shinichi nakazawa / mbed-src

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Dependents:   Nucleo_blink_led

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F103RB/spi_api.c@402:09075a3b15e3, 2014-11-14 (annotated)

Committer:
mbed_official
Date:
Fri Nov 14 09:00:07 2014 +0000
Revision:
402:09075a3b15e3
Parent:
233:1bbc1451db33
Child:
414:4ec4c5b614b0
Synchronized with git revision dffeedc96e731e30785ca4a7842fb9769412bea1



Full URL: https://github.com/mbedmicro/mbed/commit/dffeedc96e731e30785ca4a7842fb9769412bea1/



Targets: add USBTX and USBRX pin definitions for targets that don't provide them

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 52:a51c77007319 1 /* mbed Microcontroller Library
mbed_official 70:c1fbde68b492 2 *******************************************************************************
mbed_official 70:c1fbde68b492 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 70:c1fbde68b492 4 * All rights reserved.
mbed_official 52:a51c77007319 5 *
mbed_official 70:c1fbde68b492 6 * Redistribution and use in source and binary forms, with or without
mbed_official 70:c1fbde68b492 7 * modification, are permitted provided that the following conditions are met:
mbed_official 52:a51c77007319 8 *
mbed_official 70:c1fbde68b492 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 70:c1fbde68b492 10 * this list of conditions and the following disclaimer.
mbed_official 70:c1fbde68b492 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 70:c1fbde68b492 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 70:c1fbde68b492 13 * and/or other materials provided with the distribution.
mbed_official 70:c1fbde68b492 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 70:c1fbde68b492 15 * may be used to endorse or promote products derived from this software
mbed_official 70:c1fbde68b492 16 * without specific prior written permission.
mbed_official 52:a51c77007319 17 *
mbed_official 70:c1fbde68b492 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 70:c1fbde68b492 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 70:c1fbde68b492 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 70:c1fbde68b492 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 70:c1fbde68b492 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 70:c1fbde68b492 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 70:c1fbde68b492 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 70:c1fbde68b492 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 70:c1fbde68b492 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 70:c1fbde68b492 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 70:c1fbde68b492 28 *******************************************************************************
mbed_official 52:a51c77007319 29 */
mbed_official 227:7bd0639b8911 30 #include "mbed_assert.h"
mbed_official 52:a51c77007319 31 #include "spi_api.h"
mbed_official 52:a51c77007319 32
mbed_official 52:a51c77007319 33 #if DEVICE_SPI
mbed_official 52:a51c77007319 34
mbed_official 52:a51c77007319 35 #include <math.h>
mbed_official 52:a51c77007319 36 #include "cmsis.h"
mbed_official 52:a51c77007319 37 #include "pinmap.h"
mbed_official 52:a51c77007319 38
mbed_official 52:a51c77007319 39 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 52:a51c77007319 40 {PA_7, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 139:e3413eddde57 41 {PB_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 1)}, // GPIO_Remap_SPI1
mbed_official 139:e3413eddde57 42 {PB_15, SPI_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 52:a51c77007319 43 {NC, NC, 0}
mbed_official 52:a51c77007319 44 };
mbed_official 52:a51c77007319 45
mbed_official 52:a51c77007319 46 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 52:a51c77007319 47 {PA_6, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 139:e3413eddde57 48 {PB_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 1)}, // GPIO_Remap_SPI1
mbed_official 139:e3413eddde57 49 {PB_14, SPI_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 52:a51c77007319 50 {NC, NC, 0}
mbed_official 52:a51c77007319 51 };
mbed_official 52:a51c77007319 52
mbed_official 52:a51c77007319 53 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 52:a51c77007319 54 {PA_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 139:e3413eddde57 55 {PB_3, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 1)}, // GPIO_Remap_SPI1
mbed_official 139:e3413eddde57 56 {PB_13, SPI_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 52:a51c77007319 57 {NC, NC, 0}
mbed_official 52:a51c77007319 58 };
mbed_official 52:a51c77007319 59
mbed_official 52:a51c77007319 60 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 139:e3413eddde57 61 {PA_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 139:e3413eddde57 62 {PA_15, SPI_1, STM_PIN_DATA(GPIO_Mode_AF_PP, 1)}, // GPIO_Remap_SPI1
mbed_official 139:e3413eddde57 63 {PB_12, SPI_2, STM_PIN_DATA(GPIO_Mode_AF_PP, 0)},
mbed_official 52:a51c77007319 64 {NC, NC, 0}
mbed_official 52:a51c77007319 65 };
mbed_official 52:a51c77007319 66
mbed_official 402:09075a3b15e3 67 static void init_spi(spi_t *obj)
mbed_official 402:09075a3b15e3 68 {
mbed_official 56:99eb381a3269 69 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 56:99eb381a3269 70 SPI_InitTypeDef SPI_InitStructure;
mbed_official 56:99eb381a3269 71
mbed_official 56:99eb381a3269 72 SPI_Cmd(spi, DISABLE);
mbed_official 52:a51c77007319 73
mbed_official 139:e3413eddde57 74 SPI_InitStructure.SPI_Mode = obj->mode;
mbed_official 139:e3413eddde57 75 SPI_InitStructure.SPI_NSS = obj->nss;
mbed_official 174:8bb9f3a33240 76 SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
mbed_official 139:e3413eddde57 77 SPI_InitStructure.SPI_DataSize = obj->bits;
mbed_official 139:e3413eddde57 78 SPI_InitStructure.SPI_CPOL = obj->cpol;
mbed_official 139:e3413eddde57 79 SPI_InitStructure.SPI_CPHA = obj->cpha;
mbed_official 56:99eb381a3269 80 SPI_InitStructure.SPI_BaudRatePrescaler = obj->br_presc;
mbed_official 139:e3413eddde57 81 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
mbed_official 139:e3413eddde57 82 SPI_InitStructure.SPI_CRCPolynomial = 7;
mbed_official 56:99eb381a3269 83 SPI_Init(spi, &SPI_InitStructure);
mbed_official 56:99eb381a3269 84
mbed_official 56:99eb381a3269 85 SPI_Cmd(spi, ENABLE);
mbed_official 56:99eb381a3269 86 }
mbed_official 56:99eb381a3269 87
mbed_official 402:09075a3b15e3 88 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
mbed_official 402:09075a3b15e3 89 {
mbed_official 52:a51c77007319 90 // Determine the SPI to use
mbed_official 52:a51c77007319 91 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 52:a51c77007319 92 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 52:a51c77007319 93 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 52:a51c77007319 94 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 174:8bb9f3a33240 95
mbed_official 52:a51c77007319 96 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 52:a51c77007319 97 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 174:8bb9f3a33240 98
mbed_official 52:a51c77007319 99 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 227:7bd0639b8911 100 MBED_ASSERT(obj->spi != (SPIName)NC);
mbed_official 174:8bb9f3a33240 101
mbed_official 52:a51c77007319 102 // Enable SPI clock
mbed_official 52:a51c77007319 103 if (obj->spi == SPI_1) {
mbed_official 174:8bb9f3a33240 104 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 52:a51c77007319 105 }
mbed_official 139:e3413eddde57 106 if (obj->spi == SPI_2) {
mbed_official 139:e3413eddde57 107 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 139:e3413eddde57 108 }
mbed_official 139:e3413eddde57 109
mbed_official 52:a51c77007319 110 // Configure the SPI pins
mbed_official 52:a51c77007319 111 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 52:a51c77007319 112 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 52:a51c77007319 113 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 174:8bb9f3a33240 114
mbed_official 52:a51c77007319 115 // Save new values
mbed_official 52:a51c77007319 116 obj->bits = SPI_DataSize_8b;
mbed_official 52:a51c77007319 117 obj->cpol = SPI_CPOL_Low;
mbed_official 52:a51c77007319 118 obj->cpha = SPI_CPHA_1Edge;
mbed_official 139:e3413eddde57 119 obj->br_presc = SPI_BaudRatePrescaler_256;
mbed_official 174:8bb9f3a33240 120
mbed_official 208:4557f4bb2dd5 121 obj->pin_miso = miso;
mbed_official 208:4557f4bb2dd5 122 obj->pin_mosi = mosi;
mbed_official 208:4557f4bb2dd5 123 obj->pin_sclk = sclk;
mbed_official 208:4557f4bb2dd5 124 obj->pin_ssel = ssel;
mbed_official 208:4557f4bb2dd5 125
mbed_official 52:a51c77007319 126 if (ssel == NC) { // Master
mbed_official 52:a51c77007319 127 obj->mode = SPI_Mode_Master;
mbed_official 52:a51c77007319 128 obj->nss = SPI_NSS_Soft;
mbed_official 174:8bb9f3a33240 129 } else { // Slave
mbed_official 52:a51c77007319 130 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 52:a51c77007319 131 obj->mode = SPI_Mode_Slave;
mbed_official 181:a4cbdfbbd2f4 132 obj->nss = SPI_NSS_Hard;
mbed_official 52:a51c77007319 133 }
mbed_official 52:a51c77007319 134
mbed_official 56:99eb381a3269 135 init_spi(obj);
mbed_official 52:a51c77007319 136 }
mbed_official 52:a51c77007319 137
mbed_official 402:09075a3b15e3 138 void spi_free(spi_t *obj)
mbed_official 402:09075a3b15e3 139 {
mbed_official 208:4557f4bb2dd5 140 // Reset SPI and disable clock
mbed_official 208:4557f4bb2dd5 141 if (obj->spi == SPI_1) {
mbed_official 208:4557f4bb2dd5 142 RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 208:4557f4bb2dd5 143 RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, DISABLE);
mbed_official 208:4557f4bb2dd5 144 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, DISABLE);
mbed_official 208:4557f4bb2dd5 145 }
mbed_official 208:4557f4bb2dd5 146
mbed_official 208:4557f4bb2dd5 147 if (obj->spi == SPI_2) {
mbed_official 208:4557f4bb2dd5 148 RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 208:4557f4bb2dd5 149 RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, DISABLE);
mbed_official 208:4557f4bb2dd5 150 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, DISABLE);
mbed_official 208:4557f4bb2dd5 151 }
mbed_official 208:4557f4bb2dd5 152
mbed_official 208:4557f4bb2dd5 153 // Configure GPIOs
mbed_official 208:4557f4bb2dd5 154 pin_function(obj->pin_miso, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0));
mbed_official 208:4557f4bb2dd5 155 pin_function(obj->pin_mosi, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0));
mbed_official 208:4557f4bb2dd5 156 pin_function(obj->pin_sclk, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0));
mbed_official 208:4557f4bb2dd5 157 pin_function(obj->pin_ssel, STM_PIN_DATA(GPIO_Mode_IN_FLOATING, 0));
mbed_official 52:a51c77007319 158 }
mbed_official 52:a51c77007319 159
mbed_official 402:09075a3b15e3 160 void spi_format(spi_t *obj, int bits, int mode, int slave)
mbed_official 402:09075a3b15e3 161 {
mbed_official 52:a51c77007319 162 // Save new values
mbed_official 233:1bbc1451db33 163 if (bits == 16) {
mbed_official 233:1bbc1451db33 164 obj->bits = SPI_DataSize_16b;
mbed_official 233:1bbc1451db33 165 } else {
mbed_official 52:a51c77007319 166 obj->bits = SPI_DataSize_8b;
mbed_official 52:a51c77007319 167 }
mbed_official 174:8bb9f3a33240 168
mbed_official 52:a51c77007319 169 switch (mode) {
mbed_official 52:a51c77007319 170 case 0:
mbed_official 174:8bb9f3a33240 171 obj->cpol = SPI_CPOL_Low;
mbed_official 174:8bb9f3a33240 172 obj->cpha = SPI_CPHA_1Edge;
mbed_official 174:8bb9f3a33240 173 break;
mbed_official 52:a51c77007319 174 case 1:
mbed_official 174:8bb9f3a33240 175 obj->cpol = SPI_CPOL_Low;
mbed_official 174:8bb9f3a33240 176 obj->cpha = SPI_CPHA_2Edge;
mbed_official 174:8bb9f3a33240 177 break;
mbed_official 52:a51c77007319 178 case 2:
mbed_official 174:8bb9f3a33240 179 obj->cpol = SPI_CPOL_High;
mbed_official 174:8bb9f3a33240 180 obj->cpha = SPI_CPHA_1Edge;
mbed_official 174:8bb9f3a33240 181 break;
mbed_official 52:a51c77007319 182 default:
mbed_official 174:8bb9f3a33240 183 obj->cpol = SPI_CPOL_High;
mbed_official 174:8bb9f3a33240 184 obj->cpha = SPI_CPHA_2Edge;
mbed_official 174:8bb9f3a33240 185 break;
mbed_official 52:a51c77007319 186 }
mbed_official 174:8bb9f3a33240 187
mbed_official 52:a51c77007319 188 if (slave == 0) {
mbed_official 52:a51c77007319 189 obj->mode = SPI_Mode_Master;
mbed_official 52:a51c77007319 190 obj->nss = SPI_NSS_Soft;
mbed_official 174:8bb9f3a33240 191 } else {
mbed_official 52:a51c77007319 192 obj->mode = SPI_Mode_Slave;
mbed_official 174:8bb9f3a33240 193 obj->nss = SPI_NSS_Hard;
mbed_official 52:a51c77007319 194 }
mbed_official 174:8bb9f3a33240 195
mbed_official 56:99eb381a3269 196 init_spi(obj);
mbed_official 52:a51c77007319 197 }
mbed_official 52:a51c77007319 198
mbed_official 402:09075a3b15e3 199 void spi_frequency(spi_t *obj, int hz)
mbed_official 402:09075a3b15e3 200 {
mbed_official 139:e3413eddde57 201 if (obj->spi == SPI_1) {
mbed_official 139:e3413eddde57 202 // Values depend of PCLK2: 64 MHz if HSI is used, 72 MHz if HSE is used
mbed_official 139:e3413eddde57 203 if (hz < 500000) {
mbed_official 139:e3413eddde57 204 obj->br_presc = SPI_BaudRatePrescaler_256; // 250 kHz - 281 kHz
mbed_official 174:8bb9f3a33240 205 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 206 obj->br_presc = SPI_BaudRatePrescaler_128; // 500 kHz - 563 kHz
mbed_official 174:8bb9f3a33240 207 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 139:e3413eddde57 208 obj->br_presc = SPI_BaudRatePrescaler_64; // 1 MHz - 1.13 MHz
mbed_official 174:8bb9f3a33240 209 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 139:e3413eddde57 210 obj->br_presc = SPI_BaudRatePrescaler_32; // 2 MHz - 2.25 MHz
mbed_official 174:8bb9f3a33240 211 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 139:e3413eddde57 212 obj->br_presc = SPI_BaudRatePrescaler_16; // 4 MHz - 4.5 MHz
mbed_official 174:8bb9f3a33240 213 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 139:e3413eddde57 214 obj->br_presc = SPI_BaudRatePrescaler_8; // 8 MHz - 9 MHz
mbed_official 174:8bb9f3a33240 215 } else if ((hz >= 16000000) && (hz < 32000000)) {
mbed_official 139:e3413eddde57 216 obj->br_presc = SPI_BaudRatePrescaler_4; // 16 MHz - 18 MHz
mbed_official 174:8bb9f3a33240 217 } else { // >= 32000000
mbed_official 139:e3413eddde57 218 obj->br_presc = SPI_BaudRatePrescaler_2; // 32 MHz - 36 MHz
mbed_official 139:e3413eddde57 219 }
mbed_official 139:e3413eddde57 220 }
mbed_official 174:8bb9f3a33240 221
mbed_official 139:e3413eddde57 222 if (obj->spi == SPI_2) {
mbed_official 139:e3413eddde57 223 // Values depend of PCLK1: 32 MHz if HSI is used, 36 MHz if HSE is used
mbed_official 139:e3413eddde57 224 if (hz < 250000) {
mbed_official 139:e3413eddde57 225 obj->br_presc = SPI_BaudRatePrescaler_256; // 125 kHz - 141 kHz
mbed_official 174:8bb9f3a33240 226 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 139:e3413eddde57 227 obj->br_presc = SPI_BaudRatePrescaler_128; // 250 kHz - 281 kHz
mbed_official 174:8bb9f3a33240 228 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 229 obj->br_presc = SPI_BaudRatePrescaler_64; // 500 kHz - 563 kHz
mbed_official 174:8bb9f3a33240 230 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 139:e3413eddde57 231 obj->br_presc = SPI_BaudRatePrescaler_32; // 1 MHz - 1.13 MHz
mbed_official 174:8bb9f3a33240 232 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 139:e3413eddde57 233 obj->br_presc = SPI_BaudRatePrescaler_16; // 2 MHz - 2.25 MHz
mbed_official 174:8bb9f3a33240 234 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 139:e3413eddde57 235 obj->br_presc = SPI_BaudRatePrescaler_8; // 4 MHz - 4.5 MHz
mbed_official 174:8bb9f3a33240 236 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 139:e3413eddde57 237 obj->br_presc = SPI_BaudRatePrescaler_4; // 8 MHz - 9 MHz
mbed_official 174:8bb9f3a33240 238 } else { // >= 16000000
mbed_official 139:e3413eddde57 239 obj->br_presc = SPI_BaudRatePrescaler_2; // 16 MHz - 18 MHz
mbed_official 139:e3413eddde57 240 }
mbed_official 139:e3413eddde57 241 }
mbed_official 52:a51c77007319 242
mbed_official 56:99eb381a3269 243 init_spi(obj);
mbed_official 52:a51c77007319 244 }
mbed_official 52:a51c77007319 245
mbed_official 402:09075a3b15e3 246 static inline int ssp_readable(spi_t *obj)
mbed_official 402:09075a3b15e3 247 {
mbed_official 52:a51c77007319 248 int status;
mbed_official 52:a51c77007319 249 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 250 // Check if data is received
mbed_official 52:a51c77007319 251 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 174:8bb9f3a33240 252 return status;
mbed_official 52:a51c77007319 253 }
mbed_official 52:a51c77007319 254
mbed_official 402:09075a3b15e3 255 static inline int ssp_writeable(spi_t *obj)
mbed_official 402:09075a3b15e3 256 {
mbed_official 52:a51c77007319 257 int status;
mbed_official 52:a51c77007319 258 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 259 // Check if data is transmitted
mbed_official 52:a51c77007319 260 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 52:a51c77007319 261 return status;
mbed_official 52:a51c77007319 262 }
mbed_official 52:a51c77007319 263
mbed_official 402:09075a3b15e3 264 static inline void ssp_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 265 {
mbed_official 174:8bb9f3a33240 266 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 267 while (!ssp_writeable(obj));
mbed_official 52:a51c77007319 268 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 52:a51c77007319 269 }
mbed_official 52:a51c77007319 270
mbed_official 402:09075a3b15e3 271 static inline int ssp_read(spi_t *obj)
mbed_official 402:09075a3b15e3 272 {
mbed_official 174:8bb9f3a33240 273 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 274 while (!ssp_readable(obj));
mbed_official 52:a51c77007319 275 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 52:a51c77007319 276 }
mbed_official 52:a51c77007319 277
mbed_official 402:09075a3b15e3 278 static inline int ssp_busy(spi_t *obj)
mbed_official 402:09075a3b15e3 279 {
mbed_official 52:a51c77007319 280 int status;
mbed_official 52:a51c77007319 281 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 282 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 52:a51c77007319 283 return status;
mbed_official 52:a51c77007319 284 }
mbed_official 52:a51c77007319 285
mbed_official 402:09075a3b15e3 286 int spi_master_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 287 {
mbed_official 52:a51c77007319 288 ssp_write(obj, value);
mbed_official 52:a51c77007319 289 return ssp_read(obj);
mbed_official 52:a51c77007319 290 }
mbed_official 52:a51c77007319 291
mbed_official 402:09075a3b15e3 292 int spi_slave_receive(spi_t *obj)
mbed_official 402:09075a3b15e3 293 {
mbed_official 233:1bbc1451db33 294 return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
mbed_official 52:a51c77007319 295 };
mbed_official 52:a51c77007319 296
mbed_official 402:09075a3b15e3 297 int spi_slave_read(spi_t *obj)
mbed_official 402:09075a3b15e3 298 {
mbed_official 52:a51c77007319 299 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 52:a51c77007319 300 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 52:a51c77007319 301 }
mbed_official 52:a51c77007319 302
mbed_official 402:09075a3b15e3 303 void spi_slave_write(spi_t *obj, int value)
mbed_official 402:09075a3b15e3 304 {
mbed_official 174:8bb9f3a33240 305 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 174:8bb9f3a33240 306 while (!ssp_writeable(obj));
mbed_official 52:a51c77007319 307 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 52:a51c77007319 308 }
mbed_official 52:a51c77007319 309
mbed_official 402:09075a3b15e3 310 int spi_busy(spi_t *obj)
mbed_official 402:09075a3b15e3 311 {
mbed_official 52:a51c77007319 312 return ssp_busy(obj);
mbed_official 52:a51c77007319 313 }
mbed_official 52:a51c77007319 314
mbed_official 52:a51c77007319 315 #endif