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