1 /* mbed Microcontroller Library
2 * CMSIS-style functionality to support dynamic vectors
3 *******************************************************************************
4 * Copyright (c) 2011 ARM Limited. All rights reserved.
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 ARM Limited 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 (0x1FFFE000) // Vectors positioned at start of RAM
34 #define NVIC_FLASH_VECTOR_ADDRESS (0x1000) // Initial vector position in flash
36 void NVIC_SetVector(IRQn_Type IRQn
, uint32_t vector
) {
37 uint32_t *vectors
= (uint32_t*)SCB
->VTOR
;
40 // Copy and switch to dynamic vectors if the first time called
41 if (SCB
->VTOR
== NVIC_FLASH_VECTOR_ADDRESS
) {
42 uint32_t *old_vectors
= vectors
;
43 vectors
= (uint32_t*)NVIC_RAM_VECTOR_ADDRESS
;
44 for (i
=0; i
<NVIC_NUM_VECTORS
; i
++) {
45 vectors
[i
] = old_vectors
[i
];
47 SCB
->VTOR
= (uint32_t)NVIC_RAM_VECTOR_ADDRESS
;
49 vectors
[IRQn
+ 16] = vector
;
52 uint32_t NVIC_GetVector(IRQn_Type IRQn
) {
53 uint32_t *vectors
= (uint32_t*)SCB
->VTOR
;
54 return vectors
[IRQn
+ 16];