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/*
ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS/RT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file ARMCM3/nvic.c
* @brief Cortex-M3 NVIC support code.
* @addtogroup ARMCM3_NVIC
* @{
*/
#include "ch.h"
#include "nvic.h"
/**
* @brief Sets the priority of an interrupt handler and enables it.
*
* @param n the interrupt number
* @param prio the interrupt priority
*
* @note The parameters are not tested for correctness.
*/
void NVICEnableVector(uint32_t n, uint32_t prio) {
unsigned sh = (n & 3) << 3;
NVIC_IPR(n >> 2) = (NVIC_IPR(n >> 2) & ~(0xFF << sh)) | (prio << sh);
NVIC_ICPR(n >> 5) = 1 << (n & 0x1F);
NVIC_ISER(n >> 5) = 1 << (n & 0x1F);
}
/**
* @brief Disables an interrupt handler.
*
* @param n the interrupt number
*
* @note The parameters are not tested for correctness.
*/
void NVICDisableVector(uint32_t n) {
unsigned sh = (n & 3) << 3;
NVIC_ICER(n >> 5) = 1 << (n & 0x1F);
NVIC_IPR(n >> 2) = NVIC_IPR(n >> 2) & ~(0xFF << sh);
}
/**
* @brief Changes the priority of a system handler.
*
* @param handler the system handler number
* @param prio the system handler priority
* @note The parameters are not tested for correctness.
*/
void NVICSetSystemHandlerPriority(uint32_t handler, uint32_t prio) {
unsigned sh = (handler & 3) * 8;
SCB_SHPR(handler >> 2) = (SCB_SHPR(handler >> 2) & ~(0xFF << sh)) | (prio << sh);
}
/** @} */
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