tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_STM/TARGET_STM32L1/serial_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 "serial_api.h"
  32
  33 #if DEVICE_SERIAL
  34
  35 #include "cmsis.h"
  36 #include "pinmap.h"
  37 #include <string.h>
  38 #include "PeripheralPins.h"
  39
  40 #define UART_NUM (5)
  41
  42 static uint32_t serial_irq_ids[UART_NUM] = {0, 0, 0, 0, 0};
  43
  44 static uart_irq_handler irq_handler;
  45
  46 UART_HandleTypeDef UartHandle;
  47
  48 int stdio_uart_inited = 0;
  49 serial_t stdio_uart;
  50
  51 static void init_uart(serial_t *obj)
  52 {
  53     UartHandle.Instance = (USART_TypeDef *)(obj->uart);
  54
  55     UartHandle.Init.BaudRate   = obj->baudrate;
  56     UartHandle.Init.WordLength = obj->databits;
  57     UartHandle.Init.StopBits   = obj->stopbits;
  58     UartHandle.Init.Parity     = obj->parity;
  59     UartHandle.Init.HwFlowCtl  = UART_HWCONTROL_NONE;
  60
  61     if (obj->pin_rx == NC) {
  62         UartHandle.Init.Mode = UART_MODE_TX;
  63     } else if (obj->pin_tx == NC) {
  64         UartHandle.Init.Mode = UART_MODE_RX;
  65     } else {
  66         UartHandle.Init.Mode = UART_MODE_TX_RX;
  67     }
  68
  69     HAL_UART_Init(&UartHandle);
  70 }
  71
  72 void serial_init(serial_t *obj, PinName tx, PinName rx)
  73 {
  74     // Determine the UART to use (UART_1, UART_2, ...)
  75     UARTName uart_tx = (UARTName)pinmap_peripheral(tx, PinMap_UART_TX);
  76     UARTName uart_rx = (UARTName)pinmap_peripheral(rx, PinMap_UART_RX);
  77
  78     // Get the peripheral name (UART_1, UART_2, ...) from the pin and assign it to the object
  79     obj->uart = (UARTName)pinmap_merge(uart_tx, uart_rx);
  80     MBED_ASSERT(obj->uart != (UARTName)NC);
  81
  82     // Enable UART clock
  83     if (obj->uart == UART_1) {
  84         __USART1_CLK_ENABLE();
  85         obj->index = 0;
  86     }
  87
  88     if (obj->uart == UART_2) {
  89         __USART2_CLK_ENABLE();
  90         obj->index = 1;
  91     }
  92
  93     if (obj->uart == UART_3) {
  94         __USART3_CLK_ENABLE();
  95         obj->index = 2;
  96     }
  97
  98 #if defined(USART4_BASE)
  99     if (obj->uart == UART_4) {
 100         __UART4_CLK_ENABLE();
 101         obj->index = 3;
 102     }
 103 #endif
 104 #if defined(USART5_BASE)
 105     if (obj->uart == UART_5) {
 106         __UART5_CLK_ENABLE();
 107         obj->index = 4;
 108     }
 109 #endif
 110
 111     // Configure the UART pins
 112     pinmap_pinout(tx, PinMap_UART_TX);
 113     pinmap_pinout(rx, PinMap_UART_RX);
 114     if (tx != NC) {
 115         pin_mode(tx, PullUp);
 116     }
 117     if (rx != NC) {
 118         pin_mode(rx, PullUp);
 119     }
 120
 121     // Configure UART
 122     obj->baudrate = 9600;
 123     obj->databits = UART_WORDLENGTH_8B;
 124     obj->stopbits = UART_STOPBITS_1;
 125     obj->parity   = UART_PARITY_NONE;
 126     obj->pin_tx   = tx;
 127     obj->pin_rx   = rx;
 128
 129     init_uart(obj);
 130
 131     // For stdio management
 132     if (obj->uart == STDIO_UART) {
 133         stdio_uart_inited = 1;
 134         memcpy(&stdio_uart, obj, sizeof(serial_t));
 135     }
 136 }
 137
 138 void serial_free(serial_t *obj)
 139 {
 140     // Reset UART and disable clock
 141     if (obj->uart == UART_1) {
 142         __USART1_FORCE_RESET();
 143         __USART1_RELEASE_RESET();
 144         __USART1_CLK_DISABLE();
 145     }
 146
 147     if (obj->uart == UART_2) {
 148         __USART2_FORCE_RESET();
 149         __USART2_RELEASE_RESET();
 150         __USART2_CLK_DISABLE();
 151     }
 152
 153     if (obj->uart == UART_3) {
 154         __USART3_FORCE_RESET();
 155         __USART3_RELEASE_RESET();
 156         __USART3_CLK_DISABLE();
 157     }
 158
 159 #if defined(USART4_BASE)
 160     if (obj->uart == UART_4) {
 161         __UART4_FORCE_RESET();
 162         __UART4_RELEASE_RESET();
 163         __UART4_CLK_DISABLE();
 164     }
 165 #endif
 166 #if defined(USART5_BASE)
 167     if (obj->uart == UART_5) {
 168         __UART5_FORCE_RESET();
 169         __UART5_RELEASE_RESET();
 170         __UART5_CLK_DISABLE();
 171     }
 172 #endif
 173
 174     // Configure GPIOs
 175     pin_function(obj->pin_tx, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
 176     pin_function(obj->pin_rx, STM_PIN_DATA(STM_MODE_INPUT, GPIO_NOPULL, 0));
 177
 178     serial_irq_ids[obj->index] = 0;
 179 }
 180
 181 void serial_baud(serial_t *obj, int baudrate)
 182 {
 183     obj->baudrate = baudrate;
 184     init_uart(obj);
 185 }
 186
 187 void serial_format(serial_t *obj, int data_bits, SerialParity parity, int stop_bits)
 188 {
 189     if (data_bits == 9) {
 190         obj->databits = UART_WORDLENGTH_9B;
 191     } else {
 192         obj->databits = UART_WORDLENGTH_8B;
 193     }
 194
 195     switch (parity) {
 196         case ParityOdd:
 197         case ParityForced0:
 198             obj->parity = UART_PARITY_ODD;
 199             break;
 200         case ParityEven:
 201         case ParityForced1:
 202             obj->parity = UART_PARITY_EVEN;
 203             break;
 204         default: // ParityNone
 205             obj->parity = UART_PARITY_NONE;
 206             break;
 207     }
 208
 209     if (stop_bits == 2) {
 210         obj->stopbits = UART_STOPBITS_2;
 211     } else {
 212         obj->stopbits = UART_STOPBITS_1;
 213     }
 214
 215     init_uart(obj);
 216 }
 217
 218 /******************************************************************************
 219  * INTERRUPTS HANDLING
 220  ******************************************************************************/
 221
 222 static void uart_irq(UARTName name, int id)
 223 {
 224     UartHandle.Instance = (USART_TypeDef *)name;
 225     if (serial_irq_ids[id] != 0) {
 226         if (__HAL_UART_GET_FLAG(&UartHandle, UART_FLAG_TC) != RESET) {
 227             irq_handler(serial_irq_ids[id], TxIrq);
 228             __HAL_UART_CLEAR_FLAG(&UartHandle, UART_FLAG_TC);
 229         }
 230         if (__HAL_UART_GET_FLAG(&UartHandle, UART_FLAG_RXNE) != RESET) {
 231             irq_handler(serial_irq_ids[id], RxIrq);
 232             __HAL_UART_CLEAR_FLAG(&UartHandle, UART_FLAG_RXNE);
 233         }
 234     }
 235 }
 236
 237 static void uart1_irq(void)
 238 {
 239     uart_irq(UART_1, 0);
 240 }
 241
 242 static void uart2_irq(void)
 243 {
 244     uart_irq(UART_2, 1);
 245 }
 246
 247 static void uart3_irq(void)
 248 {
 249     uart_irq(UART_3, 2);
 250 }
 251
 252 #if defined(USART4_BASE)
 253 static void uart4_irq(void)
 254 {
 255     uart_irq(UART_4, 3);
 256 }
 257 #endif
 258
 259 #if defined(USART5_BASE)
 260 static void uart5_irq(void)
 261 {
 262     uart_irq(UART_5, 4);
 263 }
 264 #endif
 265
 266 void serial_irq_handler(serial_t *obj, uart_irq_handler handler, uint32_t id)
 267 {
 268     irq_handler = handler;
 269     serial_irq_ids[obj->index] = id;
 270 }
 271
 272 void serial_irq_set(serial_t *obj, SerialIrq irq, uint32_t enable)
 273 {
 274     IRQn_Type irq_n = (IRQn_Type)0;
 275     uint32_t vector = 0;
 276
 277     UartHandle.Instance = (USART_TypeDef *)(obj->uart);
 278
 279     if (obj->uart == UART_1) {
 280         irq_n = USART1_IRQn;
 281         vector = (uint32_t)&uart1_irq;
 282     }
 283
 284     if (obj->uart == UART_2) {
 285         irq_n = USART2_IRQn;
 286         vector = (uint32_t)&uart2_irq;
 287     }
 288
 289     if (obj->uart == UART_3) {
 290         irq_n = USART3_IRQn;
 291         vector = (uint32_t)&uart3_irq;
 292     }
 293
 294 #if defined(USART4_BASE)
 295     if (obj->uart == UART_4) {
 296         irq_n = UART4_IRQn;
 297         vector = (uint32_t)&uart4_irq;
 298     }
 299 #endif
 300
 301 #if defined(USART5_BASE)
 302     if (obj->uart == UART_5) {
 303         irq_n = UART5_IRQn;
 304         vector = (uint32_t)&uart5_irq;
 305     }
 306 #endif
 307
 308     if (enable) {
 309
 310         if (irq == RxIrq) {
 311             __HAL_UART_ENABLE_IT(&UartHandle, UART_IT_RXNE);
 312         } else { // TxIrq
 313             __HAL_UART_ENABLE_IT(&UartHandle, UART_IT_TC);
 314         }
 315
 316         NVIC_SetVector(irq_n, vector);
 317         NVIC_EnableIRQ(irq_n);
 318
 319     } else { // disable
 320
 321         int all_disabled = 0;
 322
 323         if (irq == RxIrq) {
 324             __HAL_UART_DISABLE_IT(&UartHandle, UART_IT_RXNE);
 325             // Check if TxIrq is disabled too
 326             if ((UartHandle.Instance->CR1 & USART_CR1_TXEIE) == 0) all_disabled = 1;
 327         } else { // TxIrq
 328             __HAL_UART_DISABLE_IT(&UartHandle, UART_IT_TXE);
 329             // Check if RxIrq is disabled too
 330             if ((UartHandle.Instance->CR1 & USART_CR1_RXNEIE) == 0) all_disabled = 1;
 331         }
 332
 333         if (all_disabled) NVIC_DisableIRQ(irq_n);
 334
 335     }
 336 }
 337
 338 /******************************************************************************
 339  * READ/WRITE
 340  ******************************************************************************/
 341
 342 int serial_getc(serial_t *obj)
 343 {
 344     USART_TypeDef *uart = (USART_TypeDef *)(obj->uart);
 345     while (!serial_readable(obj));
 346     return (int)(uart->DR & 0xFF);
 347 }
 348
 349 void serial_putc(serial_t *obj, int c)
 350 {
 351     USART_TypeDef *uart = (USART_TypeDef *)(obj->uart);
 352     while (!serial_writable(obj));
 353     uart->DR = (uint32_t)(c & 0xFF);
 354 }
 355
 356 int serial_readable(serial_t *obj)
 357 {
 358     int status;
 359     UartHandle.Instance = (USART_TypeDef *)(obj->uart);
 360     // Check if data is received
 361     status = ((__HAL_UART_GET_FLAG(&UartHandle, UART_FLAG_RXNE) != RESET) ? 1 : 0);
 362     return status;
 363 }
 364
 365 int serial_writable(serial_t *obj)
 366 {
 367     int status;
 368     UartHandle.Instance = (USART_TypeDef *)(obj->uart);
 369     // Check if data is transmitted
 370     status = ((__HAL_UART_GET_FLAG(&UartHandle, UART_FLAG_TXE) != RESET) ? 1 : 0);
 371     return status;
 372 }
 373
 374 void serial_clear(serial_t *obj)
 375 {
 376     UartHandle.Instance = (USART_TypeDef *)(obj->uart);
 377     __HAL_UART_CLEAR_FLAG(&UartHandle, UART_FLAG_TXE);
 378     __HAL_UART_CLEAR_FLAG(&UartHandle, UART_FLAG_RXNE);
 379 }
 380
 381 void serial_pinout_tx(PinName tx)
 382 {
 383     pinmap_pinout(tx, PinMap_UART_TX);
 384 }
 385
 386 void serial_break_set(serial_t *obj)
 387 {
 388     UartHandle.Instance = (USART_TypeDef *)(obj->uart);
 389     HAL_LIN_SendBreak(&UartHandle);
 390 }
 391
 392 void serial_break_clear(serial_t *obj)
 393 {
 394 }
 395
 396 #endif