tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32F4/spi_api.c

   1 /* mbed Microcontroller Library
   2  *******************************************************************************
   3  * Copyright (c) 2014, STMicroelectronics
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright notice,
  10  *    this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright notice,
  12  *    this list of conditions and the following disclaimer in the documentation
  13  *    and/or other materials provided with the distribution.
  14  * 3. Neither the name of STMicroelectronics nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  21  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  25  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  26  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *******************************************************************************
  29  */
  30 #include "mbed_assert.h"
  31 #include "spi_api.h"
  32
  33 #if DEVICE_SPI
  34
  35 #include <math.h>
  36 #include "cmsis.h"
  37 #include "pinmap.h"
  38 #include "PeripheralPins.h"
  39
  40 static SPI_HandleTypeDef SpiHandle;
  41
  42 static void init_spi(spi_t *obj)
  43 {
  44     SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
  45
  46     __HAL_SPI_DISABLE(&SpiHandle);
  47
  48     SpiHandle.Init.Mode              = obj->mode;
  49     SpiHandle.Init.BaudRatePrescaler = obj->br_presc;
  50     SpiHandle.Init.Direction         = SPI_DIRECTION_2LINES;
  51     SpiHandle.Init.CLKPhase          = obj->cpha;
  52     SpiHandle.Init.CLKPolarity       = obj->cpol;
  53     SpiHandle.Init.CRCCalculation    = SPI_CRCCALCULATION_DISABLED;
  54     SpiHandle.Init.CRCPolynomial     = 7;
  55     SpiHandle.Init.DataSize          = obj->bits;
  56     SpiHandle.Init.FirstBit          = SPI_FIRSTBIT_MSB;
  57     SpiHandle.Init.NSS               = obj->nss;
  58     SpiHandle.Init.TIMode            = SPI_TIMODE_DISABLED;
  59
  60     HAL_SPI_Init(&SpiHandle);
  61
  62     __HAL_SPI_ENABLE(&SpiHandle);
  63 }
  64
  65 void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
  66 {
  67     // Determine the SPI to use
  68     SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
  69     SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
  70     SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
  71     SPIName spi_ssel = (SPIName)pinmap_peripheral(ssel, PinMap_SPI_SSEL);
  72
  73     SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
  74     SPIName spi_cntl = (SPIName)pinmap_merge(spi_sclk, spi_ssel);
  75
  76     obj->spi = (SPIName)pinmap_merge(spi_data, spi_cntl);
  77     MBED_ASSERT(obj->spi != (SPIName)NC);
  78
  79     // Enable SPI clock
  80     if (obj->spi == SPI_1) {
  81         __SPI1_CLK_ENABLE();
  82     }
  83
  84     if (obj->spi == SPI_2) {
  85         __SPI2_CLK_ENABLE();
  86     }
  87
  88     if (obj->spi == SPI_3) {
  89         __SPI3_CLK_ENABLE();
  90     }
  91
  92 #if defined SPI4_BASE
  93     if (obj->spi == SPI_4) {
  94         __SPI4_CLK_ENABLE();
  95     }
  96 #endif
  97
  98 #if defined SPI5_BASE
  99     if (obj->spi == SPI_5) {
 100         __SPI5_CLK_ENABLE();
 101     }
 102 #endif
 103
 104     // Configure the SPI pins
 105     pinmap_pinout(mosi, PinMap_SPI_MOSI);
 106     pinmap_pinout(miso, PinMap_SPI_MISO);
 107     pinmap_pinout(sclk, PinMap_SPI_SCLK);
 108
 109     // Save new values
 110     obj->bits = SPI_DATASIZE_8BIT;
 111     obj->cpol = SPI_POLARITY_LOW;
 112     obj->cpha = SPI_PHASE_1EDGE;
 113     obj->br_presc = SPI_BAUDRATEPRESCALER_256;
 114
 115     obj->pin_miso = miso;
 116     obj->pin_mosi = mosi;
 117     obj->pin_sclk = sclk;
 118     obj->pin_ssel = ssel;
 119
 120     if (ssel == NC) { // SW NSS Master mode
 121         obj->mode = SPI_MODE_MASTER;
 122         obj->nss = SPI_NSS_SOFT;
 123     } else { // Slave
 124         pinmap_pinout(ssel, PinMap_SPI_SSEL);
 125         obj->mode = SPI_MODE_SLAVE;
 126         obj->nss = SPI_NSS_HARD_INPUT;
 127     }
 128
 129     init_spi(obj);
 130 }
 131
 132 void spi_free(spi_t *obj)
 133 {
 134     // Reset SPI and disable clock
 135     if (obj->spi == SPI_1) {
 136         __SPI1_FORCE_RESET();
 137         __SPI1_RELEASE_RESET();
 138         __SPI1_CLK_DISABLE();
 139     }
 140
 141     if (obj->spi == SPI_2) {
 142         __SPI2_FORCE_RESET();
 143         __SPI2_RELEASE_RESET();
 144         __SPI2_CLK_DISABLE();
 145     }
 146
 147     if (obj->spi == SPI_3) {
 148         __SPI3_FORCE_RESET();
 149         __SPI3_RELEASE_RESET();
 150         __SPI3_CLK_DISABLE();
 151     }
 152
 153 #if defined SPI4_BASE
 154     if (obj->spi == SPI_4) {
 155         __SPI4_FORCE_RESET();
 156         __SPI4_RELEASE_RESET();
 157         __SPI4_CLK_DISABLE();
 158     }
 159 #endif
 160
 161 #if defined SPI5_BASE
 162     if (obj->spi == SPI_5) {
 163         __SPI5_FORCE_RESET();
 164         __SPI5_RELEASE_RESET();
 165         __SPI5_CLK_DISABLE();
 166     }
 167 #endif
 168
 169     // Configure GPIOs
 170     pin_function(obj->pin_miso, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
 171     pin_function(obj->pin_mosi, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
 172     pin_function(obj->pin_sclk, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
 173     pin_function(obj->pin_ssel, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
 174 }
 175
 176 void spi_format(spi_t *obj, int bits, int mode, int slave)
 177 {
 178     // Save new values
 179     if (bits == 16) {
 180         obj->bits = SPI_DATASIZE_16BIT;
 181     } else {
 182         obj->bits = SPI_DATASIZE_8BIT;
 183     }
 184
 185     switch (mode) {
 186         case 0:
 187             obj->cpol = SPI_POLARITY_LOW;
 188             obj->cpha = SPI_PHASE_1EDGE;
 189             break;
 190         case 1:
 191             obj->cpol = SPI_POLARITY_LOW;
 192             obj->cpha = SPI_PHASE_2EDGE;
 193             break;
 194         case 2:
 195             obj->cpol = SPI_POLARITY_HIGH;
 196             obj->cpha = SPI_PHASE_1EDGE;
 197             break;
 198         default:
 199             obj->cpol = SPI_POLARITY_HIGH;
 200             obj->cpha = SPI_PHASE_2EDGE;
 201             break;
 202     }
 203
 204     if (slave == 0) {
 205         obj->mode = SPI_MODE_MASTER;
 206         obj->nss = SPI_NSS_SOFT;
 207     } else {
 208         obj->mode = SPI_MODE_SLAVE;
 209         obj->nss = SPI_NSS_HARD_INPUT;
 210     }
 211
 212     init_spi(obj);
 213 }
 214
 215 void spi_frequency(spi_t *obj, int hz)
 216 {
 217 #if defined(TARGET_STM32F401RE) || defined(TARGET_STM32F401VC) || defined(TARGET_F407VG)
 218     // Note: The frequencies are obtained with SPI1 clock = 84 MHz (APB2 clock)
 219     if (hz < 600000) {
 220         obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 330 kHz
 221     } else if ((hz >= 600000) && (hz < 1000000)) {
 222         obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 656 kHz
 223     } else if ((hz >= 1000000) && (hz < 2000000)) {
 224         obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 1.3 MHz
 225     } else if ((hz >= 2000000) && (hz < 5000000)) {
 226         obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 2.6 MHz
 227     } else if ((hz >= 5000000) && (hz < 10000000)) {
 228         obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 5.25 MHz
 229     } else if ((hz >= 10000000) && (hz < 21000000)) {
 230         obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 10.5 MHz
 231     } else if ((hz >= 21000000) && (hz < 42000000)) {
 232         obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 21 MHz
 233     } else { // >= 42000000
 234         obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 42 MHz
 235     }
 236 #elif defined(TARGET_STM32F405RG)
 237     // Note: The frequencies are obtained with SPI1 clock = 48 MHz (APB2 clock)
 238     if (obj->spi == SPI_1) {
 239         if (hz < 375000) {
 240             obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 187.5 kHz
 241         } else if ((hz >= 375000) && (hz < 750000)) {
 242             obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
 243         } else if ((hz >= 750000) && (hz < 1500000)) {
 244             obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 0.75 MHz
 245         } else if ((hz >= 1500000) && (hz < 3000000)) {
 246             obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz
 247         } else if ((hz >= 3000000) && (hz < 6000000)) {
 248             obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
 249         } else if ((hz >= 6000000) && (hz < 12000000)) {
 250             obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
 251         } else if ((hz >= 12000000) && (hz < 24000000)) {
 252             obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
 253         } else { // >= 24000000
 254             obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
 255         }
 256     // Note: The frequencies are obtained with SPI2/3 clock = 48 MHz (APB1 clock)
 257     } else if ((obj->spi == SPI_2) || (obj->spi == SPI_3)) {
 258         if (hz < 375000) {
 259             obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 187.5 kHz
 260         } else if ((hz >= 375000) && (hz < 750000)) {
 261             obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 375 kHz
 262         } else if ((hz >= 750000) && (hz < 1500000)) {
 263             obj->br_presc = SPI_BAUDRATEPRESCALER_64; // 0.75 MHz
 264         } else if ((hz >= 1500000) && (hz < 3000000)) {
 265             obj->br_presc = SPI_BAUDRATEPRESCALER_32; // 1.5 MHz
 266         } else if ((hz >= 3000000) && (hz < 6000000)) {
 267             obj->br_presc = SPI_BAUDRATEPRESCALER_16; // 3 MHz
 268         } else if ((hz >= 6000000) && (hz < 12000000)) {
 269             obj->br_presc = SPI_BAUDRATEPRESCALER_8; // 6 MHz
 270         } else if ((hz >= 12000000) && (hz < 24000000)) {
 271             obj->br_presc = SPI_BAUDRATEPRESCALER_4; // 12 MHz
 272         } else { // >= 24000000
 273             obj->br_presc = SPI_BAUDRATEPRESCALER_2; // 24 MHz
 274         }
 275     }
 276 #elif defined(TARGET_STM32F411RE) || defined(TARGET_STM32F429ZI)
 277     // Values depend of PCLK2: 100 MHz
 278     if ((obj->spi == SPI_1) || (obj->spi == SPI_4) || (obj->spi == SPI_5)) {
 279         if (hz < 700000) {
 280             obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 391 kHz
 281         } else if ((hz >= 700000) && (hz < 1000000)) {
 282             obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 781 kHz
 283         } else if ((hz >= 1000000) && (hz < 3000000)) {
 284             obj->br_presc = SPI_BAUDRATEPRESCALER_64;  // 1.56 MHz
 285         } else if ((hz >= 3000000) && (hz < 6000000)) {
 286             obj->br_presc = SPI_BAUDRATEPRESCALER_32;  // 3.13 MHz
 287         } else if ((hz >= 6000000) && (hz < 12000000)) {
 288             obj->br_presc = SPI_BAUDRATEPRESCALER_16;  // 6.25 MHz
 289         } else if ((hz >= 12000000) && (hz < 25000000)) {
 290             obj->br_presc = SPI_BAUDRATEPRESCALER_8;   // 12.5 MHz
 291         } else if ((hz >= 25000000) && (hz < 50000000)) {
 292             obj->br_presc = SPI_BAUDRATEPRESCALER_4;   // 25 MHz
 293         } else { // >= 50000000
 294             obj->br_presc = SPI_BAUDRATEPRESCALER_2;   // 50 MHz
 295         }
 296     }
 297
 298     // Values depend of PCLK1: 50 MHz
 299     if ((obj->spi == SPI_2) || (obj->spi == SPI_3)) {
 300         if (hz < 400000) {
 301             obj->br_presc = SPI_BAUDRATEPRESCALER_256; // 195 kHz
 302         } else if ((hz >= 400000) && (hz < 700000)) {
 303             obj->br_presc = SPI_BAUDRATEPRESCALER_128; // 391 kHz
 304         } else if ((hz >= 700000) && (hz < 1000000)) {
 305             obj->br_presc = SPI_BAUDRATEPRESCALER_64;  // 781 MHz
 306         } else if ((hz >= 1000000) && (hz < 3000000)) {
 307             obj->br_presc = SPI_BAUDRATEPRESCALER_32;  // 1.56 MHz
 308         } else if ((hz >= 3000000) && (hz < 6000000)) {
 309             obj->br_presc = SPI_BAUDRATEPRESCALER_16;  // 3.13 MHz
 310         } else if ((hz >= 6000000) && (hz < 12000000)) {
 311             obj->br_presc = SPI_BAUDRATEPRESCALER_8;   // 6.25 MHz
 312         } else if ((hz >= 12000000) && (hz < 25000000)) {
 313             obj->br_presc = SPI_BAUDRATEPRESCALER_4;   // 12.5 MHz
 314         } else { // >= 25000000
 315             obj->br_presc = SPI_BAUDRATEPRESCALER_2;   // 25 MHz
 316         }
 317     }
 318 #endif
 319     init_spi(obj);
 320 }
 321
 322 static inline int ssp_readable(spi_t *obj)
 323 {
 324     int status;
 325     SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
 326     // Check if data is received
 327     status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
 328     return status;
 329 }
 330
 331 static inline int ssp_writeable(spi_t *obj)
 332 {
 333     int status;
 334     SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
 335     // Check if data is transmitted
 336     status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
 337     return status;
 338 }
 339
 340 static inline void ssp_write(spi_t *obj, int value)
 341 {
 342     SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
 343     while (!ssp_writeable(obj));
 344     spi->DR = (uint16_t)value;
 345 }
 346
 347 static inline int ssp_read(spi_t *obj)
 348 {
 349     SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
 350     while (!ssp_readable(obj));
 351     return (int)spi->DR;
 352 }
 353
 354 static inline int ssp_busy(spi_t *obj)
 355 {
 356     int status;
 357     SpiHandle.Instance = (SPI_TypeDef *)(obj->spi);
 358     status = ((__HAL_SPI_GET_FLAG(&SpiHandle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
 359     return status;
 360 }
 361
 362 int spi_master_write(spi_t *obj, int value)
 363 {
 364     ssp_write(obj, value);
 365     return ssp_read(obj);
 366 }
 367
 368 int spi_slave_receive(spi_t *obj)
 369 {
 370     return ((ssp_readable(obj) && !ssp_busy(obj)) ? 1 : 0);
 371 };
 372
 373 int spi_slave_read(spi_t *obj)
 374 {
 375     SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
 376     while (!ssp_readable(obj));
 377     return (int)spi->DR;
 378 }
 379
 380 void spi_slave_write(spi_t *obj, int value)
 381 {
 382     SPI_TypeDef *spi = (SPI_TypeDef *)(obj->spi);
 383     while (!ssp_writeable(obj));
 384     spi->DR = (uint16_t)value;
 385 }
 386
 387 int spi_busy(spi_t *obj)
 388 {
 389     return ssp_busy(obj);
 390 }
 391
 392 #endif