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targets/cmsis/TARGET_NXP/TARGET_LPC13XX/cmsis_nvic.c

Committer:
mbed_official
Date:
2014-02-11
Revision:
89:9655231f5786
Parent:
15:4892fe388435

File content as of revision 89:9655231f5786:

/* mbed Microcontroller Library - cmsis_nvic for LCP1768
 * Copyright (c) 2009-2011 ARM Limited. All rights reserved.
 *
 * CMSIS-style functionality to support dynamic vectors
 */ 
#include "cmsis_nvic.h"

#define NVIC_RAM_VECTOR_ADDRESS   (0x10000000)  // Location of vectors in RAM
#define NVIC_FLASH_VECTOR_ADDRESS (0x0)       // Initial vector position in flash

void NVIC_SetVector(IRQn_Type IRQn, uint32_t vector) {
    uint32_t *vectors = (uint32_t*)SCB->VTOR;
    uint32_t i;

    // Copy and switch to dynamic vectors if the first time called
    if (SCB->VTOR == NVIC_FLASH_VECTOR_ADDRESS) {
        uint32_t *old_vectors = vectors;
        vectors = (uint32_t*)NVIC_RAM_VECTOR_ADDRESS;
        for (i=0; i<NVIC_NUM_VECTORS; i++) {
            vectors[i] = old_vectors[i];
        }
        SCB->VTOR = (uint32_t)NVIC_RAM_VECTOR_ADDRESS;
    }
    vectors[IRQn + 16] = vector;
}

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