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Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_STM/TARGET_NUCLEO_F030R8/spi_api.c@84:f54042cbc282, 2014-02-03 (annotated)

Committer:
mbed_official
Date:
Mon Feb 03 09:30:05 2014 +0000
Revision:
84:f54042cbc282
Synchronized with git revision bbbd8699601c42149ccf0c37bc42bb6856ccc4c6



Full URL: https://github.com/mbedmicro/mbed/commit/bbbd8699601c42149ccf0c37bc42bb6856ccc4c6/



[NUCLEO_L152RE/F030_R8] SPI, I2C, Ticker, PWM updates

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 84:f54042cbc282 1 /* mbed Microcontroller Library
mbed_official 84:f54042cbc282 2 *******************************************************************************
mbed_official 84:f54042cbc282 3 * Copyright (c) 2014, STMicroelectronics
mbed_official 84:f54042cbc282 4 * All rights reserved.
mbed_official 84:f54042cbc282 5 *
mbed_official 84:f54042cbc282 6 * Redistribution and use in source and binary forms, with or without
mbed_official 84:f54042cbc282 7 * modification, are permitted provided that the following conditions are met:
mbed_official 84:f54042cbc282 8 *
mbed_official 84:f54042cbc282 9 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 84:f54042cbc282 10 * this list of conditions and the following disclaimer.
mbed_official 84:f54042cbc282 11 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 84:f54042cbc282 12 * this list of conditions and the following disclaimer in the documentation
mbed_official 84:f54042cbc282 13 * and/or other materials provided with the distribution.
mbed_official 84:f54042cbc282 14 * 3. Neither the name of STMicroelectronics nor the names of its contributors
mbed_official 84:f54042cbc282 15 * may be used to endorse or promote products derived from this software
mbed_official 84:f54042cbc282 16 * without specific prior written permission.
mbed_official 84:f54042cbc282 17 *
mbed_official 84:f54042cbc282 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 84:f54042cbc282 19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 84:f54042cbc282 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 84:f54042cbc282 21 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 84:f54042cbc282 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 84:f54042cbc282 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 84:f54042cbc282 24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 84:f54042cbc282 25 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 84:f54042cbc282 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 84:f54042cbc282 27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 84:f54042cbc282 28 *******************************************************************************
mbed_official 84:f54042cbc282 29 */
mbed_official 84:f54042cbc282 30 #include "spi_api.h"
mbed_official 84:f54042cbc282 31
mbed_official 84:f54042cbc282 32 #if DEVICE_SPI
mbed_official 84:f54042cbc282 33
mbed_official 84:f54042cbc282 34 #include <math.h>
mbed_official 84:f54042cbc282 35 #include "cmsis.h"
mbed_official 84:f54042cbc282 36 #include "pinmap.h"
mbed_official 84:f54042cbc282 37 #include "error.h"
mbed_official 84:f54042cbc282 38
mbed_official 84:f54042cbc282 39 static const PinMap PinMap_SPI_MOSI[] = {
mbed_official 84:f54042cbc282 40 {PA_7, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_0)},
mbed_official 84:f54042cbc282 41 {NC, NC, 0}
mbed_official 84:f54042cbc282 42 };
mbed_official 84:f54042cbc282 43
mbed_official 84:f54042cbc282 44 static const PinMap PinMap_SPI_MISO[] = {
mbed_official 84:f54042cbc282 45 {PA_6, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_0)},
mbed_official 84:f54042cbc282 46 {NC, NC, 0}
mbed_official 84:f54042cbc282 47 };
mbed_official 84:f54042cbc282 48
mbed_official 84:f54042cbc282 49 static const PinMap PinMap_SPI_SCLK[] = {
mbed_official 84:f54042cbc282 50 {PA_5, SPI_1, STM_PIN_DATA(GPIO_Mode_AF, GPIO_OType_PP, GPIO_PuPd_NOPULL, GPIO_AF_0)},
mbed_official 84:f54042cbc282 51 {NC, NC, 0}
mbed_official 84:f54042cbc282 52 };
mbed_official 84:f54042cbc282 53
mbed_official 84:f54042cbc282 54 // Only used in Slave mode
mbed_official 84:f54042cbc282 55 static const PinMap PinMap_SPI_SSEL[] = {
mbed_official 84:f54042cbc282 56 {PB_6, SPI_1, STM_PIN_DATA(GPIO_Mode_IN, GPIO_OType_PP, GPIO_PuPd_NOPULL, 0)}, // Generic IO, not real H/W NSS pin
mbed_official 84:f54042cbc282 57 {NC, NC, 0}
mbed_official 84:f54042cbc282 58 };
mbed_official 84:f54042cbc282 59
mbed_official 84:f54042cbc282 60 static void init_spi(spi_t *obj) {
mbed_official 84:f54042cbc282 61 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 84:f54042cbc282 62 SPI_InitTypeDef SPI_InitStructure;
mbed_official 84:f54042cbc282 63
mbed_official 84:f54042cbc282 64 SPI_Cmd(spi, DISABLE);
mbed_official 84:f54042cbc282 65
mbed_official 84:f54042cbc282 66 SPI_InitStructure.SPI_Mode = obj->mode;
mbed_official 84:f54042cbc282 67 SPI_InitStructure.SPI_NSS = obj->nss;
mbed_official 84:f54042cbc282 68 SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
mbed_official 84:f54042cbc282 69 SPI_InitStructure.SPI_DataSize = obj->bits;
mbed_official 84:f54042cbc282 70 SPI_InitStructure.SPI_CPOL = obj->cpol;
mbed_official 84:f54042cbc282 71 SPI_InitStructure.SPI_CPHA = obj->cpha;
mbed_official 84:f54042cbc282 72 SPI_InitStructure.SPI_BaudRatePrescaler = obj->br_presc;
mbed_official 84:f54042cbc282 73 SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
mbed_official 84:f54042cbc282 74 SPI_InitStructure.SPI_CRCPolynomial = 7;
mbed_official 84:f54042cbc282 75 SPI_Init(spi, &SPI_InitStructure);
mbed_official 84:f54042cbc282 76
mbed_official 84:f54042cbc282 77 SPI_RxFIFOThresholdConfig(spi, SPI_RxFIFOThreshold_QF);
mbed_official 84:f54042cbc282 78
mbed_official 84:f54042cbc282 79 SPI_Cmd(spi, ENABLE);
mbed_official 84:f54042cbc282 80 }
mbed_official 84:f54042cbc282 81
mbed_official 84:f54042cbc282 82 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel) {
mbed_official 84:f54042cbc282 83 // Determine the SPI to use
mbed_official 84:f54042cbc282 84 SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
mbed_official 84:f54042cbc282 85 SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
mbed_official 84:f54042cbc282 86 SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
mbed_official 84:f54042cbc282 87 SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
mbed_official 84:f54042cbc282 88
mbed_official 84:f54042cbc282 89 SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
mbed_official 84:f54042cbc282 90 SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
mbed_official 84:f54042cbc282 91
mbed_official 84:f54042cbc282 92 obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
mbed_official 84:f54042cbc282 93
mbed_official 84:f54042cbc282 94 if (obj->spi == (SPIName)NC) {
mbed_official 84:f54042cbc282 95 error("SPI pinout mapping failed");
mbed_official 84:f54042cbc282 96 }
mbed_official 84:f54042cbc282 97
mbed_official 84:f54042cbc282 98 // Enable SPI clock
mbed_official 84:f54042cbc282 99 if (obj->spi == SPI_1) {
mbed_official 84:f54042cbc282 100 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
mbed_official 84:f54042cbc282 101 }
mbed_official 84:f54042cbc282 102 if (obj->spi == SPI_2) {
mbed_official 84:f54042cbc282 103 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
mbed_official 84:f54042cbc282 104 }
mbed_official 84:f54042cbc282 105
mbed_official 84:f54042cbc282 106 // Configure the SPI pins
mbed_official 84:f54042cbc282 107 pinmap_pinout(mosi, PinMap_SPI_MOSI);
mbed_official 84:f54042cbc282 108 pinmap_pinout(miso, PinMap_SPI_MISO);
mbed_official 84:f54042cbc282 109 pinmap_pinout(sclk, PinMap_SPI_SCLK);
mbed_official 84:f54042cbc282 110
mbed_official 84:f54042cbc282 111 // Save new values
mbed_official 84:f54042cbc282 112 obj->bits = SPI_DataSize_8b;
mbed_official 84:f54042cbc282 113 obj->cpol = SPI_CPOL_Low;
mbed_official 84:f54042cbc282 114 obj->cpha = SPI_CPHA_1Edge;
mbed_official 84:f54042cbc282 115 obj->br_presc = SPI_BaudRatePrescaler_8; // 1 MHz
mbed_official 84:f54042cbc282 116
mbed_official 84:f54042cbc282 117 if (ssel == NC) { // Master
mbed_official 84:f54042cbc282 118 obj->mode = SPI_Mode_Master;
mbed_official 84:f54042cbc282 119 obj->nss = SPI_NSS_Soft;
mbed_official 84:f54042cbc282 120 }
mbed_official 84:f54042cbc282 121 else { // Slave
mbed_official 84:f54042cbc282 122 pinmap_pinout(ssel, PinMap_SPI_SSEL);
mbed_official 84:f54042cbc282 123 obj->mode = SPI_Mode_Slave;
mbed_official 84:f54042cbc282 124 obj->nss = SPI_NSS_Soft;
mbed_official 84:f54042cbc282 125 }
mbed_official 84:f54042cbc282 126
mbed_official 84:f54042cbc282 127 init_spi(obj);
mbed_official 84:f54042cbc282 128 }
mbed_official 84:f54042cbc282 129
mbed_official 84:f54042cbc282 130 void spi_free(spi_t *obj) {
mbed_official 84:f54042cbc282 131 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 84:f54042cbc282 132 SPI_I2S_DeInit(spi);
mbed_official 84:f54042cbc282 133 }
mbed_official 84:f54042cbc282 134
mbed_official 84:f54042cbc282 135 void spi_format(spi_t *obj, int bits, int mode, int slave) {
mbed_official 84:f54042cbc282 136 // Save new values
mbed_official 84:f54042cbc282 137 if (bits == 8) {
mbed_official 84:f54042cbc282 138 obj->bits = SPI_DataSize_8b;
mbed_official 84:f54042cbc282 139 }
mbed_official 84:f54042cbc282 140 else {
mbed_official 84:f54042cbc282 141 obj->bits = SPI_DataSize_16b;
mbed_official 84:f54042cbc282 142 }
mbed_official 84:f54042cbc282 143
mbed_official 84:f54042cbc282 144 switch (mode) {
mbed_official 84:f54042cbc282 145 case 0:
mbed_official 84:f54042cbc282 146 obj->cpol = SPI_CPOL_Low;
mbed_official 84:f54042cbc282 147 obj->cpha = SPI_CPHA_1Edge;
mbed_official 84:f54042cbc282 148 break;
mbed_official 84:f54042cbc282 149 case 1:
mbed_official 84:f54042cbc282 150 obj->cpol = SPI_CPOL_Low;
mbed_official 84:f54042cbc282 151 obj->cpha = SPI_CPHA_2Edge;
mbed_official 84:f54042cbc282 152 break;
mbed_official 84:f54042cbc282 153 case 2:
mbed_official 84:f54042cbc282 154 obj->cpol = SPI_CPOL_High;
mbed_official 84:f54042cbc282 155 obj->cpha = SPI_CPHA_1Edge;
mbed_official 84:f54042cbc282 156 break;
mbed_official 84:f54042cbc282 157 default:
mbed_official 84:f54042cbc282 158 obj->cpol = SPI_CPOL_High;
mbed_official 84:f54042cbc282 159 obj->cpha = SPI_CPHA_2Edge;
mbed_official 84:f54042cbc282 160 break;
mbed_official 84:f54042cbc282 161 }
mbed_official 84:f54042cbc282 162
mbed_official 84:f54042cbc282 163 if (slave == 0) {
mbed_official 84:f54042cbc282 164 obj->mode = SPI_Mode_Master;
mbed_official 84:f54042cbc282 165 obj->nss = SPI_NSS_Soft;
mbed_official 84:f54042cbc282 166 }
mbed_official 84:f54042cbc282 167 else {
mbed_official 84:f54042cbc282 168 obj->mode = SPI_Mode_Slave;
mbed_official 84:f54042cbc282 169 obj->nss = SPI_NSS_Hard;
mbed_official 84:f54042cbc282 170 }
mbed_official 84:f54042cbc282 171
mbed_official 84:f54042cbc282 172 init_spi(obj);
mbed_official 84:f54042cbc282 173 }
mbed_official 84:f54042cbc282 174
mbed_official 84:f54042cbc282 175 void spi_frequency(spi_t *obj, int hz) {
mbed_official 84:f54042cbc282 176 // Get SPI clock frequency
mbed_official 84:f54042cbc282 177 uint32_t PCLK = SystemCoreClock;
mbed_official 84:f54042cbc282 178
mbed_official 84:f54042cbc282 179 // Choose the baud rate divisor (between 2 and 256)
mbed_official 84:f54042cbc282 180 uint32_t divisor = PCLK / hz;
mbed_official 84:f54042cbc282 181
mbed_official 84:f54042cbc282 182 // Find the nearest power-of-2
mbed_official 84:f54042cbc282 183 divisor = (divisor > 0 ? divisor-1 : 0);
mbed_official 84:f54042cbc282 184 divisor |= divisor >> 1;
mbed_official 84:f54042cbc282 185 divisor |= divisor >> 2;
mbed_official 84:f54042cbc282 186 divisor |= divisor >> 4;
mbed_official 84:f54042cbc282 187 divisor |= divisor >> 8;
mbed_official 84:f54042cbc282 188 divisor |= divisor >> 16;
mbed_official 84:f54042cbc282 189 divisor++;
mbed_official 84:f54042cbc282 190
mbed_official 84:f54042cbc282 191 uint32_t baud_rate = __builtin_ffs(divisor) - 2;
mbed_official 84:f54042cbc282 192
mbed_official 84:f54042cbc282 193 // Save new value
mbed_official 84:f54042cbc282 194 obj->br_presc = ((baud_rate > 7) ? (7 << 3) : (baud_rate << 3));
mbed_official 84:f54042cbc282 195
mbed_official 84:f54042cbc282 196 init_spi(obj);
mbed_official 84:f54042cbc282 197 }
mbed_official 84:f54042cbc282 198
mbed_official 84:f54042cbc282 199 static inline int ssp_readable(spi_t *obj) {
mbed_official 84:f54042cbc282 200 int status;
mbed_official 84:f54042cbc282 201 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 84:f54042cbc282 202 // Check if data is received
mbed_official 84:f54042cbc282 203 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_RXNE) != RESET) ? 1 : 0);
mbed_official 84:f54042cbc282 204 return status;
mbed_official 84:f54042cbc282 205 }
mbed_official 84:f54042cbc282 206
mbed_official 84:f54042cbc282 207 static inline int ssp_writeable(spi_t *obj) {
mbed_official 84:f54042cbc282 208 int status;
mbed_official 84:f54042cbc282 209 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 84:f54042cbc282 210 // Check if data is transmitted
mbed_official 84:f54042cbc282 211 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_TXE) != RESET) ? 1 : 0);
mbed_official 84:f54042cbc282 212 return status;
mbed_official 84:f54042cbc282 213 }
mbed_official 84:f54042cbc282 214
mbed_official 84:f54042cbc282 215 static inline void ssp_write(spi_t *obj, int value) {
mbed_official 84:f54042cbc282 216 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 84:f54042cbc282 217 while (!ssp_writeable(obj));
mbed_official 84:f54042cbc282 218 SPI_SendData8(spi, (uint8_t)value);
mbed_official 84:f54042cbc282 219 }
mbed_official 84:f54042cbc282 220
mbed_official 84:f54042cbc282 221 static inline int ssp_read(spi_t *obj) {
mbed_official 84:f54042cbc282 222 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 84:f54042cbc282 223 while (!ssp_readable(obj));
mbed_official 84:f54042cbc282 224 return (int)SPI_ReceiveData8(spi);
mbed_official 84:f54042cbc282 225 }
mbed_official 84:f54042cbc282 226
mbed_official 84:f54042cbc282 227 static inline int ssp_busy(spi_t *obj) {
mbed_official 84:f54042cbc282 228 int status;
mbed_official 84:f54042cbc282 229 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 84:f54042cbc282 230 status = ((SPI_I2S_GetFlagStatus(spi, SPI_I2S_FLAG_BSY) != RESET) ? 1 : 0);
mbed_official 84:f54042cbc282 231 return status;
mbed_official 84:f54042cbc282 232 }
mbed_official 84:f54042cbc282 233
mbed_official 84:f54042cbc282 234 int spi_master_write(spi_t *obj, int value) {
mbed_official 84:f54042cbc282 235 ssp_write(obj, value);
mbed_official 84:f54042cbc282 236 return ssp_read(obj);
mbed_official 84:f54042cbc282 237 }
mbed_official 84:f54042cbc282 238
mbed_official 84:f54042cbc282 239 int spi_slave_receive(spi_t *obj) {
mbed_official 84:f54042cbc282 240 return (ssp_readable(obj) && !ssp_busy(obj)) ? (1) : (0);
mbed_official 84:f54042cbc282 241 };
mbed_official 84:f54042cbc282 242
mbed_official 84:f54042cbc282 243 int spi_slave_read(spi_t *obj) {
mbed_official 84:f54042cbc282 244 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 84:f54042cbc282 245 return (int)SPI_ReceiveData8(spi);
mbed_official 84:f54042cbc282 246 }
mbed_official 84:f54042cbc282 247
mbed_official 84:f54042cbc282 248 void spi_slave_write(spi_t *obj, int value) {
mbed_official 84:f54042cbc282 249 SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
mbed_official 84:f54042cbc282 250 while (!ssp_writeable(obj));
mbed_official 84:f54042cbc282 251 SPI_SendData8(spi, (uint8_t)value);
mbed_official 84:f54042cbc282 252 }
mbed_official 84:f54042cbc282 253
mbed_official 84:f54042cbc282 254 int spi_busy(spi_t *obj) {
mbed_official 84:f54042cbc282 255 return ssp_busy(obj);
mbed_official 84:f54042cbc282 256 }
mbed_official 84:f54042cbc282 257
mbed_official 84:f54042cbc282 258 #endif