mbed library sources
Dependents: frdm_kl05z_gpio_test
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Diff: targets/cmsis/TARGET_NXP/TARGET_LPC43XX/cmsis_nvic.c
- Revision:
- 20:4263a77256ae
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/cmsis/TARGET_NXP/TARGET_LPC43XX/cmsis_nvic.c Tue Sep 10 15:14:19 2013 +0300 @@ -0,0 +1,36 @@ +/* mbed Microcontroller Library - cmsis_nvic for LCP43xx + * 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 + +// The LPC43xx can boot from multiple memories (internal Flash, external NOR, +// external SPIFI) so we don't know the initial value of VTOR. Thus we use +// a variable to keep track if the vector table was relocated or not +static unsigned char vtor_relocated; + +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 first time called + if (!vtor_relocated) { + 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; + vtor_relocated = 1; + } + vectors[IRQn + 16] = vector; +} + +uint32_t NVIC_GetVector(IRQn_Type IRQn) { + uint32_t *vectors = (uint32_t*)SCB->VTOR; + return vectors[IRQn + 16]; +} +