mirror of https://github.com/ARMmbed/mbed-os.git
44 lines
1.5 KiB
C
44 lines
1.5 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2015-2016 ARM Limited
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* CMSIS-style functionality to support dynamic vectors
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*/
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#include "cmsis_nvic.h"
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#define NVIC_RAM_VECTOR_ADDRESS (0x20000000) //Location of vectors in RAM
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#define NVIC_FLASH_VECTOR_ADDRESS (0x00000000) //Initial vector position in flash
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void __NVIC_SetVector(IRQn_Type IRQn, uint32_t vector) {
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uint32_t *vectors = (uint32_t*)SCB->VTOR;
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uint32_t i;
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// Copy and switch to dynamic vectors if the first time called
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if (SCB->VTOR == NVIC_FLASH_VECTOR_ADDRESS) {
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uint32_t *old_vectors = vectors;
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vectors = (uint32_t*)NVIC_RAM_VECTOR_ADDRESS;
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for (i=0; i<NVIC_NUM_VECTORS; i++) {
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vectors[i] = old_vectors[i];
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}
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SCB->VTOR = (uint32_t)NVIC_RAM_VECTOR_ADDRESS;
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}
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vectors[IRQn + NVIC_USER_IRQ_OFFSET] = 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*)SCB->VTOR;
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return vectors[IRQn + NVIC_USER_IRQ_OFFSET];
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}
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