76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file ARMCMx/nvic.c
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* @brief Cortex-Mx NVIC support code.
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*
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* @addtogroup ARMCMx_NVIC
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* @{
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*/
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#include "ch.h"
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#include "nvic.h"
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/**
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* @brief Sets the priority of an interrupt handler and enables it.
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*
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* @param n the interrupt number
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* @param prio the interrupt priority mask
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*
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* @note The parameters are not tested for correctness.
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*/
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void NVICEnableVector(uint32_t n, uint32_t prio) {
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unsigned sh = (n & 3) << 3;
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NVIC_IPR(n >> 2) = (NVIC_IPR(n >> 2) & ~(0xFF << sh)) | (prio << sh);
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NVIC_ICPR(n >> 5) = 1 << (n & 0x1F);
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NVIC_ISER(n >> 5) = 1 << (n & 0x1F);
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}
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/**
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* @brief Disables an interrupt handler.
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*
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* @param n the interrupt number
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*
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* @note The parameters are not tested for correctness.
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*/
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void NVICDisableVector(uint32_t n) {
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unsigned sh = (n & 3) << 3;
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NVIC_ICER(n >> 5) = 1 << (n & 0x1F);
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NVIC_IPR(n >> 2) = NVIC_IPR(n >> 2) & ~(0xFF << sh);
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}
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/**
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* @brief Changes the priority of a system handler.
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*
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* @param handler the system handler number
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* @param prio the system handler priority mask
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* @note The parameters are not tested for correctness.
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*/
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void NVICSetSystemHandlerPriority(uint32_t handler, uint32_t prio) {
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unsigned sh = (handler & 3) * 8;
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SCB_SHPR(handler >> 2) = (SCB_SHPR(handler >> 2) &
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~(0xFF << sh)) | (prio << sh);
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}
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/** @} */
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