ChibiOS/RT Architecture - Reference Manual - Guides |
00001 /* 00002 ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio. 00003 00004 This file is part of ChibiOS/RT. 00005 00006 ChibiOS/RT is free software; you can redistribute it and/or modify 00007 it under the terms of the GNU General Public License as published by 00008 the Free Software Foundation; either version 3 of the License, or 00009 (at your option) any later version. 00010 00011 ChibiOS/RT is distributed in the hope that it will be useful, 00012 but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 GNU General Public License for more details. 00015 00016 You should have received a copy of the GNU General Public License 00017 along with this program. If not, see <http://www.gnu.org/licenses/>. 00018 00019 --- 00020 00021 A special exception to the GPL can be applied should you wish to distribute 00022 a combined work that includes ChibiOS/RT, without being obliged to provide 00023 the source code for any proprietary components. See the file exception.txt 00024 for full details of how and when the exception can be applied. 00025 */ 00026 00027 /** 00028 * @file ARMCMx/nvic.c 00029 * @brief Cortex-Mx NVIC support code. 00030 * 00031 * @addtogroup ARMCMx_NVIC 00032 * @{ 00033 */ 00034 00035 #include "ch.h" 00036 #include "nvic.h" 00037 00038 /** 00039 * @brief Sets the priority of an interrupt handler and enables it. 00040 * 00041 * @param n the interrupt number 00042 * @param prio the interrupt priority mask 00043 * 00044 * @note The parameters are not tested for correctness. 00045 */ 00046 void NVICEnableVector(uint32_t n, uint32_t prio) { 00047 unsigned sh = (n & 3) << 3; 00048 00049 NVIC_IPR(n >> 2) = (NVIC_IPR(n >> 2) & ~(0xFF << sh)) | (prio << sh); 00050 NVIC_ICPR(n >> 5) = 1 << (n & 0x1F); 00051 NVIC_ISER(n >> 5) = 1 << (n & 0x1F); 00052 } 00053 00054 /** 00055 * @brief Disables an interrupt handler. 00056 * 00057 * @param n the interrupt number 00058 * 00059 * @note The parameters are not tested for correctness. 00060 */ 00061 void NVICDisableVector(uint32_t n) { 00062 unsigned sh = (n & 3) << 3; 00063 00064 NVIC_ICER(n >> 5) = 1 << (n & 0x1F); 00065 NVIC_IPR(n >> 2) = NVIC_IPR(n >> 2) & ~(0xFF << sh); 00066 } 00067 00068 /** 00069 * @brief Changes the priority of a system handler. 00070 * 00071 * @param handler the system handler number 00072 * @param prio the system handler priority mask 00073 * @note The parameters are not tested for correctness. 00074 */ 00075 void NVICSetSystemHandlerPriority(uint32_t handler, uint32_t prio) { 00076 unsigned sh = (handler & 3) * 8; 00077 00078 SCB_SHPR(handler >> 2) = (SCB_SHPR(handler >> 2) & 00079 ~(0xFF << sh)) | (prio << sh); 00080 } 00081 00082 /** @} */