_official 508:4f5903e025e6 17 *
mbed_official 508:4f5903e025e6 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 508:4f5903e025e6 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 508:4f5903e025e6 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 508:4f5903e025e6 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 508:4f5903e025e6 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 508:4f5903e025e6 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 508:4f5903e025e6 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 508:4f5903e025e6 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 508:4f5903e025e6 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 508:4f5903e025e6 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 508:4f5903e025e6 28 *******************************************************************************
mbed_official 508:4f5903e025e6 29 */
mbed_official 508:4f5903e025e6 30 #include "mbed_assert.h"
mbed_official 508:4f5903e025e6 31 #include "spi_api.h"
mbed_official 508:4f5903e025e6 32
mbed_official 508:4f5903e025e6 33 #if DEVICE_SPI
mbed_official 508:4f5903e025e6 34
mbed_official 508:4f5903e025e6 35 #include <math.h>
mbed_official 508:4f5903e025e6 36 #include "cmsis.h"
mbed_official 508:4f5903e025e6 37 #include "pinmap.h"
mbed_official 508:4f5903e025e6 38 #include "PeripheralPins.h"
mbed_official 508:4f5903e025e6 39
mbed_official 508:4f5903e025e6 40 static SPI_HandleTypeDef SpiHandle;
mbed_official 508:4f5903e025e6 41
mbed_official 508:4f5903e025e6 42 static void init_spi(spi_t *obj)
mbed_official 508:4f5903e025e6 43 {
mbed_official 508:4f5903e025e6 44 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 508:4f5903e025e6 45
mbed_official 508:4f5903e025e6 46 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 508:4f5903e025e6 47
mbed_official 508:4f5903e025e6 48 SpiHandle.Init.Mode = obj->mode;
mbed_official 508:4f5903e025e6 49 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 508:4f5903e025e6 50 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 508:4f5903e025e6 51 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 508:4f5903e025e6 52 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 508:4f5903e025e6 53 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 508:4f5903e025e6 54 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 508:4f5903e025e6 55 SpiHandle.Init.DataSize = obj->bits;
mbed_official 508:4f5903e025e6 56 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 508:4f5903e025e6 57 SpiHandle.Init.NSS = obj->nss;
mbed_official 508:4f5903e025e6 58 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 508:4f5903e025e6 59
mbed_official 508:4f5903e025e6 60 HAL_SPI_Init(&SpiHandle);
mbed_official 508:4f5903e025e6 61
mbed_official 508:4f5903e025e6 62 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 508:4f5903e025e6 63 }
mbed_official 508:4f5903e025e6 64
mbed_official 508:4f5903e025e6 65 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 508:4f5903e025e6 66 {
mbed_official 508:4f5903e025e6 67 // Determine the SPI to use
mbed_official 508:4f5903e025e6 68 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 508:4f5903e025e6 69 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 508:4f5903e025e6 70 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 508:4f5903e025e6 71 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 508:4f5903e025e6 72
mbed_official 508:4f5903e025e6 73 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 508:4f5903e025e6 74 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 508:4f5903e025e6 75
mbed_official 508:4f5903e025e6 76 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 508:4f5903e025e6 77 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 508:4f5903e025e6 78
mbed_official 508:4f5903e025e6 79 // Enable SPI clock
mbed_official 508:4f5903e025e6 80 #if defined(SPI1_BASE)
mbed_official 508:4f5903e025e6 81 if (obj->spi == SPI_1) {
mbed_official 508:4f5903e025e6 82 __SPI1_CLK_ENABLE();
mbed_official 508:4f5903e025e6 83 }
mbed_official 508:4f5903e025e6 84 #endif
mbed_official 508:4f5903e025e6 85
mbed_official 508:4f5903e025e6 86 #if defined(SPI2_BASE)
mbed_official 508:4f5903e025e6 87 if (obj->spi == SPI_2) {
mbed_official 508:4f5903e025e6 88 __SPI2_CLK_ENABLE();
mbed_official 508:4f5903e025e6 89 }
mbed_official 508:4f5903e025e6 90 #endif
mbed_official 508:4f5903e025e6 91
mbed_official 508:4f5903e025e6 92 #if defined(SPI3_BASE)
mbed_official 508:4f5903e025e6 93 if (obj->spi == SPI_3) {
mbed_official 508:4f5903e025e6 94 __SPI3_CLK_ENABLE();
mbed_official 508:4f5903e025e6 95 }
mbed_official 508:4f5903e025e6 96 #endif
mbed_official 508:4f5903e025e6 97
mbed_official 508:4f5903e025e6 98 // Configure the SPI pins
mbed_official 508:4f5903e025e6 99 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 508:4f5903e025e6 100 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 508:4f5903e025e6 101 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 508:4f5903e025e6 102
mbed_official 508:4f5903e025e6 103 // Save new values
mbed_official 508:4f5903e025e6 104 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 508:4f5903e025e6 105 obj->cpol = SPI_POLARITY_LOW;
mbed_official 508:4f5903e025e6 106 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 508:4f5903e025e6 107 #if defined(TARGET_STM32F334C8)
mbed_official 508:4f5903e025e6 108 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 508:4f5903e025e6 109 #else
mbed_official 508:4f5903e025e6 110 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz (HSI) or 1.13 MHz (HSE)
mbed_official 508:4f5903e025e6 111 #endif
mbed_official 508:4f5903e025e6 112
mbed_official 508:4f5903e025e6 113 obj->pin_miso = miso;
mbed_official 508:4f5903e025e6 114 obj->pin_mosi = mosi;
mbed_official 508:4f5903e025e6 115 obj->pin_sclk = sclk;
mbed_official 508:4f5903e025e6 116 obj->pin_ssel = ssel;
mbed_official 508:4f5903e025e6 117
mbed_official 552:a1b9575155a3 118 if (ssel != NC) {
mbed_official 552:a1b9575155a3 119 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 552:a1b9575155a3 120 } else {
mbed_official 508:4f5903e025e6 121 obj->nss = SPI_NSS_SOFT;
mbed_official 508:4f5903e025e6 122 }
mbed_official 508:4f5903e025e6 123
mbed_official 508:4f5903e025e6 124 init_spi(obj);
mbed_official 508:4f5903e025e6 125 }
mbed_official 508:4f5903e025e6 126
mbed_official 508:4f5903e025e6 127 void spi_free(spi_t *obj)
mbed_official 508:4f5903e025e6 128 {
mbed_official 508:4f5903e025e6 129 // Reset SPI and disable clock
mbed_official 508:4f5903e025e6 130 #if defined(SPI1_BASE)
mbed_official 508:4f5903e025e6 131 if (obj->spi == SPI_1) {
mbed_official 508:4f5903e025e6 132 __SPI1_FORCE_RESET();
mbed_official 508:4f5903e025e6 133 __SPI1_RELEASE_RESET();
mbed_official 508:4f5903e025e6 134 __SPI1_CLK_DISABLE();
mbed_official 508:4f5903e025e6 135 }
mbed_official 508:4f5903e025e6 136 #endif
mbed_official 508:4f5903e025e6 137
mbed_official 508:4f5903e025e6 138 #if defined(SPI2_BASE)
mbed_official 508:4f5903e025e6 139 if (obj->spi == SPI_2) {
mbed_official 508:4f5903e025e6 140 __SPI2_FORCE_RESET();
mbed_official 508:4f5903e025e6 141 __SPI2_RELEASE_RESET();
mbed_official 508:4f5903e025e6 142 __SPI2_CLK_DISABLE();
mbed_official 508:4f5903e025e6 143 }
mbed_official 508:4f5903e025e6 144 #endif
mbed_official 508:4f5903e025e6 145
mbed_official 508:4f5903e025e6 146 #if defined(SPI3_BASE)
mbed_official 508:4f5903e025e6 147 if (obj->spi == SPI_3) {
mbed_official 508:4f5903e025e6 148 __SPI3_FORCE_RESET();
mbed_official 508:4f5903e025e6 149 __SPI3_RELEASE_RESET();
mbed_official 508:4f5903e025e6 150 __SPI3_CLK_DISABLE();
mbed_official 508:4f5903e025e6 151 }
mbed_official 508:4f5903e025e6 152 #endif
mbed_official 508:4f5903e025e6 153
mbed_official 508:4f5903e025e6 154 // Configure GPIOs
mbed_official 508:4f5903e025e6 155 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 508:4f5903e025e6 156 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 508:4f5903e025e6 157 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 508:4f5903e025e6 158 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 508:4f5903e025e6 159 }
mbed_official 508:4f5903e025e6 160
mbed_official 508:4f5903e025e6 161 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 508:4f5903e025e6 162 {
mbed_official 508:4f5903e025e6 163 // Save new values
mbed_official 508:4f5903e025e6 164 if (bits == 16) {
mbed_official 508:4f5903e025e6 165 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 508:4f5903e025e6 166 } else {
mbed_official 508:4f5903e025e6 167 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 508:4f5903e025e6 168 }
mbed_official 508:4f5903e025e6 169
mbed_official 508:4f5903e025e6 170 switch (mode) {
mbed_official 508:4f5903e025e6 171 case 0:
mbed_official 508:4f5903e025e6 172 obj->cpol = SPI_POLARITY_LOW;
mbed_official 508:4f5903e025e6 173 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 508:4f5903e025e6 174 break;
mbed_official 508:4f5903e025e6 175 case 1:
mbed_official 508:4f5903e025e6 176 obj->cpol = SPI_POLARITY_LOW;
mbed_official 508:4f5903e025e6 177 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 508:4f5903e025e6 178 break;
mbed_official 508:4f5903e025e6 179 case 2:
mbed_official 508:4f5903e025e6 180 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 508:4f5903e025e6 181 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 508:4f5903e025e6 182 break;
mbed_official 508:4f5903e025e6 183 default:
mbed_official 508:4f5903e025e6 184 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 508:4f5903e025e6 185 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 508:4f5903e025e6 186 break;
mbed_official 508:4f5903e025e6 187 }
mbed_official 508:4f5903e025e6 188
mbed_official 552:a1b9575155a3 189 if (obj->nss != SPI_NSS_SOFT) {
mbed_official 552:a1b9575155a3 190 obj->nss = (slave) ? SPI_NSS_HARD_INPUT : SPI_NSS_HARD_OUTPUT;
mbed_official 508:4f5903e025e6 191 }
mbed_official 508:4f5903e025e6 192
mbed_official 552:a1b9575155a3 193 obj->mode = (slave) ? SPI_MODE_SLAVE : SPI_MODE_MASTER;
mbed_official 552:a1b9575155a3 194
mbed_official 508:4f5903e025e6 195 init_spi(obj);
mbed_official 508:4f5903e025e6 196 }
mbed_official 508:4f5903e025e6 197
mbed_official 508:4f5903e025e6 198 void spi_frequency(spi_t *obj, int hz)
mbed_official 508:4f5903e025e6 199 {
mbed_official 508:4f5903e025e6 200 #if defined(TARGET_STM32F334C8)
mbed_official 508:4f5903e025e6 201 // Values depend of APB2CLK : 64 MHz if HSI is used, 72 MHz if HSE is used
mbed_official 508:4f5903e025e6 202 if (hz < 500000) {
mbed_official 508:4f5903e025e6 203 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 250 kHz - 281 kHz
mbed_official 508:4f5903e025e6 204 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 508:4f5903e025e6 205 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 500 kHz - 563 kHz
mbed_official 508:4f5903e025e6 206 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 508:4f5903e025e6 207 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1 MHz - 1.13 MHz
mbed_official 508:4f5903e025e6 208 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 508:4f5903e025e6 209 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2 MHz - 2.25 MHz
mbed_official 508:4f5903e025e6 210 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 508:4f5903e025e6 211 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 4 MHz - 4.5 MHz
mbed_official 508:4f5903e025e6 212 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 508:4f5903e025e6 213 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 8 MHz - 9 MHz
mbed_official 508:4f5903e025e6 214 } else if ((hz >= 16000000) && (hz < 32000000)) {
mbed_official 508:4f5903e025e6 215 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 16 MHz - 18 MHz
mbed_official 508:4f5903e025e6 216 } else { // >= 32000000
mbed_official 508:4f5903e025e6 217 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 32 MHz - 36 MHz
mbed_official 508:4f5903e025e6 218 }
mbed_official 508:4f5903e025e6 219 #elif defined(TARGET_STM32F302R8)
mbed_official 544:1af5f1c39e80 220 if (hz < 250000) {
mbed_official 508:4f5903e025e6 221 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 125 kHz - 141 kHz
mbed_official 508:4f5903e025e6 222 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 508:4f5903e025e6 223 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 250 kHz - 280 kHz
mbed_official 508:4f5903e025e6 224 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 508:4f5903e025e6 225 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 500 kHz - 560 kHz
mbed_official 508:4f5903e025e6 226 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 508:4f5903e025e6 227 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz - 1.13 MHz
mbed_official 508:4f5903e025e6 228 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 508:4f5903e025e6 229 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2 MHz - 2.25 MHz
mbed_official 508:4f5903e025e6 230 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 508:4f5903e025e6 231 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 4 MHz - 4.5 MHz
mbed_official 508:4f5903e025e6 232 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 508:4f5903e025e6 233 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 8 MHz - 9 MHz
mbed_official 508:4f5903e025e6 234 } else { // >= 16000000
mbed_official 508:4f5903e025e6 235 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 16 MHz - 18 MHz
mbed_official 508:4f5903e025e6 236 }
mbed_official 544:1af5f1c39e80 237
mbed_official 508:4f5903e025e6 238 #else
mbed_official 508:4f5903e025e6 239 // Values depend of APB1CLK and APB2CLK : 32 MHz if HSI is used, 36 MHz if HSE is used
mbed_official 508:4f5903e025e6 240 if (obj->spi == SPI_1) {
mbed_official 508:4f5903e025e6 241 if (hz < 500000) {
mbed_official 508:4f5903e025e6 242 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 250 kHz - 280 kHz
mbed_official 508:4f5903e025e6 243 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 508:4f5903e025e6 244 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 500 kHz - 560 kHz
mbed_official 508:4f5903e025e6 245 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 508:4f5903e025e6 246 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1 MHz - 1.13 MHz
mbed_official 508:4f5903e025e6 247 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 508:4f5903e025e6 248 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2 MHz - 2.25 MHz
mbed_official 508:4f5903e025e6 249 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 508:4f5903e025e6 250 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 4 MHz - 4.5 MHz
mbed_official 508:4f5903e025e6 251 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 508:4f5903e025e6 252 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 8 MHz - 9 MHz
mbed_official 508:4f5903e025e6 253 } else if ((hz >= 16000000) && (hz < 32000000)) {
mbed_official 508:4f5903e025e6 254 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 16 MHz - 18 MHz
mbed_official 508:4f5903e025e6 255 } else { // >= 32000000
mbed_official 508:4f5903e025e6 256 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 32 MHz - 36 MHz
mbed_official 544:1af5f1c39e80 257 }
mbed_official 508:4f5903e025e6 258 } else {
mbed_official 508:4f5903e025e6 259 if (hz < 250000) {
mbed_official 508:4f5903e025e6 260 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 125 kHz - 141 kHz
mbed_official 508:4f5903e025e6 261 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 508:4f5903e025e6 262 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 250 kHz - 280 kHz
mbed_official 508:4f5903e025e6 263 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 508:4f5903e025e6 264 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 500 kHz - 560 kHz
mbed_official 508:4f5903e025e6 265 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 508:4f5903e025e6 266 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1 MHz - 1.13 MHz
mbed_official 508:4f5903e025e6 267 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 508:4f5903e025e6 268 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 2 MHz - 2.25 MHz
mbed_official 508:4f5903e025e6 269 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 508:4f5903e025e6 270 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 4 MHz - 4.5 MHz
mbed_official 508:4f5903e025e6 271 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 508:4f5903e025e6 272 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 8 MHz - 9 MHz
mbed_official 508:4f5903e025e6 273 } else { // >= 16000000
mbed_official 508:4f5903e025e6 274 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 16 MHz - 18 MHz
mbed_official 508:4f5903e025e6 275 }
mbed_official 508:4f5903e025e6 276 }
mbed_official 508:4f5903e025e6 277 #endif
mbed_official 508:4f5903e025e6 278
mbed_official 508:4f5903e025e6 279 init_spi(obj);
mbed_official 508:4f5903e025e6 280 }
mbed_official 508:4f5903e025e6 281
mbed_official 508:4f5903e025e6 282 static inline int ssp_readable(spi_t *obj)
mbed_official 508:4f5903e025e6 283 {
mbed_official 508:4f5903e025e6 284 int status;
mbed_official 508:4f5903e025e6 285 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 508:4f5903e025e6 286 // Check if data is received
mbed_official 508:4f5903e025e6 287 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 508:4f5903e025e6 288 return status;
mbed_official 508:4f5903e025e6 289 }
mbed_official 508:4f5903e025e6 290
mbed_official 508:4f5903e025e6 291 static inline int ssp_writeable(spi_t *obj)
mbed_official 508:4f5903e025e6 292 {
mbed_official 508:4f5903e025e6 293 int status;
mbed_official 508:4f5903e025e6 294 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 508:4f5903e025e6 295 // Check if data is transmitted
mbed_official 508:4f5903e025e6 296 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 508:4f5903e025e6 297 return status;
mbed_official 508:4f5903e025e6 298 }
mbed_official 508:4f5903e025e6 299
mbed_official 508:4f5903e025e6 300 static inline void ssp_write(spi_t *obj, int value)
mbed_official 508:4f5903e025e6 301 {
mbed_official 508:4f5903e025e6 302 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 508:4f5903e025e6 303 while (!ssp_writeable(obj));
mbed_official 508:4f5903e025e6 304 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 508:4f5903e025e6 305 // Force 8-bit access to the data register
mbed_official 508:4f5903e025e6 306 uint8_t *p_spi_dr = 0;
mbed_official 508:4f5903e025e6 307 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 508:4f5903e025e6 308 *p_spi_dr = (uint8_t)value;
mbed_official 508:4f5903e025e6 309 } else { // SPI_DATASIZE_16BIT
mbed_official 508:4f5903e025e6 310 spi->DR = (uint16_t)value;
mbed_official 508:4f5903e025e6 311 }
mbed_official 508:4f5903e025e6 312 }
mbed_official 508:4f5903e025e6 313
mbed_official 508:4f5903e025e6 314 static inline int ssp_read(spi_t *obj)
mbed_official 508:4f5903e025e6 315 {
mbed_official 508:4f5903e025e6 316 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 508:4f5903e025e6 317 while (!ssp_readable(obj));
mbed_official 508:4f5903e025e6 318 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 508:4f5903e025e6 319 // Force 8-bit access to the data register
mbed_official 508:4f5903e025e6 320 uint8_t *p_spi_dr = 0;
mbed_official 508:4f5903e025e6 321 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 508:4f5903e025e6 322 return (int)(*p_spi_dr);
mbed_official 508:4f5903e025e6 323 } else {
mbed_official 508:4f5903e025e6 324 return (int)spi->DR;
mbed_official 508:4f5903e025e6 325 }
mbed_official 508:4f5903e025e6 326 }
mbed_official 508:4f5903e025e6 327
mbed_official 508:4f5903e025e6 328 static inline int ssp_busy(spi_t *obj)
mbed_official 508:4f5903e025e6 329 {
mbed_official 508:4f5903e025e6 330 int status;
mbed_official 508:4f5903e025e6 331 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 508:4f5903e025e6 332 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 508:4f5903e025e6 333 return status;
mbed_official 508:4f5903e025e6 334 }
mbed_official 508:4f5903e025e6 335
mbed_official 508:4f5903e025e6 336 int spi_master_write(spi_t *obj, int value)
mbed_official 508:4f5903e025e6 337 {
mbed_official 508:4f5903e025e6 338 ssp_write(obj, value);
mbed_official 508:4f5903e025e6 339 return ssp_read(obj);
mbed_official 508:4f5903e025e6 340 }
mbed_official 508:4f5903e025e6 341
mbed_official 508:4f5903e025e6 342 int spi_slave_receive(spi_t *obj)
mbed_official 508:4f5903e025e6 343 {
mbed_official 508:4f5903e025e6 344 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 508:4f5903e025e6 345 };
mbed_official 508:4f5903e025e6 346
mbed_official 508:4f5903e025e6 347 int spi_slave_read(spi_t *obj)
mbed_official 508:4f5903e025e6 348 {
mbed_official 508:4f5903e025e6 349 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 508:4f5903e025e6 350 while (!ssp_readable(obj));
mbed_official 508:4f5903e025e6 351 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 508:4f5903e025e6 352 // Force 8-bit access to the data register
mbed_official 508:4f5903e025e6 353 uint8_t *p_spi_dr = 0;
mbed_official 508:4f5903e025e6 354 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 508:4f5903e025e6 355 return (int)(*p_spi_dr);
mbed_official 508:4f5903e025e6 356 } else {
mbed_official 508:4f5903e025e6 357 return (int)spi->DR;
mbed_official 508:4f5903e025e6 358 }
mbed_official 508:4f5903e025e6 359 }
mbed_official 508:4f5903e025e6 360
mbed_official 508:4f5903e025e6 361 void spi_slave_write(spi_t *obj, int value)
mbed_official 508:4f5903e025e6 362 {
mbed_official 508:4f5903e025e6 363 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 508:4f5903e025e6 364 while (!ssp_writeable(obj));
mbed_official 508:4f5903e025e6 365 if (obj->bits == SPI_DATASIZE_8BIT) {
mbed_official 508:4f5903e025e6 366 // Force 8-bit access to the data register
mbed_official 508:4f5903e025e6 367 uint8_t *p_spi_dr = 0;
mbed_official 508:4f5903e025e6 368 p_spi_dr = (uint8_t *) & (spi->DR);
mbed_official 508:4f5903e025e6 369 *p_spi_dr = (uint8_t)value;
mbed_official 508:4f5903e025e6 370 } else { // SPI_DATASIZE_16BIT
mbed_official 508:4f5903e025e6 371 spi->DR = (uint16_t)value;
mbed_official 508:4f5903e025e6 372 }
mbed_official 508:4f5903e025e6 373 }
mbed_official 508:4f5903e025e6 374
mbed_official 508:4f5903e025e6 375 int spi_busy(spi_t *obj)
mbed_official 508:4f5903e025e6 376 {
mbed_official 508:4f5903e025e6 377 return ssp_busy(obj);
mbed_official 508:4f5903e025e6 378 }
mbed_official 508:4f5903e025e6 379
mbed_official 508:4f5903e025e6 380 #endif