mirror of https://github.com/ARMmbed/mbed-os.git
57 lines
2.7 KiB
C
57 lines
2.7 KiB
C
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/* mbed Microcontroller Library
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* CMSIS-style functionality to support dynamic vectors
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*******************************************************************************
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* Copyright (c) 2015, STMicroelectronics
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*******************************************************************************
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*/
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#include "cmsis_nvic.h"
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#define NVIC_RAM_VECTOR_ADDRESS (0x20000000) // Vectors positioned at start of RAM
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#define NVIC_FLASH_VECTOR_ADDRESS (0x08000000) // Initial vector position in flash
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void NVIC_SetVector(IRQn_Type IRQn, uint32_t vector) {
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int i;
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// Copy and switch to dynamic vectors if first time called
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if ((SYSCFG->CFGR1 & SYSCFG_CFGR1_MEM_MODE) != SYSCFG_CFGR1_MEM_MODE) {
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uint32_t *old_vectors = (uint32_t *)NVIC_FLASH_VECTOR_ADDRESS;
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for (i = 0; i < NVIC_NUM_VECTORS; i++) {
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*((uint32_t *)(NVIC_RAM_VECTOR_ADDRESS + (i*4))) = old_vectors[i];
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}
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SYSCFG->CFGR1 |= SYSCFG_CFGR1_MEM_MODE; // Embedded SRAM mapped at 0x00000000
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}
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// Set the vector
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*((uint32_t *)(NVIC_RAM_VECTOR_ADDRESS + (IRQn*4) + (NVIC_USER_IRQ_OFFSET*4))) = vector;
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}
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uint32_t NVIC_GetVector(IRQn_Type IRQn) {
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uint32_t *vectors = (uint32_t*)NVIC_RAM_VECTOR_ADDRESS;
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// Return the vector
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return vectors[IRQn + 16];
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}
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