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];