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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 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 common/ARMCMx/nvic.c
* @brief Cortex-Mx NVIC support code.
*
* @addtogroup COMMON_ARMCMx_NVIC
* @{
*/
#include "ch.h"
#include "nvic.h"
/**
* @brief Sets the priority of an interrupt handler and enables it.
* @note The parameters are not tested for correctness.
*
* @param[in] n the interrupt number
* @param[in] prio the interrupt priority mask
*/
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.
* @note The parameters are not tested for correctness.
*
* @param[in] n the interrupt number
*/
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.
* @note The parameters are not tested for correctness.
*
* @param[in] handler the system handler number
* @param[in] prio the system handler priority mask
*/
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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