1 /* mbed Microcontroller Library
2 * CMSIS-style functionality to support dynamic vectors
3 *******************************************************************************
4 * Copyright (c) 2014, STMicroelectronics
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
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.
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 *******************************************************************************
31 #include "cmsis_nvic.h"
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
36 int NVIC_vtor_remap = 0; // To keep track that the vectors remap is done
38 void NVIC_SetVector(IRQn_Type IRQn, uint32_t vector) {
40 // Space for dynamic vectors, initialised to allocate in R/W
41 uint32_t *vectors = (uint32_t *)NVIC_RAM_VECTOR_ADDRESS;
43 // Copy and switch to dynamic vectors if first time called
44 if (NVIC_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];
49 SYSCFG->CFGR1 |= 0x03; // Embedded SRAM mapped at 0x00000000
50 NVIC_vtor_remap = 1; // The vectors remap is done
54 vectors[IRQn + 16] = vector;
57 uint32_t NVIC_GetVector(IRQn_Type IRQn) {
58 uint32_t *vectors = (uint32_t*)NVIC_RAM_VECTOR_ADDRESS;
60 return vectors[IRQn + 16];