Ken Todotani / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_STM32F407VG/spi_api.c@296:ec1b66a3d094, 2014-08-21 (annotated)

Committer:
mbed_official
Date:
Thu Aug 21 15:00:08 2014 +0100
Revision:
296:ec1b66a3d094
Parent:
targets/hal/TARGET_STM/TARGET_DISCO_F407VG/spi_api.c@242:7074e42da0b2 
Synchronized with git revision bbc120c4786e99dfa586e7a13f8638064f1e5938



Full URL: https://github.com/mbedmicro/mbed/commit/bbc120c4786e99dfa586e7a13f8638064f1e5938/



DISCO_F407VG - add USBDevice support and a variant - ARCH_MAX

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 133:d4dda5c437f0 1 /* mbed Microcontroller Library
mbed_official 133:d4dda5c437f0 2 *******************************************************************************
mbed_official 133:d4dda5c437f0 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 133:d4dda5c437f0 4 * All rights reserved.
mbed_official 133:d4dda5c437f0 5 *
mbed_official 133:d4dda5c437f0 6 * Redistribution and use in source and binary forms, with or without
mbed_official 133:d4dda5c437f0 7 * modification, are permitted provided that the following conditions are met:
mbed_official 133:d4dda5c437f0 8 *
mbed_official 133:d4dda5c437f0 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 133:d4dda5c437f0 10 * this list of conditions and the following disclaimer.
mbed_official 133:d4dda5c437f0 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 133:d4dda5c437f0 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 133:d4dda5c437f0 13 * and/or other materials provided with the distribution.
mbed_official 133:d4dda5c437f0 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 133:d4dda5c437f0 15 * may be used to endorse or promote products derived from this software
mbed_official 133:d4dda5c437f0 16 * without specific prior written permission.
mbed_official 133:d4dda5c437f0 17 *
mbed_official 133:d4dda5c437f0 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 133:d4dda5c437f0 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 133:d4dda5c437f0 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 133:d4dda5c437f0 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 133:d4dda5c437f0 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 133:d4dda5c437f0 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 133:d4dda5c437f0 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 133:d4dda5c437f0 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 133:d4dda5c437f0 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 133:d4dda5c437f0 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 133:d4dda5c437f0 28 *******************************************************************************
mbed_official 133:d4dda5c437f0 29 */
mbed_official 242:7074e42da0b2 30 #include "mbed_assert.h"
mbed_official 133:d4dda5c437f0 31 #include "spi_api.h"
mbed_official 133:d4dda5c437f0 32
mbed_official 133:d4dda5c437f0 33 #if DEVICE_SPI
mbed_official 133:d4dda5c437f0 34
mbed_official 133:d4dda5c437f0 35 #include <math.h>
mbed_official 133:d4dda5c437f0 36 #include "cmsis.h"
mbed_official 133:d4dda5c437f0 37 #include "pinmap.h"
mbed_official 133:d4dda5c437f0 38
mbed_official 133:d4dda5c437f0 39 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 133:d4dda5c437f0 40 {PA_7, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 133:d4dda5c437f0 41 {PB_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 242:7074e42da0b2 42 // {PB_5, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 133:d4dda5c437f0 43 {PB_15, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 44 {PC_3, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 45 {PC_12, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 133:d4dda5c437f0 46 {NC, NC, 0}
mbed_official 133:d4dda5c437f0 47 };
mbed_official 133:d4dda5c437f0 48
mbed_official 133:d4dda5c437f0 49 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 133:d4dda5c437f0 50 {PA_6, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 133:d4dda5c437f0 51 {PB_4, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 242:7074e42da0b2 52 // {PB_4, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 133:d4dda5c437f0 53 {PB_14, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 54 {PC_2, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 55 {PC_11, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 133:d4dda5c437f0 56 {NC, NC, 0}
mbed_official 133:d4dda5c437f0 57 };
mbed_official 133:d4dda5c437f0 58
mbed_official 133:d4dda5c437f0 59 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 133:d4dda5c437f0 60 {PA_5, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 133:d4dda5c437f0 61 {PB_3, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI1)},
mbed_official 242:7074e42da0b2 62 // {PB_3, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 133:d4dda5c437f0 63 {PB_10, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 64 {PB_13, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 65 {PC_10, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF6_SPI3)},
mbed_official 133:d4dda5c437f0 66 {NC, NC, 0}
mbed_official 133:d4dda5c437f0 67 };
mbed_official 133:d4dda5c437f0 68
mbed_official 133:d4dda5c437f0 69 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 242:7074e42da0b2 70 {PA_4, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF5_SPI1)},
mbed_official 242:7074e42da0b2 71 // {PA_4, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF6_SPI3)},
mbed_official 242:7074e42da0b2 72 {PA_15, SPI_1, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF5_SPI1)},
mbed_official 242:7074e42da0b2 73 // {PA_15, SPI_3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF6_SPI3)},
mbed_official 242:7074e42da0b2 74 {PB_9, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF5_SPI2)},
mbed_official 242:7074e42da0b2 75 {PB_12, SPI_2, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_NOPULL, GPIO_AF5_SPI2)},
mbed_official 133:d4dda5c437f0 76 {NC, NC, 0}
mbed_official 133:d4dda5c437f0 77 };
mbed_official 133:d4dda5c437f0 78
mbed_official 133:d4dda5c437f0 79 static SPI_HandleTypeDef SpiHandle;
mbed_official 133:d4dda5c437f0 80
mbed_official 133:d4dda5c437f0 81 static void init_spi(spi_t *obj) {
mbed_official 133:d4dda5c437f0 82 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 83
mbed_official 133:d4dda5c437f0 84 __HAL_SPI_DISABLE(&SpiHandle);
mbed_official 133:d4dda5c437f0 85
mbed_official 133:d4dda5c437f0 86 SpiHandle.Init.Mode = obj->mode;
mbed_official 133:d4dda5c437f0 87 SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
mbed_official 133:d4dda5c437f0 88 SpiHandle.Init.Direction = SPI_DIRECTION_2LINES;
mbed_official 133:d4dda5c437f0 89 SpiHandle.Init.CLKPhase = obj->cpha;
mbed_official 133:d4dda5c437f0 90 SpiHandle.Init.CLKPolarity = obj->cpol;
mbed_official 133:d4dda5c437f0 91 SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLED;
mbed_official 133:d4dda5c437f0 92 SpiHandle.Init.CRCPolynomial = 7;
mbed_official 133:d4dda5c437f0 93 SpiHandle.Init.DataSize = obj->bits;
mbed_official 133:d4dda5c437f0 94 SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
mbed_official 133:d4dda5c437f0 95 SpiHandle.Init.NSS = obj->nss;
mbed_official 133:d4dda5c437f0 96 SpiHandle.Init.TIMode = SPI_TIMODE_DISABLED;
mbed_official 133:d4dda5c437f0 97
mbed_official 133:d4dda5c437f0 98 HAL_SPI_Init(&SpiHandle);
mbed_official 133:d4dda5c437f0 99
mbed_official 133:d4dda5c437f0 100 __HAL_SPI_ENABLE(&SpiHandle);
mbed_official 133:d4dda5c437f0 101 }
mbed_official 133:d4dda5c437f0 102
mbed_official 133:d4dda5c437f0 103 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 133:d4dda5c437f0 104 // Determine the SPI to use
mbed_official 133:d4dda5c437f0 105 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 133:d4dda5c437f0 106 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 133:d4dda5c437f0 107 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 133:d4dda5c437f0 108 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 133:d4dda5c437f0 109
mbed_official 133:d4dda5c437f0 110 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 133:d4dda5c437f0 111 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 133:d4dda5c437f0 112
mbed_official 133:d4dda5c437f0 113 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 227:7bd0639b8911 114 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 133:d4dda5c437f0 115
mbed_official 133:d4dda5c437f0 116 // Enable SPI clock
mbed_official 133:d4dda5c437f0 117 if (obj->spi == SPI_1) {
mbed_official 133:d4dda5c437f0 118 __SPI1_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 119 }
mbed_official 133:d4dda5c437f0 120 if (obj->spi == SPI_2) {
mbed_official 133:d4dda5c437f0 121 __SPI2_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 122 }
mbed_official 133:d4dda5c437f0 123 if (obj->spi == SPI_3) {
mbed_official 133:d4dda5c437f0 124 __SPI3_CLK_ENABLE();
mbed_official 133:d4dda5c437f0 125 }
mbed_official 133:d4dda5c437f0 126
mbed_official 133:d4dda5c437f0 127 // Configure the SPI pins
mbed_official 133:d4dda5c437f0 128 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 133:d4dda5c437f0 129 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 133:d4dda5c437f0 130 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 133:d4dda5c437f0 131
mbed_official 133:d4dda5c437f0 132 // Save new values
mbed_official 133:d4dda5c437f0 133 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 133:d4dda5c437f0 134 obj->cpol = SPI_POLARITY_LOW;
mbed_official 133:d4dda5c437f0 135 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 133:d4dda5c437f0 136 obj->br_presc = SPI_BAUDRATEPRESCALER_256;
mbed_official 133:d4dda5c437f0 137
mbed_official 242:7074e42da0b2 138 obj->pin_miso = miso;
mbed_official 242:7074e42da0b2 139 obj->pin_mosi = mosi;
mbed_official 242:7074e42da0b2 140 obj->pin_sclk = sclk;
mbed_official 242:7074e42da0b2 141 obj->pin_ssel = ssel;
mbed_official 242:7074e42da0b2 142
mbed_official 133:d4dda5c437f0 143 if (ssel == NC) { // SW NSS Master mode
mbed_official 133:d4dda5c437f0 144 obj->mode = SPI_MODE_MASTER;
mbed_official 133:d4dda5c437f0 145 obj->nss = SPI_NSS_SOFT;
mbed_official 242:7074e42da0b2 146 } else { // Slave
mbed_official 133:d4dda5c437f0 147 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 133:d4dda5c437f0 148 obj->mode = SPI_MODE_SLAVE;
mbed_official 133:d4dda5c437f0 149 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 133:d4dda5c437f0 150 }
mbed_official 133:d4dda5c437f0 151
mbed_official 133:d4dda5c437f0 152 init_spi(obj);
mbed_official 133:d4dda5c437f0 153 }
mbed_official 133:d4dda5c437f0 154
mbed_official 133:d4dda5c437f0 155 void spi_free(spi_t *obj) {
mbed_official 242:7074e42da0b2 156 // Reset SPI and disable clock
mbed_official 242:7074e42da0b2 157 if (obj->spi == SPI_1) {
mbed_official 242:7074e42da0b2 158 __SPI1_FORCE_RESET();
mbed_official 242:7074e42da0b2 159 __SPI1_RELEASE_RESET();
mbed_official 242:7074e42da0b2 160 __SPI1_CLK_DISABLE();
mbed_official 242:7074e42da0b2 161 }
mbed_official 242:7074e42da0b2 162
mbed_official 242:7074e42da0b2 163 if (obj->spi == SPI_2) {
mbed_official 242:7074e42da0b2 164 __SPI2_FORCE_RESET();
mbed_official 242:7074e42da0b2 165 __SPI2_RELEASE_RESET();
mbed_official 242:7074e42da0b2 166 __SPI2_CLK_DISABLE();
mbed_official 242:7074e42da0b2 167 }
mbed_official 242:7074e42da0b2 168
mbed_official 242:7074e42da0b2 169 if (obj->spi == SPI_3) {
mbed_official 242:7074e42da0b2 170 __SPI3_FORCE_RESET();
mbed_official 242:7074e42da0b2 171 __SPI3_RELEASE_RESET();
mbed_official 242:7074e42da0b2 172 __SPI3_CLK_DISABLE();
mbed_official 242:7074e42da0b2 173 }
mbed_official 242:7074e42da0b2 174
mbed_official 242:7074e42da0b2 175 // Configure GPIOs
mbed_official 242:7074e42da0b2 176 pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 242:7074e42da0b2 177 pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 242:7074e42da0b2 178 pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 242:7074e42da0b2 179 pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
mbed_official 133:d4dda5c437f0 180 }
mbed_official 133:d4dda5c437f0 181
mbed_official 227:7bd0639b8911 182 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 133:d4dda5c437f0 183 // Save new values
mbed_official 242:7074e42da0b2 184 if (bits == 16) {
mbed_official 242:7074e42da0b2 185 obj->bits = SPI_DATASIZE_16BIT;
mbed_official 242:7074e42da0b2 186 } else {
mbed_official 133:d4dda5c437f0 187 obj->bits = SPI_DATASIZE_8BIT;
mbed_official 133:d4dda5c437f0 188 }
mbed_official 133:d4dda5c437f0 189
mbed_official 133:d4dda5c437f0 190 switch (mode) {
mbed_official 133:d4dda5c437f0 191 case 0:
mbed_official 133:d4dda5c437f0 192 obj->cpol = SPI_POLARITY_LOW;
mbed_official 133:d4dda5c437f0 193 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 133:d4dda5c437f0 194 break;
mbed_official 133:d4dda5c437f0 195 case 1:
mbed_official 133:d4dda5c437f0 196 obj->cpol = SPI_POLARITY_LOW;
mbed_official 133:d4dda5c437f0 197 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 133:d4dda5c437f0 198 break;
mbed_official 133:d4dda5c437f0 199 case 2:
mbed_official 133:d4dda5c437f0 200 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 227:7bd0639b8911 201 obj->cpha = SPI_PHASE_1EDGE;
mbed_official 133:d4dda5c437f0 202 break;
mbed_official 133:d4dda5c437f0 203 default:
mbed_official 133:d4dda5c437f0 204 obj->cpol = SPI_POLARITY_HIGH;
mbed_official 227:7bd0639b8911 205 obj->cpha = SPI_PHASE_2EDGE;
mbed_official 133:d4dda5c437f0 206 break;
mbed_official 133:d4dda5c437f0 207 }
mbed_official 133:d4dda5c437f0 208
mbed_official 133:d4dda5c437f0 209 if (slave == 0) {
mbed_official 133:d4dda5c437f0 210 obj->mode = SPI_MODE_MASTER;
mbed_official 133:d4dda5c437f0 211 obj->nss = SPI_NSS_SOFT;
mbed_official 242:7074e42da0b2 212 } else {
mbed_official 133:d4dda5c437f0 213 obj->mode = SPI_MODE_SLAVE;
mbed_official 227:7bd0639b8911 214 obj->nss = SPI_NSS_HARD_INPUT;
mbed_official 133:d4dda5c437f0 215 }
mbed_official 133:d4dda5c437f0 216
mbed_official 133:d4dda5c437f0 217 init_spi(obj);
mbed_official 133:d4dda5c437f0 218 }
mbed_official 133:d4dda5c437f0 219
mbed_official 133:d4dda5c437f0 220 void spi_frequency(spi_t *obj, int hz) {
mbed_official 133:d4dda5c437f0 221 // Note: The frequencies are obtained with SPI1 clock = 84 MHz (APB2 clock)
mbed_official 133:d4dda5c437f0 222 if (hz < 600000) {
mbed_official 133:d4dda5c437f0 223 obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 330 kHz
mbed_official 242:7074e42da0b2 224 } else if ((hz >= 600000) && (hz < 1000000)) {
mbed_official 133:d4dda5c437f0 225 obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 656 kHz
mbed_official 242:7074e42da0b2 226 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 133:d4dda5c437f0 227 obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.3 MHz
mbed_official 242:7074e42da0b2 228 } else if ((hz >= 2000000) && (hz < 5000000)) {
mbed_official 133:d4dda5c437f0 229 obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2.6 MHz
mbed_official 242:7074e42da0b2 230 } else if ((hz >= 5000000) && (hz < 10000000)) {
mbed_official 133:d4dda5c437f0 231 obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 5.25 MHz
mbed_official 242:7074e42da0b2 232 } else if ((hz >= 10000000) && (hz < 21000000)) {
mbed_official 133:d4dda5c437f0 233 obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 10.5 MHz
mbed_official 242:7074e42da0b2 234 } else if ((hz >= 21000000) && (hz < 42000000)) {
mbed_official 133:d4dda5c437f0 235 obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 21 MHz
mbed_official 242:7074e42da0b2 236 } else { // >= 42000000
mbed_official 133:d4dda5c437f0 237 obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 42 MHz
mbed_official 133:d4dda5c437f0 238 }
mbed_official 133:d4dda5c437f0 239 init_spi(obj);
mbed_official 133:d4dda5c437f0 240 }
mbed_official 133:d4dda5c437f0 241
mbed_official 133:d4dda5c437f0 242 static inline int ssp_readable(spi_t *obj) {
mbed_official 133:d4dda5c437f0 243 int status;
mbed_official 133:d4dda5c437f0 244 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 245 // Check if data is received
mbed_official 133:d4dda5c437f0 246 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 227:7bd0639b8911 247 return status;
mbed_official 133:d4dda5c437f0 248 }
mbed_official 133:d4dda5c437f0 249
mbed_official 133:d4dda5c437f0 250 static inline int ssp_writeable(spi_t *obj) {
mbed_official 133:d4dda5c437f0 251 int status;
mbed_official 133:d4dda5c437f0 252 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 253 // Check if data is transmitted
mbed_official 133:d4dda5c437f0 254 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 133:d4dda5c437f0 255 return status;
mbed_official 133:d4dda5c437f0 256 }
mbed_official 133:d4dda5c437f0 257
mbed_official 133:d4dda5c437f0 258 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 133:d4dda5c437f0 259 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 260 while (!ssp_writeable(obj));
mbed_official 133:d4dda5c437f0 261 spi->DR = (uint16_t)value;
mbed_official 133:d4dda5c437f0 262 }
mbed_official 133:d4dda5c437f0 263
mbed_official 133:d4dda5c437f0 264 static inline int ssp_read(spi_t *obj) {
mbed_official 133:d4dda5c437f0 265 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 266 while (!ssp_readable(obj));
mbed_official 133:d4dda5c437f0 267 return (int)spi->DR;
mbed_official 133:d4dda5c437f0 268 }
mbed_official 133:d4dda5c437f0 269
mbed_official 133:d4dda5c437f0 270 static inline int ssp_busy(spi_t *obj) {
mbed_official 133:d4dda5c437f0 271 int status;
mbed_official 133:d4dda5c437f0 272 SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 273 status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 133:d4dda5c437f0 274 return status;
mbed_official 133:d4dda5c437f0 275 }
mbed_official 133:d4dda5c437f0 276
mbed_official 133:d4dda5c437f0 277 int spi_master_write(spi_t *obj, int value) {
mbed_official 133:d4dda5c437f0 278 ssp_write(obj, value);
mbed_official 133:d4dda5c437f0 279 return ssp_read(obj);
mbed_official 133:d4dda5c437f0 280 }
mbed_official 133:d4dda5c437f0 281
mbed_official 133:d4dda5c437f0 282 int spi_slave_receive(spi_t *obj) {
mbed_official 242:7074e42da0b2 283 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 133:d4dda5c437f0 284 };
mbed_official 133:d4dda5c437f0 285
mbed_official 133:d4dda5c437f0 286 int spi_slave_read(spi_t *obj) {
mbed_official 133:d4dda5c437f0 287 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 242:7074e42da0b2 288 while (!ssp_readable(obj));
mbed_official 133:d4dda5c437f0 289 return (int)spi->DR;
mbed_official 133:d4dda5c437f0 290 }
mbed_official 133:d4dda5c437f0 291
mbed_official 133:d4dda5c437f0 292 void spi_slave_write(spi_t *obj, int value) {
mbed_official 133:d4dda5c437f0 293 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 133:d4dda5c437f0 294 while (!ssp_writeable(obj));
mbed_official 133:d4dda5c437f0 295 spi->DR = (uint16_t)value;
mbed_official 133:d4dda5c437f0 296 }
mbed_official 133:d4dda5c437f0 297
mbed_official 133:d4dda5c437f0 298 int spi_busy(spi_t *obj) {
mbed_official 133:d4dda5c437f0 299 return ssp_busy(obj);
mbed_official 133:d4dda5c437f0 300 }
mbed_official 133:d4dda5c437f0 301
mbed_official 133:d4dda5c437f0 302 #endif