tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32F0/TARGET_DISCO_F051R8/cmsis_nvic.c

   1 /* mbed Microcontroller Library
   2  * CMSIS-style functionality to support dynamic vectors
   3  *******************************************************************************
   4  * Copyright (c) 2014, STMicroelectronics
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright notice,
  11  *    this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright notice,
  13  *    this list of conditions and the following disclaimer in the documentation
  14  *    and/or other materials provided with the distribution.
  15  * 3. Neither the name of STMicroelectronics nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  20  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  25  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  26  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  *******************************************************************************
  30  */
  31 #include "cmsis_nvic.h"
  32
  33 #define NVIC_RAM_VECTOR_ADDRESS   (0x20000000)  // Vectors positioned at start of RAM
  34 #define NVIC_FLASH_VECTOR_ADDRESS (0x08000000)  // Initial vector position in flash
  35
  36 static unsigned char vtor_remap = 0; // To keep track that the vectors remap is done
  37
  38 void NVIC_SetVector(IRQn_Type IRQn, uint32_t vector) {
  39     int i;
  40     // Space for dynamic vectors, initialised to allocate in R/W
  41     static volatile uint32_t *vectors = (uint32_t *)NVIC_RAM_VECTOR_ADDRESS;
  42
  43     // Copy and switch to dynamic vectors if first time called
  44     if (vtor_remap == 0) {
  45       uint32_t *old_vectors = (uint32_t *)NVIC_FLASH_VECTOR_ADDRESS;
  46       for (i = 0; i < NVIC_NUM_VECTORS; i++) {
  47           vectors[i] = old_vectors[i];
  48       }
  49       SYSCFG->CFGR1 |= 0x03; // Embedded SRAM mapped at 0x00000000
  50       vtor_remap = 1; // The vectors remap is done
  51     }
  52
  53     // Set the vector
  54     vectors[IRQn + 16] = vector;
  55 }
  56
  57 uint32_t NVIC_GetVector(IRQn_Type IRQn) {
  58     uint32_t *vectors = (uint32_t*)NVIC_RAM_VECTOR_ADDRESS;
  59     // Return the vector
  60     return vectors[IRQn + 16];
  61 }