shao ziyang / mbed-src-kl05

mbed library sources

Dependents:   frdm_kl05z_gpio_test

Fork of mbed-src by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_L152RE/spi_api.c@215:83cf97a28428, 2014-05-27 (annotated)

Committer:
mbed_official
Date:
Tue May 27 08:30:06 2014 +0100
Revision:
215:83cf97a28428
Parent:
190:bde2479eef9e
Child:
227:7bd0639b8911
Synchronized with git revision a8b7f5df2cb5d7a76fda549a15b91fdaba6e2986



Full URL: https://github.com/mbedmicro/mbed/commit/a8b7f5df2cb5d7a76fda549a15b91fdaba6e2986/



[KLXX] Added RPC + RTOS support (KL05Z)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 76:aeb1df146756 1 /* mbed Microcontroller Library
mbed_official 76:aeb1df146756 2 *******************************************************************************
mbed_official 76:aeb1df146756 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 76:aeb1df146756 4 * All rights reserved.
mbed_official 76:aeb1df146756 5 *
mbed_official 76:aeb1df146756 6 * Redistribution and use in source and binary forms, with or without
mbed_official 76:aeb1df146756 7 * modification, are permitted provided that the following conditions are met:
mbed_official 76:aeb1df146756 8 *
mbed_official 76:aeb1df146756 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 76:aeb1df146756 10 * this list of conditions and the following disclaimer.
mbed_official 76:aeb1df146756 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 76:aeb1df146756 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 76:aeb1df146756 13 * and/or other materials provided with the distribution.
mbed_official 76:aeb1df146756 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 76:aeb1df146756 15 * may be used to endorse or promote products derived from this software
mbed_official 76:aeb1df146756 16 * without specific prior written permission.
mbed_official 76:aeb1df146756 17 *
mbed_official 76:aeb1df146756 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 76:aeb1df146756 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 76:aeb1df146756 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 76:aeb1df146756 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 76:aeb1df146756 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 76:aeb1df146756 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 76:aeb1df146756 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 76:aeb1df146756 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 76:aeb1df146756 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 76:aeb1df146756 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 76:aeb1df146756 28 *******************************************************************************
mbed_official 76:aeb1df146756 29 */
mbed_official 76:aeb1df146756 30 #include "spi_api.h"
mbed_official 76:aeb1df146756 31
mbed_official 76:aeb1df146756 32 #if DEVICE_SPI
mbed_official 76:aeb1df146756 33
mbed_official 76:aeb1df146756 34 #include <math.h>
mbed_official 76:aeb1df146756 35 #include "cmsis.h"
mbed_official 76:aeb1df146756 36 #include "pinmap.h"
mbed_official 76:aeb1df146756 37 #include "error.h"
mbed_official 76:aeb1df146756 38
mbed_official 76:aeb1df146756 39 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 174:8bb9f3a33240 40 {PA_7, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 41 {PA_12, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 42 {PB_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 174:8bb9f3a33240 43 // {PB_5, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 129:0182c99221bc 44 {PB_15, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 129:0182c99221bc 45 {PC_12, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 76:aeb1df146756 46 {NC, NC, 0}
mbed_official 76:aeb1df146756 47 };
mbed_official 76:aeb1df146756 48
mbed_official 76:aeb1df146756 49 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 174:8bb9f3a33240 50 {PA_6, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 51 {PA_11, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 52 {PB_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 174:8bb9f3a33240 53 // {PB_4, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 118:b44c45162f28 54 {PB_14, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 118:b44c45162f28 55 {PC_11, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 76:aeb1df146756 56 {NC, NC, 0}
mbed_official 76:aeb1df146756 57 };
mbed_official 76:aeb1df146756 58
mbed_official 76:aeb1df146756 59 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 174:8bb9f3a33240 60 {PA_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 129:0182c99221bc 61 {PB_3, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 174:8bb9f3a33240 62 // {PB_3, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 118:b44c45162f28 63 {PB_13, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 118:b44c45162f28 64 {PC_10, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 76:aeb1df146756 65 {NC, NC, 0}
mbed_official 76:aeb1df146756 66 };
mbed_official 76:aeb1df146756 67
mbed_official 76:aeb1df146756 68 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 129:0182c99221bc 69 {PA_4, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 174:8bb9f3a33240 70 // {PA_4, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 129:0182c99221bc 71 {PA_15, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI1)},
mbed_official 174:8bb9f3a33240 72 // {PA_15, SPI_3, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI3)},
mbed_official 118:b44c45162f28 73 {PB_12, SPI_2, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_UP, GPIO_AF_SPI2)},
mbed_official 76:aeb1df146756 74 {NC, NC, 0}
mbed_official 76:aeb1df146756 75 };
mbed_official 76:aeb1df146756 76
mbed_official 76:aeb1df146756 77 static void init_spi(spi_t *obj) {
mbed_official 76:aeb1df146756 78 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 79 SPI_InitTypeDef SPI_InitStructure;
mbed_official 76:aeb1df146756 80
mbed_official 76:aeb1df146756 81 SPI_Cmd(spi, DISABLE);
mbed_official 76:aeb1df146756 82
mbed_official 129:0182c99221bc 83 SPI_InitStructure.SPI_Mode = obj->mode;
mbed_official 174:8bb9f3a33240 84 SPI_InitStructure.SPI_NSS = obj->nss;
mbed_official 174:8bb9f3a33240 85 SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
mbed_official 129:0182c99221bc 86 SPI_InitStructure.SPI_DataSize = obj->bits;
mbed_official 129:0182c99221bc 87 SPI_InitStructure.SPI_CPOL = obj->cpol;
mbed_official 174:8bb9f3a33240 88 SPI_InitStructure.SPI_CPHA = obj->cpha;
mbed_official 76:aeb1df146756 89 SPI_InitStructure.SPI_BaudRatePrescaler = obj->br_presc;
mbed_official 129:0182c99221bc 90 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
mbed_official 129:0182c99221bc 91 SPI_InitStructure.SPI_CRCPolynomial = 7;
mbed_official 76:aeb1df146756 92 SPI_Init(spi, &SPI_InitStructure);
mbed_official 76:aeb1df146756 93
mbed_official 76:aeb1df146756 94 SPI_Cmd(spi, ENABLE);
mbed_official 76:aeb1df146756 95 }
mbed_official 76:aeb1df146756 96
mbed_official 76:aeb1df146756 97 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 76:aeb1df146756 98 // Determine the SPI to use
mbed_official 76:aeb1df146756 99 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 76:aeb1df146756 100 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 76:aeb1df146756 101 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 76:aeb1df146756 102 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 174:8bb9f3a33240 103
mbed_official 76:aeb1df146756 104 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 76:aeb1df146756 105 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 174:8bb9f3a33240 106
mbed_official 76:aeb1df146756 107 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 174:8bb9f3a33240 108
mbed_official 76:aeb1df146756 109 if (obj->spi == (SPIName)NC) {
mbed_official 76:aeb1df146756 110 error("SPI pinout mapping failed");
mbed_official 76:aeb1df146756 111 }
mbed_official 174:8bb9f3a33240 112
mbed_official 76:aeb1df146756 113 // Enable SPI clock
mbed_official 76:aeb1df146756 114 if (obj->spi == SPI_1) {
mbed_official 174:8bb9f3a33240 115 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 76:aeb1df146756 116 }
mbed_official 76:aeb1df146756 117 if (obj->spi == SPI_2) {
mbed_official 174:8bb9f3a33240 118 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 76:aeb1df146756 119 }
mbed_official 118:b44c45162f28 120 if (obj->spi == SPI_3) {
mbed_official 174:8bb9f3a33240 121 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
mbed_official 118:b44c45162f28 122 }
mbed_official 174:8bb9f3a33240 123
mbed_official 76:aeb1df146756 124 // Configure the SPI pins
mbed_official 76:aeb1df146756 125 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 76:aeb1df146756 126 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 76:aeb1df146756 127 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 174:8bb9f3a33240 128
mbed_official 76:aeb1df146756 129 // Save new values
mbed_official 76:aeb1df146756 130 obj->bits = SPI_DataSize_8b;
mbed_official 76:aeb1df146756 131 obj->cpol = SPI_CPOL_Low;
mbed_official 76:aeb1df146756 132 obj->cpha = SPI_CPHA_1Edge;
mbed_official 129:0182c99221bc 133 obj->br_presc = SPI_BaudRatePrescaler_256;
mbed_official 174:8bb9f3a33240 134
mbed_official 215:83cf97a28428 135 obj->pin_miso = miso;
mbed_official 215:83cf97a28428 136 obj->pin_mosi = mosi;
mbed_official 215:83cf97a28428 137 obj->pin_sclk = sclk;
mbed_official 215:83cf97a28428 138 obj->pin_ssel = ssel;
mbed_official 215:83cf97a28428 139
mbed_official 76:aeb1df146756 140 if (ssel == NC) { // Master
mbed_official 76:aeb1df146756 141 obj->mode = SPI_Mode_Master;
mbed_official 76:aeb1df146756 142 obj->nss = SPI_NSS_Soft;
mbed_official 174:8bb9f3a33240 143 } else { // Slave
mbed_official 76:aeb1df146756 144 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 76:aeb1df146756 145 obj->mode = SPI_Mode_Slave;
mbed_official 190:bde2479eef9e 146 obj->nss = SPI_NSS_Hard;
mbed_official 76:aeb1df146756 147 }
mbed_official 76:aeb1df146756 148
mbed_official 76:aeb1df146756 149 init_spi(obj);
mbed_official 76:aeb1df146756 150 }
mbed_official 76:aeb1df146756 151
mbed_official 76:aeb1df146756 152 void spi_free(spi_t *obj) {
mbed_official 215:83cf97a28428 153 // Reset SPI and disable clock
mbed_official 215:83cf97a28428 154 if (obj->spi == SPI_1) {
mbed_official 215:83cf97a28428 155 RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 215:83cf97a28428 156 RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, DISABLE);
mbed_official 215:83cf97a28428 157 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, DISABLE);
mbed_official 215:83cf97a28428 158 }
mbed_official 215:83cf97a28428 159
mbed_official 215:83cf97a28428 160 if (obj->spi == SPI_2) {
mbed_official 215:83cf97a28428 161 RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 215:83cf97a28428 162 RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, DISABLE);
mbed_official 215:83cf97a28428 163 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, DISABLE);
mbed_official 215:83cf97a28428 164 }
mbed_official 215:83cf97a28428 165
mbed_official 215:83cf97a28428 166 if (obj->spi == SPI_3) {
mbed_official 215:83cf97a28428 167 RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, ENABLE);
mbed_official 215:83cf97a28428 168 RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI3, DISABLE);
mbed_official 215:83cf97a28428 169 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, DISABLE);
mbed_official 215:83cf97a28428 170 }
mbed_official 215:83cf97a28428 171
mbed_official 215:83cf97a28428 172 // Configure GPIOs
mbed_official 215:83cf97a28428 173 pin_function(obj->pin_miso, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF));
mbed_official 215:83cf97a28428 174 pin_function(obj->pin_mosi, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF));
mbed_official 215:83cf97a28428 175 pin_function(obj->pin_sclk, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF));
mbed_official 215:83cf97a28428 176 pin_function(obj->pin_ssel, STM_PIN_DATA(GPIO_Mode_IN, 0, GPIO_PuPd_NOPULL, 0xFF));
mbed_official 76:aeb1df146756 177 }
mbed_official 76:aeb1df146756 178
mbed_official 174:8bb9f3a33240 179 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 76:aeb1df146756 180 // Save new values
mbed_official 76:aeb1df146756 181 if (bits == 8) {
mbed_official 76:aeb1df146756 182 obj->bits = SPI_DataSize_8b;
mbed_official 174:8bb9f3a33240 183 } else {
mbed_official 76:aeb1df146756 184 obj->bits = SPI_DataSize_16b;
mbed_official 76:aeb1df146756 185 }
mbed_official 174:8bb9f3a33240 186
mbed_official 76:aeb1df146756 187 switch (mode) {
mbed_official 76:aeb1df146756 188 case 0:
mbed_official 174:8bb9f3a33240 189 obj->cpol = SPI_CPOL_Low;
mbed_official 174:8bb9f3a33240 190 obj->cpha = SPI_CPHA_1Edge;
mbed_official 174:8bb9f3a33240 191 break;
mbed_official 76:aeb1df146756 192 case 1:
mbed_official 174:8bb9f3a33240 193 obj->cpol = SPI_CPOL_Low;
mbed_official 174:8bb9f3a33240 194 obj->cpha = SPI_CPHA_2Edge;
mbed_official 174:8bb9f3a33240 195 break;
mbed_official 76:aeb1df146756 196 case 2:
mbed_official 174:8bb9f3a33240 197 obj->cpol = SPI_CPOL_High;
mbed_official 174:8bb9f3a33240 198 obj->cpha = SPI_CPHA_1Edge;
mbed_official 174:8bb9f3a33240 199 break;
mbed_official 76:aeb1df146756 200 default:
mbed_official 174:8bb9f3a33240 201 obj->cpol = SPI_CPOL_High;
mbed_official 174:8bb9f3a33240 202 obj->cpha = SPI_CPHA_2Edge;
mbed_official 174:8bb9f3a33240 203 break;
mbed_official 76:aeb1df146756 204 }
mbed_official 174:8bb9f3a33240 205
mbed_official 76:aeb1df146756 206 if (slave == 0) {
mbed_official 76:aeb1df146756 207 obj->mode = SPI_Mode_Master;
mbed_official 76:aeb1df146756 208 obj->nss = SPI_NSS_Soft;
mbed_official 174:8bb9f3a33240 209 } else {
mbed_official 76:aeb1df146756 210 obj->mode = SPI_Mode_Slave;
mbed_official 174:8bb9f3a33240 211 obj->nss = SPI_NSS_Hard;
mbed_official 76:aeb1df146756 212 }
mbed_official 174:8bb9f3a33240 213
mbed_official 76:aeb1df146756 214 init_spi(obj);
mbed_official 76:aeb1df146756 215 }
mbed_official 76:aeb1df146756 216
mbed_official 76:aeb1df146756 217 void spi_frequency(spi_t *obj, int hz) {
mbed_official 139:e3413eddde57 218 // Values depend of PCLK1 and PCLK2: 32 MHz if HSI is used, 24 MHz if HSE is used
mbed_official 139:e3413eddde57 219 if (SystemCoreClock == 32000000) { // HSI
mbed_official 139:e3413eddde57 220 if (hz < 250000) {
mbed_official 139:e3413eddde57 221 obj->br_presc = SPI_BaudRatePrescaler_256; // 125 kHz
mbed_official 174:8bb9f3a33240 222 } else if ((hz >= 250000) && (hz < 500000)) {
mbed_official 139:e3413eddde57 223 obj->br_presc = SPI_BaudRatePrescaler_128; // 250 kHz
mbed_official 174:8bb9f3a33240 224 } else if ((hz >= 500000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 225 obj->br_presc = SPI_BaudRatePrescaler_64; // 500 kHz
mbed_official 174:8bb9f3a33240 226 } else if ((hz >= 1000000) && (hz < 2000000)) {
mbed_official 139:e3413eddde57 227 obj->br_presc = SPI_BaudRatePrescaler_32; // 1 MHz
mbed_official 174:8bb9f3a33240 228 } else if ((hz >= 2000000) && (hz < 4000000)) {
mbed_official 139:e3413eddde57 229 obj->br_presc = SPI_BaudRatePrescaler_16; // 2 MHz
mbed_official 174:8bb9f3a33240 230 } else if ((hz >= 4000000) && (hz < 8000000)) {
mbed_official 139:e3413eddde57 231 obj->br_presc = SPI_BaudRatePrescaler_8; // 4 MHz
mbed_official 174:8bb9f3a33240 232 } else if ((hz >= 8000000) && (hz < 16000000)) {
mbed_official 139:e3413eddde57 233 obj->br_presc = SPI_BaudRatePrescaler_4; // 8 MHz
mbed_official 174:8bb9f3a33240 234 } else { // >= 16000000
mbed_official 139:e3413eddde57 235 obj->br_presc = SPI_BaudRatePrescaler_2; // 16 MHz
mbed_official 139:e3413eddde57 236 }
mbed_official 174:8bb9f3a33240 237 } else { // 24 MHz - HSE
mbed_official 139:e3413eddde57 238 if (hz < 180000) {
mbed_official 139:e3413eddde57 239 obj->br_presc = SPI_BaudRatePrescaler_256; // 94 kHz
mbed_official 174:8bb9f3a33240 240 } else if ((hz >= 180000) && (hz < 350000)) {
mbed_official 139:e3413eddde57 241 obj->br_presc = SPI_BaudRatePrescaler_128; // 188 kHz
mbed_official 174:8bb9f3a33240 242 } else if ((hz >= 350000) && (hz < 750000)) {
mbed_official 139:e3413eddde57 243 obj->br_presc = SPI_BaudRatePrescaler_64; // 375 kHz
mbed_official 174:8bb9f3a33240 244 } else if ((hz >= 750000) && (hz < 1000000)) {
mbed_official 139:e3413eddde57 245 obj->br_presc = SPI_BaudRatePrescaler_32; // 750 kHz
mbed_official 174:8bb9f3a33240 246 } else if ((hz >= 1000000) && (hz < 3000000)) {
mbed_official 174:8bb9f3a33240 247 obj->br_presc = SPI_BaudRatePrescaler_16; // 1.5 MHz
mbed_official 174:8bb9f3a33240 248 } else if ((hz >= 3000000) && (hz < 6000000)) {
mbed_official 174:8bb9f3a33240 249 obj->br_presc = SPI_BaudRatePrescaler_8; // 3 MHz
mbed_official 174:8bb9f3a33240 250 } else if ((hz >= 6000000) && (hz < 12000000)) {
mbed_official 174:8bb9f3a33240 251 obj->br_presc = SPI_BaudRatePrescaler_4; // 6 MHz
mbed_official 174:8bb9f3a33240 252 } else { // >= 12000000
mbed_official 174:8bb9f3a33240 253 obj->br_presc = SPI_BaudRatePrescaler_2; // 12 MHz
mbed_official 139:e3413eddde57 254 }
mbed_official 129:0182c99221bc 255 }
mbed_official 76:aeb1df146756 256 init_spi(obj);
mbed_official 76:aeb1df146756 257 }
mbed_official 76:aeb1df146756 258
mbed_official 76:aeb1df146756 259 static inline int ssp_readable(spi_t *obj) {
mbed_official 76:aeb1df146756 260 int status;
mbed_official 76:aeb1df146756 261 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 262 // Check if data is received
mbed_official 76:aeb1df146756 263 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 174:8bb9f3a33240 264 return status;
mbed_official 76:aeb1df146756 265 }
mbed_official 76:aeb1df146756 266
mbed_official 76:aeb1df146756 267 static inline int ssp_writeable(spi_t *obj) {
mbed_official 76:aeb1df146756 268 int status;
mbed_official 76:aeb1df146756 269 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 270 // Check if data is transmitted
mbed_official 76:aeb1df146756 271 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 272 return status;
mbed_official 76:aeb1df146756 273 }
mbed_official 76:aeb1df146756 274
mbed_official 76:aeb1df146756 275 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 174:8bb9f3a33240 276 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 277 while (!ssp_writeable(obj));
mbed_official 76:aeb1df146756 278 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 76:aeb1df146756 279 }
mbed_official 76:aeb1df146756 280
mbed_official 76:aeb1df146756 281 static inline int ssp_read(spi_t *obj) {
mbed_official 174:8bb9f3a33240 282 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 283 while (!ssp_readable(obj));
mbed_official 76:aeb1df146756 284 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 76:aeb1df146756 285 }
mbed_official 76:aeb1df146756 286
mbed_official 76:aeb1df146756 287 static inline int ssp_busy(spi_t *obj) {
mbed_official 76:aeb1df146756 288 int status;
mbed_official 76:aeb1df146756 289 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 290 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 76:aeb1df146756 291 return status;
mbed_official 76:aeb1df146756 292 }
mbed_official 76:aeb1df146756 293
mbed_official 76:aeb1df146756 294 int spi_master_write(spi_t *obj, int value) {
mbed_official 76:aeb1df146756 295 ssp_write(obj, value);
mbed_official 76:aeb1df146756 296 return ssp_read(obj);
mbed_official 76:aeb1df146756 297 }
mbed_official 76:aeb1df146756 298
mbed_official 76:aeb1df146756 299 int spi_slave_receive(spi_t *obj) {
mbed_official 190:bde2479eef9e 300 //return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0); // initial code
mbed_official 190:bde2479eef9e 301 return (ssp_readable(obj)) ? (1) : (0); // works better like this
mbed_official 76:aeb1df146756 302 };
mbed_official 76:aeb1df146756 303
mbed_official 76:aeb1df146756 304 int spi_slave_read(spi_t *obj) {
mbed_official 76:aeb1df146756 305 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 76:aeb1df146756 306 return (int)SPI_I2S_ReceiveData(spi);
mbed_official 76:aeb1df146756 307 }
mbed_official 76:aeb1df146756 308
mbed_official 76:aeb1df146756 309 void spi_slave_write(spi_t *obj, int value) {
mbed_official 174:8bb9f3a33240 310 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 174:8bb9f3a33240 311 while (!ssp_writeable(obj));
mbed_official 76:aeb1df146756 312 SPI_I2S_SendData(spi, (uint16_t)value);
mbed_official 76:aeb1df146756 313 }
mbed_official 76:aeb1df146756 314
mbed_official 76:aeb1df146756 315 int spi_busy(spi_t *obj) {
mbed_official 76:aeb1df146756 316 return ssp_busy(obj);
mbed_official 76:aeb1df146756 317 }
mbed_official 76:aeb1df146756 318
mbed_official 76:aeb1df146756 319 #endif