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vendor/NXP/LPC812/cmsis/cmsis_nvic.c

Committer:
emilmont
Date:
2013-06-14
Revision:
10:3bc89ef62ce7

File content as of revision 10:3bc89ef62ce7:

/* mbed Microcontroller Library - cmsis_nvic for LPC11U24
 * Copyright (c) 2011 ARM Limited. All rights reserved.
 *
 * CMSIS-style functionality to support dynamic vectors
 */ 
#include "cmsis_nvic.h"

#define NVIC_NUM_VECTORS (16 + 32)            // CORE + MCU Peripherals
#define NVIC_RAM_VECTOR_ADDRESS (0x10000000)  // Vectors positioned at start of RAM

void NVIC_SetVector(IRQn_Type IRQn, uint32_t vector) {
    static volatile uint32_t* vectors = (uint32_t*)NVIC_RAM_VECTOR_ADDRESS;
    int i;
    
    // Copy and switch to dynamic vectors if first time called
    if (SCB->VTOR != NVIC_RAM_VECTOR_ADDRESS) {
        uint32_t *old_vectors = (uint32_t*)SCB->VTOR;
        for (i=0; i<NVIC_NUM_VECTORS; i++) {
            vectors[i] = old_vectors[i];
        }
        SCB->VTOR = (uint32_t)vectors;
    }
    
    vectors[IRQn + 16] = vector;
}

uint32_t NVIC_GetVector(IRQn_Type IRQn) {
    uint32_t *vectors = (uint32_t*)SCB->VTOR;
    return vectors[IRQn + 16];
}